[PATCH v6 12/13] drm: nova: Report GPU short name in GPU info

[Alistair Popple <apopple@nvidia.com>]

Add the short GPU name to the GPU info structure. As with the full name
it is copied from a validated, NUL-terminated string extracted by
nova-core rather than from the raw firmware bytes.

Signed-off-by: Alistair Popple <apopple@nvidia.com>

---

Changes since v5:

 - Add a validating gpu_short_name() accessor to nova-core and use it
   instead of exposing the raw bytes, as suggested by Danilo

Changes since v4:

 - New for v5
---
 drivers/gpu/drm/nova/file.rs             |  5 +++++
 drivers/gpu/nova-core/gsp/commands.rs    | 13 +++++++++++++
 drivers/gpu/nova-core/gsp/fw/commands.rs |  5 +++++
 include/uapi/drm/nova_drm.h              |  5 +++++
 4 files changed, 28 insertions(+)

diff --git a/drivers/gpu/drm/nova/file.rs b/drivers/gpu/drm/nova/file.rs
index 4753d9bca13b..d2e1f9f798a4 100644
--- a/drivers/gpu/drm/nova/file.rs
+++ b/drivers/gpu/drm/nova/file.rs
@@ -61,6 +61,11 @@ fn new(reg_data: &DrmRegData<'_>) -> Result<Self> {
 
         copy_name(&mut info.gpu_name, gsp_static_info.gpu_name().map_err(|_| EINVAL)?)?;
 
+        copy_name(
+            &mut info.gpu_short_name,
+            gsp_static_info.gpu_short_name().map_err(|_| EINVAL)?,
+        )?;
+
         Ok(Self(info))
     }
 }
diff --git a/drivers/gpu/nova-core/gsp/commands.rs b/drivers/gpu/nova-core/gsp/commands.rs
index 00cfcef260c5..5ea0f625f7df 100644
--- a/drivers/gpu/nova-core/gsp/commands.rs
+++ b/drivers/gpu/nova-core/gsp/commands.rs
@@ -214,6 +214,7 @@ fn init(&self) -> impl Init<Self::Command, Self::InitError> {
 /// The reply from the GSP to the [`GetGspStaticInfo`] command.
 pub struct GetGspStaticInfoReply {
     gpu_name: [u8; 64],
+    gpu_short_name: [u8; 64],
     /// Usable FB (VRAM) regions for driver memory allocation.
     pub(crate) usable_fb_regions: KVec<Range<u64>>,
 }
@@ -234,6 +235,7 @@ fn read(
 
         Ok(GetGspStaticInfoReply {
             gpu_name: msg.gpu_name_str(),
+            gpu_short_name: msg.gpu_short_name_str(),
             usable_fb_regions,
         })
     }
@@ -261,6 +263,17 @@ pub fn gpu_name(&self) -> core::result::Result<&str, GpuNameError> {
             .map_err(GpuNameError::InvalidUtf8)
     }
 
+    /// Returns the short name of the GPU as a string.
+    ///
+    /// Returns an error if the string given by the GSP does not contain a null terminator or
+    /// contains invalid UTF-8.
+    pub fn gpu_short_name(&self) -> core::result::Result<&str, GpuNameError> {
+        CStr::from_bytes_until_nul(&self.gpu_short_name)
+            .map_err(GpuNameError::NoNullTerminator)?
+            .to_str()
+            .map_err(GpuNameError::InvalidUtf8)
+    }
+
     /// Returns the total usable VRAM size in bytes, i.e. the summed lengths of all usable FB
     /// regions.
     pub fn vram_size(&self) -> u64 {
diff --git a/drivers/gpu/nova-core/gsp/fw/commands.rs b/drivers/gpu/nova-core/gsp/fw/commands.rs
index 6dc31d1bf5ae..f62fb85f4473 100644
--- a/drivers/gpu/nova-core/gsp/fw/commands.rs
+++ b/drivers/gpu/nova-core/gsp/fw/commands.rs
@@ -131,6 +131,11 @@ impl GspStaticConfigInfo {
         self.0.gpuNameString
     }
 
+    /// Returns a bytes array containing the (hopefully) zero-terminated short name of this GPU.
+    pub(crate) fn gpu_short_name_str(&self) -> [u8; 64] {
+        self.0.gpuShortNameString
+    }
+
     /// Returns an iterator over valid FB regions from GSP firmware data.
     fn fb_regions(
         &self,
diff --git a/include/uapi/drm/nova_drm.h b/include/uapi/drm/nova_drm.h
index c692cacaa552..b0af9945b6c5 100644
--- a/include/uapi/drm/nova_drm.h
+++ b/include/uapi/drm/nova_drm.h
@@ -191,6 +191,11 @@ struct drm_nova_info_gpu {
 	 * @gpu_name: NUL-terminated full GPU name.
 	 */
 	__u8 gpu_name[64];
+
+	/**
+	 * @gpu_short_name: NUL-terminated short GPU name.
+	 */
+	__u8 gpu_short_name[64];
 };
 
 #define DRM_NOVA_GETPARAM		0x00
-- 
2.54.0