diff options
| -rw-r--r-- | Documentation/gpu/amdgpu.rst | 9 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c | 28 |
2 files changed, 37 insertions, 0 deletions
diff --git a/Documentation/gpu/amdgpu.rst b/Documentation/gpu/amdgpu.rst index a740e491dfcc..cacfcfad2356 100644 --- a/Documentation/gpu/amdgpu.rst +++ b/Documentation/gpu/amdgpu.rst @@ -70,6 +70,15 @@ Interrupt Handling .. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c :internal: +AMDGPU XGMI Support +=================== + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c + :doc: AMDGPU XGMI Support + +.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c + :internal: + GPU Power/Thermal Controls and Monitoring ========================================= diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c index e48e9394f1e4..d11eba09eadd 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c @@ -40,6 +40,34 @@ void *amdgpu_xgmi_hive_try_lock(struct amdgpu_hive_info *hive) return &hive->device_list; } +/** + * DOC: AMDGPU XGMI Support + * + * XGMI is a high speed interconnect that joins multiple GPU cards + * into a homogeneous memory space that is organized by a collective + * hive ID and individual node IDs, both of which are 64-bit numbers. + * + * The file xgmi_device_id contains the unique per GPU device ID and + * is stored in the /sys/class/drm/card${cardno}/device/ directory. + * + * Inside the device directory a sub-directory 'xgmi_hive_info' is + * created which contains the hive ID and the list of nodes. + * + * The hive ID is stored in: + * /sys/class/drm/card${cardno}/device/xgmi_hive_info/xgmi_hive_id + * + * The node information is stored in numbered directories: + * /sys/class/drm/card${cardno}/device/xgmi_hive_info/node${nodeno}/xgmi_device_id + * + * Each device has their own xgmi_hive_info direction with a mirror + * set of node sub-directories. + * + * The XGMI memory space is built by contiguously adding the power of + * two padded VRAM space from each node to each other. + * + */ + + static ssize_t amdgpu_xgmi_show_hive_id(struct device *dev, struct device_attribute *attr, char *buf) { |