diff options
Diffstat (limited to 'drivers/gpu/drm/i915/gem/i915_gem_stolen.c')
| -rw-r--r-- | drivers/gpu/drm/i915/gem/i915_gem_stolen.c | 1012 |
1 files changed, 1012 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c new file mode 100644 index 0000000000..1a766d8e7c --- /dev/null +++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c @@ -0,0 +1,1012 @@ +/* + * SPDX-License-Identifier: MIT + * + * Copyright © 2008-2012 Intel Corporation + */ + +#include <linux/errno.h> +#include <linux/mutex.h> + +#include <drm/drm_mm.h> +#include <drm/i915_drm.h> + +#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); + + 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_size = min(mem->io_size, 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 && !mem->io_size && + !(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) +{ + struct drm_i915_private *i915 = mem->i915; + 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 (mem->io_size && + !io_mapping_init_wc(&mem->iomap, mem->io_start, mem->io_size)) + goto err_cleanup; + + drm_dbg(&i915->drm, "Stolen Local memory IO start: %pa\n", + &mem->io_start); + drm_dbg(&i915->drm, "Stolen Local DSM base: %pa\n", &mem->region.start); + + return 0; + +err_cleanup: + i915_gem_cleanup_stolen(mem->i915); + return err; +} + +static int release_stolen_lmem(struct intel_memory_region *mem) +{ + if (mem->io_size) + 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, GEN12_DSMBASE) & GEN12_BDSM_MASK; + if (WARN_ON(lmem_size < dsm_base)) + return ERR_PTR(-ENODEV); + dsm_size = ALIGN_DOWN(lmem_size - dsm_base, SZ_1M); + } + + 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; +} |