* page faults in the source data
*/
-static inline int
-fast_user_write(struct io_mapping *mapping,
- loff_t page_base, int page_offset,
- char __user *user_data,
- int length)
+static inline bool
+ggtt_write(struct io_mapping *mapping,
+ loff_t base, int offset,
+ char __user *user_data, int length)
{
- void __iomem *vaddr_atomic;
void *vaddr;
unsigned long unwritten;
- vaddr_atomic = io_mapping_map_atomic_wc(mapping, page_base);
/* We can use the cpu mem copy function because this is X86. */
- vaddr = (void __force*)vaddr_atomic + page_offset;
- unwritten = __copy_from_user_inatomic_nocache(vaddr,
+ vaddr = (void __force *)io_mapping_map_atomic_wc(mapping, base);
+ unwritten = __copy_from_user_inatomic_nocache(vaddr + offset,
user_data, length);
- io_mapping_unmap_atomic(vaddr_atomic);
- return unwritten;
-}
-
-static inline unsigned long
-slow_user_access(struct io_mapping *mapping,
- unsigned long page_base, int page_offset,
- char __user *user_data,
- unsigned long length, bool pwrite)
-{
- void __iomem *ioaddr;
- void *vaddr;
- unsigned long unwritten;
-
- ioaddr = io_mapping_map_wc(mapping, page_base, PAGE_SIZE);
- /* We can use the cpu mem copy function because this is X86. */
- vaddr = (void __force *)ioaddr + page_offset;
- if (pwrite)
- unwritten = __copy_from_user(vaddr, user_data, length);
- else
- unwritten = __copy_to_user(user_data, vaddr, length);
+ io_mapping_unmap_atomic(vaddr);
+ if (unwritten) {
+ vaddr = (void __force *)
+ io_mapping_map_wc(mapping, base, PAGE_SIZE);
+ unwritten = copy_from_user(vaddr + offset, user_data, length);
+ io_mapping_unmap(vaddr);
+ }
- io_mapping_unmap(ioaddr);
return unwritten;
}
/**
* This is the fast pwrite path, where we copy the data directly from the
* user into the GTT, uncached.
- * @i915: i915 device private data
- * @obj: i915 gem object
+ * @obj: i915 GEM object
* @args: pwrite arguments structure
- * @file: drm file pointer
*/
static int
-i915_gem_gtt_pwrite_fast(struct drm_i915_private *i915,
- struct drm_i915_gem_object *obj,
- struct drm_i915_gem_pwrite *args,
- struct drm_file *file)
+i915_gem_gtt_pwrite_fast(struct drm_i915_gem_object *obj,
+ const struct drm_i915_gem_pwrite *args)
{
+ struct drm_i915_private *i915 = to_i915(obj->base.dev);
struct i915_ggtt *ggtt = &i915->ggtt;
- struct drm_device *dev = obj->base.dev;
- struct i915_vma *vma;
struct drm_mm_node node;
- uint64_t remain, offset;
- char __user *user_data;
+ struct i915_vma *vma;
+ u64 remain, offset;
+ void __user *user_data;
int ret;
- bool hit_slow_path = false;
- if (i915_gem_object_is_tiled(obj))
- return -EFAULT;
+ ret = mutex_lock_interruptible(&i915->drm.struct_mutex);
+ if (ret)
+ return ret;
intel_runtime_pm_get(i915);
vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
if (IS_ERR(vma)) {
ret = insert_mappable_node(ggtt, &node, PAGE_SIZE);
if (ret)
- goto out;
-
- ret = i915_gem_object_pin_pages(obj);
- if (ret) {
- remove_mappable_node(&node);
- goto out;
- }
+ goto out_unlock;
+ GEM_BUG_ON(!node.allocated);
}
ret = i915_gem_object_set_to_gtt_domain(obj, true);
if (ret)
goto out_unpin;
+ mutex_unlock(&i915->drm.struct_mutex);
+
intel_fb_obj_invalidate(obj, ORIGIN_CPU);
- obj->mm.dirty = true;
user_data = u64_to_user_ptr(args->data_ptr);
offset = args->offset;
* If the object is non-shmem backed, we retry again with the
* path that handles page fault.
