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path: root/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
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Diffstat (limited to 'drivers/gpu/drm/i915/gt/gen8_ppgtt.c')
-rw-r--r--drivers/gpu/drm/i915/gt/gen8_ppgtt.c994
1 files changed, 994 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
new file mode 100644
index 000000000..2128b7a72
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
@@ -0,0 +1,994 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2020 Intel Corporation
+ */
+
+#include <linux/log2.h>
+
+#include "gem/i915_gem_lmem.h"
+
+#include "gen8_ppgtt.h"
+#include "i915_scatterlist.h"
+#include "i915_trace.h"
+#include "i915_pvinfo.h"
+#include "i915_vgpu.h"
+#include "intel_gt.h"
+#include "intel_gtt.h"
+
+static u64 gen8_pde_encode(const dma_addr_t addr,
+ const enum i915_cache_level level)
+{
+ u64 pde = addr | GEN8_PAGE_PRESENT | GEN8_PAGE_RW;
+
+ if (level != I915_CACHE_NONE)
+ pde |= PPAT_CACHED_PDE;
+ else
+ pde |= PPAT_UNCACHED;
+
+ return pde;
+}
+
+static u64 gen8_pte_encode(dma_addr_t addr,
+ enum i915_cache_level level,
+ u32 flags)
+{
+ gen8_pte_t pte = addr | GEN8_PAGE_PRESENT | GEN8_PAGE_RW;
+
+ if (unlikely(flags & PTE_READ_ONLY))
+ pte &= ~GEN8_PAGE_RW;
+
+ if (flags & PTE_LM)
+ pte |= GEN12_PPGTT_PTE_LM;
+
+ switch (level) {
+ case I915_CACHE_NONE:
+ pte |= PPAT_UNCACHED;
+ break;
+ case I915_CACHE_WT:
+ pte |= PPAT_DISPLAY_ELLC;
+ break;
+ default:
+ pte |= PPAT_CACHED;
+ break;
+ }
+
+ return pte;
+}
+
+static void gen8_ppgtt_notify_vgt(struct i915_ppgtt *ppgtt, bool create)
+{
+ struct drm_i915_private *i915 = ppgtt->vm.i915;
+ struct intel_uncore *uncore = ppgtt->vm.gt->uncore;
+ enum vgt_g2v_type msg;
+ int i;
+
+ if (create)
+ atomic_inc(px_used(ppgtt->pd)); /* never remove */
+ else
+ atomic_dec(px_used(ppgtt->pd));
+
+ mutex_lock(&i915->vgpu.lock);
+
+ if (i915_vm_is_4lvl(&ppgtt->vm)) {
+ const u64 daddr = px_dma(ppgtt->pd);
+
+ intel_uncore_write(uncore,
+ vgtif_reg(pdp[0].lo), lower_32_bits(daddr));
+ intel_uncore_write(uncore,
+ vgtif_reg(pdp[0].hi), upper_32_bits(daddr));
+
+ msg = create ?
+ VGT_G2V_PPGTT_L4_PAGE_TABLE_CREATE :
+ VGT_G2V_PPGTT_L4_PAGE_TABLE_DESTROY;
+ } else {
+ for (i = 0; i < GEN8_3LVL_PDPES; i++) {
+ const u64 daddr = i915_page_dir_dma_addr(ppgtt, i);
+
+ intel_uncore_write(uncore,
+ vgtif_reg(pdp[i].lo),
+ lower_32_bits(daddr));
+ intel_uncore_write(uncore,
+ vgtif_reg(pdp[i].hi),
+ upper_32_bits(daddr));
+ }
+
+ msg = create ?
