From 0ff375759f64a0b81853d9d9b4c5b5b4b06f4a2c Mon Sep 17 00:00:00 2001 From: =?utf8?q?Thomas=20Hellstr=C3=B6m?= Date: Thu, 24 Jun 2021 10:42:38 +0200 Subject: [PATCH] drm/i915: Update object placement flags to be mutable MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The object ops i915_GEM_OBJECT_HAS_IOMEM and the object I915_BO_ALLOC_STRUCT_PAGE flags are considered immutable by much of our code. Introduce a new mem_flags member to hold these and make sure checks for these flags being set are either done under the object lock or with pages properly pinned. The flags will change during migration under the object lock. Signed-off-by: Thomas Hellström Reviewed-by: Matthew Auld Signed-off-by: Matthew Auld Link: https://patchwork.freedesktop.org/patch/msgid/20210624084240.270219-2-thomas.hellstrom@linux.intel.com --- drivers/gpu/drm/i915/gem/i915_gem_internal.c | 4 +- drivers/gpu/drm/i915/gem/i915_gem_lmem.c | 22 +++++++++++ drivers/gpu/drm/i915/gem/i915_gem_lmem.h | 2 + drivers/gpu/drm/i915/gem/i915_gem_mman.c | 12 +++--- drivers/gpu/drm/i915/gem/i915_gem_object.c | 38 +++++++++++++++++++ drivers/gpu/drm/i915/gem/i915_gem_object.h | 14 ++----- .../gpu/drm/i915/gem/i915_gem_object_types.h | 27 ++++++++----- drivers/gpu/drm/i915/gem/i915_gem_pages.c | 2 +- drivers/gpu/drm/i915/gem/i915_gem_phys.c | 2 +- drivers/gpu/drm/i915/gem/i915_gem_shmem.c | 7 ++-- drivers/gpu/drm/i915/gem/i915_gem_ttm.c | 2 +- drivers/gpu/drm/i915/gem/i915_gem_userptr.c | 4 +- .../drm/i915/gem/selftests/huge_gem_object.c | 4 +- .../gpu/drm/i915/gem/selftests/huge_pages.c | 5 +-- .../drm/i915/gem/selftests/i915_gem_mman.c | 25 ++++++++---- .../drm/i915/gem/selftests/i915_gem_phys.c | 3 +- drivers/gpu/drm/i915/i915_gpu_error.c | 2 +- 17 files changed, 123 insertions(+), 52 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_internal.c b/drivers/gpu/drm/i915/gem/i915_gem_internal.c index ce6b664b10aa5..13b217f750555 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_internal.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_internal.c @@ -177,8 +177,8 @@ i915_gem_object_create_internal(struct drm_i915_private *i915, return ERR_PTR(-ENOMEM); drm_gem_private_object_init(&i915->drm, &obj->base, size); - i915_gem_object_init(obj, &i915_gem_object_internal_ops, &lock_class, - I915_BO_ALLOC_STRUCT_PAGE); + i915_gem_object_init(obj, &i915_gem_object_internal_ops, &lock_class, 0); + obj->mem_flags |= I915_BO_FLAG_STRUCT_PAGE; /* * Mark the object as volatile, such that the pages are marked as diff --git a/drivers/gpu/drm/i915/gem/i915_gem_lmem.c b/drivers/gpu/drm/i915/gem/i915_gem_lmem.c index d539dffa15547..41d5182cd3676 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_lmem.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_lmem.c @@ -71,6 +71,28 @@ bool i915_gem_object_is_lmem(struct drm_i915_gem_object *obj) mr->type == INTEL_MEMORY_STOLEN_LOCAL); } +/** + * __i915_gem_object_is_lmem - Whether the object is resident in + * lmem while in the fence signaling critical path. + * @obj: The object to check. + * + * This function is intended to be called from within the fence signaling + * path where the fence keeps the object from being migrated. For example + * during gpu reset or similar. + * + * Return: Whether the object is resident in lmem. + */ +bool __i915_gem_object_is_lmem(struct drm_i915_gem_object *obj) +{ + struct intel_memory_region *mr = READ_ONCE(obj->mm.region); + +#ifdef CONFIG_LOCKDEP + GEM_WARN_ON(dma_resv_test_signaled(obj->base.resv, true)); +#endif + return mr && (mr->type == INTEL_MEMORY_LOCAL || + mr->type == INTEL_MEMORY_STOLEN_LOCAL); +} + struct drm_i915_gem_object * i915_gem_object_create_lmem(struct drm_i915_private *i915, resource_size_t size, diff --git a/drivers/gpu/drm/i915/gem/i915_gem_lmem.h b/drivers/gpu/drm/i915/gem/i915_gem_lmem.h index ea76fd11ccb0c..27a611deba47f 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_lmem.