brcmfmac: add support for sysfs initiated coredump

The driver already supports device coredump initiated by firmware
event. Since commit 3c47d19ff4dc ("drivers: base: add coredump driver
ops") it is also possible to initiate it from user-space through
sysfs. This patch adds support for SDIO and PCIe devices.

Reviewed-by: Hante Meuleman <hante.meuleman@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com>
Reviewed-by: Franky Lin <franky.lin@broadcom.com>
Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c

@@ -1165,6 +1165,7 @@ static struct sdio_driver brcmf_sdmmc_driver = {
 #ifdef CONFIG_PM_SLEEP
 		.pm = &brcmf_sdio_pm_ops,
 #endif	/* CONFIG_PM_SLEEP */
+		.coredump = brcmf_dev_coredump,
 	},
 };
 

drivers/net/wireless/broadcom/brcm80211/brcmfmac/bus.h

@@ -250,6 +250,8 @@ int brcmf_attach(struct device *dev, struct brcmf_mp_device *settings);
 void brcmf_detach(struct device *dev);
 /* Indication from bus module that dongle should be reset */
 void brcmf_dev_reset(struct device *dev);
+/* Request from bus module to initiate a coredump */
+void brcmf_dev_coredump(struct device *dev);
 
 /* Configure the "global" bus state used by upper layers */
 void brcmf_bus_change_state(struct brcmf_bus *bus, enum brcmf_bus_state state);

drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c

@@ -1180,6 +1180,14 @@ void brcmf_dev_reset(struct device *dev)
 		brcmf_fil_cmd_int_set(drvr->iflist[0], BRCMF_C_TERMINATED, 1);
 }
 
+void brcmf_dev_coredump(struct device *dev)
+{
+	struct brcmf_bus *bus_if = dev_get_drvdata(dev);
+
+	if (brcmf_debug_create_memdump(bus_if, NULL, 0) < 0)
+		brcmf_dbg(TRACE, "failed to create coredump\n");
+}
+
 void brcmf_detach(struct device *dev)
 {
 	s32 i;

drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c

@@ -2044,6 +2044,7 @@ static struct pci_driver brcmf_pciedrvr = {
 #ifdef CONFIG_PM
 	.driver.pm = &brcmf_pciedrvr_pm,
 #endif
+	.driver.coredump = brcmf_dev_coredump,
 };