+ VGT_G2V_PPGTT_L3_PAGE_TABLE_CREATE :
+ VGT_G2V_PPGTT_L3_PAGE_TABLE_DESTROY;
+ }
+
+ /* g2v_notify atomically (via hv trap) consumes the message packet. */
+ intel_uncore_write(uncore, vgtif_reg(g2v_notify), msg);
+
+ mutex_unlock(&i915->vgpu.lock);
+}
+
+/* Index shifts into the pagetable are offset by GEN8_PTE_SHIFT [12] */
+#define GEN8_PAGE_SIZE (SZ_4K) /* page and page-directory sizes are the same */
+#define GEN8_PTE_SHIFT (ilog2(GEN8_PAGE_SIZE))
+#define GEN8_PDES (GEN8_PAGE_SIZE / sizeof(u64))
+#define gen8_pd_shift(lvl) ((lvl) * ilog2(GEN8_PDES))
+#define gen8_pd_index(i, lvl) i915_pde_index((i), gen8_pd_shift(lvl))
+#define __gen8_pte_shift(lvl) (GEN8_PTE_SHIFT + gen8_pd_shift(lvl))
+#define __gen8_pte_index(a, lvl) i915_pde_index((a), __gen8_pte_shift(lvl))
+
+#define as_pd(x) container_of((x), typeof(struct i915_page_directory), pt)
+
+static unsigned int
+gen8_pd_range(u64 start, u64 end, int lvl, unsigned int *idx)
+{
+ const int shift = gen8_pd_shift(lvl);
+ const u64 mask = ~0ull << gen8_pd_shift(lvl + 1);
+
+ GEM_BUG_ON(start >= end);
+ end += ~mask >> gen8_pd_shift(1);
+
+ *idx = i915_pde_index(start, shift);
+ if ((start ^ end) & mask)
+ return GEN8_PDES - *idx;
+ else
+ return i915_pde_index(end, shift) - *idx;
+}
+
+static bool gen8_pd_contains(u64 start, u64 end, int lvl)
+{
+ const u64 mask = ~0ull << gen8_pd_shift(lvl + 1);
+
+ GEM_BUG_ON(start >= end);
+ return (start ^ end) & mask && (start & ~mask) == 0;
+}
+
+static unsigned int gen8_pt_count(u64 start, u64 end)
+{
+ GEM_BUG_ON(start >= end);
+ if ((start ^ end) >> gen8_pd_shift(1))
+ return GEN8_PDES - (start & (GEN8_PDES - 1));
+ else
+ return end - start;
+}
+
+static unsigned int gen8_pd_top_count(const struct i915_address_space *vm)
+{
+ unsigned int shift = __gen8_pte_shift(vm->top);
+
+ return (vm->total + (1ull << shift) - 1) >> shift;
+}
+
+static struct i915_page_directory *
+gen8_pdp_for_page_index(struct i915_address_space * const vm, const u64 idx)
+{
+ struct i915_ppgtt * const ppgtt = i915_vm_to_ppgtt(vm);
+
+ if (vm->top == 2)
+ return ppgtt->pd;
+ else
+ return i915_pd_entry(ppgtt->pd, gen8_pd_index(idx, vm->top));
+}
+
+static struct i915_page_directory *
+gen8_pdp_for_page_address(struct i915_address_space * const vm, const u64 addr)
+{
+ return gen8_pdp_for_page_index(vm, addr >> GEN8_PTE_SHIFT);
+}
+
+static void __gen8_ppgtt_cleanup(struct i915_address_space *vm,
+ struct i915_page_directory *pd,
+ int count, int lvl)
+{
+ if (lvl) {
+ void **pde = pd->entry;
+
+ do {
+ if (!*pde)
+ continue;
+
+ __gen8_ppgtt_cleanup(vm, *pde, GEN8_PDES, lvl - 1);
+ } while (pde++, --count);
+ }
+
+ free_px(vm, &pd->pt, lvl);
+}
+
+static void gen8_ppgtt_cleanup(struct i915_address_space *vm)
+{
+ struct i915_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
+
+ if (intel_vgpu_active(vm->i915))
+ gen8_ppgtt_notify_vgt(ppgtt, false);
+
+ if (ppgtt->pd)
+ __gen8_ppgtt_cleanup(vm, ppgtt->pd,
+ gen8_pd_top_count(vm), vm->top);
+
+ free_scratch(vm);
+}
+
+static u64 __gen8_ppgtt_clear(struct i915_address_space * const vm,
+ struct i915_page_directory * const pd,
+ u64 start, const u64 end, int lvl)
+{
+ const struct drm_i915_gem_object * const scratch = vm->scratch[lvl];
+ unsigned int idx, len;
+
+ GEM_BUG_ON(end > vm->total >> GEN8_PTE_SHIFT);
+
+ 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 || len >= atomic_read(px_used(pd)));
+
+ do {
+ struct i915_page_table *pt = pd->entry[idx];