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_lmem.h @@ -21,6 +21,8 @@ i915_gem_object_lmem_io_map(struct drm_i915_gem_object *obj, bool i915_gem_object_is_lmem(struct drm_i915_gem_object *obj); +bool __i915_gem_object_is_lmem(struct drm_i915_gem_object *obj); + struct drm_i915_gem_object * i915_gem_object_create_lmem(struct drm_i915_private *i915, resource_size_t size, diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/i915_gem_mman.c index 2fd155742bd2b..6497a2dbdab97 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_mman.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.c @@ -684,7 +684,7 @@ __assign_mmap_offset(struct drm_i915_gem_object *obj, if (mmap_type != I915_MMAP_TYPE_GTT && !i915_gem_object_has_struct_page(obj) && - !i915_gem_object_type_has(obj, I915_GEM_OBJECT_HAS_IOMEM)) + !i915_gem_object_has_iomem(obj)) return -ENODEV; mmo = mmap_offset_attach(obj, mmap_type, file); @@ -708,7 +708,12 @@ __assign_mmap_offset_handle(struct drm_file *file, if (!obj) return -ENOENT; + err = i915_gem_object_lock_interruptible(obj, NULL); + if (err) + goto out_put; err = __assign_mmap_offset(obj, mmap_type, offset, file); + i915_gem_object_unlock(obj); +out_put: i915_gem_object_put(obj); return err; } @@ -932,10 +937,7 @@ int i915_gem_mmap(struct file *filp, struct vm_area_struct *vma) return PTR_ERR(anon); } - vma->vm_flags |= VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP; - - if (i915_gem_object_has_iomem(obj)) - vma->vm_flags |= VM_IO; + vma->vm_flags |= VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP | VM_IO; /* * We keep the ref on mmo->obj, not vm_file, but we require diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.c b/drivers/gpu/drm/i915/gem/i915_gem_object.c index cf18c430d51fa..07e8ff9a8aaef 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_object.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_object.c @@ -475,6 +475,44 @@ bool i915_gem_object_migratable(struct drm_i915_gem_object *obj) return obj->mm.n_placements > 1; } +/** + * i915_gem_object_has_struct_page - Whether the object is page-backed + * @obj: The object to query. + * + * This function should only be called while the object is locked or pinned, + * otherwise the page backing may change under the caller. + * + * Return: True if page-backed, false otherwise. + */ +bool i915_gem_object_has_struct_page(const struct drm_i915_gem_object *obj) +{ +#ifdef CONFIG_LOCKDEP + if (IS_DGFX(to_i915(obj->base.dev)) && + i915_gem_object_evictable((void __force *)obj)) + assert_object_held_shared(obj); +#endif + return obj->mem_flags & I915_BO_FLAG_STRUCT_PAGE; +} + +/** + * i915_gem_object_has_iomem - Whether the object is iomem-backed + * @obj: The object to query. + * + * This function should only be called while the object is locked or pinned, + * otherwise the iomem backing may change under the caller. + * + * Return: True if iomem-backed, false otherwise. + */ +bool i915_gem_object_has_iomem(const struct drm_i915_gem_object *obj) +{ +#ifdef CONFIG_LOCKDEP + if (IS_DGFX(to_i915(obj->base.dev)) && + i915_gem_object_evictable((void __force *)obj)) + assert_object_held_shared(obj); +#endif + return obj->mem_flags & I915_BO_FLAG_IOMEM; +} + void i915_gem_init__objects(struct drm_i915_private *i915) { INIT_WORK(&i915->mm.free_work, __i915_gem_free_work); diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h index 7bf4dd46d8d26..ea3224a480c49 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_object.