Some kernel internal objects may need to be allocated as a contiguous
block, also thinking ahead the various kernel io_mapping interfaces seem
to expect it, although this is purely a limitation in the kernel
API...so perhaps something to be improved.
Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Cc: Abdiel Janulgue <abdiel.janulgue@xxxxxxxxxxxxxxx>
Cc: Michael J Ruhl <michael.j.ruhl@xxxxxxxxx>
---
drivers/gpu/drm/i915/gem/i915_gem_object.h | 6 +
.../gpu/drm/i915/gem/i915_gem_object_types.h | 4 +
drivers/gpu/drm/i915/gem/i915_gem_region.c | 15 +-
drivers/gpu/drm/i915/gem/i915_gem_region.h | 3 +-
.../gpu/drm/i915/gem/selftests/huge_pages.c | 71 ++++----
drivers/gpu/drm/i915/intel_memory_region.c | 9 +-
drivers/gpu/drm/i915/intel_memory_region.h | 3 +-
.../drm/i915/selftests/intel_memory_region.c | 165 ++++++++++++++++++
drivers/gpu/drm/i915/selftests/mock_region.c | 2 +-
9 files changed, 239 insertions(+), 39 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h
index 086a9bf5adcc..dfd16d65630f 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h
@@ -139,6 +139,12 @@ i915_gem_object_is_readonly(const struct drm_i915_gem_object *obj)
return obj->base.vma_node.readonly;
}
+static inline bool
+i915_gem_object_is_contiguous(const struct drm_i915_gem_object *obj)
+{
+ return obj->flags & I915_BO_ALLOC_CONTIGUOUS;
+}
+
static inline bool
i915_gem_object_type_has(const struct drm_i915_gem_object *obj,
unsigned long flags)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
index 11390586cfe1..c6a712cf7d7a 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
@@ -119,6 +119,10 @@ struct drm_i915_gem_object {
I915_SELFTEST_DECLARE(struct list_head st_link);
+ unsigned long flags;
+#define I915_BO_ALLOC_CONTIGUOUS BIT(0)
+#define I915_BO_ALLOC_FLAGS (I915_BO_ALLOC_CONTIGUOUS)
+
/*
* Is the object to be mapped as read-only to the GPU
* Only honoured if hardware has relevant pte bit
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_region.c b/drivers/gpu/drm/i915/gem/i915_gem_region.c
index fad3a94641e9..89708b3fa03d 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_region.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_region.c
@@ -23,10 +23,10 @@ i915_gem_object_get_pages_buddy(struct drm_i915_gem_object *obj)
{
struct intel_memory_region *mem = obj->mm.region;
struct list_head *blocks = &obj->mm.blocks;
- unsigned int flags = I915_ALLOC_MIN_PAGE_SIZE;
resource_size_t size = obj->base.size;
resource_size_t prev_end;
struct i915_buddy_block *block;
+ unsigned int flags;
struct sg_table *st;
struct scatterlist *sg;
unsigned int sg_page_sizes;
@@ -41,6 +41,10 @@ i915_gem_object_get_pages_buddy(struct drm_i915_gem_object *obj)
return -ENOMEM;
}
+ flags = I915_ALLOC_MIN_PAGE_SIZE;
+ if (obj->flags & I915_BO_ALLOC_CONTIGUOUS)
+ flags |= I915_ALLOC_CONTIGUOUS;
+
ret = __intel_memory_region_get_pages_buddy(mem, size, flags, blocks);
if (ret)
goto err_free_sg;
@@ -55,7 +59,8 @@ i915_gem_object_get_pages_buddy(struct drm_i915_gem_object *obj)
list_for_each_entry(block, blocks, link) {
u64 block_size, offset;
- block_size = i915_buddy_block_size(&mem->mm, block);
+ block_size = min_t(u64, size,
+ i915_buddy_block_size(&mem->mm, block));
offset = i915_buddy_block_offset(block);
GEM_BUG_ON(overflows_type(block_size, sg->length));
@@ -96,10 +101,12 @@ i915_gem_object_get_pages_buddy(struct drm_i915_gem_object *obj)
}
void i915_gem_object_init_memory_region(struct drm_i915_gem_object *obj,
- struct intel_memory_region *mem)
+ struct intel_memory_region *mem,
+ unsigned long flags)
{
INIT_LIST_HEAD(&obj->mm.blocks);
obj->mm.region = intel_memory_region_get(mem);
+ obj->flags |= flags;
}
void i915_gem_object_release_memory_region(struct drm_i915_gem_object *obj)
@@ -120,6 +127,8 @@ i915_gem_object_create_region(struct intel_memory_region *mem,
* future.
