drm/amdgpu: split VM mappings into smaller operations (v3)

If we can't copy entries from the GTT or fill them with one command split
up the mapping operation into multiple ones.

v2: agd: rebase on upstream
v3: squash in Christian's fix

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 77 insertions, 27 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index b371a60837eb..7b660db36931 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -696,42 +696,32 @@ static int amdgpu_vm_update_ptes(struct amdgpu_device *adev,
  *
  * @adev: amdgpu_device pointer
  * @gtt: GART instance to use for mapping
+ * @gtt_flags: flags as they are used for GTT
  * @vm: requested vm
- * @mapping: mapped range and flags to use for the update
+ * @start: start of mapped range
+ * @last: last mapped entry
+ * @flags: flags for the entries
  * @addr: addr to set the area to
- * @gtt_flags: flags as they are used for GTT
  * @fence: optional resulting fence
  *
- * Fill in the page table entries for @mapping.
+ * Fill in the page table entries between @start and @last.
  * Returns 0 for success, -EINVAL for failure.
- *
- * Object have to be reserved and mutex must be locked!
  */
 static int amdgpu_vm_bo_update_mapping(struct amdgpu_device *adev,
                                        struct amdgpu_gart *gtt,
                                        uint32_t gtt_flags,
                                        struct amdgpu_vm *vm,
-                                       struct amdgpu_bo_va_mapping *mapping,
-                                       uint64_t addr, struct fence **fence)
+                                       uint64_t start, uint64_t last,
+                                       uint32_t flags, uint64_t addr,
+                                       struct fence **fence)
 {
         struct amdgpu_ring *ring = adev->vm_manager.vm_pte_funcs_ring;
         unsigned nptes, ncmds, ndw;
-        uint32_t flags = gtt_flags;
         struct amdgpu_ib *ib;
         struct fence *f = NULL;
         int r;
 
-        /* normally,bo_va->flags only contians READABLE and WIRTEABLE bit go here
-         * but in case of something, we filter the flags in first place
-         */
-        if (!(mapping->flags & AMDGPU_PTE_READABLE))
-                flags &= ~AMDGPU_PTE_READABLE;
-        if (!(mapping->flags & AMDGPU_PTE_WRITEABLE))
-                flags &= ~AMDGPU_PTE_WRITEABLE;
-
-        trace_amdgpu_vm_bo_update(mapping);
-
-        nptes = mapping->it.last - mapping->it.start + 1;
+        nptes = last - start + 1;
 
         /*
          * reserve space for one command every (1 << BLOCK_SIZE)
@@ -773,10 +763,8 @@ static int amdgpu_vm_bo_update_mapping(struct amdgpu_device *adev,
 
         ib->length_dw = 0;
 
-        r = amdgpu_vm_update_ptes(adev, gtt, gtt_flags, vm, ib,
-                                  mapping->it.start, mapping->it.last + 1,
-                                  addr + mapping->offset, flags);
-
+        r = amdgpu_vm_update_ptes(adev, gtt, gtt_flags, vm, ib, start,
+                                  last + 1, addr, flags);
         if (r) {
                 amdgpu_ib_free(adev, ib);
                 kfree(ib);
@@ -807,6 +795,68 @@ error_free:
 }
 
 /**
+ * amdgpu_vm_bo_split_mapping - split a mapping into smaller chunks
+ *
+ * @adev: amdgpu_device pointer
+ * @gtt: GART instance to use for mapping
+ * @vm: requested vm
+ * @mapping: mapped range and flags to use for the update
+ * @addr: addr to set the area to
+ * @gtt_flags: flags as they are used for GTT
+ * @fence: optional resulting fence
+ *
+ * Split the mapping into smaller chunks so that each update fits
+ * into a SDMA IB.
+ * Returns 0 for success, -EINVAL for failure.
+ */
+static int amdgpu_vm_bo_split_mapping(struct amdgpu_device *adev,
+                                      struct amdgpu_gart *gtt,
+                                      uint32_t gtt_flags,
+                                      struct amdgpu_vm *vm,
+                                      struct amdgpu_bo_va_mapping *mapping,
+                                      uint64_t addr, struct fence **fence)
+{
+        const uint64_t max_size = 64ULL * 1024ULL * 1024ULL / AMDGPU_GPU_PAGE_SIZE;
+
+        uint64_t start = mapping->it.start;
+        uint32_t flags = gtt_flags;
+        int r;
+
+        /* normally,bo_va->flags only contians READABLE and WIRTEABLE bit go here
+         * but in case of something, we filter the flags in first place
+         */
+        if (!(mapping->flags & AMDGPU_PTE_READABLE))
+                flags &= ~AMDGPU_PTE_READABLE;
+        if (!(mapping->flags & AMDGPU_PTE_WRITEABLE))
+                flags &= ~AMDGPU_PTE_WRITEABLE;
+
+        trace_amdgpu_vm_bo_update(mapping);
+
+        addr += mapping->offset;
+
+        if (!gtt || ((gtt == &adev->gart) && (flags == gtt_flags)))
+                return amdgpu_vm_bo_update_mapping(adev, gtt, gtt_flags, vm,
+                                                   start, mapping->it.last,
+                                                   flags, addr, fence);
+
+        while (start != mapping->it.last + 1) {
+                uint64_t last;
+
+                last = min((uint64_t)mapping->it.last, start + max_size);
+                r = amdgpu_vm_bo_update_mapping(adev, gtt, gtt_flags, vm,
+                                                start, last, flags, addr,
+                                                fence);
+                if (r)
+                        return r;
+
+                start = last + 1;
+                addr += max_size;
+        }
+
+        return 0;
+}
+
+/**
  * amdgpu_vm_bo_update - update all BO mappings in the vm page table
  *
  * @adev: amdgpu_device pointer
@@ -855,8 +905,8 @@ int amdgpu_vm_bo_update(struct amdgpu_device *adev,
         spin_unlock(&vm->status_lock);
 
         list_for_each_entry(mapping, &bo_va->invalids, list) {
-                r = amdgpu_vm_bo_update_mapping(adev, gtt, flags, vm, mapping, addr,
-                                                &bo_va->last_pt_update);
+                r = amdgpu_vm_bo_split_mapping(adev, gtt, flags, vm, mapping, addr,
+                                               &bo_va->last_pt_update);
                 if (r)
                         return r;
         }
@@ -902,8 +952,8 @@ int amdgpu_vm_clear_freed(struct amdgpu_device *adev,
                         struct amdgpu_bo_va_mapping, list);
                 list_del(&mapping->list);
                 spin_unlock(&vm->freed_lock);
-                r = amdgpu_vm_bo_update_mapping(adev, NULL, 0, vm, mapping,
-                                                0, NULL);
+                r = amdgpu_vm_bo_split_mapping(adev, NULL, 0, vm, mapping,
+                                               0, NULL);
                 kfree(mapping);
                 if (r)
                         return r;