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drm/i915/gen8: Abstract PDP usage

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Up until now, ppgtt->pdp has always been the root of our page tables.
Legacy 32b addresses acted like it had 1 PDP with 4 PDPEs.

In preparation for 4 level page tables, we need to stop using ppgtt->pdp
directly unless we know it's what we want. The future structure will use
ppgtt->pml4 for the top level, and the pdp is just one of the entries
being pointed to by a pml4e. The temporal pdp local variable will be
removed once the rest of the 4-level code lands.

Also, start passing the vm pointer to the alloc functions, instead of
ppgtt.

v2: Updated after dynamic page allocation changes.
v3: Rebase after s/page_tables/page_table/.
v4: Rebase after changes in "Dynamic page table allocations" patch.
v5: Rebase after Mika's ppgtt cleanup / scratch merge patch series.
v6: Rebase after final merged version of Mika's ppgtt/scratch patches.
v7: Keep pagetable map in-line (and avoid unnecessary for_each_pde
loops), remove redundant ppgtt pointer in _alloc_pagetabs (Akash)
v8: Fix text indentation in _alloc_pagetabs/page_directories (Chris)
v9: Defer gen8_alloc_va_range_4lvl definition until 4lvl is implemented,
clean-up gen8_ppgtt_cleanup [pun intended] (Akash).
v10: Clean-up commit message (Akash).

