| /* |
| * 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 <eric@anholt.net> |
| * Chris Wilson <chris@chris-wilson.co.uk> |
| * |
| */ |
| |
| #include <drm/drmP.h> |
| #include <drm/i915_drm.h> |
| #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(struct drm_i915_private *dev_priv, |
| struct drm_mm_node *node, u64 size, |
| unsigned alignment) |
| { |
| int ret; |
| |
| if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
| return -ENODEV; |
| |
| mutex_lock(&dev_priv->mm.stolen_lock); |
| ret = drm_mm_insert_node(&dev_priv->mm.stolen, node, size, alignment, |
| DRM_MM_SEARCH_DEFAULT); |
| mutex_unlock(&dev_priv->mm.stolen_lock); |
| |
| return ret; |
| } |
| |
| 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); |
| } |
| |
| int i915_gem_init_stolen(struct drm_device *dev) |
| { |
| struct drm_i915_private *dev_priv = dev->dev_private; |
| u32 tmp; |
| int bios_reserved = 0; |
| |
| 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; |
| |
| DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n", |
| dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base); |
| |
| if (INTEL_INFO(dev)->gen >= 8) { |
| tmp = I915_READ(GEN7_BIOS_RESERVED); |
| tmp >>= GEN8_BIOS_RESERVED_SHIFT; |
| tmp &= GEN8_BIOS_RESERVED_MASK; |
| bios_reserved = (1024*1024) << tmp; |
| } else if (IS_GEN7(dev)) { |
| tmp = I915_READ(GEN7_BIOS_RESERVED); |
| bios_reserved = tmp & GEN7_BIOS_RESERVED_256K ? |
| 256*1024 : 1024*1024; |
| } |
| |
| if (WARN_ON(bios_reserved > dev_priv->gtt.stolen_size)) |
| return 0; |
| |
| /* Basic memrange allocator for stolen space */ |
| drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size - |
| bios_reserved); |
| |
| 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; |
| |
| obj->has_dma_mapping = true; |
| 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; |
| } |