drm/xe: nuke GuC on unload

On PVC unloading followed by reloading the module often results in a
completely dead machine (seems to be plaguing CI). Resetting the GuC
like we do at load seems to cure it at least when locally testing this.

v2:
  - Move pc_fini into guc_fini. We want to do the GuC reset just after
    calling pc_fini, otherwise we encounter communication failures. It
    also seems like a good idea to do the reset before we start releasing
    the various other GuC resources. In the case of pc_fini there is an
    explicit stop, but for other stuff like logs, ads, ctb there is not.

References: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/542
References: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/597Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_guc.c

@@ -5,6 +5,8 @@
 
 #include "xe_guc.h"
 
+#include <drm/drm_managed.h>
+
 #include "generated/xe_wa_oob.h"
 #include "regs/xe_gt_regs.h"
 #include "regs/xe_guc_regs.h"
@@ -20,6 +22,7 @@
 #include "xe_guc_submit.h"
 #include "xe_mmio.h"
 #include "xe_platform_types.h"
+#include "xe_uc.h"
 #include "xe_uc_fw.h"
 #include "xe_wa.h"
 #include "xe_wopcm.h"
@@ -217,6 +220,16 @@ static void guc_write_params(struct xe_guc *guc)
 		xe_mmio_write32(gt, SOFT_SCRATCH(1 + i), guc->params[i]);
 }
 
+static void guc_fini(struct drm_device *drm, void *arg)
+{
+	struct xe_guc *guc = arg;
+
+	xe_force_wake_get(gt_to_fw(guc_to_gt(guc)), XE_FORCEWAKE_ALL);
+	xe_guc_pc_fini(&guc->pc);
+	xe_uc_fini_hw(&guc_to_gt(guc)->uc);
+	xe_force_wake_put(gt_to_fw(guc_to_gt(guc)), XE_FORCEWAKE_ALL);
+}
+
 int xe_guc_init(struct xe_guc *guc)
 {
 	struct xe_device *xe = guc_to_xe(guc);
@@ -244,6 +257,10 @@ int xe_guc_init(struct xe_guc *guc)
 	if (ret)
 		goto out;
 
+	ret = drmm_add_action_or_reset(&gt_to_xe(gt)->drm, guc_fini, guc);
+	if (ret)
+		goto out;
+
 	guc_init_params(guc);
 
 	if (xe_gt_is_media_type(gt))

drivers/gpu/drm/xe/xe_guc_pc.c

@@ -884,10 +884,8 @@ int xe_guc_pc_stop(struct xe_guc_pc *pc)
 	return ret;
 }
 
-static void pc_fini(struct drm_device *drm, void *arg)
+void xe_guc_pc_fini(struct xe_guc_pc *pc)
 {
-	struct xe_guc_pc *pc = arg;
-
 	XE_WARN_ON(xe_guc_pc_gucrc_disable(pc));
 	XE_WARN_ON(xe_guc_pc_stop(pc));
 	sysfs_remove_files(pc_to_gt(pc)->sysfs, pc_attrs);
@@ -925,9 +923,5 @@ int xe_guc_pc_init(struct xe_guc_pc *pc)
 	if (err)
 		return err;
 
-	err = drmm_add_action_or_reset(&xe->drm, pc_fini, pc);
-	if (err)
-		return err;
-
 	return 0;
 }

drivers/gpu/drm/xe/xe_guc_pc.h

@@ -9,6 +9,7 @@
 #include "xe_guc_pc_types.h"
 
 int xe_guc_pc_init(struct xe_guc_pc *pc);
+void xe_guc_pc_fini(struct xe_guc_pc *pc);
 int xe_guc_pc_start(struct xe_guc_pc *pc);
 int xe_guc_pc_stop(struct xe_guc_pc *pc);
 int xe_guc_pc_gucrc_disable(struct xe_guc_pc *pc);

drivers/gpu/drm/xe/xe_uc.c

@@ -167,6 +167,11 @@ int xe_uc_init_hw(struct xe_uc *uc)
 	return 0;
 }
 
+int xe_uc_fini_hw(struct xe_uc *uc)
+{
+	return xe_uc_sanitize_reset(uc);
+}
+
 int xe_uc_reset_prepare(struct xe_uc *uc)
 {
 	/* GuC submission not enabled, nothing to do */

drivers/gpu/drm/xe/xe_uc.h

@@ -12,6 +12,7 @@ int xe_uc_init(struct xe_uc *uc);
 int xe_uc_init_hwconfig(struct xe_uc *uc);
 int xe_uc_init_post_hwconfig(struct xe_uc *uc);
 int xe_uc_init_hw(struct xe_uc *uc);
+int xe_uc_fini_hw(struct xe_uc *uc);
 void xe_uc_gucrc_disable(struct xe_uc *uc);
 int xe_uc_reset_prepare(struct xe_uc *uc);
 void xe_uc_stop_prepare(struct xe_uc *uc);