Re: [PATCH 3/7] drm/i915/gtt: map the PD up front

Matthew Auld <matthew.auld@xxxxxxxxx> · Mon, 26 Apr 2021 17:18:41 +0100

On 26/04/2021 16:20, Tvrtko Ursulin wrote:

On 26/04/2021 11:18, Matthew Auld wrote:
We need to general our accessor for the page directories and tables from

Generalise?

using the simple kmap_atomic to support local memory, and this setup
must be done on acquisition of the backing storage prior to entering
fence execution contexts. Here we replace the kmap with the object
maping code that for simple single page shmemfs object will return a
plain kmap, that is then kept for the lifetime of the page directory.

How big are the address spaces used for mapping types? On 32-bit?

Do we have a mechanism to free something up if there is address space 
pressure in there and is that a concern if we do not?

It's a concern yes, since while the vma is pinned the mapping remains 
there for the PDs underneath, or at least until the used_count reaches 
zero, at which point we can safely destroy the mapping.

For the 32bit concern, this was brought up in some earlier review[1] 
also. AFAIK the conclusion was just to not care about 32b for modern 
platforms, so platforms with full ppGTT support where this patch 
actually matters the most.

[1] https://patchwork.freedesktop.org/patch/404460/?series=84344&rev=1


Regards,

Tvrtko

v2: (Thomas) Rebase on dma_resv and obj->mm.lock removal.

Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx>
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx>
---
  .../drm/i915/gem/selftests/i915_gem_context.c | 11 +----
  drivers/gpu/drm/i915/gt/gen6_ppgtt.c          | 11 ++---
  drivers/gpu/drm/i915/gt/gen8_ppgtt.c          | 26 ++++------
  drivers/gpu/drm/i915/gt/intel_ggtt.c          |  2 +-
  drivers/gpu/drm/i915/gt/intel_gtt.c           | 48 +++++++++----------
  drivers/gpu/drm/i915/gt/intel_gtt.h           | 11 +++--
  drivers/gpu/drm/i915/gt/intel_ppgtt.c         |  7 ++-
  drivers/gpu/drm/i915/i915_vma.c               |  3 +-
  drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 10 ++--
  drivers/gpu/drm/i915/selftests/i915_perf.c    |  3 +-
  10 files changed, 54 insertions(+), 78 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c 
b/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
index 5fef592390cb..ce70d0a3afb2 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
@@ -1740,7 +1740,6 @@ static int read_from_scratch(struct 
i915_gem_context *ctx,
  static int check_scratch_page(struct i915_gem_context *ctx, u32 *out)
  {
      struct i915_address_space *vm;
-    struct page *page;
      u32 *vaddr;
      int err = 0;
@@ -1748,24 +1747,18 @@ static int check_scratch_page(struct 
i915_gem_context *ctx, u32 *out)
      if (!vm)
          return -ENODEV;
-    page = __px_page(vm->scratch[0]);
-    if (!page) {
+    if (!vm->scratch[0]) {
          pr_err("No scratch page!\n");
          return -EINVAL;
      }
-    vaddr = kmap(page);
-    if (!vaddr) {
-        pr_err("No (mappable) scratch page!\n");
-        return -EINVAL;
-    }
+    vaddr = __px_vaddr(vm->scratch[0]);
      memcpy(out, vaddr, sizeof(*out));
      if (memchr_inv(vaddr, *out, PAGE_SIZE)) {
          pr_err("Inconsistent initial state of scratch page!\n");
          err = -EINVAL;
      }
-    kunmap(page);
      return err;
  }
diff --git a/drivers/gpu/drm/i915/gt/gen6_ppgtt.c 
b/drivers/gpu/drm/i915/gt/gen6_ppgtt.c
index e08dff376339..21b1085769be 100644
--- a/drivers/gpu/drm/i915/gt/gen6_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/gen6_ppgtt.c
@@ -96,9 +96,8 @@ static void gen6_ppgtt_clear_range(struct 
i915_address_space *vm,
           * entries back to scratch.
           */
-        vaddr = kmap_atomic_px(pt);
+        vaddr = px_vaddr(pt);
          memset32(vaddr + pte, scratch_pte, count);
-        kunmap_atomic(vaddr);
          pte = 0;
      }
@@ -120,7 +119,7 @@ static void gen6_ppgtt_insert_entries(struct 
i915_address_space *vm,
      GEM_BUG_ON(!pd->entry[act_pt]);
-    vaddr = kmap_atomic_px(i915_pt_entry(pd, act_pt));
+    vaddr = px_vaddr(i915_pt_entry(pd, act_pt));
      do {
          GEM_BUG_ON(sg_dma_len(iter.sg) < I915_GTT_PAGE_SIZE);
          vaddr[act_pte] = pte_encode | GEN6_PTE_ADDR_ENCODE(iter.dma);
@@ -136,12 +135,10 @@ static void gen6_ppgtt_insert_entries(struct 
i915_address_space *vm,
          }
          if (++act_pte == GEN6_PTES) {
-            kunmap_atomic(vaddr);
-            vaddr = kmap_atomic_px(i915_pt_entry(pd, ++act_pt));
+            vaddr = px_vaddr(i915_pt_entry(pd, ++act_pt));
              act_pte = 0;
          }
      } while (1);
-    kunmap_atomic(vaddr);
      vma->page_sizes.gtt = I915_GTT_PAGE_SIZE;
  }
@@ -235,7 +232,7 @@ static int gen6_ppgtt_init_scratch(struct 
gen6_ppgtt *ppgtt)
          goto err_scratch0;
      }
-    ret = pin_pt_dma(vm, vm->scratch[1]);
+    ret = map_pt_dma(vm, vm->scratch[1]);
      if (ret)
          goto err_scratch1;
diff --git a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c 
b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
index 176c19633412..f83496836f0f 100644
--- a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
@@ -242,11 +242,10 @@ static u64 __gen8_ppgtt_clear(struct 
i915_address_space * const vm,
                  atomic_read(&pt->used));
              GEM_BUG_ON(!count || count >= atomic_read(&pt->used));
-            vaddr = kmap_atomic_px(pt);
+            vaddr = px_vaddr(pt);
              memset64(vaddr + gen8_pd_index(start, 0),
                   vm->scratch[0]->encode,
                   count);
-            kunmap_atomic(vaddr);
              atomic_sub(count, &pt->used);
              start += count;
@@ -375,7 +374,7 @@ gen8_ppgtt_insert_pte(struct i915_ppgtt *ppgtt,
      gen8_pte_t *vaddr;
      pd = i915_pd_entry(pdp, gen8_pd_index(idx, 2));
-    vaddr = kmap_atomic_px(i915_pt_entry(pd, gen8_pd_index(idx, 1)));
