arch/x86/kernel/bios_uv.c

   1 /*
   2  * BIOS run time interface routines.
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; either version 2 of the License, or
   7  *  (at your option) any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *  GNU General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License
  15  *  along with this program; if not, write to the Free Software
  16  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  17  *
  18  *  Copyright (c) 2008-2009 Silicon Graphics, Inc.  All Rights Reserved.
  19  *  Copyright (c) Russ Anderson <rja@sgi.com>
  20  */
  21
  22 #include <linux/efi.h>
  23 #include <asm/efi.h>
  24 #include <linux/io.h>
  25 #include <asm/uv/bios.h>
  26 #include <asm/uv/uv_hub.h>
  27
  28 static struct uv_systab uv_systab;
  29
  30 s64 uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
  31 {
  32         struct uv_systab *tab = &uv_systab;
  33         s64 ret;
  34
  35         if (!tab->function)
  36                 /*
  37                  * BIOS does not support UV systab
  38                  */
  39                 return BIOS_STATUS_UNIMPLEMENTED;
  40
  41         ret = efi_call6((void *)__va(tab->function), (u64)which,
  42                         a1, a2, a3, a4, a5);
  43         return ret;
  44 }
  45 EXPORT_SYMBOL_GPL(uv_bios_call);
  46
  47 s64 uv_bios_call_irqsave(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
  48                                         u64 a4, u64 a5)
  49 {
  50         unsigned long bios_flags;
  51         s64 ret;
  52
  53         local_irq_save(bios_flags);
  54         ret = uv_bios_call(which, a1, a2, a3, a4, a5);
  55         local_irq_restore(bios_flags);
  56
  57         return ret;
  58 }
  59
  60 s64 uv_bios_call_reentrant(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
  61                                         u64 a4, u64 a5)
  62 {
  63         s64 ret;
  64
  65         preempt_disable();
  66         ret = uv_bios_call(which, a1, a2, a3, a4, a5);
  67         preempt_enable();
  68
  69         return ret;
  70 }
  71
  72
  73 long sn_partition_id;
  74 EXPORT_SYMBOL_GPL(sn_partition_id);
  75 long sn_coherency_id;
  76 EXPORT_SYMBOL_GPL(sn_coherency_id);
  77 long sn_region_size;
  78 EXPORT_SYMBOL_GPL(sn_region_size);
  79 long system_serial_number;
  80 EXPORT_SYMBOL_GPL(system_serial_number);
  81 int uv_type;
  82 EXPORT_SYMBOL_GPL(uv_type);
  83
  84
  85 s64 uv_bios_get_sn_info(int fc, int *uvtype, long *partid, long *coher,
  86                 long *region, long *ssn)
  87 {
  88         s64 ret;
  89         u64 v0, v1;
  90         union partition_info_u part;
  91
  92         ret = uv_bios_call_irqsave(UV_BIOS_GET_SN_INFO, fc,
  93                                 (u64)(&v0), (u64)(&v1), 0, 0);
  94         if (ret != BIOS_STATUS_SUCCESS)
  95                 return ret;
  96
  97         part.val = v0;
  98         if (uvtype)
  99                 *uvtype = part.hub_version;
 100         if (partid)
 101                 *partid = part.partition_id;
 102         if (coher)
 103                 *coher = part.coherence_id;
 104         if (region)
 105                 *region = part.region_size;
 106         if (ssn)
 107                 *ssn = v1;
 108         return ret;
 109 }
 110 EXPORT_SYMBOL_GPL(uv_bios_get_sn_info);
 111
 112 int
 113 uv_bios_mq_watchlist_alloc(unsigned long addr, unsigned int mq_size,
 114                            unsigned long *intr_mmr_offset)
 115 {
 116         u64 watchlist;
 117         s64 ret;
 118
 119         /*
 120          * bios returns watchlist number or negative error number.