+
+ if (atomic_fetch_inc(&pt->used) >> gen8_pd_shift(1) &&
+ gen8_pd_contains(start, end, lvl)) {
+ DBG("%s(%p):{ lvl:%d, idx:%d, start:%llx, end:%llx } removing pd\n",
+ __func__, vm, lvl + 1, idx, start, end);
+ clear_pd_entry(pd, idx, scratch);
+ __gen8_ppgtt_cleanup(vm, as_pd(pt), I915_PDES, lvl);
+ start += (u64)I915_PDES << gen8_pd_shift(lvl);
+ continue;
+ }
+
+ if (lvl) {
+ start = __gen8_ppgtt_clear(vm, as_pd(pt),
+ start, end, lvl);
+ } else {
+ unsigned int count;
+ unsigned int pte = gen8_pd_index(start, 0);
+ unsigned int num_ptes;
+ u64 *vaddr;
+
+ count = gen8_pt_count(start, end);
+ DBG("%s(%p):{ lvl:%d, start:%llx, end:%llx, idx:%d, len:%d, used:%d } removing pte\n",
+ __func__, vm, lvl, start, end,
+ gen8_pd_index(start, 0), count,
+ atomic_read(&pt->used));
+ GEM_BUG_ON(!count || count >= atomic_read(&pt->used));
+
+ num_ptes = count;
+ if (pt->is_compact) {
+ GEM_BUG_ON(num_ptes % 16);
+ GEM_BUG_ON(pte % 16);
+ num_ptes /= 16;
+ pte /= 16;
+ }
+
+ vaddr = px_vaddr(pt);
+ memset64(vaddr + pte,
+ vm->scratch[0]->encode,
+ num_ptes);
+
+ atomic_sub(count, &pt->used);
+ start += count;
+ }
+
+ if (release_pd_entry(pd, idx, pt, scratch))
+ free_px(vm, pt, lvl);
+ } while (idx++, --len);
+
+ return start;
+}
+
+static void gen8_ppgtt_clear(struct i915_address_space *vm,
+ 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)));
+ GEM_BUG_ON(range_overflows(start, length, vm->total));
+
+ start >>= GEN8_PTE_SHIFT;
+ length >>= GEN8_PTE_SHIFT;
+ GEM_BUG_ON(length == 0);
+
+ __gen8_ppgtt_clear(vm, i915_vm_to_ppgtt(vm)->pd,
+ start, start + length, vm->top);
+}
+
+static void __gen8_ppgtt_alloc(struct i915_address_space * const vm,
+ struct i915_vm_pt_stash *stash,
+ struct i915_page_directory * const pd,
+ u64 * const start, const u64 end, int lvl)
+{
+ unsigned int idx, len;
+
+ GEM_BUG_ON(end > vm->total >> GEN8_PTE_SHIFT);
+
+ 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);
+ 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);
+
+ DBG("%s(%p):{ lvl:%d, idx:%d } allocating new tree\n",
+ __func__, vm, lvl + 1, idx);
+
+ pt = stash->pt[!!lvl];
+ __i915_gem_object_pin_pages(pt->base);
+
+ fill_px(pt, vm->scratch[lvl]->encode);
+
+ spin_lock(&pd->lock);
+ if (likely(!pd->entry[idx])) {
+ stash->pt[!!lvl] = pt->stash;
+ atomic_set(&pt->used, 0);
+ set_pd_entry(pd, idx, pt);
+ } else {
+ pt = pd->entry[idx];
+ }
+ }
+
+ if (lvl) {
+ atomic_inc(&pt->used);
+ spin_unlock(&pd->lock);
+
+ __gen8_ppgtt_alloc(vm, stash,
+ as_pd(pt), start, end, lvl);
+
+ spin_lock(&pd->lock);
+ atomic_dec(&pt->used);
+ GEM_BUG_ON(!atomic_read(&pt->used));
+ } else {
+ unsigned int count = gen8_pt_count(*start, end);
+
+ 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));
+
+ atomic_add(count, &pt->used);
+ /* All other pdes may be simultaneously removed */
+ GEM_BUG_ON(atomic_read(&pt->used) > NALLOC * I915_PDES);
+ *start += count;
+ }
+ } while (idx++, --len);
+ spin_unlock(&pd->lock);
+}
+
+static void gen8_ppgtt_alloc(struct i915_address_space *vm,
+ struct i915_vm_pt_stash *stash,
+ 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)));
+ GEM_BUG_ON(range_overflows(start, length, vm->total));
+
+ start >>= GEN8_PTE_SHIFT;
+ length >>= GEN8_PTE_SHIFT;
+ GEM_BUG_ON(length == 0);
+
+ __gen8_ppgtt_alloc(vm, stash, i915_vm_to_ppgtt(vm)->pd,
+ &start, start + length, vm->top);
+}
+
+static void __gen8_ppgtt_foreach(struct i915_address_space *vm,