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h @@ -148,7 +148,7 @@ i915_gem_object_put(struct drm_i915_gem_object *obj) /* * If more than one potential simultaneous locker, assert held. */ -static inline void assert_object_held_shared(struct drm_i915_gem_object *obj) +static inline void assert_object_held_shared(const struct drm_i915_gem_object *obj) { /* * Note mm list lookup is protected by @@ -266,17 +266,9 @@ i915_gem_object_type_has(const struct drm_i915_gem_object *obj, return obj->ops->flags & flags; } -static inline bool -i915_gem_object_has_struct_page(const struct drm_i915_gem_object *obj) -{ - return obj->flags & I915_BO_ALLOC_STRUCT_PAGE; -} +bool i915_gem_object_has_struct_page(const struct drm_i915_gem_object *obj); -static inline bool -i915_gem_object_has_iomem(const struct drm_i915_gem_object *obj) -{ - return i915_gem_object_type_has(obj, I915_GEM_OBJECT_HAS_IOMEM); -} +bool i915_gem_object_has_iomem(const struct drm_i915_gem_object *obj); static inline bool i915_gem_object_is_shrinkable(const struct drm_i915_gem_object *obj) 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 3a2d9ecf8e03a..441f913c87e62 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h @@ -33,10 +33,9 @@ struct i915_lut_handle { struct drm_i915_gem_object_ops { unsigned int flags; -#define I915_GEM_OBJECT_HAS_IOMEM BIT(1) -#define I915_GEM_OBJECT_IS_SHRINKABLE BIT(2) -#define I915_GEM_OBJECT_IS_PROXY BIT(3) -#define I915_GEM_OBJECT_NO_MMAP BIT(4) +#define I915_GEM_OBJECT_IS_SHRINKABLE BIT(1) +#define I915_GEM_OBJECT_IS_PROXY BIT(2) +#define I915_GEM_OBJECT_NO_MMAP BIT(3) /* Interface between the GEM object and its backing storage. * get_pages() is called once prior to the use of the associated set @@ -201,17 +200,25 @@ struct drm_i915_gem_object { unsigned long flags; #define I915_BO_ALLOC_CONTIGUOUS BIT(0) #define I915_BO_ALLOC_VOLATILE BIT(1) -#define I915_BO_ALLOC_STRUCT_PAGE BIT(2) -#define I915_BO_ALLOC_CPU_CLEAR BIT(3) -#define I915_BO_ALLOC_USER BIT(4) +#define I915_BO_ALLOC_CPU_CLEAR BIT(2) +#define I915_BO_ALLOC_USER BIT(3) #define I915_BO_ALLOC_FLAGS (I915_BO_ALLOC_CONTIGUOUS | \ I915_BO_ALLOC_VOLATILE | \ - I915_BO_ALLOC_STRUCT_PAGE | \ I915_BO_ALLOC_CPU_CLEAR | \ I915_BO_ALLOC_USER) -#define I915_BO_READONLY BIT(5) -#define I915_TILING_QUIRK_BIT 6 /* unknown swizzling; do not release! */ +#define I915_BO_READONLY BIT(4) +#define I915_TILING_QUIRK_BIT 5 /* unknown swizzling; do not release! */ + /** + * @mem_flags - Mutable placement-related flags + * + * These are flags that indicate specifics of the memory region + * the object is currently in. As such they are only stable + * either under the object lock or if the object is pinned. + */ + unsigned int mem_flags; +#define I915_BO_FLAG_STRUCT_PAGE BIT(0) /* Object backed by struct pages */ +#define I915_BO_FLAG_IOMEM BIT(1) /* Object backed by IO memory */ /* * 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_pages.c b/drivers/gpu/drm/i915/gem/i915_gem_pages.c index 086005c1c7eae..f2f850e31b8ed 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_pages.