1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * BIOS run time interface routines. 4 * 5 * (C) Copyright 2020 Hewlett Packard Enterprise Development LP 6 * Copyright (C) 2007-2017 Silicon Graphics, Inc. All rights reserved. 7 * Copyright (c) Russ Anderson <rja@sgi.com> 8 */ 9 10 #include <linux/efi.h> 11 #include <linux/export.h> 12 #include <linux/slab.h> 13 #include <asm/efi.h> 14 #include <linux/io.h> 15 #include <asm/pgalloc.h> 16 #include <asm/uv/bios.h> 17 #include <asm/uv/uv_hub.h> 18 19 unsigned long uv_systab_phys __ro_after_init = EFI_INVALID_TABLE_ADDR; 20 21 struct uv_systab *uv_systab; 22 23 static s64 __uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, 24 u64 a4, u64 a5) 25 { 26 struct uv_systab *tab = uv_systab; 27 s64 ret; 28 29 if (!tab || !tab->function) 30 /* 31 * BIOS does not support UV systab 32 */ 33 return BIOS_STATUS_UNIMPLEMENTED; 34 35 ret = efi_call_virt_pointer(tab, function, (u64)which, a1, a2, a3, a4, a5); 36 37 return ret; 38 } 39 40 static s64 uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, u64 a4, 41 u64 a5) 42 { 43 s64 ret; 44 45 if (down_interruptible(&__efi_uv_runtime_lock)) 46 return BIOS_STATUS_ABORT; 47 48 ret = __uv_bios_call(which, a1, a2, a3, a4, a5); 49 up(&__efi_uv_runtime_lock); 50 51 return ret; 52 } 53 54 static s64 uv_bios_call_irqsave(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, 55 u64 a4, u64 a5) 56 { 57 unsigned long bios_flags; 58 s64 ret; 59 60 if (down_interruptible(&__efi_uv_runtime_lock)) 61 return BIOS_STATUS_ABORT; 62 63 local_irq_save(bios_flags); 64 ret = __uv_bios_call(which, a1, a2, a3, a4, a5); 65 local_irq_restore(bios_flags); 66 67 up(&__efi_uv_runtime_lock); 68 69 return ret; 70 } 71 72 long sn_partition_id; 73 EXPORT_SYMBOL_GPL(sn_partition_id); 74 long sn_coherency_id; 75 long sn_region_size; 76 EXPORT_SYMBOL_GPL(sn_region_size); 77 long system_serial_number; 78 int uv_type; 79 80 s64 uv_bios_get_sn_info(int fc, int *uvtype, long *partid, long *coher, 81 long *region, long *ssn) 82 { 83 s64 ret; 84 u64 v0, v1; 85 union partition_info_u part; 86 87 ret = uv_bios_call_irqsave(UV_BIOS_GET_SN_INFO, fc, 88 (u64)(&v0), (u64)(&v1), 0, 0); 89 if (ret != BIOS_STATUS_SUCCESS) 90 return ret; 91 92 part.val = v0; 93 if (uvtype) 94 *uvtype = part.hub_version; 95 if (partid) 96 *partid = part.partition_id; 97 if (coher) 98 *coher = part.coherence_id; 99 if (region) 100 *region = part.region_size; 101 if (ssn) 102 *ssn = v1; 103 return ret; 104 } 105 106 int 107 uv_bios_mq_watchlist_alloc(unsigned long addr, unsigned int mq_size, 108 unsigned long *intr_mmr_offset) 109 { 110 u64 watchlist; 111 s64 ret; 112 113 /* 114 * bios returns watchlist number or negative error number. 