/* * 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 "gt/intel_gt.h" #include "gt/intel_gt_mcr.h" #include "gt/intel_gt_regs.h" #include "gt/intel_region_lmem.h" #include "i915_drv.h" #include "i915_gem_stolen.h" #include "i915_pci.h" #include "i915_reg.h" #include "i915_utils.h" #include "i915_vgpu.h" #include "intel_mchbar_regs.h" #include "intel_pci_config.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 bool valid_stolen_size(struct drm_i915_private *i915, struct resource *dsm) { return (dsm->start != 0 || HAS_LMEMBAR_SMEM_STOLEN(i915)) && dsm->end > dsm->start; } static int adjust_stolen(struct drm_i915_private *i915, struct resource *dsm) { struct i915_ggtt *ggtt = to_gt(i915)->ggtt; struct intel_uncore *uncore = ggtt->vm.gt->uncore; if (!valid_stolen_size(i915, dsm)) return -EINVAL; /* * Make sure we don't clobber the GTT if it's within stolen memory * * 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. */ 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 = 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); } } if (!valid_stolen_size(i915, dsm)) return -EINVAL; return 0; } static int request_smem_stolen(struct drm_i915_private *i915, struct resource *dsm) { struct resource *r; /* * With stolen lmem, we don't need to request system memory for the * address range since it's local to the gpu. * * Starting MTL, in IGFX devices the stolen memory is exposed via * LMEMBAR and shall be considered similar to stolen lmem. */ if (HAS_LMEM(i915) || HAS_LMEMBAR_SMEM_STOLEN(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.stolen.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.stolen.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.stolen.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); /* Wa_14019821291 */ if (MEDIA_VER_FULL(i915) == IP_VER(13, 0)) { /* * This workaround is primarily implemented by the BIOS. We * just need to figure out whether the BIOS has applied the * workaround (meaning the programmed address falls within * the DSM) and, if so, reserve that part of the DSM to * prevent accidental reuse. The DSM location should be just * below the WOPCM. */ u64 gscpsmi_base = intel_uncore_read64_2x32(uncore, MTL_GSCPSMI_BASEADDR_LSB, MTL_GSCPSMI_BASEADDR_MSB); if (gscpsmi_base >= i915->dsm.stolen.start && gscpsmi_base < i915->dsm.stolen.end) { *base = gscpsmi_base; *size = i915->dsm.stolen.end - gscpsmi_base; return; } } 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); } if (HAS_LMEMBAR_SMEM_STOLEN(i915)) /* the base is initialized to stolen top so subtract size to get base */ *base -= *size; else *base = reg_val & GEN11_STOLEN_RESERVED_ADDR_MASK; } /* * Initialize i915->dsm.reserved to contain the reserved space within the Data * Stolen Memory. This is a range on the top of DSM that is reserved, not to * be used by driver, so must be excluded from the region passed to the * allocator later. In the spec this is also called as WOPCM. * * Our expectation is that the reserved space is at the top of the stolen * region, as it has been the case for every platform, and *never* at the * bottom, so the calculation here can be simplified. */ static int init_reserved_stolen(struct drm_i915_private *i915) { struct intel_uncore *uncore = &i915->uncore; resource_size_t reserved_base, stolen_top; resource_size_t reserved_size; int ret = 0; stolen_top = i915->dsm.stolen.end + 1; reserved_base = stolen_top; reserved_size = 0; if (GRAPHICS_VER(i915) >= 11) { icl_get_stolen_reserved(i915, uncore, &reserved_base, &reserved_size); } else if (GRAPHICS_VER(i915) >= 8) { 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); } else if (GRAPHICS_VER(i915) >= 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); } else if (GRAPHICS_VER(i915) >= 6) { gen6_get_stolen_reserved(i915, uncore, &reserved_base, &reserved_size); } else if (GRAPHICS_VER(i915) >= 5 || IS_G4X(i915)) { g4x_get_stolen_reserved(i915, uncore, &reserved_base, &reserved_size); } /* No reserved stolen */ if (reserved_base == stolen_top) goto bail_out; if (!reserved_base) { drm_err(&i915->drm, "inconsistent reservation %pa + %pa; ignoring\n", &reserved_base, &reserved_size); ret = -EINVAL; goto bail_out; } i915->dsm.reserved = DEFINE_RES_MEM(reserved_base, reserved_size); if (!resource_contains(&i915->dsm.stolen, &i915->dsm.reserved)) { drm_err(&i915->drm, "Stolen reserved area %pR outside stolen memory %pR\n", &i915->dsm.reserved, &i915->dsm.stolen); ret = -EINVAL; goto bail_out; } return 0; bail_out: i915->dsm.reserved = DEFINE_RES_MEM(reserved_base, 0); return ret; } static int i915_gem_init_stolen(struct intel_memory_region *mem) { struct drm_i915_private *i915 = mem->i915; 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 -ENOSPC; } if (i915_vtd_active(i915) && GRAPHICS_VER(i915) < 8) { drm_notice(&i915->drm, "%s, disabling use of stolen memory\n", "DMAR active"); return -ENOSPC; } if (adjust_stolen(i915, &mem->region)) return -ENOSPC; if (request_smem_stolen(i915, &mem->region)) return -ENOSPC; i915->dsm.stolen = mem->region; if (init_reserved_stolen(i915)) return -ENOSPC; /* Exclude the reserved region from driver use */ mem->region.end = i915->dsm.reserved.start - 1; mem->io = DEFINE_RES_MEM(mem->io.start, min(resource_size(&mem->io), resource_size(&mem->region))); i915->dsm.usable_size = resource_size(&mem->region); drm_dbg(&i915->drm, "Memory reserved for graphics device: %lluK, usable: %lluK\n", (u64)resource_size(&i915->dsm.stolen) >> 10, (u64)i915->dsm.usable_size >> 10); if (i915->dsm.usable_size == 0) return -ENOSPC; /* Basic memrange allocator for stolen space. */ drm_mm_init(&i915->mm.stolen, 0, i915->dsm.usable_size); /* * Access to stolen lmem beyond certain size for MTL A0 stepping * would crash the machine. Disable stolen lmem for userspace access * by setting usable_size to zero. */ if (IS_METEORLAKE(i915) && INTEL_REVID(i915) == 0x0) i915->dsm.usable_size = 0; 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_gem_get_pat_index(ggtt->vm.i915, 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.stolen))); /* 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.stolen.start + offset; sg_dma_len(sg) = size; return st; } static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj) { struct drm_i915_private *i915 = to_i915(obj->base.dev); 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_gt(i915)->ggtt, sg_dma_address(pages->sgl), sg_dma_len(pages->sgl), POISON_INUSE); __i915_gem_object_set_pages(obj, pages); return 0; } static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj, struct sg_table *pages) { struct drm_i915_private *i915 = to_i915(obj->base.dev); /* Should only be called from i915_gem_object_release_stolen() */ dbg_poison(to_gt(i915)->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, NULL))) 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 offset, 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; /* * With discrete devices, where we lack a mappable aperture there is no * possible way to ever access this memory on the CPU side. */ if (mem->type == INTEL_MEMORY_STOLEN_LOCAL && !resource_size(&mem->io) && !(flags & I915_BO_ALLOC_GPU_ONLY)) return -ENOSPC; stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); if (!stolen) return -ENOMEM; if (offset != I915_BO_INVALID_OFFSET) { drm_dbg(&i915->drm, "creating preallocated stolen object: stolen_offset=%pa, size=%pa\n", &offset, &size); stolen->start = 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); } else { 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) { int err; /* * Initialise stolen early so that we may reserve preallocated * objects for the BIOS to KMS transition. */ err = i915_gem_init_stolen(mem); if (err) drm_dbg(&mem->i915->drm, "Skip stolen region: failed to setup\n"); return 0; } static int release_stolen_smem(struct intel_memory_region *mem) { i915_gem_cleanup_stolen(mem->i915); return 0; } 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 0; err = i915_gem_init_stolen(mem); if (err) { drm_dbg(&mem->i915->drm, "Skip stolen region: failed to setup\n"); return 0; } if (resource_size(&mem->io) && !io_mapping_init_wc(&mem->iomap, mem->io.start, resource_size(&mem->io))) goto err_cleanup; return 0; err_cleanup: i915_gem_cleanup_stolen(mem->i915); return err; } static int release_stolen_lmem(struct intel_memory_region *mem) { if (resource_size(&mem->io)) io_mapping_fini(&mem->iomap); i915_gem_cleanup_stolen(mem->i915); return 0; } 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, }; static int mtl_get_gms_size(struct intel_uncore *uncore) { u16 ggc, gms; ggc = intel_uncore_read16(uncore, GGC); /* check GGMS, should be fixed 0x3 (8MB) */ if ((ggc & GGMS_MASK) != GGMS_MASK) return -EIO; /* return valid GMS value, -EIO if invalid */ gms = REG_FIELD_GET(GMS_MASK, ggc); switch (gms) { case 0x0 ... 0x04: return gms * 32; case 0xf0 ... 0xfe: return (gms - 0xf0 + 1) * 4; default: MISSING_CASE(gms); return -EIO; } } 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); resource_size_t dsm_size, dsm_base, lmem_size; struct intel_memory_region *mem; resource_size_t io_start, io_size; resource_size_t min_page_size; int ret; if (WARN_ON_ONCE(instance)) return ERR_PTR(-ENODEV); if (!i915_pci_resource_valid(pdev, GEN12_LMEM_BAR)) return ERR_PTR(-ENXIO); if (HAS_LMEMBAR_SMEM_STOLEN(i915) || IS_DG1(i915)) { lmem_size = pci_resource_len(pdev, GEN12_LMEM_BAR); } else { resource_size_t lmem_range; lmem_range = intel_gt_mcr_read_any(to_gt(i915), XEHP_TILE0_ADDR_RANGE) & 0xFFFF; lmem_size = lmem_range >> XEHP_TILE_LMEM_RANGE_SHIFT; lmem_size *= SZ_1G; } if (HAS_LMEMBAR_SMEM_STOLEN(i915)) { /* * MTL dsm size is in GGC register. * Also MTL uses offset to GSMBASE in ptes, so i915 * uses dsm_base = 8MBs to setup stolen region, since * DSMBASE = GSMBASE + 8MB. */ ret = mtl_get_gms_size(uncore); if (ret < 0) { drm_err(&i915->drm, "invalid MTL GGC register setting\n"); return ERR_PTR(ret); } dsm_base = SZ_8M; dsm_size = (resource_size_t)(ret * SZ_1M); GEM_BUG_ON(pci_resource_len(pdev, GEN12_LMEM_BAR) != SZ_256M); GEM_BUG_ON((dsm_base + dsm_size) > lmem_size); } else { /* Use DSM base address instead for stolen memory */ dsm_base = intel_uncore_read64(uncore, GEN6_DSMBASE) & GEN11_BDSM_MASK; if (WARN_ON(lmem_size < dsm_base)) return ERR_PTR(-ENODEV); dsm_size = ALIGN_DOWN(lmem_size - dsm_base, SZ_1M); } if (i915_direct_stolen_access(i915)) { drm_dbg(&i915->drm, "Using direct DSM access\n"); io_start = intel_uncore_read64(uncore, GEN6_DSMBASE) & GEN11_BDSM_MASK; io_size = dsm_size; } else if (pci_resource_len(pdev, GEN12_LMEM_BAR) < lmem_size) { io_start = 0; io_size = 0; } else { io_start = pci_resource_start(pdev, GEN12_LMEM_BAR) + dsm_base; io_size = dsm_size; } min_page_size = HAS_64K_PAGES(i915) ? I915_GTT_PAGE_SIZE_64K : I915_GTT_PAGE_SIZE_4K; mem = intel_memory_region_create(i915, dsm_base, dsm_size, min_page_size, io_start, io_size, type, instance, &i915_region_stolen_lmem_ops); if (IS_ERR(mem)) return mem; 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, 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; } bool i915_gem_object_is_stolen(const struct drm_i915_gem_object *obj) { return obj->ops == &i915_gem_object_stolen_ops; } bool i915_gem_stolen_initialized(const struct drm_i915_private *i915) { return drm_mm_initialized(&i915->mm.stolen); } u64 i915_gem_stolen_area_address(const struct drm_i915_private *i915) { return i915->dsm.stolen.start; } u64 i915_gem_stolen_area_size(const struct drm_i915_private *i915) { return resource_size(&i915->dsm.stolen); } u64 i915_gem_stolen_node_address(const struct drm_i915_private *i915, const struct drm_mm_node *node) { return i915->dsm.stolen.start + i915_gem_stolen_node_offset(node); } bool i915_gem_stolen_node_allocated(const struct drm_mm_node *node) { return drm_mm_node_allocated(node); } u64 i915_gem_stolen_node_offset(const struct drm_mm_node *node) { return node->start; } u64 i915_gem_stolen_node_size(const struct drm_mm_node *node) { return node->size; }