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0703f59264
kolibrios-gitea/drivers/video/drm/i915/i915_gem_gtt.c
Sergey Semyonov (Serge) 0703f59264 drm i915: 3.17-rc2 
git-svn-id: svn://kolibrios.org@5060 a494cfbc-eb01-0410-851d-a64ba20cac60
2014-08-26 10:13:45 +00:00

2300 lines
62 KiB
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/*
* Copyright © 2010 Daniel Vetter
* Copyright © 2011-2014 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.
*
*/
#define AGP_NORMAL_MEMORY 0
#define AGP_USER_TYPES (1 << 16)
#define AGP_USER_MEMORY (AGP_USER_TYPES)
#define AGP_USER_CACHED_MEMORY (AGP_USER_TYPES + 1)
#include <drm/drmP.h>
#include <drm/i915_drm.h>
#include "i915_drv.h"
#include "i915_trace.h"
#include "intel_drv.h"
static void bdw_setup_private_ppat(struct drm_i915_private *dev_priv);
static void chv_setup_private_ppat(struct drm_i915_private *dev_priv);
bool intel_enable_ppgtt(struct drm_device *dev, bool full)
{
if (i915.enable_ppgtt == 0)
return false;
if (i915.enable_ppgtt == 1 && full)
return false;
return true;
}
static int sanitize_enable_ppgtt(struct drm_device *dev, int enable_ppgtt)
{
if (enable_ppgtt == 0 || !HAS_ALIASING_PPGTT(dev))
return 0;
if (enable_ppgtt == 1)
return 1;
if (enable_ppgtt == 2 && HAS_PPGTT(dev))
return 2;
#ifdef CONFIG_INTEL_IOMMU
/* Disable ppgtt on SNB if VT-d is on. */
if (INTEL_INFO(dev)->gen == 6 && intel_iommu_gfx_mapped) {
DRM_INFO("Disabling PPGTT because VT-d is on\n");
return 0;
}
#endif
/* Early VLV doesn't have this */
if (IS_VALLEYVIEW(dev) && !IS_CHERRYVIEW(dev) &&
dev->pdev->revision < 0xb) {
DRM_DEBUG_DRIVER("disabling PPGTT on pre-B3 step VLV\n");
return 0;
}
return HAS_ALIASING_PPGTT(dev) ? 1 : 0;
}
static void ppgtt_bind_vma(struct i915_vma *vma,
enum i915_cache_level cache_level,
u32 flags);
static void ppgtt_unbind_vma(struct i915_vma *vma);
static int gen8_ppgtt_enable(struct i915_hw_ppgtt *ppgtt);
static inline gen8_gtt_pte_t gen8_pte_encode(dma_addr_t addr,
enum i915_cache_level level,
bool valid)
{
gen8_gtt_pte_t pte = valid ? _PAGE_PRESENT | _PAGE_RW : 0;
pte |= addr;
switch (level) {
case I915_CACHE_NONE:
pte |= PPAT_UNCACHED_INDEX;
break;
case I915_CACHE_WT:
pte |= PPAT_DISPLAY_ELLC_INDEX;
break;
default:
pte |= PPAT_CACHED_INDEX;
break;
}
return pte;
}
static inline gen8_ppgtt_pde_t gen8_pde_encode(struct drm_device *dev,
dma_addr_t addr,
enum i915_cache_level level)
{
gen8_ppgtt_pde_t pde = _PAGE_PRESENT | _PAGE_RW;
pde |= addr;
if (level != I915_CACHE_NONE)
pde |= PPAT_CACHED_PDE_INDEX;
else
pde |= PPAT_UNCACHED_INDEX;
return pde;
}
static gen6_gtt_pte_t snb_pte_encode(dma_addr_t addr,
enum i915_cache_level level,
bool valid, u32 unused)
{
gen6_gtt_pte_t pte = valid ? GEN6_PTE_VALID : 0;
pte |= GEN6_PTE_ADDR_ENCODE(addr);
switch (level) {
case I915_CACHE_L3_LLC:
case I915_CACHE_LLC:
pte |= GEN6_PTE_CACHE_LLC;
break;
case I915_CACHE_NONE:
pte |= GEN6_PTE_UNCACHED;
break;
default:
WARN_ON(1);
}
return pte;
}
static gen6_gtt_pte_t ivb_pte_encode(dma_addr_t addr,
enum i915_cache_level level,
bool valid, u32 unused)
{
gen6_gtt_pte_t pte = valid ? GEN6_PTE_VALID : 0;
pte |= GEN6_PTE_ADDR_ENCODE(addr);
switch (level) {
case I915_CACHE_L3_LLC:
pte |= GEN7_PTE_CACHE_L3_LLC;
break;
case I915_CACHE_LLC:
pte |= GEN6_PTE_CACHE_LLC;
break;
case I915_CACHE_NONE:
pte |= GEN6_PTE_UNCACHED;
break;
default:
WARN_ON(1);
}
return pte;
}
static gen6_gtt_pte_t byt_pte_encode(dma_addr_t addr,
enum i915_cache_level level,
bool valid, u32 flags)
{
gen6_gtt_pte_t pte = valid ? GEN6_PTE_VALID : 0;
pte |= GEN6_PTE_ADDR_ENCODE(addr);
/* Mark the page as writeable. Other platforms don't have a
* setting for read-only/writable, so this matches that behavior.
*/
if (!(flags & PTE_READ_ONLY))
pte |= BYT_PTE_WRITEABLE;
if (level != I915_CACHE_NONE)
pte |= BYT_PTE_SNOOPED_BY_CPU_CACHES;
return pte;
}
static gen6_gtt_pte_t hsw_pte_encode(dma_addr_t addr,
enum i915_cache_level level,
bool valid, u32 unused)
{
gen6_gtt_pte_t pte = valid ? GEN6_PTE_VALID : 0;
pte |= HSW_PTE_ADDR_ENCODE(addr);
if (level != I915_CACHE_NONE)
pte |= HSW_WB_LLC_AGE3;
return pte;
}
static gen6_gtt_pte_t iris_pte_encode(dma_addr_t addr,
enum i915_cache_level level,
bool valid, u32 unused)
{
gen6_gtt_pte_t pte = valid ? GEN6_PTE_VALID : 0;
pte |= HSW_PTE_ADDR_ENCODE(addr);
switch (level) {
case I915_CACHE_NONE:
break;
case I915_CACHE_WT:
pte |= HSW_WT_ELLC_LLC_AGE3;
break;
default:
pte |= HSW_WB_ELLC_LLC_AGE3;
break;
}
return pte;
}
/* Broadwell Page Directory Pointer Descriptors */
static int gen8_write_pdp(struct intel_engine_cs *ring, unsigned entry,
uint64_t val, bool synchronous)
{
struct drm_i915_private *dev_priv = ring->dev->dev_private;
int ret;
BUG_ON(entry >= 4);
if (synchronous) {
I915_WRITE(GEN8_RING_PDP_UDW(ring, entry), val >> 32);
I915_WRITE(GEN8_RING_PDP_LDW(ring, entry), (u32)val);
return 0;
}
ret = intel_ring_begin(ring, 6);
if (ret)
return ret;
intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
intel_ring_emit(ring, GEN8_RING_PDP_UDW(ring, entry));
intel_ring_emit(ring, (u32)(val >> 32));
intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
intel_ring_emit(ring, GEN8_RING_PDP_LDW(ring, entry));
intel_ring_emit(ring, (u32)(val));
intel_ring_advance(ring);
return 0;
}
static int gen8_mm_switch(struct i915_hw_ppgtt *ppgtt,
struct intel_engine_cs *ring,
bool synchronous)
{
int i, ret;
/* bit of a hack to find the actual last used pd */
int used_pd = ppgtt->num_pd_entries / GEN8_PDES_PER_PAGE;
for (i = used_pd - 1; i >= 0; i--) {
dma_addr_t addr = ppgtt->pd_dma_addr[i];
ret = gen8_write_pdp(ring, i, addr, synchronous);
if (ret)
return ret;
}
return 0;
}
static void gen8_ppgtt_clear_range(struct i915_address_space *vm,
uint64_t start,
uint64_t length,
bool use_scratch)
{
struct i915_hw_ppgtt *ppgtt =
container_of(vm, struct i915_hw_ppgtt, base);
gen8_gtt_pte_t *pt_vaddr, scratch_pte;
unsigned pdpe = start >> GEN8_PDPE_SHIFT & GEN8_PDPE_MASK;
unsigned pde = start >> GEN8_PDE_SHIFT & GEN8_PDE_MASK;
unsigned pte = start >> GEN8_PTE_SHIFT & GEN8_PTE_MASK;
unsigned num_entries = length >> PAGE_SHIFT;
unsigned last_pte, i;
pt_vaddr = (gen8_gtt_pte_t*)AllocKernelSpace(4096);
if(pt_vaddr == NULL)
return;
scratch_pte = gen8_pte_encode(ppgtt->base.scratch.addr,
I915_CACHE_LLC, use_scratch);
while (num_entries) {
struct page *page_table = ppgtt->gen8_pt_pages[pdpe][pde];
last_pte = pte + num_entries;
if (last_pte > GEN8_PTES_PER_PAGE)
last_pte = GEN8_PTES_PER_PAGE;
MapPage(pt_vaddr,(addr_t)page_table, PG_SW);
for (i = pte; i < last_pte; i++) {
pt_vaddr[i] = scratch_pte;
num_entries--;
}
if (!HAS_LLC(ppgtt->base.dev))
drm_clflush_virt_range(pt_vaddr, PAGE_SIZE);
