mirror of https://gitee.com/openkylin/linux.git
139 lines
3.7 KiB
C
139 lines
3.7 KiB
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
|
|
*/
|
|
|
|
/*
|
|
* Cross Partition (XP) sn2-based functions.
|
|
*
|
|
* Architecture specific implementation of common functions.
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <asm/sn/bte.h>
|
|
#include <asm/sn/sn_sal.h>
|
|
#include "xp.h"
|
|
|
|
/*
|
|
* The export of xp_nofault_PIOR needs to happen here since it is defined
|
|
* in drivers/misc/sgi-xp/xp_nofault.S. The target of the nofault read is
|
|
* defined here.
|
|
*/
|
|
EXPORT_SYMBOL_GPL(xp_nofault_PIOR);
|
|
|
|
u64 xp_nofault_PIOR_target;
|
|
EXPORT_SYMBOL_GPL(xp_nofault_PIOR_target);
|
|
|
|
/*
|
|
* Register a nofault code region which performs a cross-partition PIO read.
|
|
* If the PIO read times out, the MCA handler will consume the error and
|
|
* return to a kernel-provided instruction to indicate an error. This PIO read
|
|
* exists because it is guaranteed to timeout if the destination is down
|
|
* (amo operations do not timeout on at least some CPUs on Shubs <= v1.2,
|
|
* which unfortunately we have to work around).
|
|
*/
|
|
static enum xp_retval
|
|
xp_register_nofault_code_sn2(void)
|
|
{
|
|
int ret;
|
|
u64 func_addr;
|
|
u64 err_func_addr;
|
|
|
|
func_addr = *(u64 *)xp_nofault_PIOR;
|
|
err_func_addr = *(u64 *)xp_error_PIOR;
|
|
ret = sn_register_nofault_code(func_addr, err_func_addr, err_func_addr,
|
|
1, 1);
|
|
if (ret != 0) {
|
|
dev_err(xp, "can't register nofault code, error=%d\n", ret);
|
|
return xpSalError;
|
|
}
|
|
/*
|
|
* Setup the nofault PIO read target. (There is no special reason why
|
|
* SH_IPI_ACCESS was selected.)
|
|
*/
|
|
if (is_shub1())
|
|
xp_nofault_PIOR_target = SH1_IPI_ACCESS;
|
|
else if (is_shub2())
|
|
xp_nofault_PIOR_target = SH2_IPI_ACCESS0;
|
|
|
|
return xpSuccess;
|
|
}
|
|
|
|
void
|
|
xp_unregister_nofault_code_sn2(void)
|
|
{
|
|
u64 func_addr = *(u64 *)xp_nofault_PIOR;
|
|
u64 err_func_addr = *(u64 *)xp_error_PIOR;
|
|
|
|
/* unregister the PIO read nofault code region */
|
|
(void)sn_register_nofault_code(func_addr, err_func_addr,
|
|
err_func_addr, 1, 0);
|
|
}
|
|
|
|
/*
|
|
* Wrapper for bte_copy().
|
|
*
|
|
* vdst - virtual address of the destination of the transfer.
|
|
* psrc - physical address of the source of the transfer.
|
|
* len - number of bytes to transfer from source to destination.
|
|
*
|
|
* Note: xp_remote_memcpy_sn2() should never be called while holding a spinlock.
|
|
*/
|
|
static enum xp_retval
|
|
xp_remote_memcpy_sn2(void *vdst, const void *psrc, size_t len)
|
|
{
|
|
bte_result_t ret;
|
|
u64 pdst = ia64_tpa(vdst);
|
|
/* ??? What are the rules governing the src and dst addresses passed in?
|
|
* ??? Currently we're assuming that dst is a virtual address and src
|
|
* ??? is a physical address, is this appropriate? Can we allow them to
|
|
* ??? be whatever and we make the change here without damaging the
|
|
* ??? addresses?
|
|
*/
|
|
|
|
/*
|
|
* Ensure that the physically mapped memory is contiguous.
|
|
*
|
|
* We do this by ensuring that the memory is from region 7 only.
|
|
* If the need should arise to use memory from one of the other
|
|
* regions, then modify the BUG_ON() statement to ensure that the
|
|
* memory from that region is always physically contiguous.
|
|
*/
|
|
BUG_ON(REGION_NUMBER(vdst) != RGN_KERNEL);
|
|
|
|
ret = bte_copy((u64)psrc, pdst, len, (BTE_NOTIFY | BTE_WACQUIRE), NULL);
|
|
if (ret == BTE_SUCCESS)
|
|
return xpSuccess;
|
|
|
|
if (is_shub2())
|
|
dev_err(xp, "bte_copy() on shub2 failed, error=0x%x\n", ret);
|
|
else
|
|
dev_err(xp, "bte_copy() failed, error=%d\n", ret);
|
|
|
|
return xpBteCopyError;
|
|
}
|
|
|
|
enum xp_retval
|
|
xp_init_sn2(void)
|
|
{
|
|
BUG_ON(!is_shub());
|
|
|
|
xp_max_npartitions = XP_MAX_NPARTITIONS_SN2;
|
|
|
|
xp_remote_memcpy = xp_remote_memcpy_sn2;
|
|
|
|
return xp_register_nofault_code_sn2();
|
|
}
|
|
|
|
void
|
|
xp_exit_sn2(void)
|
|
{
|
|
BUG_ON(!is_shub());
|
|
|
|
xp_unregister_nofault_code_sn2();
|
|
}
|
|
|