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Linux/arch/x86/platform/uv/bios_uv.c

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  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
222 

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