Cc: Akash Goel <akash.goel@intel.com>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Michel Thierry <michel.thierry@intel.com> (v2+)
Reviewed-by: "Akash Goel" <akash.goel@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Michel Thierry 2015-07-30 11:02:03 +01:00 committed by Daniel Vetter
parent 6ac1850220
commit d4ec9da0e1
1 changed files with 44 additions and 40 deletions
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84
drivers/gpu/drm/i915/i915_gem_gtt.c
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@ -607,6 +607,7 @@ static void gen8_ppgtt_clear_range(struct i915_address_space *vm,
{
struct i915_hw_ppgtt *ppgtt =
container_of(vm, struct i915_hw_ppgtt, base);
struct i915_page_directory_pointer *pdp = &ppgtt->pdp; /* FIXME: 48b */
gen8_pte_t *pt_vaddr, scratch_pte;
unsigned pdpe = start >> GEN8_PDPE_SHIFT & GEN8_PDPE_MASK;
unsigned pde = start >> GEN8_PDE_SHIFT & GEN8_PDE_MASK;
@ -621,10 +622,10 @@ static void gen8_ppgtt_clear_range(struct i915_address_space *vm,
struct i915_page_directory *pd;
struct i915_page_table *pt;
if (WARN_ON(!ppgtt->pdp.page_directory[pdpe]))
if (WARN_ON(!pdp->page_directory[pdpe]))
break;
pd = ppgtt->pdp.page_directory[pdpe];
pd = pdp->page_directory[pdpe];
if (WARN_ON(!pd->page_table[pde]))
break;
@ -662,6 +663,7 @@ static void gen8_ppgtt_insert_entries(struct i915_address_space *vm,
{
struct i915_hw_ppgtt *ppgtt =
container_of(vm, struct i915_hw_ppgtt, base);
struct i915_page_directory_pointer *pdp = &ppgtt->pdp; /* FIXME: 48b */
gen8_pte_t *pt_vaddr;
unsigned pdpe = start >> GEN8_PDPE_SHIFT & GEN8_PDPE_MASK;
unsigned pde = start >> GEN8_PDE_SHIFT & GEN8_PDE_MASK;
@ -675,7 +677,7 @@ static void gen8_ppgtt_insert_entries(struct i915_address_space *vm,
break;
if (pt_vaddr == NULL) {
struct i915_page_directory *pd = ppgtt->pdp.page_directory[pdpe];
struct i915_page_directory *pd = pdp->page_directory[pdpe];
struct i915_page_table *pt = pd->page_table[pde];
pt_vaddr = kmap_px(pt);
}
@ -755,28 +757,29 @@ static void gen8_ppgtt_cleanup(struct i915_address_space *vm)
{
struct i915_hw_ppgtt *ppgtt =
container_of(vm, struct i915_hw_ppgtt, base);
struct i915_page_directory_pointer *pdp = &ppgtt->pdp; /* FIXME: 48b */
struct drm_device *dev = ppgtt->base.dev;
int i;
for_each_set_bit(i, ppgtt->pdp.used_pdpes,
I915_PDPES_PER_PDP(ppgtt->base.dev)) {
if (WARN_ON(!ppgtt->pdp.page_directory[i]))
for_each_set_bit(i, pdp->used_pdpes, I915_PDPES_PER_PDP(dev)) {
if (WARN_ON(!pdp->page_directory[i]))
continue;
gen8_free_page_tables(ppgtt->base.dev,
ppgtt->pdp.page_directory[i]);
free_pd(ppgtt->base.dev, ppgtt->pdp.page_directory[i]);
gen8_free_page_tables(dev, pdp->page_directory[i]);
free_pd(dev, pdp->page_directory[i]);
}
free_pdp(ppgtt->base.dev, &ppgtt->pdp);
free_pdp(dev, pdp);
gen8_free_scratch(vm);
}
/**
* gen8_ppgtt_alloc_pagetabs() - Allocate page tables for VA range.
* @ppgtt: Master ppgtt structure.
* @pd: Page directory for this address range.
* @vm: Master vm structure.
* @pd: Page directory for this address range.
* @start: Starting virtual address to begin allocations.
* @length Size of the allocations.
* @length: Size of the allocations.
* @new_pts: Bitmap set by function with new allocations. Likely used by the
* caller to free on error.
*
@ -789,13 +792,13 @@ static void gen8_ppgtt_cleanup(struct i915_address_space *vm)
*
* Return: 0 if success; negative error code otherwise.
*/
static int gen8_ppgtt_alloc_pagetabs(struct i915_hw_ppgtt *ppgtt,
static int gen8_ppgtt_alloc_pagetabs(struct i915_address_space *vm,
struct i915_page_directory *pd,
uint64_t start,
uint64_t length,
unsigned long *new_pts)
{
struct drm_device *dev = ppgtt->base.dev;
struct drm_device *dev = vm->dev;
struct i915_page_table *pt;
uint64_t temp;
uint32_t pde;
@ -804,7 +807,7 @@ static int gen8_ppgtt_alloc_pagetabs(struct i915_hw_ppgtt *ppgtt,
/* Don't reallocate page tables */
if (test_bit(pde, pd->used_pdes)) {
/* Scratch is never allocated this way */
WARN_ON(pt == ppgtt->base.scratch_pt);
WARN_ON(pt == vm->scratch_pt);
continue;
}
@ -812,7 +815,7 @@ static int gen8_ppgtt_alloc_pagetabs(struct i915_hw_ppgtt *ppgtt,
if (IS_ERR(pt))
goto unwind_out;
gen8_initialize_pt(&ppgtt->base, pt);
gen8_initialize_pt(vm, pt);
pd->page_table[pde] = pt;
__set_bit(pde, new_pts);
}
@ -828,11 +831,11 @@ unwind_out:
/**
* gen8_ppgtt_alloc_page_directories() - Allocate page directories for VA range.
