cxgb4: Added support in debugfs to dump PM module stats

[thirdparty/kernel/stable.git] / drivers / net / ethernet / chelsio / cxgb4 / cxgb4_debugfs.c

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
index 4619bb3ff990bd0a002fd3e1b74314350f5e66c6..df90c78fb6cc471878bbb7d593547b874649a867 100644 (file)
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
@@ -315,6 +315,71 @@ static const struct file_operations cim_obq_fops = {
        .release = seq_release_private
 };
 
+/* Show the PM memory stats.  These stats include:
+ *
+ * TX:
+ *   Read: memory read operation
+ *   Write Bypass: cut-through
+ *   Bypass + mem: cut-through and save copy
+ *
+ * RX:
+ *   Read: memory read
+ *   Write Bypass: cut-through
+ *   Flush: payload trim or drop
+ */
+static int pm_stats_show(struct seq_file *seq, void *v)
+{
+       static const char * const tx_pm_stats[] = {
+               "Read:", "Write bypass:", "Write mem:", "Bypass + mem:"
+       };
+       static const char * const rx_pm_stats[] = {
+               "Read:", "Write bypass:", "Write mem:", "Flush:"
+       };
+
+       int i;
+       u32 tx_cnt[PM_NSTATS], rx_cnt[PM_NSTATS];
+       u64 tx_cyc[PM_NSTATS], rx_cyc[PM_NSTATS];
+       struct adapter *adap = seq->private;
+
+       t4_pmtx_get_stats(adap, tx_cnt, tx_cyc);
+       t4_pmrx_get_stats(adap, rx_cnt, rx_cyc);
+
+       seq_printf(seq, "%13s %10s  %20s\n", " ", "Tx pcmds", "Tx bytes");
+       for (i = 0; i < PM_NSTATS - 1; i++)
+               seq_printf(seq, "%-13s %10u  %20llu\n",
+                          tx_pm_stats[i], tx_cnt[i], tx_cyc[i]);
+
+       seq_printf(seq, "%13s %10s  %20s\n", " ", "Rx pcmds", "Rx bytes");
+       for (i = 0; i < PM_NSTATS - 1; i++)
+               seq_printf(seq, "%-13s %10u  %20llu\n",
+                          rx_pm_stats[i], rx_cnt[i], rx_cyc[i]);
+       return 0;
+}
+
+static int pm_stats_open(struct inode *inode, struct file *file)
+{
+       return single_open(file, pm_stats_show, inode->i_private);
+}
+
+static ssize_t pm_stats_clear(struct file *file, const char __user *buf,
+                             size_t count, loff_t *pos)
+{
+       struct adapter *adap = FILE_DATA(file)->i_private;
+
+       t4_write_reg(adap, PM_RX_STAT_CONFIG_A, 0);
+       t4_write_reg(adap, PM_TX_STAT_CONFIG_A, 0);
+       return count;
+}
+
+static const struct file_operations pm_stats_debugfs_fops = {
+       .owner   = THIS_MODULE,
+       .open    = pm_stats_open,
+       .read    = seq_read,
+       .llseek  = seq_lseek,
+       .release = single_release,
+       .write   = pm_stats_clear
+};
+
 /* Firmware Device Log dump. */
 static const char * const devlog_level_strings[] = {
        [FW_DEVLOG_LEVEL_EMERG]         = "EMERG",
@@ -1434,6 +1499,7 @@ int t4_setup_debugfs(struct adapter *adap)
                { "obq_ulp3", &cim_obq_fops, S_IRUSR, 3 },
                { "obq_sge",  &cim_obq_fops, S_IRUSR, 4 },
                { "obq_ncsi", &cim_obq_fops, S_IRUSR, 5 },
+               { "pm_stats", &pm_stats_debugfs_fops, S_IRUSR, 0 },
 #if IS_ENABLED(CONFIG_IPV6)
                { "clip_tbl", &clip_tbl_debugfs_fops, S_IRUSR, 0 },
 #endif