--- /dev/null
+/*
+ * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#include "drmP.h"
+#include "drm.h"
+#include "i915_drm.h"
+#include "i915_drv.h"
+
+struct i915_relocatee_info {
+ struct drm_buffer_object *buf;
+ unsigned long offset;
+ uint32_t *data_page;
+ unsigned page_offset;
+ struct drm_bo_kmap_obj kmap;
+ int is_iomem;
+ int idle;
+ int dst;
+#ifdef DRM_KMAP_ATOMIC_PROT_PFN
+ unsigned long pfn;
+ pgprot_t pg_prot;
+#endif
+};
+
+struct drm_i915_validate_buffer {
+ struct drm_buffer_object *buffer;
+ struct drm_bo_info_rep rep;
+ int presumed_offset_correct;
+ void __user *data;
+ int ret;
+};
+
+
+static int i915_update_relocatee(struct i915_relocatee_info *relocatee,
+ struct drm_i915_validate_buffer *buffers,
+ unsigned int dst,
+ unsigned long dst_offset)
+{
+ int ret;
+
+ if (unlikely(dst != relocatee->dst || NULL == relocatee->buf)) {
+ i915_clear_relocatee(relocatee);
+ relocatee->dst = dst;
+ relocatee->buf = buffers[dst].buffer;
+ preempt_enable();
+ ret = mutex_lock_interruptible(&relocatee->buf->mutex);
+ preempt_disable();
+ if (unlikely(ret))
+ return -EAGAIN;
+
+ ret = drm_bo_wait(relocatee->buf, 0, 0, 0);
+ if (unlikely(ret))
+ return ret;
+
+ mutex_unlock(&relocatee->buf->mutex);
+ }
+
+ if (unlikely(dst_offset > relocatee->buf->num_pages * PAGE_SIZE)) {
+ DRM_ERROR("Relocation destination out of bounds.\n");
+ return -EINVAL;
+ }
+ if (unlikely(!drm_bo_same_page(relocatee->page_offset, dst_offset) ||
+ NULL == relocatee->data_page)) {
+#ifdef DRM_KMAP_ATOMIC_PROT_PFN
+ if (NULL != relocatee->data_page) {
+ kunmap_atomic(relocatee->data_page, KM_USER0);
+ relocatee->data_page = NULL;
+ }
+ ret = drm_bo_pfn_prot(relocatee->buf, dst_offset,
+ &relocatee->pfn,
+ &relocatee->pg_prot);
+ if (ret) {
+ DRM_ERROR("Can't map relocation destination.\n");
+ return -EINVAL;
+ }
+ relocatee->data_page =
+ kmap_atomic_prot_pfn(relocatee->pfn, KM_USER0,
+ relocatee->pg_prot);
+#else
+ if (NULL != relocatee->data_page) {
+ drm_bo_kunmap(&relocatee->kmap);
+ relocatee->data_page = NULL;
+ }
+
+ ret = drm_bo_kmap(relocatee->buf, dst_offset >> PAGE_SHIFT,
+ 1, &relocatee->kmap);
+ if (ret) {
+ DRM_ERROR("Can't map relocation destination.\n");
+ return ret;
+ }
+
+ relocatee->data_page = drm_bmo_virtual(&relocatee->kmap,
+ &relocatee->is_iomem);
+#endif
+ relocatee->page_offset = dst_offset & PAGE_MASK;
+ }
+ return 0;
+}
+
+
+static void i915_dereference_buffers_locked(struct drm_i915_validate_buffer *buffers,
+ unsigned num_buffers)
+{
+ while (num_buffers--)
+ drm_bo_usage_deref_locked(&buffers[num_buffers].buffer);
+}
+
+int i915_apply_reloc(struct drm_file *file_priv, int num_buffers,
+ struct drm_i915_validate_buffer *buffers,
+ struct i915_relocatee_info *relocatee,
+ uint32_t *reloc)
+{
+ unsigned index;
+ unsigned long new_cmd_offset;
+ u32 val;
+ int ret, i;
+ int buf_index = -1;
+
+ /*
+ * FIXME: O(relocs * buffers) complexity.
