be2net: add code to dump registers for debug

when the BE device becomes unresponsive, dump the registers to help debugging

Signed-off-by: Somnath K <somnathk@serverengines.com>
Signed-off-by: Ajit Khaparde <ajitk@serverengines.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/benet/be.h b/drivers/net/benet/be.h
index e06369c..5e6f581 100644 (file)
--- a/drivers/net/benet/be.h
+++ b/drivers/net/benet/be.h
@@ -288,6 +288,7 @@ struct be_adapter {
        u32 function_mode;
        u32 rx_fc;              /* Rx flow control */
        u32 tx_fc;              /* Tx flow control */
+       bool ue_detected;
        int link_speed;
        u8 port_type;
        u8 transceiver;

diff --git a/drivers/net/benet/be_cmds.c b/drivers/net/benet/be_cmds.c
index 6eaf8a3..7fd860d 100644 (file)
--- a/drivers/net/benet/be_cmds.c
+++ b/drivers/net/benet/be_cmds.c
@@ -206,6 +206,7 @@ static int be_mbox_db_ready_wait(struct be_adapter *adapter, void __iomem *db)
 
                if (msecs > 4000) {
                        dev_err(&adapter->pdev->dev, "mbox poll timed out\n");
+                       be_dump_ue(adapter);
                        return -1;
                }
 

diff --git a/drivers/net/benet/be_cmds.h b/drivers/net/benet/be_cmds.h
index 036531c..bdc10a2 100644 (file)
--- a/drivers/net/benet/be_cmds.h
+++ b/drivers/net/benet/be_cmds.h
@@ -992,4 +992,5 @@ extern int be_cmd_set_loopback(struct be_adapter *adapter, u8 port_num,
 extern int be_cmd_get_phy_info(struct be_adapter *adapter,
                struct be_dma_mem *cmd);
 extern int be_cmd_set_qos(struct be_adapter *adapter, u32 bps, u32 domain);
+extern void be_dump_ue(struct be_adapter *adapter);
 

diff --git a/drivers/net/benet/be_hw.h b/drivers/net/benet/be_hw.h
index 0683967..6c8f9bb 100644 (file)
--- a/drivers/net/benet/be_hw.h
+++ b/drivers/net/benet/be_hw.h
@@ -56,6 +56,16 @@
 #define PCICFG_PM_CONTROL_OFFSET               0x44
 #define PCICFG_PM_CONTROL_MASK                 0x108   /* bits 3 & 8 */
 
+/********* Online Control Registers *******/
+#define PCICFG_ONLINE0                         0xB0
+#define PCICFG_ONLINE1                         0xB4
+
+/********* UE Status and Mask Registers ***/
+#define PCICFG_UE_STATUS_LOW                   0xA0
+#define PCICFG_UE_STATUS_HIGH                  0xA4
+#define PCICFG_UE_STATUS_LOW_MASK              0xA8
+#define PCICFG_UE_STATUS_HI_MASK               0xAC
+
 /********* ISR0 Register offset **********/
 #define CEV_ISR0_OFFSET                        0xC18
 #define CEV_ISR_SIZE                           4

