arch/x86/platform/uv/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 <linux/export.h>
  24 #include <linux/slab.h>
  25 #include <asm/efi.h>
  26 #include <linux/io.h>
  27 #include <asm/uv/bios.h>
  28 #include <asm/uv/uv_hub.h>
  29
  30 struct uv_systab *uv_systab;
  31
  32 s64 uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
  33 {
  34         struct uv_systab *tab = uv_systab;
  35         s64 ret;
  36
  37         if (!tab || !tab->function)
  38                 /*
  39                  * BIOS does not support UV systab
  40                  */
  41                 return BIOS_STATUS_UNIMPLEMENTED;
  42
  43         /*
  44          * If EFI_OLD_MEMMAP is set, we need to fall back to using our old EFI
  45          * callback method, which uses efi_call() directly, with the kernel page tables:
  46          */
  47         if (unlikely(test_bit(EFI_OLD_MEMMAP, &efi.flags)))
  48                 ret = efi_call((void *)__va(tab->function), (u64)which, a1, a2, a3, a4, a5);
  49         else
  50                 ret = efi_call_virt_pointer(tab, function, (u64)which, a1, a2, a3, a4, a5);
  51
  52         return ret;
  53 }
  54 EXPORT_SYMBOL_GPL(uv_bios_call);
  55
  56 s64 uv_bios_call_irqsave(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
  57                                         u64 a4, u64 a5)
  58 {
  59         unsigned long bios_flags;
  60         s64 ret;
  61
  62         local_irq_save(bios_flags);
  63         ret = uv_bios_call(which, a1, a2, a3, a4, a5);
  64         local_irq_restore(bios_flags);
  65
  66         return ret;
  67 }
  68
  69 s64 uv_bios_call_reentrant(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
  70                                         u64 a4, u64 a5)
  71 {
  72         s64 ret;
  73
  74         preempt_disable();
  75         ret = uv_bios_call(which, a1, a2, a3, a4, a5);
  76         preempt_enable();
  77
  78         return ret;
  79 }
  80
  81
  82 long sn_partition_id;
  83 EXPORT_SYMBOL_GPL(sn_partition_id);
  84 long sn_coherency_id;
  85 EXPORT_SYMBOL_GPL(sn_coherency_id);
  86 long sn_region_size;
  87 EXPORT_SYMBOL_GPL(sn_region_size);
  88 long system_serial_number;
  89 EXPORT_SYMBOL_GPL(system_serial_number);
  90 int uv_type;
  91 EXPORT_SYMBOL_GPL(uv_type);
  92
  93
  94 s64 uv_bios_get_sn_info(int fc, int *uvtype, long *partid, long *coher,
  95                 long *region, long *ssn)
  96 {
  97         s64 ret;
  98         u64 v0, v1;
  99         union partition_info_u part;
 100
 101         ret = uv_bios_call_irqsave(UV_BIOS_GET_SN_INFO, fc,
 102                                 (u64)(&v0), (u64)(&v1), 0, 0);
 103         if (ret != BIOS_STATUS_SUCCESS)
 104                 return ret;
 105
 106         part.val = v0;
 107         if (uvtype)
 108                 *uvtype = part.hub_version;
 109         if (partid)
 110                 *partid = part.partition_id;
 111         if (coher)
 112                 *coher = part.coherence_id;
 113         if (region)
 114                 *region = part.region_size;
 115         if (ssn)
 116                 *ssn = v1;
 117         return ret;
 118 }
 119 EXPORT_SYMBOL_GPL(uv_bios_get_sn_info);
 120
 121 int
 122 uv_bios_mq_watchlist_alloc(unsigned long addr, unsigned int mq_size,
 123                            unsigned long *intr_mmr_offset)
 124 {
 125         u64 watchlist;
 126         s64 ret;
 127
 128         /*
 129          * bios returns watchlist number or negative error number.
