struct panfrost_gem_object *bo = to_panfrost_bo(obj);
struct panfrost_device *pfdev = obj->dev->dev_private;
+ if (bo->sgts) {
+ int i;
+ int n_sgt = bo->base.base.size / SZ_2M;
+
+ for (i = 0; i < n_sgt; i++) {
+ if (bo->sgts[i].sgl) {
+ dma_unmap_sg(pfdev->dev, bo->sgts[i].sgl,
+ bo->sgts[i].nents, DMA_BIDIRECTIONAL);
+ sg_free_table(&bo->sgts[i]);
+ }
+ }
+ kfree(bo->sgts);
+ }
+
mutex_lock(&pfdev->shrinker_lock);
if (!list_empty(&bo->base.madv_list))
list_del(&bo->base.madv_list);
if (ret)
goto out;
- ret = panfrost_mmu_map(bo);
- if (ret)
- drm_mm_remove_node(&bo->node);
-
+ if (!bo->is_heap) {
+ ret = panfrost_mmu_map(bo);
+ if (ret)
+ drm_mm_remove_node(&bo->node);
+ }
out:
spin_unlock(&pfdev->mm_lock);
return ret;
spin_unlock(&pfdev->mm_lock);
}
+static int panfrost_gem_pin(struct drm_gem_object *obj)
+{
+ if (to_panfrost_bo(obj)->is_heap)
+ return -EINVAL;
+
+ return drm_gem_shmem_pin(obj);
+}
+
static const struct drm_gem_object_funcs panfrost_gem_funcs = {
.free = panfrost_gem_free_object,
.open = panfrost_gem_open,
.close = panfrost_gem_close,
.print_info = drm_gem_shmem_print_info,
- .pin = drm_gem_shmem_pin,
+ .pin = panfrost_gem_pin,
.unpin = drm_gem_shmem_unpin,
.get_sg_table = drm_gem_shmem_get_sg_table,
.vmap = drm_gem_shmem_vmap,
struct drm_gem_shmem_object *shmem;
struct panfrost_gem_object *bo;
+ /* Round up heap allocations to 2MB to keep fault handling simple */
+ if (flags & PANFROST_BO_HEAP)
+ size = roundup(size, SZ_2M);
+
shmem = drm_gem_shmem_create(dev, size);
if (IS_ERR(shmem))
return ERR_CAST(shmem);
bo = to_panfrost_bo(&shmem->base);
bo->noexec = !!(flags & PANFROST_BO_NOEXEC);
+ bo->is_heap = !!(flags & PANFROST_BO_HEAP);
/*
* Allocate an id of idr table where the obj is registered
/* Copyright 2019 Linaro, Ltd, Rob Herring <robh@kernel.org> */
#include <linux/bitfield.h>
#include <linux/delay.h>
+#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/iommu.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
+#include <linux/shmem_fs.h>
#include <linux/sizes.h>
#include "panfrost_device.h"
size_t unmapped_page;
size_t pgsize = get_pgsize(iova, len - unmapped_len);
- unmapped_page = ops->unmap(ops, iova, pgsize);
- if (!unmapped_page)
- break;
-
- iova += unmapped_page;
- unmapped_len += unmapped_page;
+ if (ops->iova_to_phys(ops, iova)) {
+ unmapped_page = ops->unmap(ops, iova, pgsize);
+ WARN_ON(unmapped_page != pgsize);
+ }
+ iova += pgsize;
+ unmapped_len += pgsize;
}
mmu_hw_do_operation(pfdev, 0, bo->node.start << PAGE_SHIFT,
.tlb_sync = mmu_tlb_sync_context,
};
+static struct drm_mm_node *addr_to_drm_mm_node(struct panfrost_device *pfdev, int as, u64 addr)
+{
+ struct drm_mm_node *node;
+ u64 offset = addr >> PAGE_SHIFT;
+
+ drm_mm_for_each_node(node, &pfdev->mm) {
+ if (offset >= node->start && offset < (node->start + node->size))
+ return node;
+ }
+ return NULL;
+}
+
+#define NUM_FAULT_PAGES (SZ_2M / PAGE_SIZE)
+
