/* * Copyright © 2008-2012 Intel Corporation * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. * * Authors: * Eric Anholt * Chris Wilson * */ #include #include #include "i915_drv.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; mutex_lock(&dev_priv->mm.stolen_lock); ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node, size, alignment, start, end, DRM_MM_SEARCH_DEFAULT); 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, dev_priv->gtt.stolen_usable_size); } 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 unsigned long i915_stolen_to_physical(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; struct resource *r; u32 base; /* Almost universally we can find the Graphics Base of Stolen Memory * at offset 0x5c in the igfx configuration space. On a few (desktop) * machines this is also mirrored in the bridge device at different * locations, or in the MCHBAR. On gen2, the layout is again slightly * different with the Graphics Segment immediately following Top of * Memory (or Top of Usable DRAM). Note it appears that TOUD is only * reported by 865g, so we just use the top of memory as determined * by the e820 probe. * * XXX However gen2 requires an unavailable symbol. */ base = 0; if (INTEL_INFO(dev)->gen >= 3) { /* Read Graphics Base of Stolen Memory directly */ pci_read_config_dword(dev->pdev, 0x5c, &base); base &= ~((1<<20) - 1); } else { /* GEN2 */ #if 0 /* Stolen is immediately above Top of Memory */ base = max_low_pfn_mapped << PAGE_SHIFT; #endif } if (base == 0) return 0; /* make sure we don't clobber the GTT if it's within stolen memory */ if (INTEL_INFO(dev)->gen <= 4 && !IS_G33(dev) && !IS_G4X(dev)) { struct { u32 start, end; } stolen[2] = { { .start = base, .end = base + dev_priv->gtt.stolen_size, }, { .start = base, .end = base + dev_priv->gtt.stolen_size, }, }; u64 gtt_start, gtt_end; gtt_start = I915_READ(PGTBL_CTL); if (IS_GEN4(dev)) gtt_start = (gtt_start & PGTBL_ADDRESS_LO_MASK) | (gtt_start & PGTBL_ADDRESS_HI_MASK) << 28; else gtt_start &= PGTBL_ADDRESS_LO_MASK; gtt_end = gtt_start + gtt_total_entries(dev_priv->gtt) * 4; if (gtt_start >= stolen[0].start && gtt_start < stolen[0].end) stolen[0].end = gtt_start; if (gtt_end > stolen[1].start && gtt_end <= stolen[1].end) stolen[1].start = gtt_end; /* pick the larger of the two chunks */ if (stolen[0].end - stolen[0].start > stolen[1].end - stolen[1].start) { base = stolen[0].start; dev_priv->gtt.stolen_size = stolen[0].end - stolen[0].start; } else { base = stolen[1].start; dev_priv->gtt.stolen_size = stolen[1].end - stolen[1].start; } if (stolen[0].start != stolen[1].start || stolen[0].end != stolen[1].end) { DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n", (unsigned long long) gtt_start, (unsigned long long) gtt_end - 1); DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n", base, base + (u32) dev_priv->gtt.stolen_size - 1); } } /* 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->dev, base, dev_priv->gtt.stolen_size, "Graphics Stolen Memory"); if (r == NULL) { /* * One more attempt but this time requesting region from * base + 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. */ r = devm_request_mem_region(dev->dev, base + 1, dev_priv->gtt.stolen_size - 1, "Graphics Stolen Memory"); /* * GEN3 firmware likes to smash pci bridges into the stolen * range. Apparently this works. */ if (r == NULL && !IS_GEN3(dev)) { DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n", base, base + (uint32_t)dev_priv->gtt.stolen_size); base = 0; } } return base; } void i915_gem_cleanup_stolen(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; if (!drm_mm_initialized(&dev_priv->mm.stolen)) return; drm_mm_takedown(&dev_priv->mm.stolen); } static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv, unsigned long *base, unsigned long *size) { uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED); *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 gen7_get_stolen_reserved(struct drm_i915_private *dev_priv, unsigned long *base, unsigned long *size) { uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED); *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 gen8_get_stolen_reserved(struct drm_i915_private *dev_priv, unsigned long *base, unsigned long *size) { uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED); *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, unsigned long *base, unsigned long *size) { uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED); unsigned long stolen_top; stolen_top = dev_priv->mm.stolen_base + dev_priv->gtt.stolen_size; *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; /* On these platforms, the register doesn't have a size field, so the * size is the distance between the base and the top of the stolen * memory. We also have the genuine case where base is zero and there's * nothing reserved. */ if (*base == 0) *size = 0; else *size = stolen_top - *base; } int i915_gem_init_stolen(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; unsigned long reserved_total, reserved_base = 0, reserved_size; unsigned long stolen_top; mutex_init(&dev_priv->mm.stolen_lock); #ifdef CONFIG_INTEL_IOMMU if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) { DRM_INFO("DMAR active, disabling use of stolen memory\n"); return 0; } #endif if (dev_priv->gtt.stolen_size == 0) return 0; dev_priv->mm.stolen_base = i915_stolen_to_physical(dev); if (dev_priv->mm.stolen_base == 0) return 0; stolen_top = dev_priv->mm.stolen_base + dev_priv->gtt.stolen_size; switch (INTEL_INFO(dev_priv)->gen) { case 2: case 3: case 4: if (!IS_G4X(dev)) break; /* fall through */ case 5: /* Assume the gen6 