drm/i915/pxp: limit drm-errors or warning on firmware API failures

MESA driver is creating protected context on every driver handle
creation to query caps bits for app. So when running CI tests,
they are observing hundreds of drm_errors when enabling PXP
in .config but using SOC fusing or BIOS configuration that cannot
support PXP sessions.

The fixes tag referenced below was to resolve a related issue
where we wanted to silence error messages, but that case was due
to outdated IFWI (firmware) that definitely needed an upgrade and
was, at that point, considered a one-off case as opposed to today's
realization that default CI was enabling PXP in kernel config for
all testing.

So with this patch, let's strike a balance between issues that is
critical but are root-caused from HW/platform gaps (louder drm-warn
but just ONCE) vs other cases where it could also come from session
state machine (which cannot be a WARN_ONCE since it can be triggered
due to runtime operation events).

Let's use helpers for these so as more functions are added in future
features / HW (or as FW designers continue to bless upstreaming of
the error codes and meanings), we only need to update the helpers.

NOTE: Don't completely remove FW errors (via drm_debug) or else cusomer
apps that really needs to know that content protection failed won't
be aware of it.

v2: - Add fixes tag (Trvtko)
v3: - Break multi-line drm_dbg strings into separate drm_dbg (Daniele)
    - Fix couple of typecasting nits (Daniele)
v4: - Unsuccessful PXP FW cmd due to platform configuration shouldn't
      use drm_WARN_once (Tvrtko), Switched to use drm_info_once.
v5: - Added "reported-and-tested" by Eero.
Reported-and-tested-by: Eero Tamminen <eero.t.tamminen@intel.com>
Fixes: b762787b ("drm/i915/pxp: Use drm_dbg if arb session failed due to fw version")
Signed-off-by: Alan Previn <alan.previn.teres.alexis@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230323184156.4140659-1-alan.previn.teres.alexis@intel.com

drivers/gpu/drm/i915/pxp/intel_pxp_cmd_interface_cmn.h

@@ -18,6 +18,9 @@
 enum pxp_status {
 	PXP_STATUS_SUCCESS = 0x0,
 	PXP_STATUS_ERROR_API_VERSION = 0x1002,
+	PXP_STATUS_NOT_READY = 0x100e,
+	PXP_STATUS_PLATFCONFIG_KF1_NOVERIF = 0x101a,
+	PXP_STATUS_PLATFCONFIG_KF1_BAD = 0x101f,
 	PXP_STATUS_OP_NOT_PERMITTED = 0x4013
 };
 

drivers/gpu/drm/i915/pxp/intel_pxp_session.c

@@ -74,7 +74,7 @@ static int pxp_create_arb_session(struct intel_pxp *pxp)
 
 	ret = pxp_wait_for_session_state(pxp, ARB_SESSION, true);
 	if (ret) {
-		drm_err(&gt->i915->drm, "arb session failed to go in play\n");
+		drm_dbg(&gt->i915->drm, "arb session failed to go in play\n");
 		return ret;
 	}
 	drm_dbg(&gt->i915->drm, "PXP ARB session is alive\n");

drivers/gpu/drm/i915/pxp/intel_pxp_tee.c

@@ -19,6 +19,37 @@
 #include "intel_pxp_tee.h"
 #include "intel_pxp_types.h"
 
