Let's use more top-down approach, where each gen8_ppgtt_clear_* function
is responsible for clearing the struct passed as an argument and calling
relevant clear_range functions on lower-level tables.
Doing this rather than operating on PTE ranges makes the implementation
of shrinking page tables quite simple.
v2: Drop min when calculating num_entries, no negation in 48b ppgtt
check, no newlines in vars block (Joonas)
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Cc: Michel Thierry <michel.thierry@xxxxxxxxx>
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
Signed-off-by: Michał Winiarski <michal.winiarski@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem_gtt.c | 107 +++++++++++++++++++-----------------
1 file changed, 58 insertions(+), 49 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 48ec9c5..c284d8d 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -704,59 +704,78 @@ static int gen8_48b_mm_switch(struct i915_hw_ppgtt *ppgtt,
return gen8_write_pdp(req, 0, px_dma(&ppgtt->pml4));
}
-static void gen8_ppgtt_clear_pte_range(struct i915_address_space *vm,
- struct i915_page_directory_pointer *pdp,
- uint64_t start,
- uint64_t length,
- gen8_pte_t scratch_pte)
+static void gen8_ppgtt_clear_pt(struct i915_address_space *vm,
+ struct i915_page_table *pt,
+ uint64_t start,
+ uint64_t length)
{
struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
+
+ unsigned int pte_start = gen8_pte_index(start);
+ unsigned int num_entries = gen8_pte_count(start, length);
+ uint64_t pte;
gen8_pte_t *pt_vaddr;
- 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;
+ gen8_pte_t scratch_pte = gen8_pte_encode(vm->scratch_page.daddr,
+ I915_CACHE_LLC);
- if (WARN_ON(!pdp))
+ if (WARN_ON(!px_page(pt)))
return;
- while (num_entries) {
- struct i915_page_directory *pd;
- struct i915_page_table *pt;
+ bitmap_clear(pt->used_ptes, pte_start, num_entries);
- if (WARN_ON(!pdp->page_directory[pdpe]))
- break;
+ pt_vaddr = kmap_px(pt);
+
+ for (pte = pte_start; pte < num_entries; pte++)
+ pt_vaddr[pte] = scratch_pte;
- pd = pdp->page_directory[pdpe];
+ kunmap_px(ppgtt, pt_vaddr);
+}
+
+static void gen8_ppgtt_clear_pd(struct i915_address_space *vm,
+ struct i915_page_directory *pd,
+ uint64_t start,
+ uint64_t length)
+{
+ struct i915_page_table *pt;
+ uint64_t pde;
+ gen8_for_each_pde(pt, pd, start, length, pde) {
if (WARN_ON(!pd->page_table[pde]))
break;
- pt = pd->page_table[pde];
+ gen8_ppgtt_clear_pt(vm, pt, start, length);
+ }
+}
- if (WARN_ON(!px_page(pt)))
- break;
+static void gen8_ppgtt_clear_pdp(struct i915_address_space *vm,
+ struct i915_page_directory_pointer *pdp,
+ uint64_t start,
+ uint64_t length)
+{
+ struct i915_page_directory *pd;
+ uint64_t pdpe;
- last_pte = pte + num_entries;
- if (last_pte > GEN8_PTES)
- last_pte = GEN8_PTES;
+ gen8_for_each_pdpe(pd, pdp, start, length, pdpe) {
+ if (WARN_ON(!pdp->page_directory[pdpe]))
+ break;
- pt_vaddr = kmap_px(pt);
+ gen8_ppgtt_clear_pd(vm, pd, start, length);
+ }
+}
- for (i = pte; i < last_pte; i++) {
- pt_vaddr[i] = scratch_pte;
- num_entries--;
- }
+static void gen8_ppgtt_clear_pml4(struct i915_address_space *vm,
+ struct i915_pml4 *pml4,
+ uint64_t start,
+ uint64_t length)
+{
+ struct i915_page_directory_pointer *pdp;
+ uint64_t pml4e;
- kunmap_px(ppgtt, pt_vaddr);
+ gen8_for_each_pml4e(pdp, pml4, start, length, pml4e) {
+ if (WARN_ON(!pml4->pdps[pml4e]))
+ break;
- pte = 0;
- if (++pde == I915_PDES) {
- if (++pdpe == I915_PDPES_PER_PDP(vm->dev))
- break;
- pde = 0;
- }
+ gen8_ppgtt_clear_pdp(vm, pdp, start, length);
}
}
@@ -764,21 +783,11 @@ static void gen8_ppgtt_clear_range(struct i915_address_space *vm,
uint64_t start, uint64_t length)
{
struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
- gen8_pte_t scratch_pte = gen8_pte_encode(vm->scratch_page.daddr,
- I915_CACHE_LLC);
- if (!USES_FULL_48BIT_PPGTT(vm->dev)) {
- gen8_ppgtt_clear_pte_range(vm, &ppgtt->pdp, start, length,
- scratch_pte);
- } else {
- uint64_t pml4e;
- struct i915_page_directory_pointer *pdp;
-
- gen8_for_each_pml4e(pdp, &ppgtt->pml4, start, length, pml4e) {
- gen8_ppgtt_clear_pte_range(vm, pdp, start, length,
- scratch_pte);
- }
- }
+ if (USES_FULL_48BIT_PPGTT(vm->dev))
+ gen8_ppgtt_clear_pml4(vm, &ppgtt->pml4, start, length);
+ else
+ gen8_ppgtt_clear_pdp(vm, &ppgtt->pdp, start, length);
}
static void
--
2.7.4
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