pte = 0;
if (++pde == GEN8_PDES_PER_PAGE) {
pdpe++;
pde = 0;
}
}
FreeKernelSpace(pt_vaddr);
}
static void gen8_ppgtt_insert_entries(struct i915_address_space *vm,
struct sg_table *pages,
uint64_t start,
enum i915_cache_level cache_level, u32 unused)
{
struct i915_hw_ppgtt *ppgtt =
container_of(vm, struct i915_hw_ppgtt, base);
gen8_gtt_pte_t *pt_vaddr;
unsigned pdpe = start >> GEN8_PDPE_SHIFT & GEN8_PDPE_MASK;
unsigned pde = start >> GEN8_PDE_SHIFT & GEN8_PDE_MASK;
unsigned pte = start >> GEN8_PTE_SHIFT & GEN8_PTE_MASK;
struct sg_page_iter sg_iter;
pt_vaddr = AllocKernelSpace(4096);
if(pt_vaddr == NULL)
return;
MapPage(pt_vaddr,(addr_t)(ppgtt->gen8_pt_pages[pdpe][pde]), 3);
for_each_sg_page(pages->sgl, &sg_iter, pages->nents, 0) {
if (WARN_ON(pdpe >= GEN8_LEGACY_PDPS))
break;
pt_vaddr[pte] =
gen8_pte_encode(sg_page_iter_dma_address(&sg_iter),
cache_level, true);
if (++pte == GEN8_PTES_PER_PAGE) {
if (!HAS_LLC(ppgtt->base.dev))
drm_clflush_virt_range(pt_vaddr, PAGE_SIZE);
if (++pde == GEN8_PDES_PER_PAGE) {
pdpe++;
pde = 0;
}
pte = 0;
MapPage(pt_vaddr,(addr_t)(ppgtt->gen8_pt_pages[pdpe][pde]), 3);
}
}
FreeKernelSpace(pt_vaddr);
}
static void gen8_free_page_tables(struct page **pt_pages)
{
int i;
if (pt_pages == NULL)
return;
// for (i = 0; i < GEN8_PDES_PER_PAGE; i++)
// if (pt_pages[i])
// __free_pages(pt_pages[i], 0);
}
static void gen8_ppgtt_free(const struct i915_hw_ppgtt *ppgtt)
{
int i;
for (i = 0; i < ppgtt->num_pd_pages; i++) {
gen8_free_page_tables(ppgtt->gen8_pt_pages[i]);
kfree(ppgtt->gen8_pt_pages[i]);
kfree(ppgtt->gen8_pt_dma_addr[i]);
}
// __free_pages(ppgtt->pd_pages, get_order(ppgtt->num_pd_pages << PAGE_SHIFT));
}
static void gen8_ppgtt_unmap_pages(struct i915_hw_ppgtt *ppgtt)
{
struct pci_dev *hwdev = ppgtt->base.dev->pdev;
int i, j;
for (i = 0; i < ppgtt->num_pd_pages; i++) {
/* TODO: In the future we'll support sparse mappings, so this
* will have to change. */
if (!ppgtt->pd_dma_addr[i])
continue;
pci_unmap_page(hwdev, ppgtt->pd_dma_addr[i], PAGE_SIZE,
PCI_DMA_BIDIRECTIONAL);
for (j = 0; j < GEN8_PDES_PER_PAGE; j++) {
dma_addr_t addr = ppgtt->gen8_pt_dma_addr[i][j];
if (addr)
pci_unmap_page(hwdev, addr, PAGE_SIZE,
PCI_DMA_BIDIRECTIONAL);
}
}
}
static void gen8_ppgtt_cleanup(struct i915_address_space *vm)
{
struct i915_hw_ppgtt *ppgtt =
container_of(vm, struct i915_hw_ppgtt, base);
list_del(&vm->global_link);
drm_mm_takedown(&vm->mm);
gen8_ppgtt_unmap_pages(ppgtt);
gen8_ppgtt_free(ppgtt);
}
static struct page **__gen8_alloc_page_tables(void)
{
struct page **pt_pages;
int i;
pt_pages = kcalloc(GEN8_PDES_PER_PAGE, sizeof(struct page *), GFP_KERNEL);
if (!pt_pages)
return ERR_PTR(-ENOMEM);
for (i = 0; i < GEN8_PDES_PER_PAGE; i++) {
pt_pages[i] = alloc_page(GFP_KERNEL);
if (!pt_pages[i])
goto bail;
}
return pt_pages;
bail:
gen8_free_page_tables(pt_pages);
kfree(pt_pages);
return ERR_PTR(-ENOMEM);
}
static int gen8_ppgtt_allocate_page_tables(struct i915_hw_ppgtt *ppgtt,
const int max_pdp)
{
struct page **pt_pages[GEN8_LEGACY_PDPS];
int i, ret;
for (i = 0; i < max_pdp; i++) {
pt_pages[i] = __gen8_alloc_page_tables();
if (IS_ERR(pt_pages[i])) {
ret = PTR_ERR(pt_pages[i]);
goto unwind_out;
}
}
/* NB: Avoid touching gen8_pt_pages until last to keep the allocation,
* "atomic" - for cleanup purposes.
*/
for (i = 0; i < max_pdp; i++)
ppgtt->gen8_pt_pages[i] = pt_pages[i];
return 0;
unwind_out:
while (i--) {
gen8_free_page_tables(pt_pages[i]);
kfree(pt_pages[i]);
}
return ret;
}
static int gen8_ppgtt_allocate_dma(struct i915_hw_ppgtt *ppgtt)
{
int i;
for (i = 0; i < ppgtt->num_pd_pages; i++) {
ppgtt->gen8_pt_dma_addr[i] = kcalloc(GEN8_PDES_PER_PAGE,
sizeof(dma_addr_t),
GFP_KERNEL);
if (!ppgtt->gen8_pt_dma_addr[i])
return -ENOMEM;
}
return 0;
}
static int gen8_ppgtt_allocate_page_directories(struct i915_hw_ppgtt *ppgtt,
const int max_pdp)
{
// ppgtt->pd_pages = alloc_pages(GFP_KERNEL, get_order(max_pdp << PAGE_SHIFT));
if (!ppgtt->pd_pages)
return -ENOMEM;
// ppgtt->num_pd_pages = 1 << get_order(max_pdp << PAGE_SHIFT);
BUG_ON(ppgtt->num_pd_pages > GEN8_LEGACY_PDPS);
return 0;
}
static int gen8_ppgtt_alloc(struct i915_hw_ppgtt *ppgtt,
const int max_pdp)
{
int ret;
ret = gen8_ppgtt_allocate_page_directories(ppgtt, max_pdp);
if (ret)
return ret;
ret = gen8_ppgtt_allocate_page_tables(ppgtt, max_pdp);
if (ret) {
// __free_pages(ppgtt->pd_pages, get_order(max_pdp << PAGE_SHIFT));
return ret;
}
ppgtt->num_pd_entries = max_pdp * GEN8_PDES_PER_PAGE;
ret = gen8_ppgtt_allocate_dma(ppgtt);
if (ret)
gen8_ppgtt_free(ppgtt);
return ret;
}
static int gen8_ppgtt_setup_page_directories(struct i915_hw_ppgtt *ppgtt,
const int pd)
{
dma_addr_t pd_addr;
int ret;
pd_addr = pci_map_page(ppgtt->base.dev->pdev,
&ppgtt->pd_pages[pd], 0,
PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
// ret = pci_dma_mapping_error(ppgtt->base.dev->pdev, pd_addr);
// if (ret)
// return ret;
ppgtt->pd_dma_addr[pd] = pd_addr;
return 0;
}
static int gen8_ppgtt_setup_page_tables(struct i915_hw_ppgtt *ppgtt,
const int pd,
const int pt)
{
dma_addr_t pt_addr;
struct page *p;
int ret;
p = ppgtt->gen8_pt_pages[pd][pt];
pt_addr = pci_map_page(ppgtt->base.dev->pdev,
p, 0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
// ret = pci_dma_mapping_error(ppgtt->base.dev->pdev, pt_addr);
// if (ret)
// return ret;
ppgtt->gen8_pt_dma_addr[pd][pt] = pt_addr;
return 0;
}
/**
* GEN8 legacy ppgtt programming is accomplished through a max 4 PDP registers
* with a net effect resembling a 2-level page table in normal x86 terms. Each
* PDP represents 1GB of memory 4 * 512 * 512 * 4096 = 4GB legacy 32b address
* space.
*
* FIXME: split allocation into smaller pieces. For now we only ever do this
* once, but with full PPGTT, the multiple contiguous allocations will be bad.
* TODO: Do something with the size parameter
*/
static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt, uint64_t size)
{
const int max_pdp = DIV_ROUND_UP(size, 1 << 30);
const int min_pt_pages = GEN8_PDES_PER_PAGE * max_pdp;
int i, j, ret;
gen8_ppgtt_pde_t *pd_vaddr;
if (size % (1<<30))
DRM_INFO("Pages will be wasted unless GTT size (%llu) is divisible by 1GB\n", size);
/* 1. Do all our allocations for page directories and page tables. */
ret = gen8_ppgtt_alloc(ppgtt, max_pdp);
if (ret)
return ret;
/*
* 2. Create DMA mappings for the page directories and page tables.
*/
for (i = 0; i < max_pdp; i++) {
ret = gen8_ppgtt_setup_page_directories(ppgtt, i);
if (ret)
goto bail;
for (j = 0; j < GEN8_PDES_PER_PAGE; j++) {
ret = gen8_ppgtt_setup_page_tables(ppgtt, i, j);
if (ret)
goto bail;
}
}
/*
* 3. Map all the page directory entires to point to the page tables
* we've allocated.
