Re: [PATCH v2 2/3] drm/i915/uc: Add patch level version number support

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On 8/25/2022 8:05 PM, John.C.Harrison@xxxxxxxxx wrote:

From: John Harrison <John.C.Harrison@xxxxxxxxx>

With the move to un-versioned filenames, it becomes more difficult to
know exactly what version of a given firmware is being used. So add
the patch level version number to the debugfs output.

Also, support matching by patch level when selecting code paths for
firmware compatibility. While a patch level change cannot be backwards
breaking, it is potentially possible that a new feature only works
from a given patch level onwards (even though it was theoretically
added in an earlier version that bumped the major or minor version).

Signed-off-by: John Harrison <John.C.Harrison@xxxxxxxxx>
---
  .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 10 +++---
  drivers/gpu/drm/i915/gt/uc/intel_uc.c         |  6 ++--
  drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c      | 36 ++++++++++++++-----
  drivers/gpu/drm/i915/gt/uc/intel_uc_fw.h      |  6 ++++
  drivers/gpu/drm/i915/gt/uc/intel_uc_fw_abi.h  |  8 +++--
  5 files changed, 47 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index 04393932623c7..64c4e83153f47 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -1868,7 +1868,7 @@ int intel_guc_submission_init(struct intel_guc *guc)
  	if (guc->submission_initialized)
  		return 0;
- if (guc->fw.file_selected.major_ver < 70) { 
+	if (GET_UC_VER(guc) < MAKE_UC_VER(70, 0, 0)) {
  		ret = guc_lrc_desc_pool_create_v69(guc);
  		if (ret)
  			return ret;
@@ -2303,7 +2303,7 @@ static int register_context(struct intel_context *ce, bool loop)
  	GEM_BUG_ON(intel_context_is_child(ce));
  	trace_intel_context_register(ce);
- if (guc->fw.file_selected.major_ver >= 70) 
+	if (GET_UC_VER(guc) >= MAKE_UC_VER(70, 0, 0))
  		ret = register_context_v70(guc, ce, loop);
  	else
  		ret = register_context_v69(guc, ce, loop);
@@ -2315,7 +2315,7 @@ static int register_context(struct intel_context *ce, bool loop)
  		set_context_registered(ce);
  		spin_unlock_irqrestore(&ce->guc_state.lock, flags);
- if (guc->fw.file_selected.major_ver >= 70) 
+		if (GET_UC_VER(guc) >= MAKE_UC_VER(70, 0, 0))
  			guc_context_policy_init_v70(ce, loop);
  	}
@@ -2921,7 +2921,7 @@ static void __guc_context_set_preemption_timeout(struct intel_guc *guc, 
  						 u16 guc_id,
  						 u32 preemption_timeout)
  {
-	if (guc->fw.file_selected.major_ver >= 70) {
+	if (GET_UC_VER(guc) >= MAKE_UC_VER(70, 0, 0)) {
  		struct context_policy policy;
__guc_context_policy_start_klv(&policy, guc_id); 
@@ -3186,7 +3186,7 @@ static int guc_context_alloc(struct intel_context *ce)
  static void __guc_context_set_prio(struct intel_guc *guc,
  				   struct intel_context *ce)
  {
-	if (guc->fw.file_selected.major_ver >= 70) {
+	if (GET_UC_VER(guc) >= MAKE_UC_VER(70, 0, 0)) {
  		struct context_policy policy;
__guc_context_policy_start_klv(&policy, ce->guc_id.id); 
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc.c b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
index d965ac4832d60..abf4e142596d0 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
@@ -435,9 +435,11 @@ static void print_fw_ver(struct intel_uc *uc, struct intel_uc_fw *fw)
  {
  	struct drm_i915_private *i915 = uc_to_gt(uc)->i915;
- drm_info(&i915->drm, "%s firmware %s version %u.%u\n", 
+	drm_info(&i915->drm, "%s firmware %s version %u.%u.%u\n",
  		 intel_uc_fw_type_repr(fw->type), fw->file_selected.path,
-		 fw->file_selected.major_ver, fw->file_selected.minor_ver);
+		 fw->file_selected.major_ver,
+		 fw->file_selected.minor_ver,
+		 fw->file_selected.patch_ver);
  }
static int __uc_init_hw(struct intel_uc *uc) 
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
index 94cf2d4a46e6f..7c45c097d6845 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
@@ -447,10 +447,12 @@ static int check_gsc_manifest(const struct firmware *fw,
  			      struct intel_uc_fw *uc_fw)
  {
  	u32 *dw = (u32 *)fw->data;
-	u32 version = dw[HUC_GSC_VERSION_DW];
+	u32 version_hi = dw[HUC_GSC_VERSION_HI_DW];
+	u32 version_lo = dw[HUC_GSC_VERSION_LO_DW];
- uc_fw->file_selected.major_ver = FIELD_GET(HUC_GSC_MAJOR_VER_MASK, version); 
-	uc_fw->file_selected.minor_ver = FIELD_GET(HUC_GSC_MINOR_VER_MASK, version);
+	uc_fw->file_selected.major_ver = FIELD_GET(HUC_GSC_MAJOR_VER_HI_MASK, version_hi);
+	uc_fw->file_selected.minor_ver = FIELD_GET(HUC_GSC_MINOR_VER_HI_MASK, version_hi);
+	uc_fw->file_selected.patch_ver = FIELD_GET(HUC_GSC_PATCH_VER_LO_MASK, version_lo);
return 0; 
  }
@@ -512,6 +514,8 @@ static int check_ccs_header(struct drm_i915_private *i915,
  						   css->sw_version);
  	uc_fw->file_selected.minor_ver = FIELD_GET(CSS_SW_VERSION_UC_MINOR,
  						   css->sw_version);
+	uc_fw->file_selected.patch_ver = FIELD_GET(CSS_SW_VERSION_UC_PATCH,
+						   css->sw_version);
if (uc_fw->type == INTEL_UC_FW_TYPE_GUC) 
  		uc_fw->private_data_size = css->private_data_size;
@@ -1000,6 +1004,8 @@ size_t intel_uc_fw_copy_rsa(struct intel_uc_fw *uc_fw, void *dst, u32 max_len)
   */
  void intel_uc_fw_dump(const struct intel_uc_fw *uc_fw, struct drm_printer *p)
  {
+	u32 ver_sel, ver_want;
+
  	drm_printf(p, "%s firmware: %s\n",
  		   intel_uc_fw_type_repr(uc_fw->type), uc_fw->file_selected.path);
  	if (uc_fw->file_selected.path != uc_fw->file_wanted.path)
@@ -1007,13 +1013,25 @@ void intel_uc_fw_dump(const struct intel_uc_fw *uc_fw, struct drm_printer *p)
  			   intel_uc_fw_type_repr(uc_fw->type), uc_fw->file_wanted.path);
  	drm_printf(p, "\tstatus: %s\n",
  		   intel_uc_fw_status_repr(uc_fw->status));
-	if (uc_fw->file_wanted.major_ver)
-		drm_printf(p, "\tversion: wanted %u.%u, found %u.%u\n",
-			   uc_fw->file_wanted.major_ver, uc_fw->file_wanted.minor_ver,
-			   uc_fw->file_selected.major_ver, uc_fw->file_selected.minor_ver);
+	ver_sel = MAKE_UC_VER(uc_fw->file_selected.major_ver,
+			      uc_fw->file_selected.minor_ver,
+			      uc_fw->file_selected.patch_ver);
+	ver_want = MAKE_UC_VER(uc_fw->file_wanted.major_ver,
+			       uc_fw->file_wanted.minor_ver,
+			       uc_fw->file_wanted.patch_ver);
+	if (ver_sel < ver_want)
+		drm_printf(p, "\tversion: wanted %u.%u.%u, found %u.%u.%u\n",
+			   uc_fw->file_wanted.major_ver,
+			   uc_fw->file_wanted.minor_ver,
+			   uc_fw->file_wanted.patch_ver,
+			   uc_fw->file_selected.major_ver,
+			   uc_fw->file_selected.minor_ver,
+			   uc_fw->file_selected.patch_ver);
  	else
-		drm_printf(p, "\tversion: found %u.%u\n",
-			   uc_fw->file_selected.major_ver, uc_fw->file_selected.minor_ver);
+		drm_printf(p, "\tversion: found %u.%u.%u\n",
+			   uc_fw->file_selected.major_ver,
+			   uc_fw->file_selected.minor_ver,
+			   uc_fw->file_selected.patch_ver);
  	drm_printf(p, "\tuCode: %u bytes\n", uc_fw->ucode_size);
  	drm_printf(p, "\tRSA: %u bytes\n", uc_fw->rsa_size);
  }
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.h b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.h
index 344763c942e37..cb586f7df270b 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.h
@@ -73,6 +73,7 @@ struct intel_uc_fw_file {
  	const char *path;
  	u16 major_ver;
  	u16 minor_ver;
+	u16 patch_ver;
  };
/* 
@@ -108,6 +109,11 @@ struct intel_uc_fw {
  	bool loaded_via_gsc;
  };
+#define MAKE_UC_VER(maj, min, pat) ((pat) | ((min) << 8) | ((maj) << 16)) 
+#define GET_UC_VER(uc)			(MAKE_UC_VER((uc)->fw.file_selected.major_ver, \
+						     (uc)->fw.file_selected.minor_ver, \
+						     (uc)->fw.file_selected.patch_ver))
Might be worth saving this in a variable to not have to recalculate it each time. not a blocker. 