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_pages.c @@ -351,7 +351,7 @@ void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj, int err; if (!i915_gem_object_has_struct_page(obj) && - !i915_gem_object_type_has(obj, I915_GEM_OBJECT_HAS_IOMEM)) + !i915_gem_object_has_iomem(obj)) return ERR_PTR(-ENXIO); assert_object_held(obj); diff --git a/drivers/gpu/drm/i915/gem/i915_gem_phys.c b/drivers/gpu/drm/i915/gem/i915_gem_phys.c index be72ad0634bae..7986612f48fad 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_phys.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_phys.c @@ -76,7 +76,7 @@ static int i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj) intel_gt_chipset_flush(&to_i915(obj->base.dev)->gt); /* We're no longer struct page backed */ - obj->flags &= ~I915_BO_ALLOC_STRUCT_PAGE; + obj->mem_flags &= ~I915_BO_FLAG_STRUCT_PAGE; __i915_gem_object_set_pages(obj, st, sg->length); return 0; diff --git a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c index 5d16c4462fda0..7aa1c95c7b7dd 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c @@ -444,7 +444,7 @@ shmem_pread(struct drm_i915_gem_object *obj, static void shmem_release(struct drm_i915_gem_object *obj) { - if (obj->flags & I915_BO_ALLOC_STRUCT_PAGE) + if (i915_gem_object_has_struct_page(obj)) i915_gem_object_release_memory_region(obj); fput(obj->base.filp); @@ -513,9 +513,8 @@ static int shmem_object_init(struct intel_memory_region *mem, mapping_set_gfp_mask(mapping, mask); GEM_BUG_ON(!(mapping_gfp_mask(mapping) & __GFP_RECLAIM)); - i915_gem_object_init(obj, &i915_gem_shmem_ops, &lock_class, - I915_BO_ALLOC_STRUCT_PAGE); - + i915_gem_object_init(obj, &i915_gem_shmem_ops, &lock_class, 0); + obj->mem_flags |= I915_BO_FLAG_STRUCT_PAGE; obj->write_domain = I915_GEM_DOMAIN_CPU; obj->read_domains = I915_GEM_DOMAIN_CPU; diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c index cf5540c1537bf..e41bb9d6a4919 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c @@ -732,7 +732,6 @@ static u64 i915_ttm_mmap_offset(struct drm_i915_gem_object *obj) static const struct drm_i915_gem_object_ops i915_gem_ttm_obj_ops = { .name = "i915_gem_object_ttm", - .flags = I915_GEM_OBJECT_HAS_IOMEM, .get_pages = i915_ttm_get_pages, .put_pages = i915_ttm_put_pages, @@ -777,6 +776,7 @@ int __i915_gem_ttm_object_init(struct intel_memory_region *mem, i915_gem_object_init_memory_region(obj, mem); i915_gem_object_make_unshrinkable(obj); obj->read_domains = I915_GEM_DOMAIN_WC | I915_GEM_DOMAIN_GTT; + obj->mem_flags |= I915_BO_FLAG_IOMEM; i915_gem_object_set_cache_coherency(obj, I915_CACHE_NONE); INIT_RADIX_TREE(&obj->ttm.get_io_page.radix, GFP_KERNEL | __GFP_NOWARN); mutex_init(&obj->ttm.get_io_page.lock); diff --git a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c index 4b0acc7eaa271..56edfeff8c02e 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c @@ -510,8 +510,8 @@ i915_gem_userptr_ioctl(struct drm_device *dev, return -ENOMEM; drm_gem_private_object_init(dev, &obj->base, args->user_size); - i915_gem_object_init(obj, &i915_gem_userptr_ops, &lock_class, - I915_BO_ALLOC_STRUCT_PAGE); + i915_gem_object_init(obj, &i915_gem_userptr_ops, &lock_class, 0); + obj->mem_flags = I915_BO_FLAG_STRUCT_PAGE; obj->read_domains = I915_GEM_DOMAIN_CPU; obj->write_domain = I915_GEM_DOMAIN_CPU; i915_gem_object_set_cache_coherency(obj, I915_CACHE_LLC); diff --git a/drivers/gpu/drm/i915/gem/selftests/huge_gem_object.c b/drivers/gpu/drm/i915/gem/selftests/huge_gem_object.c index 0c8ecfdf54056..f963b8e1e37b5 100644 --- a/drivers/gpu/drm/i915/gem/selftests/huge_gem_object.c +++ b/drivers/gpu/drm/i915/gem/selftests/huge_gem_object.c @@ -114,8 +114,8 @@ huge_gem_object(struct drm_i915_private *i915, return