*
* For now, the PPGTT helper functions all require that the PDEs are
* plugged in correctly. So we do that now/here. For aliasing PPGTT, we
* will never need to touch the PDEs again.
*/
pd_vaddr = AllocKernelSpace(4096);
for (i = 0; i < max_pdp; i++) {
MapPage(pd_vaddr,(addr_t)(&ppgtt->pd_pages[i]), 3);
for (j = 0; j < GEN8_PDES_PER_PAGE; j++) {
dma_addr_t addr = ppgtt->gen8_pt_dma_addr[i][j];
pd_vaddr[j] = gen8_pde_encode(ppgtt->base.dev, addr,
I915_CACHE_LLC);
}
if (!HAS_LLC(ppgtt->base.dev))
drm_clflush_virt_range(pd_vaddr, PAGE_SIZE);
}
FreeKernelSpace(pd_vaddr);
ppgtt->enable = gen8_ppgtt_enable;
ppgtt->switch_mm = gen8_mm_switch;
ppgtt->base.clear_range = gen8_ppgtt_clear_range;
ppgtt->base.insert_entries = gen8_ppgtt_insert_entries;
ppgtt->base.cleanup = gen8_ppgtt_cleanup;
ppgtt->base.start = 0;
ppgtt->base.total = ppgtt->num_pd_entries * GEN8_PTES_PER_PAGE * PAGE_SIZE;
ppgtt->base.clear_range(&ppgtt->base, 0, ppgtt->base.total, true);
DRM_DEBUG_DRIVER("Allocated %d pages for page directories (%d wasted)\n",
ppgtt->num_pd_pages, ppgtt->num_pd_pages - max_pdp);
DRM_DEBUG_DRIVER("Allocated %d pages for page tables (%lld wasted)\n",
ppgtt->num_pd_entries,
(ppgtt->num_pd_entries - min_pt_pages) + size % (1<<30));
return 0;
bail:
gen8_ppgtt_unmap_pages(ppgtt);
gen8_ppgtt_free(ppgtt);
return ret;
}
static void gen6_write_pdes(struct i915_hw_ppgtt *ppgtt)
{
struct drm_i915_private *dev_priv = ppgtt->base.dev->dev_private;
gen6_gtt_pte_t __iomem *pd_addr;
uint32_t pd_entry;
int i;
WARN_ON(ppgtt->pd_offset & 0x3f);
pd_addr = (gen6_gtt_pte_t __iomem*)dev_priv->gtt.gsm +
ppgtt->pd_offset / sizeof(gen6_gtt_pte_t);
for (i = 0; i < ppgtt->num_pd_entries; i++) {
dma_addr_t pt_addr;
pt_addr = ppgtt->pt_dma_addr[i];
pd_entry = GEN6_PDE_ADDR_ENCODE(pt_addr);
pd_entry |= GEN6_PDE_VALID;
writel(pd_entry, pd_addr + i);
}
readl(pd_addr);
}
static uint32_t get_pd_offset(struct i915_hw_ppgtt *ppgtt)
{
BUG_ON(ppgtt->pd_offset & 0x3f);
return (ppgtt->pd_offset / 64) << 16;
}
static int hsw_mm_switch(struct i915_hw_ppgtt *ppgtt,
struct intel_engine_cs *ring,
bool synchronous)
{
struct drm_device *dev = ppgtt->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
int ret;
/* If we're in reset, we can assume the GPU is sufficiently idle to
* manually frob these bits. Ideally we could use the ring functions,
* except our error handling makes it quite difficult (can't use
* intel_ring_begin, ring->flush, or intel_ring_advance)
*
* FIXME: We should try not to special case reset
*/
if (synchronous ||
i915_reset_in_progress(&dev_priv->gpu_error)) {
WARN_ON(ppgtt != dev_priv->mm.aliasing_ppgtt);
I915_WRITE(RING_PP_DIR_DCLV(ring), PP_DIR_DCLV_2G);
I915_WRITE(RING_PP_DIR_BASE(ring), get_pd_offset(ppgtt));
POSTING_READ(RING_PP_DIR_BASE(ring));
return 0;
}
/* NB: TLBs must be flushed and invalidated before a switch */
ret = ring->flush(ring, I915_GEM_GPU_DOMAINS, I915_GEM_GPU_DOMAINS);
if (ret)
return ret;
ret = intel_ring_begin(ring, 6);
if (ret)
return ret;
intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(2));
intel_ring_emit(ring, RING_PP_DIR_DCLV(ring));
intel_ring_emit(ring, PP_DIR_DCLV_2G);
intel_ring_emit(ring, RING_PP_DIR_BASE(ring));
intel_ring_emit(ring, get_pd_offset(ppgtt));
intel_ring_emit(ring, MI_NOOP);
intel_ring_advance(ring);
return 0;
}
static int gen7_mm_switch(struct i915_hw_ppgtt *ppgtt,
struct intel_engine_cs *ring,
bool synchronous)
{
struct drm_device *dev = ppgtt->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
int ret;
/* If we're in reset, we can assume the GPU is sufficiently idle to
* manually frob these bits. Ideally we could use the ring functions,
* except our error handling makes it quite difficult (can't use
* intel_ring_begin, ring->flush, or intel_ring_advance)
*
* FIXME: We should try not to special case reset
*/
if (synchronous ||
i915_reset_in_progress(&dev_priv->gpu_error)) {
WARN_ON(ppgtt != dev_priv->mm.aliasing_ppgtt);
I915_WRITE(RING_PP_DIR_DCLV(ring), PP_DIR_DCLV_2G);
I915_WRITE(RING_PP_DIR_BASE(ring), get_pd_offset(ppgtt));
POSTING_READ(RING_PP_DIR_BASE(ring));
return 0;
}
/* NB: TLBs must be flushed and invalidated before a switch */
ret = ring->flush(ring, I915_GEM_GPU_DOMAINS, I915_GEM_GPU_DOMAINS);
if (ret)
return ret;
ret = intel_ring_begin(ring, 6);
if (ret)
return ret;
intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(2));
intel_ring_emit(ring, RING_PP_DIR_DCLV(ring));
intel_ring_emit(ring, PP_DIR_DCLV_2G);
intel_ring_emit(ring, RING_PP_DIR_BASE(ring));
intel_ring_emit(ring, get_pd_offset(ppgtt));
intel_ring_emit(ring, MI_NOOP);
intel_ring_advance(ring);
/* XXX: RCS is the only one to auto invalidate the TLBs? */
if (ring->id != RCS) {
ret = ring->flush(ring, I915_GEM_GPU_DOMAINS, I915_GEM_GPU_DOMAINS);
if (ret)
return ret;
}
return 0;
}
static int gen6_mm_switch(struct i915_hw_ppgtt *ppgtt,
struct intel_engine_cs *ring,
bool synchronous)
{
struct drm_device *dev = ppgtt->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
if (!synchronous)
return 0;
I915_WRITE(RING_PP_DIR_DCLV(ring), PP_DIR_DCLV_2G);
I915_WRITE(RING_PP_DIR_BASE(ring), get_pd_offset(ppgtt));
POSTING_READ(RING_PP_DIR_DCLV(ring));
return 0;
}
static int gen8_ppgtt_enable(struct i915_hw_ppgtt *ppgtt)
{
struct drm_device *dev = ppgtt->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_engine_cs *ring;
int j, ret;
for_each_ring(ring, dev_priv, j) {
I915_WRITE(RING_MODE_GEN7(ring),
_MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE));
/* We promise to do a switch later with FULL PPGTT. If this is
* aliasing, this is the one and only switch we'll do */
if (USES_FULL_PPGTT(dev))
continue;
ret = ppgtt->switch_mm(ppgtt, ring, true);
if (ret)
goto err_out;
}
return 0;
err_out:
for_each_ring(ring, dev_priv, j)
I915_WRITE(RING_MODE_GEN7(ring),
_MASKED_BIT_DISABLE(GFX_PPGTT_ENABLE));
return ret;
}
static int gen7_ppgtt_enable(struct i915_hw_ppgtt *ppgtt)
{
struct drm_device *dev = ppgtt->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_engine_cs *ring;
uint32_t ecochk, ecobits;
int i;
ecobits = I915_READ(GAC_ECO_BITS);
I915_WRITE(GAC_ECO_BITS, ecobits | ECOBITS_PPGTT_CACHE64B);
ecochk = I915_READ(GAM_ECOCHK);
if (IS_HASWELL(dev)) {
ecochk |= ECOCHK_PPGTT_WB_HSW;
} else {
ecochk |= ECOCHK_PPGTT_LLC_IVB;
ecochk &= ~ECOCHK_PPGTT_GFDT_IVB;
}
I915_WRITE(GAM_ECOCHK, ecochk);
for_each_ring(ring, dev_priv, i) {
int ret;
/* GFX_MODE is per-ring on gen7+ */
I915_WRITE(RING_MODE_GEN7(ring),
_MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE));
/* We promise to do a switch later with FULL PPGTT. If this is
* aliasing, this is the one and only switch we'll do */
if (USES_FULL_PPGTT(dev))
continue;
ret = ppgtt->switch_mm(ppgtt, ring, true);
if (ret)
return ret;
}
return 0;
}
static int gen6_ppgtt_enable(struct i915_hw_ppgtt *ppgtt)
{
struct drm_device *dev = ppgtt->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_engine_cs *ring;
uint32_t ecochk, gab_ctl, ecobits;
int i;
ecobits = I915_READ(GAC_ECO_BITS);
I915_WRITE(GAC_ECO_BITS, ecobits | ECOBITS_SNB_BIT |
ECOBITS_PPGTT_CACHE64B);
gab_ctl = I915_READ(GAB_CTL);
I915_WRITE(GAB_CTL, gab_ctl | GAB_CTL_CONT_AFTER_PAGEFAULT);
ecochk = I915_READ(GAM_ECOCHK);
I915_WRITE(GAM_ECOCHK, ecochk | ECOCHK_SNB_BIT | ECOCHK_PPGTT_CACHE64B);
I915_WRITE(GFX_MODE, _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE));
for_each_ring(ring, dev_priv, i) {
int ret = ppgtt->switch_mm(ppgtt, ring, true);
