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drm/i915: Use non-atomic kmap for slow copy paths 

As we do not have a requirement to be atomic and avoid sleeping whilst
performing the slow copy for shmem based pread and pwrite, we can use
kmap instead, thus simplifying the code.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Chris Wilson 2010-05-27 14:15:34 +01:00 committed by Eric Anholt
parent 9b8c4a0b21
commit 99a03df57c
1 changed files with 30 additions and 52 deletions
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82
drivers/gpu/drm/i915/i915_gem.c
View File

@ -167,7 +167,7 @@ static int i915_gem_object_needs_bit17_swizzle(struct drm_gem_object *obj)
obj_priv->tiling_mode != I915_TILING_NONE;
}
static inline int
static inline void
slow_shmem_copy(struct page *dst_page,
int dst_offset,
struct page *src_page,
@ -176,25 +176,16 @@ slow_shmem_copy(struct page *dst_page,
{
char *dst_vaddr, *src_vaddr;
dst_vaddr = kmap_atomic(dst_page, KM_USER0);
if (dst_vaddr == NULL)
return -ENOMEM;
src_vaddr = kmap_atomic(src_page, KM_USER1);
if (src_vaddr == NULL) {
kunmap_atomic(dst_vaddr, KM_USER0);
return -ENOMEM;
}
dst_vaddr = kmap(dst_page);
src_vaddr = kmap(src_page);
memcpy(dst_vaddr + dst_offset, src_vaddr + src_offset, length);
kunmap_atomic(src_vaddr, KM_USER1);
kunmap_atomic(dst_vaddr, KM_USER0);
return 0;
kunmap(src_page);
kunmap(dst_page);
}
static inline int
static inline void
slow_shmem_bit17_copy(struct page *gpu_page,
int gpu_offset,
struct page *cpu_page,
@ -214,15 +205,8 @@ slow_shmem_bit17_copy(struct page *gpu_page,
cpu_page, cpu_offset, length);
}
gpu_vaddr = kmap_atomic(gpu_page, KM_USER0);
if (gpu_vaddr == NULL)
return -ENOMEM;
cpu_vaddr = kmap_atomic(cpu_page, KM_USER1);
if (cpu_vaddr == NULL) {
kunmap_atomic(gpu_vaddr, KM_USER0);
return -ENOMEM;
}
gpu_vaddr = kmap(gpu_page);
cpu_vaddr = kmap(cpu_page);
/* Copy the data, XORing A6 with A17 (1). The user already knows he's
* XORing with the other bits (A9 for Y, A9 and A10 for X)
@ -246,10 +230,8 @@ slow_shmem_bit17_copy(struct page *gpu_page,
length -= this_length;
}
kunmap_atomic(cpu_vaddr, KM_USER1);
kunmap_atomic(gpu_vaddr, KM_USER0);
return 0;
kunmap(cpu_page);
kunmap(gpu_page);
}
/**
@ -425,21 +407,19 @@ i915_gem_shmem_pread_slow(struct drm_device *dev, struct drm_gem_object *obj,
page_length = PAGE_SIZE - data_page_offset;
if (do_bit17_swizzling) {
ret = slow_shmem_bit17_copy(obj_priv->pages[shmem_page_index],
shmem_page_offset,
user_pages[data_page_index],
data_page_offset,
page_length,
1);
} else {
ret = slow_shmem_copy(user_pages[data_page_index],
data_page_offset,
obj_priv->pages[shmem_page_index],
slow_shmem_bit17_copy(obj_priv->pages[shmem_page_index],
shmem_page_offset,
page_length);
user_pages[data_page_index],
data_page_offset,
page_length,
1);
} else {
slow_shmem_copy(user_pages[data_page_index],
data_page_offset,
obj_priv->pages[shmem_page_index],
shmem_page_offset,
page_length);
}
if (ret)
goto fail_put_pages;
remain -= page_length;
data_ptr += page_length;
@ -900,21 +880,19 @@ i915_gem_shmem_pwrite_slow(struct drm_device *dev, struct drm_gem_object *obj,
page_length = PAGE_SIZE - data_page_offset;
if (do_bit17_swizzling) {
ret = slow_shmem_bit17_copy(obj_priv->pages[shmem_page_index],
shmem_page_offset,
user_pages[data_page_index],
data_page_offset,
page_length,
0);
} else {
ret = slow_shmem_copy(obj_priv->pages[shmem_page_index],
slow_shmem_bit17_copy(obj_priv->pages[shmem_page_index],
shmem_page_offset,
user_pages[data_page_index],
data_page_offset,
page_length);
page_length,
0);
} else {
slow_shmem_copy(obj_priv->pages[shmem_page_index],
shmem_page_offset,
user_pages[data_page_index],
data_page_offset,
page_length);
}
if (ret)
goto fail_put_pages;
remain -= page_length;
data_ptr += page_length;