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drm/i915/gen8: Add 4 level support in insert_entries and clear_range 

When 48b is enabled, gen8_ppgtt_insert_entries needs to read the Page Map
Level 4 (PML4), before it selects which Page Directory Pointer (PDP)
it will write to.

Similarly, gen8_ppgtt_clear_range needs to get the correct PDP/PD range.

This patch was inspired by Ben's "Depend exclusively on map and
unmap_vma".

v2: Rebase after s/page_tables/page_table/.
v3: Remove unnecessary pdpe loop in gen8_ppgtt_clear_range_4lvl and use
clamp_pdp in gen8_ppgtt_insert_entries (Akash).
v4: Merge gen8_ppgtt_clear_range_4lvl into gen8_ppgtt_clear_range to
maintain symmetry with gen8_ppgtt_insert_entries (Akash).
v5: Do not mix pages and bytes in insert_entries (Akash).
v6: Prevent overflow in sg_nents << PAGE_SHIFT, when inserting 4GB at
once.
v7: Rebase after Mika's ppgtt cleanup / scratch merge patch series.
Use gen8_px_index functions, and remove unnecessary number of pages
parameter in insert_pte_entries.
v8: Change gen8_ppgtt_clear_pte_range to stop at PDP boundary, instead of
adding and extra clamp function; remove unnecessary pdp_start/pdp_len
variables (Akash).
v9: pages->orig_nents instead of sg_nents(pages->sgl) to get the
length (Akash).
v10: Remove pdp warning check ingen8_ppgtt_insert_pte_entries until this
commit (Akash).

Reviewed-by: Akash Goel <akash.goel@intel.com> (v9)
Cc: Akash Goel <akash.goel@intel.com>
Signed-off-by: Michel Thierry <michel.thierry@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Michel Thierry 2015-08-03 09:53:27 +01:00 committed by Daniel Vetter
parent 3387d433b0
commit de5ba8eb9c
1 changed files with 36 additions and 16 deletions
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52
drivers/gpu/drm/i915/i915_gem_gtt.c
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@ -681,9 +681,9 @@ static void gen8_ppgtt_clear_pte_range(struct i915_address_space *vm,
struct i915_hw_ppgtt *ppgtt =
container_of(vm, struct i915_hw_ppgtt, base);
gen8_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;
unsigned pdpe = gen8_pdpe_index(start);
unsigned pde = gen8_pde_index(start);
unsigned pte = gen8_pte_index(start);
unsigned num_entries = length >> PAGE_SHIFT;
unsigned last_pte, i;
@ -722,7 +722,8 @@ static void gen8_ppgtt_clear_pte_range(struct i915_address_space *vm,
pte = 0;
if (++pde == I915_PDES) {
pdpe++;
if (++pdpe == I915_PDPES_PER_PDP(vm->dev))
break;
pde = 0;
}
}
@ -735,12 +736,21 @@ 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 scratch_pte = gen8_pte_encode(px_dma(vm->scratch_page),
I915_CACHE_LLC, use_scratch);
gen8_ppgtt_clear_pte_range(vm, pdp, start, length, scratch_pte);
if (!USES_FULL_48BIT_PPGTT(vm->dev)) {
gen8_ppgtt_clear_pte_range(vm, &ppgtt->pdp, start, length,
scratch_pte);
} else {
uint64_t templ4, pml4e;
struct i915_page_directory_pointer *pdp;
gen8_for_each_pml4e(pdp, &ppgtt->pml4, start, length, templ4, pml4e) {
gen8_ppgtt_clear_pte_range(vm, pdp, start, length,
scratch_pte);
}
}
}
static void
@ -753,16 +763,13 @@ gen8_ppgtt_insert_pte_entries(struct i915_address_space *vm,
struct i915_hw_ppgtt *ppgtt =
container_of(vm, struct i915_hw_ppgtt, base);
gen8_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;
unsigned pdpe = gen8_pdpe_index(start);
unsigned pde = gen8_pde_index(start);
unsigned pte = gen8_pte_index(start);
pt_vaddr = NULL;
while (__sg_page_iter_next(sg_iter)) {
if (WARN_ON(pdpe >= GEN8_LEGACY_PDPES))
break;
if (pt_vaddr == NULL) {
struct i915_page_directory *pd = pdp->page_directory[pdpe];
struct i915_page_table *pt = pd->page_table[pde];
@ -776,7 +783,8 @@ gen8_ppgtt_insert_pte_entries(struct i915_address_space *vm,
kunmap_px(ppgtt, pt_vaddr);
pt_vaddr = NULL;
if (++pde == I915_PDES) {
pdpe++;
if (++pdpe == I915_PDPES_PER_PDP(vm->dev))
break;
pde = 0;
}
pte = 0;
@ -795,11 +803,23 @@ 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 */
struct sg_page_iter sg_iter;
__sg_page_iter_start(&sg_iter, pages->sgl, sg_nents(pages->sgl), 0);
gen8_ppgtt_insert_pte_entries(vm, pdp, &sg_iter, start, cache_level);
if (!USES_FULL_48BIT_PPGTT(vm->dev)) {
gen8_ppgtt_insert_pte_entries(vm, &ppgtt->pdp, &sg_iter, start,
cache_level);
} else {
struct i915_page_directory_pointer *pdp;
uint64_t templ4, pml4e;
uint64_t length = (uint64_t)pages->orig_nents << PAGE_SHIFT;
gen8_for_each_pml4e(pdp, &ppgtt->pml4, start, length, templ4, pml4e) {
gen8_ppgtt_insert_pte_entries(vm, pdp, &sg_iter,
start, cache_level);
}
}
}
static void gen8_free_page_tables(struct drm_device *dev,