if (ret)
return ret;
}
return 0;
}
/* PPGTT support for Sandybdrige/Gen6 and later */
static void gen6_ppgtt_clear_range(struct i915_address_space *vm,
uint64_t start,
uint64_t length,
bool use_scratch)
{
struct i915_hw_ppgtt *ppgtt =
container_of(vm, struct i915_hw_ppgtt, base);
gen6_gtt_pte_t *pt_vaddr, scratch_pte;
unsigned first_entry = start >> PAGE_SHIFT;
unsigned num_entries = length >> PAGE_SHIFT;
unsigned act_pt = first_entry / I915_PPGTT_PT_ENTRIES;
unsigned first_pte = first_entry % I915_PPGTT_PT_ENTRIES;
unsigned last_pte, i;
scratch_pte = vm->pte_encode(vm->scratch.addr, I915_CACHE_LLC, true, 0);
pt_vaddr = AllocKernelSpace(4096);
if(pt_vaddr == NULL)
return;
while (num_entries) {
last_pte = first_pte + num_entries;
if (last_pte > I915_PPGTT_PT_ENTRIES)
last_pte = I915_PPGTT_PT_ENTRIES;
MapPage(pt_vaddr,(addr_t)(ppgtt->pt_pages[act_pt]), 3);
for (i = first_pte; i < last_pte; i++)
pt_vaddr[i] = scratch_pte;
num_entries -= last_pte - first_pte;
first_pte = 0;
act_pt++;
};
FreeKernelSpace(pt_vaddr);
}
static void gen6_ppgtt_insert_entries(struct i915_address_space *vm,
struct sg_table *pages,
uint64_t start,
enum i915_cache_level cache_level, u32 flags)
{
struct i915_hw_ppgtt *ppgtt =
container_of(vm, struct i915_hw_ppgtt, base);
gen6_gtt_pte_t *pt_vaddr;
unsigned first_entry = start >> PAGE_SHIFT;
unsigned act_pt = first_entry / I915_PPGTT_PT_ENTRIES;
unsigned act_pte = first_entry % I915_PPGTT_PT_ENTRIES;
struct sg_page_iter sg_iter;
pt_vaddr = AllocKernelSpace(4096);
if(pt_vaddr == NULL)
return;
MapPage(pt_vaddr,(addr_t)(ppgtt->pt_pages[act_pt]), 3);
for_each_sg_page(pages->sgl, &sg_iter, pages->nents, 0) {
pt_vaddr[act_pte] =
vm->pte_encode(sg_page_iter_dma_address(&sg_iter),
cache_level, true, flags);
if (++act_pte == I915_PPGTT_PT_ENTRIES) {
act_pt++;
MapPage(pt_vaddr,(addr_t)(ppgtt->pt_pages[act_pt]), 3);
act_pte = 0;
}
}
FreeKernelSpace(pt_vaddr);
}
static void gen6_ppgtt_unmap_pages(struct i915_hw_ppgtt *ppgtt)
{
int i;
if (ppgtt->pt_dma_addr) {
for (i = 0; i < ppgtt->num_pd_entries; i++)
pci_unmap_page(ppgtt->base.dev->pdev,
ppgtt->pt_dma_addr[i],
4096, PCI_DMA_BIDIRECTIONAL);
}
}
static void gen6_ppgtt_free(struct i915_hw_ppgtt *ppgtt)
{
int i;
kfree(ppgtt->pt_dma_addr);
for (i = 0; i < ppgtt->num_pd_entries; i++)
__free_page(ppgtt->pt_pages[i]);
kfree(ppgtt->pt_pages);
}
static void gen6_ppgtt_cleanup(struct i915_address_space *vm)
{
struct i915_hw_ppgtt *ppgtt =
container_of(vm, struct i915_hw_ppgtt, base);
list_del(&vm->global_link);
drm_mm_takedown(&ppgtt->base.mm);
drm_mm_remove_node(&ppgtt->node);
gen6_ppgtt_unmap_pages(ppgtt);
gen6_ppgtt_free(ppgtt);
}
static int gen6_ppgtt_allocate_page_directories(struct i915_hw_ppgtt *ppgtt)
{
struct drm_device *dev = ppgtt->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
bool retried = false;
int ret;
/* PPGTT PDEs reside in the GGTT and consists of 512 entries. The
* allocator works in address space sizes, so it's multiplied by page
* size. We allocate at the top of the GTT to avoid fragmentation.
*/
BUG_ON(!drm_mm_initialized(&dev_priv->gtt.base.mm));
alloc:
ret = drm_mm_insert_node_in_range_generic(&dev_priv->gtt.base.mm,
&ppgtt->node, GEN6_PD_SIZE,
GEN6_PD_ALIGN, 0,
0, dev_priv->gtt.base.total,
DRM_MM_TOPDOWN);
if (ret == -ENOSPC && !retried) {
ret = i915_gem_evict_something(dev, &dev_priv->gtt.base,
GEN6_PD_SIZE, GEN6_PD_ALIGN,
I915_CACHE_NONE,
0, dev_priv->gtt.base.total,
0);
if (ret)
return ret;
retried = true;
goto alloc;
}
if (ppgtt->node.start < dev_priv->gtt.mappable_end)
DRM_DEBUG("Forced to use aperture for PDEs\n");
ppgtt->num_pd_entries = GEN6_PPGTT_PD_ENTRIES;
return ret;
}
static int gen6_ppgtt_allocate_page_tables(struct i915_hw_ppgtt *ppgtt)
{
int i;
ppgtt->pt_pages = kcalloc(ppgtt->num_pd_entries, sizeof(struct page *),
GFP_KERNEL);
if (!ppgtt->pt_pages)
return -ENOMEM;
for (i = 0; i < ppgtt->num_pd_entries; i++) {
ppgtt->pt_pages[i] = alloc_page(GFP_KERNEL);
if (!ppgtt->pt_pages[i]) {
gen6_ppgtt_free(ppgtt);
return -ENOMEM;
}
}
return 0;
}
static int gen6_ppgtt_alloc(struct i915_hw_ppgtt *ppgtt)
{
int ret;
ret = gen6_ppgtt_allocate_page_directories(ppgtt);
if (ret)
return ret;
ret = gen6_ppgtt_allocate_page_tables(ppgtt);
if (ret) {
drm_mm_remove_node(&ppgtt->node);
return ret;
}
ppgtt->pt_dma_addr = kcalloc(ppgtt->num_pd_entries, sizeof(dma_addr_t),
GFP_KERNEL);
if (!ppgtt->pt_dma_addr) {
drm_mm_remove_node(&ppgtt->node);
gen6_ppgtt_free(ppgtt);
return -ENOMEM;
}
return 0;
}
static int gen6_ppgtt_setup_page_tables(struct i915_hw_ppgtt *ppgtt)
{
struct drm_device *dev = ppgtt->base.dev;
int i;
for (i = 0; i < ppgtt->num_pd_entries; i++) {
dma_addr_t pt_addr;
pt_addr = pci_map_page(dev->pdev, ppgtt->pt_pages[i], 0, 4096,
PCI_DMA_BIDIRECTIONAL);
// if (pci_dma_mapping_error(dev->pdev, pt_addr)) {
// gen6_ppgtt_unmap_pages(ppgtt);
// return -EIO;
// }
ppgtt->pt_dma_addr[i] = pt_addr;
}
return 0;
}
static int gen6_ppgtt_init(struct i915_hw_ppgtt *ppgtt)
{
struct drm_device *dev = ppgtt->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
int ret;
ppgtt->base.pte_encode = dev_priv->gtt.base.pte_encode;
if (IS_GEN6(dev)) {
ppgtt->enable = gen6_ppgtt_enable;
ppgtt->switch_mm = gen6_mm_switch;
} else if (IS_HASWELL(dev)) {
ppgtt->enable = gen7_ppgtt_enable;
ppgtt->switch_mm = hsw_mm_switch;
} else if (IS_GEN7(dev)) {
ppgtt->enable = gen7_ppgtt_enable;
ppgtt->switch_mm = gen7_mm_switch;
} else
BUG();
ret = gen6_ppgtt_alloc(ppgtt);
if (ret)
return ret;
ret = gen6_ppgtt_setup_page_tables(ppgtt);
if (ret) {
gen6_ppgtt_free(ppgtt);
return ret;
}
ppgtt->base.clear_range = gen6_ppgtt_clear_range;
ppgtt->base.insert_entries = gen6_ppgtt_insert_entries;
ppgtt->base.cleanup = gen6_ppgtt_cleanup;
ppgtt->base.start = 0;
ppgtt->base.total = ppgtt->num_pd_entries * I915_PPGTT_PT_ENTRIES * PAGE_SIZE;
// ppgtt->debug_dump = gen6_dump_ppgtt;
ppgtt->pd_offset =
ppgtt->node.start / PAGE_SIZE * sizeof(gen6_gtt_pte_t);
ppgtt->base.clear_range(&ppgtt->base, 0, ppgtt->base.total, true);
DRM_DEBUG_DRIVER("Allocated pde space (%ldM) at GTT entry: %lx\n",
ppgtt->node.size >> 20,
ppgtt->node.start / PAGE_SIZE);
return 0;
}
int i915_gem_init_ppgtt(struct drm_device *dev, struct i915_hw_ppgtt *ppgtt)
{
struct drm_i915_private *dev_priv = dev->dev_private;
int ret = 0;
ppgtt->base.dev = dev;
ppgtt->base.scratch = dev_priv->gtt.base.scratch;
if (INTEL_INFO(dev)->gen < 8)
ret = gen6_ppgtt_init(ppgtt);
else if (IS_GEN8(dev))
ret = gen8_ppgtt_init(ppgtt, dev_priv->gtt.base.total);
else
BUG();
if (!ret) {
struct drm_i915_private *dev_priv = dev->dev_private;
kref_init(&ppgtt->ref);
drm_mm_init(&ppgtt->base.mm, ppgtt->base.start,
ppgtt->base.total);
i915_init_vm(dev_priv, &ppgtt->base);
if (INTEL_INFO(dev)->gen < 8) {
gen6_write_pdes(ppgtt);
DRM_DEBUG("Adding PPGTT at offset %x\n",
ppgtt->pd_offset << 10);
}
}
return ret;
}
static void
ppgtt_bind_vma(struct i915_vma *vma,
enum i915_cache_level cache_level,
u32 flags)
{
/* Currently applicable only to VLV */
if (vma->obj->gt_ro)
flags |= PTE_READ_ONLY;
vma->vm->insert_entries(vma->vm, vma->obj->pages, vma->node.start,
cache_level, flags);
}
static void ppgtt_unbind_vma(struct i915_vma *vma)
{
vma->vm->clear_range(vma->vm,
vma->node.start,
vma->obj->base.size,
true);
}
extern int intel_iommu_gfx_mapped;
/* Certain Gen5 chipsets require require idling the GPU before
* unmapping anything from the GTT when VT-d is enabled.
