[Intel-gfx] [PATCH 10/11] drm/i915/gtt: Recursive ppgtt alloc for gen8
Chris Wilson
chris at chris-wilson.co.uk
Sun Jul 7 21:00:23 UTC 2019
Refactor the separate allocation routines into a single recursive
function.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_gem_gtt.c | 272 ++++++++++------------------
1 file changed, 97 insertions(+), 175 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index e2d6169a8a66..83f03f8f4d2c 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -1004,199 +1004,119 @@ static void gen8_ppgtt_clear(struct i915_address_space *vm,
start, start + length, vm->top);
}
-static void gen8_ppgtt_clear_pd(struct i915_address_space *vm,
- struct i915_page_directory *pd,
- u64 start, u64 length)
-{
- GEM_BUG_ON(!IS_ALIGNED(start, BIT_ULL(GEN8_PTE_SHIFT)));
- GEM_BUG_ON(!IS_ALIGNED(length, BIT_ULL(GEN8_PTE_SHIFT)));
-
- start >>= GEN8_PTE_SHIFT;
- length >>= GEN8_PTE_SHIFT;
-
- __gen8_ppgtt_clear(vm, pd, start, start + length, 1);
-}
-
-static void gen8_ppgtt_clear_pdp(struct i915_address_space *vm,
- struct i915_page_directory * const pdp,
- u64 start, u64 length)
-{
- GEM_BUG_ON(!IS_ALIGNED(start, BIT_ULL(GEN8_PTE_SHIFT)));
- GEM_BUG_ON(!IS_ALIGNED(length, BIT_ULL(GEN8_PTE_SHIFT)));
-
- start >>= GEN8_PTE_SHIFT;
- length >>= GEN8_PTE_SHIFT;
-
- __gen8_ppgtt_clear(vm, pdp, start, start + length, 2);
-}
-
-static int gen8_ppgtt_alloc_pd(struct i915_address_space *vm,
- struct i915_page_directory *pd,
- u64 start, u64 length)
+static int __gen8_ppgtt_alloc(struct i915_address_space * const vm,
+ struct i915_page_directory * const pd,
+ u64 * const start, u64 end, int lvl)
{
- struct i915_page_table *pt, *alloc = NULL;
- u64 from = start;
- unsigned int pde;
+ const struct i915_page_scratch * const scratch = &vm->scratch[lvl];
+ struct i915_page_table *alloc = NULL;
+ unsigned int idx, len;
int ret = 0;
+ len = gen8_pd_range(*start, end, lvl--, &idx);
+ DBG("%s(%p):{lvl:%d, start:%llx, end:%llx, idx:%d, len:%d, used:%d}\n",
+ __func__, vm, lvl + 1, *start, end,
+ idx, len, atomic_read(px_used(pd)));
+ GEM_BUG_ON(!len || (idx + len - 1) >> gen8_pd_shift(1));
+
spin_lock(&pd->lock);
- gen8_for_each_pde(pt, pd, start, length, pde) {
- const int count = gen8_pte_count(start, length);
+ GEM_BUG_ON(!atomic_read(px_used(pd))); /* Must be pinned! */
+ do {
+ struct i915_page_table *pt = pd->entry[idx];
if (!pt) {
spin_unlock(&pd->lock);
- pt = fetch_and_zero(&alloc);
- if (!pt)
- pt = alloc_pt(vm);
- if (IS_ERR(pt)) {
- ret = PTR_ERR(pt);
- goto unwind;
- }
+ DBG("%s(%p):{ lvl:%d, idx:%d } allocating new tree\n",
+ __func__, vm, lvl + 1, idx);
- if (count < GEN8_PTES || intel_vgpu_active(vm->i915))
- fill_px(pt, vm->scratch[0].encode);
+ pt = fetch_and_zero(&alloc);
+ if (lvl) {
+ if (!pt) {
+ pt = &alloc_pd(vm)->pt;
+ if (IS_ERR(pt)) {
+ ret = PTR_ERR(pt);
+ break;
+ }
+ }
- spin_lock(&pd->lock);
- if (!pd->entry[pde]) {
- set_pd_entry(pd, pde, pt);
+ fill_px(pt, vm->scratch[lvl].encode);
} else {
- alloc = pt;
- pt = pd->entry[pde];
