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drm/i915: Remove bitmap tracking for used-pml4
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@chris-wilson.co.uk> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170215084357.19977-15-chris@chris-wilson.co.uk
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e2b763caa6
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c5d092a429
@ -806,7 +806,6 @@ static void gen8_ppgtt_clear_4lvl(struct i915_address_space *vm,
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continue;
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gen8_ppgtt_set_pml4e(pml4, vm->scratch_pdp, pml4e);
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__clear_bit(pml4e, pml4->used_pml4es);
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free_pdp(vm, pdp);
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}
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@ -1027,8 +1026,8 @@ static void gen8_ppgtt_cleanup_4lvl(struct i915_hw_ppgtt *ppgtt)
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{
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int i;
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for_each_set_bit(i, ppgtt->pml4.used_pml4es, GEN8_PML4ES_PER_PML4) {
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if (WARN_ON(!ppgtt->pml4.pdps[i]))
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for (i = 0; i < GEN8_PML4ES_PER_PML4; i++) {
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if (ppgtt->pml4.pdps[i] == ppgtt->base.scratch_pdp)
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continue;
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gen8_ppgtt_cleanup_3lvl(&ppgtt->base, ppgtt->pml4.pdps[i]);
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@ -1082,53 +1081,9 @@ static int gen8_ppgtt_alloc_pd(struct i915_address_space *vm,
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return -ENOMEM;
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}
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/**
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* gen8_ppgtt_alloc_page_dirpointers() - Allocate pdps for VA range.
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* @vm: Master vm structure.
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* @pml4: Page map level 4 for this address range.
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* @start: Starting virtual address to begin allocations.
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* @length: Size of the allocations.
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* @new_pdps: Bitmap set by function with new allocations. Likely used by the
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* caller to free on error.
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*
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* Allocate the required number of page directory pointers. Extremely similar to
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* gen8_ppgtt_alloc_page_directories() and gen8_ppgtt_alloc_pd().
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* The main difference is here we are limited by the pml4 boundary (instead of
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* the page directory pointer).
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*
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* Return: 0 if success; negative error code otherwise.
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*/
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static int
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gen8_ppgtt_alloc_page_dirpointers(struct i915_address_space *vm,
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struct i915_pml4 *pml4,
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uint64_t start,
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uint64_t length)
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{
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struct i915_page_directory_pointer *pdp;
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uint32_t pml4e;
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gen8_for_each_pml4e(pdp, pml4, start, length, pml4e) {
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if (!test_bit(pml4e, pml4->used_pml4es)) {
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pdp = alloc_pdp(vm);
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if (IS_ERR(pdp))
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return PTR_ERR(pdp);
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gen8_initialize_pdp(vm, pdp);
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pml4->pdps[pml4e] = pdp;
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trace_i915_page_directory_pointer_entry_alloc(vm,
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pml4e,
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start,
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GEN8_PML4E_SHIFT);
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}
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}
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return 0;
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}
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static int gen8_alloc_va_range_3lvl(struct i915_address_space *vm,
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struct i915_page_directory_pointer *pdp,
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uint64_t start,
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uint64_t length)
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static int gen8_ppgtt_alloc_pdp(struct i915_address_space *vm,
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struct i915_page_directory_pointer *pdp,
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u64 start, u64 length)
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{
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struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
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struct i915_page_directory *pd;
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@ -1164,58 +1119,46 @@ static int gen8_alloc_va_range_3lvl(struct i915_address_space *vm,
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return -ENOMEM;
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}
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static int gen8_alloc_va_range_4lvl(struct i915_address_space *vm,
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struct i915_pml4 *pml4,
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uint64_t start,
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uint64_t length)
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static int gen8_ppgtt_alloc_3lvl(struct i915_address_space *vm,
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u64 start, u64 length)
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{
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DECLARE_BITMAP(new_pdps, GEN8_PML4ES_PER_PML4);
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return gen8_ppgtt_alloc_pdp(vm,
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&i915_vm_to_ppgtt(vm)->pdp, start, length);
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}
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static int gen8_ppgtt_alloc_4lvl(struct i915_address_space *vm,
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u64 start, u64 length)
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{
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struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
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struct i915_pml4 *pml4 = &ppgtt->pml4;
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struct i915_page_directory_pointer *pdp;
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uint64_t pml4e;
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int ret = 0;
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/* Do the pml4 allocations first, so we don't need to track the newly
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* allocated tables below the pdp */
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bitmap_zero(new_pdps, GEN8_PML4ES_PER_PML4);
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/* The pagedirectory and pagetable allocations are done in the shared 3
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* and 4 level code. Just allocate the pdps.
