wil6210: support for platform specific crash recovery

Added a simple interface for platform to perform crash
recovery.
When firmware crashes, wil driver can notify the platform
which can trigger a crash recovery process. During
the process the platform can request a ram dump
from the wil driver as well as control when firmware
recovery will start. This interface allows the platform
to implement a more advanced crash recovery, for
example to reset dependent subsystems in proper order, or
to provide its own notifications during the recovery process.

Signed-off-by: Lior David <qca_liord@qca.qualcomm.com>
Signed-off-by: Maya Erez <qca_merez@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

diff --git a/drivers/net/wireless/ath/wil6210/interrupt.c b/drivers/net/wireless/ath/wil6210/interrupt.c
index 50c136e..4f2ffa5 100644 (file)
--- a/drivers/net/wireless/ath/wil6210/interrupt.c
+++ b/drivers/net/wireless/ath/wil6210/interrupt.c
@@ -394,9 +394,13 @@ static irqreturn_t wil6210_irq_misc_thread(int irq, void *cookie)
                wil_fw_core_dump(wil);
                wil_notify_fw_error(wil);
                isr &= ~ISR_MISC_FW_ERROR;
-               wil_fw_error_recovery(wil);
+               if (wil->platform_ops.notify_crash) {
+                       wil_err(wil, "notify platform driver about FW crash");
+                       wil->platform_ops.notify_crash(wil->platform_handle);
+               } else {
+                       wil_fw_error_recovery(wil);
+               }
        }
-
        if (isr & ISR_MISC_MBOX_EVT) {
                wil_dbg_irq(wil, "MBOX event\n");
                wmi_recv_cmd(wil);

diff --git a/drivers/net/wireless/ath/wil6210/pcie_bus.c b/drivers/net/wireless/ath/wil6210/pcie_bus.c
index 1a3142c..e36f2a0 100644 (file)
--- a/drivers/net/wireless/ath/wil6210/pcie_bus.c
+++ b/drivers/net/wireless/ath/wil6210/pcie_bus.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012-2014 Qualcomm Atheros, Inc.
+ * Copyright (c) 2012-2015 Qualcomm Atheros, Inc.
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -125,11 +125,37 @@ static int wil_if_pcie_disable(struct wil6210_priv *wil)
        return 0;
 }
 
+static int wil_platform_rop_ramdump(void *wil_handle, void *buf, uint32_t size)
+{
+       struct wil6210_priv *wil = wil_handle;
+
+       if (!wil)
+               return -EINVAL;
+
+       return wil_fw_copy_crash_dump(wil, buf, size);
+}
+
+static int wil_platform_rop_fw_recovery(void *wil_handle)
+{
+       struct wil6210_priv *wil = wil_handle;
+
+       if (!wil)
+               return -EINVAL;
+
+       wil_fw_error_recovery(wil);
+
+       return 0;
+}
+
 static int wil_pcie_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
        struct wil6210_priv *wil;
        struct device *dev = &pdev->dev;
        int rc;
+       const struct wil_platform_rops rops = {
+               .ramdump = wil_platform_rop_ramdump,
+               .fw_recovery = wil_platform_rop_fw_recovery,
+       };
 
        /* check HW */
        dev_info(&pdev->dev, WIL_NAME
@@ -154,7 +180,7 @@ static int wil_pcie_probe(struct pci_dev *pdev, const struct pci_device_id *id)
        /* rollback to if_free */
 
        wil->platform_handle =
-                       wil_platform_init(&pdev->dev, &wil->platform_ops);
+               wil_platform_init(&pdev->dev, &wil->platform_ops, &rops, wil);
        if (!wil->platform_handle) {
                rc = -ENODEV;
                wil_err(wil, "wil_platform_init failed\n");

diff --git a/drivers/net/wireless/ath/wil6210/wil6210.h b/drivers/net/wireless/ath/wil6210/wil6210.h
index ade5f3b..235e205 100644 (file)
--- a/drivers/net/wireless/ath/wil6210/wil6210.h
+++ b/drivers/net/wireless/ath/wil6210/wil6210.h
@@ -828,6 +828,7 @@ int wil_can_suspend(struct wil6210_priv *wil, bool is_runtime);
 int wil_suspend(struct wil6210_priv *wil, bool is_runtime);
 int wil_resume(struct wil6210_priv *wil, bool is_runtime);
 