diff --git a/drivers/net/benet/be_main.c b/drivers/net/benet/be_main.c
index e72b482..e4a8ae3 100644 (file)
--- a/drivers/net/benet/be_main.c
+++ b/drivers/net/benet/be_main.c
@@ -40,6 +40,76 @@ static DEFINE_PCI_DEVICE_TABLE(be_dev_ids) = {
        { 0 }
 };
 MODULE_DEVICE_TABLE(pci, be_dev_ids);
+/* UE Status Low CSR */
+static char *ue_status_low_desc[] = {
+       "CEV",
+       "CTX",
+       "DBUF",
+       "ERX",
+       "Host",
+       "MPU",
+       "NDMA",
+       "PTC ",
+       "RDMA ",
+       "RXF ",
+       "RXIPS ",
+       "RXULP0 ",
+       "RXULP1 ",
+       "RXULP2 ",
+       "TIM ",
+       "TPOST ",
+       "TPRE ",
+       "TXIPS ",
+       "TXULP0 ",
+       "TXULP1 ",
+       "UC ",
+       "WDMA ",
+       "TXULP2 ",
+       "HOST1 ",
+       "P0_OB_LINK ",
+       "P1_OB_LINK ",
+       "HOST_GPIO ",
+       "MBOX ",
+       "AXGMAC0",
+       "AXGMAC1",
+       "JTAG",
+       "MPU_INTPEND"
+};
+/* UE Status High CSR */
+static char *ue_status_hi_desc[] = {
+       "LPCMEMHOST",
+       "MGMT_MAC",
+       "PCS0ONLINE",
+       "MPU_IRAM",
+       "PCS1ONLINE",
+       "PCTL0",
+       "PCTL1",
+       "PMEM",
+       "RR",
+       "TXPB",
+       "RXPP",
+       "XAUI",
+       "TXP",
+       "ARM",
+       "IPC",
+       "HOST2",
+       "HOST3",
+       "HOST4",
+       "HOST5",
+       "HOST6",
+       "HOST7",
+       "HOST8",
+       "HOST9",
+       "NETC"
+       "Unknown",
+       "Unknown",
+       "Unknown",
+       "Unknown",
+       "Unknown",
+       "Unknown",
+       "Unknown",
+       "Unknown"
+};
 
 static void be_queue_free(struct be_adapter *adapter, struct be_queue_info *q)
 {
@@ -1673,6 +1743,59 @@ static int be_poll_tx_mcc(struct napi_struct *napi, int budget)
        return 1;
 }
 
+static inline bool be_detect_ue(struct be_adapter *adapter)
+{
+       u32 online0 = 0, online1 = 0;
+
+       pci_read_config_dword(adapter->pdev, PCICFG_ONLINE0, &online0);
+
+       pci_read_config_dword(adapter->pdev, PCICFG_ONLINE1, &online1);
+
+       if (!online0 || !online1) {
+               adapter->ue_detected = true;
+               dev_err(&adapter->pdev->dev,
+                       "UE Detected!! online0=%d online1=%d\n",
+                       online0, online1);
+               return true;
+       }
+
+       return false;
+}
+
+void be_dump_ue(struct be_adapter *adapter)
+{
+       u32 ue_status_lo, ue_status_hi, ue_status_lo_mask, ue_status_hi_mask;
+       u32 i;
+
+       pci_read_config_dword(adapter->pdev,
+                               PCICFG_UE_STATUS_LOW, &ue_status_lo);
+       pci_read_config_dword(adapter->pdev,
+                               PCICFG_UE_STATUS_HIGH, &ue_status_hi);
+       pci_read_config_dword(adapter->pdev,
+                               PCICFG_UE_STATUS_LOW_MASK, &ue_status_lo_mask);
+       pci_read_config_dword(adapter->pdev,
+                               PCICFG_UE_STATUS_HI_MASK, &ue_status_hi_mask);
+
+       ue_status_lo = (ue_status_lo & (~ue_status_lo_mask));
+       ue_status_hi = (ue_status_hi & (~ue_status_hi_mask));
+
+       if (ue_status_lo) {
+               for (i = 0; ue_status_lo; ue_status_lo >>= 1, i++) {
+                       if (ue_status_lo & 1)
+                               dev_err(&adapter->pdev->dev,
+                               "UE: %s bit set\n", ue_status_low_desc[i]);
+               }
+       }
+       if (ue_status_hi) {
+               for (i = 0; ue_status_hi; ue_status_hi >>= 1, i++) {
+                       if (ue_status_hi & 1)
+                               dev_err(&adapter->pdev->dev,
+                               "UE: %s bit set\n", ue_status_hi_desc[i]);
+               }
+       }
+
+}
+
 static void be_worker(struct work_struct *work)
 {
        struct be_adapter *adapter =
@@ -1690,6 +1813,10 @@ static void be_worker(struct work_struct *work)
                adapter->rx_post_starved = false;
                be_post_rx_frags(adapter);
        }
+       if (!adapter->ue_detected) {
+               if (be_detect_ue(adapter))
+                       be_dump_ue(adapter);
+       }
 
        schedule_delayed_work(&adapter->work, msecs_to_jiffies(1000));
 }