+ struct i915_page_directory *pd,
+ u64 *start, u64 end, int lvl,
+ void (*fn)(struct i915_address_space *vm,
+ struct i915_page_table *pt,
+ void *data),
+ void *data)
+{
+ unsigned int idx, len;
+
+ len = gen8_pd_range(*start, end, lvl--, &idx);
+
+ spin_lock(&pd->lock);
+ do {
+ struct i915_page_table *pt = pd->entry[idx];
+
+ atomic_inc(&pt->used);
+ spin_unlock(&pd->lock);
+
+ if (lvl) {
+ __gen8_ppgtt_foreach(vm, as_pd(pt), start, end, lvl,
+ fn, data);
+ } else {
+ fn(vm, pt, data);
+ *start += gen8_pt_count(*start, end);
+ }
+
+ spin_lock(&pd->lock);
+ atomic_dec(&pt->used);
+ } while (idx++, --len);
+ spin_unlock(&pd->lock);
+}
+
+static void gen8_ppgtt_foreach(struct i915_address_space *vm,
+ u64 start, u64 length,
+ void (*fn)(struct i915_address_space *vm,
+ struct i915_page_table *pt,
+ void *data),
+ void *data)
+{
+ start >>= GEN8_PTE_SHIFT;
+ length >>= GEN8_PTE_SHIFT;
+
+ __gen8_ppgtt_foreach(vm, i915_vm_to_ppgtt(vm)->pd,
+ &start, start + length, vm->top,
+ fn, data);
+}
+
+static __always_inline u64
+gen8_ppgtt_insert_pte(struct i915_ppgtt *ppgtt,
+ struct i915_page_directory *pdp,
+ struct sgt_dma *iter,
+ u64 idx,
+ enum i915_cache_level cache_level,
+ u32 flags)
+{
+ struct i915_page_directory *pd;
+ const gen8_pte_t pte_encode = gen8_pte_encode(0, cache_level, flags);
+ gen8_pte_t *vaddr;
+
+ pd = i915_pd_entry(pdp, gen8_pd_index(idx, 2));
+ vaddr = px_vaddr(i915_pt_entry(pd, gen8_pd_index(idx, 1)));
+ do {
+ GEM_BUG_ON(sg_dma_len(iter->sg) < I915_GTT_PAGE_SIZE);
+ vaddr[gen8_pd_index(idx, 0)] = pte_encode | iter->dma;
+
+ iter->dma += I915_GTT_PAGE_SIZE;
+ if (iter->dma >= iter->max) {
+ iter->sg = __sg_next(iter->sg);
+ if (!iter->sg || sg_dma_len(iter->sg) == 0) {
+ idx = 0;
+ break;
+ }
+
+ iter->dma = sg_dma_address(iter->sg);
+ iter->max = iter->dma + sg_dma_len(iter->sg);
+ }
+
+ if (gen8_pd_index(++idx, 0) == 0) {
+ if (gen8_pd_index(idx, 1) == 0) {
+ /* Limited by sg length for 3lvl */
+ if (gen8_pd_index(idx, 2) == 0)
+ break;
+
+ pd = pdp->entry[gen8_pd_index(idx, 2)];
+ }
+
+ drm_clflush_virt_range(vaddr, PAGE_SIZE);
+ vaddr = px_vaddr(i915_pt_entry(pd, gen8_pd_index(idx, 1)));
+ }
+ } while (1);
+ drm_clflush_virt_range(vaddr, PAGE_SIZE);
+
+ return idx;
+}
+
+static void
+xehpsdv_ppgtt_insert_huge(struct i915_address_space *vm,
+ struct i915_vma_resource *vma_res,
+ struct sgt_dma *iter,
+ enum i915_cache_level cache_level,
+ u32 flags)
+{
+ const gen8_pte_t pte_encode = vm->pte_encode(0, cache_level, flags);
+ unsigned int rem = sg_dma_len(iter->sg);
+ u64 start = vma_res->start;
+
+ GEM_BUG_ON(!i915_vm_is_4lvl(vm));
+
+ do {
+ struct i915_page_directory * const pdp =
+ gen8_pdp_for_page_address(vm, start);
+ struct i915_page_directory * const pd =
+ i915_pd_entry(pdp, __gen8_pte_index(start, 2));
+ struct i915_page_table *pt =
+ i915_pt_entry(pd, __gen8_pte_index(start, 1));
+ gen8_pte_t encode = pte_encode;
+ unsigned int page_size;
+ gen8_pte_t *vaddr;
+ u16 index, max;
+
+ max = I915_PDES;
+
+ if (vma_res->bi.page_sizes.sg & I915_GTT_PAGE_SIZE_2M &&
+ IS_ALIGNED(iter->dma, I915_GTT_PAGE_SIZE_2M) &&
+ rem >= I915_GTT_PAGE_SIZE_2M &&
+ !__gen8_pte_index(start, 0)) {
+ index = __gen8_pte_index(start, 1);
+ encode |= GEN8_PDE_PS_2M;
+ page_size = I915_GTT_PAGE_SIZE_2M;
+
+ vaddr = px_vaddr(pd);
+ } else {
+ if (encode & GEN12_PPGTT_PTE_LM) {
+ GEM_BUG_ON(__gen8_pte_index(start, 0) % 16);
+ GEM_BUG_ON(rem < I915_GTT_PAGE_SIZE_64K);
