From 908787db9b95f548270af18d83d62b9d2020ca10 Mon Sep 17 00:00:00 2001 From: Dean Nelson Date: Tue, 29 Jul 2008 22:34:05 -0700 Subject: sgi-xp: create a common xp_remote_memcpy() function Create a common remote memcpy function that maps to what the hardware booted supports. Signed-off-by: Dean Nelson Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/misc/sgi-xp/xp_sn2.c | 46 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) (limited to 'drivers/misc/sgi-xp/xp_sn2.c') diff --git a/drivers/misc/sgi-xp/xp_sn2.c b/drivers/misc/sgi-xp/xp_sn2.c index b92579356a6..3d553fa73f4 100644 --- a/drivers/misc/sgi-xp/xp_sn2.c +++ b/drivers/misc/sgi-xp/xp_sn2.c @@ -13,6 +13,7 @@ */ #include +#include #include #include "xp.h" @@ -72,6 +73,49 @@ xp_unregister_nofault_code_sn2(void) 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) { @@ -79,6 +123,8 @@ xp_init_sn2(void) xp_max_npartitions = XP_MAX_NPARTITIONS_SN2; + xp_remote_memcpy = xp_remote_memcpy_sn2; + return xp_register_nofault_code_sn2(); } -- cgit v1.2.3