drm/imagination: Implement handling of context reset notification

The firmware will send the context reset notification message as
part of handling hardware recovery (HWR) events deecoding the message
and printing via drm_info(). This eliminates the "Unknown FWCCB command"
message that was previously printed.

Co-developed-by: Sarah Walker <sarah.walker@imgtec.com>
Signed-off-by: Sarah Walker <sarah.walker@imgtec.com>
Signed-off-by: Alexandru Dadu <alexandru.dadu@imgtec.com>
Reviewed-by: Matt Coster <matt.coster@imgtec.com>
Link: https://patch.msgid.link/20260323-b4-firmware-context-reset-notification-handling-v3-3-1a66049a9a65@imgtec.com
Signed-off-by: Matt Coster <matt.coster@imgtec.com>

drivers/gpu/drm/imagination/Makefile

@@ -8,6 +8,7 @@ powervr-y := \
 	pvr_device.o \
 	pvr_device_info.o \
 	pvr_drv.o \
+	pvr_dump.o \
 	pvr_free_list.o \
 	pvr_fw.o \
 	pvr_fw_meta.o \

drivers/gpu/drm/imagination/pvr_ccb.c

@@ -4,6 +4,7 @@
 #include "pvr_ccb.h"
 #include "pvr_device.h"
 #include "pvr_drv.h"
+#include "pvr_dump.h"
 #include "pvr_free_list.h"
 #include "pvr_fw.h"
 #include "pvr_gem.h"
@@ -165,6 +166,10 @@ process_fwccb_command(struct pvr_device *pvr_dev, struct rogue_fwif_fwccb_cmd *c
 		 * suppress the "unknown" warning when receiving this command.
 		 */
 		break;
+	case ROGUE_FWIF_FWCCB_CMD_CONTEXT_RESET_NOTIFICATION:
+		pvr_dump_context_reset_notification(pvr_dev,
+						    &cmd->cmd_data.cmd_context_reset_notification);
+		break;
 
