| Dean Nelson | 94bd270 | 2008-07-29 22:34:05 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved. |
| 7 | */ |
| 8 | |
| 9 | /* |
| 10 | * Cross Partition Communication (XPC) sn2-based functions. |
| 11 | * |
| 12 | * Architecture specific implementation of common functions. |
| 13 | * |
| 14 | */ |
| 15 | |
| 16 | #include <linux/kernel.h> |
| 17 | #include <asm/uncached.h> |
| 18 | #include <asm/sn/sn_sal.h> |
| 19 | #include "xpc.h" |
| 20 | |
| 21 | struct xpc_vars *xpc_vars; |
| 22 | struct xpc_vars_part *xpc_vars_part; |
| 23 | |
| 24 | static enum xp_retval |
| 25 | xpc_rsvd_page_init_sn2(struct xpc_rsvd_page *rp) |
| 26 | { |
| 27 | AMO_t *amos_page; |
| 28 | u64 nasid_array = 0; |
| 29 | int i; |
| 30 | int ret; |
| 31 | |
| 32 | xpc_vars = XPC_RP_VARS(rp); |
| 33 | |
| 34 | rp->sn.vars_pa = __pa(xpc_vars); |
| 35 | |
| 36 | xpc_vars_part = XPC_RP_VARS_PART(rp); |
| 37 | |
| 38 | /* |
| 39 | * Before clearing xpc_vars, see if a page of AMOs had been previously |
| 40 | * allocated. If not we'll need to allocate one and set permissions |
| 41 | * so that cross-partition AMOs are allowed. |
| 42 | * |
| 43 | * The allocated AMO page needs MCA reporting to remain disabled after |
| 44 | * XPC has unloaded. To make this work, we keep a copy of the pointer |
| 45 | * to this page (i.e., amos_page) in the struct xpc_vars structure, |
| 46 | * which is pointed to by the reserved page, and re-use that saved copy |
| 47 | * on subsequent loads of XPC. This AMO page is never freed, and its |
| 48 | * memory protections are never restricted. |
| 49 | */ |
| 50 | amos_page = xpc_vars->amos_page; |
| 51 | if (amos_page == NULL) { |
| 52 | amos_page = (AMO_t *)TO_AMO(uncached_alloc_page(0, 1)); |
| 53 | if (amos_page == NULL) { |
| 54 | dev_err(xpc_part, "can't allocate page of AMOs\n"); |
| 55 | return xpNoMemory; |
| 56 | } |
| 57 | |
| 58 | /* |
| 59 | * Open up AMO-R/W to cpu. This is done for Shub 1.1 systems |
| 60 | * when xpc_allow_IPI_ops() is called via xpc_hb_init(). |
| 61 | */ |
| 62 | if (!enable_shub_wars_1_1()) { |
| 63 | ret = sn_change_memprotect(ia64_tpa((u64)amos_page), |
| 64 | PAGE_SIZE, |
| 65 | SN_MEMPROT_ACCESS_CLASS_1, |
| 66 | &nasid_array); |
| 67 | if (ret != 0) { |
| 68 | dev_err(xpc_part, "can't change memory " |
| 69 | "protections\n"); |
| 70 | uncached_free_page(__IA64_UNCACHED_OFFSET | |
| 71 | TO_PHYS((u64)amos_page), 1); |
| 72 | return xpSalError; |
| 73 | } |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | /* clear xpc_vars */ |
| 78 | memset(xpc_vars, 0, sizeof(struct xpc_vars)); |
| 79 | |
| 80 | xpc_vars->version = XPC_V_VERSION; |
| 81 | xpc_vars->act_nasid = cpuid_to_nasid(0); |
| 82 | xpc_vars->act_phys_cpuid = cpu_physical_id(0); |
| 83 | xpc_vars->vars_part_pa = __pa(xpc_vars_part); |
| 84 | xpc_vars->amos_page_pa = ia64_tpa((u64)amos_page); |
| 85 | xpc_vars->amos_page = amos_page; /* save for next load of XPC */ |
| 86 | |
| 87 | /* clear xpc_vars_part */ |
| 88 | memset((u64 *)xpc_vars_part, 0, sizeof(struct xpc_vars_part) * |
| 89 | xp_max_npartitions); |
| 90 | |
| 91 | /* initialize the activate IRQ related AMO variables */ |
| 92 | for (i = 0; i < xp_nasid_mask_words; i++) |
| 93 | (void)xpc_IPI_init(XPC_ACTIVATE_IRQ_AMOS + i); |
| 94 | |
| 95 | /* initialize the engaged remote partitions related AMO variables */ |
| 96 | (void)xpc_IPI_init(XPC_ENGAGED_PARTITIONS_AMO); |
| 97 | (void)xpc_IPI_init(XPC_DISENGAGE_REQUEST_AMO); |
| 98 | |
| 99 | return xpSuccess; |
| 100 | } |
| 101 | |
| 102 | void |
| 103 | xpc_init_sn2(void) |
| 104 | { |
| 105 | xpc_rsvd_page_init = xpc_rsvd_page_init_sn2; |
| 106 | } |
| 107 | |
| 108 | void |
| 109 | xpc_exit_sn2(void) |
| 110 | { |
| 111 | } |