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Subject[PATCH 03/10] IOCHK interface for I/O error handling/detecting
[This is 3 of 10 patches, "iochk-03-register.patch"]

- Implement ia64 version of basic codes:
iochk_clear, iochk_read, iochk_init, and iocookie

The direction is:

- Have a "now in check" global list, "iochk_devices",
for future use.

- Take a lock, "iochk_lock", to protect the global list.

- iochk_clear packs *dev into iocookie, and add it to
the global list. After all prepared, clear error-flag
in cookie to start io-critical-session.

- iochk_read checks error-flag and device's status
register. After removing iocookie from list, return
the result.

This is too simple. We need more codes... See next (4 of 10).

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

---

arch/ia64/lib/iomap_check.c | 54 ++++++++++++++++++++++++++++++++++++++++++--
include/asm-ia64/io.h | 8 +++++-
2 files changed, 59 insertions(+), 3 deletions(-)

Index: linux-2.6.11.11/arch/ia64/lib/iomap_check.c
===================================================================
--- linux-2.6.11.11.orig/arch/ia64/lib/iomap_check.c
+++ linux-2.6.11.11/arch/ia64/lib/iomap_check.c
@@ -4,24 +4,74 @@
*/

#include <linux/pci.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>

void iochk_init(void);
void iochk_clear(iocookie *cookie, struct pci_dev *dev);
int iochk_read(iocookie *cookie);

+struct list_head iochk_devices;
+DEFINE_SPINLOCK(iochk_lock); /* all works are excluded on this lock */
+
+static int have_error(struct pci_dev *dev);
+
void iochk_init(void)
{
/* setup */
+ INIT_LIST_HEAD(&iochk_devices);
}

void iochk_clear(iocookie *cookie, struct pci_dev *dev)
{
- /* register device etc. */
+ unsigned long flag;
+
+ INIT_LIST_HEAD(&(cookie->list));
+
+ cookie->dev = dev;
+
+ spin_lock_irqsave(&iochk_lock, flag);
+ list_add(&cookie->list, &iochk_devices);
+ spin_unlock_irqrestore(&iochk_lock, flag);
+
+ cookie->error = 0;
}

int iochk_read(iocookie *cookie)
{
- /* check error etc. */
+ unsigned long flag;
+ int ret = 0;
+
+ spin_lock_irqsave(&iochk_lock, flag);
+ if( cookie->error || have_error(cookie->dev) )
+ ret = 1;
+ list_del(&cookie->list);
+ spin_unlock_irqrestore(&iochk_lock, flag);
+
+ return ret;
+}
+
+static int have_error(struct pci_dev *dev)
+{
+ u16 status;
+
+ /* check status */
+ switch (dev->hdr_type) {
+ case PCI_HEADER_TYPE_NORMAL: /* 0 */
+ pci_read_config_word(dev, PCI_STATUS, &status);
+ break;
+ case PCI_HEADER_TYPE_BRIDGE: /* 1 */
+ pci_read_config_word(dev, PCI_SEC_STATUS, &status);
+ break;
+ case PCI_HEADER_TYPE_CARDBUS: /* 2 */
+ default:
+ BUG();
+ }
+
+ if ( (status & PCI_STATUS_REC_TARGET_ABORT)
+ || (status & PCI_STATUS_REC_MASTER_ABORT)
+ || (status & PCI_STATUS_DETECTED_PARITY) )
+ return 1;

return 0;
}
Index: linux-2.6.11.11/include/asm-ia64/io.h
===================================================================
--- linux-2.6.11.11.orig/include/asm-ia64/io.h
+++ linux-2.6.11.11/include/asm-ia64/io.h
@@ -72,9 +72,15 @@ extern unsigned int num_io_spaces;
#include <asm/system.h>

#ifdef CONFIG_IOMAP_CHECK
+#include <linux/list.h>

/* definition of ia64 iocookie */
-typedef unsigned long iocookie;
+struct __iocookie {
+ struct list_head list;
+ struct pci_dev *dev; /* targeting device */
+ unsigned long error; /* error flag */
+};
+typedef struct __iocookie iocookie;

/* enable ia64 iochk - See arch/ia64/lib/iomap_check.c */
#define HAVE_ARCH_IOMAP_CHECK
-
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