1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * BIOS run time interface routines.
5 * Copyright (c) 2008-2009 Silicon Graphics, Inc. All Rights Reserved.
10 #include <linux/export.h>
11 #include <linux/slab.h>
14 #include <asm/pgalloc.h>
15 #include <asm/uv/bios.h>
16 #include <asm/uv/uv_hub.h>
18 unsigned long uv_systab_phys __ro_after_init = EFI_INVALID_TABLE_ADDR;
20 struct uv_systab *uv_systab;
22 static s64 __uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
25 struct uv_systab *tab = uv_systab;
28 if (!tab || !tab->function)
30 * BIOS does not support UV systab
32 return BIOS_STATUS_UNIMPLEMENTED;
34 ret = efi_call_virt_pointer(tab, function, (u64)which, a1, a2, a3, a4, a5);
39 static s64 uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, u64 a4,
44 if (down_interruptible(&__efi_uv_runtime_lock))
45 return BIOS_STATUS_ABORT;
47 ret = __uv_bios_call(which, a1, a2, a3, a4, a5);
48 up(&__efi_uv_runtime_lock);
53 static s64 uv_bios_call_irqsave(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
56 unsigned long bios_flags;
59 if (down_interruptible(&__efi_uv_runtime_lock))
60 return BIOS_STATUS_ABORT;
62 local_irq_save(bios_flags);
63 ret = __uv_bios_call(which, a1, a2, a3, a4, a5);
64 local_irq_restore(bios_flags);
66 up(&__efi_uv_runtime_lock);
72 EXPORT_SYMBOL_GPL(sn_partition_id);
75 EXPORT_SYMBOL_GPL(sn_region_size);
76 long system_serial_number;
79 s64 uv_bios_get_sn_info(int fc, int *uvtype, long *partid, long *coher,
80 long *region, long *ssn)
84 union partition_info_u part;
86 ret = uv_bios_call_irqsave(UV_BIOS_GET_SN_INFO, fc,
87 (u64)(&v0), (u64)(&v1), 0, 0);
88 if (ret != BIOS_STATUS_SUCCESS)
93 *uvtype = part.hub_version;
95 *partid = part.partition_id;
97 *coher = part.coherence_id;
99 *region = part.region_size;
106 uv_bios_mq_watchlist_alloc(unsigned long addr, unsigned int mq_size,
107 unsigned long *intr_mmr_offset)
113 * bios returns watchlist number or negative error number.
115 ret = (int)uv_bios_call_irqsave(UV_BIOS_WATCHLIST_ALLOC, addr,
116 mq_size, (u64)intr_mmr_offset,
118 if (ret < BIOS_STATUS_SUCCESS)
123 EXPORT_SYMBOL_GPL(uv_bios_mq_watchlist_alloc);
126 uv_bios_mq_watchlist_free(int blade, int watchlist_num)
128 return (int)uv_bios_call_irqsave(UV_BIOS_WATCHLIST_FREE,
129 blade, watchlist_num, 0, 0, 0);
131 EXPORT_SYMBOL_GPL(uv_bios_mq_watchlist_free);
134 uv_bios_change_memprotect(u64 paddr, u64 len, enum uv_memprotect perms)
136 return uv_bios_call_irqsave(UV_BIOS_MEMPROTECT, paddr, len,
139 EXPORT_SYMBOL_GPL(uv_bios_change_memprotect);
142 uv_bios_reserved_page_pa(u64 buf, u64 *cookie, u64 *addr, u64 *len)
144 return uv_bios_call_irqsave(UV_BIOS_GET_PARTITION_ADDR, (u64)cookie,
145 (u64)addr, buf, (u64)len, 0);
147 EXPORT_SYMBOL_GPL(uv_bios_reserved_page_pa);
149 s64 uv_bios_freq_base(u64 clock_type, u64 *ticks_per_second)
151 return uv_bios_call(UV_BIOS_FREQ_BASE, clock_type,
152 (u64)ticks_per_second, 0, 0, 0);
156 * uv_bios_set_legacy_vga_target - Set Legacy VGA I/O Target
157 * @decode: true to enable target, false to disable target
158 * @domain: PCI domain number
159 * @bus: PCI bus number
163 * -EINVAL: Invalid domain or bus number
164 * -ENOSYS: Capability not available
165 * -EBUSY: Legacy VGA I/O cannot be retargeted at this time
167 int uv_bios_set_legacy_vga_target(bool decode, int domain, int bus)
169 return uv_bios_call(UV_BIOS_SET_LEGACY_VGA_TARGET,
170 (u64)decode, (u64)domain, (u64)bus, 0, 0);
173 int uv_bios_init(void)
176 if ((uv_systab_phys == EFI_INVALID_TABLE_ADDR) ||
177 !uv_systab_phys || efi_runtime_disabled()) {
178 pr_crit("UV: UVsystab: missing\n");
182 uv_systab = ioremap(uv_systab_phys, sizeof(struct uv_systab));
183 if (!uv_systab || strncmp(uv_systab->signature, UV_SYSTAB_SIG, 4)) {
184 pr_err("UV: UVsystab: bad signature!\n");
189 /* Starting with UV4 the UV systab size is variable */
190 if (uv_systab->revision >= UV_SYSTAB_VERSION_UV4) {
191 int size = uv_systab->size;
194 uv_systab = ioremap(uv_systab_phys, size);
196 pr_err("UV: UVsystab: ioremap(%d) failed!\n", size);
200 pr_info("UV: UVsystab: Revision:%x\n", uv_systab->revision);