/* * SPDX-License-Identifier: MIT * * Copyright © 2008-2012 Intel Corporation */ #include #include #include #include #include "gem/i915_gem_lmem.h" #include "gem/i915_gem_region.h" #include "i915_drv.h" #include "i915_gem_stolen.h" #include "i915_vgpu.h" /* * The BIOS typically reserves some of the system's memory for the exclusive * use of the integrated graphics. This memory is no longer available for * use by the OS and so the user finds that his system has less memory * available than he put in. We refer to this memory as stolen. * * The BIOS will allocate its framebuffer from the stolen memory. Our * goal is try to reuse that object for our own fbcon which must always * be available for panics. Anything else we can reuse the stolen memory * for is a boon. */ int i915_gem_stolen_insert_node_in_range(struct drm_i915_private *i915, struct drm_mm_node *node, u64 size, unsigned alignment, u64 start, u64 end) { int ret; if (!drm_mm_initialized(&i915->mm.stolen)) return -ENODEV; /* WaSkipStolenMemoryFirstPage:bdw+ */ if (GRAPHICS_VER(i915) >= 8 && start < 4096) start = 4096; mutex_lock(&i915->mm.stolen_lock); ret = drm_mm_insert_node_in_range(&i915->mm.stolen, node, size, alignment, 0, start, end, DRM_MM_INSERT_BEST); mutex_unlock(&i915->mm.stolen_lock); return ret; } int i915_gem_stolen_insert_node(struct drm_i915_private *i915, struct drm_mm_node *node, u64 size, unsigned alignment) { return i915_gem_stolen_insert_node_in_range(i915, node, size, alignment, I915_GEM_STOLEN_BIAS, U64_MAX); } void i915_gem_stolen_remove_node(struct drm_i915_private *i915, struct drm_mm_node *node) { mutex_lock(&i915->mm.stolen_lock); drm_mm_remove_node(node); mutex_unlock(&i915->mm.stolen_lock); } static int i915_adjust_stolen(struct drm_i915_private *i915, struct resource *dsm) { struct i915_ggtt *ggtt = &i915->ggtt; struct intel_uncore *uncore = ggtt->vm.gt->uncore; struct resource *r; if (dsm->start == 0 || dsm->end <= dsm->start) return -EINVAL; /* * TODO: We have yet too encounter the case where the GTT wasn't at the * end of stolen. With that assumption we could simplify this. */ /* Make sure we don't clobber the GTT if it's within stolen memory */ if (GRAPHICS_VER(i915) <= 4 && !IS_G33(i915) && !IS_PINEVIEW(i915) && !IS_G4X(i915)) { struct resource stolen[2] = {*dsm, *dsm}; struct resource ggtt_res; resource_size_t ggtt_start; ggtt_start = intel_uncore_read(uncore, PGTBL_CTL); if (GRAPHICS_VER(i915) == 4) ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) | (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28; else ggtt_start &= PGTBL_ADDRESS_LO_MASK; ggtt_res = (struct resource) DEFINE_RES_MEM(ggtt_start, ggtt_total_entries(ggtt) * 4); if (ggtt_res.start >= stolen[0].start && ggtt_res.start < stolen[0].end) stolen[0].end = ggtt_res.start; if (ggtt_res.end > stolen[1].start && ggtt_res.end <= stolen[1].end) stolen[1].start = ggtt_res.end; /* Pick the larger of the two chunks */ if (resource_size(&stolen[0]) > resource_size(&stolen[1])) *dsm = stolen[0]; else *dsm = stolen[1]; if (stolen[0].start != stolen[1].start || stolen[0].end != stolen[1].end) { drm_dbg(&i915->drm, "GTT within stolen memory at %pR\n", &ggtt_res); drm_dbg(&i915->drm, "Stolen memory adjusted to %pR\n", dsm); } } /* * With stolen lmem, we don't need to check if the address range * overlaps with the non-stolen system memory range, since lmem is local * to the gpu. */ if (HAS_LMEM(i915)) return 0; /* * Verify that nothing else uses this physical address. Stolen * memory should be reserved by the BIOS and hidden from the * kernel. So if the region is already