From: Jack Steiner <steiner@sgi.com>
To: linux-ia64@vger.kernel.org
Subject: [PATCH 6/7] - New SN hardware support - cpu_relax
Date: Thu, 11 Aug 2005 17:27:36 +0000 [thread overview]
Message-ID: <20050811172736.GA18809@sgi.com> (raw)
Add a few missing calls to "hint @pause".
Signed-off-by: Jack Steiner <steiner@sgi.com>
arch/ia64/sn/kernel/bte.c | 1 +
arch/ia64/sn/kernel/huberror.c | 2 +-
arch/ia64/sn/pci/pcibr/pcibr_dma.c | 3 ++-
include/asm-ia64/sn/sn_sal.h | 3 ++-
4 files changed, 6 insertions(+), 3 deletions(-)
Index: linux/arch/ia64/sn/kernel/bte.c
=================================--- linux.orig/arch/ia64/sn/kernel/bte.c 2005-08-10 15:25:01.132347903 -0500
+++ linux/arch/ia64/sn/kernel/bte.c 2005-08-10 15:25:06.130870140 -0500
@@ -215,6 +215,7 @@ retry_bteop:
}
while ((transfer_stat = *bte->most_rcnt_na) = BTE_WORD_BUSY) {
+ cpu_relax();
if (ia64_get_itc() > itc_end) {
BTE_PRINTK(("BTE timeout nasid 0x%x bte%d IBLS = 0x%lx na 0x%lx\n",
NASID_GET(bte->bte_base_addr), bte->bte_num,
Index: linux/arch/ia64/sn/kernel/huberror.c
=================================--- linux.orig/arch/ia64/sn/kernel/huberror.c 2005-08-10 15:25:01.132347903 -0500
+++ linux/arch/ia64/sn/kernel/huberror.c 2005-08-10 15:25:06.131846604 -0500
@@ -76,7 +76,7 @@ void hubiio_crb_free(struct hubdev_info
*/
REMOTE_HUB_S(hubdev_info->hdi_nasid, IIO_ICDR, (IIO_ICDR_PND | crbnum));
while (REMOTE_HUB_L(hubdev_info->hdi_nasid, IIO_ICDR) & IIO_ICDR_PND)
- udelay(1);
+ cpu_relax();
}
Index: linux/arch/ia64/sn/pci/pcibr/pcibr_dma.c
=================================--- linux.orig/arch/ia64/sn/pci/pcibr/pcibr_dma.c 2005-08-10 15:25:01.133324368 -0500
+++ linux/arch/ia64/sn/pci/pcibr/pcibr_dma.c 2005-08-10 15:25:06.136728927 -0500
@@ -306,7 +306,8 @@ void sn_dma_flush(uint64_t addr)
*(volatile uint32_t *)(p->sfdl_force_int_addr) = 1;
/* wait for the interrupt to come back. */
- while (*(p->sfdl_flush_addr) != 0x10f) ;
+ while (*(p->sfdl_flush_addr) != 0x10f)
+ cpu_relax();
/* okay, everything is synched up. */
spin_unlock_irqrestore((spinlock_t *)&p->sfdl_flush_lock, flags);
Index: linux/include/asm-ia64/sn/sn_sal.h
=================================--- linux.orig/include/asm-ia64/sn/sn_sal.h 2005-08-10 15:25:01.133324368 -0500
+++ linux/include/asm-ia64/sn/sn_sal.h 2005-08-10 15:25:06.147470038 -0500
@@ -749,7 +749,8 @@ ia64_sn_power_down(void)
{
struct ia64_sal_retval ret_stuff;
SAL_CALL(ret_stuff, SN_SAL_SYSTEM_POWER_DOWN, 0, 0, 0, 0, 0, 0, 0);
- while(1);
+ while(1)
+ cpu_relax();
/* never returns */
}
--
Thanks
Jack Steiner (steiner@sgi.com) 651-683-5302
Principal Engineer SGI - Silicon Graphics, Inc.
reply other threads:[~2005-08-11 17:27 UTC|newest]
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