[04/24] drm/i915: Pin backing pages for pread

Commit Message

Chris Wilson Sept. 4, 2012, 8:02 p.m. UTC

By using the recently introduced pinning of pages, we can safely drop
the mutex in the knowledge that the pages are not going to disappear
beneath us, and so we can simplify the code for iterating over the pages.

Signed-off-by: Chris Wilson <[e-mail]>
---
 drivers/gpu/drm/i915/i915_gem.c |   36 +++++++++++++-----------------------
 1 file changed, 13 insertions(+), 23 deletions(-)

Comments

Ben Widawsky Sept. 7, 2012, 12:10 a.m. UTC | #1

On Tue,  4 Sep 2012 21:02:56 +0100
Chris Wilson <[e-mail]> wrote:

> By using the recently introduced pinning of pages, we can safely drop
> the mutex in the knowledge that the pages are not going to disappear
> beneath us, and so we can simplify the code for iterating over the pages.
> 
> Signed-off-by: Chris Wilson <[e-mail]>
If you fix patch3 to explain, it explain here too. Write is always
scarier for me anyway. With fixed patch 3, it's
Reviewed-by: Ben Widawsky <[e-mail]>

Patch

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 8a4eac0..171bc51 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -343,7 +343,7 @@  shmem_pread_fast(struct page *page, int shmem_page_offset, int page_length,
 				      page_length);
 	kunmap_atomic(vaddr);
 
-	return ret;
+	return ret ? -EFAULT : 0;
 }
 
 static void
@@ -394,7 +394,7 @@  shmem_pread_slow(struct page *page, int shmem_page_offset, int page_length,
 				     page_length);
 	kunmap(page);
 
-	return ret;
+	return ret ? - EFAULT : 0;
 }
 
 static int
@@ -403,7 +403,6 @@  i915_gem_shmem_pread(struct drm_device *dev,
 		     struct drm_i915_gem_pread *args,
 		     struct drm_file *file)
 {
-	struct address_space *mapping = obj->base.filp->f_path.dentry->d_inode->i_mapping;
 	char __user *user_data;
 	ssize_t remain;
 	loff_t offset;
@@ -412,7 +411,6 @@  i915_gem_shmem_pread(struct drm_device *dev,
 	int hit_slowpath = 0;
 	int prefaulted = 0;
 	int needs_clflush = 0;
-	int release_page;
 
 	user_data = (char __user *) (uintptr_t) args->data_ptr;
 	remain = args->size;
@@ -433,6 +431,12 @@  i915_gem_shmem_pread(struct drm_device *dev,
 		}
 	}
 
+	ret = i915_gem_object_get_pages(obj);
+	if (ret)
+		return ret;
+
+	i915_gem_object_pin_pages(obj);
+
 	offset = args->offset;
 
 	while (remain > 0) {
@@ -448,18 +452,7 @@  i915_gem_shmem_pread(struct drm_device *dev,
 		if ((shmem_page_offset + page_length) > PAGE_SIZE)
 			page_length = PAGE_SIZE - shmem_page_offset;
 
-		if (obj->pages) {
-			page = obj->pages[offset >> PAGE_SHIFT];
-			release_page = 0;
-		} else {
-			page = shmem_read_mapping_page(mapping, offset >> PAGE_SHIFT);
-			if (IS_ERR(page)) {
-				ret = PTR_ERR(page);
-				goto out;
-			}
-			release_page = 1;
-		}
-
+		page = obj->pages[offset >> PAGE_SHIFT];
 		page_do_bit17_swizzling = obj_do_bit17_swizzling &&
 			(page_to_phys(page) & (1 << 17)) != 0;
 
@@ -470,7 +463,6 @@  i915_gem_shmem_pread(struct drm_device *dev,
 			goto next_page;
 
 		hit_slowpath = 1;
-		page_cache_get(page);
 		mutex_unlock(&dev->struct_mutex);
 
 		if (!prefaulted) {
@@ -488,16 +480,12 @@  i915_gem_shmem_pread(struct drm_device *dev,
 				       needs_clflush);
 
 		mutex_lock(&dev->struct_mutex);
-		page_cache_release(page);
+
 next_page:
 		mark_page_accessed(page);
-		if (release_page)
-			page_cache_release(page);
 
-		if (ret) {
-			ret = -EFAULT;
+		if (ret)
 			goto out;
-		}
 
 		remain -= page_length;
 		user_data += page_length;
@@ -505,6 +493,8 @@  next_page:
 	}
 
 out:
+	i915_gem_object_unpin_pages(obj);
+
 	if (hit_slowpath) {
 		/* Fixup: Kill any reinstated backing storage pages */
 		if (obj->madv == __I915_MADV_PURGED)