*/
#include <drm/drm_vma_manager.h>
-#include <drm/drm_pci.h>
#include <drm/i915_drm.h>
#include <linux/dma-fence-array.h>
#include <linux/kthread.h>
#include <linux/dma-buf.h>
#include <linux/mman.h>
+#include "display/intel_display.h"
+#include "display/intel_frontbuffer.h"
+
+#include "gem/i915_gem_clflush.h"
+#include "gem/i915_gem_context.h"
+#include "gem/i915_gem_ioctls.h"
+#include "gem/i915_gem_pm.h"
+#include "gem/i915_gemfs.h"
#include "gt/intel_engine_pm.h"
#include "gt/intel_gt_pm.h"
#include "gt/intel_mocs.h"
#include "gt/intel_workarounds.h"
#include "i915_drv.h"
-#include "i915_gem_clflush.h"
-#include "i915_gemfs.h"
-#include "i915_gem_pm.h"
+#include "i915_scatterlist.h"
#include "i915_trace.h"
#include "i915_vgpu.h"
-#include "intel_display.h"
#include "intel_drv.h"
-#include "intel_frontbuffer.h"
#include "intel_pm.h"
-static void i915_gem_flush_free_objects(struct drm_i915_private *i915);
-
-static bool cpu_write_needs_clflush(struct drm_i915_gem_object *obj)
-{
- if (obj->cache_dirty)
- return false;
-
- if (!(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE))
- return true;
-
- return obj->pin_global; /* currently in use by HW, keep flushed */
-}
-
static int
insert_mappable_node(struct i915_ggtt *ggtt,
struct drm_mm_node *node, u32 size)
drm_mm_remove_node(node);
}
-/* some bookkeeping */
-static void i915_gem_info_add_obj(struct drm_i915_private *dev_priv,
- u64 size)
-{
- spin_lock(&dev_priv->mm.object_stat_lock);
- dev_priv->mm.object_count++;
- dev_priv->mm.object_memory += size;
- spin_unlock(&dev_priv->mm.object_stat_lock);
-}
-
-static void i915_gem_info_remove_obj(struct drm_i915_private *dev_priv,
- u64 size)
-{
- spin_lock(&dev_priv->mm.object_stat_lock);
- dev_priv->mm.object_count--;
- dev_priv->mm.object_memory -= size;
- spin_unlock(&dev_priv->mm.object_stat_lock);
-}
-
int
i915_gem_get_aperture_ioctl(struct drm_device *dev, void *data,
struct drm_file *file)
return 0;
}
-static int i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj)
-{
- struct address_space *mapping = obj->base.filp->f_mapping;
- drm_dma_handle_t *phys;
- struct sg_table *st;
- struct scatterlist *sg;
- char *vaddr;
- int i;
- int err;
-
- if (WARN_ON(i915_gem_object_needs_bit17_swizzle(obj)))
- return -EINVAL;
-
- /* Always aligning to the object size, allows a single allocation
- * to handle all possible callers, and given typical object sizes,
- * the alignment of the buddy allocation will naturally match.
- */
- phys = drm_pci_alloc(obj->base.dev,
- roundup_pow_of_two(obj->base.size),
- roundup_pow_of_two(obj->base.size));
- if (!phys)
- return -ENOMEM;
-
- vaddr = phys->vaddr;
- for (i = 0; i < obj->base.size / PAGE_SIZE; i++) {
- struct page *page;
- char *src;
-
- page = shmem_read_mapping_page(mapping, i);
- if (IS_ERR(page)) {
- err = PTR_ERR(page);
- goto err_phys;
- }
-
- src = kmap_atomic(page);
- memcpy(vaddr, src, PAGE_SIZE);
- drm_clflush_virt_range(vaddr, PAGE_SIZE);
- kunmap_atomic(src);
-
- put_page(page);
- vaddr += PAGE_SIZE;
- }
-
- i915_gem_chipset_flush(to_i915(obj->base.dev));
-
- st = kmalloc(sizeof(*st), GFP_KERNEL);
- if (!st) {
- err = -ENOMEM;
- goto err_phys;
- }
-
- if (sg_alloc_table(st, 1, GFP_KERNEL)) {
- kfree(st);
- err = -ENOMEM;
- goto err_phys;
- }
-
- sg = st->sgl;
- sg->offset = 0;
- sg->length = obj->base.size;
-
- sg_dma_address(sg) = phys->busaddr;
- sg_dma_len(sg) = obj->base.size;
-
- obj->phys_handle = phys;
-
- __i915_gem_object_set_pages(obj, st, sg->length);
-
- return 0;
-
-err_phys:
- drm_pci_free(obj->base.dev, phys);
-
- return err;
-}
-
-static void __start_cpu_write(struct drm_i915_gem_object *obj)
-{
- obj->read_domains = I915_GEM_DOMAIN_CPU;
- obj->write_domain = I915_GEM_DOMAIN_CPU;
- if (cpu_write_needs_clflush(obj))
- obj->cache_dirty = true;
-}
-
-void
-__i915_gem_object_release_shmem(struct drm_i915_gem_object *obj,
- struct sg_table *pages,
- bool needs_clflush)
-{
- GEM_BUG_ON(obj->mm.madv == __I915_MADV_PURGED);
-
- if (obj->mm.madv == I915_MADV_DONTNEED)
- obj->mm.dirty = false;
-
- if (needs_clflush &&
- (obj->read_domains & I915_GEM_DOMAIN_CPU) == 0 &&
- !(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_READ))
- drm_clflush_sg(pages);
-
- __start_cpu_write(obj);
-}
-
-static void
-i915_gem_object_put_pages_phys(struct drm_i915_gem_object *obj,
- struct sg_table *pages)
-{
- __i915_gem_object_release_shmem(obj, pages, false);
-
- if (obj->mm.dirty) {
- struct address_space *mapping = obj->base.filp->f_mapping;
- char *vaddr = obj->phys_handle->vaddr;
- int i;
-
- for (i = 0; i < obj->base.size / PAGE_SIZE; i++) {
- struct page *page;
- char *dst;
-
- page = shmem_read_mapping_page(mapping, i);
- if (IS_ERR(page))
- continue;
-
- dst = kmap_atomic(page);
- drm_clflush_virt_range(vaddr, PAGE_SIZE);
- memcpy(dst, vaddr, PAGE_SIZE);
- kunmap_atomic(dst);
-
- set_page_dirty(page);
- if (obj->mm.madv == I915_MADV_WILLNEED)
- mark_page_accessed(page);
- put_page(page);
- vaddr += PAGE_SIZE;
- }
- obj->mm.dirty = false;
- }
-
- sg_free_table(pages);
- kfree(pages);
-
- drm_pci_free(obj->base.dev, obj->phys_handle);
-}
-
-static void
-i915_gem_object_release_phys(struct drm_i915_gem_object *obj)
-{
- i915_gem_object_unpin_pages(obj);
-}
-
-static const struct drm_i915_gem_object_ops i915_gem_phys_ops = {
- .get_pages = i915_gem_object_get_pages_phys,
- .put_pages = i915_gem_object_put_pages_phys,
- .release = i915_gem_object_release_phys,
-};
-
-static const struct drm_i915_gem_object_ops i915_gem_object_ops;
-
int i915_gem_object_unbind(struct drm_i915_gem_object *obj)
{
struct i915_vma *vma;
LIST_HEAD(still_in_list);
- int ret;
+ int ret = 0;
lockdep_assert_held(&obj->base.dev->struct_mutex);
- /* Closed vma are removed from the obj->vma_list - but they may
- * still have an active binding on the object. To remove those we
- * must wait for all rendering to complete to the object (as unbinding
- * must anyway), and retire the requests.
- */
- ret = i915_gem_object_set_to_cpu_domain(obj, false);
- if (ret)
- return ret;
-
spin_lock(&obj->vma.lock);
while (!ret && (vma = list_first_entry_or_null(&obj->vma.list,
struct i915_vma,
return ret;
}
-static long
-i915_gem_object_wait_fence(struct dma_fence *fence,
- unsigned int flags,
- long timeout)
-{
- struct i915_request *rq;
-
- BUILD_BUG_ON(I915_WAIT_INTERRUPTIBLE != 0x1);
-
- if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags))
- return timeout;
-
- if (!dma_fence_is_i915(fence))
- return dma_fence_wait_timeout(fence,
- flags & I915_WAIT_INTERRUPTIBLE,
- timeout);
-
- rq = to_request(fence);
- if (i915_request_completed(rq))
- goto out;
-
- timeout = i915_request_wait(rq, flags, timeout);
-
-out:
- if (flags & I915_WAIT_LOCKED && i915_request_completed(rq))
- i915_request_retire_upto(rq);
-
- return timeout;
-}
-
-static long
-i915_gem_object_wait_reservation(struct reservation_object *resv,
- unsigned int flags,
- long timeout)
-{
- unsigned int seq = __read_seqcount_begin(&resv->seq);
- struct dma_fence *excl;
- bool prune_fences = false;
-
- if (flags & I915_WAIT_ALL) {
- struct dma_fence **shared;
- unsigned int count, i;
- int ret;
-
- ret = reservation_object_get_fences_rcu(resv,
- &excl, &count, &shared);
- if (ret)
- return ret;
-
- for (i = 0; i < count; i++) {
- timeout = i915_gem_object_wait_fence(shared[i],
- flags, timeout);
- if (timeout < 0)
- break;
-
- dma_fence_put(shared[i]);
- }
-
- for (; i < count; i++)
- dma_fence_put(shared[i]);
- kfree(shared);
-
- /*
- * If both shared fences and an exclusive fence exist,
- * then by construction the shared fences must be later
- * than the exclusive fence. If we successfully wait for
- * all the shared fences, we know that the exclusive fence
- * must all be signaled. If all the shared fences are
- * signaled, we can prune the array and recover the
- * floating references on the fences/requests.
- */
- prune_fences = count && timeout >= 0;
- } else {
- excl = reservation_object_get_excl_rcu(resv);
- }
-
- if (excl && timeout >= 0)
- timeout = i915_gem_object_wait_fence(excl, flags, timeout);
-
- dma_fence_put(excl);
-
- /*
- * Opportunistically prune the fences iff we know they have *all* been
- * signaled and that the reservation object has not been changed (i.e.
- * no new fences have been added).
- */
- if (prune_fences && !__read_seqcount_retry(&resv->seq, seq)) {
- if (reservation_object_trylock(resv)) {
- if (!__read_seqcount_retry(&resv->seq, seq))
- reservation_object_add_excl_fence(resv, NULL);
- reservation_object_unlock(resv);
- }
- }
-
- return timeout;
-}
-
-static void __fence_set_priority(struct dma_fence *fence,
- const struct i915_sched_attr *attr)
-{
- struct i915_request *rq;
- struct intel_engine_cs *engine;
-
- if (dma_fence_is_signaled(fence) || !dma_fence_is_i915(fence))
- return;
-
- rq = to_request(fence);
- engine = rq->engine;
-
- local_bh_disable();
- rcu_read_lock(); /* RCU serialisation for set-wedged protection */
- if (engine->schedule)
- engine->schedule(rq, attr);
- rcu_read_unlock();
- local_bh_enable(); /* kick the tasklets if queues were reprioritised */
-}
-
-static void fence_set_priority(struct dma_fence *fence,
- const struct i915_sched_attr *attr)
-{
- /* Recurse once into a fence-array */
- if (dma_fence_is_array(fence)) {
- struct dma_fence_array *array = to_dma_fence_array(fence);
- int i;
-
- for (i = 0; i < array->num_fences; i++)
- __fence_set_priority(array->fences[i], attr);
- } else {
- __fence_set_priority(fence, attr);
- }
-}
-
-int
-i915_gem_object_wait_priority(struct drm_i915_gem_object *obj,
- unsigned int flags,
- const struct i915_sched_attr *attr)
-{
- struct dma_fence *excl;
-
- if (flags & I915_WAIT_ALL) {
- struct dma_fence **shared;
- unsigned int count, i;
- int ret;
-
- ret = reservation_object_get_fences_rcu(obj->resv,
- &excl, &count, &shared);
- if (ret)
- return ret;
-
- for (i = 0; i < count; i++) {
- fence_set_priority(shared[i], attr);
- dma_fence_put(shared[i]);
- }
-
- kfree(shared);
- } else {
- excl = reservation_object_get_excl_rcu(obj->resv);
- }
-
- if (excl) {
- fence_set_priority(excl, attr);
- dma_fence_put(excl);
- }
- return 0;
-}
-
-/**
- * Waits for rendering to the object to be completed
- * @obj: i915 gem object
- * @flags: how to wait (under a lock, for all rendering or just for writes etc)
- * @timeout: how long to wait
- */
-int
-i915_gem_object_wait(struct drm_i915_gem_object *obj,
- unsigned int flags,
- long timeout)
-{
- might_sleep();
- GEM_BUG_ON(timeout < 0);
-
- timeout = i915_gem_object_wait_reservation(obj->resv, flags, timeout);
- return timeout < 0 ? timeout : 0;
-}
-
static int
i915_gem_phys_pwrite(struct drm_i915_gem_object *obj,
struct drm_i915_gem_pwrite *args,
return -EINVAL;
/* Allocate the new object */
- obj = i915_gem_object_create(dev_priv, size);
+ obj = i915_gem_object_create_shmem(dev_priv, size);
if (IS_ERR(obj))
return PTR_ERR(obj);
&args->size, &args->handle);
}
-static bool gpu_write_needs_clflush(struct drm_i915_gem_object *obj)
-{
- return !(obj->cache_level == I915_CACHE_NONE ||
- obj->cache_level == I915_CACHE_WT);
-}
-
/**
* Creates a new mm object and returns a handle to it.
* @dev: drm device pointer
&args->size, &args->handle);
}
-static inline enum fb_op_origin
-fb_write_origin(struct drm_i915_gem_object *obj, unsigned int domain)
-{
- return (domain == I915_GEM_DOMAIN_GTT ?
- obj->frontbuffer_ggtt_origin : ORIGIN_CPU);
-}
-
void i915_gem_flush_ggtt_writes(struct drm_i915_private *dev_priv)
{
intel_wakeref_t wakeref;
i915_gem_chipset_flush(dev_priv);
- with_intel_runtime_pm(dev_priv, wakeref) {
- spin_lock_irq(&dev_priv->uncore.lock);
-
- POSTING_READ_FW(RING_HEAD(RENDER_RING_BASE));
-
- spin_unlock_irq(&dev_priv->uncore.lock);
- }
-}
-
-static void
-flush_write_domain(struct drm_i915_gem_object *obj, unsigned int flush_domains)
-{
- struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
- struct i915_vma *vma;
-
- if (!(obj->write_domain & flush_domains))
- return;
-
- switch (obj->write_domain) {
- case I915_GEM_DOMAIN_GTT:
- i915_gem_flush_ggtt_writes(dev_priv);
-
- intel_fb_obj_flush(obj,
- fb_write_origin(obj, I915_GEM_DOMAIN_GTT));
-
- for_each_ggtt_vma(vma, obj) {
- if (vma->iomap)
- continue;
-
- i915_vma_unset_ggtt_write(vma);
- }
- break;
-
- case I915_GEM_DOMAIN_WC:
- wmb();
- break;
-
- case I915_GEM_DOMAIN_CPU:
- i915_gem_clflush_object(obj, I915_CLFLUSH_SYNC);
- break;
-
- case I915_GEM_DOMAIN_RENDER:
- if (gpu_write_needs_clflush(obj))
- obj->cache_dirty = true;
- break;
- }
-
- obj->write_domain = 0;
-}
-
-/*
- * Pins the specified object's pages and synchronizes the object with
- * GPU accesses. Sets needs_clflush to non-zero if the caller should
- * flush the object from the CPU cache.
- */
-int i915_gem_obj_prepare_shmem_read(struct drm_i915_gem_object *obj,
- unsigned int *needs_clflush)
-{
- int ret;
-
- lockdep_assert_held(&obj->base.dev->struct_mutex);
-
- *needs_clflush = 0;
- if (!i915_gem_object_has_struct_page(obj))
- return -ENODEV;
+ with_intel_runtime_pm(&dev_priv->runtime_pm, wakeref) {
+ struct intel_uncore *uncore = &dev_priv->uncore;
- ret = i915_gem_object_wait(obj,
- I915_WAIT_INTERRUPTIBLE |
- I915_WAIT_LOCKED,
- MAX_SCHEDULE_TIMEOUT);
- if (ret)
- return ret;
-
- ret = i915_gem_object_pin_pages(obj);
- if (ret)
- return ret;
-
- if (obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_READ ||
- !static_cpu_has(X86_FEATURE_CLFLUSH)) {
- ret = i915_gem_object_set_to_cpu_domain(obj, false);
- if (ret)
- goto err_unpin;
- else
- goto out;
- }
-
- flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
-
- /* If we're not in the cpu read domain, set ourself into the gtt
- * read domain and manually flush cachelines (if required). This
- * optimizes for the case when the gpu will dirty the data
- * anyway again before the next pread happens.
- */
- if (!obj->cache_dirty &&
- !(obj->read_domains & I915_GEM_DOMAIN_CPU))
- *needs_clflush = CLFLUSH_BEFORE;
-
-out:
- /* return with the pages pinned */
- return 0;
-
-err_unpin:
- i915_gem_object_unpin_pages(obj);
- return ret;
-}
-
-int i915_gem_obj_prepare_shmem_write(struct drm_i915_gem_object *obj,
- unsigned int *needs_clflush)
-{
- int ret;
-
- lockdep_assert_held(&obj->base.dev->struct_mutex);
-
- *needs_clflush = 0;
- if (!i915_gem_object_has_struct_page(obj))
- return -ENODEV;
-
- ret = i915_gem_object_wait(obj,
- I915_WAIT_INTERRUPTIBLE |
- I915_WAIT_LOCKED |
- I915_WAIT_ALL,
- MAX_SCHEDULE_TIMEOUT);
- if (ret)
- return ret;
-
- ret = i915_gem_object_pin_pages(obj);
- if (ret)
- return ret;
-
- if (obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE ||
- !static_cpu_has(X86_FEATURE_CLFLUSH)) {
- ret = i915_gem_object_set_to_cpu_domain(obj, true);
- if (ret)
- goto err_unpin;
- else
- goto out;
- }
-
- flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
-
- /* If we're not in the cpu write domain, set ourself into the
- * gtt write domain and manually flush cachelines (as required).