+ GEM_BUG_ON(!IS_ALIGNED(iter->dma,
+ I915_GTT_PAGE_SIZE_64K));
+
+ index = __gen8_pte_index(start, 0) / 16;
+ page_size = I915_GTT_PAGE_SIZE_64K;
+
+ max /= 16;
+
+ vaddr = px_vaddr(pd);
+ vaddr[__gen8_pte_index(start, 1)] |= GEN12_PDE_64K;
+
+ pt->is_compact = true;
+ } else {
+ GEM_BUG_ON(pt->is_compact);
+ index = __gen8_pte_index(start, 0);
+ page_size = I915_GTT_PAGE_SIZE;
+ }
+
+ vaddr = px_vaddr(pt);
+ }
+
+ do {
+ GEM_BUG_ON(rem < page_size);
+ vaddr[index++] = encode | iter->dma;
+
+ start += page_size;
+ iter->dma += page_size;
+ rem -= page_size;
+ if (iter->dma >= iter->max) {
+ iter->sg = __sg_next(iter->sg);
+ if (!iter->sg)
+ break;
+
+ rem = sg_dma_len(iter->sg);
+ if (!rem)
+ break;
+
+ iter->dma = sg_dma_address(iter->sg);
+ iter->max = iter->dma + rem;
+
+ if (unlikely(!IS_ALIGNED(iter->dma, page_size)))
+ break;
+ }
+ } while (rem >= page_size && index < max);
+
+ vma_res->page_sizes_gtt |= page_size;
+ } while (iter->sg && sg_dma_len(iter->sg));
+}
+
+static void gen8_ppgtt_insert_huge(struct i915_address_space *vm,
+ struct i915_vma_resource *vma_res,
+ struct sgt_dma *iter,
+ enum i915_cache_level cache_level,
+ u32 flags)
+{
+ const gen8_pte_t pte_encode = gen8_pte_encode(0, cache_level, flags);
+ unsigned int rem = sg_dma_len(iter->sg);
+ u64 start = vma_res->start;
+
+ GEM_BUG_ON(!i915_vm_is_4lvl(vm));
+
+ do {
+ struct i915_page_directory * const pdp =
+ gen8_pdp_for_page_address(vm, start);
+ struct i915_page_directory * const pd =
+ i915_pd_entry(pdp, __gen8_pte_index(start, 2));
+ gen8_pte_t encode = pte_encode;
+ unsigned int maybe_64K = -1;
+ unsigned int page_size;
+ gen8_pte_t *vaddr;
+ u16 index;
+
+ if (vma_res->bi.page_sizes.sg & I915_GTT_PAGE_SIZE_2M &&
+ IS_ALIGNED(iter->dma, I915_GTT_PAGE_SIZE_2M) &&
+ rem >= I915_GTT_PAGE_SIZE_2M &&
+ !__gen8_pte_index(start, 0)) {
+ index = __gen8_pte_index(start, 1);
+ encode |= GEN8_PDE_PS_2M;
+ page_size = I915_GTT_PAGE_SIZE_2M;
+
+ vaddr = px_vaddr(pd);
+ } else {
+ struct i915_page_table *pt =
+ i915_pt_entry(pd, __gen8_pte_index(start, 1));
+
+ index = __gen8_pte_index(start, 0);
+ page_size = I915_GTT_PAGE_SIZE;
+
+ if (!index &&
+ vma_res->bi.page_sizes.sg & I915_GTT_PAGE_SIZE_64K &&
+ IS_ALIGNED(iter->dma, I915_GTT_PAGE_SIZE_64K) &&
+ (IS_ALIGNED(rem, I915_GTT_PAGE_SIZE_64K) ||
+ rem >= (I915_PDES - index) * I915_GTT_PAGE_SIZE))
+ maybe_64K = __gen8_pte_index(start, 1);
+
+ vaddr = px_vaddr(pt);
+ }
+
+ do {
+ GEM_BUG_ON(sg_dma_len(iter->sg) < page_size);
+ vaddr[index++] = encode | iter->dma;
+
+ start += page_size;
+ iter->dma += page_size;
+ rem -= page_size;
+ if (iter->dma >= iter->max) {
+ iter->sg = __sg_next(iter->sg);
+ if (!iter->sg)
+ break;
+
+ rem = sg_dma_len(iter->sg);
+ if (!rem)
+ break;
+
+ iter->dma = sg_dma_address(iter->sg);
+ iter->max = iter->dma + rem;
+
+ if (maybe_64K != -1 && index < I915_PDES &&
+ !(IS_ALIGNED(iter->dma, I915_GTT_PAGE_SIZE_64K) &&
+ (IS_ALIGNED(rem, I915_GTT_PAGE_SIZE_64K) ||
+ rem >= (I915_PDES - index) * I915_GTT_PAGE_SIZE)))
+ maybe_64K = -1;
+
+ if (unlikely(!IS_ALIGNED(iter->dma, page_size)))
+ break;
+ }
+ } while (rem >= page_size && index < I915_PDES);
+
+ drm_clflush_virt_range(vaddr, PAGE_SIZE);
+
+ /*
+ * Is it safe to mark the 2M block as 64K? -- Either we have
+ * filled whole page-table with 64K entries, or filled part of
+ * it and have reached the end of the sg table and we have
+ * enough padding.
