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[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>
This commit is contained in:
Prarit Bhargava 2006-01-16 15:31:52 -05:00 committed by Tony Luck
parent 2664b25051
commit 5f7f5b0c99
2 changed files with 60 additions and 3 deletions
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9
arch/ia64/sn/include/xtalk/hubdev.h
View File

@ -51,6 +51,15 @@ struct sn_flush_device_kernel {
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.
*/

52
arch/ia64/sn/kernel/io_init.c
View File

@ -165,6 +165,43 @@ sn_pcidev_info_get(struct pci_dev *dev)
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
* each node in the system.
@ -246,8 +283,19 @@ static void sn_fixup_ionodes(void)
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);
}