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
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