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 static s64 __uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
  33                         u64 a4, u64 a5)
  34 {
  35         struct uv_systab *tab = uv_systab;
  36         s64 ret;
  37
  38         if (!tab || !tab->function)
  39                 /*
  40                  * BIOS does not support UV systab
  41                  */
  42                 return BIOS_STATUS_UNIMPLEMENTED;
  43
  44         /*
  45          * If EFI_OLD_MEMMAP is set, we need to fall back to using our old EFI
  46          * callback method, which uses efi_call() directly, with the kernel page tables:
  47          */
  48         if (unlikely(test_bit(EFI_OLD_MEMMAP, &efi.flags)))
  49                 ret = efi_call((void *)__va(tab->function), (u64)which, a1, a2, a3, a4, a5);
  50         else
  51                 ret = efi_call_virt_pointer(tab, function, (u64)which, a1, a2, a3, a4, a5);
  52
  53         return ret;
  54 }
  55
  56 s64 uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
  57 {
  58         s64 ret;
  59
  60         if (down_interruptible(&__efi_uv_runtime_lock))
  61                 return BIOS_STATUS_ABORT;
  62
  63         ret = __uv_bios_call(which, a1, a2, a3, a4, a5);
  64         up(&__efi_uv_runtime_lock);
  65
  66         return ret;
  67 }
  68 EXPORT_SYMBOL_GPL(uv_bios_call);
  69
  70 s64 uv_bios_call_irqsave(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
  71                                         u64 a4, u64 a5)
  72 {
  73         unsigned long bios_flags;
  74         s64 ret;
  75
  76         if (down_interruptible(&__efi_uv_runtime_lock))
  77                 return BIOS_STATUS_ABORT;
  78
  79         local_irq_save(bios_flags);
  80         ret = __uv_bios_call(which, a1, a2, a3, a4, a5);
  81         local_irq_restore(bios_flags);
  82
  83         up(&__efi_uv_runtime_lock);
  84
  85         return ret;
  86 }
  87
  88 s64 uv_bios_call_reentrant(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
  89                                         u64 a4, u64 a5)
  90 {
  91         s64 ret;
  92
  93         preempt_disable();
  94         ret = uv_bios_call(which, a1, a2, a3, a4, a5);
  95         preempt_enable();
  96
  97         return ret;
  98 }
  99
 100
 101 long sn_partition_id;
 102 EXPORT_SYMBOL_GPL(sn_partition_id);
 103 long sn_coherency_id;
 104 EXPORT_SYMBOL_GPL(sn_coherency_id);
 105 long sn_region_size;
 106 EXPORT_SYMBOL_GPL(sn_region_size);
 107 long system_serial_number;
 108 EXPORT_SYMBOL_GPL(system_serial_number);
 109 int uv_type;
 110 EXPORT_SYMBOL_GPL(uv_type);
 111
 112
 113 s64 uv_bios_get_sn_info(int fc, int *uvtype, long *partid, long *coher,
 114                 long *region, long *ssn)
 115 {
 116         s64 ret;
 117         u64 v0, v1;
 118         union partition_info_u part;
 119
 120         ret = uv_bios_call_irqsave(UV_BIOS_GET_SN_INFO, fc,
 121                                 (u64)(&v0), (u64)(&v1), 0, 0);
 122         if (ret != BIOS_STATUS_SUCCESS)
 123                 return ret;
 124
 125         part.val = v0;
 126         if (uvtype)
 127                 *uvtype = part.hub_version;
 128         if (partid)
 129                 *partid = part.partition_id;
 130         if (coher)
 131                 *coher = part.coherence_id;
 132         if (region)
 133                 *region = part.region_size;
 134         if (ssn)
 135                 *ssn = v1;
 136         return ret;
 137 }
 138 EXPORT_SYMBOL_GPL(uv_bios_get_sn_info);
 139
 140 int
 141 uv_bios_mq_watchlist_alloc(unsigned long addr, unsigned int mq_size,
 142                            unsigned long *intr_mmr_offset)
 143 {
 144         u64 watchlist;
 145         s64 ret;
 146
 147         /*
 148          * bios returns watchlist number or negative error number.
