[IA64-SGI] Older PROM WAR for device flush code
Work-around to temporarily support older PROMs with new flush device code.
This code allows systems running older PROMs to continue to run on the new
kernel base until a new official PROM is released.
Signed-off-by: Prarit Bhargava <prarit@sgi.com>
Acked-by: Jes Sorensen <jes@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
diff --git a/arch/ia64/sn/include/xtalk/hubdev.h b/arch/ia64/sn/include/xtalk/hubdev.h
index 7c88e9a..8182583 100644
--- a/arch/ia64/sn/include/xtalk/hubdev.h
+++ b/arch/ia64/sn/include/xtalk/hubdev.h
@@ -51,6 +51,15 @@
struct sn_flush_device_common *common;
};
+/* 01/16/06 This struct is the old PROM/kernel struct and needs to be included
+ * for older official PROMs to function on the new kernel base. This struct
+ * will be removed when the next official PROM release occurs. */
+
+struct sn_flush_device_war {
+ struct sn_flush_device_common common;
+ u32 filler; /* older PROMs expect the default size of a spinlock_t */
+};
+
/*
* **widget_p - Used as an array[wid_num][device] of sn_flush_device_kernel.
*/
diff --git a/arch/ia64/sn/kernel/io_init.c b/arch/ia64/sn/kernel/io_init.c
index 233d551..00700f7 100644
--- a/arch/ia64/sn/kernel/io_init.c
+++ b/arch/ia64/sn/kernel/io_init.c
@@ -165,8 +165,45 @@
return NULL;
}
+/* Older PROM flush WAR
+ *
+ * 01/16/06 -- This war will be in place until a new official PROM is released.
+ * Additionally note that the struct sn_flush_device_war also has to be
+ * removed from arch/ia64/sn/include/xtalk/hubdev.h
+ */
+static u8 war_implemented = 0;
+
+static void sn_device_fixup_war(u64 nasid, u64 widget, int device,
+ struct sn_flush_device_common *common)
+{
+ struct sn_flush_device_war *war_list;
+ struct sn_flush_device_war *dev_entry;
+ struct ia64_sal_retval isrv = {0,0,0,0};
+
+ if (!war_implemented) {
+ printk(KERN_WARNING "PROM version < 4.50 -- implementing old "
+ "PROM flush WAR\n");
+ war_implemented = 1;
+ }
+
+ war_list = kzalloc(DEV_PER_WIDGET * sizeof(*war_list), GFP_KERNEL);
+ if (!war_list)
+ BUG();
+
+ SAL_CALL_NOLOCK(isrv, SN_SAL_IOIF_GET_WIDGET_DMAFLUSH_LIST,
+ nasid, widget, __pa(war_list), 0, 0, 0 ,0);
+ if (isrv.status)
+ panic("sn_device_fixup_war failed: %s\n",
+ ia64_sal_strerror(isrv.status));
+
+ dev_entry = war_list + device;
+ memcpy(common,dev_entry, sizeof(*common));
+
+ kfree(war_list);
+}
+
/*
- * sn_fixup_ionodes() - This routine initializes the HUB data strcuture for
+ * sn_fixup_ionodes() - This routine initializes the HUB data strcuture for
* each node in the system.
*/
static void sn_fixup_ionodes(void)
@@ -246,8 +283,19 @@
widget,
device,
(u64)(dev_entry->common));
- if (status)
- BUG();
+ if (status) {
+ if (sn_sal_rev() < 0x0450) {
+ /* shortlived WAR for older
+ * PROM images
+ */
+ sn_device_fixup_war(nasid,
+ widget,
+ device,
+ dev_entry->common);
+ }
+ else
+ BUG();
+ }
spin_lock_init(&dev_entry->sfdl_flush_lock);
}
