| /* |
| * 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" |
| |
| #define KB(x) ((x) * 1024) |
| #define MB(x) (KB(x) * 1024) |
| |
| /* |
| * 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; |
| |
| /* See the comment at the drm_mm_init() call for more about this check. |
| * WaSkipStolenMemoryFirstPage:bdw,chv,kbl (incomplete) |
| */ |
| if (start < 4096 && (IS_GEN8(dev_priv) || |
| IS_KBL_REVID(dev_priv, 0, KBL_REVID_A0))) |
| start = 4096; |
| |
| 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) |
| { |
| struct i915_ggtt *ggtt = &dev_priv->ggtt; |
| |
| return i915_gem_stolen_insert_node_in_range(dev_priv, node, size, |
| alignment, 0, |
| ggtt->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 = to_i915(dev); |
| struct i915_ggtt *ggtt = &dev_priv->ggtt; |
| struct resource *r; |
| u32 base; |
| |
| /* Almost universally we can find the Graphics Base of Stolen Memory |
| * at register BSM (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 865 we just check the TOUD register. |
| * |
| * On 830/845/85x the stolen memory base isn't available in any |
| * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size. |
| * |
| */ |
| base = 0; |
| if (INTEL_INFO(dev)->gen >= 3) { |
| u32 bsm; |
| |
| pci_read_config_dword(dev->pdev, INTEL_BSM, &bsm); |
| |
| base = bsm & INTEL_BSM_MASK; |
| } else if (IS_I865G(dev)) { |
| u16 toud = 0; |
| |
| /* |
| * FIXME is the graphics stolen memory region |
| * always at TOUD? Ie. is it always the last |
| * one to be allocated by the BIOS? |
| */ |
| pci_bus_read_config_word(dev->pdev->bus, PCI_DEVFN(0, 0), |
| I865_TOUD, &toud); |
| |
| base = toud << 16; |
| } else if (IS_I85X(dev)) { |
| u32 tseg_size = 0; |
| u32 tom; |
| u8 tmp; |
| |
| pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0), |
| I85X_ESMRAMC, &tmp); |
| |
| if (tmp & TSEG_ENABLE) |
| tseg_size = MB(1); |
| |
| pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 1), |
| I85X_DRB3, &tmp); |
| tom = tmp * MB(32); |
| |
| base = tom - tseg_size - ggtt->stolen_size; |
| } else if (IS_845G(dev)) { |
| u32 tseg_size = 0; |
| u32 tom; |
| u8 tmp; |
| |
| pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0), |
| I845_ESMRAMC, &tmp); |
| |
| if (tmp & TSEG_ENABLE) { |
| switch (tmp & I845_TSEG_SIZE_MASK) { |
| case I845_TSEG_SIZE_512K: |
| tseg_size = KB(512); |
| break; |
| case I845_TSEG_SIZE_1M: |
| tseg_size = MB(1); |
| break; |
| } |
| } |
| |
| pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0), |
| I830_DRB3, &tmp); |
| tom = tmp * MB(32); |
| |
| base = tom - tseg_size - ggtt->stolen_size; |
| } else if (IS_I830(dev)) { |
| u32 tseg_size = 0; |
| u32 tom; |
| u8 tmp; |
| |
| pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0), |
| I830_ESMRAMC, &tmp); |
| |
| if (tmp & TSEG_ENABLE) { |
| if (tmp & I830_TSEG_SIZE_1M) |
| tseg_size = MB(1); |
| else |
| tseg_size = KB(512); |
| } |
| |
| pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0), |
| I830_DRB3, &tmp); |
| tom = tmp * MB(32); |
| |
| base = tom - tseg_size - ggtt->stolen_size; |
| } |
| |
| 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 + ggtt->stolen_size, }, |
| { .start = base, .end = base + ggtt->stolen_size, }, |
| }; |
| u64 ggtt_start, ggtt_end; |
| |
| ggtt_start = I915_READ(PGTBL_CTL); |
| if (IS_GEN4(dev)) |
| ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) | |
| (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28; |
| else |
| ggtt_start &= PGTBL_ADDRESS_LO_MASK; |
| ggtt_end = ggtt_start + ggtt_total_entries(ggtt) * 4; |
| |
| if (ggtt_start >= stolen[0].start && ggtt_start < stolen[0].end) |
| stolen[0].end = ggtt_start; |
| if (ggtt_end > stolen[1].start && ggtt_end <= stolen[1].end) |
| stolen[1].start = ggtt_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; |
| ggtt->stolen_size = stolen[0].end - stolen[0].start; |
| } else { |
| base = stolen[1].start; |
| ggtt->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)ggtt_start, |
| (unsigned long long)ggtt_end - 1); |
| DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n", |
