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 EXPORT_SYMBOL_GPL(sn_coherency_id); 76 long sn_region_size; 77 EXPORT_SYMBOL_GPL(sn_region_size); 78 long system_serial_number; 79 int uv_type; 80 81 s64 uv_bios_get_sn_info(int fc, int *uvtype, long *partid, long *coher, 82 long *region, long *ssn) 83 { 84 s64 ret; 85 u64 v0, v1; 86 union partition_info_u part; 87 88 ret = uv_bios_call_irqsave(UV_BIOS_GET_SN_INFO, fc, 89 (u64)(&v0), (u64)(&v1), 0, 0); 90 if (ret != BIOS_STATUS_SUCCESS) 91 return ret; 92 93 part.val = v0; 94 if (uvtype) 95 *uvtype = part.hub_version; 96 if (partid) 97 *partid = part.partition_id; 98 if (coher) 99 *coher = part.coherence_id; 100 if (region) 101 *region = part.region_size; 102 if (ssn) 103 *ssn = v1; 104 return ret; 105 } 106 107 int 108 uv_bios_mq_watchlist_alloc(unsigned long addr, unsigned int mq_size, 109 unsigned long *intr_mmr_offset) 110 { 111 u64 watchlist; 112 s64 ret; 113 114 /* 115 * bios returns watchlist number or negative error number. 116 */ 117 ret = (int)uv_bios_call_irqsave(UV_BIOS_WATCHLIST_ALLOC, addr, 118 mq_size, (u64)intr_mmr_offset, 119 (u64)&watchlist, 0); 120 if (ret < BIOS_STATUS_SUCCESS) 121 return ret; 122 123 return watchlist; 124 } 125 EXPORT_SYMBOL_GPL(uv_bios_mq_watchlist_alloc); 126 127 int 128 uv_bios_mq_watchlist_free(int blade, int watchlist_num) 129 { 130 return (int)uv_bios_call_irqsave(UV_BIOS_WATCHLIST_FREE, 131 blade, watchlist_num, 0, 0, 0); 132 } 133 EXPORT_SYMBOL_GPL(uv_bios_mq_watchlist_free); 134 135 s64 136 uv_bios_change_memprotect(u64 paddr, u64 len, enum uv_memprotect perms) 137 { 138 return uv_bios_call_irqsave(UV_BIOS_MEMPROTECT, paddr, len, 139 perms, 0, 0); 140 } 141 EXPORT_SYMBOL_GPL(uv_bios_change_memprotect); 142 143 s64 144 uv_bios_reserved_page_pa(u64 buf, u64 *cookie, u64 *addr, u64 *len) 145 { 146 return uv_bios_call_irqsave(UV_BIOS_GET_PARTITION_ADDR, (u64)cookie, 147 (u64)addr, buf, (u64)len, 0); 148 } 149 EXPORT_SYMBOL_GPL(uv_bios_reserved_page_pa); 150 151 s64 uv_bios_freq_base(u64 clock_type, u64 *ticks_per_second) 152 { 153 return uv_bios_call(UV_BIOS_FREQ_BASE, clock_type, 154 (u64)ticks_per_second, 0, 0, 0); 155 } 156 157 /* 158 * uv_bios_set_legacy_vga_target - Set Legacy VGA I/O Target 159 * @decode: true to enable target, false to disable target 160 * @domain: PCI domain number 161 * @bus: PCI bus number 162 * 163 * Returns: 164 * 0: Success 165 * -EINVAL: Invalid domain or bus number 166 * -ENOSYS: Capability not available 167 * -EBUSY: Legacy VGA I/O cannot be retargeted at this time 168 */ 169 int uv_bios_set_legacy_vga_target(bool decode, int domain, int bus) 170 { 171 return uv_bios_call(UV_BIOS_SET_LEGACY_VGA_TARGET, 172 (u64)decode, (u64)domain, (u64)bus, 0, 0); 173 } 174 175 extern s64 uv_bios_get_master_nasid(u64 size, u64 *master_nasid) 176 { 177 return uv_bios_call(UV_BIOS_EXTRA, 