diff options
Diffstat (limited to 'drivers/gpu/drm/i915/gt/intel_ppgtt.c')
| -rw-r--r-- | drivers/gpu/drm/i915/gt/intel_ppgtt.c | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gt/intel_ppgtt.c b/drivers/gpu/drm/i915/gt/intel_ppgtt.c new file mode 100644 index 000000000000..f86f7e68ce5e --- /dev/null +++ b/drivers/gpu/drm/i915/gt/intel_ppgtt.c @@ -0,0 +1,218 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2020 Intel Corporation + */ + +#include <linux/slab.h> + +#include "i915_trace.h" +#include "intel_gtt.h" +#include "gen6_ppgtt.h" +#include "gen8_ppgtt.h" + +struct i915_page_table *alloc_pt(struct i915_address_space *vm) +{ + struct i915_page_table *pt; + + pt = kmalloc(sizeof(*pt), I915_GFP_ALLOW_FAIL); + if (unlikely(!pt)) + return ERR_PTR(-ENOMEM); + + if (unlikely(setup_page_dma(vm, &pt->base))) { + kfree(pt); + return ERR_PTR(-ENOMEM); + } + + atomic_set(&pt->used, 0); + return pt; +} + +struct i915_page_directory *__alloc_pd(size_t sz) +{ + struct i915_page_directory *pd; + + pd = kzalloc(sz, I915_GFP_ALLOW_FAIL); + if (unlikely(!pd)) + return NULL; + + spin_lock_init(&pd->lock); + return pd; +} + +struct i915_page_directory *alloc_pd(struct i915_address_space *vm) +{ + struct i915_page_directory *pd; + + pd = __alloc_pd(sizeof(*pd)); + if (unlikely(!pd)) + return ERR_PTR(-ENOMEM); + + if (unlikely(setup_page_dma(vm, px_base(pd)))) { + kfree(pd); + return ERR_PTR(-ENOMEM); + } + + return pd; +} + +void free_pd(struct i915_address_space *vm, struct i915_page_dma *pd) +{ + cleanup_page_dma(vm, pd); + kfree(pd); +} + +static inline void +write_dma_entry(struct i915_page_dma * const pdma, + const unsigned short idx, + const u64 encoded_entry) +{ + u64 * const vaddr = kmap_atomic(pdma->page); + + vaddr[idx] = encoded_entry; + kunmap_atomic(vaddr); +} + +void +__set_pd_entry(struct i915_page_directory * const pd, + const unsigned short idx, + struct i915_page_dma * const to, + u64 (*encode)(const dma_addr_t, const enum i915_cache_level)) +{ + /* Each thread pre-pins the pd, and we may have a thread per pde. */ + GEM_BUG_ON(atomic_read(px_used(pd)) > NALLOC * ARRAY_SIZE(pd->entry)); + + atomic_inc(px_used(pd)); + pd->entry[idx] = to; + write_dma_entry(px_base(pd), idx, encode(to->daddr, I915_CACHE_LLC)); +} + +void +clear_pd_entry(struct i915_page_directory * const pd, + const unsigned short idx, + const struct i915_page_scratch * const scratch) +{ + GEM_BUG_ON(atomic_read(px_used(pd)) == 0); + + write_dma_entry(px_base(pd), idx, scratch->encode); + pd->entry[idx] = NULL; + atomic_dec(px_used(pd)); +} + +bool +release_pd_entry(struct i915_page_directory * const pd, + const unsigned short idx, + struct i915_page_table * const pt, + const struct i915_page_scratch * const scratch) +{ + bool free = false; + + if (atomic_add_unless(&pt->used, -1, 1)) + return false; + + spin_lock(&pd->lock); + if (atomic_dec_and_test(&pt->used)) { + clear_pd_entry(pd, idx, scratch); + free = true; + } + spin_unlock(&pd->lock); + + return free; +} + +int i915_ppgtt_init_hw(struct intel_gt *gt) +{ + struct drm_i915_private *i915 = gt->i915; + + gtt_write_workarounds(gt); + + if (IS_GEN(i915, 6)) + gen6_ppgtt_enable(gt); + else if (IS_GEN(i915, 7)) + gen7_ppgtt_enable(gt); + + return 0; +} + +static struct i915_ppgtt * +__ppgtt_create(struct intel_gt *gt) +{ + if (INTEL_GEN(gt->i915) < 8) + return gen6_ppgtt_create(gt); + else + return gen8_ppgtt_create(gt); +} + +struct i915_ppgtt *i915_ppgtt_create(struct intel_gt *gt) +{ + struct i915_ppgtt *ppgtt; + + ppgtt = __ppgtt_create(gt); + if (IS_ERR(ppgtt)) + return ppgtt; + + trace_i915_ppgtt_create(&ppgtt->vm); + + return ppgtt; +} + +static int ppgtt_bind_vma(struct i915_vma *vma, + enum i915_cache_level cache_level, + u32 flags) +{ + u32 pte_flags; + int err; + + if (flags & I915_VMA_ALLOC) { + err = vma->vm->allocate_va_range(vma->vm, + vma->node.start, vma->size); + if (err) + return err; + + set_bit(I915_VMA_ALLOC_BIT, __i915_vma_flags(vma)); + } + + /* Applicable to VLV, and gen8+ */ + pte_flags = 0; + if (i915_gem_object_is_readonly(vma->obj)) + pte_flags |= PTE_READ_ONLY; + + GEM_BUG_ON(!test_bit(I915_VMA_ALLOC_BIT, __i915_vma_flags(vma))); + vma->vm->insert_entries(vma->vm, vma, cache_level, pte_flags); + wmb(); + + return 0; +} + +static void ppgtt_unbind_vma(struct i915_vma *vma) +{ + if (test_and_clear_bit(I915_VMA_ALLOC_BIT, __i915_vma_flags(vma))) + vma->vm->clear_range(vma->vm, vma->node.start, vma->size); +} + +int ppgtt_set_pages(struct i915_vma *vma) +{ + GEM_BUG_ON(vma->pages); + + vma->pages = vma->obj->mm.pages; + + vma->page_sizes = vma->obj->mm.page_sizes; + + return 0; +} + +void ppgtt_init(struct i915_ppgtt *ppgtt, struct intel_gt *gt) +{ + struct drm_i915_private *i915 = gt->i915; + + ppgtt->vm.gt = gt; + ppgtt->vm.i915 = i915; + ppgtt->vm.dma = &i915->drm.pdev->dev; + ppgtt->vm.total = BIT_ULL(INTEL_INFO(i915)->ppgtt_size); + + i915_address_space_init(&ppgtt->vm, VM_CLASS_PPGTT); + + ppgtt->vm.vma_ops.bind_vma = ppgtt_bind_vma; + ppgtt->vm.vma_ops.unbind_vma = ppgtt_unbind_vma; + ppgtt->vm.vma_ops.set_pages = ppgtt_set_pages; + ppgtt->vm.vma_ops.clear_pages = clear_pages; +} |