qed: implement devlink dump

Gather and push out full device dump to devlink.
Device dump is the same as with `ethtool -d`, but now its generated
exactly at the moment bad thing happens.
Signed-off-by: Igor Russkikh <irusskikh@marvell.com>
Signed-off-by: Alexander Lobakin <alobakin@marvell.com>
Signed-off-by: Michal Kalderon <michal.kalderon@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/qlogic/qed/qed_devlink.c

@@ -6,6 +6,7 @@
 
 #include <linux/kernel.h>
 #include <linux/qed/qed_if.h>
+#include <linux/vmalloc.h>
 #include "qed.h"
 #include "qed_devlink.h"
 
@@ -32,6 +33,47 @@ int qed_report_fatal_error(struct devlink *devlink, enum qed_hw_err_type err_typ
 	return 0;
 }
 
+static int
+qed_fw_fatal_reporter_dump(struct devlink_health_reporter *reporter,
+			   struct devlink_fmsg *fmsg, void *priv_ctx,
+			   struct netlink_ext_ack *extack)
+{
+	struct qed_devlink *qdl = devlink_health_reporter_priv(reporter);
+	struct qed_fw_fatal_ctx *fw_fatal_ctx = priv_ctx;
+	struct qed_dev *cdev = qdl->cdev;
+	u32 dbg_data_buf_size;
+	u8 *p_dbg_data_buf;
+	int err;
+
+	/* Having context means that was a dump request after fatal,
+	 * so we enable extra debugging while gathering the dump,
+	 * just in case
+	 */
+	cdev->print_dbg_data = fw_fatal_ctx ? true : false;
+
+	dbg_data_buf_size = qed_dbg_all_data_size(cdev);
+	p_dbg_data_buf = vzalloc(dbg_data_buf_size);
+	if (!p_dbg_data_buf) {
+		DP_NOTICE(cdev,
+			  "Failed to allocate memory for a debug data buffer\n");
+		return -ENOMEM;
+	}
+
+	err = qed_dbg_all_data(cdev, p_dbg_data_buf);
+	if (err) {
+		DP_NOTICE(cdev, "Failed to obtain debug data\n");
+		vfree(p_dbg_data_buf);
+		return err;
+	}
+
+	err = devlink_fmsg_binary_pair_put(fmsg, "dump_data",
+					   p_dbg_data_buf, dbg_data_buf_size);
+
+	vfree(p_dbg_data_buf);
+
+	return err;
+}
+
 static int
 qed_fw_fatal_reporter_recover(struct devlink_health_reporter *reporter,
 			      void *priv_ctx,
@@ -48,6 +90,7 @@ qed_fw_fatal_reporter_recover(struct devlink_health_reporter *reporter,
 static const struct devlink_health_reporter_ops qed_fw_fatal_reporter_ops = {
 		.name = "fw_fatal",
 		.recover = qed_fw_fatal_reporter_recover,
+		.dump = qed_fw_fatal_reporter_dump,
 };
 
 #define QED_REPORTER_FW_GRACEFUL_PERIOD 1200000