/* * SPDX-License-Identifier: MIT * * Copyright © 2008-2012 Intel Corporation */ #include #include #include #include #include "gem/i915_gem_region.h" #include "i915_drv.h" #include "i915_gem_stolen.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 *dev_priv, struct drm_mm_node *node, u64 size, unsigned alignment, u64 start, u64 end) { int ret; if (!drm_mm_initialized(&dev_priv->mm.stolen)) return -ENODEV; /* WaSkipStolenMemoryFirstPage:bdw+ */ if (INTEL_GEN(dev_priv) >= 8 && start < 4096) start = 4096; mutex_lock(&dev_priv->mm.stolen_lock); ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node, size, alignment, 0, start, end, DRM_MM_INSERT_BEST); mutex_unlock(&dev_priv->mm.stolen_lock); return ret; } int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv, struct drm_mm_node *node, u64 size, unsigned alignment) { return i915_gem_stolen_insert_node_in_range(dev_priv, node, size, alignment, 0, U64_MAX); } void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv, struct drm_mm_node *node) { mutex_lock(&dev_priv->mm.stolen_lock); drm_mm_remove_node(node); mutex_unlock(&dev_priv->mm.stolen_lock); } static int i915_adjust_stolen(struct drm_i915_private *dev_priv, struct resource *dsm) { struct i915_ggtt *ggtt = &dev_priv->ggtt; 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 (INTEL_GEN(dev_priv) <= 4 && !IS_G33(dev_priv) && !IS_PINEVIEW(dev_priv) && !IS_G4X(dev_priv)) { struct resource stolen[2] = {*dsm, *dsm}; struct resource ggtt_res; resource_size_t ggtt_start; ggtt_start = I915_READ(PGTBL_CTL); if (IS_GEN(dev_priv, 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_DEBUG_DRIVER("GTT within stolen memory at %pR\n", &ggtt_res); DRM_DEBUG_DRIVER("Stolen memory adjusted to %pR\n", dsm); } } /* * 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(dev_priv->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(dev_priv->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 == NULL && !IS_GEN(dev_priv, 3)) { DRM_ERROR("conflict detected with stolen region: %pR\n", dsm); return -EBUSY; } } return 0; } static void i915_gem_cleanup_stolen(struct drm_i915_private *dev_priv) { if (!drm_mm_initialized(&dev_priv->mm.stolen)) return; drm_mm_takedown(&dev_priv->mm.stolen); } static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv, resource_size_t *base, resource_size_t *size) { u32 reg_val = I915_READ(IS_GM45(dev_priv) ? CTG_STOLEN_RESERVED : ELK_STOLEN_RESERVED); resource_size_t stolen_top = dev_priv->dsm.end + 1; DRM_DEBUG_DRIVER("%s_STOLEN_RESERVED = %08x\n", IS_GM45(dev_priv) ? "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. */ WARN(IS_GEN(dev_priv, 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; WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base); *size = stolen_top - *base; } static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv, resource_size_t *base, resource_size_t *size) { u32 reg_val = I915_READ(GEN6_STOLEN_RESERVED); DRM_DEBUG_DRIVER("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 *dev_priv, resource_size_t *base, resource_size_t *size) { u32 reg_val = I915_READ(GEN6_STOLEN_RESERVED); resource_size_t stolen_top = dev_priv->dsm.end + 1; DRM_DEBUG_DRIVER("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); /* fall through */ 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 *dev_priv, resource_size_t *base, resource_size_t *size) { u32 reg_val = I915_READ(GEN6_STOLEN_RESERVED); DRM_DEBUG_DRIVER("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 *dev_priv, resource_size_t *base, resource_size_t *size) { u32 reg_val = I915_READ(GEN6_STOLEN_RESERVED); DRM_DEBUG_DRIVER("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 *dev_priv, resource_size_t *base, resource_size_t *size) { u32 reg_val = I915_READ(GEN6_STOLEN_RESERVED); resource_size_t stolen_top = dev_priv->dsm.end + 1; DRM_DEBUG_DRIVER("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, resource_size_t *base, resource_size_t *size) { u64 reg_val = intel_uncore_read64(&i915->uncore, GEN6_STOLEN_RESERVED); DRM_DEBUG_DRIVER("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 drm_i915_private *dev_priv) { resource_size_t