This update adds explanations to key functions related to process isolation and cleaner shader execution sysfs interfaces. - `amdgpu_gfx_set_run_cleaner_shader`: Describes how to manually run a cleaner shader, which clears the Local Data Store (LDS) and General Purpose Registers (GPRs) to ensure data isolation between GPU workloads. - `amdgpu_gfx_get_enforce_isolation`: Describes how to query the current settings of the 'enforce_isolation' feature for each GPU partition. - `amdgpu_gfx_set_enforce_isolation`: Describes how to enable or disable process isolation for GPU partitions through the sysfs interface. Cc: Christian König <christian.koenig@xxxxxxx> Cc: Alex Deucher <alexander.deucher@xxxxxxx> Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@xxxxxxx> Suggested-by: Alex Deucher <alexander.deucher@xxxxxxx> --- v2: - Incorporated feedbacks for function descriptions (Alex) drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c | 45 +++++++++++++++++++++++++ 1 file changed, 45 insertions(+) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c index e54f42e3797e..7e2ad7818903 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c @@ -1484,6 +1484,24 @@ static int amdgpu_gfx_run_cleaner_shader(struct amdgpu_device *adev, int xcp_id) return 0; } +/** + * amdgpu_gfx_set_run_cleaner_shader - Execute the AMDGPU GFX Cleaner Shader + * @dev: The device structure + * @attr: The device attribute structure + * @buf: The buffer containing the input data + * @count: The size of the input data + * + * Provides the sysfs interface to manually run a cleaner shader, which is + * used to clear the GPU state between different tasks. Writing a value to the + * 'run_cleaner_shader' sysfs file triggers the cleaner shader execution. + * The value written corresponds to the partition index on multi-partition + * devices. On single-partition devices, the value should be '0'. + * + * The cleaner shader clears the Local Data Store (LDS) and General Purpose + * Registers (GPRs) to ensure data isolation between GPU workloads. + * + * Return: The number of bytes written to the sysfs file. + */ static ssize_t amdgpu_gfx_set_run_cleaner_shader(struct device *dev, struct device_attribute *attr, const char *buf, @@ -1532,6 +1550,19 @@ static ssize_t amdgpu_gfx_set_run_cleaner_shader(struct device *dev, return count; } +/** + * amdgpu_gfx_get_enforce_isolation - Query AMDGPU GFX Enforce Isolation Settings + * @dev: The device structure + * @attr: The device attribute structure + * @buf: The buffer to store the output data + * + * Provides the sysfs read interface to get the current settings of the 'enforce_isolation' + * feature for each GPU partition. Reading from the 'enforce_isolation' + * sysfs file returns the isolation settings for all partitions, where '0' + * indicates disabled and '1' indicates enabled. + * + * Return: The number of bytes read from the sysfs file. + */ static ssize_t amdgpu_gfx_get_enforce_isolation(struct device *dev, struct device_attribute *attr, char *buf) @@ -1555,6 +1586,20 @@ static ssize_t amdgpu_gfx_get_enforce_isolation(struct device *dev, return size; } +/** + * amdgpu_gfx_set_enforce_isolation - Control AMDGPU GFX Enforce Isolation + * @dev: The device structure + * @attr: The device attribute structure + * @buf: The buffer containing the input data + * @count: The size of the input data + * + * This function allows control over the 'enforce_isolation' feature, which + * serializes access to the graphics engine. Writing '1' or '0' to the + * 'enforce_isolation' sysfs file enables or disables process isolation for + * each partition. The input should specify the setting for all partitions. + * + * Return: The number of bytes written to the sysfs file. + */ static ssize_t amdgpu_gfx_set_enforce_isolation(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) -- 2.34.1
