[PATCH 61/65] drm/i915: Remove bitmap tracking for used-pml4
Chris Wilson
chris at chris-wilson.co.uk
Wed Jan 18 21:04:16 UTC 2017
We only operate on known extents (both for alloc/clear) and so we can use
both the knowledge of the bind/unbind range along with the knowledge of
the existing pagetable to avoid having to allocate temporary and
auxiliary bitmaps.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_gem_gtt.c | 132 +++++++++++-------------------------
drivers/gpu/drm/i915/i915_gem_gtt.h | 2 -
2 files changed, 38 insertions(+), 96 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 248396fd0998..ee0ad4323733 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -804,7 +804,6 @@ static void gen8_ppgtt_clear_4lvl(struct i915_address_space *vm,
continue;
gen8_ppgtt_set_pml4e(pml4, vm->scratch_pdp, pml4e);
- __clear_bit(pml4e, pml4->used_pml4es);
free_pdp(vm, pdp);
}
@@ -1018,8 +1017,8 @@ static void gen8_ppgtt_cleanup_4lvl(struct i915_hw_ppgtt *ppgtt)
{
int i;
- for_each_set_bit(i, ppgtt->pml4.used_pml4es, GEN8_PML4ES_PER_PML4) {
- if (WARN_ON(!ppgtt->pml4.pdps[i]))
+ for (i = 0; i < GEN8_PML4ES_PER_PML4; i++) {
+ if (ppgtt->pml4.pdps[i] == ppgtt->base.scratch_pdp)
continue;
gen8_ppgtt_cleanup_3lvl(&ppgtt->base, ppgtt->pml4.pdps[i]);
@@ -1073,53 +1072,9 @@ static int gen8_ppgtt_alloc_pd(struct i915_address_space *vm,
return -ENOMEM;
}
-/**
- * gen8_ppgtt_alloc_page_dirpointers() - Allocate pdps for VA range.
- * @vm: Master vm structure.
- * @pml4: Page map level 4 for this address range.
- * @start: Starting virtual address to begin allocations.
- * @length: Size of the allocations.
- * @new_pdps: Bitmap set by function with new allocations. Likely used by the
- * caller to free on error.
- *
- * Allocate the required number of page directory pointers. Extremely similar to
- * gen8_ppgtt_alloc_page_directories() and gen8_ppgtt_alloc_pd().
- * The main difference is here we are limited by the pml4 boundary (instead of
- * the page directory pointer).
- *
- * Return: 0 if success; negative error code otherwise.
- */
-static int
-gen8_ppgtt_alloc_page_dirpointers(struct i915_address_space *vm,
- struct i915_pml4 *pml4,
- uint64_t start,
- uint64_t length)
-{
- struct i915_page_directory_pointer *pdp;
- uint32_t pml4e;
-
- gen8_for_each_pml4e(pdp, pml4, start, length, pml4e) {
- if (!test_bit(pml4e, pml4->used_pml4es)) {
- pdp = alloc_pdp(vm);
- if (IS_ERR(pdp))
- return PTR_ERR(pdp);
-
- gen8_initialize_pdp(vm, pdp);
- pml4->pdps[pml4e] = pdp;
- trace_i915_page_directory_pointer_entry_alloc(vm,
- pml4e,
- start,
- GEN8_PML4E_SHIFT);
- }
- }
-
- return 0;
-}
-
-static int gen8_alloc_va_range_3lvl(struct i915_address_space *vm,
- struct i915_page_directory_pointer *pdp,
- uint64_t start,
- uint64_t length)
+static int gen8_ppgtt_alloc_pdp(struct i915_address_space *vm,
+ struct i915_page_directory_pointer *pdp,
+ u64 start, u64 length)
{
struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
struct i915_page_directory *pd;
@@ -1155,58 +1110,46 @@ static int gen8_alloc_va_range_3lvl(struct i915_address_space *vm,
return -ENOMEM;
}
-static int gen8_alloc_va_range_4lvl(struct i915_address_space *vm,
- struct i915_pml4 *pml4,
- uint64_t start,
- uint64_t length)
+static int gen8_ppgtt_alloc_3lvl(struct i915_address_space *vm,
+ u64 start, u64 length)
{
- DECLARE_BITMAP(new_pdps, GEN8_PML4ES_PER_PML4);
- struct i915_page_directory_pointer *pdp;
- uint64_t pml4e;
- int ret = 0;
-
- /* Do the pml4 allocations first, so we don't need to track the newly
- * allocated tables below the pdp */
- bitmap_zero(new_pdps, GEN8_PML4ES_PER_PML4);
+ return gen8_ppgtt_alloc_pdp(vm,
+ &i915_vm_to_ppgtt(vm)->pdp, start, length);
+}
- /* The pagedirectory and pagetable allocations are done in the shared 3
- * and 4 level code. Just allocate the pdps.