*/
+ GEM_BUG_ON(flags & ~I915_BO_ALLOC_FLAGS);
+
if (!mem)
return ERR_PTR(-ENODEV);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_region.h b/drivers/gpu/drm/i915/gem/i915_gem_region.h
index ebddc86d78f7..f2ff6f8bff74 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_region.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_region.h
@@ -17,7 +17,8 @@ void i915_gem_object_put_pages_buddy(struct drm_i915_gem_object *obj,
struct sg_table *pages);
void i915_gem_object_init_memory_region(struct drm_i915_gem_object *obj,
- struct intel_memory_region *mem);
+ struct intel_memory_region *mem,
+ unsigned long flags);
void i915_gem_object_release_memory_region(struct drm_i915_gem_object *obj);
struct drm_i915_gem_object *
diff --git a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
index b4c390e9fa50..63a4743e5f54 100644
--- a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
+++ b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
@@ -456,6 +456,7 @@ static int igt_mock_exhaust_device_supported_pages(void *arg)
static int igt_mock_memory_region_huge_pages(void *arg)
{
+ const unsigned int flags[] = { 0, I915_BO_ALLOC_CONTIGUOUS };
struct i915_ppgtt *ppgtt = arg;
struct drm_i915_private *i915 = ppgtt->vm.i915;
unsigned long supported = INTEL_INFO(i915)->page_sizes;
@@ -474,46 +475,52 @@ static int igt_mock_memory_region_huge_pages(void *arg)
for_each_set_bit(bit, &supported, ilog2(I915_GTT_MAX_PAGE_SIZE) + 1) {
unsigned int page_size = BIT(bit);
resource_size_t phys;
+ int i;
- obj = i915_gem_object_create_region(mem, page_size, 0);
- if (IS_ERR(obj)) {
- err = PTR_ERR(obj);
- goto out_region;
- }
+ for (i = 0; i < ARRAY_SIZE(flags); ++i) {
+ obj = i915_gem_object_create_region(mem, page_size,
+ flags[i]);
+ if (IS_ERR(obj)) {
+ err = PTR_ERR(obj);
+ goto out_region;
+ }
- vma = i915_vma_instance(obj, &ppgtt->vm, NULL);
- if (IS_ERR(vma)) {
- err = PTR_ERR(vma);
- goto out_put;
- }
+ vma = i915_vma_instance(obj, &ppgtt->vm, NULL);
+ if (IS_ERR(vma)) {
+ err = PTR_ERR(vma);
+ goto out_put;
+ }
- err = i915_vma_pin(vma, 0, 0, PIN_USER);
- if (err)
- goto out_close;
+ err = i915_vma_pin(vma, 0, 0, PIN_USER);
+ if (err)
+ goto out_close;
- err = igt_check_page_sizes(vma);
- if (err)
- goto out_unpin;
+ err = igt_check_page_sizes(vma);
+ if (err)
+ goto out_unpin;
- phys = i915_gem_object_get_dma_address(obj, 0);
- if (!IS_ALIGNED(phys, page_size)) {
- pr_err("%s addr misaligned(%pa) page_size=%u\n",
- __func__, &phys, page_size);
- err = -EINVAL;
- goto out_unpin;
- }
+ phys = i915_gem_object_get_dma_address(obj, 0);
+ if (!IS_ALIGNED(phys, page_size)) {
+ pr_err("%s addr misaligned(%pa) page_size=%u\n",
+ __func__, &phys, page_size);
+ err = -EINVAL;
+ goto out_unpin;
+ }
- if (vma->page_sizes.gtt != page_size) {
- pr_err("%s page_sizes.gtt=%u, expected=%u\n",
- __func__, vma->page_sizes.gtt, page_size);
- err = -EINVAL;
- goto out_unpin;
- }
+ if (vma->page_sizes.gtt != page_size) {
+ pr_err("%s page_sizes.gtt=%u, expected=%u\n",
+ __func__, vma->page_sizes.gtt,
+ page_size);
+ err = -EINVAL;
+ goto out_unpin;
+ }
- i915_vma_unpin(vma);
- i915_vma_close(vma);
+ i915_vma_unpin(vma);
+ i915_vma_close(vma);
- i915_gem_object_put(obj);
+ __i915_gem_object_put_pages(obj, I915_MM_NORMAL);