- }
- }
-
- atomic_add(count, &pt->used);
- }
- spin_unlock(&pd->lock);
- goto out;
-
-unwind:
- gen8_ppgtt_clear_pd(vm, pd, from, start - from);
-out:
- if (alloc)
- free_px(vm, alloc);
- return ret;
-}
-
-static int gen8_ppgtt_alloc_pdp(struct i915_address_space *vm,
- struct i915_page_directory *pdp,
- u64 start, u64 length)
-{
- struct i915_page_directory *pd, *alloc = NULL;
- u64 from = start;
- unsigned int pdpe;
- int ret = 0;
+ if (!pt) {
+ pt = alloc_pt(vm);
+ if (IS_ERR(pt)) {
+ ret = PTR_ERR(pt);
+ break;
+ }
+ }
- spin_lock(&pdp->lock);
- gen8_for_each_pdpe(pd, pdp, start, length, pdpe) {
- if (!pd) {
- spin_unlock(&pdp->lock);
-
- pd = fetch_and_zero(&alloc);
- if (!pd)
- pd = alloc_pd(vm);
- if (IS_ERR(pd)) {
- ret = PTR_ERR(pd);
- goto unwind;
+ if (intel_vgpu_active(vm->i915) ||
+ gen8_pt_count(*start, end) < I915_PDES)
+ fill_px(pt, vm->scratch[lvl].encode);
}
- fill_px(pd, vm->scratch[1].encode);
+ spin_lock(&pd->lock);
+ if (likely(!pd->entry[idx]))
+ set_pd_entry(pd, idx, pt);
+ else
+ alloc = pt, pt = pd->entry[idx];
+ }
- spin_lock(&pdp->lock);
- if (!pdp->entry[pdpe]) {
- set_pd_entry(pdp, pdpe, pd);
- } else {
- alloc = pd;
- pd = pdp->entry[pdpe];
+ if (lvl) {
+ atomic_inc(&pt->used);
+ spin_unlock(&pd->lock);
+
+ ret = __gen8_ppgtt_alloc(vm, as_pd(pt),
+ start, end, lvl);
+ if (unlikely(ret)) {
+ if (release_pd_entry(pd, idx, pt, scratch))
+ free_px(vm, pt);
+ goto out;
}
- }
- atomic_inc(px_used(pd));
- spin_unlock(&pdp->lock);
- ret = gen8_ppgtt_alloc_pd(vm, pd, start, length);
- if (unlikely(ret))
- goto unwind_pd;
+ spin_lock(&pd->lock);
+ atomic_dec(&pt->used);
+ GEM_BUG_ON(!atomic_read(&pt->used));
+ } else {
+ unsigned int count = gen8_pt_count(*start, end);
- spin_lock(&pdp->lock);
- atomic_dec(px_used(pd));
- }
- spin_unlock(&pdp->lock);
- goto out;
+ DBG("%s(%p):{lvl:%d, start:%llx, end:%llx, idx:%d, len:%d, used:%d} inserting pte\n",
+ __func__, vm, lvl, *start, end,
+ gen8_pd_index(*start, 0), count,
+ atomic_read(&pt->used));
-unwind_pd:
- if (release_pd_entry(pdp, pdpe, &pd->pt, &vm->scratch[2]))
- free_px(vm, pd);
-unwind:
- gen8_ppgtt_clear_pdp(vm, pdp, from, start - from);
+ atomic_add(count, &pt->used);
+ GEM_BUG_ON(atomic_read(&pt->used) > I915_PDES);
+ *start += count;
+ }
+ } while (idx++, --len);
+ spin_unlock(&pd->lock);
out:
if (alloc)
free_px(vm, alloc);
return ret;
}
-static int gen8_ppgtt_alloc_3lvl(struct i915_address_space *vm,
- u64 start, u64 length)
-{
- return gen8_ppgtt_alloc_pdp(vm,
- i915_vm_to_ppgtt(vm)->pd, start, length);
-}
-
-static int gen8_ppgtt_alloc_4lvl(struct i915_address_space *vm,
- u64 start, u64 length)
+static int gen8_ppgtt_alloc(struct i915_address_space *vm,
+ u64 start, u64 length)
{
- struct i915_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
- struct i915_page_directory * const pml4 = ppgtt->pd;
- struct i915_page_directory *pdp, *alloc = NULL;
u64 from = start;
- int ret = 0;
- u32 pml4e;
-
- spin_lock(&pml4->lock);
- gen8_for_each_pml4e(pdp, pml4, start, length, pml4e) {
