[PATCH 2/2] drm/amdkfd: fix KFDSVMRangeTest.PartialUnmapSysMemTest fails

[Yifan Zhang]

[ RUN      ] KFDSVMRangeTest.PartialUnmapSysMemTest
/home/yifan/brahma/libhsakmt/tests/kfdtest/src/KFDTestUtil.cpp:245: Failure
Value of: (hsaKmtAllocMemory(m_Node, m_Size, m_Flags, &m_pBuf))
  Actual: 1
Expected: HSAKMT_STATUS_SUCCESS
Which is: 0
/home/yifan/brahma/libhsakmt/tests/kfdtest/src/KFDTestUtil.cpp:248: Failure
Value of: (hsaKmtMapMemoryToGPUNodes(m_pBuf, m_Size, __null, mapFlags, 1, &m_Node))
  Actual: 1
Expected: HSAKMT_STATUS_SUCCESS
Which is: 0
/home/yifan/brahma/libhsakmt/tests/kfdtest/src/KFDTestUtil.cpp:306: Failure
Expected: ((void *)__null) != (ptr), actual: NULL vs NULL
Segmentation fault (core dumped)
[          ] Profile: Full Test
[          ] HW capabilities: 0x9

kernel log:

[  102.029150]  ret_from_fork+0x22/0x30
[  102.029158] ---[ end trace 15c34e782714f9a3 ]---
[ 3613.603598] amdgpu: Address: 0x7f7149ccc000 already allocated by SVM
[ 3613.610620] show_signal_msg: 27 callbacks suppressed

These is race with deferred actions from previous memory map
changes (e.g. munmap).Flush pending deffered work to avoid such case.

Signed-off-by: Yifan Zhang <yifan1.zhang at amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
index 3177c4a0e753..e1c4abb98b35 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
@@ -1261,6 +1261,10 @@ static int kfd_ioctl_alloc_memory_of_gpu(struct file *filep,
 		return -EINVAL;
 
 #if IS_ENABLED(CONFIG_HSA_AMD_SVM)
+	/* Flush pending deferred work to avoid racing with deferred actions
+	 * from previous memory map changes (e.g. munmap).
+	 */
+	svm_range_list_lock_and_flush_work(svms, current->mm);
 	mutex_lock(&svms->lock);
 	if (interval_tree_iter_first(&svms->objects,
 				     args->va_addr >> PAGE_SHIFT,
@@ -1271,6 +1275,7 @@ static int kfd_ioctl_alloc_memory_of_gpu(struct file *filep,
 		return -EADDRINUSE;
 	}
 	mutex_unlock(&svms->lock);
+	mmap_write_unlock(current->mm);
 #endif
 	dev = kfd_device_by_id(args->gpu_id);
 	if (!dev)
-- 
2.25.1