- * This optimizes for the case when the gpu will use the data
- * right away and we therefore have to clflush anyway.
- */
- if (!obj->cache_dirty) {
- *needs_clflush |= CLFLUSH_AFTER;
-
- /*
- * Same trick applies to invalidate partially written
- * cachelines read before writing.
- */
- if (!(obj->read_domains & I915_GEM_DOMAIN_CPU))
- *needs_clflush |= CLFLUSH_BEFORE;
+ spin_lock_irq(&uncore->lock);
+ intel_uncore_posting_read_fw(uncore,
+ RING_HEAD(RENDER_RING_BASE));
+ spin_unlock_irq(&uncore->lock);
}
-
-out:
- intel_fb_obj_invalidate(obj, ORIGIN_CPU);
- obj->mm.dirty = true;
- /* return with the pages pinned */
- return 0;
-
-err_unpin:
- i915_gem_object_unpin_pages(obj);
- return ret;
}
static int
i915_gem_shmem_pread(struct drm_i915_gem_object *obj,
struct drm_i915_gem_pread *args)
{
- char __user *user_data;
- u64 remain;
unsigned int needs_clflush;
unsigned int idx, offset;
+ struct dma_fence *fence;
+ char __user *user_data;
+ u64 remain;
int ret;
- ret = mutex_lock_interruptible(&obj->base.dev->struct_mutex);
- if (ret)
- return ret;
-
- ret = i915_gem_obj_prepare_shmem_read(obj, &needs_clflush);
- mutex_unlock(&obj->base.dev->struct_mutex);
+ ret = i915_gem_object_prepare_read(obj, &needs_clflush);
if (ret)
return ret;
+ fence = i915_gem_object_lock_fence(obj);
+ i915_gem_object_finish_access(obj);
+ if (!fence)
+ return -ENOMEM;
+
remain = args->size;
user_data = u64_to_user_ptr(args->data_ptr);
offset = offset_in_page(args->offset);
offset = 0;
}
- i915_gem_obj_finish_shmem_access(obj);
+ i915_gem_object_unlock_fence(obj, fence);
return ret;
}
struct i915_ggtt *ggtt = &i915->ggtt;
intel_wakeref_t wakeref;
struct drm_mm_node node;
- struct i915_vma *vma;
+ struct dma_fence *fence;
void __user *user_data;
+ struct i915_vma *vma;
u64 remain, offset;
int ret;
if (ret)
return ret;
- wakeref = intel_runtime_pm_get(i915);
+ wakeref = intel_runtime_pm_get(&i915->runtime_pm);
vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
PIN_MAPPABLE |
PIN_NONFAULT |
GEM_BUG_ON(!node.allocated);
}
- ret = i915_gem_object_set_to_gtt_domain(obj, false);
+ mutex_unlock(&i915->drm.struct_mutex);
+
+ ret = i915_gem_object_lock_interruptible(obj);
if (ret)
goto out_unpin;
- mutex_unlock(&i915->drm.struct_mutex);
+ ret = i915_gem_object_set_to_gtt_domain(obj, false);
+ if (ret) {
+ i915_gem_object_unlock(obj);
+ goto out_unpin;
+ }
+
+ fence = i915_gem_object_lock_fence(obj);
+ i915_gem_object_unlock(obj);
+ if (!fence) {
+ ret = -ENOMEM;
+ goto out_unpin;
+ }
user_data = u64_to_user_ptr(args->data_ptr);
remain = args->size;
offset += page_length;
}
- mutex_lock(&i915->drm.struct_mutex);
+ i915_gem_object_unlock_fence(obj, fence);
out_unpin:
+ mutex_lock(&i915->drm.struct_mutex);
if (node.allocated) {
wmb();
ggtt->vm.clear_range(&ggtt->vm, node.start, node.size);
i915_vma_unpin(vma);
}
out_unlock:
- intel_runtime_pm_put(i915, wakeref);
+ intel_runtime_pm_put(&i915->runtime_pm, wakeref);
mutex_unlock(&i915->drm.struct_mutex);
return ret;
{
struct drm_i915_private *i915 = to_i915(obj->base.dev);
struct i915_ggtt *ggtt = &i915->ggtt;
+ struct intel_runtime_pm *rpm = &i915->runtime_pm;
intel_wakeref_t wakeref;
struct drm_mm_node node;
+ struct dma_fence *fence;
struct i915_vma *vma;
u64 remain, offset;
void __user *user_data;
* This easily dwarfs any performance advantage from
* using the cache bypass of indirect GGTT access.
*/
- wakeref = intel_runtime_pm_get_if_in_use(i915);
+ wakeref = intel_runtime_pm_get_if_in_use(rpm);
if (!wakeref) {
ret = -EFAULT;
goto out_unlock;
}
} else {
/* No backing pages, no fallback, we must force GGTT access */
- wakeref = intel_runtime_pm_get(i915);
+ wakeref = intel_runtime_pm_get(rpm);
}
vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
GEM_BUG_ON(!node.allocated);
}
- ret = i915_gem_object_set_to_gtt_domain(obj, true);
+ mutex_unlock(&i915->drm.struct_mutex);
+
+ ret = i915_gem_object_lock_interruptible(obj);
if (ret)
goto out_unpin;
- mutex_unlock(&i915->drm.struct_mutex);
+ ret = i915_gem_object_set_to_gtt_domain(obj, true);
+ if (ret) {
+ i915_gem_object_unlock(obj);
+ goto out_unpin;
+ }
+
+ fence = i915_gem_object_lock_fence(obj);
+ i915_gem_object_unlock(obj);
+ if (!fence) {
+ ret = -ENOMEM;
+ goto out_unpin;
+ }
intel_fb_obj_invalidate(obj, ORIGIN_CPU);
}
intel_fb_obj_flush(obj, ORIGIN_CPU);
- mutex_lock(&i915->drm.struct_mutex);
+ i915_gem_object_unlock_fence(obj, fence);
out_unpin:
+ mutex_lock(&i915->drm.struct_mutex);
if (node.allocated) {
wmb();
ggtt->vm.clear_range(&ggtt->vm, node.start, node.size);
i915_vma_unpin(vma);
}
out_rpm:
- intel_runtime_pm_put(i915, wakeref);
+ intel_runtime_pm_put(rpm, wakeref);
out_unlock:
mutex_unlock(&i915->drm.struct_mutex);
return ret;
i915_gem_shmem_pwrite(struct drm_i915_gem_object *obj,
const struct drm_i915_gem_pwrite *args)
{
- struct drm_i915_private *i915 = to_i915(obj->base.dev);
- void __user *user_data;
- u64 remain;
unsigned int partial_cacheline_write;
unsigned int needs_clflush;
unsigned int offset, idx;
+ struct dma_fence *fence;
+ void __user *user_data;
+ u64 remain;
int ret;
- ret = mutex_lock_interruptible(&i915->drm.struct_mutex);
+ ret = i915_gem_object_prepare_write(obj, &needs_clflush);
if (ret)
return ret;
- ret = i915_gem_obj_prepare_shmem_write(obj, &needs_clflush);
- mutex_unlock(&i915->drm.struct_mutex);
- if (ret)
- return ret;
+ fence = i915_gem_object_lock_fence(obj);
+ i915_gem_object_finish_access(obj);
+ if (!fence)
+ return -ENOMEM;
/* If we don't overwrite a cacheline completely we need to be
* careful to have up-to-date data by first clflushing. Don't
}
intel_fb_obj_flush(obj, ORIGIN_CPU);
- i915_gem_obj_finish_shmem_access(obj);
+ i915_gem_object_unlock_fence(obj, fence);
+
return ret;
}
return ret;
}
-static void i915_gem_object_bump_inactive_ggtt(struct drm_i915_gem_object *obj)
-{
- struct drm_i915_private *i915 = to_i915(obj->base.dev);
- struct list_head *list;
- struct i915_vma *vma;
-
- GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj));
-
- mutex_lock(&i915->ggtt.vm.mutex);
- for_each_ggtt_vma(vma, obj) {
- if (!drm_mm_node_allocated(&vma->node))
- continue;
-
- list_move_tail(&vma->vm_link, &vma->vm->bound_list);
- }
- mutex_unlock(&i915->ggtt.vm.mutex);
-
- spin_lock(&i915->mm.obj_lock);
- list = obj->bind_count ? &i915->mm.bound_list : &i915->mm.unbound_list;
- list_move_tail(&obj->mm.link, list);
- spin_unlock(&i915->mm.obj_lock);
-}
-
-/**
- * Called when user space prepares to use an object with the CPU, either
- * through the mmap ioctl's mapping or a GTT mapping.
- * @dev: drm device
- * @data: ioctl data blob
- * @file: drm file
- */
-int
-i915_gem_set_domain_ioctl(struct drm_device *dev, void *data,
- struct drm_file *file)
-{
- struct drm_i915_gem_set_domain *args = data;
- struct drm_i915_gem_object *obj;
- u32 read_domains = args->read_domains;
- u32 write_domain = args->write_domain;
- int err;
-
- /* Only handle setting domains to types used by the CPU. */
- if ((write_domain | read_domains) & I915_GEM_GPU_DOMAINS)
- return -EINVAL;
-
- /*
- * Having something in the write domain implies it's in the read
- * domain, and only that read domain. Enforce that in the request.
- */
- if (write_domain && read_domains != write_domain)
- return -EINVAL;
-
- if (!read_domains)
- return 0;
-
- obj = i915_gem_object_lookup(file, args->handle);
- if (!obj)
- return -ENOENT;
-
- /*
- * Already in the desired write domain? Nothing for us to do!
- *
- * We apply a little bit of cunning here to catch a broader set of
- * no-ops. If obj->write_domain is set, we must be in the same
- * obj->read_domains, and only that domain. Therefore, if that
- * obj->write_domain matches the request read_domains, we are
- * already in the same read/write domain and can skip the operation,
- * without having to further check the requested write_domain.
- */
- if (READ_ONCE(obj->write_domain) == read_domains) {
- err = 0;
- goto out;
- }
-
- /*
- * Try to flush the object off the GPU without holding the lock.
- * We will repeat the flush holding the lock in the normal manner
- * to catch cases where we are gazumped.
- */
- err = i915_gem_object_wait(obj,
- I915_WAIT_INTERRUPTIBLE |
- I915_WAIT_PRIORITY |
- (write_domain ? I915_WAIT_ALL : 0),
- MAX_SCHEDULE_TIMEOUT);
- if (err)
- goto out;
-
- /*
- * Proxy objects do not control access to the backing storage, ergo
- * they cannot be used as a means to manipulate the cache domain
- * tracking for that backing storage. The proxy object is always
- * considered to be outside of any cache domain.
- */
- if (i915_gem_object_is_proxy(obj)) {
- err = -ENXIO;
- goto out;
- }
-
- /*
- * Flush and acquire obj->pages so that we are coherent through
- * direct access in memory with previous cached writes through
- * shmemfs and that our cache domain tracking remains valid.
- * For example, if the obj->filp was moved to swap without us
- * being notified and releasing the pages, we would mistakenly
- * continue to assume that the obj remained out of the CPU cached
- * domain.
- */
- err = i915_gem_object_pin_pages(obj);
- if (err)
- goto out;
-
- err = i915_mutex_lock_interruptible(dev);
- if (err)
- goto out_unpin;
-
- if (read_domains & I915_GEM_DOMAIN_WC)
- err = i915_gem_object_set_to_wc_domain(obj, write_domain);
- else if (read_domains & I915_GEM_DOMAIN_GTT)
- err = i915_gem_object_set_to_gtt_domain(obj, write_domain);
- else
- err = i915_gem_object_set_to_cpu_domain(obj, write_domain);
-
- /* And bump the LRU for this access */
- i915_gem_object_bump_inactive_ggtt(obj);
-
- mutex_unlock(&dev->struct_mutex);
-
- if (write_domain != 0)
- intel_fb_obj_invalidate(obj,
- fb_write_origin(obj, write_domain));
-
-out_unpin:
- i915_gem_object_unpin_pages(obj);
-out:
- i915_gem_object_put(obj);
- return err;
-}
-
/**
* Called when user space has done writes to this buffer
* @dev: drm device
return 0;
}
-static inline bool
-__vma_matches(struct vm_area_struct *vma, struct file *filp,
- unsigned long addr, unsigned long size)
+void i915_gem_runtime_suspend(struct drm_i915_private *i915)
{
- if (vma->vm_file != filp)
- return false;
+ struct drm_i915_gem_object *obj, *on;
+ int i;
- return vma->vm_start == addr &&
- (vma->vm_end - vma->vm_start) == PAGE_ALIGN(size);
-}
+ /*
+ * Only called during RPM suspend. All users of the userfault_list
+ * must be holding an RPM wakeref to ensure that this can not
+ * run concurrently with themselves (and use the struct_mutex for
+ * protection between themselves).
+ */
-/**
- * i915_gem_mmap_ioctl - Maps the contents of an object, returning the address
- * it is mapped to.
- * @dev: drm device
- * @data: ioctl data blob
- * @file: drm file
- *
- * While the mapping holds a reference on the contents of the object, it doesn't
- * imply a ref on the object itself.
- *
- * IMPORTANT:
- *
- * DRM driver writers who look a this function as an example for how to do GEM
- * mmap support, please don't implement mmap support like here. The modern way
- * to implement DRM mmap support is with an mmap offset ioctl (like
- * i915_gem_mmap_gtt) and then using the mmap syscall on the DRM fd directly.
- * That way debug tooling like valgrind will understand what's going on, hiding
- * the mmap call in a driver private ioctl will break that. The i915 driver only
- * does cpu mmaps this way because we didn't know better.
- */
-int
-i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
- struct drm_file *file)
-{
- struct drm_i915_gem_mmap *args = data;
- struct drm_i915_gem_object *obj;
- unsigned long addr;
+ list_for_each_entry_safe(obj, on,
+ &i915->ggtt.userfault_list, userfault_link)
+ __i915_gem_object_release_mmap(obj);
- if (args->flags & ~(I915_MMAP_WC))
- return -EINVAL;
+ /*
+ * The fence will be lost when the device powers down. If any were
+ * in use by hardware (i.e. they are pinned), we should not be powering
+ * down! All other fences will be reacquired by the user upon waking.
+ */
+ for (i = 0; i < i915->ggtt.num_fences; i++) {
+ struct i915_fence_reg *reg = &i915->ggtt.fence_regs[i];
- if (args->flags & I915_MMAP_WC && !boot_cpu_has(X86_FEATURE_PAT))
- return -ENODEV;
+ /*
+ * Ideally we want to assert that the fence register is not
+ * live at this point (i.e. that no piece of code will be
+ * trying to write through fence + GTT, as that both violates
+ * our tracking of activity and associated locking/barriers,
+ * but also is illegal given that the hw is powered down).
+ *
+ * Previously we used reg->pin_count as a "liveness" indicator.
+ * That is not sufficient, and we need a more fine-grained
+ * tool if we want to have a sanity check here.
+ */
- obj = i915_gem_object_lookup(file, args->handle);
- if (!obj)
- return -ENOENT;
+ if (!reg->vma)
+ continue;
- /* prime objects have no backing filp to GEM mmap
- * pages from.
- */
- if (!obj->base.filp) {
- addr = -ENXIO;
- goto err;
+ GEM_BUG_ON(i915_vma_has_userfault(reg->vma));
+ reg->dirty = true;
}
+}
- if (range_overflows(args->offset, args->size, (u64)obj->base.size)) {
- addr = -EINVAL;
- goto err;
+static int wait_for_engines(struct drm_i915_private *i915)
+{
+ if (wait_for(intel_engines_are_idle(i915), I915_IDLE_ENGINES_TIMEOUT)) {
+ dev_err(i915->drm.dev,
+ "Failed to idle engines, declaring wedged!\n");
+ GEM_TRACE_DUMP();
+ i915_gem_set_wedged(i915);
+ return -EIO;
}
- addr = vm_mmap(obj->base.filp, 0, args->size,
- PROT_READ | PROT_WRITE, MAP_SHARED,
- args->offset);
- if (IS_ERR_VALUE(addr))
- goto err;
+ return 0;
+}
- if (args->flags & I915_MMAP_WC) {
- struct mm_struct *mm = current->mm;
- struct vm_area_struct *vma;
+static long
+wait_for_timelines(struct drm_i915_private *i915,
+ unsigned int flags, long timeout)
+{
+ struct i915_gt_timelines *gt = &i915->gt.timelines;
+ struct i915_timeline *tl;
- if (down_write_killable(&mm->mmap_sem)) {
- addr = -EINTR;
- goto err;
- }
- vma = find_vma(mm, addr);
- if (vma && __vma_matches(vma, obj->base.filp, addr, args->size))
- vma->vm_page_prot =
- pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
- else
- addr = -ENOMEM;
- up_write(&mm->mmap_sem);
- if (IS_ERR_VALUE(addr))
- goto err;
+ mutex_lock(>->mutex);
+ list_for_each_entry(tl, >->active_list, link) {
+ struct i915_request *rq;
- /* This may race, but that's ok, it only gets set */
- WRITE_ONCE(obj->frontbuffer_ggtt_origin, ORIGIN_CPU);
- }
- i915_gem_object_put(obj);
+ rq = i915_active_request_get_unlocked(&tl->last_request);
+ if (!rq)
+ continue;
- args->addr_ptr = (u64)addr;
- return 0;
+ mutex_unlock(>->mutex);
-err:
- i915_gem_object_put(obj);
- return addr;
-}
+ /*
+ * "Race-to-idle".