* @ppgtt: Master ppgtt structure.
* @vm: Master vm structure.
* @pdp: Page directory pointer for this address range.
* @start: Starting virtual address to begin allocations.
* @length Size of the allocations.
* @new_pds Bitmap set by function with new allocations. Likely used by the
* @length: Size of the allocations.
* @new_pds: Bitmap set by function with new allocations. Likely used by the
* caller to free on error.
*
* Allocate the required number of page directories starting at the pde index of
@ -849,13 +852,14 @@ unwind_out:
*
* Return: 0 if success; negative error code otherwise.
*/
static int gen8_ppgtt_alloc_page_directories(struct i915_hw_ppgtt *ppgtt,
struct i915_page_directory_pointer *pdp,
uint64_t start,
uint64_t length,
unsigned long *new_pds)
static int
gen8_ppgtt_alloc_page_directories(struct i915_address_space *vm,
struct i915_page_directory_pointer *pdp,
uint64_t start,
uint64_t length,
unsigned long *new_pds)
{
struct drm_device *dev = ppgtt->base.dev;
struct drm_device *dev = vm->dev;
struct i915_page_directory *pd;
uint64_t temp;
uint32_t pdpe;
@ -871,7 +875,7 @@ static int gen8_ppgtt_alloc_page_directories(struct i915_hw_ppgtt *ppgtt,
if (IS_ERR(pd))
goto unwind_out;
gen8_initialize_pd(&ppgtt->base, pd);
gen8_initialize_pd(vm, pd);
pdp->page_directory[pdpe] = pd;
__set_bit(pdpe, new_pds);
}
@ -947,18 +951,19 @@ static void mark_tlbs_dirty(struct i915_hw_ppgtt *ppgtt)
}
static int gen8_alloc_va_range(struct i915_address_space *vm,
uint64_t start,
uint64_t length)
uint64_t start, uint64_t length)
{
struct i915_hw_ppgtt *ppgtt =
container_of(vm, struct i915_hw_ppgtt, base);
unsigned long *new_page_dirs, **new_page_tables;
struct drm_device *dev = vm->dev;
struct i915_page_directory_pointer *pdp = &ppgtt->pdp; /* FIXME: 48b */
struct i915_page_directory *pd;
const uint64_t orig_start = start;
const uint64_t orig_length = length;
uint64_t temp;
uint32_t pdpe;
uint32_t pdpes = I915_PDPES_PER_PDP(ppgtt->base.dev);
uint32_t pdpes = I915_PDPES_PER_PDP(dev);
int ret;
/* Wrap is never okay since we can only represent 48b, and we don't
@ -967,7 +972,7 @@ static int gen8_alloc_va_range(struct i915_address_space *vm,
if (WARN_ON(start + length < start))
return -ENODEV;
if (WARN_ON(start + length > ppgtt->base.total))
if (WARN_ON(start + length > vm->total))
return -ENODEV;
ret = alloc_gen8_temp_bitmaps(&new_page_dirs, &new_page_tables, pdpes);
@ -975,16 +980,16 @@ static int gen8_alloc_va_range(struct i915_address_space *vm,
return ret;
/* Do the allocations first so we can easily bail out */
ret = gen8_ppgtt_alloc_page_directories(ppgtt, &ppgtt->pdp, start, length,
new_page_dirs);
ret = gen8_ppgtt_alloc_page_directories(vm, pdp, start, length,
new_page_dirs);
if (ret) {
free_gen8_temp_bitmaps(new_page_dirs, new_page_tables, pdpes);
return ret;
}
/* For every page directory referenced, allocate page tables */
gen8_for_each_pdpe(pd, &ppgtt->pdp, start, length, temp, pdpe) {
ret = gen8_ppgtt_alloc_pagetabs(ppgtt, pd, start, length,
gen8_for_each_pdpe(pd, pdp, start, length, temp, pdpe) {
ret = gen8_ppgtt_alloc_pagetabs(vm, pd, start, length,
new_page_tables[pdpe]);
if (ret)
goto err_out;
@ -995,7 +1000,7 @@ static int gen8_alloc_va_range(struct i915_address_space *vm,
/* Allocations have completed successfully, so set the bitmaps, and do
* the mappings. */
gen8_for_each_pdpe(pd, &ppgtt->pdp, start, length, temp, pdpe) {
gen8_for_each_pdpe(pd, pdp, start, length, temp, pdpe) {
gen8_pde_t *const page_directory = kmap_px(pd);
struct i915_page_table *pt;
uint64_t pd_len = length;
@ -1028,8 +1033,7 @@ static int gen8_alloc_va_range(struct i915_address_space *vm,
}
kunmap_px(ppgtt, page_directory);
__set_bit(pdpe, ppgtt->pdp.used_pdpes);
__set_bit(pdpe, pdp->used_pdpes);
}
free_gen8_temp_bitmaps(new_page_dirs, new_page_tables, pdpes);
@ -1039,11 +1043,11 @@ static int gen8_alloc_va_range(struct i915_address_space *vm,
err_out:
while (pdpe--) {
for_each_set_bit(temp, new_page_tables[pdpe], I915_PDES)
free_pt(vm->dev, ppgtt->pdp.page_directory[pdpe]->page_table[temp]);
free_pt(dev, pdp->page_directory[pdpe]->page_table[temp]);
}
for_each_set_bit(pdpe, new_page_dirs, pdpes)
free_pd(vm->dev, ppgtt->pdp.page_directory[pdpe]);
free_pd(dev, pdp->page_directory[pdpe]);
free_gen8_temp_bitmaps(new_page_dirs, new_page_tables, pdpes);
mark_tlbs_dirty(ppgtt);