+
  #ifdef CONFIG_DRM_I915_DEBUG_GUC
  void intel_uc_fw_change_status(struct intel_uc_fw *uc_fw,
  			       enum intel_uc_fw_status status);
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw_abi.h b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw_abi.h
index b05e0e35b734c..f214d24fbcf0d 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw_abi.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw_abi.h
@@ -83,8 +83,10 @@ struct uc_css_header {
  } __packed;
  static_assert(sizeof(struct uc_css_header) == 128);
-#define HUC_GSC_VERSION_DW 44 
-#define   HUC_GSC_MAJOR_VER_MASK	(0xFF << 0)
-#define   HUC_GSC_MINOR_VER_MASK	(0xFF << 16)
+#define HUC_GSC_VERSION_HI_DW		44
+#define   HUC_GSC_MAJOR_VER_HI_MASK	(0xFF << 0)
+#define   HUC_GSC_MINOR_VER_HI_MASK	(0xFF << 16)
+#define HUC_GSC_VERSION_LO_DW		45
+#define   HUC_GSC_PATCH_VER_LO_MASK	(0xFF << 16)
AFAICS the patch version is in the lower 16 bits here, while the higher 16 are the build number. e.g for dg2_7.10.0_gsc.bin (available in drm-firmware) I see: 

[00000b0] 0007 000a 0000 0574

Daniele
#endif /* _INTEL_UC_FW_ABI_H */
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