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drm/i915: Fix DMA mapped scatterlist lookup

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As the previous patch fixed the places where we walk the whole scatterlist
for DMA addresses, this patch fixes the random lookup functionality.

To achieve this we have to add a second lookup iterator and add a
i915_gem_object_get_sg_dma helper, to be used analoguous to existing
i915_gem_object_get_sg_dma. Therefore two lookup caches are maintained per
object and they are flushed at the same point for simplicity. (Strictly
speaking the DMA cache should be flushed from i915_gem_gtt_finish_pages,
but today this conincides with unsetting of the pages in general.)

Partial VMA view is then fixed to use the new DMA lookup and properly
query sg length.

v2:
 * Checkpatch.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Lu Baolu <baolu.lu@linux.intel.com>
Cc: Tom Murphy <murphyt7@tcd.ie>
Cc: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20201006092508.1064287-2-tvrtko.ursulin@linux.intel.com
This commit is contained in:
Tvrtko Ursulin 2020-10-06 10:25:08 +01:00
parent 8a473dbadc
commit 934941ed5a
6 changed files with 51 additions and 18 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/gpu/drm/i915/gem/i915_gem_object.c
View file

@ -73,6 +73,8 @@ void i915_gem_object_init(struct drm_i915_gem_object *obj,
obj->mm.madv = I915_MADV_WILLNEED;
INIT_RADIX_TREE(&obj->mm.get_page.radix, GFP_KERNEL | __GFP_NOWARN);
mutex_init(&obj->mm.get_page.lock);
INIT_RADIX_TREE(&obj->mm.get_dma_page.radix, GFP_KERNEL | __GFP_NOWARN);
mutex_init(&obj->mm.get_dma_page.lock);
if (IS_ENABLED(CONFIG_LOCKDEP) && i915_gem_object_is_shrinkable(obj))
i915_gem_shrinker_taints_mutex(to_i915(obj->base.dev),

20
drivers/gpu/drm/i915/gem/i915_gem_object.h
View file

@ -275,8 +275,26 @@ int i915_gem_object_set_tiling(struct drm_i915_gem_object *obj,
unsigned int tiling, unsigned int stride);
struct scatterlist *
__i915_gem_object_get_sg(struct drm_i915_gem_object *obj,
struct i915_gem_object_page_iter *iter,
unsigned int n,
unsigned int *offset);
static inline struct scatterlist *
i915_gem_object_get_sg(struct drm_i915_gem_object *obj,
unsigned int n, unsigned int *offset);
unsigned int n,
unsigned int *offset)
{
return __i915_gem_object_get_sg(obj, &obj->mm.get_page, n, offset);
}
static inline struct scatterlist *
i915_gem_object_get_sg_dma(struct drm_i915_gem_object *obj,
unsigned int n,
unsigned int *offset)
{
return __i915_gem_object_get_sg(obj, &obj->mm.get_dma_page, n, offset);
}
struct page *
i915_gem_object_get_page(struct drm_i915_gem_object *obj,

17
drivers/gpu/drm/i915/gem/i915_gem_object_types.h
View file

@ -80,6 +80,14 @@ struct i915_mmap_offset {
struct rb_node offset;
};
struct i915_gem_object_page_iter {
struct scatterlist *sg_pos;
unsigned int sg_idx; /* in pages, but 32bit eek! */
struct radix_tree_root radix;
struct mutex lock; /* protects this cache */
};
struct drm_i915_gem_object {
struct drm_gem_object base;
@ -246,13 +254,8 @@ struct drm_i915_gem_object {
I915_SELFTEST_DECLARE(unsigned int page_mask);
struct i915_gem_object_page_iter {
struct scatterlist *sg_pos;
unsigned int sg_idx; /* in pages, but 32bit eek! */
struct radix_tree_root radix;
struct mutex lock; /* protects this cache */
} get_page;
struct i915_gem_object_page_iter get_page;
struct i915_gem_object_page_iter get_dma_page;
/**
* Element within i915->mm.unbound_list or i915->mm.bound_list,