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*/
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ret = gen8_ppgtt_alloc_page_dirpointers(vm, pml4, start, length);
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if (ret)
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return ret;
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u64 from = start;
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u32 pml4e;
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int ret;
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gen8_for_each_pml4e(pdp, pml4, start, length, pml4e) {
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WARN_ON(!pdp);
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if (pml4->pdps[pml4e] == vm->scratch_pdp) {
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pdp = alloc_pdp(vm);
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if (IS_ERR(pdp))
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goto unwind;
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ret = gen8_alloc_va_range_3lvl(vm, pdp, start, length);
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if (ret)
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goto err_out;
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gen8_initialize_pdp(vm, pdp);
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gen8_ppgtt_set_pml4e(pml4, pdp, pml4e);
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}
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gen8_ppgtt_set_pml4e(pml4, pdp, pml4e);
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ret = gen8_ppgtt_alloc_pdp(vm, pdp, start, length);
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if (unlikely(ret)) {
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gen8_ppgtt_set_pml4e(pml4, vm->scratch_pdp, pml4e);
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free_pdp(vm, pdp);
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goto unwind;
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}
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}
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bitmap_or(pml4->used_pml4es, new_pdps, pml4->used_pml4es,
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GEN8_PML4ES_PER_PML4);
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return 0;
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err_out:
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for_each_set_bit(pml4e, new_pdps, GEN8_PML4ES_PER_PML4)
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gen8_ppgtt_cleanup_3lvl(vm, pml4->pdps[pml4e]);
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return ret;
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}
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static int gen8_alloc_va_range(struct i915_address_space *vm,
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uint64_t start, uint64_t length)
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{
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struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
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if (USES_FULL_48BIT_PPGTT(vm->i915))
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return gen8_alloc_va_range_4lvl(vm, &ppgtt->pml4, start, length);
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else
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return gen8_alloc_va_range_3lvl(vm, &ppgtt->pdp, start, length);
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unwind:
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gen8_ppgtt_clear_4lvl(vm, from, start - from);
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return -ENOMEM;
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}
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static void gen8_dump_pdp(struct i915_hw_ppgtt *ppgtt,
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@ -1289,7 +1232,7 @@ static void gen8_dump_ppgtt(struct i915_hw_ppgtt *ppgtt, struct seq_file *m)
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struct i915_page_directory_pointer *pdp;
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gen8_for_each_pml4e(pdp, pml4, start, length, pml4e) {
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if (!test_bit(pml4e, pml4->used_pml4es))
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if (pml4->pdps[pml4e] == ppgtt->base.scratch_pdp)
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continue;
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seq_printf(m, " PML4E #%llu\n", pml4e);
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@ -1348,7 +1291,6 @@ static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt)
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ppgtt->base.start = 0;
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ppgtt->base.cleanup = gen8_ppgtt_cleanup;
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ppgtt->base.allocate_va_range = gen8_alloc_va_range;
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ppgtt->base.unbind_vma = ppgtt_unbind_vma;
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ppgtt->base.bind_vma = ppgtt_bind_vma;
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ppgtt->debug_dump = gen8_dump_ppgtt;
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@ -1369,6 +1311,7 @@ static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt)
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ppgtt->base.total = 1ULL << 48;
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ppgtt->switch_mm = gen8_48b_mm_switch;
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ppgtt->base.allocate_va_range = gen8_ppgtt_alloc_4lvl;
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ppgtt->base.insert_entries = gen8_ppgtt_insert_4lvl;
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ppgtt->base.clear_range = gen8_ppgtt_clear_4lvl;
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} else {
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@ -1390,6 +1333,7 @@ static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt)
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}
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}
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ppgtt->base.allocate_va_range = gen8_ppgtt_alloc_3lvl;
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ppgtt->base.insert_entries = gen8_ppgtt_insert_3lvl;
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ppgtt->base.clear_range = gen8_ppgtt_clear_3lvl;
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}
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@ -238,8 +238,6 @@ struct i915_page_directory_pointer {
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struct i915_pml4 {
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struct i915_page_dma base;
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DECLARE_BITMAP(used_pml4es, GEN8_PML4ES_PER_PML4);
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struct i915_page_directory_pointer *pdps[GEN8_PML4ES_PER_PML4];
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};
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