+ */
+ if (maybe_64K != -1 &&
+ (index == I915_PDES ||
+ (i915_vm_has_scratch_64K(vm) &&
+ !iter->sg && IS_ALIGNED(vma_res->start +
+ vma_res->node_size,
+ I915_GTT_PAGE_SIZE_2M)))) {
+ vaddr = px_vaddr(pd);
+ vaddr[maybe_64K] |= GEN8_PDE_IPS_64K;
+ drm_clflush_virt_range(vaddr, PAGE_SIZE);
+ page_size = I915_GTT_PAGE_SIZE_64K;
+
+ /*
+ * We write all 4K page entries, even when using 64K
+ * pages. In order to verify that the HW isn't cheating
+ * by using the 4K PTE instead of the 64K PTE, we want
+ * to remove all the surplus entries. If the HW skipped
+ * the 64K PTE, it will read/write into the scratch page
+ * instead - which we detect as missing results during
+ * selftests.
+ */
+ if (I915_SELFTEST_ONLY(vm->scrub_64K)) {
+ u16 i;
+
+ encode = vm->scratch[0]->encode;
+ vaddr = px_vaddr(i915_pt_entry(pd, maybe_64K));
+
+ for (i = 1; i < index; i += 16)
+ memset64(vaddr + i, encode, 15);
+
+ drm_clflush_virt_range(vaddr, PAGE_SIZE);
+ }
+ }
+
+ vma_res->page_sizes_gtt |= page_size;
+ } while (iter->sg && sg_dma_len(iter->sg));
+}
+
+static void gen8_ppgtt_insert(struct i915_address_space *vm,
+ struct i915_vma_resource *vma_res,
+ enum i915_cache_level cache_level,
+ u32 flags)
+{
+ struct i915_ppgtt * const ppgtt = i915_vm_to_ppgtt(vm);
+ struct sgt_dma iter = sgt_dma(vma_res);
+
+ if (vma_res->bi.page_sizes.sg > I915_GTT_PAGE_SIZE) {
+ if (HAS_64K_PAGES(vm->i915))
+ xehpsdv_ppgtt_insert_huge(vm, vma_res, &iter, cache_level, flags);
+ else
+ gen8_ppgtt_insert_huge(vm, vma_res, &iter, cache_level, flags);
+ } else {
+ u64 idx = vma_res->start >> GEN8_PTE_SHIFT;
+
+ do {
+ struct i915_page_directory * const pdp =
+ gen8_pdp_for_page_index(vm, idx);
+
+ idx = gen8_ppgtt_insert_pte(ppgtt, pdp, &iter, idx,
+ cache_level, flags);
+ } while (idx);
+
+ vma_res->page_sizes_gtt = I915_GTT_PAGE_SIZE;
+ }
+}
+
+static void gen8_ppgtt_insert_entry(struct i915_address_space *vm,
+ dma_addr_t addr,
+ u64 offset,
+ enum i915_cache_level level,
+ u32 flags)
+{
+ u64 idx = offset >> GEN8_PTE_SHIFT;
+ struct i915_page_directory * const pdp =
+ gen8_pdp_for_page_index(vm, idx);
+ struct i915_page_directory *pd =
+ i915_pd_entry(pdp, gen8_pd_index(idx, 2));
+ struct i915_page_table *pt = i915_pt_entry(pd, gen8_pd_index(idx, 1));
+ gen8_pte_t *vaddr;
+
+ GEM_BUG_ON(pt->is_compact);
+
+ vaddr = px_vaddr(pt);
+ vaddr[gen8_pd_index(idx, 0)] = gen8_pte_encode(addr, level, flags);
+ drm_clflush_virt_range(&vaddr[gen8_pd_index(idx, 0)], sizeof(*vaddr));
+}
+
+static void __xehpsdv_ppgtt_insert_entry_lm(struct i915_address_space *vm,
+ dma_addr_t addr,
+ u64 offset,
+ enum i915_cache_level level,
+ u32 flags)
+{
+ u64 idx = offset >> GEN8_PTE_SHIFT;
+ struct i915_page_directory * const pdp =
+ gen8_pdp_for_page_index(vm, idx);
+ struct i915_page_directory *pd =
+ i915_pd_entry(pdp, gen8_pd_index(idx, 2));
+ struct i915_page_table *pt = i915_pt_entry(pd, gen8_pd_index(idx, 1));
+ gen8_pte_t *vaddr;
+
+ GEM_BUG_ON(!IS_ALIGNED(addr, SZ_64K));
+ GEM_BUG_ON(!IS_ALIGNED(offset, SZ_64K));
+
+ if (!pt->is_compact) {
+ vaddr = px_vaddr(pd);
+ vaddr[gen8_pd_index(idx, 1)] |= GEN12_PDE_64K;
+ pt->is_compact = true;
+ }
+
+ vaddr = px_vaddr(pt);
+ vaddr[gen8_pd_index(idx, 0) / 16] = gen8_pte_encode(addr, level, flags);
+}
+
+static void xehpsdv_ppgtt_insert_entry(struct i915_address_space *vm,
+ dma_addr_t addr,
+ u64 offset,
+ enum i915_cache_level level,
+ u32 flags)
+{
+ if (flags & PTE_LM)
+ return __xehpsdv_ppgtt_insert_entry_lm(vm, addr, offset,
+ level, flags);
+
+ return gen8_ppgtt_insert_entry(vm, addr, offset, level, flags);
+}
+
+static int gen8_init_scratch(struct i915_address_space *vm)
+{
+ u32 pte_flags;
+ int ret;
+ int i;
+
+ /*
+ * If everybody agrees to not to write into the scratch page,
+ * we can reuse it for all vm, keeping contexts and processes separate.