115 */ 116 ret = (int)uv_bios_call_irqsave(UV_BIOS_WATCHLIST_ALLOC, addr, 117 mq_size, (u64)intr_mmr_offset, 118 (u64)&watchlist, 0); 119 if (ret < BIOS_STATUS_SUCCESS) 120 return ret; 121 122 return watchlist; 123 } 124 EXPORT_SYMBOL_GPL(uv_bios_mq_watchlist_alloc); 125 126 int 127 uv_bios_mq_watchlist_free(int blade, int watchlist_num) 128 { 129 return (int)uv_bios_call_irqsave(UV_BIOS_WATCHLIST_FREE, 130 blade, watchlist_num, 0, 0, 0); 131 } 132 EXPORT_SYMBOL_GPL(uv_bios_mq_watchlist_free); 133 134 s64 135 uv_bios_change_memprotect(u64 paddr, u64 len, enum uv_memprotect perms) 136 { 137 return uv_bios_call_irqsave(UV_BIOS_MEMPROTECT, paddr, len, 138 perms, 0, 0); 139 } 140 EXPORT_SYMBOL_GPL(uv_bios_change_memprotect); 141 142 s64 143 uv_bios_reserved_page_pa(u64 buf, u64 *cookie, u64 *addr, u64 *len) 144 { 145 return uv_bios_call_irqsave(UV_BIOS_GET_PARTITION_ADDR, (u64)cookie, 146 (u64)addr, buf, (u64)len, 0); 147 } 148 EXPORT_SYMBOL_GPL(uv_bios_reserved_page_pa); 149 150 s64 uv_bios_freq_base(u64 clock_type, u64 *ticks_per_second) 151 { 152 return uv_bios_call(UV_BIOS_FREQ_BASE, clock_type, 153 (u64)ticks_per_second, 0, 0, 0); 154 } 155 156 /* 157 * uv_bios_set_legacy_vga_target - Set Legacy VGA I/O Target 158 * @decode: true to enable target, false to disable target 159 * @domain: PCI domain number 160 * @bus: PCI bus number 161 * 162 * Returns: 163 * 0: Success 164 * -EINVAL: Invalid domain or bus number 165 * -ENOSYS: Capability not available 166 * -EBUSY: Legacy VGA I/O cannot be retargeted at this time 167 */ 168 int uv_bios_set_legacy_vga_target(bool decode, int domain, int bus) 169 { 170 return uv_bios_call(UV_BIOS_SET_LEGACY_VGA_TARGET, 171 (u64)decode, (u64)domain, (u64)bus, 0, 0); 172 } 173 174 unsigned long get_uv_systab_phys(bool msg) 175 { 176 if ((uv_systab_phys == EFI_INVALID_TABLE_ADDR) || 177 !uv_systab_phys || efi_runtime_disabled()) { 178 if (msg) 179 pr_crit("UV: UVsystab: missing\n"); 180 return 0; 181 } 182 return uv_systab_phys; 183 } 184 185 int uv_bios_init(void) 186 { 187 unsigned long uv_systab_phys_addr; 188 189 uv_systab = NULL; 190 uv_systab_phys_addr = get_uv_systab_phys(1); 191 if (!uv_systab_phys_addr) 192 return -EEXIST; 193 194 uv_systab = ioremap(uv_systab_phys_addr, sizeof(struct uv_systab)); 195 if (!uv_systab || strncmp(uv_systab->signature, UV_SYSTAB_SIG, 4)) { 196 pr_err("UV: UVsystab: bad signature!\n"); 197 iounmap(uv_systab); 198 return -EINVAL; 199 } 200 201 /* Starting with UV4 the UV systab size is variable */ 202 if (uv_systab->revision >= UV_SYSTAB_VERSION_UV4) { 203 int size = uv_systab->size; 204 205 iounmap(uv_systab); 206 uv_systab = ioremap(uv_systab_phys_addr, size); 207 if (!uv_systab) { 208 pr_err("UV: UVsystab: ioremap(%d) failed!\n", size); 209 return -EFAULT; 210 } 211 } 212 pr_info("UV: UVsystab: Revision:%x\n", uv_systab->revision); 213 return 0; 214 } 215