+ *
+ * Switching to the kernel context is often used a synchronous
+ * step prior to idling, e.g. in suspend for flushing all
+ * current operations to memory before sleeping. These we
+ * want to complete as quickly as possible to avoid prolonged
+ * stalls, so allow the gpu to boost to maximum clocks.
+ */
+ if (flags & I915_WAIT_FOR_IDLE_BOOST)
+ gen6_rps_boost(rq);
-static unsigned int tile_row_pages(const struct drm_i915_gem_object *obj)
-{
- return i915_gem_object_get_tile_row_size(obj) >> PAGE_SHIFT;
-}
+ timeout = i915_request_wait(rq, flags, timeout);
+ i915_request_put(rq);
+ if (timeout < 0)
+ return timeout;
-/**
- * i915_gem_mmap_gtt_version - report the current feature set for GTT mmaps
- *
- * A history of the GTT mmap interface:
- *
- * 0 - Everything had to fit into the GTT. Both parties of a memcpy had to
- * aligned and suitable for fencing, and still fit into the available
- * mappable space left by the pinned display objects. A classic problem
- * we called the page-fault-of-doom where we would ping-pong between
- * two objects that could not fit inside the GTT and so the memcpy
- * would page one object in at the expense of the other between every
- * single byte.
- *
- * 1 - Objects can be any size, and have any compatible fencing (X Y, or none
- * as set via i915_gem_set_tiling() [DRM_I915_GEM_SET_TILING]). If the
- * object is too large for the available space (or simply too large
- * for the mappable aperture!), a view is created instead and faulted
- * into userspace. (This view is aligned and sized appropriately for
- * fenced access.)
- *
- * 2 - Recognise WC as a separate cache domain so that we can flush the
- * delayed writes via GTT before performing direct access via WC.
- *
- * 3 - Remove implicit set-domain(GTT) and synchronisation on initial
- * pagefault; swapin remains transparent.
- *
- * Restrictions:
- *
- * * snoopable objects cannot be accessed via the GTT. It can cause machine
- * hangs on some architectures, corruption on others. An attempt to service
- * a GTT page fault from a snoopable object will generate a SIGBUS.
- *
- * * the object must be able to fit into RAM (physical memory, though no
- * limited to the mappable aperture).
- *
- *
- * Caveats:
- *
- * * a new GTT page fault will synchronize rendering from the GPU and flush
- * all data to system memory. Subsequent access will not be synchronized.
- *
- * * all mappings are revoked on runtime device suspend.
- *
- * * there are only 8, 16 or 32 fence registers to share between all users
- * (older machines require fence register for display and blitter access
- * as well). Contention of the fence registers will cause the previous users
- * to be unmapped and any new access will generate new page faults.
- *
- * * running out of memory while servicing a fault may generate a SIGBUS,
- * rather than the expected SIGSEGV.
- */
-int i915_gem_mmap_gtt_version(void)
-{
- return 3;
+ /* restart after reacquiring the lock */
+ mutex_lock(>->mutex);
+ tl = list_entry(>->active_list, typeof(*tl), link);
+ }
+ mutex_unlock(>->mutex);
+
+ return timeout;
}
-static inline struct i915_ggtt_view
-compute_partial_view(const struct drm_i915_gem_object *obj,
- pgoff_t page_offset,
- unsigned int chunk)
+int i915_gem_wait_for_idle(struct drm_i915_private *i915,
+ unsigned int flags, long timeout)
{
- struct i915_ggtt_view view;
+ GEM_TRACE("flags=%x (%s), timeout=%ld%s, awake?=%s\n",
+ flags, flags & I915_WAIT_LOCKED ? "locked" : "unlocked",
+ timeout, timeout == MAX_SCHEDULE_TIMEOUT ? " (forever)" : "",
+ yesno(i915->gt.awake));
- if (i915_gem_object_is_tiled(obj))
- chunk = roundup(chunk, tile_row_pages(obj));
+ /* If the device is asleep, we have no requests outstanding */
+ if (!READ_ONCE(i915->gt.awake))
+ return 0;
- view.type = I915_GGTT_VIEW_PARTIAL;
- view.partial.offset = rounddown(page_offset, chunk);
- view.partial.size =
- min_t(unsigned int, chunk,
- (obj->base.size >> PAGE_SHIFT) - view.partial.offset);
+ timeout = wait_for_timelines(i915, flags, timeout);
+ if (timeout < 0)
+ return timeout;
- /* If the partial covers the entire object, just create a normal VMA. */
- if (chunk >= obj->base.size >> PAGE_SHIFT)
- view.type = I915_GGTT_VIEW_NORMAL;
+ if (flags & I915_WAIT_LOCKED) {
+ int err;
- return view;
-}
+ lockdep_assert_held(&i915->drm.struct_mutex);
-/**
- * i915_gem_fault - fault a page into the GTT
- * @vmf: fault info
- *
- * The fault handler is set up by drm_gem_mmap() when a object is GTT mapped
- * from userspace. The fault handler takes care of binding the object to
- * the GTT (if needed), allocating and programming a fence register (again,
- * only if needed based on whether the old reg is still valid or the object
- * is tiled) and inserting a new PTE into the faulting process.
- *
- * Note that the faulting process may involve evicting existing objects
- * from the GTT and/or fence registers to make room. So performance may
- * suffer if the GTT working set is large or there are few fence registers
- * left.
- *
- * The current feature set supported by i915_gem_fault() and thus GTT mmaps
- * is exposed via I915_PARAM_MMAP_GTT_VERSION (see i915_gem_mmap_gtt_version).
- */
-vm_fault_t i915_gem_fault(struct vm_fault *vmf)
-{
-#define MIN_CHUNK_PAGES (SZ_1M >> PAGE_SHIFT)
- struct vm_area_struct *area = vmf->vma;
- struct drm_i915_gem_object *obj = to_intel_bo(area->vm_private_data);
- struct drm_device *dev = obj->base.dev;
- struct drm_i915_private *dev_priv = to_i915(dev);
- struct i915_ggtt *ggtt = &dev_priv->ggtt;
- bool write = area->vm_flags & VM_WRITE;
- intel_wakeref_t wakeref;
- struct i915_vma *vma;
- pgoff_t page_offset;
- int srcu;
- int ret;
-
- /* Sanity check that we allow writing into this object */
- if (i915_gem_object_is_readonly(obj) && write)
- return VM_FAULT_SIGBUS;
-
- /* We don't use vmf->pgoff since that has the fake offset */
- page_offset = (vmf->address - area->vm_start) >> PAGE_SHIFT;
-
- trace_i915_gem_object_fault(obj, page_offset, true, write);
-
- ret = i915_gem_object_pin_pages(obj);
- if (ret)
- goto err;
-
- wakeref = intel_runtime_pm_get(dev_priv);
-
- srcu = i915_reset_trylock(dev_priv);
- if (srcu < 0) {
- ret = srcu;
- goto err_rpm;
- }
-
- ret = i915_mutex_lock_interruptible(dev);
- if (ret)
- goto err_reset;
-
- /* Access to snoopable pages through the GTT is incoherent. */
- if (obj->cache_level != I915_CACHE_NONE && !HAS_LLC(dev_priv)) {
- ret = -EFAULT;
- goto err_unlock;
- }
-
- /* Now pin it into the GTT as needed */
- vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
- PIN_MAPPABLE |
- PIN_NONBLOCK |
- PIN_NONFAULT);
- if (IS_ERR(vma)) {
- /* Use a partial view if it is bigger than available space */
- struct i915_ggtt_view view =
- compute_partial_view(obj, page_offset, MIN_CHUNK_PAGES);
- unsigned int flags;
-
- flags = PIN_MAPPABLE;
- if (view.type == I915_GGTT_VIEW_NORMAL)
- flags |= PIN_NONBLOCK; /* avoid warnings for pinned */
-
- /*
- * Userspace is now writing through an untracked VMA, abandon
- * all hope that the hardware is able to track future writes.
- */
- obj->frontbuffer_ggtt_origin = ORIGIN_CPU;
-
- vma = i915_gem_object_ggtt_pin(obj, &view, 0, 0, flags);
- if (IS_ERR(vma) && !view.type) {
- flags = PIN_MAPPABLE;
- view.type = I915_GGTT_VIEW_PARTIAL;
- vma = i915_gem_object_ggtt_pin(obj, &view, 0, 0, flags);
- }
- }
- if (IS_ERR(vma)) {
- ret = PTR_ERR(vma);
- goto err_unlock;
- }
-
- ret = i915_vma_pin_fence(vma);
- if (ret)
- goto err_unpin;
-
- /* Finally, remap it using the new GTT offset */
- ret = remap_io_mapping(area,
- area->vm_start + (vma->ggtt_view.partial.offset << PAGE_SHIFT),
- (ggtt->gmadr.start + vma->node.start) >> PAGE_SHIFT,
- min_t(u64, vma->size, area->vm_end - area->vm_start),
- &ggtt->iomap);
- if (ret)
- goto err_fence;
-
- /* Mark as being mmapped into userspace for later revocation */
- assert_rpm_wakelock_held(dev_priv);
- if (!i915_vma_set_userfault(vma) && !obj->userfault_count++)
- list_add(&obj->userfault_link, &dev_priv->mm.userfault_list);
- if (CONFIG_DRM_I915_USERFAULT_AUTOSUSPEND)
- intel_wakeref_auto(&dev_priv->mm.userfault_wakeref,
- msecs_to_jiffies_timeout(CONFIG_DRM_I915_USERFAULT_AUTOSUSPEND));
- GEM_BUG_ON(!obj->userfault_count);
-
- i915_vma_set_ggtt_write(vma);
-
-err_fence:
- i915_vma_unpin_fence(vma);
-err_unpin:
- __i915_vma_unpin(vma);
-err_unlock:
- mutex_unlock(&dev->struct_mutex);
-err_reset:
- i915_reset_unlock(dev_priv, srcu);
-err_rpm:
- intel_runtime_pm_put(dev_priv, wakeref);
- i915_gem_object_unpin_pages(obj);
-err:
- switch (ret) {
- case -EIO:
- /*
- * We eat errors when the gpu is terminally wedged to avoid
- * userspace unduly crashing (gl has no provisions for mmaps to
- * fail). But any other -EIO isn't ours (e.g. swap in failure)
- * and so needs to be reported.
- */
- if (!i915_terminally_wedged(dev_priv))
- return VM_FAULT_SIGBUS;
- /* else: fall through */
- case -EAGAIN:
- /*
- * EAGAIN means the gpu is hung and we'll wait for the error
- * handler to reset everything when re-faulting in
- * i915_mutex_lock_interruptible.
- */
- case 0:
- case -ERESTARTSYS:
- case -EINTR:
- case -EBUSY:
- /*
- * EBUSY is ok: this just means that another thread
- * already did the job.
- */
- return VM_FAULT_NOPAGE;
- case -ENOMEM:
- return VM_FAULT_OOM;
- case -ENOSPC:
- case -EFAULT:
- return VM_FAULT_SIGBUS;
- default:
- WARN_ONCE(ret, "unhandled error in i915_gem_fault: %i\n", ret);
- return VM_FAULT_SIGBUS;
- }
-}
-
-static void __i915_gem_object_release_mmap(struct drm_i915_gem_object *obj)
-{
- struct i915_vma *vma;
-
- GEM_BUG_ON(!obj->userfault_count);
-
- obj->userfault_count = 0;
- list_del(&obj->userfault_link);
- drm_vma_node_unmap(&obj->base.vma_node,
- obj->base.dev->anon_inode->i_mapping);
-
- for_each_ggtt_vma(vma, obj)
- i915_vma_unset_userfault(vma);
-}
-
-/**
- * i915_gem_release_mmap - remove physical page mappings
- * @obj: obj in question
- *
- * Preserve the reservation of the mmapping with the DRM core code, but
- * relinquish ownership of the pages back to the system.
- *
- * It is vital that we remove the page mapping if we have mapped a tiled
- * object through the GTT and then lose the fence register due to
- * resource pressure. Similarly if the object has been moved out of the
- * aperture, than pages mapped into userspace must be revoked. Removing the
- * mapping will then trigger a page fault on the next user access, allowing
- * fixup by i915_gem_fault().
- */
-void
-i915_gem_release_mmap(struct drm_i915_gem_object *obj)
-{
- struct drm_i915_private *i915 = to_i915(obj->base.dev);
- intel_wakeref_t wakeref;
-
- /* Serialisation between user GTT access and our code depends upon
- * revoking the CPU's PTE whilst the mutex is held. The next user
- * pagefault then has to wait until we release the mutex.
- *
- * Note that RPM complicates somewhat by adding an additional
- * requirement that operations to the GGTT be made holding the RPM
- * wakeref.
- */
- lockdep_assert_held(&i915->drm.struct_mutex);
- wakeref = intel_runtime_pm_get(i915);
-
- if (!obj->userfault_count)
- goto out;
-
- __i915_gem_object_release_mmap(obj);
-
- /* Ensure that the CPU's PTE are revoked and there are not outstanding
- * memory transactions from userspace before we return. The TLB
- * flushing implied above by changing the PTE above *should* be
- * sufficient, an extra barrier here just provides us with a bit
- * of paranoid documentation about our requirement to serialise
- * memory writes before touching registers / GSM.
- */
- wmb();
-
-out:
- intel_runtime_pm_put(i915, wakeref);
-}
-
-void i915_gem_runtime_suspend(struct drm_i915_private *dev_priv)
-{
- struct drm_i915_gem_object *obj, *on;
- int i;
-
- /*
- * Only called during RPM suspend. All users of the userfault_list
- * must be holding an RPM wakeref to ensure that this can not
- * run concurrently with themselves (and use the struct_mutex for
- * protection between themselves).
- */
-
- list_for_each_entry_safe(obj, on,
- &dev_priv->mm.userfault_list, userfault_link)
- __i915_gem_object_release_mmap(obj);
-
- /* The fence will be lost when the device powers down. If any were
- * in use by hardware (i.e. they are pinned), we should not be powering
- * down! All other fences will be reacquired by the user upon waking.
- */
- for (i = 0; i < dev_priv->num_fence_regs; i++) {
- struct drm_i915_fence_reg *reg = &dev_priv->fence_regs[i];
-
- /* Ideally we want to assert that the fence register is not
- * live at this point (i.e. that no piece of code will be
- * trying to write through fence + GTT, as that both violates
- * our tracking of activity and associated locking/barriers,
- * but also is illegal given that the hw is powered down).
- *
- * Previously we used reg->pin_count as a "liveness" indicator.
- * That is not sufficient, and we need a more fine-grained
- * tool if we want to have a sanity check here.
- */
-
- if (!reg->vma)
- continue;
-
- GEM_BUG_ON(i915_vma_has_userfault(reg->vma));
- reg->dirty = true;
- }
-}
-
-static int i915_gem_object_create_mmap_offset(struct drm_i915_gem_object *obj)
-{
- struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
- int err;
-
- err = drm_gem_create_mmap_offset(&obj->base);
- if (likely(!err))
- return 0;
-
- /* Attempt to reap some mmap space from dead objects */
- do {
- err = i915_gem_wait_for_idle(dev_priv,
- I915_WAIT_INTERRUPTIBLE,
- MAX_SCHEDULE_TIMEOUT);
- if (err)
- break;
-
- i915_gem_drain_freed_objects(dev_priv);
- err = drm_gem_create_mmap_offset(&obj->base);
- if (!err)
- break;
-
- } while (flush_delayed_work(&dev_priv->gem.retire_work));
-
- return err;
-}
-
-static void i915_gem_object_free_mmap_offset(struct drm_i915_gem_object *obj)
-{
- drm_gem_free_mmap_offset(&obj->base);
-}
-
-int
-i915_gem_mmap_gtt(struct drm_file *file,
- struct drm_device *dev,
- u32 handle,
- u64 *offset)
-{
- struct drm_i915_gem_object *obj;
- int ret;
-
- obj = i915_gem_object_lookup(file, handle);
- if (!obj)
- return -ENOENT;
-
- ret = i915_gem_object_create_mmap_offset(obj);
- if (ret == 0)
- *offset = drm_vma_node_offset_addr(&obj->base.vma_node);
-
- i915_gem_object_put(obj);
- return ret;
-}
-
-/**
- * i915_gem_mmap_gtt_ioctl - prepare an object for GTT mmap'ing
- * @dev: DRM device
- * @data: GTT mapping ioctl data
- * @file: GEM object info
- *
- * Simply returns the fake offset to userspace so it can mmap it.
- * The mmap call will end up in drm_gem_mmap(), which will set things
- * up so we can get faults in the handler above.
- *
- * The fault handler will take care of binding the object into the GTT
- * (since it may have been evicted to make room for something), allocating
- * a fence register, and mapping the appropriate aperture address into
- * userspace.
- */
-int
-i915_gem_mmap_gtt_ioctl(struct drm_device *dev, void *data,
- struct drm_file *file)
-{
- struct drm_i915_gem_mmap_gtt *args = data;
-
- return i915_gem_mmap_gtt(file, dev, args->handle, &args->offset);
-}
-
-/* Immediately discard the backing storage */
-void __i915_gem_object_truncate(struct drm_i915_gem_object *obj)
-{
- i915_gem_object_free_mmap_offset(obj);
-
- if (obj->base.filp == NULL)
- return;
-
- /* Our goal here is to return as much of the memory as
- * is possible back to the system as we are called from OOM.