*/
static inline bool needs_idle_maps(struct drm_device *dev)
{
#ifdef CONFIG_INTEL_IOMMU
/* Query intel_iommu to see if we need the workaround. Presumably that
* was loaded first.
*/
if (IS_GEN5(dev) && IS_MOBILE(dev) && intel_iommu_gfx_mapped)
return true;
#endif
return false;
}
static bool do_idling(struct drm_i915_private *dev_priv)
{
bool ret = dev_priv->mm.interruptible;
if (unlikely(dev_priv->gtt.do_idle_maps)) {
dev_priv->mm.interruptible = false;
if (i915_gpu_idle(dev_priv->dev)) {
DRM_ERROR("Couldn't idle GPU\n");
/* Wait a bit, in hopes it avoids the hang */
udelay(10);
}
}
return ret;
}
static void undo_idling(struct drm_i915_private *dev_priv, bool interruptible)
{
if (unlikely(dev_priv->gtt.do_idle_maps))
dev_priv->mm.interruptible = interruptible;
}
void i915_check_and_clear_faults(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_engine_cs *ring;
int i;
if (INTEL_INFO(dev)->gen < 6)
return;
for_each_ring(ring, dev_priv, i) {
u32 fault_reg;
fault_reg = I915_READ(RING_FAULT_REG(ring));
if (fault_reg & RING_FAULT_VALID) {
DRM_DEBUG_DRIVER("Unexpected fault\n"
"\tAddr: 0x%08lx\\n"
"\tAddress space: %s\n"
"\tSource ID: %d\n"
"\tType: %d\n",
fault_reg & PAGE_MASK,
fault_reg & RING_FAULT_GTTSEL_MASK ? "GGTT" : "PPGTT",
RING_FAULT_SRCID(fault_reg),
RING_FAULT_FAULT_TYPE(fault_reg));
I915_WRITE(RING_FAULT_REG(ring),
fault_reg & ~RING_FAULT_VALID);
}
}
POSTING_READ(RING_FAULT_REG(&dev_priv->ring[RCS]));
}
void i915_gem_suspend_gtt_mappings(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
/* Don't bother messing with faults pre GEN6 as we have little
* documentation supporting that it's a good idea.
*/
if (INTEL_INFO(dev)->gen < 6)
return;
i915_check_and_clear_faults(dev);
dev_priv->gtt.base.clear_range(&dev_priv->gtt.base,
dev_priv->gtt.base.start,
dev_priv->gtt.base.total,
true);
}
void i915_gem_restore_gtt_mappings(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_i915_gem_object *obj;
struct i915_address_space *vm;
i915_check_and_clear_faults(dev);
/* First fill our portion of the GTT with scratch pages */
dev_priv->gtt.base.clear_range(&dev_priv->gtt.base,
dev_priv->gtt.base.start,
dev_priv->gtt.base.total,
true);
list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list) {
struct i915_vma *vma = i915_gem_obj_to_vma(obj,
&dev_priv->gtt.base);
if (!vma)
continue;
i915_gem_clflush_object(obj, obj->pin_display);
/* The bind_vma code tries to be smart about tracking mappings.
* Unfortunately above, we've just wiped out the mappings
* without telling our object about it. So we need to fake it.
*/
obj->has_global_gtt_mapping = 0;
vma->bind_vma(vma, obj->cache_level, GLOBAL_BIND);
}
if (INTEL_INFO(dev)->gen >= 8) {
if (IS_CHERRYVIEW(dev))
chv_setup_private_ppat(dev_priv);
else
bdw_setup_private_ppat(dev_priv);
return;
}
list_for_each_entry(vm, &dev_priv->vm_list, global_link) {
/* TODO: Perhaps it shouldn't be gen6 specific */
if (i915_is_ggtt(vm)) {
if (dev_priv->mm.aliasing_ppgtt)
gen6_write_pdes(dev_priv->mm.aliasing_ppgtt);
continue;
}
gen6_write_pdes(container_of(vm, struct i915_hw_ppgtt, base));
}
i915_gem_chipset_flush(dev);
}
int i915_gem_gtt_prepare_object(struct drm_i915_gem_object *obj)
{
if (obj->has_dma_mapping)
return 0;
if (!dma_map_sg(&obj->base.dev->pdev->dev,
obj->pages->sgl, obj->pages->nents,
PCI_DMA_BIDIRECTIONAL))
return -ENOSPC;
return 0;
}
static inline void gen8_set_pte(void __iomem *addr, gen8_gtt_pte_t pte)
{
#ifdef writeq
writeq(pte, addr);
#else
iowrite32((u32)pte, addr);
iowrite32(pte >> 32, addr + 4);
#endif
}
static void gen8_ggtt_insert_entries(struct i915_address_space *vm,
struct sg_table *st,
uint64_t start,
enum i915_cache_level level, u32 unused)
{
struct drm_i915_private *dev_priv = vm->dev->dev_private;
unsigned first_entry = start >> PAGE_SHIFT;
gen8_gtt_pte_t __iomem *gtt_entries =
(gen8_gtt_pte_t __iomem *)dev_priv->gtt.gsm + first_entry;
int i = 0;
struct sg_page_iter sg_iter;
dma_addr_t addr = 0; /* shut up gcc */
for_each_sg_page(st->sgl, &sg_iter, st->nents, 0) {
addr = sg_dma_address(sg_iter.sg) +
(sg_iter.sg_pgoffset << PAGE_SHIFT);
gen8_set_pte(&gtt_entries[i],
gen8_pte_encode(addr, level, true));
i++;
}
/*
* XXX: This serves as a posting read to make sure that the PTE has
* actually been updated. There is some concern that even though
* registers and PTEs are within the same BAR that they are potentially
* of NUMA access patterns. Therefore, even with the way we assume
* hardware should work, we must keep this posting read for paranoia.
*/
if (i != 0)
WARN_ON(readq(&gtt_entries[i-1])
!= gen8_pte_encode(addr, level, true));
/* This next bit makes the above posting read even more important. We
* want to flush the TLBs only after we're certain all the PTE updates
* have finished.
*/
I915_WRITE(GFX_FLSH_CNTL_GEN6, GFX_FLSH_CNTL_EN);
POSTING_READ(GFX_FLSH_CNTL_GEN6);
}
/*
* Binds an object into the global gtt with the specified cache level. The object
* will be accessible to the GPU via commands whose operands reference offsets
* within the global GTT as well as accessible by the GPU through the GMADR
* mapped BAR (dev_priv->mm.gtt->gtt).
*/
static void gen6_ggtt_insert_entries(struct i915_address_space *vm,
struct sg_table *st,
uint64_t start,
enum i915_cache_level level, u32 flags)
{
struct drm_i915_private *dev_priv = vm->dev->dev_private;
unsigned first_entry = start >> PAGE_SHIFT;
gen6_gtt_pte_t __iomem *gtt_entries =
(gen6_gtt_pte_t __iomem *)dev_priv->gtt.gsm + first_entry;
int i = 0;
struct sg_page_iter sg_iter;
dma_addr_t addr = 0;
for_each_sg_page(st->sgl, &sg_iter, st->nents, 0) {
addr = sg_page_iter_dma_address(&sg_iter);
iowrite32(vm->pte_encode(addr, level, true, flags), &gtt_entries[i]);
i++;
}
/* XXX: This serves as a posting read to make sure that the PTE has
* actually been updated. There is some concern that even though
* registers and PTEs are within the same BAR that they are potentially
* of NUMA access patterns. Therefore, even with the way we assume
* hardware should work, we must keep this posting read for paranoia.