+static bool
+is_fw_err_platform_config(u32 type)
+{
+	switch (type) {
+	case PXP_STATUS_ERROR_API_VERSION:
+	case PXP_STATUS_PLATFCONFIG_KF1_NOVERIF:
+	case PXP_STATUS_PLATFCONFIG_KF1_BAD:
+		return true;
+	default:
+		break;
+	}
+	return false;
+}
+
+static const char *
+fw_err_to_string(u32 type)
+{
+	switch (type) {
+	case PXP_STATUS_ERROR_API_VERSION:
+		return "ERR_API_VERSION";
+	case PXP_STATUS_NOT_READY:
+		return "ERR_NOT_READY";
+	case PXP_STATUS_PLATFCONFIG_KF1_NOVERIF:
+	case PXP_STATUS_PLATFCONFIG_KF1_BAD:
+		return "ERR_PLATFORM_CONFIG";
+	default:
+		break;
+	}
+	return NULL;
+}
+
 static int intel_pxp_tee_io_message(struct intel_pxp *pxp,
 				    void *msg_in, u32 msg_in_size,
 				    void *msg_out, u32 msg_out_max_size,
@@ -307,15 +338,22 @@ int intel_pxp_tee_cmd_create_arb_session(struct intel_pxp *pxp,
 				       &msg_out, sizeof(msg_out),
 				       NULL);
 
-	if (ret)
-		drm_err(&i915->drm, "Failed to send tee msg ret=[%d]\n", ret);
-	else if (msg_out.header.status == PXP_STATUS_ERROR_API_VERSION)
-		drm_dbg(&i915->drm, "PXP firmware version unsupported, requested: "
-			"CMD-ID-[0x%08x] on API-Ver-[0x%08x]\n",
+	if (ret) {
+		drm_err(&i915->drm, "Failed to send tee msg init arb session, ret=[%d]\n", ret);
+	} else if (msg_out.header.status != 0) {
+		if (is_fw_err_platform_config(msg_out.header.status)) {
+			drm_info_once(&i915->drm,
+				      "PXP init-arb-session-%d failed due to BIOS/SOC:0x%08x:%s\n",
+				      arb_session_id, msg_out.header.status,
+				      fw_err_to_string(msg_out.header.status));
+		} else {
+			drm_dbg(&i915->drm, "PXP init-arb-session--%d failed 0x%08x:%st:\n",
+				arb_session_id, msg_out.header.status,
+				fw_err_to_string(msg_out.header.status));
+			drm_dbg(&i915->drm, "     cmd-detail: ID=[0x%08x],API-Ver-[0x%08x]\n",
 				msg_in.header.command_id, msg_in.header.api_version);
-	else if (msg_out.header.status != 0x0)
-		drm_warn(&i915->drm, "PXP firmware failed arb session init request ret=[0x%08x]\n",
-			 msg_out.header.status);
+		}
+	}
 
 	return ret;
 }
@@ -347,10 +385,21 @@ void intel_pxp_tee_end_arb_fw_session(struct intel_pxp *pxp, u32 session_id)
 	if ((ret || msg_out.header.status != 0x0) && ++trials < 3)
 		goto try_again;
 
-	if (ret)
-		drm_err(&i915->drm, "Failed to send tee msg for inv-stream-key-%d, ret=[%d]\n",
+	if (ret) {
+		drm_err(&i915->drm, "Failed to send tee msg for inv-stream-key-%u, ret=[%d]\n",
 			session_id, ret);
-	else if (msg_out.header.status != 0x0)
-		drm_warn(&i915->drm, "PXP firmware failed inv-stream-key-%d with status 0x%08x\n",
-			 session_id, msg_out.header.status);
+	} else if (msg_out.header.status != 0) {
+		if (is_fw_err_platform_config(msg_out.header.status)) {
+			drm_info_once(&i915->drm,
+				      "PXP inv-stream-key-%u failed due to BIOS/SOC :0x%08x:%s\n",
+				      session_id, msg_out.header.status,
+				      fw_err_to_string(msg_out.header.status));
+		} else {
+			drm_dbg(&i915->drm, "PXP inv-stream-key-%u failed 0x%08x:%s:\n",
+				session_id, msg_out.header.status,
+				fw_err_to_string(msg_out.header.status));
+			drm_dbg(&i915->drm, "     cmd-detail: ID=[0x%08x],API-Ver-[0x%08x]\n",
+				msg_in.header.command_id, msg_in.header.api_version);
+		}
+	}
 }