- * To do this we must instruct the shmfs to drop all of its
- * backing pages, *now*.
- */
- shmem_truncate_range(file_inode(obj->base.filp), 0, (loff_t)-1);
- obj->mm.madv = __I915_MADV_PURGED;
- obj->mm.pages = ERR_PTR(-EFAULT);
-}
-
-/*
- * Move pages to appropriate lru and release the pagevec, decrementing the
- * ref count of those pages.
- */
-static void check_release_pagevec(struct pagevec *pvec)
-{
- check_move_unevictable_pages(pvec);
- __pagevec_release(pvec);
- cond_resched();
-}
-
-static void
-i915_gem_object_put_pages_gtt(struct drm_i915_gem_object *obj,
- struct sg_table *pages)
-{
- struct sgt_iter sgt_iter;
- struct pagevec pvec;
- struct page *page;
-
- __i915_gem_object_release_shmem(obj, pages, true);
- i915_gem_gtt_finish_pages(obj, pages);
-
- if (i915_gem_object_needs_bit17_swizzle(obj))
- i915_gem_object_save_bit_17_swizzle(obj, pages);
-
- mapping_clear_unevictable(file_inode(obj->base.filp)->i_mapping);
-
- pagevec_init(&pvec);
- for_each_sgt_page(page, sgt_iter, pages) {
- if (obj->mm.dirty)
- set_page_dirty(page);
-
- if (obj->mm.madv == I915_MADV_WILLNEED)
- mark_page_accessed(page);
-
- if (!pagevec_add(&pvec, page))
- check_release_pagevec(&pvec);
- }
- if (pagevec_count(&pvec))
- check_release_pagevec(&pvec);
- obj->mm.dirty = false;
-
- sg_free_table(pages);
- kfree(pages);
-}
-
-static void __i915_gem_object_reset_page_iter(struct drm_i915_gem_object *obj)
-{
- struct radix_tree_iter iter;
- void __rcu **slot;
-
- rcu_read_lock();
- radix_tree_for_each_slot(slot, &obj->mm.get_page.radix, &iter, 0)
- radix_tree_delete(&obj->mm.get_page.radix, iter.index);
- rcu_read_unlock();
-}
-
-static struct sg_table *
-__i915_gem_object_unset_pages(struct drm_i915_gem_object *obj)
-{
- struct drm_i915_private *i915 = to_i915(obj->base.dev);
- struct sg_table *pages;
-
- pages = fetch_and_zero(&obj->mm.pages);
- if (IS_ERR_OR_NULL(pages))
- return pages;
-
- spin_lock(&i915->mm.obj_lock);
- list_del(&obj->mm.link);
- spin_unlock(&i915->mm.obj_lock);
-
- if (obj->mm.mapping) {
- void *ptr;
-
- ptr = page_mask_bits(obj->mm.mapping);
- if (is_vmalloc_addr(ptr))
- vunmap(ptr);
- else
- kunmap(kmap_to_page(ptr));
-
- obj->mm.mapping = NULL;
- }
-
- __i915_gem_object_reset_page_iter(obj);
- obj->mm.page_sizes.phys = obj->mm.page_sizes.sg = 0;
-
- return pages;
-}
-
-int __i915_gem_object_put_pages(struct drm_i915_gem_object *obj,
- enum i915_mm_subclass subclass)
-{
- struct sg_table *pages;
- int ret;
-
- if (i915_gem_object_has_pinned_pages(obj))
- return -EBUSY;
-
- GEM_BUG_ON(obj->bind_count);
-
- /* May be called by shrinker from within get_pages() (on another bo) */
- mutex_lock_nested(&obj->mm.lock, subclass);
- if (unlikely(atomic_read(&obj->mm.pages_pin_count))) {
- ret = -EBUSY;
- goto unlock;
- }
-
- /*
- * ->put_pages might need to allocate memory for the bit17 swizzle
- * array, hence protect them from being reaped by removing them from gtt
- * lists early.
- */
- pages = __i915_gem_object_unset_pages(obj);
-
- /*
- * XXX Temporary hijinx to avoid updating all backends to handle
- * NULL pages. In the future, when we have more asynchronous
- * get_pages backends we should be better able to handle the
- * cancellation of the async task in a more uniform manner.
- */
- if (!pages && !i915_gem_object_needs_async_cancel(obj))
- pages = ERR_PTR(-EINVAL);
-
- if (!IS_ERR(pages))
- obj->ops->put_pages(obj, pages);
-
- ret = 0;
-unlock:
- mutex_unlock(&obj->mm.lock);
-
- return ret;
-}
-
-bool i915_sg_trim(struct sg_table *orig_st)
-{
- struct sg_table new_st;
- struct scatterlist *sg, *new_sg;
- unsigned int i;
-
- if (orig_st->nents == orig_st->orig_nents)
- return false;
-
- if (sg_alloc_table(&new_st, orig_st->nents, GFP_KERNEL | __GFP_NOWARN))
- return false;
-
- new_sg = new_st.sgl;
- for_each_sg(orig_st->sgl, sg, orig_st->nents, i) {
- sg_set_page(new_sg, sg_page(sg), sg->length, 0);
- sg_dma_address(new_sg) = sg_dma_address(sg);
- sg_dma_len(new_sg) = sg_dma_len(sg);
-
- new_sg = sg_next(new_sg);
- }
- GEM_BUG_ON(new_sg); /* Should walk exactly nents and hit the end */
-
- sg_free_table(orig_st);
-
- *orig_st = new_st;
- return true;
-}
-
-static int i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
-{
- struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
- const unsigned long page_count = obj->base.size / PAGE_SIZE;
- unsigned long i;
- struct address_space *mapping;
- struct sg_table *st;
- struct scatterlist *sg;
- struct sgt_iter sgt_iter;
- struct page *page;
- unsigned long last_pfn = 0; /* suppress gcc warning */
- unsigned int max_segment = i915_sg_segment_size();
- unsigned int sg_page_sizes;
- struct pagevec pvec;
- gfp_t noreclaim;
- int ret;
-
- /*
- * Assert that the object is not currently in any GPU domain. As it
- * wasn't in the GTT, there shouldn't be any way it could have been in
- * a GPU cache
- */
- GEM_BUG_ON(obj->read_domains & I915_GEM_GPU_DOMAINS);
- GEM_BUG_ON(obj->write_domain & I915_GEM_GPU_DOMAINS);
-
- /*
- * If there's no chance of allocating enough pages for the whole
- * object, bail early.
- */
- if (page_count > totalram_pages())
- return -ENOMEM;
-
- st = kmalloc(sizeof(*st), GFP_KERNEL);
- if (st == NULL)
- return -ENOMEM;
-
-rebuild_st:
- if (sg_alloc_table(st, page_count, GFP_KERNEL)) {
- kfree(st);
- return -ENOMEM;
- }
-
- /*
- * Get the list of pages out of our struct file. They'll be pinned
- * at this point until we release them.
- *
- * Fail silently without starting the shrinker
- */
- mapping = obj->base.filp->f_mapping;
- mapping_set_unevictable(mapping);
- noreclaim = mapping_gfp_constraint(mapping, ~__GFP_RECLAIM);
- noreclaim |= __GFP_NORETRY | __GFP_NOWARN;
-
- sg = st->sgl;
- st->nents = 0;
- sg_page_sizes = 0;
- for (i = 0; i < page_count; i++) {
- const unsigned int shrink[] = {
- I915_SHRINK_BOUND | I915_SHRINK_UNBOUND | I915_SHRINK_PURGEABLE,
- 0,
- }, *s = shrink;
- gfp_t gfp = noreclaim;
-
- do {
- cond_resched();
- page = shmem_read_mapping_page_gfp(mapping, i, gfp);
- if (!IS_ERR(page))
- break;
-
- if (!*s) {
- ret = PTR_ERR(page);
- goto err_sg;
- }
-
- i915_gem_shrink(dev_priv, 2 * page_count, NULL, *s++);
-
- /*
- * We've tried hard to allocate the memory by reaping
- * our own buffer, now let the real VM do its job and
- * go down in flames if truly OOM.
- *
- * However, since graphics tend to be disposable,
- * defer the oom here by reporting the ENOMEM back
- * to userspace.
- */
- if (!*s) {
- /* reclaim and warn, but no oom */
- gfp = mapping_gfp_mask(mapping);
-
- /*
- * Our bo are always dirty and so we require
- * kswapd to reclaim our pages (direct reclaim
- * does not effectively begin pageout of our
- * buffers on its own). However, direct reclaim
- * only waits for kswapd when under allocation
- * congestion. So as a result __GFP_RECLAIM is
- * unreliable and fails to actually reclaim our
- * dirty pages -- unless you try over and over
- * again with !__GFP_NORETRY. However, we still
- * want to fail this allocation rather than
- * trigger the out-of-memory killer and for
- * this we want __GFP_RETRY_MAYFAIL.
- */
- gfp |= __GFP_RETRY_MAYFAIL;
- }
- } while (1);
-
- if (!i ||
- sg->length >= max_segment ||
- page_to_pfn(page) != last_pfn + 1) {
- if (i) {
- sg_page_sizes |= sg->length;
- sg = sg_next(sg);
- }
- st->nents++;
- sg_set_page(sg, page, PAGE_SIZE, 0);
- } else {
- sg->length += PAGE_SIZE;
- }
- last_pfn = page_to_pfn(page);
-
- /* Check that the i965g/gm workaround works. */
- WARN_ON((gfp & __GFP_DMA32) && (last_pfn >= 0x00100000UL));
- }
- if (sg) { /* loop terminated early; short sg table */
- sg_page_sizes |= sg->length;
- sg_mark_end(sg);
- }
-
- /* Trim unused sg entries to avoid wasting memory. */
- i915_sg_trim(st);
-
- ret = i915_gem_gtt_prepare_pages(obj, st);
- if (ret) {
- /*
- * DMA remapping failed? One possible cause is that
- * it could not reserve enough large entries, asking
- * for PAGE_SIZE chunks instead may be helpful.
- */
- if (max_segment > PAGE_SIZE) {
- for_each_sgt_page(page, sgt_iter, st)
- put_page(page);
- sg_free_table(st);
-
- max_segment = PAGE_SIZE;
- goto rebuild_st;
- } else {
- dev_warn(&dev_priv->drm.pdev->dev,
- "Failed to DMA remap %lu pages\n",
- page_count);
- goto err_pages;
- }
- }
-
- if (i915_gem_object_needs_bit17_swizzle(obj))
- i915_gem_object_do_bit_17_swizzle(obj, st);
-
- __i915_gem_object_set_pages(obj, st, sg_page_sizes);
-
- return 0;
-
-err_sg:
- sg_mark_end(sg);
-err_pages:
- mapping_clear_unevictable(mapping);
- pagevec_init(&pvec);
- for_each_sgt_page(page, sgt_iter, st) {
- if (!pagevec_add(&pvec, page))
- check_release_pagevec(&pvec);
- }
- if (pagevec_count(&pvec))
- check_release_pagevec(&pvec);
- sg_free_table(st);
- kfree(st);
-
- /*
- * shmemfs first checks if there is enough memory to allocate the page
- * and reports ENOSPC should there be insufficient, along with the usual
- * ENOMEM for a genuine allocation failure.
- *
- * We use ENOSPC in our driver to mean that we have run out of aperture
- * space and so want to translate the error from shmemfs back to our
- * usual understanding of ENOMEM.
- */
- if (ret == -ENOSPC)
- ret = -ENOMEM;
-
- return ret;
-}
-
-void __i915_gem_object_set_pages(struct drm_i915_gem_object *obj,
- struct sg_table *pages,
- unsigned int sg_page_sizes)
-{
- struct drm_i915_private *i915 = to_i915(obj->base.dev);
- unsigned long supported = INTEL_INFO(i915)->page_sizes;
- int i;
-
- lockdep_assert_held(&obj->mm.lock);
-
- /* Make the pages coherent with the GPU (flushing any swapin). */
- if (obj->cache_dirty) {
- obj->write_domain = 0;
- if (i915_gem_object_has_struct_page(obj))
- drm_clflush_sg(pages);
- obj->cache_dirty = false;
- }
-
- obj->mm.get_page.sg_pos = pages->sgl;
- obj->mm.get_page.sg_idx = 0;
-
- obj->mm.pages = pages;
-
- if (i915_gem_object_is_tiled(obj) &&
- i915->quirks & QUIRK_PIN_SWIZZLED_PAGES) {
- GEM_BUG_ON(obj->mm.quirked);
- __i915_gem_object_pin_pages(obj);
- obj->mm.quirked = true;
- }
-
- GEM_BUG_ON(!sg_page_sizes);
- obj->mm.page_sizes.phys = sg_page_sizes;
-
- /*
- * Calculate the supported page-sizes which fit into the given
- * sg_page_sizes. This will give us the page-sizes which we may be able
- * to use opportunistically when later inserting into the GTT. For
- * example if phys=2G, then in theory we should be able to use 1G, 2M,
- * 64K or 4K pages, although in practice this will depend on a number of
- * other factors.
- */
- obj->mm.page_sizes.sg = 0;
- for_each_set_bit(i, &supported, ilog2(I915_GTT_MAX_PAGE_SIZE) + 1) {
- if (obj->mm.page_sizes.phys & ~0u << i)
- obj->mm.page_sizes.sg |= BIT(i);
- }
- GEM_BUG_ON(!HAS_PAGE_SIZES(i915, obj->mm.page_sizes.sg));
-
- spin_lock(&i915->mm.obj_lock);
- list_add(&obj->mm.link, &i915->mm.unbound_list);
- spin_unlock(&i915->mm.obj_lock);
-}
-
-static int ____i915_gem_object_get_pages(struct drm_i915_gem_object *obj)
-{
- int err;
-
- if (unlikely(obj->mm.madv != I915_MADV_WILLNEED)) {
- DRM_DEBUG("Attempting to obtain a purgeable object\n");
- return -EFAULT;
- }
-
- err = obj->ops->get_pages(obj);
- GEM_BUG_ON(!err && !i915_gem_object_has_pages(obj));
-
- return err;
-}
-
-/* Ensure that the associated pages are gathered from the backing storage
- * and pinned into our object. i915_gem_object_pin_pages() may be called
- * multiple times before they are released by a single call to
- * i915_gem_object_unpin_pages() - once the pages are no longer referenced
- * either as a result of memory pressure (reaping pages under the shrinker)
- * or as the object is itself released.
- */
-int __i915_gem_object_get_pages(struct drm_i915_gem_object *obj)
-{
- int err;
-
- err = mutex_lock_interruptible(&obj->mm.lock);
- if (err)
- return err;
-
- if (unlikely(!i915_gem_object_has_pages(obj))) {
- GEM_BUG_ON(i915_gem_object_has_pinned_pages(obj));
-
- err = ____i915_gem_object_get_pages(obj);
- if (err)
- goto unlock;
-
- smp_mb__before_atomic();
- }
- atomic_inc(&obj->mm.pages_pin_count);
-
-unlock:
- mutex_unlock(&obj->mm.lock);
- return err;
-}
-
-/* The 'mapping' part of i915_gem_object_pin_map() below */
-static void *i915_gem_object_map(const struct drm_i915_gem_object *obj,
- enum i915_map_type type)
-{
- unsigned long n_pages = obj->base.size >> PAGE_SHIFT;
- struct sg_table *sgt = obj->mm.pages;
- struct sgt_iter sgt_iter;
- struct page *page;
- struct page *stack_pages[32];
- struct page **pages = stack_pages;
- unsigned long i = 0;
- pgprot_t pgprot;
- void *addr;
-
- /* A single page can always be kmapped */
- if (n_pages == 1 && type == I915_MAP_WB)
- return kmap(sg_page(sgt->sgl));
-
- if (n_pages > ARRAY_SIZE(stack_pages)) {
- /* Too big for stack -- allocate temporary array instead */
- pages = kvmalloc_array(n_pages, sizeof(*pages), GFP_KERNEL);
- if (!pages)
- return NULL;
- }
-
- for_each_sgt_page(page, sgt_iter, sgt)
- pages[i++] = page;
-
- /* Check that we have the expected number of pages */
- GEM_BUG_ON(i != n_pages);
-
- switch (type) {
- default:
- MISSING_CASE(type);
- /* fallthrough to use PAGE_KERNEL anyway */
- case I915_MAP_WB:
- pgprot = PAGE_KERNEL;
- break;
- case I915_MAP_WC:
- pgprot = pgprot_writecombine(PAGE_KERNEL_IO);
- break;
- }
- addr = vmap(pages, n_pages, 0, pgprot);
-
- if (pages != stack_pages)
- kvfree(pages);
-
- return addr;
-}
-
-/* get, pin, and map the pages of the object into kernel space */
-void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj,
- enum i915_map_type type)
-{
- enum i915_map_type has_type;
- bool pinned;
- void *ptr;
- int ret;
-
- if (unlikely(!i915_gem_object_has_struct_page(obj)))
- return ERR_PTR(-ENXIO);
-
- ret = mutex_lock_interruptible(&obj->mm.lock);
- if (ret)
- return ERR_PTR(ret);
-
- pinned = !(type & I915_MAP_OVERRIDE);
- type &= ~I915_MAP_OVERRIDE;
-
- if (!atomic_inc_not_zero(&obj->mm.pages_pin_count)) {
- if (unlikely(!i915_gem_object_has_pages(obj))) {
- GEM_BUG_ON(i915_gem_object_has_pinned_pages(obj));
-
- ret = ____i915_gem_object_get_pages(obj);
- if (ret)
- goto err_unlock;
-
- smp_mb__before_atomic();
- }
- atomic_inc(&obj->mm.pages_pin_count);
- pinned = false;
- }
- GEM_BUG_ON(!i915_gem_object_has_pages(obj));
-
- ptr = page_unpack_bits(obj->mm.mapping, &has_type);
- if (ptr && has_type != type) {
- if (pinned) {
- ret = -EBUSY;
- goto err_unpin;
- }
-
- if (is_vmalloc_addr(ptr))
- vunmap(ptr);
- else
- kunmap(kmap_to_page(ptr));
-
- ptr = obj->mm.mapping = NULL;
- }
-
- if (!ptr) {
- ptr = i915_gem_object_map(obj, type);
- if (!ptr) {
- ret = -ENOMEM;
- goto err_unpin;
- }
-
- obj->mm.mapping = page_pack_bits(ptr, type);
- }
-
-out_unlock:
- mutex_unlock(&obj->mm.lock);
- return ptr;
-
-err_unpin:
- atomic_dec(&obj->mm.pages_pin_count);
-err_unlock:
- ptr = ERR_PTR(ret);
- goto out_unlock;
-}
-
-void __i915_gem_object_flush_map(struct drm_i915_gem_object *obj,
- unsigned long offset,
- unsigned long size)
-{
- enum i915_map_type has_type;
- void *ptr;
-
- GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj));
- GEM_BUG_ON(range_overflows_t(typeof(obj->base.size),
- offset, size, obj->base.size));
-
- obj->mm.dirty = true;
-
- if (obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE)
- return;
-
- ptr = page_unpack_bits(obj->mm.mapping, &has_type);
- if (has_type == I915_MAP_WC)
- return;
-
- drm_clflush_virt_range(ptr + offset, size);
- if (size == obj->base.size) {
- obj->write_domain &= ~I915_GEM_DOMAIN_CPU;
- obj->cache_dirty = false;
- }
-}
-
-static int
-i915_gem_object_pwrite_gtt(struct drm_i915_gem_object *obj,
- const struct drm_i915_gem_pwrite *arg)
-{
- struct address_space *mapping = obj->base.filp->f_mapping;
- char __user *user_data = u64_to_user_ptr(arg->data_ptr);
- u64 remain, offset;
- unsigned int pg;
-
- /* Caller already validated user args */
- GEM_BUG_ON(!access_ok(user_data, arg->size));
-
- /*
- * Before we instantiate/pin the backing store for our use, we
- * can prepopulate the shmemfs filp efficiently using a write into
- * the pagecache. We avoid the penalty of instantiating all the
- * pages, important if the user is just writing to a few and never
- * uses the object on the GPU, and using a direct write into shmemfs
- * allows it to avoid the cost of retrieving a page (either swapin
- * or clearing-before-use) before it is overwritten.
