drm/amdkfd: use vma_lookup() instead of find_vma()

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@inspur.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdkfd/kfd_migrate.c

@@ -529,8 +529,8 @@ svm_migrate_ram_to_vram(struct svm_range *prange, uint32_t best_loc,
 	for (addr = start; addr < end;) {
 		unsigned long next;
 
-		vma = find_vma(mm, addr);
-		if (!vma || addr < vma->vm_start)
+		vma = vma_lookup(mm, addr);
+		if (!vma)
 			break;
 
 		next = min(vma->vm_end, end);
@@ -798,8 +798,8 @@ int svm_migrate_vram_to_ram(struct svm_range *prange, struct mm_struct *mm,
 	for (addr = start; addr < end;) {
 		unsigned long next;
 
-		vma = find_vma(mm, addr);
-		if (!vma || addr < vma->vm_start) {
+		vma = vma_lookup(mm, addr);
+		if (!vma) {
 			pr_debug("failed to find vma for prange %p\n", prange);
 			r = -EFAULT;
 			break;

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);