[Intel-gfx] [PATCH 3/4] drm/i915/gtt: Recursive ppgtt alloc for gen8
Abdiel Janulgue
abdiel.janulgue at linux.intel.com
Tue Jul 16 15:28:32 UTC 2019
On 12/07/2019 14.27, Chris Wilson wrote:
> Refactor the separate allocation routines into a single recursive
> function.
>
Reviewed-by: Abdiel Janulgue <abdiel.janulgue at linux.intel.com>
> 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 7b2f3188d435..72e0f9799a46 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> @@ -1007,199 +1007,119 @@ 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);
> + goto out;
> + }
> + }
>
> - 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);
> + goto out;
> + }
> + }
>
> - 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 {
> @@ -1496,19 +1416,22 @@ 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;
> @@ -1597,7 +1520,6 @@ 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)) {
> @@ -1606,10 +1528,10 @@ 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))
>
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