cxgb4: Added support in debugfs to dump PM module stats

Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 135 insertions, 0 deletions

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h b/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h
index da94b9a2f347..d98a44637896 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h
@@ -1054,6 +1054,8 @@ int t4_mc_read(struct adapter *adap, int idx, u32 addr, __be32 *data,
                u64 *parity);
 int t4_edc_read(struct adapter *adap, int idx, u32 addr, __be32 *data,
                 u64 *parity);
+void t4_pmtx_get_stats(struct adapter *adap, u32 cnt[], u64 cycles[]);
+void t4_pmrx_get_stats(struct adapter *adap, u32 cnt[], u64 cycles[]);
 int t4_read_cim_ibq(struct adapter *adap, unsigned int qid, u32 *data,
                     size_t n);
 int t4_read_cim_obq(struct adapter *adap, unsigned int qid, u32 *data,
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
index 4619bb3ff990..df90c78fb6cc 100644
--- 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
diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
index a3d2f31439c4..ea16c623e8b2 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
@@ -2512,6 +2512,60 @@ void t4_load_mtus(struct adapter *adap, const unsigned short *mtus,
 }
 
 /**
+ *      t4_pmtx_get_stats - returns the HW stats from PMTX
+ *      @adap: the adapter
+ *      @cnt: where to store the count statistics
+ *      @cycles: where to store the cycle statistics
+ *
+ *      Returns performance statistics from PMTX.
+ */
+void t4_pmtx_get_stats(struct adapter *adap, u32 cnt[], u64 cycles[])
+{
+        int i;
+        u32 data[2];
+
+        for (i = 0; i < PM_NSTATS; i++) {
+                t4_write_reg(adap, PM_TX_STAT_CONFIG_A, i + 1);
+                cnt[i] = t4_read_reg(adap, PM_TX_STAT_COUNT_A);
+                if (is_t4(adap->params.chip)) {
+                        cycles[i] = t4_read_reg64(adap, PM_TX_STAT_LSB_A);
+                } else {
+                        t4_read_indirect(adap, PM_TX_DBG_CTRL_A,
+                                         PM_TX_DBG_DATA_A, data, 2,
+                                         PM_TX_DBG_STAT_MSB_A);
+                        cycles[i] = (((u64)data[0] << 32) | data[1]);
+                }
+        }
+}
+
+/**
+ *      t4_pmrx_get_stats - returns the HW stats from PMRX
+ *      @adap: the adapter
+ *      @cnt: where to store the count statistics
+ *      @cycles: where to store the cycle statistics
+ *
+ *      Returns performance statistics from PMRX.
+ */
+void t4_pmrx_get_stats(struct adapter *adap, u32 cnt[], u64 cycles[])
+{
+        int i;
+        u32 data[2];
+
+        for (i = 0; i < PM_NSTATS; i++) {
+                t4_write_reg(adap, PM_RX_STAT_CONFIG_A, i + 1);
+                cnt[i] = t4_read_reg(adap, PM_RX_STAT_COUNT_A);
+                if (is_t4(adap->params.chip)) {
+                        cycles[i] = t4_read_reg64(adap, PM_RX_STAT_LSB_A);
+                } else {
+                        t4_read_indirect(adap, PM_RX_DBG_CTRL_A,
+                                         PM_RX_DBG_DATA_A, data, 2,
+                                         PM_RX_DBG_STAT_MSB_A);
+                        cycles[i] = (((u64)data[0] << 32) | data[1]);
+                }
+        }
+}
+
+/**
  *      get_mps_bg_map - return the buffer groups associated with a port
  *      @adap: the adapter
  *      @idx: the port index
diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.h b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.h
index f9fb81e4826e..664375f290ee 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.h
+++ b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.h
@@ -48,6 +48,7 @@ enum {
         NMTUS          = 16,    /* size of MTU table */
         NCCTRL_WIN     = 32,    /* # of congestion control windows */
         L2T_SIZE       = 4096,  /* # of L2T entries */
+        PM_NSTATS      = 5,     /* # of PM stats */
         MBOX_LEN       = 64,    /* mailbox size in bytes */
         TRACE_LEN      = 112,   /* length of trace data and mask */
         FILTER_OPT_LEN = 36,    /* filter tuple width for optional components */
diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h b/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h
index 1b1560acde2e..7aa0db137df6 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h
+++ b/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h
@@ -1380,6 +1380,12 @@
 #define PBL_BOUND_ERR_CH0_F    PBL_BOUND_ERR_CH0_V(1U)
 
 #define PM_RX_INT_CAUSE_A       0x8fdc
+#define PM_RX_STAT_CONFIG_A 0x8fc8
+#define PM_RX_STAT_COUNT_A 0x8fcc
+#define PM_RX_STAT_LSB_A 0x8fd0
+#define PM_RX_DBG_CTRL_A 0x8fd0
+#define PM_RX_DBG_DATA_A 0x8fd4
+#define PM_RX_DBG_STAT_MSB_A 0x10013
 
 #define PMRX_FRAMING_ERROR_F    0x003ffff0U
 
@@ -1404,6 +1410,12 @@
 #define PMRX_E_PCMD_PAR_ERROR_F    PMRX_E_PCMD_PAR_ERROR_V(1U)
 
 #define PM_TX_INT_CAUSE_A       0x8ffc
+#define PM_TX_STAT_CONFIG_A 0x8fe8
+#define PM_TX_STAT_COUNT_A 0x8fec
+#define PM_TX_STAT_LSB_A 0x8ff0
+#define PM_TX_DBG_CTRL_A 0x8ff0
+#define PM_TX_DBG_DATA_A 0x8ff4
+#define PM_TX_DBG_STAT_MSB_A 0x1001a
 
 #define PCMD_LEN_OVFL0_S    31
 #define PCMD_LEN_OVFL0_V(x) ((x) << PCMD_LEN_OVFL0_S)