From 8e9c2f621893ae2cc57c34fa96ece011eebd94b7 Mon Sep 17 00:00:00 2001
From: "Robert M. Fosha" <robert.m.fosha@intel.com>
Date: Tue, 25 Jun 2019 09:41:07 -0700
Subject: drm/i915/guc: Add debug capture of GuC exception
Git-commit: 8e9c2f621893ae2cc57c34fa96ece011eebd94b7
Patch-mainline: v5.4-rc1
References: bsc#1152489
Detect GuC firmware load failure due to an exception during execution
in GuC firmware. Output the GuC EIP where exception occurred to dmesg
for GuC debug information.
v2: correct typos, change debug message and error code returned for
GuC exception (Michal)
Signed-off-by: Robert M. Fosha <robert.m.fosha@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190625164107.21512-1-robert.m.fosha@intel.com
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
drivers/gpu/drm/i915/intel_guc_fw.c | 7 +++++++
drivers/gpu/drm/i915/intel_guc_reg.h | 1 +
2 files changed, 8 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_guc_fw.c b/drivers/gpu/drm/i915/intel_guc_fw.c
index 72cdafd9636a..970f39ef248b 100644
--- a/drivers/gpu/drm/i915/intel_guc_fw.c
+++ b/drivers/gpu/drm/i915/intel_guc_fw.c
@@ -197,6 +197,7 @@ static inline bool guc_ready(struct intel_guc *guc, u32 *status)
static int guc_wait_ucode(struct intel_guc *guc)
{
+ struct drm_i915_private *i915 = guc_to_i915(guc);
u32 status;
int ret;
@@ -216,6 +217,12 @@ static int guc_wait_ucode(struct intel_guc *guc)
ret = -ENOEXEC;
}
+ if ((status & GS_UKERNEL_MASK) == GS_UKERNEL_EXCEPTION) {
+ DRM_ERROR("GuC firmware exception. EIP: %#x\n",
+ intel_uncore_read(&i915->uncore, SOFT_SCRATCH(13)));
+ ret = -ENXIO;
+ }
+
if (ret == 0 && !guc_xfer_completed(guc, &status)) {
DRM_ERROR("GuC is ready, but the xfer %08x is incomplete\n",
status);
diff --git a/drivers/gpu/drm/i915/intel_guc_reg.h b/drivers/gpu/drm/i915/intel_guc_reg.h
index a214f8b71929..d90b88fadb5e 100644
--- a/drivers/gpu/drm/i915/intel_guc_reg.h
+++ b/drivers/gpu/drm/i915/intel_guc_reg.h
@@ -37,6 +37,7 @@
#define GS_UKERNEL_MASK (0xFF << GS_UKERNEL_SHIFT)
#define GS_UKERNEL_LAPIC_DONE (0x30 << GS_UKERNEL_SHIFT)
#define GS_UKERNEL_DPC_ERROR (0x60 << GS_UKERNEL_SHIFT)
+#define GS_UKERNEL_EXCEPTION (0x70 << GS_UKERNEL_SHIFT)
#define GS_UKERNEL_READY (0xF0 << GS_UKERNEL_SHIFT)
#define GS_MIA_SHIFT 16
#define GS_MIA_MASK (0x07 << GS_MIA_SHIFT)
--
2.28.0