+ */
+ if (vm->has_read_only && vm->gt->vm && !i915_is_ggtt(vm->gt->vm)) {
+ struct i915_address_space *clone = vm->gt->vm;
+
+ GEM_BUG_ON(!clone->has_read_only);
+
+ vm->scratch_order = clone->scratch_order;
+ for (i = 0; i <= vm->top; i++)
+ vm->scratch[i] = i915_gem_object_get(clone->scratch[i]);
+
+ return 0;
+ }
+
+ ret = setup_scratch_page(vm);
+ if (ret)
+ return ret;
+
+ pte_flags = vm->has_read_only;
+ if (i915_gem_object_is_lmem(vm->scratch[0]))
+ pte_flags |= PTE_LM;
+
+ vm->scratch[0]->encode =
+ gen8_pte_encode(px_dma(vm->scratch[0]),
+ I915_CACHE_NONE, pte_flags);
+
+ for (i = 1; i <= vm->top; i++) {
+ struct drm_i915_gem_object *obj;
+
+ obj = vm->alloc_pt_dma(vm, I915_GTT_PAGE_SIZE_4K);
+ if (IS_ERR(obj)) {
+ ret = PTR_ERR(obj);
+ goto free_scratch;
+ }
+
+ ret = map_pt_dma(vm, obj);
+ if (ret) {
+ i915_gem_object_put(obj);
+ goto free_scratch;
+ }
+
+ fill_px(obj, vm->scratch[i - 1]->encode);
+ obj->encode = gen8_pde_encode(px_dma(obj), I915_CACHE_NONE);
+
+ vm->scratch[i] = obj;
+ }
+
+ return 0;
+
+free_scratch:
+ while (i--)
+ i915_gem_object_put(vm->scratch[i]);
+ vm->scratch[0] = NULL;
+ return ret;
+}
+
+static int gen8_preallocate_top_level_pdp(struct i915_ppgtt *ppgtt)
+{
+ struct i915_address_space *vm = &ppgtt->vm;
+ struct i915_page_directory *pd = ppgtt->pd;
+ unsigned int idx;
+
+ GEM_BUG_ON(vm->top != 2);
+ GEM_BUG_ON(gen8_pd_top_count(vm) != GEN8_3LVL_PDPES);
+
+ for (idx = 0; idx < GEN8_3LVL_PDPES; idx++) {
+ struct i915_page_directory *pde;
+ int err;
+
+ pde = alloc_pd(vm);
+ if (IS_ERR(pde))
+ return PTR_ERR(pde);
+
+ err = map_pt_dma(vm, pde->pt.base);
+ if (err) {
+ free_pd(vm, pde);
+ return err;
+ }
+
+ fill_px(pde, vm->scratch[1]->encode);
+ set_pd_entry(pd, idx, pde);
+ atomic_inc(px_used(pde)); /* keep pinned */
+ }
+ wmb();
+
+ return 0;
+}
+
+static struct i915_page_directory *
+gen8_alloc_top_pd(struct i915_address_space *vm)
+{
+ const unsigned int count = gen8_pd_top_count(vm);
+ struct i915_page_directory *pd;
+ int err;
+
+ GEM_BUG_ON(count > I915_PDES);
+
+ pd = __alloc_pd(count);
+ if (unlikely(!pd))
+ return ERR_PTR(-ENOMEM);
+
+ pd->pt.base = vm->alloc_pt_dma(vm, I915_GTT_PAGE_SIZE_4K);
+ if (IS_ERR(pd->pt.base)) {
+ err = PTR_ERR(pd->pt.base);
+ pd->pt.base = NULL;
+ goto err_pd;
+ }
+
+ err = map_pt_dma(vm, pd->pt.base);
+ if (err)
+ goto err_pd;
+
+ fill_page_dma(px_base(pd), vm->scratch[vm->top]->encode, count);
+ atomic_inc(px_used(pd)); /* mark as pinned */
+ return pd;
+
+err_pd:
+ free_pd(vm, pd);
+ return ERR_PTR(err);
+}
+
+/*
+ * GEN8 legacy ppgtt programming is accomplished through a max 4 PDP registers
+ * with a net effect resembling a 2-level page table in normal x86 terms. Each
+ * PDP represents 1GB of memory 4 * 512 * 512 * 4096 = 4GB legacy 32b address
+ * space.