marked as busy, something * is seriously wrong. */ r = devm_request_mem_region(i915->drm.dev, dsm->start, resource_size(dsm), "Graphics Stolen Memory"); if (r == NULL) { /* * One more attempt but this time requesting region from * start + 1, as we have seen that this resolves the region * conflict with the PCI Bus. * This is a BIOS w/a: Some BIOS wrap stolen in the root * PCI bus, but have an off-by-one error. Hence retry the * reservation starting from 1 instead of 0. * There's also BIOS with off-by-one on the other end. */ r = devm_request_mem_region(i915->drm.dev, dsm->start + 1, resource_size(dsm) - 2, "Graphics Stolen Memory"); /* * GEN3 firmware likes to smash pci bridges into the stolen * range. Apparently this works. */ if (!r && GRAPHICS_VER(i915) != 3) { drm_err(&i915->drm, "conflict detected with stolen region: %pR\n", dsm); return -EBUSY; } } return 0; } static void i915_gem_cleanup_stolen(struct drm_i915_private *i915) { if (!drm_mm_initialized(&i915->mm.stolen)) return; drm_mm_takedown(&i915->mm.stolen); } static void g4x_get_stolen_reserved(struct drm_i915_private *i915, struct intel_uncore *uncore, resource_size_t *base, resource_size_t *size) { u32 reg_val = intel_uncore_read(uncore, IS_GM45(i915) ? CTG_STOLEN_RESERVED : ELK_STOLEN_RESERVED); resource_size_t stolen_top = i915->dsm.end + 1; drm_dbg(&i915->drm, "%s_STOLEN_RESERVED = %08x\n", IS_GM45(i915) ? "CTG" : "ELK", reg_val); if ((reg_val & G4X_STOLEN_RESERVED_ENABLE) == 0) return; /* * Whether ILK really reuses the ELK register for this is unclear. * Let's see if we catch anyone with this supposedly enabled on ILK. */ drm_WARN(&i915->drm, GRAPHICS_VER(i915) == 5, "ILK stolen reserved found? 0x%08x\n", reg_val); if (!(reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK)) return; *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16; drm_WARN_ON(&i915->drm, (reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base); *size = stolen_top - *base; } static void gen6_get_stolen_reserved(struct drm_i915_private *i915, struct intel_uncore *uncore, resource_size_t *base, resource_size_t *size) { u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED); drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val); if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE)) return; *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) { case GEN6_STOLEN_RESERVED_1M: *size = 1024 * 1024; break; case GEN6_STOLEN_RESERVED_512K: *size = 512 * 1024; break; case GEN6_STOLEN_RESERVED_256K: *size = 256 * 1024; break; case GEN6_STOLEN_RESERVED_128K: *size = 128 * 1024; break; default: *size = 1024 * 1024; MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK); } } static void vlv_get_stolen_reserved(struct drm_i915_private *i915, struct intel_uncore *uncore, resource_size_t *base, resource_size_t *size) { u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED); resource_size_t stolen_top = i915->dsm.end + 1; drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val); if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE)) return; switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) { default: MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK); fallthrough; case GEN7_STOLEN_RESERVED_1M: *size = 1024 * 1024; break; } /* * On vlv, the ADDR_MASK portion is left as 0 and HW deduces the * reserved location as (top - size). */ *base = stolen_top - *size; } static void gen7_get_stolen_reserved(struct drm_i915_private *i915, struct intel_uncore *uncore, resource_size_t *base, resource_size_t *size) { u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED); drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val); if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE)) return; *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK; switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) { case GEN7_STOLEN_RESERVED_1M: *size = 1024 * 1024; break; case GEN7_STOLEN_RESERVED_256K: *size = 256 * 1024; break; default: *size = 1024 * 1024; MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK); } } static void chv_get_stolen_reserved(struct drm_i915_private *i915, struct intel_uncore *uncore, resource_size_t *base, resource_size_t *size) { u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED); drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val); if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE)) return; *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) { case GEN8_STOLEN_RESERVED_1M: *size = 1024 * 1024; break; case GEN8_STOLEN_RESERVED_2M: *size = 2 * 1024 * 1024; break; case GEN8_STOLEN_RESERVED_4M: *size = 4 * 1024 * 1024; break; case GEN8_STOLEN_RESERVED_8M: *size = 8 * 1024 * 1024; break; default: *size = 8 * 1024 * 1024; MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK); } } static void bdw_get_stolen_reserved(struct drm_i915_private *i915, struct intel_uncore *uncore, resource_size_t *base, resource_size_t *size) { u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED); resource_size_t stolen_top = i915->dsm.end + 1; drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val); if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE)) return; if (!(reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK)) return; *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; *size = stolen_top - *base; } static void icl_get_stolen_reserved(struct drm_i915_private *i915, struct intel_uncore *uncore, resource_size_t *base, resource_size_t *size) { u64 reg_val = intel_uncore_read64(uncore, GEN6_STOLEN_RESERVED); drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = 0x%016llx\n", reg_val); *base = reg_val & GEN11_STOLEN_RESERVED_ADDR_MASK; switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) { case GEN8_STOLEN_RESERVED_1M: *size = 1024 * 1024; break; case GEN8_STOLEN_RESERVED_2M: *size = 2 * 1024 * 1024; break; case GEN8_STOLEN_RESERVED_4M: *size = 4 * 1024 * 1024; break; case GEN8_STOLEN_RESERVED_8M: *size = 8 * 1024 * 1024; break; default: *size = 8 * 1024 * 1024; MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK); } } static int i915_gem_init_stolen(struct intel_memory_region *mem) { struct drm_i915_private *i915 = mem->i915; struct intel_uncore *uncore = &i915->uncore; resource_size_t reserved_base, stolen_top; resource_size_t reserved_total, reserved_size; mutex_init(&i915->mm.stolen_lock); if (intel_vgpu_active(i915)) { drm_notice(&i915->drm, "%s, disabling use of stolen memory\n", "iGVT-g active"); return 0; } if (intel_vtd_active() && GRAPHICS_VER(i915) < 8) { drm_notice(&i915->drm, "%s, disabling use of stolen memory\n", "DMAR active"); return 0; } if (resource_size(&mem->region) == 0) return 0; i915->dsm = mem->region; if (i915_adjust_stolen(i915, &i915->dsm)) return 0; GEM_BUG_ON(i915->dsm.start == 0); GEM_BUG_ON(i915->dsm.end <= i915->dsm.start); stolen_top = i915->dsm.end + 1; reserved_base = stolen_top; reserved_size = 0; switch (GRAPHICS_VER(i915)) { case 2: case 3: break; case 4: if (!IS_G4X(i915)) break; fallthrough; case 5: g4x_get_stolen_reserved(i915, uncore, &reserved_base, &reserved_size); break; case 6: gen6_get_stolen_reserved(i915, uncore, &reserved_base, &reserved_size); break; case 