0, UV_BIOS_EXTRA_MASTER_NASID, 0, 178 size, (u64)master_nasid); 179 } 180 EXPORT_SYMBOL_GPL(uv_bios_get_master_nasid); 181 182 extern s64 uv_bios_get_heapsize(u64 nasid, u64 size, u64 *heap_size) 183 { 184 return uv_bios_call(UV_BIOS_EXTRA, nasid, UV_BIOS_EXTRA_GET_HEAPSIZE, 185 0, size, (u64)heap_size); 186 } 187 EXPORT_SYMBOL_GPL(uv_bios_get_heapsize); 188 189 extern s64 uv_bios_install_heap(u64 nasid, u64 heap_size, u64 *bios_heap) 190 { 191 return uv_bios_call(UV_BIOS_EXTRA, nasid, UV_BIOS_EXTRA_INSTALL_HEAP, 192 0, heap_size, (u64)bios_heap); 193 } 194 EXPORT_SYMBOL_GPL(uv_bios_install_heap); 195 196 extern s64 uv_bios_obj_count(u64 nasid, u64 size, u64 *objcnt) 197 { 198 return uv_bios_call(UV_BIOS_EXTRA, nasid, UV_BIOS_EXTRA_OBJECT_COUNT, 199 0, size, (u64)objcnt); 200 } 201 EXPORT_SYMBOL_GPL(uv_bios_obj_count); 202 203 extern s64 uv_bios_enum_objs(u64 nasid, u64 size, u64 *objbuf) 204 { 205 return uv_bios_call(UV_BIOS_EXTRA, nasid, UV_BIOS_EXTRA_ENUM_OBJECTS, 206 0, size, (u64)objbuf); 207 } 208 EXPORT_SYMBOL_GPL(uv_bios_enum_objs); 209 210 extern s64 uv_bios_enum_ports(u64 nasid, u64 obj_id, u64 size, u64 *portbuf) 211 { 212 return uv_bios_call(UV_BIOS_EXTRA, nasid, UV_BIOS_EXTRA_ENUM_PORTS, 213 obj_id, size, (u64)portbuf); 214 } 215 EXPORT_SYMBOL_GPL(uv_bios_enum_ports); 216 217 extern s64 uv_bios_get_geoinfo(u64 nasid, u64 size, u64 *buf) 218 { 219 return uv_bios_call(UV_BIOS_GET_GEOINFO, nasid, (u64)buf, size, 0, 0); 220 } 221 EXPORT_SYMBOL_GPL(uv_bios_get_geoinfo); 222 223 extern s64 uv_bios_get_pci_topology(u64 size, u64 *buf) 224 { 225 return uv_bios_call(UV_BIOS_GET_PCI_TOPOLOGY, (u64)buf, size, 0, 0, 0); 226 } 227 EXPORT_SYMBOL_GPL(uv_bios_get_pci_topology); 228 229 unsigned long get_uv_systab_phys(bool msg) 230 { 231 if ((uv_systab_phys == EFI_INVALID_TABLE_ADDR) || 232 !uv_systab_phys || efi_runtime_disabled()) { 233 if (msg) 234 pr_crit("UV: UVsystab: missing\n"); 235 return 0; 236 } 237 return uv_systab_phys; 238 } 239 240 int uv_bios_init(void) 241 { 242 unsigned long uv_systab_phys_addr; 243 244 uv_systab = NULL; 245 uv_systab_phys_addr = get_uv_systab_phys(1); 246 if (!uv_systab_phys_addr) 247 return -EEXIST; 248 249 uv_systab = ioremap(uv_systab_phys_addr, sizeof(struct uv_systab)); 250 if (!uv_systab || strncmp(uv_systab->signature, UV_SYSTAB_SIG, 4)) { 251 pr_err("UV: UVsystab: bad signature!\n"); 252 iounmap(uv_systab); 253 return -EINVAL; 254 } 255 256 /* Starting with UV4 the UV systab size is variable */ 257 if (uv_systab->revision >= UV_SYSTAB_VERSION_UV4) { 258 int size = uv_systab->size; 259 260 iounmap(uv_systab); 261 uv_systab = ioremap(uv_systab_phys_addr, size); 262 if (!uv_systab) { 263 pr_err("UV: UVsystab: ioremap(%d) failed!\n", size); 264 return -EFAULT; 265 } 266 } 267 pr_info("UV: UVsystab: Revision:%x\n", uv_systab->revision); 268 return 0; 269 } 270