[PATCH v6 1/3] drm/i915: Add Guc/HuC firmware details to error state

[Michal Wajdeczko <michal.wajdeczko@intel.com>]

Include GuC and HuC firmware details in captured error state
to provide additional debug information. To reuse existing
uc firmware pretty printer, introduce new drm-printer variant
that works with our i915_error_state_buf output. Also update
uc firmware pretty printer to accept const input.

v2: don't rely on current caps (Chris)
    dump correct fw info (Michal)
v3: simplify capture of custom paths (Chris)
v4: improve 'why' comment (Joonas)
    trim output if no fw path (Michal)
    group code around uc error state (Michal)
v5: use error in cleanup_uc (Michal)

Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h       |  5 +++
 drivers/gpu/drm/i915/i915_gpu_error.c | 65 +++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_uc_fw.c    |  6 +++-
 drivers/gpu/drm/i915/intel_uc_fw.h    |  2 +-
 4 files changed, 76 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 366ba74..f19f0fa 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -911,6 +911,11 @@ struct i915_gpu_state {
 	struct intel_device_info device_info;
 	struct i915_params params;
 
+	struct i915_error_uc {
+		struct intel_uc_fw guc_fw;
+		struct intel_uc_fw huc_fw;
+	} uc;
+
 	/* Generic register state */
 	u32 eir;
 	u32 pgtbl_er;
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 653fb69..4500fc8 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -30,6 +30,8 @@
 #include <generated/utsrelease.h>
 #include <linux/stop_machine.h>
 #include <linux/zlib.h>
+#include <drm/drm_print.h>
+
 #include "i915_drv.h"
 
 static const char *engine_str(int engine)
@@ -175,6 +177,21 @@ static void i915_error_puts(struct drm_i915_error_state_buf *e,
 #define err_printf(e, ...) i915_error_printf(e, __VA_ARGS__)
 #define err_puts(e, s) i915_error_puts(e, s)
 
+static void __i915_printfn_error(struct drm_printer *p, struct va_format *vaf)
+{
+	i915_error_vprintf(p->arg, vaf->fmt, *vaf->va);
+}
+
+static inline struct drm_printer
+i915_error_printer(struct drm_i915_error_state_buf *e)
+{
+	struct drm_printer p = {
+		.printfn = __i915_printfn_error,
+		.arg = e,
+	};
+	return p;
+}
+
 #ifdef CONFIG_DRM_I915_COMPRESS_ERROR
 
 struct compress {
@@ -589,11 +606,26 @@ static void err_print_pciid(struct drm_i915_error_state_buf *m,
 		   pdev->subsystem_device);
 }
 
+static void err_print_uc(struct drm_i915_error_state_buf *m,
+			 const struct i915_error_uc *error_uc)
+{
+	struct drm_printer p = i915_error_printer(m);
+	const struct i915_gpu_state *error =
+		container_of(error_uc, typeof(*error), uc);
+
+	if (!error->device_info.has_guc)
+		return;
+
+	intel_uc_fw_dump(&error_uc->guc_fw, &p);
+	intel_uc_fw_dump(&error_uc->huc_fw, &p);
+}
+
 int i915_error_state_to_str(struct drm_i915_error_state_buf *m,
 			    const struct i915_gpu_state *error)
 {
 	struct drm_i915_private *dev_priv = m->i915;
 	struct drm_i915_error_object *obj;
+
 	int i, j;
 
 	if (!error) {
@@ -773,6 +805,7 @@ int i915_error_state_to_str(struct drm_i915_error_state_buf *m,
 
 	err_print_capabilities(m, &error->device_info);
 	err_print_params(m, &error->params);
+	err_print_uc(m, &error->uc);
 
 	if (m->bytes == 0 && m->err)
 		return m->err;
@@ -831,6 +864,14 @@ static __always_inline void free_param(const char *type, void *x)
 		kfree(*(void **)x);
 }
 