7: if (IS_VALLEYVIEW(i915)) vlv_get_stolen_reserved(i915, uncore, &reserved_base, &reserved_size); else gen7_get_stolen_reserved(i915, uncore, &reserved_base, &reserved_size); break; case 8: case 9: if (IS_LP(i915)) chv_get_stolen_reserved(i915, uncore, &reserved_base, &reserved_size); else bdw_get_stolen_reserved(i915, uncore, &reserved_base, &reserved_size); break; default: MISSING_CASE(GRAPHICS_VER(i915)); fallthrough; case 11: case 12: icl_get_stolen_reserved(i915, uncore, &reserved_base, &reserved_size); break; } /* * Our expectation is that the reserved space is at the top of the * stolen region and *never* at the bottom. If we see !reserved_base, * it likely means we failed to read the registers correctly. */ if (!reserved_base) { drm_err(&i915->drm, "inconsistent reservation %pa + %pa; ignoring\n", &reserved_base, &reserved_size); reserved_base = stolen_top; reserved_size = 0; } i915->dsm_reserved = (struct resource)DEFINE_RES_MEM(reserved_base, reserved_size); if (!resource_contains(&i915->dsm, &i915->dsm_reserved)) { drm_err(&i915->drm, "Stolen reserved area %pR outside stolen memory %pR\n", &i915->dsm_reserved, &i915->dsm); return 0; } /* It is possible for the reserved area to end before the end of stolen * memory, so just consider the start. */ reserved_total = stolen_top - reserved_base; drm_dbg(&i915->drm, "Memory reserved for graphics device: %lluK, usable: %lluK\n", (u64)resource_size(&i915->dsm) >> 10, ((u64)resource_size(&i915->dsm) - reserved_total) >> 10); i915->stolen_usable_size = resource_size(&i915->dsm) - reserved_total; /* Basic memrange allocator for stolen space. */ drm_mm_init(&i915->mm.stolen, 0, i915->stolen_usable_size); return 0; } static void dbg_poison(struct i915_ggtt *ggtt, dma_addr_t addr, resource_size_t size, u8 x) { #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM) if (!drm_mm_node_allocated(&ggtt->error_capture)) return; if (ggtt->vm.bind_async_flags & I915_VMA_GLOBAL_BIND) return; /* beware stop_machine() inversion */ GEM_BUG_ON(!IS_ALIGNED(size, PAGE_SIZE)); mutex_lock(&ggtt->error_mutex); while (size) { void __iomem *s; ggtt->vm.insert_page(&ggtt->vm, addr, ggtt->error_capture.start, I915_CACHE_NONE, 0); mb(); s = io_mapping_map_wc(&ggtt->iomap, ggtt->error_capture.start, PAGE_SIZE); memset_io(s, x, PAGE_SIZE); io_mapping_unmap(s); addr += PAGE_SIZE; size -= PAGE_SIZE; } mb(); ggtt->vm.clear_range(&ggtt->vm, ggtt->error_capture.start, PAGE_SIZE); mutex_unlock(&ggtt->error_mutex); #endif } static struct sg_table * i915_pages_create_for_stolen(struct drm_device *dev, resource_size_t offset, resource_size_t size) { struct drm_i915_private *i915 = to_i915(dev); struct sg_table *st; struct scatterlist *sg; GEM_BUG_ON(range_overflows(offset, size, resource_size(&i915->dsm))); /* We hide that we have no struct page backing our stolen object * by wrapping the contiguous physical allocation with a fake * dma mapping in a single scatterlist. */ st = kmalloc(sizeof(*st), GFP_KERNEL); if (st == NULL) return ERR_PTR(-ENOMEM); if (sg_alloc_table(st, 1, GFP_KERNEL)) { kfree(st); return ERR_PTR(-ENOMEM); } sg = st->sgl; sg->offset = 0; sg->length = size; sg_dma_address(sg) = (dma_addr_t)i915->dsm.start + offset; sg_dma_len(sg) = size; return st; } static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj) { struct sg_table *pages = i915_pages_create_for_stolen(obj->base.dev, obj->stolen->start, obj->stolen->size); if (IS_ERR(pages)) return PTR_ERR(pages); dbg_poison(&to_i915(obj->base.dev)->ggtt, sg_dma_address(pages->sgl), sg_dma_len(pages->sgl), POISON_INUSE); __i915_gem_object_set_pages(obj, pages, obj->stolen->size); return 