- */
- ret = gen8_ppgtt_alloc_page_dirpointers(vm, pml4, start, length);
- if (ret)
- return ret;
+static int gen8_ppgtt_alloc_4lvl(struct i915_address_space *vm,
+ u64 start, u64 length)
+{
+ struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
+ struct i915_pml4 *pml4 = &ppgtt->pml4;
+ struct i915_page_directory_pointer *pdp;
+ u64 from = start;
+ u32 pml4e;
+ int ret;
gen8_for_each_pml4e(pdp, pml4, start, length, pml4e) {
- WARN_ON(!pdp);
+ if (pml4->pdps[pml4e] == vm->scratch_pdp) {
+ pdp = alloc_pdp(vm);
+ if (IS_ERR(pdp))
+ goto unwind;
- ret = gen8_alloc_va_range_3lvl(vm, pdp, start, length);
- if (ret)
- goto err_out;
+ gen8_initialize_pdp(vm, pdp);
+ gen8_ppgtt_set_pml4e(pml4, pdp, pml4e);
+ }
- gen8_ppgtt_set_pml4e(pml4, pdp, pml4e);
+ ret = gen8_ppgtt_alloc_pdp(vm, pdp, start, length);
+ if (unlikely(ret)) {
+ gen8_ppgtt_set_pml4e(pml4, vm->scratch_pdp, pml4e);
+ free_pdp(vm, pdp);
+ goto unwind;
+ }
}
- bitmap_or(pml4->used_pml4es, new_pdps, pml4->used_pml4es,
- GEN8_PML4ES_PER_PML4);
-
return 0;
-err_out:
- for_each_set_bit(pml4e, new_pdps, GEN8_PML4ES_PER_PML4)
- gen8_ppgtt_cleanup_3lvl(vm, pml4->pdps[pml4e]);
-
- return ret;
-}
-
-static int gen8_alloc_va_range(struct i915_address_space *vm,
- uint64_t start, uint64_t length)
-{
- struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
-
- if (USES_FULL_48BIT_PPGTT(vm->i915))
- return gen8_alloc_va_range_4lvl(vm, &ppgtt->pml4, start, length);
- else
- return gen8_alloc_va_range_3lvl(vm, &ppgtt->pdp, start, length);
+unwind:
+ gen8_ppgtt_clear_4lvl(vm, from, start - from);
+ return -ENOMEM;
}
static void gen8_dump_pdp(struct i915_hw_ppgtt *ppgtt,
@@ -1280,7 +1223,7 @@ static void gen8_dump_ppgtt(struct i915_hw_ppgtt *ppgtt, struct seq_file *m)
struct i915_page_directory_pointer *pdp;
gen8_for_each_pml4e(pdp, pml4, start, length, pml4e) {
- if (!test_bit(pml4e, pml4->used_pml4es))
+ if (pml4->pdps[pml4e] == ppgtt->base.scratch_pdp)
continue;
seq_printf(m, " PML4E #%llu\n", pml4e);
@@ -1339,7 +1282,6 @@ static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt)
ppgtt->base.start = 0;
ppgtt->base.cleanup = gen8_ppgtt_cleanup;
- ppgtt->base.allocate_va_range = gen8_alloc_va_range;
ppgtt->base.unbind_vma = ppgtt_unbind_vma;
ppgtt->base.bind_vma = ppgtt_bind_vma;
ppgtt->debug_dump = gen8_dump_ppgtt;
@@ -1360,6 +1302,7 @@ static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt)
ppgtt->base.total = 1ULL << 48;
ppgtt->switch_mm = gen8_48b_mm_switch;
+ ppgtt->base.allocate_va_range = gen8_ppgtt_alloc_4lvl;
ppgtt->base.insert_entries = gen8_ppgtt_insert_4lvl;
ppgtt->base.clear_range = gen8_ppgtt_clear_4lvl;
} else {
@@ -1381,6 +1324,7 @@ static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt)
}
}
+ ppgtt->base.allocate_va_range = gen8_ppgtt_alloc_3lvl;
ppgtt->base.insert_entries = gen8_ppgtt_insert_3lvl;
ppgtt->base.clear_range = gen8_ppgtt_clear_3lvl;
}
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index 063e062fad2b..5af5a5d53d93 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -237,8 +237,6 @@ struct i915_page_directory_pointer {
struct i915_pml4 {
struct i915_page_dma base;
-
- DECLARE_BITMAP(used_pml4es, GEN8_PML4ES_PER_PML4);
struct i915_page_directory_pointer *pdps[GEN8_PML4ES_PER_PML4];
};
--
2.11.0
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