I think it's reasonable to use the hive specific lock for hive specific functions.
The changes is acked-by Shaoyun.liu < Shaoyun.liu@xxxxxxx>
-----Original Message-----
From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of StDenis, Tom
Sent: Monday, January 7, 2019 10:16 AM
To: amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Cc: StDenis, Tom <Tom.StDenis@xxxxxxx>
Subject: [PATCH] add missing mutex lock to amdgpu_get_xgmi_hive() (v2)
v2: Move locks around in other functions so that this function can stand on its own. Also only hold the hive specific lock for add/remove device instead of the driver global lock so you can't add/remove devices in parallel from one hive.
Signed-off-by: Tom St Denis <tom.stdenis@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 2 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c | 36 ++++++++++++++--------
drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.h | 2 +-
3 files changed, 25 insertions(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 39d5d058b2c7..13d8e2ad2f7a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -3525,7 +3525,7 @@ int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
* by different nodes. No point also since the one node already executing
* reset will also reset all the other nodes in the hive.
*/
- hive = amdgpu_get_xgmi_hive(adev);
+ hive = amdgpu_get_xgmi_hive(adev, 0);
if (hive && adev->gmc.xgmi.num_physical_nodes > 1 &&
!mutex_trylock(&hive->hive_lock))
return 0;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
index 8a8bc60cb6b4..ebf50809485f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
@@ -40,26 +40,39 @@ void *amdgpu_xgmi_hive_try_lock(struct amdgpu_hive_info *hive)
return &hive->device_list;
}
-struct amdgpu_hive_info *amdgpu_get_xgmi_hive(struct amdgpu_device *adev)
+struct amdgpu_hive_info *amdgpu_get_xgmi_hive(struct amdgpu_device
+*adev, int lock)
{
int i;
struct amdgpu_hive_info *tmp;
if (!adev->gmc.xgmi.hive_id)
return NULL;
+
+ mutex_lock(&xgmi_mutex);
+
for (i = 0 ; i < hive_count; ++i) {
tmp = &xgmi_hives[i];
- if (tmp->hive_id == adev->gmc.xgmi.hive_id)
+ if (tmp->hive_id == adev->gmc.xgmi.hive_id) {
+ if (lock)
+ mutex_lock(&tmp->hive_lock);
+ mutex_unlock(&xgmi_mutex);
return tmp;
+ }
}
- if (i >= AMDGPU_MAX_XGMI_HIVE)
+ if (i >= AMDGPU_MAX_XGMI_HIVE) {
+ mutex_unlock(&xgmi_mutex);
return NULL;
+ }
/* initialize new hive if not exist */
tmp = &xgmi_hives[hive_count++];
tmp->hive_id = adev->gmc.xgmi.hive_id;
INIT_LIST_HEAD(&tmp->device_list);
mutex_init(&tmp->hive_lock);
+ if (lock)
+ mutex_lock(&tmp->hive_lock);
+
+ mutex_unlock(&xgmi_mutex);
return tmp;
}
@@ -111,8 +124,8 @@ int amdgpu_xgmi_add_device(struct amdgpu_device *adev)
return ret;
}
- mutex_lock(&xgmi_mutex);
- hive = amdgpu_get_xgmi_hive(adev);
+ /* find hive and take lock */
+ hive = amdgpu_get_xgmi_hive(adev, 1);
if (!hive)
goto exit;
@@ -142,8 +155,8 @@ int amdgpu_xgmi_add_device(struct amdgpu_device *adev)
break;
}
+ mutex_unlock(&hive->hive_lock);
exit:
- mutex_unlock(&xgmi_mutex);
return ret;
}
@@ -154,15 +167,12 @@ void amdgpu_xgmi_remove_device(struct amdgpu_device *adev)
if (!adev->gmc.xgmi.supported)
return;
- mutex_lock(&xgmi_mutex);
-
- hive = amdgpu_get_xgmi_hive(adev);
+ hive = amdgpu_get_xgmi_hive(adev, 1);
if (!hive)
- goto exit;
+ return;
if (!(hive->number_devices--))
mutex_destroy(&hive->hive_lock);
-
-exit:
- mutex_unlock(&xgmi_mutex);
+ else
+ mutex_unlock(&hive->hive_lock);
}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.h
index 6151eb9c8ad3..8d7984844174 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.h
@@ -32,7 +32,7 @@ struct amdgpu_hive_info {
struct mutex hive_lock;
};
-struct amdgpu_hive_info *amdgpu_get_xgmi_hive(struct amdgpu_device *adev);
+struct amdgpu_hive_info *amdgpu_get_xgmi_hive(struct amdgpu_device
+*adev, int lock);
int amdgpu_xgmi_update_topology(struct amdgpu_hive_info *hive, struct amdgpu_device *adev); int amdgpu_xgmi_add_device(struct amdgpu_device *adev); void amdgpu_xgmi_remove_device(struct amdgpu_device *adev);
--
2.17.2
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