+ i915_gem_object_put(obj);
+ }
}
goto out_region;
diff --git a/drivers/gpu/drm/i915/intel_memory_region.c b/drivers/gpu/drm/i915/intel_memory_region.c
index 2ef67c397fca..98006618e871 100644
--- a/drivers/gpu/drm/i915/intel_memory_region.c
+++ b/drivers/gpu/drm/i915/intel_memory_region.c
@@ -47,8 +47,8 @@ __intel_memory_region_get_pages_buddy(struct intel_memory_region *mem,
unsigned int flags,
struct list_head *blocks)
{
- unsigned long n_pages = size >> ilog2(mem->mm.chunk_size);
unsigned int min_order = 0;
+ unsigned long n_pages;
GEM_BUG_ON(!IS_ALIGNED(size, mem->mm.chunk_size));
GEM_BUG_ON(!list_empty(blocks));
@@ -58,6 +58,13 @@ __intel_memory_region_get_pages_buddy(struct intel_memory_region *mem,
ilog2(mem->mm.chunk_size);
}
+ if (flags & I915_ALLOC_CONTIGUOUS) {
+ size = roundup_pow_of_two(size);
+ min_order = ilog2(size) - ilog2(mem->mm.chunk_size);
+ }
+
+ n_pages = size >> ilog2(mem->mm.chunk_size);
+
mutex_lock(&mem->mm_lock);
do {
diff --git a/drivers/gpu/drm/i915/intel_memory_region.h b/drivers/gpu/drm/i915/intel_memory_region.h
index 2ea17d6c31ed..29b86ca17dd9 100644
--- a/drivers/gpu/drm/i915/intel_memory_region.h
+++ b/drivers/gpu/drm/i915/intel_memory_region.h
@@ -18,7 +18,8 @@ struct drm_i915_gem_object;
struct intel_memory_region;
struct sg_table;
-#define I915_ALLOC_MIN_PAGE_SIZE BIT(0)
+#define I915_ALLOC_MIN_PAGE_SIZE BIT(0)
+#define I915_ALLOC_CONTIGUOUS BIT(1)
struct intel_memory_region_ops {
unsigned int flags;
diff --git a/drivers/gpu/drm/i915/selftests/intel_memory_region.c b/drivers/gpu/drm/i915/selftests/intel_memory_region.c
index 53f4f2d9f655..f3394888e019 100644
--- a/drivers/gpu/drm/i915/selftests/intel_memory_region.c
+++ b/drivers/gpu/drm/i915/selftests/intel_memory_region.c
@@ -13,6 +13,7 @@
#include "gem/i915_gem_region.h"
#include "gem/selftests/mock_context.h"
+#include "selftests/i915_random.h"
static void close_objects(struct intel_memory_region *mem,
struct list_head *objects)
@@ -86,10 +87,174 @@ static int igt_mock_fill(void *arg)
return err;
}
+static struct drm_i915_gem_object *
+igt_object_create(struct intel_memory_region *mem,
+ struct list_head *objects,
+ u64 size,
+ unsigned int flags)
+{
+ struct drm_i915_gem_object *obj;
+ int err;
+
+ obj = i915_gem_object_create_region(mem, size, flags);
+ if (IS_ERR(obj))
+ return obj;
+
+ err = i915_gem_object_pin_pages(obj);
+ if (err)
+ goto put;
+
+ list_add(&obj->st_link, objects);
+ return obj;
+
+put:
+ i915_gem_object_put(obj);
+ return ERR_PTR(err);
+}
+
+static void igt_object_release(struct drm_i915_gem_object *obj)
+{
+ i915_gem_object_unpin_pages(obj);
+ __i915_gem_object_put_pages(obj, I915_MM_NORMAL);
+ list_del(&obj->st_link);
+ i915_gem_object_put(obj);
+}
+
+static int igt_mock_contiguous(void *arg)
+{
+ struct intel_memory_region *mem = arg;
+ struct drm_i915_gem_object *obj;
+ unsigned long n_objects;
+ LIST_HEAD(objects);
+ LIST_HEAD(holes);
+ I915_RND_STATE(prng);
+ resource_size_t target;
+ resource_size_t total;
+ resource_size_t min;
+ int err = 0;
+
+ total = resource_size(&mem->region);
+
+ /* Min size */
+ obj = igt_object_create(mem, &objects, mem->mm.chunk_size,
+ I915_BO_ALLOC_CONTIGUOUS);
+ if (IS_ERR(obj))
+ return PTR_ERR(obj);
+
+ if (obj->mm.pages->nents != 1) {