 130          */
 131         ret = (int)uv_bios_call_irqsave(UV_BIOS_WATCHLIST_ALLOC, addr,
 132                         mq_size, (u64)intr_mmr_offset,
 133                         (u64)&watchlist, 0);
 134         if (ret < BIOS_STATUS_SUCCESS)
 135                 return ret;
 136
 137         return watchlist;
 138 }
 139 EXPORT_SYMBOL_GPL(uv_bios_mq_watchlist_alloc);
 140
 141 int
 142 uv_bios_mq_watchlist_free(int blade, int watchlist_num)
 143 {
 144         return (int)uv_bios_call_irqsave(UV_BIOS_WATCHLIST_FREE,
 145                                 blade, watchlist_num, 0, 0, 0);
 146 }
 147 EXPORT_SYMBOL_GPL(uv_bios_mq_watchlist_free);
 148
 149 s64
 150 uv_bios_change_memprotect(u64 paddr, u64 len, enum uv_memprotect perms)
 151 {
 152         return uv_bios_call_irqsave(UV_BIOS_MEMPROTECT, paddr, len,
 153                                         perms, 0, 0);
 154 }
 155 EXPORT_SYMBOL_GPL(uv_bios_change_memprotect);
 156
 157 s64
 158 uv_bios_reserved_page_pa(u64 buf, u64 *cookie, u64 *addr, u64 *len)
 159 {
 160         return uv_bios_call_irqsave(UV_BIOS_GET_PARTITION_ADDR, (u64)cookie,
 161                                     (u64)addr, buf, (u64)len, 0);
 162 }
 163 EXPORT_SYMBOL_GPL(uv_bios_reserved_page_pa);
 164
 165 s64 uv_bios_freq_base(u64 clock_type, u64 *ticks_per_second)
 166 {
 167         return uv_bios_call(UV_BIOS_FREQ_BASE, clock_type,
 168                            (u64)ticks_per_second, 0, 0, 0);
 169 }
 170 EXPORT_SYMBOL_GPL(uv_bios_freq_base);
 171
 172 /*
 173  * uv_bios_set_legacy_vga_target - Set Legacy VGA I/O Target
 174  * @decode: true to enable target, false to disable target
 175  * @domain: PCI domain number
 176  * @bus: PCI bus number
 177  *
 178  * Returns:
 179  *    0: Success
 180  *    -EINVAL: Invalid domain or bus number
 181  *    -ENOSYS: Capability not available
 182  *    -EBUSY: Legacy VGA I/O cannot be retargeted at this time
 183  */
 184 int uv_bios_set_legacy_vga_target(bool decode, int domain, int bus)
 185 {
 186         return uv_bios_call(UV_BIOS_SET_LEGACY_VGA_TARGET,
 187                                 (u64)decode, (u64)domain, (u64)bus, 0, 0);
 188 }
 189 EXPORT_SYMBOL_GPL(uv_bios_set_legacy_vga_target);
 190
 191 #ifdef CONFIG_EFI
 192 void uv_bios_init(void)
 193 {
 194         uv_systab = NULL;
 195         if ((efi.uv_systab == EFI_INVALID_TABLE_ADDR) ||
 196             !efi.uv_systab || efi_runtime_disabled()) {
 197                 pr_crit("UV: UVsystab: missing\n");
 198                 return;
 199         }
 200
 201         uv_systab = ioremap(efi.uv_systab, sizeof(struct uv_systab));
 202         if (!uv_systab || strncmp(uv_systab->signature, UV_SYSTAB_SIG, 4)) {
 203                 pr_err("UV: UVsystab: bad signature!\n");
 204                 iounmap(uv_systab);
 205                 return;
 206         }
 207
 208         /* Starting with UV4 the UV systab size is variable */
 209         if (uv_systab->revision >= UV_SYSTAB_VERSION_UV4) {
 210                 int size = uv_systab->size;
 211
 212                 iounmap(uv_systab);
 213                 uv_systab = ioremap(efi.uv_systab, size);
 214                 if (!uv_systab) {
 215                         pr_err("UV: UVsystab: ioremap(%d) failed!\n", size);
 216                         return;
 217                 }
 218         }
 219         pr_info("UV: UVsystab: Revision:%x\n", uv_systab->revision);
 220 }
 221 #endif