1 files changed, 444 insertions, 0 deletions

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_coredump.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_coredump.c
new file mode 100644
index 000000000000..c06789882036
--- /dev/null
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_coredump.c
@@ -0,0 +1,444 @@
+/* Broadcom NetXtreme-C/E network driver.
+ *
+ * Copyright (c) 2021 Broadcom Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/pci.h>
+#include "bnxt_hsi.h"
+#include "bnxt.h"
+#include "bnxt_hwrm.h"
+#include "bnxt_coredump.h"
+
+static int bnxt_hwrm_dbg_dma_data(struct bnxt *bp, void *msg,
+				  struct bnxt_hwrm_dbg_dma_info *info)
+{
+	struct hwrm_dbg_cmn_input *cmn_req = msg;
+	__le16 *seq_ptr = msg + info->seq_off;
+	struct hwrm_dbg_cmn_output *cmn_resp;
+	u16 seq = 0, len, segs_off;
+	dma_addr_t dma_handle;
+	void *dma_buf, *resp;
+	int rc, off = 0;
+
+	dma_buf = hwrm_req_dma_slice(bp, msg, info->dma_len, &dma_handle);
+	if (!dma_buf) {
+		hwrm_req_drop(bp, msg);
+		return -ENOMEM;
+	}
+
+	hwrm_req_timeout(bp, msg, bp->hwrm_cmd_max_timeout);
+	cmn_resp = hwrm_req_hold(bp, msg);
+	resp = cmn_resp;
+
+	segs_off = offsetof(struct hwrm_dbg_coredump_list_output,
+			    total_segments);
+	cmn_req->host_dest_addr = cpu_to_le64(dma_handle);
+	cmn_req->host_buf_len = cpu_to_le32(info->dma_len);
+	while (1) {
+		*seq_ptr = cpu_to_le16(seq);
+		rc = hwrm_req_send(bp, msg);
+		if (rc)
+			break;
+
+		len = le16_to_cpu(*((__le16 *)(resp + info->data_len_off)));
+		if (!seq &&
+		    cmn_req->req_type == cpu_to_le16(HWRM_DBG_COREDUMP_LIST)) {
+			info->segs = le16_to_cpu(*((__le16 *)(resp +
+							      segs_off)));
+			if (!info->segs) {
+				rc = -EIO;
+				break;
+			}
+
+			info->dest_buf_size = info->segs *
+					sizeof(struct coredump_segment_record);
+			info->dest_buf = kmalloc(info->dest_buf_size,
+						 GFP_KERNEL);
+			if (!info->dest_buf) {
+				rc = -ENOMEM;
+				break;
+			}
+		}
+
+		if (info->dest_buf) {
+			if ((info->seg_start + off + len) <=
+			    BNXT_COREDUMP_BUF_LEN(info->buf_len)) {
+				memcpy(info->dest_buf + off, dma_buf, len);
+			} else {
+				rc = -ENOBUFS;
+				break;
+			}
+		}
+
+		if (cmn_req->req_type ==
+				cpu_to_le16(HWRM_DBG_COREDUMP_RETRIEVE))
+			info->dest_buf_size += len;
+
+		if (!(cmn_resp->flags & HWRM_DBG_CMN_FLAGS_MORE))
+			break;
+
+		seq++;
+		off += len;
+	}
+	hwrm_req_drop(bp, msg);
+	return rc;
+}
+
+static int bnxt_hwrm_dbg_coredump_list(struct bnxt *bp,
+				       struct bnxt_coredump *coredump)
+{
+	struct bnxt_hwrm_dbg_dma_info info = {NULL};
+	struct hwrm_dbg_coredump_list_input *req;
+	int rc;
+
+	rc = hwrm_req_init(bp, req, HWRM_DBG_COREDUMP_LIST);
+	if (rc)
+		return rc;
+
+	info.dma_len = COREDUMP_LIST_BUF_LEN;
+	info.seq_off = offsetof(struct hwrm_dbg_coredump_list_input, seq_no);
+	info.data_len_off = offsetof(struct hwrm_dbg_coredump_list_output,
+				     data_len);
+
+	rc = bnxt_hwrm_dbg_dma_data(bp, req, &info);
+	if (!rc) {
+		coredump->data = info.dest_buf;
+		coredump->data_size = info.dest_buf_size;
+		coredump->total_segs = info.segs;
+	}
+	return rc;
+}
+
+static int bnxt_hwrm_dbg_coredump_initiate(struct bnxt *bp, u16 component_id,
