1 files changed, 35 insertions, 15 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c
index a48ea62b12b0..65715cb395d8 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c
@@ -51,6 +51,8 @@
 #include "amdgpu_amdkfd.h"
 #include "amdgpu_hmm.h"
 
+#define MAX_WALK_BYTE	(2UL << 30)
+
 /**
  * amdgpu_hmm_invalidate_gfx - callback to notify about mm change
  *
@@ -163,6 +165,7 @@ int amdgpu_hmm_range_get_pages(struct mmu_interval_notifier *notifier,
 			       struct hmm_range **phmm_range)
 {
 	struct hmm_range *hmm_range;
+	unsigned long end;
 	unsigned long timeout;
 	unsigned long i;
 	unsigned long *pfns;
@@ -184,25 +187,42 @@ int amdgpu_hmm_range_get_pages(struct mmu_interval_notifier *notifier,
 		hmm_range->default_flags |= HMM_PFN_REQ_WRITE;
 	hmm_range->hmm_pfns = pfns;
 	hmm_range->start = start;
-	hmm_range->end = start + npages * PAGE_SIZE;
+	end = start + npages * PAGE_SIZE;
 	hmm_range->dev_private_owner = owner;
 
-	/* Assuming 512MB takes maxmium 1 second to fault page address */
-	timeout = max(npages >> 17, 1ULL) * HMM_RANGE_DEFAULT_TIMEOUT;
-	timeout = jiffies + msecs_to_jiffies(timeout);
+	do {
+		hmm_range->end = min(hmm_range->start + MAX_WALK_BYTE, end);
+
+		pr_debug("hmm range: start = 0x%lx, end = 0x%lx",
+			hmm_range->start, hmm_range->end);
+
+		/* Assuming 512MB takes maxmium 1 second to fault page address */
+		timeout = max((hmm_range->end - hmm_range->start) >> 29, 1UL);
+		timeout *= HMM_RANGE_DEFAULT_TIMEOUT;
+		timeout = jiffies + msecs_to_jiffies(timeout);
 
 retry:
-	hmm_range->notifier_seq = mmu_interval_read_begin(notifier);
-	r = hmm_range_fault(hmm_range);
-	if (unlikely(r)) {
-		/*
-		 * FIXME: This timeout should encompass the retry from
-		 * mmu_interval_read_retry() as well.
-		 */
-		if (r == -EBUSY && !time_after(jiffies, timeout))
-			goto retry;
-		goto out_free_pfns;
-	}
+		hmm_range->notifier_seq = mmu_interval_read_begin(notifier);
+		r = hmm_range_fault(hmm_range);
+		if (unlikely(r)) {
+			/*
+			 * FIXME: This timeout should encompass the retry from
+			 * mmu_interval_read_retry() as well.
+			 */
+			if (r == -EBUSY && !time_after(jiffies, timeout))
+				goto retry;
+			goto out_free_pfns;
+		}
+
+		if (hmm_range->end == end)
+			break;
+		hmm_range->hmm_pfns += MAX_WALK_BYTE >> PAGE_SHIFT;
+		hmm_range->start = hmm_range->end;
+		schedule();
+	} while (hmm_range->end < end);
+
+	hmm_range->start = start;
+	hmm_range->hmm_pfns = pfns;
 
 	/*
 	 * Due to default_flags, all pages are HMM_PFN_VALID or