drm/amdgpu: increase hmm range get pages timeout

When application tries to allocate all system memory and cause memory
to swap out. Needs more time for hmm_range_fault to validate the
remaining page for allocation. To be safe, increase timeout value to
1 second for 64MB range.
Signed-off-by: James Zhu <James.Zhu@amd.com>
Acked-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c

@@ -190,8 +190,8 @@ int amdgpu_hmm_range_get_pages(struct mmu_interval_notifier *notifier,
 		pr_debug("hmm range: start = 0x%lx, end = 0x%lx",
 			hmm_range->start, hmm_range->end);
 
-		/* Assuming 128MB takes maximum 1 second to fault page address */
-		timeout = max((hmm_range->end - hmm_range->start) >> 27, 1UL);
+		/* Assuming 64MB takes maximum 1 second to fault page address */
+		timeout = max((hmm_range->end - hmm_range->start) >> 26, 1UL);
 		timeout *= HMM_RANGE_DEFAULT_TIMEOUT;
 		timeout = jiffies + msecs_to_jiffies(timeout);