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 
__uv_bios_call(enum uv_bios_cmd which,u64 a1,u64 a2,u64 a3,u64 a4,u64 a5)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 
uv_bios_call(enum uv_bios_cmd which,u64 a1,u64 a2,u64 a3,u64 a4,u64 a5)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 
uv_bios_call_irqsave(enum uv_bios_cmd which,u64 a1,u64 a2,u64 a3,u64 a4,u64 a5)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 
uv_bios_get_sn_info(int fc,int * uvtype,long * partid,long * coher,long * region,long * ssn)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
uv_bios_mq_watchlist_alloc(unsigned long addr,unsigned int mq_size,unsigned long * intr_mmr_offset)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
uv_bios_mq_watchlist_free(int blade,int watchlist_num)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
uv_bios_change_memprotect(u64 paddr,u64 len,enum uv_memprotect perms)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
uv_bios_reserved_page_pa(u64 buf,u64 * cookie,u64 * addr,u64 * len)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 
uv_bios_freq_base(u64 clock_type,u64 * ticks_per_second)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  */
uv_bios_set_legacy_vga_target(bool decode,int domain,int bus)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 
uv_bios_get_master_nasid(u64 size,u64 * master_nasid)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 
uv_bios_get_heapsize(u64 nasid,u64 size,u64 * heap_size)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 
uv_bios_install_heap(u64 nasid,u64 heap_size,u64 * bios_heap)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 
uv_bios_obj_count(u64 nasid,u64 size,u64 * objcnt)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 
uv_bios_enum_objs(u64 nasid,u64 size,u64 * objbuf)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 
uv_bios_enum_ports(u64 nasid,u64 obj_id,u64 size,u64 * portbuf)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 
uv_bios_get_geoinfo(u64 nasid,u64 size,u64 * buf)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 
uv_bios_get_pci_topology(u64 size,u64 * buf)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 
get_uv_systab_phys(bool msg)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 
uv_bios_init(void)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