[PATCH 4/6] PCIERR : interfaces for synchronous I/O error detection

Hidetoshi Seto
2006-03-24T07:50:12Z

This patch is 3/4 of PCIERR implementation for IA64.

This part describes modifies in mca_drv.
If MCA happens and the error address was in resource of registered
RAS-aware driver, mca_drv notify the error to the driver and
restart the system. Soon notified driver will do its recovery.

Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>

-----
arch/ia64/kernel/mca_drv.c | 81 +++++++++++++++++++++++++++++++++++++++++++
arch/ia64/lib/pcierr_check.c | 1
2 files changed, 82 insertions(+)

Index: linux-2.6.16_WORK/arch/ia64/kernel/mca_drv.c
=================================--- linux-2.6.16_WORK.orig/arch/ia64/kernel/mca_drv.c
+++ linux-2.6.16_WORK/arch/ia64/kernel/mca_drv.c
@@ -37,6 +37,11 @@

#include "mca_drv.h"

+#ifdef CONFIG_PCIERR_CHECK
+#include <linux/pci.h>
+extern struct list_head pcierr_list;
+#endif
+
/* max size of SAL error record (default) */
static int sal_rec_max = 10000;

@@ -399,6 +404,76 @@
return MCA_IS_GLOBAL;
}

+#ifdef CONFIG_PCIERR_CHECK
+
+/**
+ * get_target_identifier - get address of target_identifier
+ * @peidx: pointer of index of processor error section
+ *
+ * Return value:
+ * addr if valid / 0 if not valid
+ */
+static u64 get_target_identifier(peidx_table_t *peidx)
+{
+ sal_log_mod_error_info_t *smei;
+
+ smei = peidx_bus_check(peidx, 0);
+ if (smei->valid.target_identifier)
+ return (smei->target_identifier);
+ return 0;
+}
+
+#define isMEM64(resource) \
+(((resource).flags & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) \
+ = (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64))
+
+/**
+ * pcierr_recovery - Check if MCA occur on transaction in pcierr_list.
+ * @peidx: pointer of index of processor error section
+ *
+ * Return value:
+ * 1 if error could be caught in driver / 0 if not
+ */
+static int pcierr_recovery(peidx_table_t *peidx)
+{
+ u64 addr;
+ int i, loop = 0;
+ struct pci_dev *tdev;
+ iocookie *cookie;
+
+ if (list_empty(&pcierr_list))
+ return 0;
+
+ addr = get_target_identifier(peidx);
+ if (!addr)
+ return 0;
+
+ list_for_each_entry(cookie, &pcierr_list, list) {
+ /* MCA is non-maskable, be careful */
+ if (loop++ > 1024 || !cookie)
+ break;
+ /* double check */
+ if (pcierr_list.next = cookie->list.next)
+ break;
+ tdev = cookie->dev;
+ if (!tdev)
+ continue;
+ for (i = 0; i < PCI_ROM_RESOURCE; i++) {
+ if (tdev->resource[i].start <= addr
+ && addr <= tdev->resource[i].end) {
+ cookie->error = 1;
+ return 1;
+ }
+ if (isMEM64(tdev->resource[i]))
+ i++;
+ }
+ }
+
+ return 0;
+}
+
+#endif /* CONFIG_PCIERR_CHECK */
+
/**
* recover_from_read_error - Try to recover the errors which type are "read"s.
* @slidx: pointer of index of SAL error record
@@ -473,6 +548,12 @@

}

+#ifdef CONFIG_PCIERR_CHECK
+ /* Are there any RAS-aware drivers? */
+ if (pcierr_recovery(peidx))
+ return 1;
+#endif
+
return 0;
}

Index: linux-2.6.16_WORK/arch/ia64/lib/pcierr_check.c
=================================--- linux-2.6.16_WORK.orig/arch/ia64/lib/pcierr_check.c
+++ linux-2.6.16_WORK/arch/ia64/lib/pcierr_check.c
@@ -68,5 +68,6 @@
return 0;
}

+EXPORT_SYMBOL(pcierr_list); /* for MCA driver */
EXPORT_SYMBOL(pcierr_read);
EXPORT_SYMBOL(pcierr_clear);