RDMA/bnxt_re: Add debugfs info entry for device and resource information

Add a new debugfs info entry that displays device information and
non-statistics data using the seq_file interface. This entry shows:

- Resource watermarks (peak usage tracking)
- Operational counters (CQ resize count)
- Doorbell pacing information

Link: https://patch.msgid.link/r/[email protected]
Signed-off-by: Anantha Prabhu <[email protected]>
Signed-off-by: Kalesh AP <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>

Author: anprabhu78

drivers/infiniband/hw/bnxt_re/debugfs.c

@@ -8,6 +8,7 @@
 
 #include <linux/debugfs.h>
 #include <linux/pci.h>
+#include <linux/seq_file.h>
 #include <rdma/ib_addr.h>
 
 #include "bnxt_ulp.h"
@@ -314,6 +315,40 @@ static const struct file_operations bnxt_re_cc_config_ops = {
 	.write = bnxt_re_cc_config_set,
 };
 
+static int info_show(struct seq_file *m, void *unused)
+{
+	struct bnxt_re_dev *rdev = m->private;
+	struct bnxt_re_res_cntrs *res_s = &rdev->stats.res;
+
+	seq_puts(m, "Info:\n");
+	seq_printf(m, "Device Name\t\t: %s\n", dev_name(&rdev->ibdev.dev));
+	seq_printf(m, "PD Watermark\t\t: %llu\n", res_s->pd_watermark);
+	seq_printf(m, "AH Watermark\t\t: %llu\n", res_s->ah_watermark);
+	seq_printf(m, "QP Watermark\t\t: %llu\n", res_s->qp_watermark);
+	seq_printf(m, "RC QP Watermark\t\t: %llu\n", res_s->rc_qp_watermark);
+	seq_printf(m, "UD QP Watermark\t\t: %llu\n", res_s->ud_qp_watermark);
+	seq_printf(m, "SRQ Watermark\t\t: %llu\n", res_s->srq_watermark);
+	seq_printf(m, "CQ Watermark\t\t: %llu\n", res_s->cq_watermark);
+	seq_printf(m, "MR Watermark\t\t: %llu\n", res_s->mr_watermark);
+	seq_printf(m, "MW Watermark\t\t: %llu\n", res_s->mw_watermark);
+	seq_printf(m, "CQ Resize Count\t\t: %d\n", atomic_read(&res_s->resize_count));
+	if (rdev->pacing.dbr_pacing) {
+		seq_printf(m, "DB Pacing Reschedule\t: %llu\n", rdev->stats.pacing.resched);
+		seq_printf(m, "DB Pacing Complete\t: %llu\n", rdev->stats.pacing.complete);
+		seq_printf(m, "DB Pacing Alerts\t: %llu\n", rdev->stats.pacing.alerts);
+		seq_printf(m, "DB FIFO Register\t: 0x%x\n",
+			   readl(rdev->en_dev->bar0 + rdev->pacing.dbr_db_fifo_reg_off));
+	}
+
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(info);
+
+static void bnxt_re_debugfs_add_info(struct bnxt_re_dev *rdev)
+{
+	debugfs_create_file("info", 0400, rdev->dbg_root, rdev, &info_fops);
+}
+
 void bnxt_re_debugfs_add_pdev(struct bnxt_re_dev *rdev)
 {
 	struct pci_dev *pdev = rdev->en_dev->pdev;
@@ -325,6 +360,8 @@ void bnxt_re_debugfs_add_pdev(struct bnxt_re_dev *rdev)
 	rdev->qp_debugfs = debugfs_create_dir("QPs", rdev->dbg_root);
 	rdev->cc_config = debugfs_create_dir("cc_config", rdev->dbg_root);
 
+	bnxt_re_debugfs_add_info(rdev);
+
 	rdev->cc_config_params = kzalloc(sizeof(*cc_params), GFP_KERNEL);
 
 	for (i = 0; i < BNXT_RE_CC_PARAM_GEN0; i++) {