+int wil_fw_copy_crash_dump(struct wil6210_priv *wil, void *dest, u32 size);
 void wil_fw_core_dump(struct wil6210_priv *wil);
 
 #endif /* __WIL6210_H__ */

diff --git a/drivers/net/wireless/ath/wil6210/wil_crash_dump.c b/drivers/net/wireless/ath/wil6210/wil_crash_dump.c
index 7e70934..b57d280 100644 (file)
--- a/drivers/net/wireless/ath/wil6210/wil_crash_dump.c
+++ b/drivers/net/wireless/ath/wil6210/wil_crash_dump.c
@@ -51,8 +51,7 @@ static int wil_fw_get_crash_dump_bounds(struct wil6210_priv *wil,
        return 0;
 }
 
-static int wil_fw_copy_crash_dump(struct wil6210_priv *wil, void *dest,
-                                 u32 size)
+int wil_fw_copy_crash_dump(struct wil6210_priv *wil, void *dest, u32 size)
 {
        int i;
        const struct fw_map *map;

diff --git a/drivers/net/wireless/ath/wil6210/wil_platform.c b/drivers/net/wireless/ath/wil6210/wil_platform.c
index 2e831bf..4eed05b 100644 (file)
--- a/drivers/net/wireless/ath/wil6210/wil_platform.c
+++ b/drivers/net/wireless/ath/wil6210/wil_platform.c
@@ -33,7 +33,8 @@ void wil_platform_modexit(void)
  * It returns a handle which is used with the rest of the API
  *
  */
-void *wil_platform_init(struct device *dev, struct wil_platform_ops *ops)
+void *wil_platform_init(struct device *dev, struct wil_platform_ops *ops,
+                       const struct wil_platform_rops *rops, void *wil_handle)
 {
        void *handle = ops; /* to return some non-NULL for 'void' impl. */
 

diff --git a/drivers/net/wireless/ath/wil6210/wil_platform.h b/drivers/net/wireless/ath/wil6210/wil_platform.h
index d7fa19b..9a949d9 100644 (file)
--- a/drivers/net/wireless/ath/wil6210/wil_platform.h
+++ b/drivers/net/wireless/ath/wil6210/wil_platform.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014 Qualcomm Atheros, Inc.
+ * Copyright (c) 2014-2015 Qualcomm Atheros, Inc.
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -20,16 +20,48 @@
 struct device;
 
 /**
- * struct wil_platform_ops - wil platform module callbacks
+ * struct wil_platform_ops - wil platform module calls from this
+ * driver to platform driver
  */
 struct wil_platform_ops {
        int (*bus_request)(void *handle, uint32_t kbps /* KBytes/Sec */);
        int (*suspend)(void *handle);
        int (*resume)(void *handle);
        void (*uninit)(void *handle);
+       int (*notify_crash)(void *handle);
 };
 
-void *wil_platform_init(struct device *dev, struct wil_platform_ops *ops);
+/**
+ * struct wil_platform_rops - wil platform module callbacks from
+ * platform driver to this driver
+ * @ramdump: store a ramdump from the wil firmware. The platform
+ *     driver may add additional data to the ramdump to
+ *     generate the final crash dump.
+ * @fw_recovery: start a firmware recovery process. Called as
+ *      part of a crash recovery process which may include other
+ *      related platform subsystems.
+ */
+struct wil_platform_rops {
+       int (*ramdump)(void *wil_handle, void *buf, uint32_t size);
+       int (*fw_recovery)(void *wil_handle);
+};
+
+/**
+ * wil_platform_init - initialize the platform driver
+ *
+ * @dev - pointer to the wil6210 device
+ * @ops - structure with platform driver operations. Platform
+ *     driver will fill this structure with function pointers.
+ * @rops - structure with callbacks from platform driver to
+ *     this driver. The platform driver copies the structure to
+ *     its own storage. Can be NULL if this driver does not
+ *     support crash recovery.
+ * @wil_handle - context for this driver that will be passed
+ *      when platform driver invokes one of the callbacks in
+ *      rops. May be NULL if rops is NULL.
+ */
+void *wil_platform_init(struct device *dev, struct wil_platform_ops *ops,
+                       const struct wil_platform_rops *rops, void *wil_handle);
 
 int __init wil_platform_modinit(void);
 void wil_platform_modexit(void);