| base, base + (u32)ggtt->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, ggtt->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, |
| ggtt->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)ggtt->stolen_size); |
| base = 0; |
| } |
| } |
| |
| return base; |
| } |
| |
| void i915_gem_cleanup_stolen(struct drm_device *dev) |
| { |
| struct drm_i915_private *dev_priv = to_i915(dev); |
| |
| 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, |
| unsigned long *base, unsigned long *size) |
| { |
| struct i915_ggtt *ggtt = &dev_priv->ggtt; |
| uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ? |
| CTG_STOLEN_RESERVED : |
| ELK_STOLEN_RESERVED); |
| unsigned long stolen_top = dev_priv->mm.stolen_base + |
| ggtt->stolen_size; |
| |
| *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16; |
| |
| WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base); |
| |
| /* 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; |
| } |
| |
| 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) |
| { |
| struct i915_ggtt *ggtt = &dev_priv->ggtt; |
| uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED); |
| unsigned long stolen_top; |
| |
| stolen_top = dev_priv->mm.stolen_base + ggtt->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 = to_i915(dev); |
| struct i915_ggtt *ggtt = &dev_priv->ggtt; |
| 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 (ggtt->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 + ggtt->stolen_size; |
| |
| switch (INTEL_INFO(dev_priv)->gen) { |
| case 2: |
| case 3: |
| break; |
| case 4: |
| if (IS_G4X(dev)) |
| g4x_get_stolen_reserved(dev_priv, &reserved_base, |
| &reserved_size); |
| break; |
| 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) || IS_KABYLAKE(dev)) |
| 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; |
| } |
| |
| ggtt->stolen_reserved_base = reserved_base; |
| ggtt->stolen_reserved_size = reserved_size; |
| |
| /* 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", |
| ggtt->stolen_size >> 10, |
| (ggtt->stolen_size - reserved_total) >> 10); |
| |
| ggtt->stolen_usable_size = ggtt->stolen_size - reserved_total; |
| |
| /* |
| * Basic memrange allocator for stolen space. |
| * |
| * TODO: Notice that some platforms require us to not use the first page |
| * of the stolen memory but their BIOSes may still put the framebuffer |
| * on the first page. So we don't reserve this page for now because of |
| * that. Our current solution is to just prevent new nodes from being |
| * inserted on the first page - see the check we have at |
| * i915_gem_stolen_insert_node_in_range(). We may want to fix the fbcon |
| * problem later. |
| */ |
| drm_mm_init(&dev_priv->mm.stolen, 0, ggtt->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 = to_i915(dev); |
| struct i915_ggtt *ggtt = &dev_priv->ggtt; |
| struct sg_table *st; |
| struct scatterlist *sg; |
| |
| DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size); |
| BUG_ON(offset > ggtt->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 = to_i915(obj->base.dev); |
| |
| 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->get_page.sg = obj->pages->sgl; |
| obj->get_page.last = 0; |
| |
| 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 = to_i915(dev); |
| 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 = to_i915(dev); |
| 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 NULL; |
| |
| lockdep_assert_held(&dev->struct_mutex); |
| |
| 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->base); |
| if (IS_ERR(vma)) { |
| ret = PTR_ERR(vma); |
| goto err; |
| } |
| |
| /* 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->base.mm)) { |
| ret = drm_mm_reserve_node(&ggtt->base.mm, &vma->node); |
| if (ret) { |
| DRM_DEBUG_KMS("failed to allocate stolen GTT space\n"); |
| goto err; |
| } |
| |
| vma->bound |= GLOBAL_BIND; |
| __i915_vma_set_map_and_fenceable(vma); |
| list_add_tail(&vma->vm_link, &ggtt->base.inactive_list); |
| } |
| |
| list_add_tail(&obj->global_list, &dev_priv->mm.bound_list); |
| i915_gem_object_pin_pages(obj); |
| |
| return obj; |
| |
| err: |
| drm_gem_object_unreference(&obj->base); |
| return NULL; |
| } |