+					   u16 segment_id)
+{
+	struct hwrm_dbg_coredump_initiate_input *req;
+	int rc;
+
+	rc = hwrm_req_init(bp, req, HWRM_DBG_COREDUMP_INITIATE);
+	if (rc)
+		return rc;
+
+	hwrm_req_timeout(bp, req, bp->hwrm_cmd_max_timeout);
+	req->component_id = cpu_to_le16(component_id);
+	req->segment_id = cpu_to_le16(segment_id);
+
+	return hwrm_req_send(bp, req);
+}
+
+static int bnxt_hwrm_dbg_coredump_retrieve(struct bnxt *bp, u16 component_id,
+					   u16 segment_id, u32 *seg_len,
+					   void *buf, u32 buf_len, u32 offset)
+{
+	struct hwrm_dbg_coredump_retrieve_input *req;
+	struct bnxt_hwrm_dbg_dma_info info = {NULL};
+	int rc;
+
+	rc = hwrm_req_init(bp, req, HWRM_DBG_COREDUMP_RETRIEVE);
+	if (rc)
+		return rc;
+
+	req->component_id = cpu_to_le16(component_id);
+	req->segment_id = cpu_to_le16(segment_id);
+
+	info.dma_len = COREDUMP_RETRIEVE_BUF_LEN;
+	info.seq_off = offsetof(struct hwrm_dbg_coredump_retrieve_input,
+				seq_no);
+	info.data_len_off = offsetof(struct hwrm_dbg_coredump_retrieve_output,
+				     data_len);
+	if (buf) {
+		info.dest_buf = buf + offset;
+		info.buf_len = buf_len;
+		info.seg_start = offset;
+	}
+
+	rc = bnxt_hwrm_dbg_dma_data(bp, req, &info);
+	if (!rc)
+		*seg_len = info.dest_buf_size;
+
+	return rc;
+}
+
+static void
+bnxt_fill_coredump_seg_hdr(struct bnxt *bp,
+			   struct bnxt_coredump_segment_hdr *seg_hdr,
+			   struct coredump_segment_record *seg_rec, u32 seg_len,
+			   int status, u32 duration, u32 instance)
+{
+	memset(seg_hdr, 0, sizeof(*seg_hdr));
+	memcpy(seg_hdr->signature, "sEgM", 4);
+	if (seg_rec) {
+		seg_hdr->component_id = (__force __le32)seg_rec->component_id;
+		seg_hdr->segment_id = (__force __le32)seg_rec->segment_id;
+		seg_hdr->low_version = seg_rec->version_low;
+		seg_hdr->high_version = seg_rec->version_hi;
+		seg_hdr->flags = cpu_to_le32(seg_rec->compress_flags);
+	} else {
+		/* For hwrm_ver_get response Component id = 2
+		 * and Segment id = 0
+		 */
+		seg_hdr->component_id = cpu_to_le32(2);
+		seg_hdr->segment_id = 0;
+	}
+	seg_hdr->function_id = cpu_to_le16(bp->pdev->devfn);
+	seg_hdr->length = cpu_to_le32(seg_len);
+	seg_hdr->status = cpu_to_le32(status);
+	seg_hdr->duration = cpu_to_le32(duration);
+	seg_hdr->data_offset = cpu_to_le32(sizeof(*seg_hdr));
+	seg_hdr->instance = cpu_to_le32(instance);
+}
+
+static void bnxt_fill_cmdline(struct bnxt_coredump_record *record)
+{
+	struct mm_struct *mm = current->mm;
+	int i, len, last = 0;
+
+	if (mm) {
+		len = min_t(int, mm->arg_end - mm->arg_start,
+			    sizeof(record->commandline) - 1);
+		if (len && !copy_from_user(record->commandline,
+					   (char __user *)mm->arg_start, len)) {
+			for (i = 0; i < len; i++) {
+				if (record->commandline[i])
+					last = i;
+				else
+					record->commandline[i] = ' ';
+			}
+			record->commandline[last + 1] = 0;
+			return;
+		}
+	}
+
+	strscpy(record->commandline, current->comm, TASK_COMM_LEN);
+}
+
+static void
+bnxt_fill_coredump_record(struct bnxt *bp, struct bnxt_coredump_record *record,
+			  time64_t start, s16 start_utc, u16 total_segs,
+			  int status)
+{
+	time64_t end = ktime_get_real_seconds();
+	u32 os_ver_major = 0, os_ver_minor = 0;
+	struct tm tm;
+
+	time64_to_tm(start, 0, &tm);