reserved_base, stolen_top; resource_size_t reserved_total, reserved_size; mutex_init(&dev_priv->mm.stolen_lock); if (intel_vgpu_active(dev_priv)) { dev_notice(dev_priv->drm.dev, "%s, disabling use of stolen memory\n", "iGVT-g active"); return 0; } if (intel_vtd_active() && INTEL_GEN(dev_priv) < 8) { dev_notice(dev_priv->drm.dev, "%s, disabling use of stolen memory\n", "DMAR active"); return 0; } if (resource_size(&intel_graphics_stolen_res) == 0) return 0; dev_priv->dsm = intel_graphics_stolen_res; if (i915_adjust_stolen(dev_priv, &dev_priv->dsm)) return 0; GEM_BUG_ON(dev_priv->dsm.start == 0); GEM_BUG_ON(dev_priv->dsm.end <= dev_priv->dsm.start); stolen_top = dev_priv->dsm.end + 1; reserved_base = stolen_top; reserved_size = 0; switch (INTEL_GEN(dev_priv)) { case 2: case 3: break; case 4: if (!IS_G4X(dev_priv)) break; /* fall through */ case 5: g4x_get_stolen_reserved(dev_priv, &reserved_base, &reserved_size); break; case 6: gen6_get_stolen_reserved(dev_priv, &reserved_base, &reserved_size); break; case 7: if (IS_VALLEYVIEW(dev_priv)) vlv_get_stolen_reserved(dev_priv, &reserved_base, &reserved_size); else gen7_get_stolen_reserved(dev_priv, &reserved_base, &reserved_size); break; case 8: case 9: case 10: if (IS_LP(dev_priv)) chv_get_stolen_reserved(dev_priv, &reserved_base, &reserved_size); else bdw_get_stolen_reserved(dev_priv, &reserved_base, &reserved_size); break; default: MISSING_CASE(INTEL_GEN(dev_priv)); /* fall-through */ case 11: case 12: icl_get_stolen_reserved(dev_priv, &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_ERROR("inconsistent reservation %pa + %pa; ignoring\n", &reserved_base, &reserved_size); reserved_base = stolen_top; reserved_size = 0; } dev_priv->dsm_reserved = (struct resource) DEFINE_RES_MEM(reserved_base, reserved_size); if (!resource_contains(&dev_priv->dsm, &dev_priv->dsm_reserved)) { DRM_ERROR("Stolen reserved area %pR outside stolen memory %pR\n", &dev_priv->dsm_reserved, &dev_priv->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_DEBUG_DRIVER("Memory reserved for graphics device: %lluK, usable: %lluK\n", (u64)resource_size(&dev_priv->dsm) >> 10, ((u64)resource_size(&dev_priv->dsm) - reserved_total) >> 10); dev_priv->stolen_usable_size = resource_size(&dev_priv->dsm) - reserved_total; /* Basic memrange allocator for stolen space. */ drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->stolen_usable_size); return 0; } 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 *dev_priv = to_i915(dev); struct sg_table *st; struct scatterlist *sg; GEM_BUG_ON(range_overflows(offset, size, resource_size(&dev_priv->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)dev_priv->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); __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() */ sg_free_table(pages); kfree(pages); } static void i915_gem_object_release_stolen(struct drm_i915_gem_object *obj) { struct drm_i915_private *dev_priv = to_i915(obj->base.dev); struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen); GEM_BUG_ON(!stolen); i915_gem_stolen_remove_node(dev_priv, stolen); kfree(stolen); if (obj->mm.region) i915_gem_object_release_memory_region(obj); } static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = { .get_pages = i915_gem_object_get_pages_stolen, .put_pages = i915_gem_object_put_pages_stolen, .release = i915_gem_object_release_stolen, }; static struct drm_i915_gem_object * __i915_gem_object_create_stolen(struct drm_i915_private *dev_priv, struct drm_mm_node *stolen, struct intel_memory_region *mem) { struct drm_i915_gem_object *obj; unsigned int cache_level; int err = -ENOMEM; obj = i915_gem_object_alloc(); if (!obj) goto err; drm_gem_private_object_init(&dev_priv->drm, &obj->base, stolen->size); i915_gem_object_init(obj, &i915_gem_object_stolen_ops); obj->stolen = stolen; obj->read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT; cache_level = HAS_LLC(dev_priv) ? I915_CACHE_LLC : I915_CACHE_NONE; i915_gem_object_set_cache_coherency(obj, cache_level); err = i915_gem_object_pin_pages(obj); if (err) goto cleanup; if (mem) i915_gem_object_init_memory_region(obj, mem, 0); return