+ */
+
+ for (i = 0; i <= num_buffers; i++)
+ if (buffers[i].buffer)
+ if (reloc[2] == buffers[i].buffer->base.hash.key)
+ buf_index = i;
+
+ if (buf_index == -1) {
+ DRM_ERROR("Illegal relocation buffer %08X\n", reloc[2]);
+ return -EINVAL;
+ }
+
+ /*
+ * Short-circuit relocations that were correctly
+ * guessed by the client
+ */
+ if (buffers[buf_index].presumed_offset_correct && !DRM_DEBUG_RELOCATION)
+ return 0;
+
+ new_cmd_offset = reloc[0];
+ if (!relocatee->data_page ||
+ !drm_bo_same_page(relocatee->offset, new_cmd_offset)) {
+ drm_bo_kunmap(&relocatee->kmap);
+ relocatee->data_page = NULL;
+ relocatee->offset = new_cmd_offset;
+
+ /*
+ * Note on buffer idle:
+ * Since we're applying relocations, this part of the
+ * buffer is obviously not used by the GPU and we don't
+ * need to wait for buffer idle. This is an important
+ * consideration for user-space buffer pools.
+ */
+
+ ret = drm_bo_kmap(relocatee->buf, new_cmd_offset >> PAGE_SHIFT,
+ 1, &relocatee->kmap);
+ if (ret) {
+ DRM_ERROR("Could not map command buffer to apply relocs\n %08lx", new_cmd_offset);
+ return ret;
+ }
+ relocatee->data_page = drm_bmo_virtual(&relocatee->kmap,
+ &relocatee->is_iomem);
+ relocatee->page_offset = (relocatee->offset & PAGE_MASK);
+ }
+
+ val = buffers[buf_index].buffer->offset;
+ index = (reloc[0] - relocatee->page_offset) >> 2;
+
+ /* add in validate */
+ val = val + reloc[1];
+
+ if (DRM_DEBUG_RELOCATION) {
+ if (buffers[buf_index].presumed_offset_correct &&
+ relocatee->data_page[index] != val) {
+ DRM_DEBUG ("Relocation mismatch source %d target %d buffer %d user %08x kernel %08x\n",
+ reloc[0], reloc[1], buf_index, relocatee->data_page[index], val);
+ }
+ }
+
+ if (relocatee->is_iomem)
+ iowrite32(val, relocatee->data_page + index);
+ else
+ relocatee->data_page[index] = val;
+ return 0;
+}
+
+int i915_process_relocs(struct drm_file *file_priv,
+ uint32_t buf_handle,
+ uint32_t __user **reloc_user_ptr,
+ struct i915_relocatee_info *relocatee,
+ struct drm_i915_validate_buffer *buffers,
+ uint32_t num_buffers)
+{
+ int ret, reloc_stride;
+ uint32_t cur_offset;
+ uint32_t reloc_count;
+ uint32_t reloc_type;
+ uint32_t reloc_buf_size;
+ uint32_t *reloc_buf = NULL;
+ int i;
+
+ /* do a copy from user from the user ptr */
+ ret = get_user(reloc_count, *reloc_user_ptr);
+ if (ret) {
+ DRM_ERROR("Could not map relocation buffer.\n");
+ goto out;
+ }
+
+ ret = get_user(reloc_type, (*reloc_user_ptr)+1);
+ if (ret) {
+ DRM_ERROR("Could not map relocation buffer.\n");
+ goto out;
+ }
+
+ if (reloc_type != 0) {
+ DRM_ERROR("Unsupported relocation type requested\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ reloc_buf_size = (I915_RELOC_HEADER + (reloc_count * I915_RELOC0_STRIDE)) * sizeof(uint32_t);
+ reloc_buf = kmalloc(reloc_buf_size, GFP_KERNEL);
+ if (!reloc_buf) {
+ DRM_ERROR("Out of memory for reloc buffer\n");
