[PATCH v3 2/6] drm/i915/huc: Unified css_header struct for GuC and HuC

Peter Antoine
2016-07-06T14:25:25Z

HuC firmware css header has almost exactly same definition as GuC
firmware except for the sw_version. Also, add a new member fw_type
into intel_uc_fw to indicate what kind of fw it is. So, the loader
will pull right sw_version from header.

v2: rebased on-top of drm-intel-nightly
v3: rebased on-top of drm-intel-nightly (again).

Signed-off-by: Alex Dai <yu.dai@intel.com>
Signed-off-by: Peter Antoine <peter.antoine@intel.com>
---
drivers/gpu/drm/i915/intel_guc.h | 4 ++++
drivers/gpu/drm/i915/intel_guc_fwif.h | 16 ++++++++++---
drivers/gpu/drm/i915/intel_guc_loader.c | 40 ++++++++++++++++++++++-----------
3 files changed, 44 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index 02adcfc..ebf9c8d 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -97,6 +97,9 @@ enum intel_uc_fw_status {
UC_FIRMWARE_SUCCESS
};

+#define UC_FW_TYPE_GUC 0
+#define UC_FW_TYPE_HUC 1
+
/*
* This structure encapsulates all the data needed during the process
* of fetching, caching, and loading the firmware image into the GuC.
@@ -114,6 +117,7 @@ struct intel_uc_fw {
uint16_t major_ver_found;
uint16_t minor_ver_found;

+ uint32_t fw_type;
uint32_t header_size;
uint32_t header_offset;
uint32_t rsa_size;
diff --git a/drivers/gpu/drm/i915/intel_guc_fwif.h b/drivers/gpu/drm/i915/intel_guc_fwif.h
index 944786d..a69ee36 100644
--- a/drivers/gpu/drm/i915/intel_guc_fwif.h
+++ b/drivers/gpu/drm/i915/intel_guc_fwif.h
@@ -154,7 +154,7 @@
* The GuC firmware layout looks like this:
*
* +-------------------------------+
- * | guc_css_header |
+ * | uc_css_header |
* | contains major/minor version |
* +-------------------------------+
* | uCode |
@@ -180,9 +180,16 @@
* 3. Length info of each component can be found in header, in dwords.
* 4. Modulus and exponent key are not required by driver. They may not appear
* in fw. So driver will load a truncated firmware in this case.
+ *
+ * HuC firmware layout is same as GuC firmware.
+ *
+ * HuC firmware css header is different. However, the only difference is where
+ * the version information is saved. The uc_css_header is unified to support
+ * both. Driver should get HuC version from uc_css_header.huc_sw_version, while
+ * uc_css_header.guc_sw_version for GuC.
*/

-struct guc_css_header {
+struct uc_css_header {
uint32_t module_type;
/* header_size includes all non-uCode bits, including css_header, rsa
* key, modulus key and exponent data. */
@@ -213,7 +220,10 @@ struct guc_css_header {

char username[8];
char buildnumber[12];
- uint32_t device_id;
+ union {
+ uint32_t device_id;
+ uint32_t huc_sw_version;
+ };
uint32_t guc_sw_version;
uint32_t prod_preprod_fw;
uint32_t reserved[12];
diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c b/drivers/gpu/drm/i915/intel_guc_loader.c
index 1afa49b..42b6509 100644
--- a/drivers/gpu/drm/i915/intel_guc_loader.c
+++ b/drivers/gpu/drm/i915/intel_guc_loader.c
@@ -553,7 +553,7 @@ void intel_uc_fw_fetch(struct drm_device *dev, struct intel_uc_fw *uc_fw)
{
struct drm_i915_gem_object *obj;
const struct firmware *fw;
- struct guc_css_header *css;
+ struct uc_css_header *css;
size_t size;
int err;

@@ -570,19 +570,19 @@ void intel_uc_fw_fetch(struct drm_device *dev, struct intel_uc_fw *uc_fw)
uc_fw->uc_fw_path, fw);

/* Check the size of the blob before examining buffer contents */
- if (fw->size < sizeof(struct guc_css_header)) {
+ if (fw->size < sizeof(struct uc_css_header)) {
DRM_ERROR("Firmware header is missing\n");
goto fail;
}

- css = (struct guc_css_header *)fw->data;
+ css = (struct uc_css_header *)fw->data;

/* Firmware bits always start from header */
uc_fw->header_offset = 0;
uc_fw->header_size = (css->header_size_dw - css->modulus_size_dw -
css->key_size_dw - css->exponent_size_dw) * sizeof(u32);

- if (uc_fw->header_size != sizeof(struct guc_css_header)) {
+ if (uc_fw->header_size != sizeof(struct uc_css_header)) {
DRM_ERROR("CSS header definition mismatch\n");
goto fail;
}
@@ -606,21 +606,35 @@ void intel_uc_fw_fetch(struct drm_device *dev, struct intel_uc_fw *uc_fw)
goto fail;
}

- /* Header and uCode will be loaded to WOPCM. Size of the two. */
- size = uc_fw->header_size + uc_fw->ucode_size;
- if (size > guc_wopcm_size(to_i915(dev))) {
- DRM_ERROR("Firmware is too large to fit in WOPCM\n");
- goto fail;
- }
-
/*
* The GuC firmware image has the version number embedded at a well-known
* offset within the firmware blob; note that major / minor version are
* TWO bytes each (i.e. u16), although all pointers and offsets are defined
* in terms of bytes (u8).
*/
- uc_fw->major_ver_found = css->guc_sw_version >> 16;
- uc_fw->minor_ver_found = css->guc_sw_version & 0xFFFF;
+ switch (uc_fw->fw_type) {
+ case UC_FW_TYPE_GUC:
+ /* Header and uCode will be loaded to WOPCM. Size of the two. */
+ size = uc_fw->header_size + uc_fw->ucode_size;
+
+ /* Top 32k of WOPCM is reserved (8K stack + 24k RC6 context). */
+ if (size > guc_wopcm_size(to_i915(dev))) {
+ DRM_ERROR("Firmware is too large to fit in WOPCM\n");
+ goto fail;
+ }
+
+ uc_fw->major_ver_found = css->guc_sw_version >> 16;
+ uc_fw->minor_ver_found = css->guc_sw_version & 0xFFFF;
+ break;
+ case UC_FW_TYPE_HUC:
+ uc_fw->major_ver_found = css->huc_sw_version >> 16;
+ uc_fw->minor_ver_found = css->huc_sw_version & 0xFFFF;
+ break;
+ default:
+ DRM_ERROR("Unknown firmware type %d\n", uc_fw->fw_type);
+ err = -ENOEXEC;
+ goto fail;
+ }

if (uc_fw->major_ver_found != uc_fw->major_ver_wanted ||
uc_fw->minor_ver_found < uc_fw->minor_ver_wanted) {
--
1.9.1