 	default:
 		drm_info(drm_dev, "Received unknown FWCCB command (type=%d)\n",

drivers/gpu/drm/imagination/pvr_dump.c

@@ -0,0 +1,113 @@
+// SPDX-License-Identifier: GPL-2.0 OR MIT
+/* Copyright (c) 2026 Imagination Technologies Ltd. */
+
+#include "pvr_device.h"
+#include "pvr_dump.h"
+#include "pvr_rogue_fwif.h"
+
+#include <drm/drm_print.h>
+#include <linux/types.h>
+
+static const char *
+get_reset_reason_desc(enum rogue_context_reset_reason reason)
+{
+	switch (reason) {
+	case ROGUE_CONTEXT_RESET_REASON_NONE:
+		return "None";
+	case ROGUE_CONTEXT_RESET_REASON_GUILTY_LOCKUP:
+		return "Guilty lockup";
+	case ROGUE_CONTEXT_RESET_REASON_INNOCENT_LOCKUP:
+		return "Innocent lockup";
+	case ROGUE_CONTEXT_RESET_REASON_GUILTY_OVERRUNING:
+		return "Guilty overrunning";
+	case ROGUE_CONTEXT_RESET_REASON_INNOCENT_OVERRUNING:
+		return "Innocent overrunning";
+	case ROGUE_CONTEXT_RESET_REASON_HARD_CONTEXT_SWITCH:
+		return "Hard context switch";
+	case ROGUE_CONTEXT_RESET_REASON_WGP_CHECKSUM:
+		return "CDM Mission/safety checksum mismatch";
+	case ROGUE_CONTEXT_RESET_REASON_TRP_CHECKSUM:
+		return "TRP checksum mismatch";
+	case ROGUE_CONTEXT_RESET_REASON_GPU_ECC_OK:
+		return "GPU ECC error (corrected, OK)";
+	case ROGUE_CONTEXT_RESET_REASON_GPU_ECC_HWR:
+		return "GPU ECC error (uncorrected, HWR)";
+	case ROGUE_CONTEXT_RESET_REASON_FW_ECC_OK:
+		return "Firmware ECC error (corrected, OK)";
+	case ROGUE_CONTEXT_RESET_REASON_FW_ECC_ERR:
+		return "Firmware ECC error (uncorrected, ERR)";
+	case ROGUE_CONTEXT_RESET_REASON_FW_WATCHDOG:
+		return "Firmware watchdog";
+	case ROGUE_CONTEXT_RESET_REASON_FW_PAGEFAULT:
+		return "Firmware pagefault";
+	case ROGUE_CONTEXT_RESET_REASON_FW_EXEC_ERR:
+		return "Firmware execution error";
+	case ROGUE_CONTEXT_RESET_REASON_HOST_WDG_FW_ERR:
+		return "Host watchdog";
+	case ROGUE_CONTEXT_GEOM_OOM_DISABLED:
+		return "Geometry OOM disabled";
+
+	default:
+		return "Unknown";
+	}
+}
+
+static const char *
+get_dm_name(u32 dm)
+{
+	switch (dm) {
+	case PVR_FWIF_DM_GP:
+		return "General purpose";
+	/* PVR_FWIF_DM_TDM has the same index, but is discriminated by a device feature */
+	case PVR_FWIF_DM_2D:
+		return "2D or TDM";
+	case PVR_FWIF_DM_GEOM:
+		return "Geometry";
+	case PVR_FWIF_DM_FRAG:
+		return "Fragment";
+	case PVR_FWIF_DM_CDM:
+		return "Compute";
+	case PVR_FWIF_DM_RAY:
+		return "Raytracing";
+	case PVR_FWIF_DM_GEOM2:
+		return "Geometry 2";
+	case PVR_FWIF_DM_GEOM3:
+		return "Geometry 3";
+	case PVR_FWIF_DM_GEOM4:
+		return "Geometry 4";
+
+	default:
+		return "Unknown";
+	}
+}
+
+/**
+ * pvr_dump_context_reset_notification() - Handle context reset notification from FW
+ * @pvr_dev: Device pointer.
+ * @data: Data provided by FW.
+ *
+ * This will decode the data structure provided by FW and print the results via drm_info().
+ */
+void
+pvr_dump_context_reset_notification(struct pvr_device *pvr_dev,
+				    struct rogue_fwif_fwccb_cmd_context_reset_data *data)
+{
+	struct drm_device *drm_dev = from_pvr_device(pvr_dev);
+
+	if (data->flags & ROGUE_FWIF_FWCCB_CMD_CONTEXT_RESET_FLAG_ALL_CTXS) {
+		drm_info(drm_dev, "Received context reset notification for all contexts\n");
+	} else {
+		drm_info(drm_dev, "Received context reset notification on context %u\n",
+			 data->server_common_context_id);
+	}
+
+	drm_info(drm_dev, "  Reset reason=%u (%s)\n", data->reset_reason,
+		 get_reset_reason_desc((enum rogue_context_reset_reason)data->reset_reason));
+	drm_info(drm_dev, "  Data Master=%u (%s)\n", data->dm, get_dm_name(data->dm));
+	drm_info(drm_dev, "  Job ref=%u\n", data->reset_job_ref);
+
+	if (data->flags & ROGUE_FWIF_FWCCB_CMD_CONTEXT_RESET_FLAG_PF) {
+		drm_info(drm_dev, "  Page fault occurred, fault address=%llx\n",
+			 data->fault_address);
+	}
+}

drivers/gpu/drm/imagination/pvr_dump.h

@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 OR MIT */
+/* Copyright (c) 2026 Imagination Technologies Ltd. */
+
+#ifndef PVR_DUMP_H
+#define PVR_DUMP_H
+
+/* Forward declaration from pvr_device.h. */
+struct pvr_device;
+
+/* Forward declaration from pvr_rogue_fwif.h. */
+struct rogue_fwif_fwccb_cmd_context_reset_data;
+
+void
+pvr_dump_context_reset_notification(struct pvr_device *pvr_dev,
+				    struct rogue_fwif_fwccb_cmd_context_reset_data *data);
+
+#endif /* PVR_DUMP_H */