*/
- if (fast_user_write(&ggtt->mappable, page_base,
- page_offset, user_data, page_length)) {
- hit_slow_path = true;
- mutex_unlock(&dev->struct_mutex);
- if (slow_user_access(&ggtt->mappable,
- page_base,
- page_offset, user_data,
- page_length, true)) {
- ret = -EFAULT;
- mutex_lock(&dev->struct_mutex);
- goto out_flush;
- }
-
- mutex_lock(&dev->struct_mutex);
+ if (ggtt_write(&ggtt->mappable, page_base, page_offset,
+ user_data, page_length)) {
+ ret = -EFAULT;
+ break;
}
remain -= page_length;
user_data += page_length;
offset += page_length;
}
-
-out_flush:
- if (hit_slow_path) {
- if (ret == 0 &&
- (obj->base.read_domains & I915_GEM_DOMAIN_GTT) == 0) {
- /* The user has modified the object whilst we tried
- * reading from it, and we now have no idea what domain
- * the pages should be in. As we have just been touching
- * them directly, flush everything back to the GTT
- * domain.
- */
- ret = i915_gem_object_set_to_gtt_domain(obj, false);
- }
- }
-
intel_fb_obj_flush(obj, false, ORIGIN_CPU);
+
+ mutex_lock(&i915->drm.struct_mutex);
out_unpin:
if (node.allocated) {
wmb();
ggtt->base.clear_range(&ggtt->base,
node.start, node.size);
- i915_gem_object_unpin_pages(obj);
remove_mappable_node(&node);
} else {
i915_vma_unpin(vma);
}
-out:
+out_unlock:
intel_runtime_pm_put(i915);
+ mutex_unlock(&i915->drm.struct_mutex);
return ret;
}
-/* Per-page copy function for the shmem pwrite fastpath.
- * Flushes invalid cachelines before writing to the target if
- * needs_clflush_before is set and flushes out any written cachelines after
- * writing if needs_clflush is set. */
static int
-shmem_pwrite_fast(struct page *page, int shmem_page_offset, int page_length,
- char __user *user_data,
- bool page_do_bit17_swizzling,
- bool needs_clflush_before,
- bool needs_clflush_after)
-{
- char *vaddr;
- int ret;
-
- if (unlikely(page_do_bit17_swizzling))
- return -EINVAL;
-
- vaddr = kmap_atomic(page);
- if (needs_clflush_before)
- drm_clflush_virt_range(vaddr + shmem_page_offset,
- page_length);
- ret = __copy_from_user_inatomic(vaddr + shmem_page_offset,
- user_data, page_length);
- if (needs_clflush_after)
- drm_clflush_virt_range(vaddr + shmem_page_offset,
- page_length);
- kunmap_atomic(vaddr);
-
- return ret ? -EFAULT : 0;
-}
-
-/* Only difference to the fast-path function is that this can handle bit17
- * and uses non-atomic copy and kmap functions. */
-static int
-shmem_pwrite_slow(struct page *page, int shmem_page_offset, int page_length,
+shmem_pwrite_slow(struct page *page, int offset, int length,
char __user *user_data,
bool page_do_bit17_swizzling,
bool needs_clflush_before,
vaddr = kmap(page);
if (unlikely(needs_clflush_before || page_do_bit17_swizzling))
- shmem_clflush_swizzled_range(vaddr + shmem_page_offset,
- page_length,
+ shmem_clflush_swizzled_range(vaddr + offset, length,
page_do_bit17_swizzling);
if (page_do_bit17_swizzling)
- ret = __copy_from_user_swizzled(vaddr, shmem_page_offset,
- user_data,
- page_length);
+ ret = __copy_from_user_swizzled(vaddr, offset, user_data,
+ length);
else
- ret = __copy_from_user(vaddr + shmem_page_offset,
- user_data,
- page_length);
+ ret = __copy_from_user(vaddr + offset, user_data, length);
if (needs_clflush_after)
- shmem_clflush_swizzled_range(vaddr + shmem_page_offset,
- page_length,
+ shmem_clflush_swizzled_range(vaddr + offset, length,
page_do_bit17_swizzling);
kunmap(page);
return ret ? -EFAULT : 0;
}
+/* Per-page copy function for the shmem pwrite fastpath.