- */
- if (i915_gem_object_has_pages(obj))
- return -ENODEV;
-
- if (obj->mm.madv != I915_MADV_WILLNEED)
- return -EFAULT;
-
- /*
- * Before the pages are instantiated the object is treated as being
- * in the CPU domain. The pages will be clflushed as required before
- * use, and we can freely write into the pages directly. If userspace
- * races pwrite with any other operation; corruption will ensue -
- * that is userspace's prerogative!
- */
-
- remain = arg->size;
- offset = arg->offset;
- pg = offset_in_page(offset);
-
- do {
- unsigned int len, unwritten;
- struct page *page;
- void *data, *vaddr;
- int err;
- char c;
-
- len = PAGE_SIZE - pg;
- if (len > remain)
- len = remain;
-
- /* Prefault the user page to reduce potential recursion */
- err = __get_user(c, user_data);
- if (err)
- return err;
-
- err = __get_user(c, user_data + len - 1);
- if (err)
- return err;
-
- err = pagecache_write_begin(obj->base.filp, mapping,
- offset, len, 0,
- &page, &data);
- if (err < 0)
- return err;
-
- vaddr = kmap_atomic(page);
- unwritten = __copy_from_user_inatomic(vaddr + pg,
- user_data,
- len);
- kunmap_atomic(vaddr);
-
- err = pagecache_write_end(obj->base.filp, mapping,
- offset, len, len - unwritten,
- page, data);
- if (err < 0)
- return err;
-
- /* We don't handle -EFAULT, leave it to the caller to check */
- if (unwritten)
- return -ENODEV;
-
- remain -= len;
- user_data += len;
- offset += len;
- pg = 0;
- } while (remain);
-
- return 0;
-}
-
-void i915_gem_close_object(struct drm_gem_object *gem, struct drm_file *file)
-{
- struct drm_i915_private *i915 = to_i915(gem->dev);
- struct drm_i915_gem_object *obj = to_intel_bo(gem);
- struct drm_i915_file_private *fpriv = file->driver_priv;
- struct i915_lut_handle *lut, *ln;
-
- mutex_lock(&i915->drm.struct_mutex);
-
- list_for_each_entry_safe(lut, ln, &obj->lut_list, obj_link) {
- struct i915_gem_context *ctx = lut->ctx;
- struct i915_vma *vma;
-
- GEM_BUG_ON(ctx->file_priv == ERR_PTR(-EBADF));
- if (ctx->file_priv != fpriv)
- continue;
-
- vma = radix_tree_delete(&ctx->handles_vma, lut->handle);
- GEM_BUG_ON(vma->obj != obj);
-
- /* We allow the process to have multiple handles to the same
- * vma, in the same fd namespace, by virtue of flink/open.
- */
- GEM_BUG_ON(!vma->open_count);
- if (!--vma->open_count && !i915_vma_is_ggtt(vma))
- i915_vma_close(vma);
-
- list_del(&lut->obj_link);
- list_del(&lut->ctx_link);
-
- i915_lut_handle_free(lut);
- __i915_gem_object_release_unless_active(obj);
- }
-
- mutex_unlock(&i915->drm.struct_mutex);
-}
-
-static unsigned long to_wait_timeout(s64 timeout_ns)
-{
- if (timeout_ns < 0)
- return MAX_SCHEDULE_TIMEOUT;
-
- if (timeout_ns == 0)
- return 0;
-
- return nsecs_to_jiffies_timeout(timeout_ns);
-}
-
-/**
- * i915_gem_wait_ioctl - implements DRM_IOCTL_I915_GEM_WAIT
- * @dev: drm device pointer
- * @data: ioctl data blob
- * @file: drm file pointer
- *
- * Returns 0 if successful, else an error is returned with the remaining time in
- * the timeout parameter.
- * -ETIME: object is still busy after timeout
- * -ERESTARTSYS: signal interrupted the wait
- * -ENONENT: object doesn't exist
- * Also possible, but rare:
- * -EAGAIN: incomplete, restart syscall
- * -ENOMEM: damn
- * -ENODEV: Internal IRQ fail
- * -E?: The add request failed
- *
- * The wait ioctl with a timeout of 0 reimplements the busy ioctl. With any
- * non-zero timeout parameter the wait ioctl will wait for the given number of
- * nanoseconds on an object becoming unbusy. Since the wait itself does so
- * without holding struct_mutex the object may become re-busied before this
- * function completes. A similar but shorter * race condition exists in the busy
- * ioctl
- */
-int
-i915_gem_wait_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
-{
- struct drm_i915_gem_wait *args = data;
- struct drm_i915_gem_object *obj;
- ktime_t start;
- long ret;
-
- if (args->flags != 0)
- return -EINVAL;
-
- obj = i915_gem_object_lookup(file, args->bo_handle);
- if (!obj)
- return -ENOENT;
-
- start = ktime_get();
-
- ret = i915_gem_object_wait(obj,
- I915_WAIT_INTERRUPTIBLE |
- I915_WAIT_PRIORITY |
- I915_WAIT_ALL,
- to_wait_timeout(args->timeout_ns));
-
- if (args->timeout_ns > 0) {
- args->timeout_ns -= ktime_to_ns(ktime_sub(ktime_get(), start));
- if (args->timeout_ns < 0)
- args->timeout_ns = 0;
-
- /*
- * Apparently ktime isn't accurate enough and occasionally has a
- * bit of mismatch in the jiffies<->nsecs<->ktime loop. So patch
- * things up to make the test happy. We allow up to 1 jiffy.
- *
- * This is a regression from the timespec->ktime conversion.
- */
- if (ret == -ETIME && !nsecs_to_jiffies(args->timeout_ns))
- args->timeout_ns = 0;
-
- /* Asked to wait beyond the jiffie/scheduler precision? */
- if (ret == -ETIME && args->timeout_ns)
- ret = -EAGAIN;
- }
-
- i915_gem_object_put(obj);
- return ret;
-}
-
-static int wait_for_engines(struct drm_i915_private *i915)
-{
- if (wait_for(intel_engines_are_idle(i915), I915_IDLE_ENGINES_TIMEOUT)) {
- dev_err(i915->drm.dev,
- "Failed to idle engines, declaring wedged!\n");
- GEM_TRACE_DUMP();
- i915_gem_set_wedged(i915);
- return -EIO;
- }
-
- return 0;
-}
-
-static long
-wait_for_timelines(struct drm_i915_private *i915,
- unsigned int flags, long timeout)
-{
- struct i915_gt_timelines *gt = &i915->gt.timelines;
- struct i915_timeline *tl;
-
- mutex_lock(>->mutex);
- list_for_each_entry(tl, >->active_list, link) {
- struct i915_request *rq;
-
- rq = i915_active_request_get_unlocked(&tl->last_request);
- if (!rq)
- continue;
-
- mutex_unlock(>->mutex);
-
- /*
- * "Race-to-idle".
- *
- * Switching to the kernel context is often used a synchronous
- * step prior to idling, e.g. in suspend for flushing all
- * current operations to memory before sleeping. These we
- * want to complete as quickly as possible to avoid prolonged
- * stalls, so allow the gpu to boost to maximum clocks.
- */
- if (flags & I915_WAIT_FOR_IDLE_BOOST)
- gen6_rps_boost(rq);
-
- timeout = i915_request_wait(rq, flags, timeout);
- i915_request_put(rq);
- if (timeout < 0)
- return timeout;
-
- /* restart after reacquiring the lock */
- mutex_lock(>->mutex);
- tl = list_entry(>->active_list, typeof(*tl), link);
- }
- mutex_unlock(>->mutex);
-
- return timeout;
-}
-
-int i915_gem_wait_for_idle(struct drm_i915_private *i915,
- unsigned int flags, long timeout)
-{
- GEM_TRACE("flags=%x (%s), timeout=%ld%s, awake?=%s\n",
- flags, flags & I915_WAIT_LOCKED ? "locked" : "unlocked",
- timeout, timeout == MAX_SCHEDULE_TIMEOUT ? " (forever)" : "",
- yesno(i915->gt.awake));
-
- /* If the device is asleep, we have no requests outstanding */
- if (!READ_ONCE(i915->gt.awake))
- return 0;
-
- timeout = wait_for_timelines(i915, flags, timeout);
- if (timeout < 0)
- return timeout;
-
- if (flags & I915_WAIT_LOCKED) {
- int err;
-
- lockdep_assert_held(&i915->drm.struct_mutex);
-
- err = wait_for_engines(i915);
- if (err)
- return err;
-
- i915_retire_requests(i915);
- }
-
- return 0;
-}
-
-static void __i915_gem_object_flush_for_display(struct drm_i915_gem_object *obj)
-{
- /*
- * We manually flush the CPU domain so that we can override and
- * force the flush for the display, and perform it asyncrhonously.
- */
- flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
- if (obj->cache_dirty)
- i915_gem_clflush_object(obj, I915_CLFLUSH_FORCE);
- obj->write_domain = 0;
-}
-
-void i915_gem_object_flush_if_display(struct drm_i915_gem_object *obj)
-{
- if (!READ_ONCE(obj->pin_global))
- return;
-
- mutex_lock(&obj->base.dev->struct_mutex);
- __i915_gem_object_flush_for_display(obj);
- mutex_unlock(&obj->base.dev->struct_mutex);
-}
-
-/**
- * Moves a single object to the WC read, and possibly write domain.
- * @obj: object to act on
- * @write: ask for write access or read only
- *
- * This function returns when the move is complete, including waiting on
- * flushes to occur.
- */
-int
-i915_gem_object_set_to_wc_domain(struct drm_i915_gem_object *obj, bool write)
-{
- int ret;
-
- lockdep_assert_held(&obj->base.dev->struct_mutex);
-
- ret = i915_gem_object_wait(obj,
- I915_WAIT_INTERRUPTIBLE |
- I915_WAIT_LOCKED |
- (write ? I915_WAIT_ALL : 0),
- MAX_SCHEDULE_TIMEOUT);
- if (ret)
- return ret;
-
- if (obj->write_domain == I915_GEM_DOMAIN_WC)
- return 0;
-
- /* Flush and acquire obj->pages so that we are coherent through
- * direct access in memory with previous cached writes through
- * shmemfs and that our cache domain tracking remains valid.
- * For example, if the obj->filp was moved to swap without us
- * being notified and releasing the pages, we would mistakenly
- * continue to assume that the obj remained out of the CPU cached
- * domain.
- */
- ret = i915_gem_object_pin_pages(obj);
- if (ret)
- return ret;
-
- flush_write_domain(obj, ~I915_GEM_DOMAIN_WC);
-
- /* Serialise direct access to this object with the barriers for
- * coherent writes from the GPU, by effectively invalidating the
- * WC domain upon first access.
- */
- if ((obj->read_domains & I915_GEM_DOMAIN_WC) == 0)
- mb();
-
- /* It should now be out of any other write domains, and we can update
- * the domain values for our changes.
- */
- GEM_BUG_ON((obj->write_domain & ~I915_GEM_DOMAIN_WC) != 0);
- obj->read_domains |= I915_GEM_DOMAIN_WC;
- if (write) {
- obj->read_domains = I915_GEM_DOMAIN_WC;
- obj->write_domain = I915_GEM_DOMAIN_WC;
- obj->mm.dirty = true;
- }
-
- i915_gem_object_unpin_pages(obj);
- return 0;
-}
-
-/**
- * Moves a single object to the GTT read, and possibly write domain.
- * @obj: object to act on
- * @write: ask for write access or read only
- *
- * This function returns when the move is complete, including waiting on
- * flushes to occur.
- */
-int
-i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj, bool write)
-{
- int ret;
-
- lockdep_assert_held(&obj->base.dev->struct_mutex);
-
- ret = i915_gem_object_wait(obj,
- I915_WAIT_INTERRUPTIBLE |
- I915_WAIT_LOCKED |
- (write ? I915_WAIT_ALL : 0),
- MAX_SCHEDULE_TIMEOUT);
- if (ret)
- return ret;
-
- if (obj->write_domain == I915_GEM_DOMAIN_GTT)
- return 0;
-
- /* Flush and acquire obj->pages so that we are coherent through
- * direct access in memory with previous cached writes through
- * shmemfs and that our cache domain tracking remains valid.
- * For example, if the obj->filp was moved to swap without us
- * being notified and releasing the pages, we would mistakenly
- * continue to assume that the obj remained out of the CPU cached
- * domain.
- */
- ret = i915_gem_object_pin_pages(obj);
- if (ret)
- return ret;
-
- flush_write_domain(obj, ~I915_GEM_DOMAIN_GTT);
-
- /* Serialise direct access to this object with the barriers for
- * coherent writes from the GPU, by effectively invalidating the
- * GTT domain upon first access.
- */
- if ((obj->read_domains & I915_GEM_DOMAIN_GTT) == 0)
- mb();
-
- /* It should now be out of any other write domains, and we can update
- * the domain values for our changes.
- */
- GEM_BUG_ON((obj->write_domain & ~I915_GEM_DOMAIN_GTT) != 0);
- obj->read_domains |= I915_GEM_DOMAIN_GTT;
- if (write) {
- obj->read_domains = I915_GEM_DOMAIN_GTT;
- obj->write_domain = I915_GEM_DOMAIN_GTT;
- obj->mm.dirty = true;
- }
-
- i915_gem_object_unpin_pages(obj);
- return 0;
-}
-
-/**
- * Changes the cache-level of an object across all VMA.
- * @obj: object to act on
- * @cache_level: new cache level to set for the object
- *
- * After this function returns, the object will be in the new cache-level
- * across all GTT and the contents of the backing storage will be coherent,
- * with respect to the new cache-level. In order to keep the backing storage
- * coherent for all users, we only allow a single cache level to be set
- * globally on the object and prevent it from being changed whilst the
- * hardware is reading from the object. That is if the object is currently
- * on the scanout it will be set to uncached (or equivalent display
- * cache coherency) and all non-MOCS GPU access will also be uncached so
- * that all direct access to the scanout remains coherent.
- */
-int i915_gem_object_set_cache_level(struct drm_i915_gem_object *obj,
- enum i915_cache_level cache_level)
-{
- struct i915_vma *vma;
- int ret;
-
- lockdep_assert_held(&obj->base.dev->struct_mutex);
-
- if (obj->cache_level == cache_level)
- return 0;
-
- /* Inspect the list of currently bound VMA and unbind any that would
- * be invalid given the new cache-level. This is principally to
- * catch the issue of the CS prefetch crossing page boundaries and
- * reading an invalid PTE on older architectures.
- */
-restart:
- list_for_each_entry(vma, &obj->vma.list, obj_link) {
- if (!drm_mm_node_allocated(&vma->node))
- continue;
-
- if (i915_vma_is_pinned(vma)) {
- DRM_DEBUG("can not change the cache level of pinned objects\n");
- return -EBUSY;
- }
-
- if (!i915_vma_is_closed(vma) &&
- i915_gem_valid_gtt_space(vma, cache_level))
- continue;
-
- ret = i915_vma_unbind(vma);
- if (ret)
- return ret;
-
- /* As unbinding may affect other elements in the
- * obj->vma_list (due to side-effects from retiring
- * an active vma), play safe and restart the iterator.
