Two style nit-picks inline. Otherwise the series is
Reviewed-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>
On 2020-01-22 9:03 a.m., Christian König wrote:
Allow partial invalidation on unallocated PDs. This is useful when we
need to silence faults to stop interrupt floods on Vega.
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 23 ++++++++++++++++++-----
1 file changed, 18 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 8119f32ca94d..0f79c17118bf 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1467,9 +1467,8 @@ static int amdgpu_vm_update_ptes(struct amdgpu_vm_update_params *params,
* smaller than the address shift. Go to the next
* child entry and try again.
*/
- if (!amdgpu_vm_pt_descendant(adev, &cursor))
- return -ENOENT;
- continue;
+ if (amdgpu_vm_pt_descendant(adev, &cursor))
+ continue;
} else if (frag >= parent_shift) {
/* If the fragment size is even larger than the parent
* shift we should go up one level and check it again.
@@ -1480,8 +1479,19 @@ static int amdgpu_vm_update_ptes(struct amdgpu_vm_update_params *params,
}
pt = cursor.entry->base.bo;
- if (!pt)
- return -ENOENT;
+ if (!pt) {
+ /* We need all PDs and PTs for mapping something, */
+ if (flags & AMDGPU_PTE_VALID)
+ return -ENOENT;
+
+ /* but unmapping something can happen at a higher
+ * level. */
Nit-pick: This comment would upset checkpatch.pl.
+ if (!amdgpu_vm_pt_ancestor(&cursor))
+ return -EINVAL;
+
+ pt = cursor.entry->base.bo;
+ shift = parent_shift;
+ }
/* Looks good so far, calculate parameters for the update */
incr = (uint64_t)AMDGPU_GPU_PAGE_SIZE << shift;
@@ -1495,6 +1505,9 @@ static int amdgpu_vm_update_ptes(struct amdgpu_vm_update_params *params,
uint64_t upd_end = min(entry_end, frag_end);
unsigned nptes = (upd_end - frag_start) >> shift;
+ /* This can happen when we set higher level PDs to
+ * silent to stop fault floods. */
Same as above.
+ nptes = max(nptes, 1u);
amdgpu_vm_update_flags(params, pt, cursor.level,
pe_start, dst, nptes, incr,
flags | AMDGPU_PTE_FRAG(frag));
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