 121          */
 122         ret = (int)uv_bios_call_irqsave(UV_BIOS_WATCHLIST_ALLOC, addr,
 123                         mq_size, (u64)intr_mmr_offset,
 124                         (u64)&watchlist, 0);
 125         if (ret < BIOS_STATUS_SUCCESS)
 126                 return ret;
 127
 128         return watchlist;
 129 }
 130 EXPORT_SYMBOL_GPL(uv_bios_mq_watchlist_alloc);
 131
 132 int
 133 uv_bios_mq_watchlist_free(int blade, int watchlist_num)
 134 {
 135         return (int)uv_bios_call_irqsave(UV_BIOS_WATCHLIST_FREE,
 136                                 blade, watchlist_num, 0, 0, 0);
 137 }
 138 EXPORT_SYMBOL_GPL(uv_bios_mq_watchlist_free);
 139
 140 s64
 141 uv_bios_change_memprotect(u64 paddr, u64 len, enum uv_memprotect perms)
 142 {
 143         return uv_bios_call_irqsave(UV_BIOS_MEMPROTECT, paddr, len,
 144                                         perms, 0, 0);
 145 }
 146 EXPORT_SYMBOL_GPL(uv_bios_change_memprotect);
 147
 148 s64
 149 uv_bios_reserved_page_pa(u64 buf, u64 *cookie, u64 *addr, u64 *len)
 150 {
 151         s64 ret;
 152
 153         ret = uv_bios_call_irqsave(UV_BIOS_GET_PARTITION_ADDR, (u64)cookie,
 154                                         (u64)addr, buf, (u64)len, 0);
 155         return ret;
 156 }
 157 EXPORT_SYMBOL_GPL(uv_bios_reserved_page_pa);
 158
 159 s64 uv_bios_freq_base(u64 clock_type, u64 *ticks_per_second)
 160 {
 161         return uv_bios_call(UV_BIOS_FREQ_BASE, clock_type,
 162                            (u64)ticks_per_second, 0, 0, 0);
 163 }
 164 EXPORT_SYMBOL_GPL(uv_bios_freq_base);
 165
 166 /*
 167  * uv_bios_set_legacy_vga_target - Set Legacy VGA I/O Target
 168  * @decode: true to enable target, false to disable target
 169  * @domain: PCI domain number
 170  * @bus: PCI bus number
 171  *
 172  * Returns:
 173  *    0: Success
 174  *    -EINVAL: Invalid domain or bus number
 175  *    -ENOSYS: Capability not available
 176  *    -EBUSY: Legacy VGA I/O cannot be retargeted at this time
 177  */
 178 int uv_bios_set_legacy_vga_target(bool decode, int domain, int bus)
 179 {
 180         return uv_bios_call(UV_BIOS_SET_LEGACY_VGA_TARGET,
 181                                 (u64)decode, (u64)domain, (u64)bus, 0, 0);
 182 }
 183 EXPORT_SYMBOL_GPL(uv_bios_set_legacy_vga_target);
 184
 185
 186 #ifdef CONFIG_EFI
 187 void uv_bios_init(void)
 188 {
 189         struct uv_systab *tab;
 190
 191         if ((efi.uv_systab == EFI_INVALID_TABLE_ADDR) ||
 192             (efi.uv_systab == (unsigned long)NULL)) {
 193                 printk(KERN_CRIT "No EFI UV System Table.\n");
 194                 uv_systab.function = (unsigned long)NULL;
 195                 return;
 196         }
 197
 198         tab = (struct uv_systab *)ioremap(efi.uv_systab,
 199                                         sizeof(struct uv_systab));
 200         if (strncmp(tab->signature, "UVST", 4) != 0)
 201                 printk(KERN_ERR "bad signature in UV system table!");
 202
 203         /*
 204          * Copy table to permanent spot for later use.
 205          */
 206         memcpy(&uv_systab, tab, sizeof(struct uv_systab));
 207         iounmap(tab);
 208
 209         printk(KERN_INFO "EFI UV System Table Revision %d\n",
 210                                         uv_systab.revision);
 211 }
 212 #else   /* !CONFIG_EFI */
 213
 214 void uv_bios_init(void) { }
 215 #endif