[PATCH] drm/amdgpu: Add only valid firmware version nodes

[Wang, Yang(Kevin)]

[AMD Official Use Only - General]

Reviewed-by: Yang Wang <kevinyang.wang at amd.com>

Best Regards,
Kevin
________________________________
发件人: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> 代表 Lijo Lazar <lijo.lazar at amd.com>
发送时间: 星期五, 八月 25, 2023 17:29
收件人: amd-gfx at lists.freedesktop.org <amd-gfx at lists.freedesktop.org>
抄送: Deucher, Alexander <Alexander.Deucher at amd.com>; Zhang, Hawking <Hawking.Zhang at amd.com>
主题: [PATCH] drm/amdgpu: Add only valid firmware version nodes

Show only firmware version attributes that have valid version. Hide
others.

Signed-off-by: Lijo Lazar <lijo.lazar at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c | 33 ++++++++++++++++++++---
 1 file changed, 29 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c
index 8beefc045e14..b0b37c056c36 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c
@@ -669,15 +669,25 @@ const char *amdgpu_ucode_name(enum AMDGPU_UCODE_ID ucode_id)
         }
 }

+static inline int amdgpu_ucode_is_valid(uint32_t fw_version)
+{
+       if (!fw_version)
+               return -EINVAL;
+
+       return 0;
+}
+
 #define FW_VERSION_ATTR(name, mode, field)                              \
 static ssize_t show_##name(struct device *dev,                          \
-                         struct device_attribute *attr,         \
-                         char *buf)                                     \
+                          struct device_attribute *attr, char *buf)     \
 {                                                                       \
         struct drm_device *ddev = dev_get_drvdata(dev);                 \
         struct amdgpu_device *adev = drm_to_adev(ddev);                 \
                                                                         \
-       return sysfs_emit(buf, "0x%08x\n", adev->field);        \
+       if (!buf)                                                       \
+               return amdgpu_ucode_is_valid(adev->field);              \
+                                                                       \
+       return sysfs_emit(buf, "0x%08x\n", adev->field);                \
 }                                                                       \
 static DEVICE_ATTR(name, mode, show_##name, NULL)

@@ -722,9 +732,24 @@ static struct attribute *fw_attrs[] = {
         NULL
 };

+#define to_dev_attr(x) container_of(x, struct device_attribute, attr)
+
+static umode_t amdgpu_ucode_sys_visible(struct kobject *kobj,
+                                       struct attribute *attr, int idx)
+{
+       struct device_attribute *dev_attr = to_dev_attr(attr);
+       struct device *dev = kobj_to_dev(kobj);
+
+       if (dev_attr->show(dev, dev_attr, NULL) == -EINVAL)
+               return 0;
+
+       return attr->mode;
+}
+
 static const struct attribute_group fw_attr_group = {
         .name = "fw_version",
-       .attrs = fw_attrs
+       .attrs = fw_attrs,
+       .is_visible = amdgpu_ucode_sys_visible
 };

 int amdgpu_ucode_sysfs_init(struct amdgpu_device *adev)
--
2.25.1

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