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edac: add e752x parameter for sysbus_parity selection 

Add a module parameter "sysbus_parity" to allow forcing system bus parity
error checking on or off.  Also add support to automatically disable system
bus parity errors for processors which do not support it.

If the sysbus_parity parameter is specified, sysbus parity detection will be
forced on or off.  If it is not specified, the driver will attempt to look at
the CPU identifier string and determine if the CPU supports system bus parity.
 A blacklist was used instead of a whitelist so that system bus parity would
be enabled by default and to minimize the chances of breaking things for those
people already using the driver which for some reason have a processor that
does not have a valid CPU identifier string.

[akpm@linux-foundation.org: coding-style fixes]
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
Signed-off-by: Doug Thompson <dougthompson@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Peter Tyser 2008-04-29 01:03:15 -07:00 committed by Linus Torvalds
parent 5135b797c8
commit 94ee1cf5a8
1 changed files with 39 additions and 1 deletions
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40
drivers/edac/e752x_edac.c
View File

@ -29,6 +29,7 @@
#define EDAC_MOD_STR "e752x_edac"
static int force_function_unhide;
static int sysbus_parity = -1;
static struct edac_pci_ctl_info *e752x_pci;
@ -1049,6 +1050,37 @@ fail:
return 1;
}
/* Setup system bus parity mask register.
* Sysbus parity supported on:
* e7320/e7520/e7525 + Xeon
* i3100 + Xeon/Celeron
* Sysbus parity not supported on:
* i3100 + Pentium M/Celeron M/Core Duo/Core2 Duo
*/
static void e752x_init_sysbus_parity_mask(struct e752x_pvt *pvt)
{
char *cpu_id = cpu_data(0).x86_model_id;
struct pci_dev *dev = pvt->dev_d0f1;
int enable = 1;
/* Allow module paramter override, else see if CPU supports parity */
if (sysbus_parity != -1) {
enable = sysbus_parity;
} else if (cpu_id[0] &&
((strstr(cpu_id, "Pentium") && strstr(cpu_id, " M ")) ||
(strstr(cpu_id, "Celeron") && strstr(cpu_id, " M ")) ||
(strstr(cpu_id, "Core") && strstr(cpu_id, "Duo")))) {
e752x_printk(KERN_INFO, "System Bus Parity not "
"supported by CPU, disabling\n");
enable = 0;
}
if (enable)
pci_write_config_word(dev, E752X_SYSBUS_ERRMASK, 0x0000);
else
pci_write_config_word(dev, E752X_SYSBUS_ERRMASK, 0x0309);
}
static void e752x_init_error_reporting_regs(struct e752x_pvt *pvt)
{
struct pci_dev *dev;
@ -1062,7 +1094,9 @@ static void e752x_init_error_reporting_regs(struct e752x_pvt *pvt)
pci_write_config_byte(dev, E752X_HI_ERRMASK, 0x00);
pci_write_config_byte(dev, E752X_HI_SMICMD, 0x00);
}
pci_write_config_word(dev, E752X_SYSBUS_ERRMASK, 0x00);
e752x_init_sysbus_parity_mask(pvt);
pci_write_config_word(dev, E752X_SYSBUS_SMICMD, 0x00);
pci_write_config_byte(dev, E752X_BUF_ERRMASK, 0x00);
pci_write_config_byte(dev, E752X_BUF_SMICMD, 0x00);
@ -1291,3 +1325,7 @@ MODULE_PARM_DESC(force_function_unhide, "if BIOS sets Dev0:Fun1 up as hidden:"
" 1=force unhide and hope BIOS doesn't fight driver for Dev0:Fun1 access");
module_param(edac_op_state, int, 0444);
MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");
module_param(sysbus_parity, int, 0444);
MODULE_PARM_DESC(sysbus_parity, "0=disable system bus parity checking,"
" 1=enable system bus parity checking, default=auto-detect");