- */
- goto restart;
- }
-
- /* We can reuse the existing drm_mm nodes but need to change the
- * cache-level on the PTE. We could simply unbind them all and
- * rebind with the correct cache-level on next use. However since
- * we already have a valid slot, dma mapping, pages etc, we may as
- * rewrite the PTE in the belief that doing so tramples upon less
- * state and so involves less work.
- */
- if (obj->bind_count) {
- /* Before we change the PTE, the GPU must not be accessing it.
- * If we wait upon the object, we know that all the bound
- * VMA are no longer active.
- */
- ret = i915_gem_object_wait(obj,
- I915_WAIT_INTERRUPTIBLE |
- I915_WAIT_LOCKED |
- I915_WAIT_ALL,
- MAX_SCHEDULE_TIMEOUT);
- if (ret)
- return ret;
-
- if (!HAS_LLC(to_i915(obj->base.dev)) &&
- cache_level != I915_CACHE_NONE) {
- /* Access to snoopable pages through the GTT is
- * incoherent and on some machines causes a hard
- * lockup. Relinquish the CPU mmaping to force
- * userspace to refault in the pages and we can
- * then double check if the GTT mapping is still
- * valid for that pointer access.
- */
- i915_gem_release_mmap(obj);
-
- /* As we no longer need a fence for GTT access,
- * we can relinquish it now (and so prevent having
- * to steal a fence from someone else on the next
- * fence request). Note GPU activity would have
- * dropped the fence as all snoopable access is
- * supposed to be linear.
- */
- for_each_ggtt_vma(vma, obj) {
- ret = i915_vma_put_fence(vma);
- if (ret)
- return ret;
- }
- } else {
- /* We either have incoherent backing store and
- * so no GTT access or the architecture is fully
- * coherent. In such cases, existing GTT mmaps
- * ignore the cache bit in the PTE and we can
- * rewrite it without confusing the GPU or having
- * to force userspace to fault back in its mmaps.
- */
- }
-
- list_for_each_entry(vma, &obj->vma.list, obj_link) {
- if (!drm_mm_node_allocated(&vma->node))
- continue;
-
- ret = i915_vma_bind(vma, cache_level, PIN_UPDATE);
- if (ret)
- return ret;
- }
- }
-
- list_for_each_entry(vma, &obj->vma.list, obj_link)
- vma->node.color = cache_level;
- i915_gem_object_set_cache_coherency(obj, cache_level);
- obj->cache_dirty = true; /* Always invalidate stale cachelines */
-
- return 0;
-}
-
-int i915_gem_get_caching_ioctl(struct drm_device *dev, void *data,
- struct drm_file *file)
-{
- struct drm_i915_gem_caching *args = data;
- struct drm_i915_gem_object *obj;
- int err = 0;
-
- rcu_read_lock();
- obj = i915_gem_object_lookup_rcu(file, args->handle);
- if (!obj) {
- err = -ENOENT;
- goto out;
- }
-
- switch (obj->cache_level) {
- case I915_CACHE_LLC:
- case I915_CACHE_L3_LLC:
- args->caching = I915_CACHING_CACHED;
- break;
-
- case I915_CACHE_WT:
- args->caching = I915_CACHING_DISPLAY;
- break;
-
- default:
- args->caching = I915_CACHING_NONE;
- break;
- }
-out:
- rcu_read_unlock();
- return err;
-}
-
-int i915_gem_set_caching_ioctl(struct drm_device *dev, void *data,
- struct drm_file *file)
-{
- struct drm_i915_private *i915 = to_i915(dev);
- struct drm_i915_gem_caching *args = data;
- struct drm_i915_gem_object *obj;
- enum i915_cache_level level;
- int ret = 0;
-
- switch (args->caching) {
- case I915_CACHING_NONE:
- level = I915_CACHE_NONE;
- break;
- case I915_CACHING_CACHED:
- /*
- * Due to a HW issue on BXT A stepping, GPU stores via a
- * snooped mapping may leave stale data in a corresponding CPU
- * cacheline, whereas normally such cachelines would get
- * invalidated.
- */
- if (!HAS_LLC(i915) && !HAS_SNOOP(i915))
- return -ENODEV;
-
- level = I915_CACHE_LLC;
- break;
- case I915_CACHING_DISPLAY:
- level = HAS_WT(i915) ? I915_CACHE_WT : I915_CACHE_NONE;
- break;
- default:
- return -EINVAL;
- }
-
- obj = i915_gem_object_lookup(file, args->handle);
- if (!obj)
- return -ENOENT;
-
- /*
- * The caching mode of proxy object is handled by its generator, and
- * not allowed to be changed by userspace.
- */
- if (i915_gem_object_is_proxy(obj)) {
- ret = -ENXIO;
- goto out;
- }
-
- if (obj->cache_level == level)
- goto out;
-
- ret = i915_gem_object_wait(obj,
- I915_WAIT_INTERRUPTIBLE,
- MAX_SCHEDULE_TIMEOUT);
- if (ret)
- goto out;
-
- ret = i915_mutex_lock_interruptible(dev);
- if (ret)
- goto out;
-
- ret = i915_gem_object_set_cache_level(obj, level);
- mutex_unlock(&dev->struct_mutex);
-
-out:
- i915_gem_object_put(obj);
- return ret;
-}
-
-/*
- * Prepare buffer for display plane (scanout, cursors, etc). Can be called from
- * an uninterruptible phase (modesetting) and allows any flushes to be pipelined
- * (for pageflips). We only flush the caches while preparing the buffer for
- * display, the callers are responsible for frontbuffer flush.
- */
-struct i915_vma *
-i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj,
- u32 alignment,
- const struct i915_ggtt_view *view,
- unsigned int flags)
-{
- struct i915_vma *vma;
- int ret;
-
- lockdep_assert_held(&obj->base.dev->struct_mutex);
-
- /* Mark the global pin early so that we account for the
- * display coherency whilst setting up the cache domains.
- */
- obj->pin_global++;
-
- /* The display engine is not coherent with the LLC cache on gen6. As
- * a result, we make sure that the pinning that is about to occur is
- * done with uncached PTEs. This is lowest common denominator for all
- * chipsets.
- *
- * However for gen6+, we could do better by using the GFDT bit instead
- * of uncaching, which would allow us to flush all the LLC-cached data
- * with that bit in the PTE to main memory with just one PIPE_CONTROL.
- */
- ret = i915_gem_object_set_cache_level(obj,
- HAS_WT(to_i915(obj->base.dev)) ?
- I915_CACHE_WT : I915_CACHE_NONE);
- if (ret) {
- vma = ERR_PTR(ret);
- goto err_unpin_global;
- }
-
- /* As the user may map the buffer once pinned in the display plane
- * (e.g. libkms for the bootup splash), we have to ensure that we
- * always use map_and_fenceable for all scanout buffers. However,
- * it may simply be too big to fit into mappable, in which case
- * put it anyway and hope that userspace can cope (but always first
- * try to preserve the existing ABI).
- */
- vma = ERR_PTR(-ENOSPC);
- if ((flags & PIN_MAPPABLE) == 0 &&
- (!view || view->type == I915_GGTT_VIEW_NORMAL))
- vma = i915_gem_object_ggtt_pin(obj, view, 0, alignment,
- flags |
- PIN_MAPPABLE |
- PIN_NONBLOCK);
- if (IS_ERR(vma))
- vma = i915_gem_object_ggtt_pin(obj, view, 0, alignment, flags);
- if (IS_ERR(vma))
- goto err_unpin_global;
-
- vma->display_alignment = max_t(u64, vma->display_alignment, alignment);
-
- __i915_gem_object_flush_for_display(obj);
-
- /* It should now be out of any other write domains, and we can update
- * the domain values for our changes.
- */
- obj->read_domains |= I915_GEM_DOMAIN_GTT;
-
- return vma;
-
-err_unpin_global:
- obj->pin_global--;
- return vma;
-}
-
-void
-i915_gem_object_unpin_from_display_plane(struct i915_vma *vma)
-{
- lockdep_assert_held(&vma->vm->i915->drm.struct_mutex);
-
- if (WARN_ON(vma->obj->pin_global == 0))
- return;
-
- if (--vma->obj->pin_global == 0)
- vma->display_alignment = I915_GTT_MIN_ALIGNMENT;
-
- /* Bump the LRU to try and avoid premature eviction whilst flipping */
- i915_gem_object_bump_inactive_ggtt(vma->obj);
-
- i915_vma_unpin(vma);
-}
-
-/**
- * Moves a single object to the CPU read, and possibly write domain.
- * @obj: object to act on
- * @write: requesting write or read-only access
- *
- * This function returns when the move is complete, including waiting on
- * flushes to occur.
- */
-int
-i915_gem_object_set_to_cpu_domain(struct drm_i915_gem_object *obj, bool write)
-{
- int ret;
-
- lockdep_assert_held(&obj->base.dev->struct_mutex);
-
- ret = i915_gem_object_wait(obj,
- I915_WAIT_INTERRUPTIBLE |
- I915_WAIT_LOCKED |
- (write ? I915_WAIT_ALL : 0),
- MAX_SCHEDULE_TIMEOUT);
- if (ret)
- return ret;
-
- flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
+ err = wait_for_engines(i915);
+ if (err)
+ return err;
- /* Flush the CPU cache if it's still invalid. */
- if ((obj->read_domains & I915_GEM_DOMAIN_CPU) == 0) {
- i915_gem_clflush_object(obj, I915_CLFLUSH_SYNC);
- obj->read_domains |= I915_GEM_DOMAIN_CPU;
+ i915_retire_requests(i915);
}
- /* It should now be out of any other write domains, and we can update
- * the domain values for our changes.
- */
- GEM_BUG_ON(obj->write_domain & ~I915_GEM_DOMAIN_CPU);
-
- /* If we're writing through the CPU, then the GPU read domains will
- * need to be invalidated at next use.
- */
- if (write)
- __start_cpu_write(obj);
-
return 0;
}
-/* Throttle our rendering by waiting until the ring has completed our requests
- * emitted over 20 msec ago.
- *
- * Note that if we were to use the current jiffies each time around the loop,
- * we wouldn't escape the function with any frames outstanding if the time to
- * render a frame was over 20ms.
- *
- * This should get us reasonable parallelism between CPU and GPU but also
- * relatively low latency when blocking on a particular request to finish.
- */
-static int
-i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file)
-{
- struct drm_i915_private *dev_priv = to_i915(dev);
- struct drm_i915_file_private *file_priv = file->driver_priv;
- unsigned long recent_enough = jiffies - DRM_I915_THROTTLE_JIFFIES;
- struct i915_request *request, *target = NULL;
- long ret;
-
- /* ABI: return -EIO if already wedged */
- ret = i915_terminally_wedged(dev_priv);
- if (ret)
- return ret;
-
- spin_lock(&file_priv->mm.lock);
- list_for_each_entry(request, &file_priv->mm.request_list, client_link) {
- if (time_after_eq(request->emitted_jiffies, recent_enough))
- break;
-
- if (target) {
- list_del(&target->client_link);
- target->file_priv = NULL;
- }
-
- target = request;
- }
- if (target)
- i915_request_get(target);
- spin_unlock(&file_priv->mm.lock);
-
- if (target == NULL)
- return 0;
-
- ret = i915_request_wait(target,
- I915_WAIT_INTERRUPTIBLE,
- MAX_SCHEDULE_TIMEOUT);
- i915_request_put(target);
-
- return ret < 0 ? ret : 0;
-}
-
struct i915_vma *
i915_gem_object_ggtt_pin(struct drm_i915_gem_object *obj,
const struct i915_ggtt_view *view,
* More interesting would to do search for a free
* block prior to making the commitment to unbind.
* That caters for the self-harm case, and with a
- * little more heuristics (e.g. NOFAULT, NOEVICT)
- * we could try to minimise harm to others.
- */
- if (flags & PIN_NONBLOCK &&
- obj->base.size > dev_priv->ggtt.mappable_end / 2)
- return ERR_PTR(-ENOSPC);
- }
-
- vma = i915_vma_instance(obj, vm, view);
- if (IS_ERR(vma))
- return vma;
-
- if (i915_vma_misplaced(vma, size, alignment, flags)) {
- if (flags & PIN_NONBLOCK) {
- if (i915_vma_is_pinned(vma) || i915_vma_is_active(vma))
- return ERR_PTR(-ENOSPC);
-
- if (flags & PIN_MAPPABLE &&
- vma->fence_size > dev_priv->ggtt.mappable_end / 2)
- return ERR_PTR(-ENOSPC);
- }
-
- WARN(i915_vma_is_pinned(vma),
- "bo is already pinned in ggtt with incorrect alignment:"
- " offset=%08x, req.alignment=%llx,"
- " req.map_and_fenceable=%d, vma->map_and_fenceable=%d\n",
- i915_ggtt_offset(vma), alignment,
- !!(flags & PIN_MAPPABLE),
- i915_vma_is_map_and_fenceable(vma));
- ret = i915_vma_unbind(vma);
- if (ret)
- return ERR_PTR(ret);
- }
-
- ret = i915_vma_pin(vma, size, alignment, flags | PIN_GLOBAL);
- if (ret)
- return ERR_PTR(ret);
-
- return vma;
-}
-
-static __always_inline u32 __busy_read_flag(u8 id)
-{
- if (id == (u8)I915_ENGINE_CLASS_INVALID)
- return 0xffff0000u;
-
- GEM_BUG_ON(id >= 16);
- return 0x10000u << id;
-}
-
-static __always_inline u32 __busy_write_id(u8 id)
-{
- /*
- * The uABI guarantees an active writer is also amongst the read
- * engines. This would be true if we accessed the activity tracking
- * under the lock, but as we perform the lookup of the object and
- * its activity locklessly we can not guarantee that the last_write
- * being active implies that we have set the same engine flag from
- * last_read - hence we always set both read and write busy for
- * last_write.
- */
- if (id == (u8)I915_ENGINE_CLASS_INVALID)
- return 0xffffffffu;
-
- return (id + 1) | __busy_read_flag(id);
-}
-
-static __always_inline unsigned int
-__busy_set_if_active(const struct dma_fence *fence, u32 (*flag)(u8 id))
-{
- const struct i915_request *rq;
-
- /*
- * We have to check the current hw status of the fence as the uABI
- * guarantees forward progress. We could rely on the idle worker
- * to eventually flush us, but to minimise latency just ask the
- * hardware.
- *
- * Note we only report on the status of native fences.
- */
- if (!dma_fence_is_i915(fence))
- return 0;
-
- /* opencode to_request() in order to avoid const warnings */
- rq = container_of(fence, const struct i915_request, fence);
- if (i915_request_completed(rq))
- return 0;
-
- /* Beware type-expansion follies! */
- BUILD_BUG_ON(!typecheck(u8, rq->engine->uabi_class));
- return flag(rq->engine->uabi_class);
-}
-
-static __always_inline unsigned int
-busy_check_reader(const struct dma_fence *fence)
-{
- return __busy_set_if_active(fence, __busy_read_flag);
-}
-
-static __always_inline unsigned int
-busy_check_writer(const struct dma_fence *fence)
-{
- if (!fence)
- return 0;
-
- return __busy_set_if_active(fence, __busy_write_id);
-}
-
-int
-i915_gem_busy_ioctl(struct drm_device *dev, void *data,
- struct drm_file *file)
-{
- struct drm_i915_gem_busy *args = data;
- struct drm_i915_gem_object *obj;
- struct reservation_object_list *list;
- unsigned int seq;
- int err;
-
- err = -ENOENT;
- rcu_read_lock();
- obj = i915_gem_object_lookup_rcu(file, args->handle);
- if (!obj)
- goto out;
-
- /*
- * A discrepancy here is that we do not report the status of
- * non-i915 fences, i.e. even though we may report the object as idle,
- * a call to set-domain may still stall waiting for foreign rendering.
- * This also means that wait-ioctl may report an object as busy,
- * where busy-ioctl considers it idle.
- *
- * We trade the ability to warn of foreign fences to report on which
- * i915 engines are active for the object.
- *
- * Alternatively, we can trade that extra information on read/write
- * activity with
- * args->busy =
- * !reservation_object_test_signaled_rcu(obj->resv, true);
- * to report the overall busyness. This is what the wait-ioctl does.