+int panfrost_mmu_map_fault_addr(struct panfrost_device *pfdev, int as, u64 addr)
+{
+ int ret, i;
+ struct drm_mm_node *node;
+ struct panfrost_gem_object *bo;
+ struct address_space *mapping;
+ pgoff_t page_offset;
+ struct sg_table *sgt;
+ struct page **pages;
+
+ node = addr_to_drm_mm_node(pfdev, as, addr);
+ if (!node)
+ return -ENOENT;
+
+ bo = drm_mm_node_to_panfrost_bo(node);
+ if (!bo->is_heap) {
+ dev_WARN(pfdev->dev, "matching BO is not heap type (GPU VA = %llx)",
+ node->start << PAGE_SHIFT);
+ return -EINVAL;
+ }
+ /* Assume 2MB alignment and size multiple */
+ addr &= ~((u64)SZ_2M - 1);
+ page_offset = addr >> PAGE_SHIFT;
+ page_offset -= node->start;
+
+ mutex_lock(&bo->base.pages_lock);
+
+ if (!bo->base.pages) {
+ bo->sgts = kvmalloc_array(bo->base.base.size / SZ_2M,
+ sizeof(struct sg_table), GFP_KERNEL | __GFP_ZERO);
+ if (!bo->sgts)
+ return -ENOMEM;
+
+ pages = kvmalloc_array(bo->base.base.size >> PAGE_SHIFT,
+ sizeof(struct page *), GFP_KERNEL | __GFP_ZERO);
+ if (!pages) {
+ kfree(bo->sgts);
+ bo->sgts = NULL;
+ return -ENOMEM;
+ }
+ bo->base.pages = pages;
+ bo->base.pages_use_count = 1;
+ } else
+ pages = bo->base.pages;
+
+ mapping = bo->base.base.filp->f_mapping;
+ mapping_set_unevictable(mapping);
+
+ for (i = page_offset; i < page_offset + NUM_FAULT_PAGES; i++) {
+ pages[i] = shmem_read_mapping_page(mapping, i);
+ if (IS_ERR(pages[i])) {
+ mutex_unlock(&bo->base.pages_lock);
+ ret = PTR_ERR(pages[i]);
+ goto err_pages;
+ }
+ }
+
+ mutex_unlock(&bo->base.pages_lock);
+
+ sgt = &bo->sgts[page_offset / (SZ_2M / PAGE_SIZE)];
+ ret = sg_alloc_table_from_pages(sgt, pages + page_offset,
+ NUM_FAULT_PAGES, 0, SZ_2M, GFP_KERNEL);
+ if (ret)
+ goto err_pages;
+
+ if (!dma_map_sg(pfdev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL)) {
+ ret = -EINVAL;
+ goto err_map;
+ }
+
+ mmu_map_sg(pfdev, addr, IOMMU_WRITE | IOMMU_READ | IOMMU_NOEXEC, sgt);
+
+ bo->is_mapped = true;
+
+ dev_dbg(pfdev->dev, "mapped page fault @ %llx", addr);
+
+ return 0;
+
+err_map:
+ sg_free_table(sgt);
+err_pages:
+ drm_gem_shmem_put_pages(&bo->base);
+ return ret;
+}
+
static const char *access_type_name(struct panfrost_device *pfdev,
u32 fault_status)
{
{
struct panfrost_device *pfdev = data;
u32 status = mmu_read(pfdev, MMU_INT_RAWSTAT);
- int i;
-
- dev_err(pfdev->dev, "mmu irq status=%x\n", status);
+ int i, ret;
for (i = 0; status; i++) {
u32 mask = BIT(i) | BIT(i + 16);
access_type = (fault_status >> 8) & 0x3;
source_id = (fault_status >> 16);
+ /* Page fault only */
+ if ((status & mask) == BIT(i)) {
+ WARN_ON(exception_type < 0xC1 || exception_type > 0xC4);
+
+ ret = panfrost_mmu_map_fault_addr(pfdev, i, addr);
+ if (!ret) {
+ mmu_write(pfdev, MMU_INT_CLEAR, BIT(i));
+ status &= ~mask;
+ continue;
+ }
+ }
+
/* terminal fault, print info about the fault */
dev_err(pfdev->dev,
"Unhandled Page fault in AS%d at VA 0x%016llX\n"
projects / platform / kernel / linux-rpi.git / commitdiff