+static void cleanup_uc_state(struct i915_gpu_state *error)
+{
+	struct i915_error_uc *error_uc = &error->uc;
+
+	kfree(error_uc->guc_fw.path);
+	kfree(error_uc->huc_fw.path);
+}
+
 void __i915_gpu_state_free(struct kref *error_ref)
 {
 	struct i915_gpu_state *error =
@@ -870,6 +911,8 @@ void __i915_gpu_state_free(struct kref *error_ref)
 	I915_PARAMS_FOR_EACH(FREE);
 #undef FREE
 
+	cleanup_uc_state(error);
+
 	kfree(error);
 }
 
@@ -1559,6 +1602,26 @@ static void i915_capture_pinned_buffers(struct drm_i915_private *dev_priv,
 	error->pinned_bo = bo;
 }
 
+static void capture_uc_state(struct i915_gpu_state *error)
+{
+	struct drm_i915_private *i915 = error->i915;
+	struct i915_error_uc *error_uc = &error->uc;
+
+	/* Capturing uC state won't be useful if there is no GuC */
+	if (!error->device_info.has_guc)
+		return;
+
+	error_uc->guc_fw = i915->guc.fw;
+	error_uc->huc_fw = i915->huc.fw;
+
+	/* Non-default firmware paths will be specified by the modparam.
+	 * As modparams are generally accesible from the userspace make
+	 * explicit copies of the firmware paths.
+	 */
+	error_uc->guc_fw.path = kstrdup(i915->guc.fw.path, GFP_ATOMIC);
+	error_uc->huc_fw.path = kstrdup(i915->huc.fw.path, GFP_ATOMIC);
+}
+
 static void i915_gem_capture_guc_log_buffer(struct drm_i915_private *dev_priv,
 					    struct i915_gpu_state *error)
 {
@@ -1710,6 +1773,8 @@ static int capture(void *data)
 	I915_PARAMS_FOR_EACH(DUP);
 #undef DUP
 
+	capture_uc_state(error);
+
 	i915_capture_gen_state(error->i915, error);
 	i915_capture_reg_state(error->i915, error);
 	i915_gem_record_fences(error->i915, error);
diff --git a/drivers/gpu/drm/i915/intel_uc_fw.c b/drivers/gpu/drm/i915/intel_uc_fw.c
index 973888e..79a8797 100644
--- a/drivers/gpu/drm/i915/intel_uc_fw.c
+++ b/drivers/gpu/drm/i915/intel_uc_fw.c
@@ -299,10 +299,14 @@ void intel_uc_fw_fini(struct intel_uc_fw *uc_fw)
  *
  * Pretty printer for uC firmware.
  */
-void intel_uc_fw_dump(struct intel_uc_fw *uc_fw, struct drm_printer *p)
+void intel_uc_fw_dump(const struct intel_uc_fw *uc_fw, struct drm_printer *p)
 {
 	drm_printf(p, "%s firmware: %s\n",
 		   intel_uc_fw_type_repr(uc_fw->type), uc_fw->path);
+
+	if (!uc_fw->path)
+		return;
+
 	drm_printf(p, "\tstatus: fetch %s, load %s\n",
 		   intel_uc_fw_status_repr(uc_fw->fetch_status),
 		   intel_uc_fw_status_repr(uc_fw->load_status));
diff --git a/drivers/gpu/drm/i915/intel_uc_fw.h b/drivers/gpu/drm/i915/intel_uc_fw.h
index 1329036..5394d9d 100644
--- a/drivers/gpu/drm/i915/intel_uc_fw.h
+++ b/drivers/gpu/drm/i915/intel_uc_fw.h
@@ -116,6 +116,6 @@ int intel_uc_fw_upload(struct intel_uc_fw *uc_fw,
 		       int (*xfer)(struct intel_uc_fw *uc_fw,
 				   struct i915_vma *vma));
 void intel_uc_fw_fini(struct intel_uc_fw *uc_fw);
-void intel_uc_fw_dump(struct intel_uc_fw *uc_fw, struct drm_printer *p);
+void intel_uc_fw_dump(const struct intel_uc_fw *uc_fw, struct drm_printer *p);
 
 #endif
-- 
2.7.4

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