- *
- */
-retry:
- seq = raw_read_seqcount(&obj->resv->seq);
-
- /* Translate the exclusive fence to the READ *and* WRITE engine */
- args->busy = busy_check_writer(rcu_dereference(obj->resv->fence_excl));
-
- /* Translate shared fences to READ set of engines */
- list = rcu_dereference(obj->resv->fence);
- if (list) {
- unsigned int shared_count = list->shared_count, i;
-
- for (i = 0; i < shared_count; ++i) {
- struct dma_fence *fence =
- rcu_dereference(list->shared[i]);
-
- args->busy |= busy_check_reader(fence);
- }
- }
-
- if (args->busy && read_seqcount_retry(&obj->resv->seq, seq))
- goto retry;
-
- err = 0;
-out:
- rcu_read_unlock();
- return err;
-}
-
-int
-i915_gem_throttle_ioctl(struct drm_device *dev, void *data,
- struct drm_file *file_priv)
-{
- return i915_gem_ring_throttle(dev, file_priv);
-}
-
-int
-i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
- struct drm_file *file_priv)
-{
- struct drm_i915_private *dev_priv = to_i915(dev);
- struct drm_i915_gem_madvise *args = data;
- struct drm_i915_gem_object *obj;
- int err;
-
- switch (args->madv) {
- case I915_MADV_DONTNEED:
- case I915_MADV_WILLNEED:
- break;
- default:
- return -EINVAL;
- }
-
- obj = i915_gem_object_lookup(file_priv, args->handle);
- if (!obj)
- return -ENOENT;
-
- err = mutex_lock_interruptible(&obj->mm.lock);
- if (err)
- goto out;
-
- if (i915_gem_object_has_pages(obj) &&
- i915_gem_object_is_tiled(obj) &&
- dev_priv->quirks & QUIRK_PIN_SWIZZLED_PAGES) {
- if (obj->mm.madv == I915_MADV_WILLNEED) {
- GEM_BUG_ON(!obj->mm.quirked);
- __i915_gem_object_unpin_pages(obj);
- obj->mm.quirked = false;
- }
- if (args->madv == I915_MADV_WILLNEED) {
- GEM_BUG_ON(obj->mm.quirked);
- __i915_gem_object_pin_pages(obj);
- obj->mm.quirked = true;
- }
- }
-
- if (obj->mm.madv != __I915_MADV_PURGED)
- obj->mm.madv = args->madv;
-
- /* if the object is no longer attached, discard its backing storage */
- if (obj->mm.madv == I915_MADV_DONTNEED &&
- !i915_gem_object_has_pages(obj))
- __i915_gem_object_truncate(obj);
-
- args->retained = obj->mm.madv != __I915_MADV_PURGED;
- mutex_unlock(&obj->mm.lock);
-
-out:
- i915_gem_object_put(obj);
- return err;
-}
-
-static void
-frontbuffer_retire(struct i915_active_request *active,
- struct i915_request *request)
-{
- struct drm_i915_gem_object *obj =
- container_of(active, typeof(*obj), frontbuffer_write);
-
- intel_fb_obj_flush(obj, ORIGIN_CS);
-}
-
-void i915_gem_object_init(struct drm_i915_gem_object *obj,
- const struct drm_i915_gem_object_ops *ops)
-{
- mutex_init(&obj->mm.lock);
-
- spin_lock_init(&obj->vma.lock);
- INIT_LIST_HEAD(&obj->vma.list);
-
- INIT_LIST_HEAD(&obj->lut_list);
- INIT_LIST_HEAD(&obj->batch_pool_link);
-
- init_rcu_head(&obj->rcu);
-
- obj->ops = ops;
-
- reservation_object_init(&obj->__builtin_resv);
- obj->resv = &obj->__builtin_resv;
-
- obj->frontbuffer_ggtt_origin = ORIGIN_GTT;
- i915_active_request_init(&obj->frontbuffer_write,
- NULL, frontbuffer_retire);
-
- obj->mm.madv = I915_MADV_WILLNEED;
- INIT_RADIX_TREE(&obj->mm.get_page.radix, GFP_KERNEL | __GFP_NOWARN);
- mutex_init(&obj->mm.get_page.lock);
-
- i915_gem_info_add_obj(to_i915(obj->base.dev), obj->base.size);
-}
-
-static const struct drm_i915_gem_object_ops i915_gem_object_ops = {
- .flags = I915_GEM_OBJECT_HAS_STRUCT_PAGE |
- I915_GEM_OBJECT_IS_SHRINKABLE,
-
- .get_pages = i915_gem_object_get_pages_gtt,
- .put_pages = i915_gem_object_put_pages_gtt,
-
- .pwrite = i915_gem_object_pwrite_gtt,
-};
-
-static int i915_gem_object_create_shmem(struct drm_device *dev,
- struct drm_gem_object *obj,
- size_t size)
-{
- struct drm_i915_private *i915 = to_i915(dev);
- unsigned long flags = VM_NORESERVE;
- struct file *filp;
-
- drm_gem_private_object_init(dev, obj, size);
-
- if (i915->mm.gemfs)
- filp = shmem_file_setup_with_mnt(i915->mm.gemfs, "i915", size,
- flags);
- else
- filp = shmem_file_setup("i915", size, flags);
-
- if (IS_ERR(filp))
- return PTR_ERR(filp);
-
- obj->filp = filp;
-
- return 0;
-}
-
-struct drm_i915_gem_object *
-i915_gem_object_create(struct drm_i915_private *dev_priv, u64 size)
-{
- struct drm_i915_gem_object *obj;
- struct address_space *mapping;
- unsigned int cache_level;
- gfp_t mask;
- int ret;
-
- /* There is a prevalence of the assumption that we fit the object's
- * page count inside a 32bit _signed_ variable. Let's document this and
- * catch if we ever need to fix it. In the meantime, if you do spot
- * such a local variable, please consider fixing!
- */
- if (size >> PAGE_SHIFT > INT_MAX)
- return ERR_PTR(-E2BIG);
-
- if (overflows_type(size, obj->base.size))
- return ERR_PTR(-E2BIG);
-
- obj = i915_gem_object_alloc();
- if (obj == NULL)
- return ERR_PTR(-ENOMEM);
-
- ret = i915_gem_object_create_shmem(&dev_priv->drm, &obj->base, size);
- if (ret)
- goto fail;
-
- mask = GFP_HIGHUSER | __GFP_RECLAIMABLE;
- if (IS_I965GM(dev_priv) || IS_I965G(dev_priv)) {
- /* 965gm cannot relocate objects above 4GiB. */
- mask &= ~__GFP_HIGHMEM;
- mask |= __GFP_DMA32;
- }
-
- mapping = obj->base.filp->f_mapping;
- mapping_set_gfp_mask(mapping, mask);
- GEM_BUG_ON(!(mapping_gfp_mask(mapping) & __GFP_RECLAIM));
-
- i915_gem_object_init(obj, &i915_gem_object_ops);
-
- obj->write_domain = I915_GEM_DOMAIN_CPU;
- obj->read_domains = I915_GEM_DOMAIN_CPU;
-
- if (HAS_LLC(dev_priv))
- /* On some devices, we can have the GPU use the LLC (the CPU
- * cache) for about a 10% performance improvement
- * compared to uncached. Graphics requests other than
- * display scanout are coherent with the CPU in
- * accessing this cache. This means in this mode we
- * don't need to clflush on the CPU side, and on the
- * GPU side we only need to flush internal caches to
- * get data visible to the CPU.
- *
- * However, we maintain the display planes as UC, and so
- * need to rebind when first used as such.
+ * little more heuristics (e.g. NOFAULT, NOEVICT)
+ * we could try to minimise harm to others.
*/
- cache_level = I915_CACHE_LLC;
- else
- cache_level = I915_CACHE_NONE;
-
- i915_gem_object_set_cache_coherency(obj, cache_level);
-
- trace_i915_gem_object_create(obj);
+ if (flags & PIN_NONBLOCK &&
+ obj->base.size > dev_priv->ggtt.mappable_end / 2)
+ return ERR_PTR(-ENOSPC);
+ }
- return obj;
+ vma = i915_vma_instance(obj, vm, view);
+ if (IS_ERR(vma))
+ return vma;
-fail:
- i915_gem_object_free(obj);
- return ERR_PTR(ret);
-}
+ if (i915_vma_misplaced(vma, size, alignment, flags)) {
+ if (flags & PIN_NONBLOCK) {
+ if (i915_vma_is_pinned(vma) || i915_vma_is_active(vma))
+ return ERR_PTR(-ENOSPC);
-static bool discard_backing_storage(struct drm_i915_gem_object *obj)
-{
- /* If we are the last user of the backing storage (be it shmemfs
- * pages or stolen etc), we know that the pages are going to be
- * immediately released. In this case, we can then skip copying
- * back the contents from the GPU.
- */
+ if (flags & PIN_MAPPABLE &&
+ vma->fence_size > dev_priv->ggtt.mappable_end / 2)
+ return ERR_PTR(-ENOSPC);
+ }
- if (obj->mm.madv != I915_MADV_WILLNEED)
- return false;
+ WARN(i915_vma_is_pinned(vma),
+ "bo is already pinned in ggtt with incorrect alignment:"
+ " offset=%08x, req.alignment=%llx,"
+ " req.map_and_fenceable=%d, vma->map_and_fenceable=%d\n",
+ i915_ggtt_offset(vma), alignment,
+ !!(flags & PIN_MAPPABLE),
+ i915_vma_is_map_and_fenceable(vma));
+ ret = i915_vma_unbind(vma);
+ if (ret)
+ return ERR_PTR(ret);
+ }
- if (obj->base.filp == NULL)
- return true;
+ ret = i915_vma_pin(vma, size, alignment, flags | PIN_GLOBAL);
+ if (ret)
+ return ERR_PTR(ret);
- /* At first glance, this looks racy, but then again so would be
- * userspace racing mmap against close. However, the first external
- * reference to the filp can only be obtained through the
- * i915_gem_mmap_ioctl() which safeguards us against the user
- * acquiring such a reference whilst we are in the middle of
- * freeing the object.
- */
- return atomic_long_read(&obj->base.filp->f_count) == 1;
+ return vma;
}
-static void __i915_gem_free_objects(struct drm_i915_private *i915,
- struct llist_node *freed)
+int
+i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
{
- struct drm_i915_gem_object *obj, *on;
- intel_wakeref_t wakeref;
+ struct drm_i915_private *i915 = to_i915(dev);
+ struct drm_i915_gem_madvise *args = data;
+ struct drm_i915_gem_object *obj;
+ int err;
- wakeref = intel_runtime_pm_get(i915);
- llist_for_each_entry_safe(obj, on, freed, freed) {
- struct i915_vma *vma, *vn;
+ switch (args->madv) {
+ case I915_MADV_DONTNEED:
+ case I915_MADV_WILLNEED:
+ break;
+ default:
+ return -EINVAL;
+ }
- trace_i915_gem_object_destroy(obj);
+ obj = i915_gem_object_lookup(file_priv, args->handle);
+ if (!obj)
+ return -ENOENT;
- mutex_lock(&i915->drm.struct_mutex);
+ err = mutex_lock_interruptible(&obj->mm.lock);
+ if (err)
+ goto out;
- GEM_BUG_ON(i915_gem_object_is_active(obj));
- list_for_each_entry_safe(vma, vn, &obj->vma.list, obj_link) {
- GEM_BUG_ON(i915_vma_is_active(vma));
- vma->flags &= ~I915_VMA_PIN_MASK;
- i915_vma_destroy(vma);
+ if (i915_gem_object_has_pages(obj) &&
+ i915_gem_object_is_tiled(obj) &&
+ i915->quirks & QUIRK_PIN_SWIZZLED_PAGES) {
+ if (obj->mm.madv == I915_MADV_WILLNEED) {
+ GEM_BUG_ON(!obj->mm.quirked);
+ __i915_gem_object_unpin_pages(obj);
+ obj->mm.quirked = false;
}
- GEM_BUG_ON(!list_empty(&obj->vma.list));
- GEM_BUG_ON(!RB_EMPTY_ROOT(&obj->vma.tree));
-
- /* This serializes freeing with the shrinker. Since the free
- * is delayed, first by RCU then by the workqueue, we want the
- * shrinker to be able to free pages of unreferenced objects,
- * or else we may oom whilst there are plenty of deferred
- * freed objects.
- */
- if (i915_gem_object_has_pages(obj)) {
- spin_lock(&i915->mm.obj_lock);
- list_del_init(&obj->mm.link);
- spin_unlock(&i915->mm.obj_lock);
+ if (args->madv == I915_MADV_WILLNEED) {
+ GEM_BUG_ON(obj->mm.quirked);
+ __i915_gem_object_pin_pages(obj);
+ obj->mm.quirked = true;
}
-
- mutex_unlock(&i915->drm.struct_mutex);
-
- GEM_BUG_ON(obj->bind_count);
- GEM_BUG_ON(obj->userfault_count);
- GEM_BUG_ON(atomic_read(&obj->frontbuffer_bits));
- GEM_BUG_ON(!list_empty(&obj->lut_list));
-
- if (obj->ops->release)
- obj->ops->release(obj);
-
- if (WARN_ON(i915_gem_object_has_pinned_pages(obj)))
- atomic_set(&obj->mm.pages_pin_count, 0);
- __i915_gem_object_put_pages(obj, I915_MM_NORMAL);
- GEM_BUG_ON(i915_gem_object_has_pages(obj));
-
- if (obj->base.import_attach)
- drm_prime_gem_destroy(&obj->base, NULL);
-
- reservation_object_fini(&obj->__builtin_resv);
- drm_gem_object_release(&obj->base);
- i915_gem_info_remove_obj(i915, obj->base.size);
-
- bitmap_free(obj->bit_17);
- i915_gem_object_free(obj);
-
- GEM_BUG_ON(!atomic_read(&i915->mm.free_count));
- atomic_dec(&i915->mm.free_count);
-
- if (on)
- cond_resched();
}
- intel_runtime_pm_put(i915, wakeref);
-}
-static void i915_gem_flush_free_objects(struct drm_i915_private *i915)
-{
- struct llist_node *freed;
-
- /* Free the oldest, most stale object to keep the free_list short */
- freed = NULL;
- if (!llist_empty(&i915->mm.free_list)) { /* quick test for hotpath */
- /* Only one consumer of llist_del_first() allowed */
- spin_lock(&i915->mm.free_lock);
- freed = llist_del_first(&i915->mm.free_list);
- spin_unlock(&i915->mm.free_lock);
- }
- if (unlikely(freed)) {
- freed->next = NULL;
- __i915_gem_free_objects(i915, freed);
- }
-}
+ if (obj->mm.madv != __I915_MADV_PURGED)
+ obj->mm.madv = args->madv;
-static void __i915_gem_free_work(struct work_struct *work)
-{
- struct drm_i915_private *i915 =
- container_of(work, struct drm_i915_private, mm.free_work);
- struct llist_node *freed;
+ if (i915_gem_object_has_pages(obj)) {
+ struct list_head *list;
- /*
- * All file-owned VMA should have been released by this point through
- * i915_gem_close_object(), or earlier by i915_gem_context_close().
- * However, the object may also be bound into the global GTT (e.g.
- * older GPUs without per-process support, or for direct access through
- * the GTT either for the user or for scanout). Those VMA still need to
- * unbound now.
- */
+ if (i915_gem_object_is_shrinkable(obj)) {
+ unsigned long flags;
- spin_lock(&i915->mm.free_lock);
- while ((freed = llist_del_all(&i915->mm.free_list))) {
- spin_unlock(&i915->mm.free_lock);
+ spin_lock_irqsave(&i915->mm.obj_lock, flags);
- __i915_gem_free_objects(i915, freed);
- if (need_resched())
- return;
+ if (obj->mm.madv != I915_MADV_WILLNEED)
+ list = &i915->mm.purge_list;
+ else
+ list = &i915->mm.shrink_list;
+ list_move_tail(&obj->mm.link, list);
- spin_lock(&i915->mm.free_lock);
+ spin_unlock_irqrestore(&i915->mm.obj_lock, flags);
+ }
}
- spin_unlock(&i915->mm.free_lock);
-}
-
-static void __i915_gem_free_object_rcu(struct rcu_head *head)
-{
- struct drm_i915_gem_object *obj =
- container_of(head, typeof(*obj), rcu);
- struct drm_i915_private *i915 = to_i915(obj->base.dev);
- /*
- * We reuse obj->rcu for the freed list, so we had better not treat
- * it like a rcu_head from this point forwards. And we expect all
- * objects to be freed via this path.
- */
- destroy_rcu_head(&obj->rcu);
-
- /*
- * Since we require blocking on struct_mutex to unbind the freed
- * object from the GPU before releasing resources back to the
- * system, we can not do that directly from the RCU callback (which may
- * be a softirq context), but must instead then defer that work onto a
- * kthread. We use the RCU callback rather than move the freed object
- * directly onto the work queue so that we can mix between using the
- * worker and performing frees directly from subsequent allocations for
- * crude but effective memory throttling.
- */
- if (llist_add(&obj->freed, &i915->mm.free_list))
- queue_work(i915->wq, &i915->mm.free_work);
-}
-
-void i915_gem_free_object(struct drm_gem_object *gem_obj)
-{
- struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
-
- if (obj->mm.quirked)
- __i915_gem_object_unpin_pages(obj);
-
- if (discard_backing_storage(obj))
- obj->mm.madv = I915_MADV_DONTNEED;
-
- /*
- * Before we free the object, make sure any pure RCU-only
- * read-side critical sections are complete, e.g.
- * i915_gem_busy_ioctl(). For the corresponding synchronized
- * lookup see i915_gem_object_lookup_rcu().