*/
if (i != 0) {
unsigned long gtt = readl(&gtt_entries[i-1]);
WARN_ON(gtt != vm->pte_encode(addr, level, true, flags));
}
/* This next bit makes the above posting read even more important. We
* want to flush the TLBs only after we're certain all the PTE updates
* have finished.
*/
I915_WRITE(GFX_FLSH_CNTL_GEN6, GFX_FLSH_CNTL_EN);
POSTING_READ(GFX_FLSH_CNTL_GEN6);
}
static void gen8_ggtt_clear_range(struct i915_address_space *vm,
uint64_t start,
uint64_t length,
bool use_scratch)
{
struct drm_i915_private *dev_priv = vm->dev->dev_private;
unsigned first_entry = start >> PAGE_SHIFT;
unsigned num_entries = length >> PAGE_SHIFT;
gen8_gtt_pte_t scratch_pte, __iomem *gtt_base =
(gen8_gtt_pte_t __iomem *) dev_priv->gtt.gsm + first_entry;
const int max_entries = gtt_total_entries(dev_priv->gtt) - first_entry;
int i;
if (WARN(num_entries > max_entries,
"First entry = %d; Num entries = %d (max=%d)\n",
first_entry, num_entries, max_entries))
num_entries = max_entries;
scratch_pte = gen8_pte_encode(vm->scratch.addr,
I915_CACHE_LLC,
use_scratch);
for (i = 0; i < num_entries; i++)
gen8_set_pte(&gtt_base[i], scratch_pte);
readl(gtt_base);
}
static void gen6_ggtt_clear_range(struct i915_address_space *vm,
uint64_t start,
uint64_t length,
bool use_scratch)
{
struct drm_i915_private *dev_priv = vm->dev->dev_private;
unsigned first_entry = start >> PAGE_SHIFT;
unsigned num_entries = length >> PAGE_SHIFT;
gen6_gtt_pte_t scratch_pte, __iomem *gtt_base =
(gen6_gtt_pte_t __iomem *) dev_priv->gtt.gsm + first_entry;
const int max_entries = gtt_total_entries(dev_priv->gtt) - first_entry;
int i;
if (WARN(num_entries > max_entries,
"First entry = %d; Num entries = %d (max=%d)\n",
first_entry, num_entries, max_entries))
num_entries = max_entries;
scratch_pte = vm->pte_encode(vm->scratch.addr, I915_CACHE_LLC, use_scratch, 0);
for (i = 0; i < num_entries; i++)
iowrite32(scratch_pte, &gtt_base[i]);
readl(gtt_base);
}
static void i915_ggtt_bind_vma(struct i915_vma *vma,
enum i915_cache_level cache_level,
u32 unused)
{
const unsigned long entry = vma->node.start >> PAGE_SHIFT;
unsigned int flags = (cache_level == I915_CACHE_NONE) ?
AGP_USER_MEMORY : AGP_USER_CACHED_MEMORY;
BUG_ON(!i915_is_ggtt(vma->vm));
intel_gtt_insert_sg_entries(vma->obj->pages, entry, flags);
vma->obj->has_global_gtt_mapping = 1;
}
static void i915_ggtt_clear_range(struct i915_address_space *vm,
uint64_t start,
uint64_t length,
bool unused)
{
unsigned first_entry = start >> PAGE_SHIFT;
unsigned num_entries = length >> PAGE_SHIFT;
intel_gtt_clear_range(first_entry, num_entries);
}
static void i915_ggtt_unbind_vma(struct i915_vma *vma)
{
const unsigned int first = vma->node.start >> PAGE_SHIFT;
const unsigned int size = vma->obj->base.size >> PAGE_SHIFT;
BUG_ON(!i915_is_ggtt(vma->vm));
vma->obj->has_global_gtt_mapping = 0;
intel_gtt_clear_range(first, size);
}
static void ggtt_bind_vma(struct i915_vma *vma,
enum i915_cache_level cache_level,
u32 flags)
{
struct drm_device *dev = vma->vm->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_i915_gem_object *obj = vma->obj;
/* Currently applicable only to VLV */
if (obj->gt_ro)
flags |= PTE_READ_ONLY;
/* If there is no aliasing PPGTT, or the caller needs a global mapping,
* or we have a global mapping already but the cacheability flags have
* changed, set the global PTEs.
*
* If there is an aliasing PPGTT it is anecdotally faster, so use that
* instead if none of the above hold true.
*
* NB: A global mapping should only be needed for special regions like
* "gtt mappable", SNB errata, or if specified via special execbuf
* flags. At all other times, the GPU will use the aliasing PPGTT.
*/
if (!dev_priv->mm.aliasing_ppgtt || flags & GLOBAL_BIND) {
if (!obj->has_global_gtt_mapping ||
(cache_level != obj->cache_level)) {
vma->vm->insert_entries(vma->vm, obj->pages,
vma->node.start,
cache_level, flags);
obj->has_global_gtt_mapping = 1;
}
}
if (dev_priv->mm.aliasing_ppgtt &&
(!obj->has_aliasing_ppgtt_mapping ||
(cache_level != obj->cache_level))) {
struct i915_hw_ppgtt *appgtt = dev_priv->mm.aliasing_ppgtt;
appgtt->base.insert_entries(&appgtt->base,
vma->obj->pages,
vma->node.start,
cache_level, flags);
vma->obj->has_aliasing_ppgtt_mapping = 1;
}
}
static void ggtt_unbind_vma(struct i915_vma *vma)
{
struct drm_device *dev = vma->vm->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_i915_gem_object *obj = vma->obj;
if (obj->has_global_gtt_mapping) {
vma->vm->clear_range(vma->vm,
vma->node.start,
obj->base.size,
true);
obj->has_global_gtt_mapping = 0;
}
if (obj->has_aliasing_ppgtt_mapping) {
struct i915_hw_ppgtt *appgtt = dev_priv->mm.aliasing_ppgtt;
appgtt->base.clear_range(&appgtt->base,
vma->node.start,
obj->base.size,
true);
obj->has_aliasing_ppgtt_mapping = 0;
}
}
void i915_gem_gtt_finish_object(struct drm_i915_gem_object *obj)
{
struct drm_device *dev = obj->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
bool interruptible;
interruptible = do_idling(dev_priv);
if (!obj->has_dma_mapping)
dma_unmap_sg(&dev->pdev->dev,
obj->pages->sgl, obj->pages->nents,
PCI_DMA_BIDIRECTIONAL);
undo_idling(dev_priv, interruptible);
}
static void i915_gtt_color_adjust(struct drm_mm_node *node,
unsigned long color,
unsigned long *start,
unsigned long *end)
{
if (node->color != color)
*start += 4096;
if (!list_empty(&node->node_list)) {
node = list_entry(node->node_list.next,
struct drm_mm_node,
node_list);
if (node->allocated && node->color != color)
*end -= 4096;
}
}
void i915_gem_setup_global_gtt(struct drm_device *dev,
unsigned long start,
unsigned long mappable_end,
unsigned long end)
{
/* Let GEM Manage all of the aperture.
*
* However, leave one page at the end still bound to the scratch page.
* There are a number of places where the hardware apparently prefetches
* past the end of the object, and we've seen multiple hangs with the
* GPU head pointer stuck in a batchbuffer bound at the last page of the
* aperture. One page should be enough to keep any prefetching inside
* of the aperture.
