8250_pci Add EEH support to the 8250 driver for IBM/Digi PCIe 2-port Adapter

The purpose of the patch is to add EEH support to the 8250_PCI driver
for the IBM/Digi PCIE 2port Async EIA-232 Adapter that uses a PLX
chipset on the PPC platforrm.  Basic support for this adapter was
recently added https://lkml.org/lkml/2011/5/11/341

This patch was created against the linux-next kernel

Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Breno Leitao <leitao@linux.vnet.ibm.com>
Cc: Scott Kilau <scottk@digi.com>
Signed-off-by: Michael Reed <mreed@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/tty/serial/8250_pci.c b/drivers/tty/serial/8250_pci.c
index e1d4668..ae2188c 100644 (file)
--- a/drivers/tty/serial/8250_pci.c
+++ b/drivers/tty/serial/8250_pci.c
@@ -2708,6 +2708,7 @@ pciserial_init_one(struct pci_dev *dev, const struct pci_device_id *ent)
        board = &pci_boards[ent->driver_data];
 
        rc = pci_enable_device(dev);
+       pci_save_state(dev);
        if (rc)
                return rc;
 
@@ -4002,6 +4003,51 @@ static struct pci_device_id serial_pci_tbl[] = {
        { 0, }
 };
 
+static pci_ers_result_t serial8250_io_error_detected(struct pci_dev *dev,
+                                               pci_channel_state_t state)
+{
+       struct serial_private *priv = pci_get_drvdata(dev);
+
+       if (state == pci_channel_io_perm_failure)
+               return PCI_ERS_RESULT_DISCONNECT;
+
+       if (priv)
+               pciserial_suspend_ports(priv);
+
+       pci_disable_device(dev);
+
+       return PCI_ERS_RESULT_NEED_RESET;
+}
+
+static pci_ers_result_t serial8250_io_slot_reset(struct pci_dev *dev)
+{
+       int rc;
+
+       rc = pci_enable_device(dev);
+
+       if (rc)
+               return PCI_ERS_RESULT_DISCONNECT;
+
+       pci_restore_state(dev);
+       pci_save_state(dev);
+
+       return PCI_ERS_RESULT_RECOVERED;
+}
+
+static void serial8250_io_resume(struct pci_dev *dev)
+{
+       struct serial_private *priv = pci_get_drvdata(dev);
+
+       if (priv)
+               pciserial_resume_ports(priv);
+}
+
+static struct pci_error_handlers serial8250_err_handler = {
+       .error_detected = serial8250_io_error_detected,
+       .slot_reset = serial8250_io_slot_reset,
+       .resume = serial8250_io_resume,
+};
+
 static struct pci_driver serial_pci_driver = {
        .name           = "serial",
        .probe          = pciserial_init_one,
@@ -4011,6 +4057,7 @@ static struct pci_driver serial_pci_driver = {
        .resume         = pciserial_resume_one,
 #endif
        .id_table       = serial_pci_tbl,
+       .err_handler    = &serial8250_err_handler,
 };
 
 static int __init serial8250_pci_init(void)