- if (!pdp) {
- spin_unlock(&pml4->lock);
-
- pdp = fetch_and_zero(&alloc);
- if (!pdp)
- pdp = alloc_pd(vm);
- if (IS_ERR(pdp)) {
- ret = PTR_ERR(pdp);
- goto unwind;
- }
-
- fill_px(pdp, vm->scratch[2].encode);
+ int err;
- spin_lock(&pml4->lock);
- if (!pml4->entry[pml4e]) {
- set_pd_entry(pml4, pml4e, pdp);
- } else {
- alloc = pdp;
- pdp = pml4->entry[pml4e];
- }
- }
- atomic_inc(px_used(pdp));
- spin_unlock(&pml4->lock);
+ GEM_BUG_ON(!IS_ALIGNED(start, BIT_ULL(GEN8_PTE_SHIFT)));
+ GEM_BUG_ON(!IS_ALIGNED(length, BIT_ULL(GEN8_PTE_SHIFT)));
- ret = gen8_ppgtt_alloc_pdp(vm, pdp, start, length);
- if (unlikely(ret))
- goto unwind_pdp;
+ start >>= GEN8_PTE_SHIFT;
+ length >>= GEN8_PTE_SHIFT;
+ GEM_BUG_ON(length == 0);
- spin_lock(&pml4->lock);
- atomic_dec(px_used(pdp));
- }
- spin_unlock(&pml4->lock);
- goto out;
+ err = __gen8_ppgtt_alloc(vm, i915_vm_to_ppgtt(vm)->pd,
+ &start, start + length, vm->top);
+ if (unlikely(err))
+ __gen8_ppgtt_clear(vm, i915_vm_to_ppgtt(vm)->pd,
+ from, start, vm->top);
-unwind_pdp:
- if (release_pd_entry(pml4, pml4e, &pdp->pt, &vm->scratch[3]))
- free_px(vm, pdp);
-unwind:
- gen8_ppgtt_clear(vm, from, start - from);
-out:
- if (alloc)
- free_px(vm, alloc);
- return ret;
+ return err;
}
static inline struct sgt_dma {
@@ -1493,19 +1413,22 @@ static int gen8_init_scratch(struct i915_address_space *vm)
static int gen8_preallocate_top_level_pdp(struct i915_ppgtt *ppgtt)
{
struct i915_address_space *vm = &ppgtt->vm;
- struct i915_page_directory *pdp = ppgtt->pd;
- struct i915_page_directory *pd;
- u64 start = 0, length = ppgtt->vm.total;
- unsigned int pdpe;
+ struct i915_page_directory *pd = ppgtt->pd;
+ unsigned int idx;
+
+ GEM_BUG_ON(vm->top != 2);
+ GEM_BUG_ON((vm->total >> __gen8_pte_shift(2)) != GEN8_3LVL_PDPES);
+
+ for (idx = 0; idx < GEN8_3LVL_PDPES; idx++) {
+ struct i915_page_directory *pde;
- gen8_for_each_pdpe(pd, pdp, start, length, pdpe) {
- pd = alloc_pd(vm);
- if (IS_ERR(pd))
- return PTR_ERR(pd);
+ pde = alloc_pd(vm);
+ if (IS_ERR(pde))
+ return PTR_ERR(pde);
- fill_px(pd, vm->scratch[1].encode);
- set_pd_entry(pdp, pdpe, pd);
- atomic_inc(px_used(pd)); /* keep pinned */
+ fill_px(pde, vm->scratch[1].encode);
+ set_pd_entry(pd, idx, pde);
+ atomic_inc(px_used(pde)); /* keep pinned */
}
return 0;
@@ -1595,7 +1518,6 @@ static struct i915_ppgtt *gen8_ppgtt_create(struct drm_i915_private *i915)
}
if (i915_vm_is_4lvl(&ppgtt->vm)) {
- ppgtt->vm.allocate_va_range = gen8_ppgtt_alloc_4lvl;
ppgtt->vm.insert_entries = gen8_ppgtt_insert_4lvl;
} else {
if (intel_vgpu_active(i915)) {
@@ -1604,10 +1526,10 @@ static struct i915_ppgtt *gen8_ppgtt_create(struct drm_i915_private *i915)
goto err_free_pd;
}
- ppgtt->vm.allocate_va_range = gen8_ppgtt_alloc_3lvl;
ppgtt->vm.insert_entries = gen8_ppgtt_insert_3lvl;
}
+ ppgtt->vm.allocate_va_range = gen8_ppgtt_alloc;
ppgtt->vm.clear_range = gen8_ppgtt_clear;
if (intel_vgpu_active(i915))
--
2.20.1
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