maximum for the older platforms. */ reserved_size = 1024 * 1024; reserved_base = stolen_top - reserved_size; break; case 6: gen6_get_stolen_reserved(dev_priv, &reserved_base, &reserved_size); break; case 7: gen7_get_stolen_reserved(dev_priv, &reserved_base, &reserved_size); break; default: if (IS_BROADWELL(dev_priv) || IS_SKYLAKE(dev_priv)) bdw_get_stolen_reserved(dev_priv, &reserved_base, &reserved_size); else gen8_get_stolen_reserved(dev_priv, &reserved_base, &reserved_size); break; } /* It is possible for the reserved base to be zero, but the register * field for size doesn't have a zero option. */ if (reserved_base == 0) { reserved_size = 0; reserved_base = stolen_top; } if (reserved_base < dev_priv->mm.stolen_base || reserved_base + reserved_size > stolen_top) { DRM_DEBUG_KMS("Stolen reserved area [0x%08lx - 0x%08lx] outside stolen memory [0x%08lx - 0x%08lx]\n", reserved_base, reserved_base + reserved_size, dev_priv->mm.stolen_base, stolen_top); 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_KMS("Memory reserved for graphics device: %zuK, usable: %luK\n", dev_priv->gtt.stolen_size >> 10, (dev_priv->gtt.stolen_size - reserved_total) >> 10); dev_priv->gtt.stolen_usable_size = dev_priv->gtt.stolen_size - reserved_total; /* Basic memrange allocator for stolen space */ drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_usable_size); return 0; } static struct sg_table * i915_pages_create_for_stolen(struct drm_device *dev, u32 offset, u32 size) { struct drm_i915_private *dev_priv = dev->dev_private; struct sg_table *st; struct scatterlist *sg; DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size); BUG_ON(offset > dev_priv->gtt.stolen_size - size); /* 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 NULL; if (sg_alloc_table(st, 1, GFP_KERNEL)) { kfree(st); return NULL; } sg = st->sgl; sg->offset = 0; sg->length = size; sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset; sg_dma_len(sg) = size; return st; } static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj) { BUG(); return -EINVAL; } static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj) { /* Should only be called during free */ sg_free_table(obj->pages); kfree(obj->pages); } static void i915_gem_object_release_stolen(struct drm_i915_gem_object *obj) { struct drm_i915_private *dev_priv = obj->base.dev->dev_private; if (obj->stolen) { i915_gem_stolen_remove_node(dev_priv, obj->stolen); kfree(obj->stolen); obj->stolen = NULL; } } 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_device *dev, struct drm_mm_node *stolen) { struct drm_i915_gem_object *obj; obj = i915_gem_object_alloc(dev); if (obj == NULL) return NULL; drm_gem_private_object_init(dev, &obj->base, stolen->size); i915_gem_object_init(obj, &i915_gem_object_stolen_ops); obj->pages = i915_pages_create_for_stolen(dev, stolen->start, stolen->size); if (obj->pages == NULL) goto cleanup; i915_gem_object_pin_pages(obj); obj->stolen = stolen; obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT; obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE; return obj; cleanup: i915_gem_object_free(obj); return NULL; } struct drm_i915_gem_object * i915_gem_object_create_stolen(struct drm_device *dev, u32 size) { struct drm_i915_private *dev_priv = dev->dev_private; struct drm_i915_gem_object *obj; struct drm_mm_node *stolen; int ret; if (!drm_mm_initialized(&dev_priv->mm.stolen)) return NULL; DRM_DEBUG_KMS("creating stolen object: size=%x\n", size); if (size == 0) return NULL; stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); if (!stolen) return NULL; ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096); if (ret) { kfree(stolen); return NULL; } obj = _i915_gem_object_create_stolen(dev, stolen); if (obj) return obj; i915_gem_stolen_remove_node(dev_priv, stolen); kfree(stolen); return NULL; } struct drm_i915_gem_object * i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev, u32 stolen_offset, u32 gtt_offset, u32 size) { struct drm_i915_private *dev_priv = dev->dev_private; struct i915_address_space *ggtt = &dev_priv->gtt.base; 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 NULL; DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n", stolen_offset, gtt_offset, size); /* KISS and expect everything to be page-aligned */ if (WARN_ON(size == 0) || WARN_ON(size & 4095) || WARN_ON(stolen_offset & 4095)) return NULL; stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); if (!stolen) return NULL; 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_KMS("failed to allocate stolen space\n"); kfree(stolen); return NULL; } obj = _i915_gem_object_create_stolen(dev, stolen); if (obj == NULL) { DRM_DEBUG_KMS("failed to allocate stolen object\n"); i915_gem_stolen_remove_node(dev_priv, stolen); kfree(stolen); return NULL; } /* Some objects just need physical mem from stolen space */ if (gtt_offset == I915_GTT_OFFSET_NONE) return obj; vma = i915_gem_obj_lookup_or_create_vma(obj, ggtt); if (IS_ERR(vma)) { ret = PTR_ERR(vma); goto err_out; } /* 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. */ vma->node.start = gtt_offset; vma->node.size = size; if (drm_mm_initialized(&ggtt->mm)) { ret = drm_mm_reserve_node(&ggtt->mm, &vma->node); if (ret) { DRM_DEBUG_KMS("failed to allocate stolen GTT space\n"); goto err_vma; } } vma->bound |= GLOBAL_BIND; list_add_tail(&obj->global_list, &dev_priv->mm.bound_list); list_add_tail(&vma->mm_list, &ggtt->inactive_list); i915_gem_object_pin_pages(obj); return obj; err_vma: i915_gem_vma_destroy(vma); err_out: i915_gem_stolen_remove_node(dev_priv, stolen); kfree(stolen); drm_gem_object_unreference(&obj->base); return NULL; }