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Commit 5f7f5b0c authored by Prarit Bhargava's avatar Prarit Bhargava Committed by Tony Luck
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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: default avatarPrarit Bhargava <prarit@sgi.com>
Acked-by: default avatarJes Sorensen <jes@sgi.com>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent 2664b250

arch/ia64/sn/include/xtalk/hubdev.h

+9 −0
Original line number Diff line number Diff line
@@ -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.

 */

arch/ia64/sn/kernel/io_init.c

+51 −3
Original line number Diff line number Diff line
@@ -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)

				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);

			}