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Documentation/amdgpu: Add UMA carveout details

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Add documentation for the uma/carveout_options and uma/carveout
attributes in sysfs

Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Yo-Jung Leo Lin (AMD) <Leo.Lin@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Yo-Jung Leo Lin (AMD)
2025-12-12 15:59:17 +08:00
committed by Alex Deucher
parent 19ba61ac06
commit 5946dbe1c8
2 changed files with 55 additions and 0 deletions
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29
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
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@@ -382,6 +382,24 @@ static const struct attribute_group amdgpu_board_attrs_group = {
.is_visible = amdgpu_board_attrs_is_visible
};
/**
* DOC: uma/carveout_options
*
* This is a read-only file that lists all available UMA allocation
* options and their corresponding indices. Example output::
*
* $ cat uma/carveout_options
* 0: Minimum (512 MB)
* 1: (1 GB)
* 2: (2 GB)
* 3: (4 GB)
* 4: (6 GB)
* 5: (8 GB)
* 6: (12 GB)
* 7: Medium (16 GB)
* 8: (24 GB)
* 9: High (32 GB)
*/
static ssize_t carveout_options_show(struct device *dev,
struct device_attribute *attr,
char *buf)
@@ -414,6 +432,17 @@ static ssize_t carveout_options_show(struct device *dev,
}
static DEVICE_ATTR_RO(carveout_options);
/**
* DOC: uma/carveout
*
* This file is both readable and writable. When read, it shows the
* index of the current setting. Writing a valid index to this file
* allows users to change the UMA carveout size to the selected option
* on the next boot.
*
* The available options and their corresponding indices can be read
* from the uma/carveout_options file.
*/
static ssize_t carveout_show(struct device *dev,
struct device_attribute *attr,
char *buf)