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ if (copy_from_user(reloc_buf, *reloc_user_ptr, reloc_buf_size)) {
+ ret = -EFAULT;
+ goto out;
+ }
+
+ /* get next relocate buffer handle */
+ *reloc_user_ptr = (uint32_t *)*(unsigned long *)&reloc_buf[2];
+
+ reloc_stride = I915_RELOC0_STRIDE * sizeof(uint32_t); /* may be different for other types of relocs */
+
+ DRM_DEBUG("num relocs is %d, next is %p\n", reloc_count, *reloc_user_ptr);
+
+ for (i = 0; i < reloc_count; i++) {
+ cur_offset = I915_RELOC_HEADER + (i * I915_RELOC0_STRIDE);
+
+ ret = i915_apply_reloc(file_priv, num_buffers, buffers,
+ relocatee, reloc_buf + cur_offset);
+ if (ret)
+ goto out;
+ }
+
+out:
+ if (reloc_buf)
+ kfree(reloc_buf);
+
+ if (relocatee->data_page) {
+ drm_bo_kunmap(&relocatee->kmap);
+ relocatee->data_page = NULL;
+ }
+
+ return ret;
+}
+
+static int i915_exec_reloc(struct drm_file *file_priv, drm_handle_t buf_handle,
+ uint32_t __user *reloc_user_ptr,
+ struct drm_i915_validate_buffer *buffers,
+ uint32_t buf_count)
+{
+ struct drm_device *dev = file_priv->head->dev;
+ struct i915_relocatee_info relocatee;
+ int ret = 0;
+ int b;
+
+ /*
+ * Short circuit relocations when all previous
+ * buffers offsets were correctly guessed by
+ * the client
+ */
+ if (!DRM_DEBUG_RELOCATION) {
+ for (b = 0; b < buf_count; b++)
+ if (!buffers[b].presumed_offset_correct)
+ break;
+
+ if (b == buf_count)
+ return 0;
+ }
+
+ memset(&relocatee, 0, sizeof(relocatee));
+
+ mutex_lock(&dev->struct_mutex);
+ relocatee.buf = drm_lookup_buffer_object(file_priv, buf_handle, 1);
+ mutex_unlock(&dev->struct_mutex);
+ if (!relocatee.buf) {
+ DRM_DEBUG("relocatee buffer invalid %08x\n", buf_handle);
+ ret = -EINVAL;
+ goto out_err;
+ }
+
+ mutex_lock (&relocatee.buf->mutex);
+ while (reloc_user_ptr) {
+ ret = i915_process_relocs(file_priv, buf_handle, &reloc_user_ptr, &relocatee, buffers, buf_count);
+ if (ret) {
+ DRM_ERROR("process relocs failed\n");
+ goto out_err1;
+ }
+ }
+
+out_err1:
+ mutex_unlock (&relocatee.buf->mutex);
+ drm_bo_usage_deref_unlocked(&relocatee.buf);
+out_err:
+ return ret;
+}
+
+static int i915_check_presumed(struct drm_i915_op_arg *arg,
+ struct drm_buffer_object *bo,
+ uint32_t __user *data,
+ int *presumed_ok)
+{
+ struct drm_bo_op_req *req = &arg->d.req;
+ uint32_t hint_offset;
+ uint32_t hint = req->bo_req.hint;
+
+ *presumed_ok = 0;
+
+ if (!(hint & DRM_BO_HINT_PRESUMED_OFFSET))
+ return 0;
+ if (bo->offset == req->bo_req.presumed_offset) {
+ *presumed_ok = 1;
+ return 0;
+ }
+
+ /*
+ * We need to turn off the HINT_PRESUMED_OFFSET for this buffer in
+ * the user-space IOCTL argument list, since the buffer has moved,
+ * we're about to apply relocations and we might subsequently
+ * hit an -EAGAIN. In that case the argument list will be reused by
+ * user-space, but the presumed offset is no longer valid.
+ *
+ * Needless to say, this is a bit ugly.