21
drivers/gpu/drm/i915/gem/i915_gem_pages.c
View file

@ -33,6 +33,8 @@ void __i915_gem_object_set_pages(struct drm_i915_gem_object *obj,
obj->mm.get_page.sg_pos = pages->sgl;
obj->mm.get_page.sg_idx = 0;
obj->mm.get_dma_page.sg_pos = pages->sgl;
obj->mm.get_dma_page.sg_idx = 0;
obj->mm.pages = pages;
@ -155,6 +157,8 @@ static void __i915_gem_object_reset_page_iter(struct drm_i915_gem_object *obj)
rcu_read_lock();
radix_tree_for_each_slot(slot, &obj->mm.get_page.radix, &iter, 0)
radix_tree_delete(&obj->mm.get_page.radix, iter.index);
radix_tree_for_each_slot(slot, &obj->mm.get_dma_page.radix, &iter, 0)
radix_tree_delete(&obj->mm.get_dma_page.radix, iter.index);
rcu_read_unlock();
}
@ -450,11 +454,12 @@ void __i915_gem_object_release_map(struct drm_i915_gem_object *obj)
}
struct scatterlist *
i915_gem_object_get_sg(struct drm_i915_gem_object *obj,
unsigned int n,
unsigned int *offset)
__i915_gem_object_get_sg(struct drm_i915_gem_object *obj,
struct i915_gem_object_page_iter *iter,
unsigned int n,
unsigned int *offset)
{
struct i915_gem_object_page_iter *iter = &obj->mm.get_page;
const bool dma = iter == &obj->mm.get_dma_page;
struct scatterlist *sg;
unsigned int idx, count;
@ -483,7 +488,7 @@ i915_gem_object_get_sg(struct drm_i915_gem_object *obj,
sg = iter->sg_pos;
idx = iter->sg_idx;
count = __sg_page_count(sg);
count = dma ? __sg_dma_page_count(sg) : __sg_page_count(sg);
while (idx + count <= n) {
void *entry;
@ -511,7 +516,7 @@ i915_gem_object_get_sg(struct drm_i915_gem_object *obj,
idx += count;
sg = ____sg_next(sg);
count = __sg_page_count(sg);
count = dma ? __sg_dma_page_count(sg) : __sg_page_count(sg);
}
scan:
@ -529,7 +534,7 @@ i915_gem_object_get_sg(struct drm_i915_gem_object *obj,
while (idx + count <= n) {
idx += count;
sg = ____sg_next(sg);
count = __sg_page_count(sg);
count = dma ? __sg_dma_page_count(sg) : __sg_page_count(sg);
}
*offset = n - idx;
@ -582,7 +587,7 @@ i915_gem_object_get_dma_address_len(struct drm_i915_gem_object *obj,
struct scatterlist *sg;
unsigned int offset;
sg = i915_gem_object_get_sg(obj, n, &offset);
sg = i915_gem_object_get_sg_dma(obj, n, &offset);
if (len)
*len = sg_dma_len(sg) - (offset << PAGE_SHIFT);

4
drivers/gpu/drm/i915/gt/intel_ggtt.c
View file

@ -1383,7 +1383,7 @@ intel_partial_pages(const struct i915_ggtt_view *view,
if (ret)
goto err_sg_alloc;
iter = i915_gem_object_get_sg(obj, view->partial.offset, &offset);
iter = i915_gem_object_get_sg_dma(obj, view->partial.offset, &offset);
GEM_BUG_ON(!iter);
sg = st->sgl;
@ -1391,7 +1391,7 @@ intel_partial_pages(const struct i915_ggtt_view *view,
do {
unsigned int len;
len = min(iter->length - (offset << PAGE_SHIFT),
len = min(sg_dma_len(iter) - (offset << PAGE_SHIFT),
count << PAGE_SHIFT);
sg_set_page(sg, NULL, len, 0);
sg_dma_address(sg) =

5
drivers/gpu/drm/i915/i915_scatterlist.h
View file

@ -48,6 +48,11 @@ static inline int __sg_page_count(const struct scatterlist *sg)
return sg->length >> PAGE_SHIFT;
}
static inline int __sg_dma_page_count(const struct scatterlist *sg)
{
return sg_dma_len(sg) >> PAGE_SHIFT;
}
static inline struct scatterlist *____sg_next(struct scatterlist *sg)
{
++sg;