- */
- atomic_inc(&to_i915(obj->base.dev)->mm.free_count);
- call_rcu(&obj->rcu, __i915_gem_free_object_rcu);
-}
+ /* if the object is no longer attached, discard its backing storage */
+ if (obj->mm.madv == I915_MADV_DONTNEED &&
+ !i915_gem_object_has_pages(obj))
+ i915_gem_object_truncate(obj);
-void __i915_gem_object_release_unless_active(struct drm_i915_gem_object *obj)
-{
- lockdep_assert_held(&obj->base.dev->struct_mutex);
+ args->retained = obj->mm.madv != __I915_MADV_PURGED;
+ mutex_unlock(&obj->mm.lock);
- if (!i915_gem_object_has_active_reference(obj) &&
- i915_gem_object_is_active(obj))
- i915_gem_object_set_active_reference(obj);
- else
- i915_gem_object_put(obj);
+out:
+ i915_gem_object_put(obj);
+ return err;
}
void i915_gem_sanitize(struct drm_i915_private *i915)
GEM_TRACE("\n");
- wakeref = intel_runtime_pm_get(i915);
+ wakeref = intel_runtime_pm_get(&i915->runtime_pm);
intel_uncore_forcewake_get(&i915->uncore, FORCEWAKE_ALL);
/*
intel_gt_sanitize(i915, false);
intel_uncore_forcewake_put(&i915->uncore, FORCEWAKE_ALL);
- intel_runtime_pm_put(i915, wakeref);
-
- mutex_lock(&i915->drm.struct_mutex);
- i915_gem_contexts_lost(i915);
- mutex_unlock(&i915->drm.struct_mutex);
+ intel_runtime_pm_put(&i915->runtime_pm, wakeref);
}
-void i915_gem_init_swizzling(struct drm_i915_private *dev_priv)
+static void init_unused_ring(struct intel_gt *gt, u32 base)
{
- if (INTEL_GEN(dev_priv) < 5 ||
- dev_priv->mm.bit_6_swizzle_x == I915_BIT_6_SWIZZLE_NONE)
- return;
+ struct intel_uncore *uncore = gt->uncore;
- I915_WRITE(DISP_ARB_CTL, I915_READ(DISP_ARB_CTL) |
- DISP_TILE_SURFACE_SWIZZLING);
-
- if (IS_GEN(dev_priv, 5))
- return;
-
- I915_WRITE(TILECTL, I915_READ(TILECTL) | TILECTL_SWZCTL);
- if (IS_GEN(dev_priv, 6))
- I915_WRITE(ARB_MODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_SNB));
- else if (IS_GEN(dev_priv, 7))
- I915_WRITE(ARB_MODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_IVB));
- else if (IS_GEN(dev_priv, 8))
- I915_WRITE(GAMTARBMODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_BDW));
- else
- BUG();
+ intel_uncore_write(uncore, RING_CTL(base), 0);
+ intel_uncore_write(uncore, RING_HEAD(base), 0);
+ intel_uncore_write(uncore, RING_TAIL(base), 0);
+ intel_uncore_write(uncore, RING_START(base), 0);
}
-static void init_unused_ring(struct drm_i915_private *dev_priv, u32 base)
+static void init_unused_rings(struct intel_gt *gt)
{
- I915_WRITE(RING_CTL(base), 0);
- I915_WRITE(RING_HEAD(base), 0);
- I915_WRITE(RING_TAIL(base), 0);
- I915_WRITE(RING_START(base), 0);
-}
+ struct drm_i915_private *i915 = gt->i915;
-static void init_unused_rings(struct drm_i915_private *dev_priv)
-{
- if (IS_I830(dev_priv)) {
- init_unused_ring(dev_priv, PRB1_BASE);
- init_unused_ring(dev_priv, SRB0_BASE);
- init_unused_ring(dev_priv, SRB1_BASE);
- init_unused_ring(dev_priv, SRB2_BASE);
- init_unused_ring(dev_priv, SRB3_BASE);
- } else if (IS_GEN(dev_priv, 2)) {
- init_unused_ring(dev_priv, SRB0_BASE);
- init_unused_ring(dev_priv, SRB1_BASE);
- } else if (IS_GEN(dev_priv, 3)) {
- init_unused_ring(dev_priv, PRB1_BASE);
- init_unused_ring(dev_priv, PRB2_BASE);
+ if (IS_I830(i915)) {
+ init_unused_ring(gt, PRB1_BASE);
+ init_unused_ring(gt, SRB0_BASE);
+ init_unused_ring(gt, SRB1_BASE);
+ init_unused_ring(gt, SRB2_BASE);
+ init_unused_ring(gt, SRB3_BASE);
+ } else if (IS_GEN(i915, 2)) {
+ init_unused_ring(gt, SRB0_BASE);
+ init_unused_ring(gt, SRB1_BASE);
+ } else if (IS_GEN(i915, 3)) {
+ init_unused_ring(gt, PRB1_BASE);
+ init_unused_ring(gt, PRB2_BASE);
}
}
/* ...and determine whether they are sticking. */
intel_gt_verify_workarounds(dev_priv, "init");
- i915_gem_init_swizzling(dev_priv);
+ intel_gt_init_swizzling(&dev_priv->gt);
/*
* At least 830 can leave some of the unused rings
* will prevent c3 entry. Makes sure all unused rings
* are totally idle.
*/
- init_unused_rings(dev_priv);
+ init_unused_rings(&dev_priv->gt);
BUG_ON(!dev_priv->kernel_context);
ret = i915_terminally_wedged(dev_priv);
if (err)
goto err_active;
+ i915_gem_object_lock(state->obj);
err = i915_gem_object_set_to_cpu_domain(state->obj, false);
+ i915_gem_object_unlock(state->obj);
if (err)
goto err_active;
return ret;
}
-void i915_gem_fini(struct drm_i915_private *dev_priv)
+void i915_gem_fini_hw(struct drm_i915_private *dev_priv)
{
GEM_BUG_ON(dev_priv->gt.awake);
- intel_wakeref_auto_fini(&dev_priv->mm.userfault_wakeref);
+ intel_wakeref_auto_fini(&dev_priv->ggtt.userfault_wakeref);
i915_gem_suspend_late(dev_priv);
intel_disable_gt_powersave(dev_priv);
mutex_lock(&dev_priv->drm.struct_mutex);
intel_uc_fini_hw(dev_priv);
intel_uc_fini(dev_priv);
+ mutex_unlock(&dev_priv->drm.struct_mutex);
+
+ i915_gem_drain_freed_objects(dev_priv);
+}
+
+void i915_gem_fini(struct drm_i915_private *dev_priv)
+{
+ mutex_lock(&dev_priv->drm.struct_mutex);
intel_engines_cleanup(dev_priv);
i915_gem_contexts_fini(dev_priv);
i915_gem_fini_scratch(dev_priv);
i915_gem_sanitize(i915);
}
-void
-i915_gem_load_init_fences(struct drm_i915_private *dev_priv)
-{
- int i;
-
- if (INTEL_GEN(dev_priv) >= 7 && !IS_VALLEYVIEW(dev_priv) &&
- !IS_CHERRYVIEW(dev_priv))
- dev_priv->num_fence_regs = 32;
- else if (INTEL_GEN(dev_priv) >= 4 ||
- IS_I945G(dev_priv) || IS_I945GM(dev_priv) ||
- IS_G33(dev_priv) || IS_PINEVIEW(dev_priv))
- dev_priv->num_fence_regs = 16;
- else
- dev_priv->num_fence_regs = 8;
-
- if (intel_vgpu_active(dev_priv))
- dev_priv->num_fence_regs =
- I915_READ(vgtif_reg(avail_rs.fence_num));
-
- /* Initialize fence registers to zero */
- for (i = 0; i < dev_priv->num_fence_regs; i++) {
- struct drm_i915_fence_reg *fence = &dev_priv->fence_regs[i];
-
- fence->i915 = dev_priv;
- fence->id = i;
- list_add_tail(&fence->link, &dev_priv->mm.fence_list);
- }
- i915_gem_restore_fences(dev_priv);
-
- i915_gem_detect_bit_6_swizzle(dev_priv);
-}
-
static void i915_gem_init__mm(struct drm_i915_private *i915)
{
- spin_lock_init(&i915->mm.object_stat_lock);
spin_lock_init(&i915->mm.obj_lock);
spin_lock_init(&i915->mm.free_lock);
init_llist_head(&i915->mm.free_list);
- INIT_LIST_HEAD(&i915->mm.unbound_list);
- INIT_LIST_HEAD(&i915->mm.bound_list);
- INIT_LIST_HEAD(&i915->mm.fence_list);
-
- INIT_LIST_HEAD(&i915->mm.userfault_list);
- intel_wakeref_auto_init(&i915->mm.userfault_wakeref, i915);
+ INIT_LIST_HEAD(&i915->mm.purge_list);
+ INIT_LIST_HEAD(&i915->mm.shrink_list);
- INIT_WORK(&i915->mm.free_work, __i915_gem_free_work);
+ i915_gem_init__objects(i915);
}
int i915_gem_init_early(struct drm_i915_private *dev_priv)
{
int err;
- intel_gt_pm_init(dev_priv);
-
- INIT_LIST_HEAD(&dev_priv->gt.active_rings);
- INIT_LIST_HEAD(&dev_priv->gt.closed_vma);
-
i915_gem_init__mm(dev_priv);
i915_gem_init__pm(dev_priv);
i915_gem_drain_freed_objects(dev_priv);
GEM_BUG_ON(!llist_empty(&dev_priv->mm.free_list));
GEM_BUG_ON(atomic_read(&dev_priv->mm.free_count));
- WARN_ON(dev_priv->mm.object_count);
+ WARN_ON(dev_priv->mm.shrink_count);
cleanup_srcu_struct(&dev_priv->gpu_error.reset_backoff_srcu);
int i915_gem_freeze_late(struct drm_i915_private *i915)
{
struct drm_i915_gem_object *obj;
- struct list_head *phases[] = {
- &i915->mm.unbound_list,
- &i915->mm.bound_list,
- NULL
- }, **phase;
+ intel_wakeref_t wakeref;
/*
* Called just before we write the hibernation image.
* the objects as well, see i915_gem_freeze()
*/
- i915_gem_shrink(i915, -1UL, NULL, I915_SHRINK_UNBOUND);
+ wakeref = intel_runtime_pm_get(&i915->runtime_pm);
+
+ i915_gem_shrink(i915, -1UL, NULL, ~0);
i915_gem_drain_freed_objects(i915);
- mutex_lock(&i915->drm.struct_mutex);
- for (phase = phases; *phase; phase++) {
- list_for_each_entry(obj, *phase, mm.link)
- WARN_ON(i915_gem_object_set_to_cpu_domain(obj, true));
+ list_for_each_entry(obj, &i915->mm.shrink_list, mm.link) {
+ i915_gem_object_lock(obj);
+ WARN_ON(i915_gem_object_set_to_cpu_domain(obj, true));
+ i915_gem_object_unlock(obj);
}
- mutex_unlock(&i915->drm.struct_mutex);
+
+ intel_runtime_pm_put(&i915->runtime_pm, wakeref);
return 0;
}
}
}
-/* Allocate a new GEM object and fill it with the supplied data */
-struct drm_i915_gem_object *
-i915_gem_object_create_from_data(struct drm_i915_private *dev_priv,
- const void *data, size_t size)
-{
- struct drm_i915_gem_object *obj;
- struct file *file;
- size_t offset;
- int err;
-
- obj = i915_gem_object_create(dev_priv, round_up(size, PAGE_SIZE));
- if (IS_ERR(obj))
- return obj;
-
- GEM_BUG_ON(obj->write_domain != I915_GEM_DOMAIN_CPU);
-
- file = obj->base.filp;
- offset = 0;
- do {
- unsigned int len = min_t(typeof(size), size, PAGE_SIZE);
- struct page *page;
- void *pgdata, *vaddr;
-
- err = pagecache_write_begin(file, file->f_mapping,
- offset, len, 0,
- &page, &pgdata);
- if (err < 0)
- goto fail;
-
- vaddr = kmap(page);
- memcpy(vaddr, data, len);
- kunmap(page);
-
- err = pagecache_write_end(file, file->f_mapping,
- offset, len, len,
- page, pgdata);
- if (err < 0)
- goto fail;
-
- size -= len;
- data += len;
- offset += len;
- } while (size);
-
- return obj;
-
-fail:
- i915_gem_object_put(obj);
- return ERR_PTR(err);
-}
-
-struct scatterlist *
-i915_gem_object_get_sg(struct drm_i915_gem_object *obj,
- unsigned int n,
- unsigned int *offset)
-{
- struct i915_gem_object_page_iter *iter = &obj->mm.get_page;
- struct scatterlist *sg;
- unsigned int idx, count;
-
- might_sleep();
- GEM_BUG_ON(n >= obj->base.size >> PAGE_SHIFT);
- GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj));
-
- /* As we iterate forward through the sg, we record each entry in a
- * radixtree for quick repeated (backwards) lookups. If we have seen
- * this index previously, we will have an entry for it.
- *
- * Initial lookup is O(N), but this is amortized to O(1) for
- * sequential page access (where each new request is consecutive
- * to the previous one). Repeated lookups are O(lg(obj->base.size)),
- * i.e. O(1) with a large constant!
- */
- if (n < READ_ONCE(iter->sg_idx))
- goto lookup;
-
- mutex_lock(&iter->lock);
-
- /* We prefer to reuse the last sg so that repeated lookup of this
- * (or the subsequent) sg are fast - comparing against the last
- * sg is faster than going through the radixtree.
- */
-
- sg = iter->sg_pos;
- idx = iter->sg_idx;
- count = __sg_page_count(sg);
-
- while (idx + count <= n) {
- void *entry;
- unsigned long i;
- int ret;
-
- /* If we cannot allocate and insert this entry, or the
- * individual pages from this range, cancel updating the
- * sg_idx so that on this lookup we are forced to linearly
- * scan onwards, but on future lookups we will try the
- * insertion again (in which case we need to be careful of
- * the error return reporting that we have already inserted
- * this index).
- */
- ret = radix_tree_insert(&iter->radix, idx, sg);
- if (ret && ret != -EEXIST)
- goto scan;
-
- entry = xa_mk_value(idx);
- for (i = 1; i < count; i++) {
- ret = radix_tree_insert(&iter->radix, idx + i, entry);
- if (ret && ret != -EEXIST)
- goto scan;
- }
-
- idx += count;
- sg = ____sg_next(sg);
- count = __sg_page_count(sg);
- }
-
-scan:
- iter->sg_pos = sg;
- iter->sg_idx = idx;
-
- mutex_unlock(&iter->lock);
-
- if (unlikely(n < idx)) /* insertion completed by another thread */
- goto lookup;
-
- /* In case we failed to insert the entry into the radixtree, we need
- * to look beyond the current sg.
- */
- while (idx + count <= n) {
- idx += count;
- sg = ____sg_next(sg);
- count = __sg_page_count(sg);
- }
-
- *offset = n - idx;
- return sg;
-
-lookup:
- rcu_read_lock();
-
- sg = radix_tree_lookup(&iter->radix, n);
- GEM_BUG_ON(!sg);
-
- /* If this index is in the middle of multi-page sg entry,
- * the radix tree will contain a value entry that points
- * to the start of that range. We will return the pointer to
- * the base page and the offset of this page within the
- * sg entry's range.
- */
- *offset = 0;
- if (unlikely(xa_is_value(sg))) {
- unsigned long base = xa_to_value(sg);
-
- sg = radix_tree_lookup(&iter->radix, base);
- GEM_BUG_ON(!sg);
-
- *offset = n - base;
- }
-
- rcu_read_unlock();
-
- return sg;
-}
-
-struct page *
-i915_gem_object_get_page(struct drm_i915_gem_object *obj, unsigned int n)
-{
- struct scatterlist *sg;
- unsigned int offset;
-
- GEM_BUG_ON(!i915_gem_object_has_struct_page(obj));
-
- sg = i915_gem_object_get_sg(obj, n, &offset);
- return nth_page(sg_page(sg), offset);
-}
-
-/* Like i915_gem_object_get_page(), but mark the returned page dirty */
-struct page *
-i915_gem_object_get_dirty_page(struct drm_i915_gem_object *obj,
- unsigned int n)
-{
- struct page *page;
-
- page = i915_gem_object_get_page(obj, n);
- if (!obj->mm.dirty)
- set_page_dirty(page);
-
- return page;
-}
-
-dma_addr_t
-i915_gem_object_get_dma_address_len(struct drm_i915_gem_object *obj,
- unsigned long n,
- unsigned int *len)
-{
- struct scatterlist *sg;
- unsigned int offset;
-
- sg = i915_gem_object_get_sg(obj, n, &offset);
-
- if (len)
- *len = sg_dma_len(sg) - (offset << PAGE_SHIFT);
-
- return sg_dma_address(sg) + (offset << PAGE_SHIFT);
-}
-
-dma_addr_t
-i915_gem_object_get_dma_address(struct drm_i915_gem_object *obj,
- unsigned long n)
-{
- return i915_gem_object_get_dma_address_len(obj, n, NULL);
-}
-
-
-int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj, int align)
-{
- struct sg_table *pages;
- int err;
-
- if (align > obj->base.size)
- return -EINVAL;
-
- if (obj->ops == &i915_gem_phys_ops)
- return 0;
-
- if (obj->ops != &i915_gem_object_ops)
- return -EINVAL;
-
- err = i915_gem_object_unbind(obj);
- if (err)
- return err;
-
- mutex_lock(&obj->mm.lock);
-
- if (obj->mm.madv != I915_MADV_WILLNEED) {
- err = -EFAULT;
- goto err_unlock;
- }
-
- if (obj->mm.quirked) {
- err = -EFAULT;
- goto err_unlock;
- }
-
- if (obj->mm.mapping) {
- err = -EBUSY;
- goto err_unlock;
- }
-
- pages = __i915_gem_object_unset_pages(obj);
-
- obj->ops = &i915_gem_phys_ops;
-
- err = ____i915_gem_object_get_pages(obj);
- if (err)
- goto err_xfer;
-
- /* Perma-pin (until release) the physical set of pages */
- __i915_gem_object_pin_pages(obj);
-
- if (!IS_ERR_OR_NULL(pages))
- i915_gem_object_ops.put_pages(obj, pages);
- mutex_unlock(&obj->mm.lock);
- return 0;
-
-err_xfer:
- obj->ops = &i915_gem_object_ops;
- if (!IS_ERR_OR_NULL(pages)) {
- unsigned int sg_page_sizes = i915_sg_page_sizes(pages->sgl);
-
- __i915_gem_object_set_pages(obj, pages, sg_page_sizes);
- }
-err_unlock:
- mutex_unlock(&obj->mm.lock);
- return err;
-}
-
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
-#include "selftests/scatterlist.c"
#include "selftests/mock_gem_device.c"
-#include "selftests/huge_gem_object.c"
-#include "selftests/huge_pages.c"
-#include "selftests/i915_gem_object.c"
-#include "selftests/i915_gem_coherency.c"
#include "selftests/i915_gem.c"
#endif
projects / platform / kernel / linux-starfive.git / blobdiff