+ */
+
+ hint_offset = (uint32_t *)&req->bo_req.hint - (uint32_t *)arg;
+ hint &= ~DRM_BO_HINT_PRESUMED_OFFSET;
+ return __put_user(hint, data + hint_offset);
+}
+
+
+/*
+ * Validate, add fence and relocate a block of bos from a userspace list
+ */
+int i915_validate_buffer_list(struct drm_file *file_priv,
+ unsigned int fence_class, uint64_t data,
+ struct drm_i915_validate_buffer *buffers,
+ uint32_t *num_buffers)
+{
+ struct drm_i915_op_arg arg;
+ struct drm_bo_op_req *req = &arg.d.req;
+ int ret = 0;
+ unsigned buf_count = 0;
+ uint32_t buf_handle;
+ uint32_t __user *reloc_user_ptr;
+ struct drm_i915_validate_buffer *item = buffers;
+
+ do {
+ if (buf_count >= *num_buffers) {
+ DRM_ERROR("Buffer count exceeded %d\n.", *num_buffers);
+ ret = -EINVAL;
+ goto out_err;
+ }
+ item = buffers + buf_count;
+ item->buffer = NULL;
+ item->presumed_offset_correct = 0;
+
+ buffers[buf_count].buffer = NULL;
+
+ if (copy_from_user(&arg, (void __user *)(unsigned long)data, sizeof(arg))) {
+ ret = -EFAULT;
+ goto out_err;
+ }
+
+ ret = 0;
+ if (req->op != drm_bo_validate) {
+ DRM_ERROR
+ ("Buffer object operation wasn't \"validate\".\n");
+ ret = -EINVAL;
+ goto out_err;
+ }
+ item->ret = 0;
+ item->data = (void __user *) (unsigned long) data;
+
+ buf_handle = req->bo_req.handle;
+ reloc_user_ptr = (uint32_t *)(unsigned long)arg.reloc_ptr;
+
+ if (reloc_user_ptr) {
+ ret = i915_exec_reloc(file_priv, buf_handle, reloc_user_ptr, buffers, buf_count);
+ if (ret)
+ goto out_err;
+ DRM_MEMORYBARRIER();
+ }
+
+ ret = drm_bo_handle_validate(file_priv, req->bo_req.handle,
+ req->bo_req.flags, req->bo_req.mask,
+ req->bo_req.hint,
+ req->bo_req.fence_class, 0,
+ &item->rep,
+ &item->buffer);
+
+ if (ret) {
+ DRM_ERROR("error on handle validate %d\n", ret);
+ goto out_err;
+ }
+
+ buf_count++;
+
+ ret = i915_check_presumed(&arg, item->buffer,
+ (uint32_t __user *)
+ (unsigned long) data,
+ &item->presumed_offset_correct);
+ if (ret)
+ goto out_err;
+
+ data = arg.next;
+ } while (data != 0);
+out_err:
+ *num_buffers = buf_count;
+ item->ret = (ret != -EAGAIN) ? ret : 0;
+ return ret;
+}
+
+
+/*
+ * Remove all buffers from the unfenced list.
+ * If the execbuffer operation was aborted, for example due to a signal,
+ * this also make sure that buffers retain their original state and
+ * fence pointers.
+ * Copy back buffer information to user-space unless we were interrupted
+ * by a signal. In which case the IOCTL must be rerun.
+ */
+
+static int i915_handle_copyback(struct drm_device *dev,
+ struct drm_i915_validate_buffer *buffers,
+ unsigned int num_buffers, int ret)
+{
+ int err = ret;
+ int i;
+ struct drm_i915_op_arg arg;
+
+ if (ret)
+ drm_putback_buffer_objects(dev);
+
+ if (ret != -EAGAIN) {
+ for (i = 0; i < num_buffers; ++i) {
+ arg.handled = 1;
+ arg.d.rep.ret = buffers->ret;
+ arg.d.rep.bo_info = buffers->rep;
+ if (__copy_to_user(buffers->data, &arg, sizeof(arg)))
+ err = -EFAULT;
+ buffers++;
+ }
+ }
+
+ return err;
+}
+
+/*
+ * Create a fence object, and if that fails, pretend that everything is
+ * OK and just idle the GPU.
+ */
+
+void i915_fence_or_sync(struct drm_file *file_priv,
+ uint32_t fence_flags,
+ struct drm_fence_arg *fence_arg,
+ struct drm_fence_object **fence_p)
+{
+ struct drm_device *dev = file_priv->head->dev;
+ int ret;
+ struct drm_fence_object *fence;
+
+ ret = drm_fence_buffer_objects(dev, NULL, fence_flags,
+ NULL, &fence);
+
+ if (ret) {
+
+ /*
+ * Fence creation failed.
+ * Fall back to synchronous operation and idle the engine.
+ */
+
+ (void) i915_emit_mi_flush(dev, MI_READ_FLUSH);
+ (void) i915_quiescent(dev);
+
+ if (!(fence_flags & DRM_FENCE_FLAG_NO_USER)) {
+
+ /*
+ * Communicate to user-space that
+ * fence creation has failed and that
+ * the engine is idle.
+ */
+
+ fence_arg->handle = ~0;
+ fence_arg->error = ret;
+ }
+
+ drm_putback_buffer_objects(dev);
+ if (fence_p)
+ *fence_p = NULL;
+ return;
+ }
+
+ if (!(fence_flags & DRM_FENCE_FLAG_NO_USER)) {
+
+ ret = drm_fence_add_user_object(file_priv, fence,
+ fence_flags &
+ DRM_FENCE_FLAG_SHAREABLE);
+ if (!ret)
+ drm_fence_fill_arg(fence, fence_arg);
+ else {
+ /*
+ * Fence user object creation failed.