 149          */
 150         ret = (int)uv_bios_call_irqsave(UV_BIOS_WATCHLIST_ALLOC, addr,
 151                         mq_size, (u64)intr_mmr_offset,
 152                         (u64)&watchlist, 0);
 153         if (ret < BIOS_STATUS_SUCCESS)
 154                 return ret;
 155
 156         return watchlist;
 157 }
 158 EXPORT_SYMBOL_GPL(uv_bios_mq_watchlist_alloc);
 159
 160 int
 161 uv_bios_mq_watchlist_free(int blade, int watchlist_num)
 162 {
 163         return (int)uv_bios_call_irqsave(UV_BIOS_WATCHLIST_FREE,
 164                                 blade, watchlist_num, 0, 0, 0);
 165 }
 166 EXPORT_SYMBOL_GPL(uv_bios_mq_watchlist_free);
 167
 168 s64
 169 uv_bios_change_memprotect(u64 paddr, u64 len, enum uv_memprotect perms)
 170 {
 171         return uv_bios_call_irqsave(UV_BIOS_MEMPROTECT, paddr, len,
 172                                         perms, 0, 0);
 173 }
 174 EXPORT_SYMBOL_GPL(uv_bios_change_memprotect);
 175
 176 s64
 177 uv_bios_reserved_page_pa(u64 buf, u64 *cookie, u64 *addr, u64 *len)
 178 {
 179         return uv_bios_call_irqsave(UV_BIOS_GET_PARTITION_ADDR, (u64)cookie,
 180                                     (u64)addr, buf, (u64)len, 0);
 181 }
 182 EXPORT_SYMBOL_GPL(uv_bios_reserved_page_pa);
 183
 184 s64 uv_bios_freq_base(u64 clock_type, u64 *ticks_per_second)
 185 {
 186         return uv_bios_call(UV_BIOS_FREQ_BASE, clock_type,
 187                            (u64)ticks_per_second, 0, 0, 0);
 188 }
 189 EXPORT_SYMBOL_GPL(uv_bios_freq_base);
 190
 191 /*
 192  * uv_bios_set_legacy_vga_target - Set Legacy VGA I/O Target
 193  * @decode: true to enable target, false to disable target
 194  * @domain: PCI domain number
 195  * @bus: PCI bus number
 196  *
 197  * Returns:
 198  *    0: Success
 199  *    -EINVAL: Invalid domain or bus number
 200  *    -ENOSYS: Capability not available
 201  *    -EBUSY: Legacy VGA I/O cannot be retargeted at this time
 202  */
 203 int uv_bios_set_legacy_vga_target(bool decode, int domain, int bus)
 204 {
 205         return uv_bios_call(UV_BIOS_SET_LEGACY_VGA_TARGET,
 206                                 (u64)decode, (u64)domain, (u64)bus, 0, 0);
 207 }
 208 EXPORT_SYMBOL_GPL(uv_bios_set_legacy_vga_target);
 209
 210 #ifdef CONFIG_EFI
 211 void uv_bios_init(void)
 212 {
 213         uv_systab = NULL;
 214         if ((efi.uv_systab == EFI_INVALID_TABLE_ADDR) ||
 215             !efi.uv_systab || efi_runtime_disabled()) {
 216                 pr_crit("UV: UVsystab: missing\n");
 217                 return;
 218         }
 219
 220         uv_systab = ioremap(efi.uv_systab, sizeof(struct uv_systab));
 221         if (!uv_systab || strncmp(uv_systab->signature, UV_SYSTAB_SIG, 4)) {
 222                 pr_err("UV: UVsystab: bad signature!\n");
 223                 iounmap(uv_systab);
 224                 return;
 225         }
 226
 227         /* Starting with UV4 the UV systab size is variable */
 228         if (uv_systab->revision >= UV_SYSTAB_VERSION_UV4) {
 229                 int size = uv_systab->size;
 230
 231                 iounmap(uv_systab);
 232                 uv_systab = ioremap(efi.uv_systab, size);
 233                 if (!uv_systab) {
 234                         pr_err("UV: UVsystab: ioremap(%d) failed!\n", size);
 235                         return;
 236                 }
 237         }
 238         pr_info("UV: UVsystab: Revision:%x\n", uv_systab->revision);
 239 }
 240 #endif