+    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;
@@ -402,12 +401,10 @@ gen8_ppgtt_insert_pte(struct i915_ppgtt *ppgtt,
              }
              clflush_cache_range(vaddr, PAGE_SIZE);
-            kunmap_atomic(vaddr);
-            vaddr = kmap_atomic_px(i915_pt_entry(pd, 
gen8_pd_index(idx, 1)));
+            vaddr = px_vaddr(i915_pt_entry(pd, gen8_pd_index(idx, 1)));
          }
      } while (1);
      clflush_cache_range(vaddr, PAGE_SIZE);
-    kunmap_atomic(vaddr);
      return idx;
  }
@@ -442,7 +439,7 @@ static void gen8_ppgtt_insert_huge(struct i915_vma 
*vma,
              encode |= GEN8_PDE_PS_2M;
              page_size = I915_GTT_PAGE_SIZE_2M;
-            vaddr = kmap_atomic_px(pd);
+            vaddr = px_vaddr(pd);
          } else {
              struct i915_page_table *pt =
                  i915_pt_entry(pd, __gen8_pte_index(start, 1));
@@ -457,7 +454,7 @@ static void gen8_ppgtt_insert_huge(struct i915_vma 
*vma,
                   rem >= (I915_PDES - index) * I915_GTT_PAGE_SIZE))
                  maybe_64K = __gen8_pte_index(start, 1);
-            vaddr = kmap_atomic_px(pt);
+            vaddr = px_vaddr(pt);
          }
          do {
@@ -491,7 +488,6 @@ static void gen8_ppgtt_insert_huge(struct i915_vma 
*vma,
          } while (rem >= page_size && index < I915_PDES);
          clflush_cache_range(vaddr, PAGE_SIZE);
-        kunmap_atomic(vaddr);
          /*
           * Is it safe to mark the 2M block as 64K? -- Either we have
@@ -505,9 +501,8 @@ static void gen8_ppgtt_insert_huge(struct i915_vma 
*vma,
                !iter->sg && IS_ALIGNED(vma->node.start +
                            vma->node.size,
                            I915_GTT_PAGE_SIZE_2M)))) {
-            vaddr = kmap_atomic_px(pd);
+            vaddr = px_vaddr(pd);
              vaddr[maybe_64K] |= GEN8_PDE_IPS_64K;
-            kunmap_atomic(vaddr);
              page_size = I915_GTT_PAGE_SIZE_64K;
              /*
@@ -523,12 +518,11 @@ static void gen8_ppgtt_insert_huge(struct 
i915_vma *vma,
                  u16 i;
                  encode = vma->vm->scratch[0]->encode;
-                vaddr = kmap_atomic_px(i915_pt_entry(pd, maybe_64K));
+                vaddr = px_vaddr(i915_pt_entry(pd, maybe_64K));
                  for (i = 1; i < index; i += 16)
                      memset64(vaddr + i, encode, 15);
-                kunmap_atomic(vaddr);
              }
          }
@@ -602,7 +596,7 @@ static int gen8_init_scratch(struct 
i915_address_space *vm)
          if (IS_ERR(obj))
              goto free_scratch;
-        ret = pin_pt_dma(vm, obj);
+        ret = map_pt_dma(vm, obj);
          if (ret) {
              i915_gem_object_put(obj);
              goto free_scratch;
@@ -639,7 +633,7 @@ static int gen8_preallocate_top_level_pdp(struct 
i915_ppgtt *ppgtt)
          if (IS_ERR(pde))
              return PTR_ERR(pde);
-        err = pin_pt_dma(vm, pde->pt.base);
+        err = map_pt_dma(vm, pde->pt.base);
          if (err) {
              i915_gem_object_put(pde->pt.base);
              free_pd(vm, pde);
@@ -675,7 +669,7 @@ gen8_alloc_top_pd(struct i915_address_space *vm)
          goto err_pd;
      }
-    err = pin_pt_dma(vm, pd->pt.base);
+    err = map_pt_dma(vm, pd->pt.base);
      if (err)
          goto err_pd;
diff --git a/drivers/gpu/drm/i915/gt/intel_ggtt.c 
b/drivers/gpu/drm/i915/gt/intel_ggtt.c
index 670c1271e7d5..d94628b9d89e 100644
--- a/drivers/gpu/drm/i915/gt/intel_ggtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_ggtt.c
@@ -657,7 +657,7 @@ static int init_aliasing_ppgtt(struct i915_ggtt 
*ggtt)
          goto err_ppgtt;
      i915_gem_object_lock(ppgtt->vm.scratch[0], NULL);
-    err = i915_vm_pin_pt_stash(&ppgtt->vm, &stash);
+    err = i915_vm_map_pt_stash(&ppgtt->vm, &stash);
      i915_gem_object_unlock(ppgtt->vm.scratch[0]);
      if (err)
          goto err_stash;
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.c 
b/drivers/gpu/drm/i915/gt/intel_gtt.c
index 941f8af016d6..d386b89e2758 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.c
@@ -25,27 +25,25 @@ struct drm_i915_gem_object *alloc_pt_dma(struct 
i915_address_space *vm, int sz)
      return obj;
  }
-int pin_pt_dma(struct i915_address_space *vm, struct 
drm_i915_gem_object *obj)
+int map_pt_dma(struct i915_address_space *vm, struct 
drm_i915_gem_object *obj)
  {
-    int err;
+    void *vaddr;
-    i915_gem_object_lock(obj, NULL);
-    err = i915_gem_object_pin_pages(obj);