+ * We must idle the engine here as well, as user-
+ * space expects a fence object to wait on. Since we
+ * have a fence object we wait for it to signal
+ * to indicate engine "sufficiently" idle.
+ */
+
+ (void) drm_fence_object_wait(fence, 0, 1,
+ fence->type);
+ drm_fence_usage_deref_unlocked(&fence);
+ fence_arg->handle = ~0;
+ fence_arg->error = ret;
+ }
+ }
+
+ if (fence_p)
+ *fence_p = fence;
+ else if (fence)
+ drm_fence_usage_deref_unlocked(&fence);
+}
+
+
+static int i915_execbuffer(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
+ drm_i915_sarea_t *sarea_priv = (drm_i915_sarea_t *)
+ dev_priv->sarea_priv;
+ struct drm_i915_execbuffer *exec_buf = data;
+ struct drm_i915_batchbuffer *batch = &exec_buf->batch;
+ struct drm_fence_arg *fence_arg = &exec_buf->fence_arg;
+ int num_buffers;
+ int ret;
+ struct drm_i915_validate_buffer *buffers;
+
+ if (!dev_priv->allow_batchbuffer) {
+ DRM_ERROR("Batchbuffer ioctl disabled\n");
+ return -EINVAL;
+ }
+
+
+ if (batch->num_cliprects && DRM_VERIFYAREA_READ(batch->cliprects,
+ batch->num_cliprects *
+ sizeof(struct drm_clip_rect)))
+ return -EFAULT;
+
+ if (exec_buf->num_buffers > dev_priv->max_validate_buffers)
+ return -EINVAL;
+
+
+ ret = drm_bo_read_lock(&dev->bm.bm_lock);
+ if (ret)
+ return ret;
+
+ /*
+ * The cmdbuf_mutex makes sure the validate-submit-fence
+ * operation is atomic.
+ */
+
+ ret = mutex_lock_interruptible(&dev_priv->cmdbuf_mutex);
+ if (ret) {
+ drm_bo_read_unlock(&dev->bm.bm_lock);
+ return -EAGAIN;
+ }
+
+ num_buffers = exec_buf->num_buffers;
+
+ buffers = drm_calloc(num_buffers, sizeof(struct drm_i915_validate_buffer), DRM_MEM_DRIVER);
+ if (!buffers) {
+ drm_bo_read_unlock(&dev->bm.bm_lock);
+ mutex_unlock(&dev_priv->cmdbuf_mutex);
+ return -ENOMEM;
+ }
+
+ /* validate buffer list + fixup relocations */
+ ret = i915_validate_buffer_list(file_priv, 0, exec_buf->ops_list,
+ buffers, &num_buffers);
+ if (ret)
+ goto out_err0;
+
+ /* make sure all previous memory operations have passed */
+ DRM_MEMORYBARRIER();
+ drm_agp_chipset_flush(dev);
+
+ /* submit buffer */
+ batch->start = buffers[num_buffers-1].buffer->offset;
+
+ DRM_DEBUG("i915 exec batchbuffer, start %x used %d cliprects %d\n",
+ batch->start, batch->used, batch->num_cliprects);
+
+ ret = i915_dispatch_batchbuffer(dev, batch);
+ if (ret)
+ goto out_err0;
+
+ if (sarea_priv)
+ sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
+
+ i915_fence_or_sync(file_priv, fence_arg->flags, fence_arg, NULL);
+
+out_err0:
+
+ /* handle errors */
+ ret = i915_handle_copyback(dev, buffers, num_buffers, ret);
+ mutex_lock(&dev->struct_mutex);
+ i915_dereference_buffers_locked(buffers, num_buffers);
+ mutex_unlock(&dev->struct_mutex);
+
+ drm_free(buffers, (exec_buf->num_buffers * sizeof(struct drm_buffer_object *)), DRM_MEM_DRIVER);
+
+ mutex_unlock(&dev_priv->cmdbuf_mutex);
+ drm_bo_read_unlock(&dev->bm.bm_lock);
+ return ret;
+}
+#endif
projects / platform / upstream / libdrm.git / commitdiff