+ * Flushes invalid cachelines before writing to the target if
+ * needs_clflush_before is set and flushes out any written cachelines after
+ * writing if needs_clflush is set.
+ */
static int
-i915_gem_shmem_pwrite(struct drm_device *dev,
- struct drm_i915_gem_object *obj,
- struct drm_i915_gem_pwrite *args,
- struct drm_file *file)
+shmem_pwrite(struct page *page, int offset, int len, char __user *user_data,
+ bool page_do_bit17_swizzling,
+ bool needs_clflush_before,
+ bool needs_clflush_after)
{
- ssize_t remain;
- loff_t offset;
- char __user *user_data;
- int shmem_page_offset, page_length, ret = 0;
- int obj_do_bit17_swizzling, page_do_bit17_swizzling;
- int hit_slowpath = 0;
+ int ret;
+
+ ret = -ENODEV;
+ if (!page_do_bit17_swizzling) {
+ char *vaddr = kmap_atomic(page);
+
+ if (needs_clflush_before)
+ drm_clflush_virt_range(vaddr + offset, len);
+ ret = __copy_from_user_inatomic(vaddr + offset, user_data, len);
+ if (needs_clflush_after)
+ drm_clflush_virt_range(vaddr + offset, len);
+
+ kunmap_atomic(vaddr);
+ }
+ if (ret == 0)
+ return ret;
+
+ return shmem_pwrite_slow(page, offset, len, user_data,
+ page_do_bit17_swizzling,
+ needs_clflush_before,
+ needs_clflush_after);
+}
+
+static int
+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 obj_do_bit17_swizzling;
+ unsigned int partial_cacheline_write;
unsigned int needs_clflush;
- struct sg_page_iter sg_iter;
+ unsigned int offset, idx;
+ int ret;
- ret = i915_gem_obj_prepare_shmem_write(obj, &needs_clflush);
+ ret = mutex_lock_interruptible(&i915->drm.struct_mutex);
if (ret)
return ret;
- obj_do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj);
- user_data = u64_to_user_ptr(args->data_ptr);
- offset = args->offset;
- remain = args->size;
+ ret = i915_gem_obj_prepare_shmem_write(obj, &needs_clflush);
+ mutex_unlock(&i915->drm.struct_mutex);
+ if (ret)
+ return ret;
- for_each_sg_page(obj->mm.pages->sgl, &sg_iter, obj->mm.pages->nents,
- offset >> PAGE_SHIFT) {
- struct page *page = sg_page_iter_page(&sg_iter);
- int partial_cacheline_write;
+ obj_do_bit17_swizzling = 0;
+ if (i915_gem_object_needs_bit17_swizzle(obj))
+ obj_do_bit17_swizzling = BIT(17);
- if (remain <= 0)
- break;
+ /* If we don't overwrite a cacheline completely we need to be
+ * careful to have up-to-date data by first clflushing. Don't
+ * overcomplicate things and flush the entire patch.