-    i915_gem_object_unlock(obj);
-    if (err)
-        return err;
+    vaddr = i915_gem_object_pin_map_unlocked(obj, I915_MAP_WB);
+    if (IS_ERR(vaddr))
+        return PTR_ERR(vaddr);
      i915_gem_object_make_unshrinkable(obj);
      return 0;
  }
-int pin_pt_dma_locked(struct i915_address_space *vm, struct 
drm_i915_gem_object *obj)
+int map_pt_dma_locked(struct i915_address_space *vm, struct 
drm_i915_gem_object *obj)
  {
-    int err;
+    void *vaddr;
-    err = i915_gem_object_pin_pages(obj);
-    if (err)
-        return err;
+    vaddr = i915_gem_object_pin_map(obj, I915_MAP_WB);
+    if (IS_ERR(vaddr))
+        return PTR_ERR(vaddr);
      i915_gem_object_make_unshrinkable(obj);
      return 0;
@@ -155,6 +153,14 @@ void clear_pages(struct i915_vma *vma)
      memset(&vma->page_sizes, 0, sizeof(vma->page_sizes));
  }
+void *__px_vaddr(struct drm_i915_gem_object *p)
+{
+    enum i915_map_type type;
+
+    GEM_BUG_ON(!i915_gem_object_has_pages(p));
+    return page_unpack_bits(p->mm.mapping, &type);
+}
+
  dma_addr_t __px_dma(struct drm_i915_gem_object *p)
  {
      GEM_BUG_ON(!i915_gem_object_has_pages(p));
@@ -170,32 +176,22 @@ struct page *__px_page(struct 
drm_i915_gem_object *p)
  void
  fill_page_dma(struct drm_i915_gem_object *p, const u64 val, unsigned 
int count)
  {
-    struct page *page = __px_page(p);
-    void *vaddr;
+    void *vaddr = __px_vaddr(p);
-    vaddr = kmap(page);
      memset64(vaddr, val, count);
      clflush_cache_range(vaddr, PAGE_SIZE);
-    kunmap(page);
  }
  static void poison_scratch_page(struct drm_i915_gem_object *scratch)
  {
-    struct sgt_iter sgt;
-    struct page *page;
+    void *vaddr = __px_vaddr(scratch);
      u8 val;
      val = 0;
      if (IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM))
          val = POISON_FREE;
-    for_each_sgt_page(page, sgt, scratch->mm.pages) {
-        void *vaddr;
-
-        vaddr = kmap(page);
-        memset(vaddr, val, PAGE_SIZE);
-        kunmap(page);
-    }
+    memset(vaddr, val, scratch->base.size);
  }
  int setup_scratch_page(struct i915_address_space *vm)
@@ -225,7 +221,7 @@ int setup_scratch_page(struct i915_address_space *vm)
          if (IS_ERR(obj))
              goto skip;
-        if (pin_pt_dma(vm, obj))
+        if (map_pt_dma(vm, obj))
              goto skip_obj;
          /* We need a single contiguous page for our scratch */
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.h 
b/drivers/gpu/drm/i915/gt/intel_gtt.h
index e67e34e17913..40e486704558 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.h
@@ -180,6 +180,9 @@ struct page *__px_page(struct drm_i915_gem_object 
*p);
  dma_addr_t __px_dma(struct drm_i915_gem_object *p);
  #define px_dma(px) (__px_dma(px_base(px)))
+void *__px_vaddr(struct drm_i915_gem_object *p);
+#define px_vaddr(px) (__px_vaddr(px_base(px)))
+
  #define px_pt(px) \
      __px_choose_expr(px, struct i915_page_table *, __x, \
      __px_choose_expr(px, struct i915_page_directory *, &__x->pt, \
@@ -511,8 +514,6 @@ struct i915_ppgtt *i915_ppgtt_create(struct 
intel_gt *gt);
  void i915_ggtt_suspend(struct i915_ggtt *gtt);
  void i915_ggtt_resume(struct i915_ggtt *ggtt);
-#define kmap_atomic_px(px) kmap_atomic(__px_page(px_base(px)))
-
  void
  fill_page_dma(struct drm_i915_gem_object *p, const u64 val, unsigned 
int count);
@@ -530,8 +531,8 @@ struct i915_page_table *alloc_pt(struct 
i915_address_space *vm);
  struct i915_page_directory *alloc_pd(struct i915_address_space *vm);
  struct i915_page_directory *__alloc_pd(int npde);
-int pin_pt_dma(struct i915_address_space *vm, struct 
drm_i915_gem_object *obj);
-int pin_pt_dma_locked(struct i915_address_space *vm, struct 
drm_i915_gem_object *obj);
+int map_pt_dma(struct i915_address_space *vm, struct 
drm_i915_gem_object *obj);
+int map_pt_dma_locked(struct i915_address_space *vm, struct 
drm_i915_gem_object *obj);
  void free_px(struct i915_address_space *vm,
           struct i915_page_table *pt, int lvl);
@@ -578,7 +579,7 @@ void setup_private_pat(struct intel_uncore *uncore);
  int i915_vm_alloc_pt_stash(struct i915_address_space *vm,
                 struct i915_vm_pt_stash *stash,
                 u64 size);
-int i915_vm_pin_pt_stash(struct i915_address_space *vm,
+int i915_vm_map_pt_stash(struct i915_address_space *vm,
               struct i915_vm_pt_stash *stash);
  void i915_vm_free_pt_stash(struct i915_address_space *vm,
                 struct i915_vm_pt_stash *stash);