+ *
+ */
+struct i915_ppgtt *gen8_ppgtt_create(struct intel_gt *gt,
+ unsigned long lmem_pt_obj_flags)
+{
+ struct i915_page_directory *pd;
+ struct i915_ppgtt *ppgtt;
+ int err;
+
+ ppgtt = kzalloc(sizeof(*ppgtt), GFP_KERNEL);
+ if (!ppgtt)
+ return ERR_PTR(-ENOMEM);
+
+ ppgtt_init(ppgtt, gt, lmem_pt_obj_flags);
+ ppgtt->vm.top = i915_vm_is_4lvl(&ppgtt->vm) ? 3 : 2;
+ ppgtt->vm.pd_shift = ilog2(SZ_4K * SZ_4K / sizeof(gen8_pte_t));
+
+ /*
+ * From bdw, there is hw support for read-only pages in the PPGTT.
+ *
+ * Gen11 has HSDES#:1807136187 unresolved. Disable ro support
+ * for now.
+ *
+ * Gen12 has inherited the same read-only fault issue from gen11.
+ */
+ ppgtt->vm.has_read_only = !IS_GRAPHICS_VER(gt->i915, 11, 12);
+
+ if (HAS_LMEM(gt->i915)) {
+ ppgtt->vm.alloc_pt_dma = alloc_pt_lmem;
+
+ /*
+ * On some platforms the hw has dropped support for 4K GTT pages
+ * when dealing with LMEM, and due to the design of 64K GTT
+ * pages in the hw, we can only mark the *entire* page-table as
+ * operating in 64K GTT mode, since the enable bit is still on
+ * the pde, and not the pte. And since we still need to allow
+ * 4K GTT pages for SMEM objects, we can't have a "normal" 4K
+ * page-table with scratch pointing to LMEM, since that's
+ * undefined from the hw pov. The simplest solution is to just
+ * move the 64K scratch page to SMEM on such platforms and call
+ * it a day, since that should work for all configurations.
+ */
+ if (HAS_64K_PAGES(gt->i915))
+ ppgtt->vm.alloc_scratch_dma = alloc_pt_dma;
+ else
+ ppgtt->vm.alloc_scratch_dma = alloc_pt_lmem;
+ } else {
+ ppgtt->vm.alloc_pt_dma = alloc_pt_dma;
+ ppgtt->vm.alloc_scratch_dma = alloc_pt_dma;
+ }
+
+ ppgtt->vm.pte_encode = gen8_pte_encode;
+
+ ppgtt->vm.bind_async_flags = I915_VMA_LOCAL_BIND;
+ ppgtt->vm.insert_entries = gen8_ppgtt_insert;
+ if (HAS_64K_PAGES(gt->i915))
+ ppgtt->vm.insert_page = xehpsdv_ppgtt_insert_entry;
+ else
+ ppgtt->vm.insert_page = gen8_ppgtt_insert_entry;
+ ppgtt->vm.allocate_va_range = gen8_ppgtt_alloc;
+ ppgtt->vm.clear_range = gen8_ppgtt_clear;
+ ppgtt->vm.foreach = gen8_ppgtt_foreach;
+ ppgtt->vm.cleanup = gen8_ppgtt_cleanup;
+
+ err = gen8_init_scratch(&ppgtt->vm);
+ if (err)
+ goto err_put;
+
+ pd = gen8_alloc_top_pd(&ppgtt->vm);
+ if (IS_ERR(pd)) {
+ err = PTR_ERR(pd);
+ goto err_put;
+ }
+ ppgtt->pd = pd;
+
+ if (!i915_vm_is_4lvl(&ppgtt->vm)) {
+ err = gen8_preallocate_top_level_pdp(ppgtt);
+ if (err)
+ goto err_put;
+ }
+
+ if (intel_vgpu_active(gt->i915))
+ gen8_ppgtt_notify_vgt(ppgtt, true);
+
+ return ppgtt;
+
+err_put:
+ i915_vm_put(&ppgtt->vm);
+ return ERR_PTR(err);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-12 08:12:01 +0000