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drm/amd/doc: Add XGMI sysfs documentation 

Acked-by: Slava Abramov <slava.abramov@amd.com>
Signed-off-by: Tom St Denis <tom.stdenis@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Tom St Denis 2019-05-24 09:15:17 -04:00 committed by Alex Deucher
parent f1e5e91302
commit 1c1e53f7f2
2 changed files with 37 additions and 0 deletions
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9
Documentation/gpu/amdgpu.rst
View File

@ -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
=========================================

28
drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
View File

@ -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)
{