*/
struct drm_i915_private *dev_priv = dev->dev_private;
struct i915_address_space *ggtt_vm = &dev_priv->gtt.base;
struct drm_mm_node *entry;
struct drm_i915_gem_object *obj;
unsigned long hole_start, hole_end;
BUG_ON(mappable_end > end);
/* Subtract the guard page ... */
drm_mm_init(&ggtt_vm->mm, start, end - start - PAGE_SIZE);
if (!HAS_LLC(dev))
dev_priv->gtt.base.mm.color_adjust = i915_gtt_color_adjust;
/* Mark any preallocated objects as occupied */
list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list) {
struct i915_vma *vma = i915_gem_obj_to_vma(obj, ggtt_vm);
int ret;
DRM_DEBUG_KMS("reserving preallocated space: %lx + %zx\n",
i915_gem_obj_ggtt_offset(obj), obj->base.size);
WARN_ON(i915_gem_obj_ggtt_bound(obj));
ret = drm_mm_reserve_node(&ggtt_vm->mm, &vma->node);
if (ret)
DRM_DEBUG_KMS("Reservation failed\n");
obj->has_global_gtt_mapping = 1;
}
dev_priv->gtt.base.start = start;
dev_priv->gtt.base.total = end - start;
/* Clear any non-preallocated blocks */
drm_mm_for_each_hole(entry, &ggtt_vm->mm, hole_start, hole_end) {
DRM_DEBUG_KMS("clearing unused GTT space: [%lx, %lx]\n",
hole_start, hole_end);
ggtt_vm->clear_range(ggtt_vm, hole_start,
hole_end - hole_start, true);
}
/* And finally clear the reserved guard page */
ggtt_vm->clear_range(ggtt_vm, end - PAGE_SIZE, PAGE_SIZE, true);
}
void i915_gem_init_global_gtt(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
unsigned long gtt_size, mappable_size;
gtt_size = dev_priv->gtt.base.total;
mappable_size = dev_priv->gtt.mappable_end;
i915_gem_setup_global_gtt(dev, 0, mappable_size, gtt_size);
}
static int setup_scratch_page(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct page *page;
dma_addr_t dma_addr;
page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
if (page == NULL)
return -ENOMEM;
get_page(page);
set_pages_uc(page, 1);
#ifdef CONFIG_INTEL_IOMMU
dma_addr = pci_map_page(dev->pdev, page, 0, PAGE_SIZE,
PCI_DMA_BIDIRECTIONAL);
if (pci_dma_mapping_error(dev->pdev, dma_addr))
return -EINVAL;
#else
dma_addr = page_to_phys(page);
#endif
dev_priv->gtt.base.scratch.page = page;
dev_priv->gtt.base.scratch.addr = dma_addr;
return 0;
}
static void teardown_scratch_page(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct page *page = dev_priv->gtt.base.scratch.page;
set_pages_wb(page, 1);
pci_unmap_page(dev->pdev, dev_priv->gtt.base.scratch.addr,
PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
put_page(page);
__free_page(page);
}
static inline unsigned int gen6_get_total_gtt_size(u16 snb_gmch_ctl)
{
snb_gmch_ctl >>= SNB_GMCH_GGMS_SHIFT;
snb_gmch_ctl &= SNB_GMCH_GGMS_MASK;
return snb_gmch_ctl << 20;
}
static inline unsigned int gen8_get_total_gtt_size(u16 bdw_gmch_ctl)
{
bdw_gmch_ctl >>= BDW_GMCH_GGMS_SHIFT;
bdw_gmch_ctl &= BDW_GMCH_GGMS_MASK;
if (bdw_gmch_ctl)
bdw_gmch_ctl = 1 << bdw_gmch_ctl;
#ifdef CONFIG_X86_32
/* Limit 32b platforms to a 2GB GGTT: 4 << 20 / pte size * PAGE_SIZE */
if (bdw_gmch_ctl > 4)
bdw_gmch_ctl = 4;
#endif
return bdw_gmch_ctl << 20;
}
static inline unsigned int chv_get_total_gtt_size(u16 gmch_ctrl)
{
gmch_ctrl >>= SNB_GMCH_GGMS_SHIFT;
gmch_ctrl &= SNB_GMCH_GGMS_MASK;
if (gmch_ctrl)
return 1 << (20 + gmch_ctrl);
return 0;
}
static inline size_t gen6_get_stolen_size(u16 snb_gmch_ctl)
{
snb_gmch_ctl >>= SNB_GMCH_GMS_SHIFT;
snb_gmch_ctl &= SNB_GMCH_GMS_MASK;
return snb_gmch_ctl << 25; /* 32 MB units */
}
static inline size_t gen8_get_stolen_size(u16 bdw_gmch_ctl)
{
bdw_gmch_ctl >>= BDW_GMCH_GMS_SHIFT;
bdw_gmch_ctl &= BDW_GMCH_GMS_MASK;
return bdw_gmch_ctl << 25; /* 32 MB units */
}
static size_t chv_get_stolen_size(u16 gmch_ctrl)
{
gmch_ctrl >>= SNB_GMCH_GMS_SHIFT;
gmch_ctrl &= SNB_GMCH_GMS_MASK;
/*
* 0x0 to 0x10: 32MB increments starting at 0MB
* 0x11 to 0x16: 4MB increments starting at 8MB
* 0x17 to 0x1d: 4MB increments start at 36MB
*/
if (gmch_ctrl < 0x11)
return gmch_ctrl << 25;
else if (gmch_ctrl < 0x17)
return (gmch_ctrl - 0x11 + 2) << 22;
else
return (gmch_ctrl - 0x17 + 9) << 22;
}
static int ggtt_probe_common(struct drm_device *dev,
size_t gtt_size)
{
struct drm_i915_private *dev_priv = dev->dev_private;
phys_addr_t gtt_phys_addr;
int ret;
/* For Modern GENs the PTEs and register space are split in the BAR */
gtt_phys_addr = pci_resource_start(dev->pdev, 0) +
(pci_resource_len(dev->pdev, 0) / 2);
dev_priv->gtt.gsm = ioremap_wc(gtt_phys_addr, gtt_size);
if (!dev_priv->gtt.gsm) {
DRM_ERROR("Failed to map the gtt page table\n");
return -ENOMEM;
}
ret = setup_scratch_page(dev);
if (ret) {
DRM_ERROR("Scratch setup failed\n");
/* iounmap will also get called at remove, but meh */
iounmap(dev_priv->gtt.gsm);
}
return ret;
}
/* The GGTT and PPGTT need a private PPAT setup in order to handle cacheability
* bits. When using advanced contexts each context stores its own PAT, but
* writing this data shouldn't be harmful even in those cases. */
static void bdw_setup_private_ppat(struct drm_i915_private *dev_priv)
{
uint64_t pat;
pat = GEN8_PPAT(0, GEN8_PPAT_WB | GEN8_PPAT_LLC) | /* for normal objects, no eLLC */
GEN8_PPAT(1, GEN8_PPAT_WC | GEN8_PPAT_LLCELLC) | /* for something pointing to ptes? */
GEN8_PPAT(2, GEN8_PPAT_WT | GEN8_PPAT_LLCELLC) | /* for scanout with eLLC */
GEN8_PPAT(3, GEN8_PPAT_UC) | /* Uncached objects, mostly for scanout */
GEN8_PPAT(4, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(0)) |
GEN8_PPAT(5, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(1)) |
GEN8_PPAT(6, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(2)) |
GEN8_PPAT(7, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(3));
/* XXX: spec defines this as 2 distinct registers. It's unclear if a 64b
* write would work. */
I915_WRITE(GEN8_PRIVATE_PAT, pat);
I915_WRITE(GEN8_PRIVATE_PAT + 4, pat >> 32);
}
static void chv_setup_private_ppat(struct drm_i915_private *dev_priv)
{
uint64_t pat;
/*
* Map WB on BDW to snooped on CHV.
*
* Only the snoop bit has meaning for CHV, the rest is
* ignored.
*
* Note that the harware enforces snooping for all page
* table accesses. The snoop bit is actually ignored for
* PDEs.
*/
pat = GEN8_PPAT(0, CHV_PPAT_SNOOP) |
GEN8_PPAT(1, 0) |
GEN8_PPAT(2, 0) |
GEN8_PPAT(3, 0) |
GEN8_PPAT(4, CHV_PPAT_SNOOP) |
GEN8_PPAT(5, CHV_PPAT_SNOOP) |
GEN8_PPAT(6, CHV_PPAT_SNOOP) |
GEN8_PPAT(7, CHV_PPAT_SNOOP);
I915_WRITE(GEN8_PRIVATE_PAT, pat);
I915_WRITE(GEN8_PRIVATE_PAT + 4, pat >> 32);
}
static int gen8_gmch_probe(struct drm_device *dev,
size_t *gtt_total,
size_t *stolen,
phys_addr_t *mappable_base,
unsigned long *mappable_end)
{
struct drm_i915_private *dev_priv = dev->dev_private;
unsigned int gtt_size;
u16 snb_gmch_ctl;
int ret;
/* TODO: We're not aware of mappable constraints on gen8 yet */
*mappable_base = pci_resource_start(dev->pdev, 2);
*mappable_end = pci_resource_len(dev->pdev, 2);
if (!pci_set_dma_mask(dev->pdev, DMA_BIT_MASK(39)))
pci_set_consistent_dma_mask(dev->pdev, DMA_BIT_MASK(39));
pci_read_config_word(dev->pdev, SNB_GMCH_CTRL, &snb_gmch_ctl);
if (IS_CHERRYVIEW(dev)) {
*stolen = chv_get_stolen_size(snb_gmch_ctl);
gtt_size = chv_get_total_gtt_size(snb_gmch_ctl);
} else {
*stolen = gen8_get_stolen_size(snb_gmch_ctl);
gtt_size = gen8_get_total_gtt_size(snb_gmch_ctl);
}
*gtt_total = (gtt_size / sizeof(gen8_gtt_pte_t)) << PAGE_SHIFT;
if (IS_CHERRYVIEW(dev))
chv_setup_private_ppat(dev_priv);
else
bdw_setup_private_ppat(dev_priv);
ret = ggtt_probe_common(dev, gtt_size);
dev_priv->gtt.base.clear_range = gen8_ggtt_clear_range;
dev_priv->gtt.base.insert_entries = gen8_ggtt_insert_entries;
return ret;
}
static int gen6_gmch_probe(struct drm_device *dev,
size_t *gtt_total,
size_t *stolen,
phys_addr_t *mappable_base,
unsigned long *mappable_end)
{
struct drm_i915_private *dev_priv = dev->dev_private;
unsigned int gtt_size;
u16 snb_gmch_ctl;
int ret;
*mappable_base = pci_resource_start(dev->pdev, 2);
*mappable_end = pci_resource_len(dev->pdev, 2);
/* 64/512MB is the current min/max we actually know of, but this is just
* a coarse sanity check.