+ pr_err("%s min object spans multiple sg entries\n", __func__);
+ err = -EINVAL;
+ goto err_close_objects;
+ }
+
+ igt_object_release(obj);
+
+ /* Max size */
+ obj = igt_object_create(mem, &objects, total, I915_BO_ALLOC_CONTIGUOUS);
+ if (IS_ERR(obj))
+ return PTR_ERR(obj);
+
+ if (obj->mm.pages->nents != 1) {
+ pr_err("%s max object spans multiple sg entries\n", __func__);
+ err = -EINVAL;
+ goto err_close_objects;
+ }
+
+ igt_object_release(obj);
+
+ /* Internal fragmentation should not bleed into the object size */
+ target = round_up(prandom_u32_state(&prng) % total, PAGE_SIZE);
+ target = max_t(u64, PAGE_SIZE, target);
+
+ obj = igt_object_create(mem, &objects, target,
+ I915_BO_ALLOC_CONTIGUOUS);
+ if (IS_ERR(obj))
+ return PTR_ERR(obj);
+
+ if (obj->base.size != target) {
+ pr_err("%s obj->base.size(%llx) != target(%llx)\n", __func__,
+ (u64)obj->base.size, (u64)target);
+ err = -EINVAL;
+ goto err_close_objects;
+ }
+
+ if (obj->mm.pages->nents != 1) {
+ pr_err("%s object spans multiple sg entries\n", __func__);
+ err = -EINVAL;
+ goto err_close_objects;
+ }
+
+ igt_object_release(obj);
+
+ /*
+ * Try to fragment the address space, such that half of it is free, but
+ * the max contiguous block size is SZ_64K.
+ */
+
+ target = SZ_64K;
+ n_objects = div64_u64(total, target);
+
+ while (n_objects--) {
+ struct list_head *list;
+
+ if (n_objects % 2)
+ list = &holes;
+ else
+ list = &objects;
+
+ obj = igt_object_create(mem, list, target,
+ I915_BO_ALLOC_CONTIGUOUS);
+ if (IS_ERR(obj)) {
+ err = PTR_ERR(obj);
+ goto err_close_objects;
+ }
+ }
+
+ close_objects(mem, &holes);
+
+ min = target;
+ target = total >> 1;
+
+ /* Make sure we can still allocate all the fragmented space */
+ obj = igt_object_create(mem, &objects, target, 0);
+ if (IS_ERR(obj)) {
+ err = PTR_ERR(obj);
+ goto err_close_objects;
+ }
+
+ igt_object_release(obj);
+
+ /*
+ * Even though we have enough free space, we don't have a big enough
+ * contiguous block. Make sure that holds true.
+ */
+
+ do {
+ bool should_fail = target > min;
+
+ obj = igt_object_create(mem, &objects, target,
+ I915_BO_ALLOC_CONTIGUOUS);
+ if (should_fail != IS_ERR(obj)) {
+ pr_err("%s target allocation(%llx) mismatch\n",
+ __func__, (u64)target);
+ err = -EINVAL;
+ goto err_close_objects;
+ }
+
+ target >>= 1;
+ } while (target >= mem->mm.chunk_size);
+
+err_close_objects:
+ list_splice_tail(&holes, &objects);
+ close_objects(mem, &objects);
+ return err;
+}
+
int intel_memory_region_mock_selftests(void)
{
static const struct i915_subtest tests[] = {
SUBTEST(igt_mock_fill),
+ SUBTEST(igt_mock_contiguous),
};
struct intel_memory_region *mem;
struct drm_i915_private *i915;
diff --git a/drivers/gpu/drm/i915/selftests/mock_region.c b/drivers/gpu/drm/i915/selftests/mock_region.c
index 0e9a575ede3b..7b0c99ddc2d5 100644
--- a/drivers/gpu/drm/i915/selftests/mock_region.c
+++ b/drivers/gpu/drm/i915/selftests/mock_region.c
@@ -36,7 +36,7 @@ mock_object_create(struct intel_memory_region *mem,
i915_gem_object_set_cache_coherency(obj, I915_CACHE_NONE);
- i915_gem_object_init_memory_region(obj, mem);
+ i915_gem_object_init_memory_region(obj, mem, flags);
return obj;
}
--
2.20.1
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