+ */
+ partial_cacheline_write = 0;
+ if (needs_clflush & CLFLUSH_BEFORE)
+ partial_cacheline_write = boot_cpu_data.x86_clflush_size - 1;
- /* Operation in this page
- *
- * shmem_page_offset = offset within page in shmem file
- * page_length = bytes to copy for this page
- */
- shmem_page_offset = offset_in_page(offset);
-
- page_length = remain;
- if ((shmem_page_offset + page_length) > PAGE_SIZE)
- page_length = PAGE_SIZE - shmem_page_offset;
-
- /* If we don't overwrite a cacheline completely we need to be
- * careful to have up-to-date data by first clflushing. Don't
- * overcomplicate things and flush the entire patch. */
- partial_cacheline_write = needs_clflush & CLFLUSH_BEFORE &&
- ((shmem_page_offset | page_length)
- & (boot_cpu_data.x86_clflush_size - 1));
-
- page_do_bit17_swizzling = obj_do_bit17_swizzling &&
- (page_to_phys(page) & (1 << 17)) != 0;
-
- ret = shmem_pwrite_fast(page, shmem_page_offset, page_length,
- user_data, page_do_bit17_swizzling,
- partial_cacheline_write,
- needs_clflush & CLFLUSH_AFTER);
- if (ret == 0)
- goto next_page;
-
- hit_slowpath = 1;
- mutex_unlock(&dev->struct_mutex);
- ret = shmem_pwrite_slow(page, shmem_page_offset, page_length,
- user_data, page_do_bit17_swizzling,
- partial_cacheline_write,
- needs_clflush & CLFLUSH_AFTER);
+ user_data = u64_to_user_ptr(args->data_ptr);
+ remain = args->size;
+ offset = offset_in_page(args->offset);
+ for (idx = args->offset >> PAGE_SHIFT; remain; idx++) {
+ struct page *page = i915_gem_object_get_page(obj, idx);
+ int length;
- mutex_lock(&dev->struct_mutex);
+ length = remain;
+ if (offset + length > PAGE_SIZE)
+ length = PAGE_SIZE - offset;
+ ret = shmem_pwrite(page, offset, length, user_data,
+ page_to_phys(page) & obj_do_bit17_swizzling,
+ (offset | length) & partial_cacheline_write,
+ needs_clflush & CLFLUSH_AFTER);
if (ret)
- goto out;
-
-next_page:
- remain -= page_length;
- user_data += page_length;
- offset += page_length;
- }
-
-out:
- i915_gem_obj_finish_shmem_access(obj);
+ break;
- if (hit_slowpath) {
- /*
- * Fixup: Flush cpu caches in case we didn't flush the dirty
- * cachelines in-line while writing and the object moved
- * out of the cpu write domain while we've dropped the lock.
- */
- if (!(needs_clflush & CLFLUSH_AFTER) &&
- obj->base.write_domain != I915_GEM_DOMAIN_CPU) {
- if (i915_gem_clflush_object(obj, obj->pin_display))
- needs_clflush |= CLFLUSH_AFTER;
- }
+ remain -= length;
+ user_data += length;
+ offset = 0;
}
- if (needs_clflush & CLFLUSH_AFTER)
- i915_gem_chipset_flush(to_i915(dev));
-
intel_fb_obj_flush(obj, false, ORIGIN_CPU);
+ i915_gem_obj_finish_shmem_access(obj);
return ret;
}
i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
struct drm_file *file)
{
- struct drm_i915_private *dev_priv = to_i915(dev);
struct drm_i915_gem_pwrite *args = data;
struct drm_i915_gem_object *obj;
int ret;
args->size))
return -EFAULT;
- if (likely(!i915.prefault_disable)) {
- ret = fault_in_pages_readable(u64_to_user_ptr(args->data_ptr),
- args->size);
- if (ret)
- return -EFAULT;
- }
-
obj = i915_gem_object_lookup(file, args->handle);
if (!obj)
return -ENOENT;
if (ret)
goto err;
- intel_runtime_pm_get(dev_priv);
-
- ret = i915_mutex_lock_interruptible(dev);
+ ret = i915_gem_object_pin_pages(obj);
if (ret)
- goto err_rpm;
+ goto err;
ret = -EFAULT;
/* We can only do the GTT pwrite on untiled buffers, as otherwise
* pointers (e.g. gtt mappings when moving data between
* textures). Fallback to the shmem path in that case.
*/
- ret = i915_gem_gtt_pwrite_fast(dev_priv, obj, args, file);
+ ret = i915_gem_gtt_pwrite_fast(obj, args);
if (ret == -EFAULT || ret == -ENOSPC) {
if (obj->phys_handle)
ret = i915_gem_phys_pwrite(obj, args, file);
else
- ret = i915_gem_shmem_pwrite(dev, obj, args, file);
+ ret = i915_gem_shmem_pwrite(obj, args);
}
- i915_gem_object_put(obj);
- mutex_unlock(&dev->struct_mutex);
- intel_runtime_pm_put(dev_priv);
-
- return ret;
-
-err_rpm:
- intel_runtime_pm_put(dev_priv);
+ i915_gem_object_unpin_pages(obj);
err:
i915_gem_object_put_unlocked(obj);
return ret;
projects / linux.git / commitdiff