linux-kernel - jsm: Adding EEH handlers

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Date:	Fri, 11 Sep 2009 12:35:58 -0300
From:	Breno Leitao <leitao@...ux.vnet.ibm.com>
To:	Wen Xiong <wenxiong@...ibm.com>, scottk@...i.com
CC:	alan@...rguk.ukuu.org.uk,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: jsm: Adding EEH handlers

Adding EEH handlers for the serial jsm driver. This patch adds
the PCI error handlers and also register them to be called when 
a error is detected.

Signed-off-by: Breno Leitao <leitao@...ux.vnet.ibm.com>
---
diff --git a/drivers/serial/jsm/jsm_driver.c b/drivers/serial/jsm/jsm_driver.c
index b3604aa..b37d2e2 100644
--- a/drivers/serial/jsm/jsm_driver.c
+++ b/drivers/serial/jsm/jsm_driver.c
@@ -48,6 +48,20 @@ struct uart_driver jsm_uart_driver = {
 	.nr		= NR_PORTS,
 };
 
+static pci_ers_result_t jsm_io_error_detected(struct pci_dev *pdev,
+					pci_channel_state_t state);
+static pci_ers_result_t jsm_io_slot_reset(struct pci_dev *pdev);
+static void jsm_io_resume(struct pci_dev *pdev);
+
+static struct pci_error_handlers jsm_err_handler = {
+	.error_detected = jsm_io_error_detected,
+	.slot_reset = jsm_io_slot_reset,
+	.resume = jsm_io_resume,
+};
+
 int jsm_debug;
 module_param(jsm_debug, int, 0);
 MODULE_PARM_DESC(jsm_debug, "Driver debugging level");
@@ -164,6 +178,7 @@ static int __devinit jsm_probe_one(struct pci_dev *pdev, const struct pci_device
 	}
 
 	pci_set_drvdata(pdev, brd);
+	pci_save_state(pdev);
 
 	return 0;
  out_free_irq:
@@ -222,8 +237,39 @@ static struct pci_driver jsm_driver = {
 	.id_table	= jsm_pci_tbl,
 	.probe		= jsm_probe_one,
 	.remove		= __devexit_p(jsm_remove_one),
+	.err_handler	= &jsm_err_handler,
 };
 
+static pci_ers_result_t jsm_io_error_detected(struct pci_dev *pdev,
+					pci_channel_state_t state)
+{
+	struct jsm_board *brd = pci_get_drvdata(pdev);
+
+	jsm_remove_uart_port(brd);
+
+	return PCI_ERS_RESULT_NEED_RESET;
+}
+
+static pci_ers_result_t jsm_io_slot_reset(struct pci_dev *pdev)
+{
+	pci_enable_device(pdev);
+	pci_set_master(pdev);
+
+	return PCI_ERS_RESULT_RECOVERED;
+}
+
+static void jsm_io_resume(struct pci_dev *pdev)
+{
+	struct jsm_board *brd = pci_get_drvdata(pdev);
+
+	pci_restore_state(pdev);
+
+	jsm_uart_port_init(brd);
+}
+
 static int __init jsm_init_module(void)
 {
 	int rc;
diff --git a/drivers/serial/jsm/jsm_tty.c b/drivers/serial/jsm/jsm_tty.c
index 00f4577..e70f2c1 100644
--- a/drivers/serial/jsm/jsm_tty.c
+++ b/drivers/serial/jsm/jsm_tty.c
@@ -432,7 +432,7 @@ int __devinit jsm_tty_init(struct jsm_board *brd)
 	return 0;
 }
 
-int __devinit jsm_uart_port_init(struct jsm_board *brd)
+int jsm_uart_port_init(struct jsm_board *brd)
 {
 	int i;
 	unsigned int line;
--
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