[PATCH v6 05/45] drm/amd: Add a new helper for loading/validating microcode

Mario Limonciello
2023-01-05T03:44:32Z

All microcode runs a basic validation after it's been loaded. Each
IP block as part of init will run both.

Introduce a wrapper for request_firmware and amdgpu_ucode_validate.
This wrapper will also remap any error codes from request_firmware
to -ENODEV. This is so that early_init will fail if firmware couldn't
be loaded instead of the IP block being disabled.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
---
v5->v6:
* Fix argument to be ** not *
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c | 36 +++++++++++++++++++++++
drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.h | 3 ++
2 files changed, 39 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c
index eafcddce58d3..8ebfec12da87 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c
@@ -1312,3 +1312,39 @@ void amdgpu_ucode_ip_version_decode(struct amdgpu_device *adev, int block_type,

snprintf(ucode_prefix, len, "%s_%d_%d_%d", ip_name, maj, min, rev);
}
+
+/*
+ * amdgpu_ucode_request - Fetch and validate amdgpu microcode
+ *
+ * @adev: amdgpu device
+ * @fw: pointer to load firmware to
+ * @fw_name: firmware to load
+ *
+ * This is a helper that will use request_firmware and amdgpu_ucode_validate
+ * to load and run basic validation on firmware. If the load fails, remap
+ * the error code to -ENODEV, so that early_init functions will fail to load.
+ */
+int amdgpu_ucode_request(struct amdgpu_device *adev, const struct firmware **fw,
+ const char *fw_name)
+{
+ int err = request_firmware(fw, fw_name, adev->dev);
+
+ if (err)
+ return -ENODEV;
+ err = amdgpu_ucode_validate(*fw);
+ if (err)
+ dev_dbg(adev->dev, "\"%s\" failed to validate\n", fw_name);
+
+ return err;
+}
+
+/*
+ * amdgpu_ucode_release - Release firmware microcode
+ *
+ * @fw: pointer to firmware to release
+ */
+void amdgpu_ucode_release(const struct firmware **fw)
+{
+ release_firmware(*fw);
+ *fw = NULL;
+}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.h
index 552e06929229..848579d4988b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.h
@@ -544,6 +544,9 @@ void amdgpu_ucode_print_sdma_hdr(const struct common_firmware_header *hdr);
void amdgpu_ucode_print_psp_hdr(const struct common_firmware_header *hdr);
void amdgpu_ucode_print_gpu_info_hdr(const struct common_firmware_header *hdr);
int amdgpu_ucode_validate(const struct firmware *fw);
+int amdgpu_ucode_request(struct amdgpu_device *adev, const struct firmware **fw,
+ const char *fw_name);
+void amdgpu_ucode_release(const struct firmware **fw);
bool amdgpu_ucode_hdr_version(union amdgpu_firmware_header *hdr,
uint16_t hdr_major, uint16_t hdr_minor);

--
2.34.1