diff --git a/drivers/gpu/drm/i915/gt/intel_ppgtt.c 
b/drivers/gpu/drm/i915/gt/intel_ppgtt.c
index 014ae8ac4480..4e3d80c2295c 100644
--- a/drivers/gpu/drm/i915/gt/intel_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_ppgtt.c
@@ -87,11 +87,10 @@ write_dma_entry(struct drm_i915_gem_object * const 
pdma,
          const unsigned short idx,
          const u64 encoded_entry)
  {
-    u64 * const vaddr = kmap_atomic(__px_page(pdma));
+    u64 * const vaddr = __px_vaddr(pdma);
      vaddr[idx] = encoded_entry;
      clflush_cache_range(&vaddr[idx], sizeof(u64));
-    kunmap_atomic(vaddr);
  }
  void
@@ -258,7 +257,7 @@ int i915_vm_alloc_pt_stash(struct 
i915_address_space *vm,
      return 0;
  }
-int i915_vm_pin_pt_stash(struct i915_address_space *vm,
+int i915_vm_map_pt_stash(struct i915_address_space *vm,
               struct i915_vm_pt_stash *stash)
  {
      struct i915_page_table *pt;
@@ -266,7 +265,7 @@ int i915_vm_pin_pt_stash(struct i915_address_space 
*vm,
      for (n = 0; n < ARRAY_SIZE(stash->pt); n++) {
          for (pt = stash->pt[n]; pt; pt = pt->stash) {
-            err = pin_pt_dma_locked(vm, pt->base);
+            err = map_pt_dma_locked(vm, pt->base);
              if (err)
                  return err;
          }
diff --git a/drivers/gpu/drm/i915/i915_vma.c 
b/drivers/gpu/drm/i915/i915_vma.c
index 07490db51cdc..eb01899ac6b7 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -905,8 +905,7 @@ int i915_vma_pin_ww(struct i915_vma *vma, struct 
i915_gem_ww_ctx *ww,
              if (err)
                  goto err_fence;
-            err = i915_vm_pin_pt_stash(vma->vm,
-                           &work->stash);
+            err = i915_vm_map_pt_stash(vma->vm, &work->stash);
              if (err)
                  goto err_fence;
          }
diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c 
b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
index 2e4f06eaacc1..e060e455e9f6 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
@@ -186,7 +186,7 @@ static int igt_ppgtt_alloc(void *arg)
          if (err)
              goto err_ppgtt_cleanup;
-        err = i915_vm_pin_pt_stash(&ppgtt->vm, &stash);
+        err = i915_vm_map_pt_stash(&ppgtt->vm, &stash);
          if (err) {
              i915_vm_free_pt_stash(&ppgtt->vm, &stash);
              goto err_ppgtt_cleanup;
@@ -208,7 +208,7 @@ static int igt_ppgtt_alloc(void *arg)
          if (err)
              goto err_ppgtt_cleanup;
-        err = i915_vm_pin_pt_stash(&ppgtt->vm, &stash);
+        err = i915_vm_map_pt_stash(&ppgtt->vm, &stash);
          if (err) {
              i915_vm_free_pt_stash(&ppgtt->vm, &stash);
              goto err_ppgtt_cleanup;
@@ -325,11 +325,10 @@ static int lowlevel_hole(struct 
i915_address_space *vm,
                                 BIT_ULL(size)))
                      goto alloc_vm_end;
-                err = i915_vm_pin_pt_stash(vm, &stash);
+                err = i915_vm_map_pt_stash(vm, &stash);
                  if (!err)
                      vm->allocate_va_range(vm, &stash,
                                    addr, BIT_ULL(size));
-
                  i915_vm_free_pt_stash(vm, &stash);
  alloc_vm_end:
                  if (err == -EDEADLK) {
@@ -1967,10 +1966,9 @@ static int igt_cs_tlb(void *arg)
              if (err)
                  goto end_ww;
-            err = i915_vm_pin_pt_stash(vm, &stash);
+            err = i915_vm_map_pt_stash(vm, &stash);
              if (!err)
                  vm->allocate_va_range(vm, &stash, offset, chunk_size);
-
              i915_vm_free_pt_stash(vm, &stash);
  end_ww:
              if (err == -EDEADLK) {
diff --git a/drivers/gpu/drm/i915/selftests/i915_perf.c 
b/drivers/gpu/drm/i915/selftests/i915_perf.c
index e9d86dab8677..bfb0290967a1 100644
--- a/drivers/gpu/drm/i915/selftests/i915_perf.c
+++ b/drivers/gpu/drm/i915/selftests/i915_perf.c
@@ -307,7 +307,7 @@ static int live_noa_gpr(void *arg)
      }
      /* Poison the ce->vm so we detect writes not to the GGTT 
gt->scratch */
-    scratch = kmap(__px_page(ce->vm->scratch[0]));
+    scratch = __px_vaddr(ce->vm->scratch[0]);
      memset(scratch, POISON_FREE, PAGE_SIZE);
      rq = intel_context_create_request(ce);
@@ -405,7 +405,6 @@ static int live_noa_gpr(void *arg)
  out_rq:
      i915_request_put(rq);
  out_ce:
-    kunmap(__px_page(ce->vm->scratch[0]));
      intel_context_put(ce);
  out:
      stream_destroy(stream);

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