0; } static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj, struct sg_table *pages) { /* Should only be called from i915_gem_object_release_stolen() */ dbg_poison(&to_i915(obj->base.dev)->ggtt, sg_dma_address(pages->sgl), sg_dma_len(pages->sgl), POISON_FREE); sg_free_table(pages); kfree(pages); } static void i915_gem_object_release_stolen(struct drm_i915_gem_object *obj) { struct drm_i915_private *i915 = to_i915(obj->base.dev); struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen); GEM_BUG_ON(!stolen); i915_gem_stolen_remove_node(i915, stolen); kfree(stolen); i915_gem_object_release_memory_region(obj); } static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = { .name = "i915_gem_object_stolen", .get_pages = i915_gem_object_get_pages_stolen, .put_pages = i915_gem_object_put_pages_stolen, .release = i915_gem_object_release_stolen, }; static int __i915_gem_object_create_stolen(struct intel_memory_region *mem, struct drm_i915_gem_object *obj, struct drm_mm_node *stolen) { static struct lock_class_key lock_class; unsigned int cache_level; unsigned int flags; int err; /* * Stolen objects are always physically contiguous since we just * allocate one big block underneath using the drm_mm range allocator. */ flags = I915_BO_ALLOC_CONTIGUOUS; drm_gem_private_object_init(&mem->i915->drm, &obj->base, stolen->size); i915_gem_object_init(obj, &i915_gem_object_stolen_ops, &lock_class, flags); obj->stolen = stolen; obj->read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT; cache_level = HAS_LLC(mem->i915) ? I915_CACHE_LLC : I915_CACHE_NONE; i915_gem_object_set_cache_coherency(obj, cache_level); if (WARN_ON(!i915_gem_object_trylock(obj))) return -EBUSY; i915_gem_object_init_memory_region(obj, mem); err = i915_gem_object_pin_pages(obj); if (err) i915_gem_object_release_memory_region(obj); i915_gem_object_unlock(obj); return err; } static int _i915_gem_object_stolen_init(struct intel_memory_region *mem, struct drm_i915_gem_object *obj, resource_size_t size, resource_size_t page_size, unsigned int flags) { struct drm_i915_private *i915 = mem->i915; struct drm_mm_node *stolen; int ret; if (!drm_mm_initialized(&i915->mm.stolen)) return -ENODEV; if (size == 0) return -EINVAL; stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); if (!stolen) return -ENOMEM; ret = i915_gem_stolen_insert_node(i915, stolen, size, mem->min_page_size); if (ret) goto err_free; ret = __i915_gem_object_create_stolen(mem, obj, stolen); if (ret) goto err_remove; return 0; err_remove: i915_gem_stolen_remove_node(i915, stolen); err_free: kfree(stolen); return ret; } struct drm_i915_gem_object * i915_gem_object_create_stolen(struct drm_i915_private *i915, resource_size_t size) { return i915_gem_object_create_region(i915->mm.stolen_region, size, 0, 0); } static int init_stolen_smem(struct intel_memory_region *mem) { /* * Initialise stolen early so that we may reserve preallocated * objects for the BIOS to KMS transition. */ return i915_gem_init_stolen(mem); } static void release_stolen_smem(struct intel_memory_region *mem) { i915_gem_cleanup_stolen(mem->i915); } static const struct intel_memory_region_ops i915_region_stolen_smem_ops = { .init = init_stolen_smem, .release = release_stolen_smem, .init_object = _i915_gem_object_stolen_init, }; static int init_stolen_lmem(struct intel_memory_region *mem) { int err; if (GEM_WARN_ON(resource_size(&mem->region) == 0)) return -ENODEV; if (!io_mapping_init_wc(&mem->iomap, mem->io_start, resource_size(&mem->region))) return -EIO; /* * TODO: For stolen lmem we mostly just care about populating the dsm * related bits and setting up the drm_mm allocator for the range. * Perhaps split up i915_gem_init_stolen() for this. */ err = i915_gem_init_stolen(mem); if (err) goto err_fini; return 0; err_fini: io_mapping_fini(&mem->iomap); return err; } static void release_stolen_lmem(struct intel_memory_region *mem) { io_mapping_fini(&mem->iomap); i915_gem_cleanup_stolen(mem->i915); } static const struct intel_memory_region_ops i915_region_stolen_lmem_ops = { .init = init_stolen_lmem, .release = release_stolen_lmem, .init_object = _i915_gem_object_stolen_init, }; struct intel_memory_region * i915_gem_stolen_lmem_setup(struct drm_i915_private *i915, u16 type, u16 instance) { struct intel_uncore *uncore = &i915->uncore; struct pci_dev *pdev = to_pci_dev(i915->drm.dev); struct intel_memory_region *mem; resource_size_t io_start; resource_size_t lmem_size; u64 lmem_base; lmem_base = intel_uncore_read64(uncore, GEN12_DSMBASE); if (GEM_WARN_ON(lmem_base >= pci_resource_len(pdev, 2))) return ERR_PTR(-ENODEV); lmem_size = pci_resource_len(pdev, 2) - lmem_base; io_start = pci_resource_start(pdev, 2) + lmem_base; mem = intel_memory_region_create(i915, lmem_base, lmem_size, I915_GTT_PAGE_SIZE_4K, io_start, type, instance, &i915_region_stolen_lmem_ops); if (IS_ERR(mem)) return mem; /* * TODO: consider creating common helper to just print all the * interesting stuff from intel_memory_region, which we can use for all * our probed regions. */ drm_dbg(&i915->drm, "Stolen Local memory IO start: %pa\n", &mem->io_start); intel_memory_region_set_name(mem, "stolen-local"); mem->private = true; return mem; } struct intel_memory_region* i915_gem_stolen_smem_setup(struct drm_i915_private *i915, u16 type, u16 instance) { struct intel_memory_region *mem; mem = intel_memory_region_create(i915, intel_graphics_stolen_res.start, resource_size(&intel_graphics_stolen_res), PAGE_SIZE, 0, type, instance, &i915_region_stolen_smem_ops); if (IS_ERR(mem)) return mem; intel_memory_region_set_name(mem, "stolen-system"); mem->private = true; return mem; } struct drm_i915_gem_object * i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *i915, resource_size_t stolen_offset, resource_size_t size) { struct intel_memory_region *mem = i915->mm.stolen_region; struct drm_i915_gem_object *obj; struct drm_mm_node *stolen; int ret; if (!drm_mm_initialized(&i915->mm.stolen)) return ERR_PTR(-ENODEV); drm_dbg(&i915->drm, "creating preallocated stolen object: stolen_offset=%pa, size=%pa\n", &stolen_offset, &size); /* KISS and expect everything to be page-aligned */ if (GEM_WARN_ON(size == 0) || GEM_WARN_ON(!IS_ALIGNED(size, mem->min_page_size)) || GEM_WARN_ON(!IS_ALIGNED(stolen_offset, mem->min_page_size))) return ERR_PTR(-EINVAL); stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); if (!stolen) return ERR_PTR(-ENOMEM); stolen->start = stolen_offset; stolen->size = size; mutex_lock(&i915->mm.stolen_lock); ret = drm_mm_reserve_node(&i915->mm.stolen, stolen); mutex_unlock(&i915->mm.stolen_lock); if (ret) goto err_free; obj = i915_gem_object_alloc(); if (!obj) { ret = -ENOMEM; goto err_stolen; } ret = __i915_gem_object_create_stolen(mem, obj, stolen); if (ret) goto err_object_free; i915_gem_object_set_cache_coherency(obj, I915_CACHE_NONE); return obj; err_object_free: i915_gem_object_free(obj); err_stolen: i915_gem_stolen_remove_node(i915, stolen); err_free: kfree(stolen); return ERR_PTR(ret); } bool i915_gem_object_is_stolen(const struct drm_i915_gem_object *obj) { return obj->ops == &i915_gem_object_stolen_ops; }