+	memset(record, 0, sizeof(*record));
+	memcpy(record->signature, "cOrE", 4);
+	record->flags = 0;
+	record->low_version = 0;
+	record->high_version = 1;
+	record->asic_state = 0;
+	strscpy(record->system_name, utsname()->nodename,
+		sizeof(record->system_name));
+	record->year = cpu_to_le16(tm.tm_year + 1900);
+	record->month = cpu_to_le16(tm.tm_mon + 1);
+	record->day = cpu_to_le16(tm.tm_mday);
+	record->hour = cpu_to_le16(tm.tm_hour);
+	record->minute = cpu_to_le16(tm.tm_min);
+	record->second = cpu_to_le16(tm.tm_sec);
+	record->utc_bias = cpu_to_le16(start_utc);
+	bnxt_fill_cmdline(record);
+	record->total_segments = cpu_to_le32(total_segs);
+
+	if (sscanf(utsname()->release, "%u.%u", &os_ver_major, &os_ver_minor) != 2)
+		netdev_warn(bp->dev, "Unknown OS release in coredump\n");
+	record->os_ver_major = cpu_to_le32(os_ver_major);
+	record->os_ver_minor = cpu_to_le32(os_ver_minor);
+
+	strscpy(record->os_name, utsname()->sysname, sizeof(record->os_name));
+	time64_to_tm(end, 0, &tm);
+	record->end_year = cpu_to_le16(tm.tm_year + 1900);
+	record->end_month = cpu_to_le16(tm.tm_mon + 1);
+	record->end_day = cpu_to_le16(tm.tm_mday);
+	record->end_hour = cpu_to_le16(tm.tm_hour);
+	record->end_minute = cpu_to_le16(tm.tm_min);
+	record->end_second = cpu_to_le16(tm.tm_sec);
+	record->end_utc_bias = cpu_to_le16(sys_tz.tz_minuteswest * 60);
+	record->asic_id1 = cpu_to_le32(bp->chip_num << 16 |
+				       bp->ver_resp.chip_rev << 8 |
+				       bp->ver_resp.chip_metal);
+	record->asic_id2 = 0;
+	record->coredump_status = cpu_to_le32(status);
+	record->ioctl_low_version = 0;
+	record->ioctl_high_version = 0;
+}
+
+static int __bnxt_get_coredump(struct bnxt *bp, void *buf, u32 *dump_len)
+{
+	u32 ver_get_resp_len = sizeof(struct hwrm_ver_get_output);
+	u32 offset = 0, seg_hdr_len, seg_record_len, buf_len = 0;
+	struct coredump_segment_record *seg_record = NULL;
+	struct bnxt_coredump_segment_hdr seg_hdr;
+	struct bnxt_coredump coredump = {NULL};
+	time64_t start_time;
+	u16 start_utc;
+	int rc = 0, i;
+
+	if (buf)
+		buf_len = *dump_len;
+
+	start_time = ktime_get_real_seconds();
+	start_utc = sys_tz.tz_minuteswest * 60;
+	seg_hdr_len = sizeof(seg_hdr);
+
+	/* First segment should be hwrm_ver_get response */
+	*dump_len = seg_hdr_len + ver_get_resp_len;
+	if (buf) {
+		bnxt_fill_coredump_seg_hdr(bp, &seg_hdr, NULL, ver_get_resp_len,
+					   0, 0, 0);
+		memcpy(buf + offset, &seg_hdr, seg_hdr_len);
+		offset += seg_hdr_len;
+		memcpy(buf + offset, &bp->ver_resp, ver_get_resp_len);
+		offset += ver_get_resp_len;
+	}
+
+	rc = bnxt_hwrm_dbg_coredump_list(bp, &coredump);
+	if (rc) {
+		netdev_err(bp->dev, "Failed to get coredump segment list\n");
+		goto err;
+	}
+
+	*dump_len += seg_hdr_len * coredump.total_segs;
+
+	seg_record = (struct coredump_segment_record *)coredump.data;
+	seg_record_len = sizeof(*seg_record);
+
+	for (i = 0; i < coredump.total_segs; i++) {
+		u16 comp_id = le16_to_cpu(seg_record->component_id);
+		u16 seg_id = le16_to_cpu(seg_record->segment_id);
+		u32 duration = 0, seg_len = 0;
+		unsigned long start, end;
+
+		if (buf && ((offset + seg_hdr_len) >
+			    BNXT_COREDUMP_BUF_LEN(buf_len))) {
+			rc = -ENOBUFS;