obj; cleanup: i915_gem_object_free(obj); err: return ERR_PTR(err); } static struct drm_i915_gem_object * _i915_gem_object_create_stolen(struct intel_memory_region *mem, resource_size_t size, unsigned int flags) { struct drm_i915_private *dev_priv = mem->i915; struct drm_i915_gem_object *obj; struct drm_mm_node *stolen; int ret; if (!drm_mm_initialized(&dev_priv->mm.stolen)) return ERR_PTR(-ENODEV); if (size == 0) return ERR_PTR(-EINVAL); stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); if (!stolen) return ERR_PTR(-ENOMEM); ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096); if (ret) { obj = ERR_PTR(ret); goto err_free; } obj = __i915_gem_object_create_stolen(dev_priv, stolen, mem); if (IS_ERR(obj)) goto err_remove; return obj; err_remove: i915_gem_stolen_remove_node(dev_priv, stolen); err_free: kfree(stolen); return obj; } struct drm_i915_gem_object * i915_gem_object_create_stolen(struct drm_i915_private *dev_priv, resource_size_t size) { return i915_gem_object_create_region(dev_priv->mm.regions[INTEL_REGION_STOLEN], size, I915_BO_ALLOC_CONTIGUOUS); } static int init_stolen(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->i915); } static void release_stolen(struct intel_memory_region *mem) { i915_gem_cleanup_stolen(mem->i915); } static const struct intel_memory_region_ops i915_region_stolen_ops = { .init = init_stolen, .release = release_stolen, .create_object = _i915_gem_object_create_stolen, }; struct intel_memory_region *i915_gem_stolen_setup(struct drm_i915_private *i915) { return intel_memory_region_create(i915, intel_graphics_stolen_res.start, resource_size(&intel_graphics_stolen_res), PAGE_SIZE, 0, &i915_region_stolen_ops); } struct drm_i915_gem_object * i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *dev_priv, resource_size_t stolen_offset, resource_size_t gtt_offset, resource_size_t size) { struct i915_ggtt *ggtt = &dev_priv->ggtt; struct drm_i915_gem_object *obj; struct drm_mm_node *stolen; struct i915_vma *vma; int ret; if (!drm_mm_initialized(&dev_priv->mm.stolen)) return ERR_PTR(-ENODEV); DRM_DEBUG_DRIVER("creating preallocated stolen object: stolen_offset=%pa, gtt_offset=%pa, size=%pa\n", &stolen_offset, >t_offset, &size); /* KISS and expect everything to be page-aligned */ if (WARN_ON(size == 0) || WARN_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE)) || WARN_ON(!IS_ALIGNED(stolen_offset, I915_GTT_MIN_ALIGNMENT))) 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(&dev_priv->mm.stolen_lock); ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen); mutex_unlock(&dev_priv->mm.stolen_lock); if (ret) { DRM_DEBUG_DRIVER("failed to allocate stolen space\n"); kfree(stolen); return ERR_PTR(ret); } obj = __i915_gem_object_create_stolen(dev_priv, stolen, NULL); if (IS_ERR(obj)) { DRM_DEBUG_DRIVER("failed to allocate stolen object\n"); i915_gem_stolen_remove_node(dev_priv, stolen); kfree(stolen); return obj; } /* Some objects just need physical mem from stolen space */ if (gtt_offset == I915_GTT_OFFSET_NONE) return obj; ret = i915_gem_object_pin_pages(obj); if (ret) goto err; vma = i915_vma_instance(obj, &ggtt->vm, NULL); if (IS_ERR(vma)) { ret = PTR_ERR(vma); goto err_pages; } /* To simplify the initialisation sequence between KMS and GTT, * we allow construction of the stolen object prior to * setting up the GTT space. The actual reservation will occur * later. */ mutex_lock(&ggtt->vm.mutex); ret = i915_gem_gtt_reserve(&ggtt->vm, &vma->node, size, gtt_offset, obj->cache_level, 0); if (ret) { DRM_DEBUG_DRIVER("failed to allocate stolen GTT space\n"); mutex_unlock(&ggtt->vm.mutex); goto err_pages; } GEM_BUG_ON(!drm_mm_node_allocated(&vma->node)); GEM_BUG_ON(vma->pages); vma->pages = obj->mm.pages; atomic_set(&vma->pages_count, I915_VMA_PAGES_ACTIVE); set_bit(I915_VMA_GLOBAL_BIND_BIT, __i915_vma_flags(vma)); __i915_vma_set_map_and_fenceable(vma); list_add_tail(&vma->vm_link, &ggtt->vm.bound_list); mutex_unlock(&ggtt->vm.mutex); GEM_BUG_ON(i915_gem_object_is_shrinkable(obj)); atomic_inc(&obj->bind_count); return obj; err_pages: i915_gem_object_unpin_pages(obj); err: i915_gem_object_put(obj); return ERR_PTR(ret); }