ERR_PTR(-ENOMEM); drm_gem_private_object_init(&i915->drm, &obj->base, dma_size); - i915_gem_object_init(obj, &huge_ops, &lock_class, - I915_BO_ALLOC_STRUCT_PAGE); + i915_gem_object_init(obj, &huge_ops, &lock_class, 0); + obj->mem_flags |= I915_BO_FLAG_STRUCT_PAGE; obj->read_domains = I915_GEM_DOMAIN_CPU; obj->write_domain = I915_GEM_DOMAIN_CPU; diff --git a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c index dadd485bc52fa..ccc67ed1a84b1 100644 --- a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c +++ b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c @@ -167,9 +167,8 @@ huge_pages_object(struct drm_i915_private *i915, return ERR_PTR(-ENOMEM); drm_gem_private_object_init(&i915->drm, &obj->base, size); - i915_gem_object_init(obj, &huge_page_ops, &lock_class, - I915_BO_ALLOC_STRUCT_PAGE); - + i915_gem_object_init(obj, &huge_page_ops, &lock_class, 0); + obj->mem_flags |= I915_BO_FLAG_STRUCT_PAGE; i915_gem_object_set_volatile(obj); obj->write_domain = I915_GEM_DOMAIN_CPU; diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c index 44b5de06ce649..607b7d2d4c29c 100644 --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c @@ -831,16 +831,19 @@ static int wc_check(struct drm_i915_gem_object *obj) static bool can_mmap(struct drm_i915_gem_object *obj, enum i915_mmap_type type) { + bool no_map; + if (type == I915_MMAP_TYPE_GTT && !i915_ggtt_has_aperture(&to_i915(obj->base.dev)->ggtt)) return false; - if (type != I915_MMAP_TYPE_GTT && - !i915_gem_object_has_struct_page(obj) && - !i915_gem_object_type_has(obj, I915_GEM_OBJECT_HAS_IOMEM)) - return false; + i915_gem_object_lock(obj, NULL); + no_map = (type != I915_MMAP_TYPE_GTT && + !i915_gem_object_has_struct_page(obj) && + !i915_gem_object_has_iomem(obj)); + i915_gem_object_unlock(obj); - return true; + return !no_map; } static void object_set_placements(struct drm_i915_gem_object *obj, @@ -988,10 +991,16 @@ static const char *repr_mmap_type(enum i915_mmap_type type) } } -static bool can_access(const struct drm_i915_gem_object *obj) +static bool can_access(struct drm_i915_gem_object *obj) { - return i915_gem_object_has_struct_page(obj) || - i915_gem_object_type_has(obj, I915_GEM_OBJECT_HAS_IOMEM); + bool access; + + i915_gem_object_lock(obj, NULL); + access = i915_gem_object_has_struct_page(obj) || + i915_gem_object_has_iomem(obj); + i915_gem_object_unlock(obj); + + return access; } static int __igt_mmap_access(struct drm_i915_private *i915, diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_phys.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_phys.c index 3a6ce87f8b524..d43d8dae0f699 100644 --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_phys.c +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_phys.c @@ -25,13 +25,14 @@ static int mock_phys_object(void *arg) goto out; } + i915_gem_object_lock(obj, NULL); if (!i915_gem_object_has_struct_page(obj)) { + i915_gem_object_unlock(obj); err = -EINVAL; pr_err("shmem has no struct page\n"); goto out_obj; } - i915_gem_object_lock(obj, NULL); err = i915_gem_object_attach_phys(obj, PAGE_SIZE); i915_gem_object_unlock(obj); if (err) { diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c index cb182c6d265a4..a2c58b54a5928 100644 --- a/drivers/gpu/drm/i915/i915_gpu_error.c +++ b/drivers/gpu/drm/i915/i915_gpu_error.c @@ -1039,7 +1039,7 @@ i915_vma_coredump_create(const struct intel_gt *gt, if (ret) break; } - } else if (i915_gem_object_is_lmem(vma->obj)) { + } else if (__i915_gem_object_is_lmem(vma->obj)) { struct intel_memory_region *mem = vma->obj->mm.region; dma_addr_t dma; -- 2.39.5