+			goto err;
+		}
+
+		start = jiffies;
+
+		rc = bnxt_hwrm_dbg_coredump_initiate(bp, comp_id, seg_id);
+		if (rc) {
+			netdev_err(bp->dev,
+				   "Failed to initiate coredump for seg = %d\n",
+				   seg_record->segment_id);
+			goto next_seg;
+		}
+
+		/* Write segment data into the buffer */
+		rc = bnxt_hwrm_dbg_coredump_retrieve(bp, comp_id, seg_id,
+						     &seg_len, buf, buf_len,
+						     offset + seg_hdr_len);
+		if (rc && rc == -ENOBUFS)
+			goto err;
+		else if (rc)
+			netdev_err(bp->dev,
+				   "Failed to retrieve coredump for seg = %d\n",
+				   seg_record->segment_id);
+
+next_seg:
+		end = jiffies;
+		duration = jiffies_to_msecs(end - start);
+		bnxt_fill_coredump_seg_hdr(bp, &seg_hdr, seg_record, seg_len,
+					   rc, duration, 0);
+
+		if (buf) {
+			/* Write segment header into the buffer */
+			memcpy(buf + offset, &seg_hdr, seg_hdr_len);
+			offset += seg_hdr_len + seg_len;
+		}
+
+		*dump_len += seg_len;
+		seg_record =
+			(struct coredump_segment_record *)((u8 *)seg_record +
+							   seg_record_len);
+	}
+
+err:
+	if (buf)
+		bnxt_fill_coredump_record(bp, buf + offset, start_time,
+					  start_utc, coredump.total_segs + 1,
+					  rc);
+	kfree(coredump.data);
+	*dump_len += sizeof(struct bnxt_coredump_record);
+	if (rc == -ENOBUFS)
+		netdev_err(bp->dev, "Firmware returned large coredump buffer\n");
+	return rc;
+}
+
+int bnxt_get_coredump(struct bnxt *bp, u16 dump_type, void *buf, u32 *dump_len)
+{
+	if (dump_type == BNXT_DUMP_CRASH) {
+#ifdef CONFIG_TEE_BNXT_FW
+		return tee_bnxt_copy_coredump(buf, 0, *dump_len);
+#else
+		return -EOPNOTSUPP;
+#endif
+	} else {
+		return __bnxt_get_coredump(bp, buf, dump_len);
+	}
+}
+
+static int bnxt_hwrm_get_dump_len(struct bnxt *bp, u16 dump_type, u32 *dump_len)
+{
+	struct hwrm_dbg_qcfg_output *resp;
+	struct hwrm_dbg_qcfg_input *req;
+	int rc, hdr_len = 0;
+
+	if (!(bp->fw_cap & BNXT_FW_CAP_DBG_QCAPS))
+		return -EOPNOTSUPP;
+
+	if (dump_type == BNXT_DUMP_CRASH &&
+	    !(bp->fw_dbg_cap & DBG_QCAPS_RESP_FLAGS_CRASHDUMP_SOC_DDR))
+		return -EOPNOTSUPP;
+
+	rc = hwrm_req_init(bp, req, HWRM_DBG_QCFG);
+	if (rc)
+		return rc;
+
+	req->fid = cpu_to_le16(0xffff);
+	if (dump_type == BNXT_DUMP_CRASH)
+		req->flags = cpu_to_le16(DBG_QCFG_REQ_FLAGS_CRASHDUMP_SIZE_FOR_DEST_DEST_SOC_DDR);
+
+	resp = hwrm_req_hold(bp, req);
+	rc = hwrm_req_send(bp, req);
+	if (rc)
+		goto get_dump_len_exit;
+
+	if (dump_type == BNXT_DUMP_CRASH) {
+		*dump_len = le32_to_cpu(resp->crashdump_size);
+	} else {
+		/* Driver adds coredump header and "HWRM_VER_GET response"
+		 * segment additionally to coredump.
+		 */
+		hdr_len = sizeof(struct bnxt_coredump_segment_hdr) +
+		sizeof(struct hwrm_ver_get_output) +
+		sizeof(struct bnxt_coredump_record);
+		*dump_len = le32_to_cpu(resp->coredump_size) + hdr_len;
+	}
+	if (*dump_len <= hdr_len)
+		rc = -EINVAL;
+
+get_dump_len_exit:
+	hwrm_req_drop(bp, req);
+	return rc;
+}
+
+u32 bnxt_get_coredump_length(struct bnxt *bp, u16 dump_type)
+{
+	u32 len = 0;
+
+	if (bnxt_hwrm_get_dump_len(bp, dump_type, &len)) {
+		if (dump_type == BNXT_DUMP_CRASH)
+			len = BNXT_CRASH_DUMP_LEN;
+		else
+			__bnxt_get_coredump(bp, NULL, &len);
+	}
+	return len;
+}