Re: [PATCH] drm/amdkfd: use vma_lookup() instead of find_vma()

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Am 2022-10-20 um 04:20 schrieb Deming Wang:
Using vma_lookup() verifies the start address is contained in the found
vma.  This results in easier to read the code.

Signed-off-by: Deming Wang <wangdeming@xxxxxxxxxx>

Thank you. This patch is

Reviewed-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>

I squashed it with your earlier patch in kfd_migrate.c and submitted it to our amd-staging-drm-next branch.

Regards,
  Felix


---
  drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 17 ++++++++---------
  1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
index 64fdf63093a0..0100812478b2 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
@@ -1586,8 +1586,8 @@ static int svm_range_validate_and_map(struct mm_struct *mm,
  		unsigned long npages;
  		bool readonly;
- vma = find_vma(mm, addr);
-		if (!vma || addr < vma->vm_start) {
+		vma = vma_lookup(mm, addr);
+		if (!vma) {
  			r = -EFAULT;
  			goto unreserve_out;
  		}
@@ -2542,8 +2542,8 @@ svm_range_get_range_boundaries(struct kfd_process *p, int64_t addr,
  	struct interval_tree_node *node;
  	unsigned long start_limit, end_limit;
- vma = find_vma(p->mm, addr << PAGE_SHIFT);
-	if (!vma || (addr << PAGE_SHIFT) < vma->vm_start) {
+	vma = vma_lookup(p->mm, addr << PAGE_SHIFT);
+	if (!vma) {
  		pr_debug("VMA does not exist in address [0x%llx]\n", addr);
  		return -EFAULT;
  	}
@@ -2871,8 +2871,8 @@ svm_range_restore_pages(struct amdgpu_device *adev, unsigned int pasid,
  	/* __do_munmap removed VMA, return success as we are handling stale
  	 * retry fault.
  	 */
-	vma = find_vma(mm, addr << PAGE_SHIFT);
-	if (!vma || (addr << PAGE_SHIFT) < vma->vm_start) {
+	vma = vma_lookup(mm, addr << PAGE_SHIFT);
+	if (!vma) {
  		pr_debug("address 0x%llx VMA is removed\n", addr);
  		r = 0;
  		goto out_unlock_range;
@@ -3152,9 +3152,8 @@ svm_range_is_valid(struct kfd_process *p, uint64_t start, uint64_t size)
  	start <<= PAGE_SHIFT;
  	end = start + (size << PAGE_SHIFT);
  	do {
-		vma = find_vma(p->mm, start);
-		if (!vma || start < vma->vm_start ||
-		    (vma->vm_flags & device_vma))
+		vma = vma_lookup(p->mm, start);
+		if (!vma || (vma->vm_flags & device_vma))
  			return -EFAULT;
  		start = min(end, vma->vm_end);
  	} while (start < end);



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