112 lines
3 KiB
C
112 lines
3 KiB
C
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
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*/
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/*
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* Cross Partition Communication (XPC) sn2-based functions.
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*
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* Architecture specific implementation of common functions.
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*
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*/
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#include <linux/kernel.h>
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#include <asm/uncached.h>
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#include <asm/sn/sn_sal.h>
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#include "xpc.h"
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struct xpc_vars *xpc_vars;
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struct xpc_vars_part *xpc_vars_part;
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static enum xp_retval
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xpc_rsvd_page_init_sn2(struct xpc_rsvd_page *rp)
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{
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AMO_t *amos_page;
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u64 nasid_array = 0;
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int i;
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int ret;
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xpc_vars = XPC_RP_VARS(rp);
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rp->sn.vars_pa = __pa(xpc_vars);
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xpc_vars_part = XPC_RP_VARS_PART(rp);
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/*
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* Before clearing xpc_vars, see if a page of AMOs had been previously
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* allocated. If not we'll need to allocate one and set permissions
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* so that cross-partition AMOs are allowed.
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*
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* The allocated AMO page needs MCA reporting to remain disabled after
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* XPC has unloaded. To make this work, we keep a copy of the pointer
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* to this page (i.e., amos_page) in the struct xpc_vars structure,
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* which is pointed to by the reserved page, and re-use that saved copy
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* on subsequent loads of XPC. This AMO page is never freed, and its
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* memory protections are never restricted.
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*/
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amos_page = xpc_vars->amos_page;
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if (amos_page == NULL) {
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amos_page = (AMO_t *)TO_AMO(uncached_alloc_page(0, 1));
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if (amos_page == NULL) {
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dev_err(xpc_part, "can't allocate page of AMOs\n");
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return xpNoMemory;
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}
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/*
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* Open up AMO-R/W to cpu. This is done for Shub 1.1 systems
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* when xpc_allow_IPI_ops() is called via xpc_hb_init().
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*/
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if (!enable_shub_wars_1_1()) {
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ret = sn_change_memprotect(ia64_tpa((u64)amos_page),
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PAGE_SIZE,
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SN_MEMPROT_ACCESS_CLASS_1,
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&nasid_array);
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if (ret != 0) {
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dev_err(xpc_part, "can't change memory "
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"protections\n");
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uncached_free_page(__IA64_UNCACHED_OFFSET |
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TO_PHYS((u64)amos_page), 1);
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return xpSalError;
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}
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}
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}
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/* clear xpc_vars */
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memset(xpc_vars, 0, sizeof(struct xpc_vars));
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xpc_vars->version = XPC_V_VERSION;
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xpc_vars->act_nasid = cpuid_to_nasid(0);
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xpc_vars->act_phys_cpuid = cpu_physical_id(0);
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xpc_vars->vars_part_pa = __pa(xpc_vars_part);
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xpc_vars->amos_page_pa = ia64_tpa((u64)amos_page);
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xpc_vars->amos_page = amos_page; /* save for next load of XPC */
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/* clear xpc_vars_part */
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memset((u64 *)xpc_vars_part, 0, sizeof(struct xpc_vars_part) *
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xp_max_npartitions);
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/* initialize the activate IRQ related AMO variables */
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for (i = 0; i < xp_nasid_mask_words; i++)
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(void)xpc_IPI_init(XPC_ACTIVATE_IRQ_AMOS + i);
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/* initialize the engaged remote partitions related AMO variables */
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(void)xpc_IPI_init(XPC_ENGAGED_PARTITIONS_AMO);
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(void)xpc_IPI_init(XPC_DISENGAGE_REQUEST_AMO);
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return xpSuccess;
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}
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void
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xpc_init_sn2(void)
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{
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xpc_rsvd_page_init = xpc_rsvd_page_init_sn2;
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}
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void
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xpc_exit_sn2(void)
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{
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}
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