*/
if ((*mappable_end < (64<<20) || (*mappable_end > (512<<20)))) {
DRM_ERROR("Unknown GMADR size (%lx)\n",
dev_priv->gtt.mappable_end);
return -ENXIO;
}
if (!pci_set_dma_mask(dev->pdev, DMA_BIT_MASK(40)))
pci_set_consistent_dma_mask(dev->pdev, DMA_BIT_MASK(40));
pci_read_config_word(dev->pdev, SNB_GMCH_CTRL, &snb_gmch_ctl);
*stolen = gen6_get_stolen_size(snb_gmch_ctl);
gtt_size = gen6_get_total_gtt_size(snb_gmch_ctl);
*gtt_total = (gtt_size / sizeof(gen6_gtt_pte_t)) << PAGE_SHIFT;
ret = ggtt_probe_common(dev, gtt_size);
dev_priv->gtt.base.clear_range = gen6_ggtt_clear_range;
dev_priv->gtt.base.insert_entries = gen6_ggtt_insert_entries;
return ret;
}
static void gen6_gmch_remove(struct i915_address_space *vm)
{
struct i915_gtt *gtt = container_of(vm, struct i915_gtt, base);
if (drm_mm_initialized(&vm->mm)) {
drm_mm_takedown(&vm->mm);
list_del(&vm->global_link);
}
iounmap(gtt->gsm);
teardown_scratch_page(vm->dev);
}
static int i915_gmch_probe(struct drm_device *dev,
size_t *gtt_total,
size_t *stolen,
phys_addr_t *mappable_base,
unsigned long *mappable_end)
{
struct drm_i915_private *dev_priv = dev->dev_private;
int ret;
ret = intel_gmch_probe(dev_priv->bridge_dev, dev_priv->dev->pdev, NULL);
if (!ret) {
DRM_ERROR("failed to set up gmch\n");
return -EIO;
}
intel_gtt_get(gtt_total, stolen, mappable_base, mappable_end);
dev_priv->gtt.do_idle_maps = needs_idle_maps(dev_priv->dev);
dev_priv->gtt.base.clear_range = i915_ggtt_clear_range;
if (unlikely(dev_priv->gtt.do_idle_maps))
DRM_INFO("applying Ironlake quirks for intel_iommu\n");
return 0;
}
static void i915_gmch_remove(struct i915_address_space *vm)
{
// intel_gmch_remove();
}
int i915_gem_gtt_init(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct i915_gtt *gtt = &dev_priv->gtt;
int ret;
if (INTEL_INFO(dev)->gen <= 5) {
gtt->gtt_probe = i915_gmch_probe;
gtt->base.cleanup = i915_gmch_remove;
} else if (INTEL_INFO(dev)->gen < 8) {
gtt->gtt_probe = gen6_gmch_probe;
gtt->base.cleanup = gen6_gmch_remove;
if (IS_HASWELL(dev) && dev_priv->ellc_size)
gtt->base.pte_encode = iris_pte_encode;
else if (IS_HASWELL(dev))
gtt->base.pte_encode = hsw_pte_encode;
else if (IS_VALLEYVIEW(dev))
gtt->base.pte_encode = byt_pte_encode;
else if (INTEL_INFO(dev)->gen >= 7)
gtt->base.pte_encode = ivb_pte_encode;
else
gtt->base.pte_encode = snb_pte_encode;
} else {
dev_priv->gtt.gtt_probe = gen8_gmch_probe;
dev_priv->gtt.base.cleanup = gen6_gmch_remove;
}
ret = gtt->gtt_probe(dev, &gtt->base.total, &gtt->stolen_size,
&gtt->mappable_base, &gtt->mappable_end);
if (ret)
return ret;
gtt->base.dev = dev;
/* GMADR is the PCI mmio aperture into the global GTT. */
DRM_INFO("Memory usable by graphics device = %zdM\n",
gtt->base.total >> 20);
DRM_DEBUG_DRIVER("GMADR size = %ldM\n", gtt->mappable_end >> 20);
DRM_DEBUG_DRIVER("GTT stolen size = %zdM\n", gtt->stolen_size >> 20);
#ifdef CONFIG_INTEL_IOMMU
if (intel_iommu_gfx_mapped)
DRM_INFO("VT-d active for gfx access\n");
#endif
/*
* i915.enable_ppgtt is read-only, so do an early pass to validate the
* user's requested state against the hardware/driver capabilities. We
* do this now so that we can print out any log messages once rather
* than every time we check intel_enable_ppgtt().
*/
i915.enable_ppgtt = sanitize_enable_ppgtt(dev, i915.enable_ppgtt);
DRM_DEBUG_DRIVER("ppgtt mode: %i\n", i915.enable_ppgtt);
return 0;
}
static struct i915_vma *__i915_gem_vma_create(struct drm_i915_gem_object *obj,
struct i915_address_space *vm)
{
struct i915_vma *vma = kzalloc(sizeof(*vma), GFP_KERNEL);
if (vma == NULL)
return ERR_PTR(-ENOMEM);
INIT_LIST_HEAD(&vma->vma_link);
INIT_LIST_HEAD(&vma->mm_list);
INIT_LIST_HEAD(&vma->exec_list);
vma->vm = vm;
vma->obj = obj;
switch (INTEL_INFO(vm->dev)->gen) {
case 8:
case 7:
case 6:
if (i915_is_ggtt(vm)) {
vma->unbind_vma = ggtt_unbind_vma;
vma->bind_vma = ggtt_bind_vma;
} else {
vma->unbind_vma = ppgtt_unbind_vma;
vma->bind_vma = ppgtt_bind_vma;
}
break;
case 5:
case 4:
case 3:
case 2:
BUG_ON(!i915_is_ggtt(vm));
vma->unbind_vma = i915_ggtt_unbind_vma;
vma->bind_vma = i915_ggtt_bind_vma;
break;
default:
BUG();
}
/* Keep GGTT vmas first to make debug easier */
if (i915_is_ggtt(vm))
list_add(&vma->vma_link, &obj->vma_list);
else
list_add_tail(&vma->vma_link, &obj->vma_list);
return vma;
}
struct i915_vma *
i915_gem_obj_lookup_or_create_vma(struct drm_i915_gem_object *obj,
struct i915_address_space *vm)
{
struct i915_vma *vma;
vma = i915_gem_obj_to_vma(obj, vm);
if (!vma)
vma = __i915_gem_vma_create(obj, vm);
return vma;
}
struct scatterlist *sg_next(struct scatterlist *sg)
{
if (sg_is_last(sg))
return NULL;
sg++;
if (unlikely(sg_is_chain(sg)))
sg = sg_chain_ptr(sg);
return sg;
}
void __sg_free_table(struct sg_table *table, unsigned int max_ents,
bool skip_first_chunk, sg_free_fn *free_fn)
{
struct scatterlist *sgl, *next;
if (unlikely(!table->sgl))
return;
sgl = table->sgl;
while (table->orig_nents) {
unsigned int alloc_size = table->orig_nents;
unsigned int sg_size;
/*
* If we have more than max_ents segments left,
* then assign 'next' to the sg table after the current one.
* sg_size is then one less than alloc size, since the last
* element is the chain pointer.
*/
if (alloc_size > max_ents) {
next = sg_chain_ptr(&sgl[max_ents - 1]);
alloc_size = max_ents;
sg_size = alloc_size - 1;
} else {
sg_size = alloc_size;
next = NULL;
}
table->orig_nents -= sg_size;
if (!skip_first_chunk) {
kfree(sgl);
skip_first_chunk = false;
}
sgl = next;
}
table->sgl = NULL;
}
void sg_free_table(struct sg_table *table)
{
__sg_free_table(table, SG_MAX_SINGLE_ALLOC, false, NULL);
}
int sg_alloc_table(struct sg_table *table, unsigned int nents, gfp_t gfp_mask)
{
struct scatterlist *sg, *prv;
unsigned int left;
unsigned int max_ents = SG_MAX_SINGLE_ALLOC;
#ifndef ARCH_HAS_SG_CHAIN
BUG_ON(nents > max_ents);
#endif
memset(table, 0, sizeof(*table));
left = nents;
prv = NULL;
do {
unsigned int sg_size, alloc_size = left;
if (alloc_size > max_ents) {
alloc_size = max_ents;
sg_size = alloc_size - 1;
} else
sg_size = alloc_size;
left -= sg_size;
sg = kmalloc(alloc_size * sizeof(struct scatterlist), gfp_mask);
if (unlikely(!sg)) {
/*
* Adjust entry count to reflect that the last
* entry of the previous table won't be used for
* linkage. Without this, sg_kfree() may get
* confused.
*/
if (prv)
table->nents = ++table->orig_nents;
goto err;
}
sg_init_table(sg, alloc_size);
table->nents = table->orig_nents += sg_size;
/*
* If this is the first mapping, assign the sg table header.
* If this is not the first mapping, chain previous part.
*/
if (prv)
sg_chain(prv, max_ents, sg);
else
table->sgl = sg;
/*
* If no more entries after this one, mark the end
*/
if (!left)
sg_mark_end(&sg[sg_size - 1]);
prv = sg;
} while (left);
return 0;
err:
__sg_free_table(table, SG_MAX_SINGLE_ALLOC, false, NULL);
return -ENOMEM;
}
void sg_init_table(struct scatterlist *sgl, unsigned int nents)
{
memset(sgl, 0, sizeof(*sgl) * nents);
#ifdef CONFIG_DEBUG_SG
{
unsigned int i;
for (i = 0; i < nents; i++)
sgl[i].sg_magic = SG_MAGIC;
}
#endif
sg_mark_end(&sgl[nents - 1]);
}
void __sg_page_iter_start(struct sg_page_iter *piter,
struct scatterlist *sglist, unsigned int nents,
unsigned long pgoffset)
{
piter->__pg_advance = 0;
piter->__nents = nents;
piter->sg = sglist;
piter->sg_pgoffset = pgoffset;
}
static int sg_page_count(struct scatterlist *sg)
{
return PAGE_ALIGN(sg->offset + sg->length) >> PAGE_SHIFT;
}
bool __sg_page_iter_next(struct sg_page_iter *piter)
{
if (!piter->__nents || !piter->sg)
return false;
piter->sg_pgoffset += piter->__pg_advance;
piter->__pg_advance = 1;
while (piter->sg_pgoffset >= sg_page_count(piter->sg)) {
piter->sg_pgoffset -= sg_page_count(piter->sg);
piter->sg = sg_next(piter->sg);
if (!--piter->__nents || !piter->sg)
return false;
}
return true;
}
EXPORT_SYMBOL(__sg_page_iter_next);
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