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drm/amdgpu: Add vbios build number interface

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Fetch VBIOS build number from atom rom image. Add a sysfs interface to
read the build number.

Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Lijo Lazar 2025-08-28 12:50:09 +05:30 committed by Alex Deucher
parent c5f4fb4058
commit d6fa802661
3 changed files with 54 additions and 3 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

33
drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
View file

@ -1816,16 +1816,43 @@ static ssize_t amdgpu_atombios_get_vbios_version(struct device *dev,
return sysfs_emit(buf, "%s\n", ctx->vbios_pn);
}
static ssize_t amdgpu_atombios_get_vbios_build(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct drm_device *ddev = dev_get_drvdata(dev);
struct amdgpu_device *adev = drm_to_adev(ddev);
struct atom_context *ctx = adev->mode_info.atom_context;
return sysfs_emit(buf, "%s\n", ctx->build_num);
}
static DEVICE_ATTR(vbios_version, 0444, amdgpu_atombios_get_vbios_version,
NULL);
static DEVICE_ATTR(vbios_build, 0444, amdgpu_atombios_get_vbios_build, NULL);
static struct attribute *amdgpu_vbios_version_attrs[] = {
&dev_attr_vbios_version.attr,
NULL
&dev_attr_vbios_version.attr, &dev_attr_vbios_build.attr, NULL
};
static umode_t amdgpu_vbios_version_attrs_is_visible(struct kobject *kobj,
struct attribute *attr,
int index)
{
struct device *dev = kobj_to_dev(kobj);
struct drm_device *ddev = dev_get_drvdata(dev);
struct amdgpu_device *adev = drm_to_adev(ddev);
struct atom_context *ctx = adev->mode_info.atom_context;
if (attr == &dev_attr_vbios_build.attr && !strlen(ctx->build_num))
return 0;
return attr->mode;
}
const struct attribute_group amdgpu_vbios_version_attr_group = {
.attrs = amdgpu_vbios_version_attrs
.attrs = amdgpu_vbios_version_attrs,
.is_visible = amdgpu_vbios_version_attrs_is_visible,
};
int amdgpu_atombios_sysfs_init(struct amdgpu_device *adev)

22
drivers/gpu/drm/amd/amdgpu/atom.c
View file

@ -1494,6 +1494,27 @@ static void atom_get_vbios_version(struct atom_context *ctx)
}
}
static void atom_get_vbios_build(struct atom_context *ctx)
{
unsigned char *atom_rom_hdr;
unsigned char *str;
uint16_t base;
base = CU16(ATOM_ROM_TABLE_PTR);
atom_rom_hdr = CSTR(base);
str = CSTR(CU16(base + ATOM_ROM_CFG_PTR));
/* Skip config string */
while (str < atom_rom_hdr && *str++)
;
/* Skip change list string */
while (str < atom_rom_hdr && *str++)
;
if ((str + STRLEN_NORMAL) < atom_rom_hdr)
strscpy(ctx->build_num, str, STRLEN_NORMAL);
}
struct atom_context *amdgpu_atom_parse(struct card_info *card, void *bios)
{
int base;
@ -1554,6 +1575,7 @@ struct atom_context *amdgpu_atom_parse(struct card_info *card, void *bios)
atom_get_vbios_pn(ctx);
atom_get_vbios_date(ctx);
atom_get_vbios_version(ctx);
atom_get_vbios_build(ctx);
return ctx;
}

2
drivers/gpu/drm/amd/amdgpu/atom.h
View file

@ -37,6 +37,7 @@ struct drm_device;
#define ATOM_ROM_MAGIC "ATOM"
#define ATOM_ROM_MAGIC_PTR 4
#define ATOM_ROM_CFG_PTR 0xC
#define ATOM_ROM_MSG_PTR 0x10
#define ATOM_ROM_CMD_PTR 0x1E
#define ATOM_ROM_DATA_PTR 0x20
@ -151,6 +152,7 @@ struct atom_context {
uint32_t version;
uint8_t vbios_ver_str[STRLEN_NORMAL];
uint8_t date[STRLEN_NORMAL];
uint8_t build_num[STRLEN_NORMAL];
};
extern int amdgpu_atom_debug;