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.
6 * Copyright (c) Russ Anderson <rja@sgi.com>
10 #include <linux/export.h>
11 #include <linux/slab.h>
14 #include <asm/uv/bios.h>
15 #include <asm/uv/uv_hub.h>
17 unsigned long uv_systab_phys __ro_after_init = EFI_INVALID_TABLE_ADDR;
19 struct uv_systab *uv_systab;
21 static s64 __uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
24 struct uv_systab *tab = uv_systab;
27 if (!tab || !tab->function)
29 * BIOS does not support UV systab
31 return BIOS_STATUS_UNIMPLEMENTED;
34 * If EFI_OLD_MEMMAP is set, we need to fall back to using our old EFI
35 * callback method, which uses efi_call() directly, with the kernel page tables:
37 if (unlikely(efi_enabled(EFI_OLD_MEMMAP)))
38 ret = efi_call((void *)__va(tab->function), (u64)which, a1, a2, a3, a4, a5);
40 ret = efi_call_virt_pointer(tab, function, (u64)which, a1, a2, a3, a4, a5);
45 s64 uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
49 if (down_interruptible(&__efi_uv_runtime_lock))
50 return BIOS_STATUS_ABORT;
52 ret = __uv_bios_call(which, a1, a2, a3, a4, a5);
53 up(&__efi_uv_runtime_lock);
57 EXPORT_SYMBOL_GPL(uv_bios_call);
59 s64 uv_bios_call_irqsave(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
62 unsigned long bios_flags;
65 if (down_interruptible(&__efi_uv_runtime_lock))
66 return BIOS_STATUS_ABORT;
68 local_irq_save(bios_flags);
69 ret = __uv_bios_call(which, a1, a2, a3, a4, a5);
70 local_irq_restore(bios_flags);
72 up(&__efi_uv_runtime_lock);
79 EXPORT_SYMBOL_GPL(sn_partition_id);
81 EXPORT_SYMBOL_GPL(sn_coherency_id);
83 EXPORT_SYMBOL_GPL(sn_region_size);
84 long system_serial_number;
85 EXPORT_SYMBOL_GPL(system_serial_number);
87 EXPORT_SYMBOL_GPL(uv_type);
90 s64 uv_bios_get_sn_info(int fc, int *uvtype, long *partid, long *coher,
91 long *region, long *ssn)
95 union partition_info_u part;
97 ret = uv_bios_call_irqsave(UV_BIOS_GET_SN_INFO, fc,
98 (u64)(&v0), (u64)(&v1), 0, 0);
99 if (ret != BIOS_STATUS_SUCCESS)
104 *uvtype = part.hub_version;
106 *partid = part.partition_id;
108 *coher = part.coherence_id;
110 *region = part.region_size;
115 EXPORT_SYMBOL_GPL(uv_bios_get_sn_info);
118 uv_bios_mq_watchlist_alloc(unsigned long addr, unsigned int mq_size,
119 unsigned long *intr_mmr_offset)
125 * bios returns watchlist number or negative error number.
127 ret = (int)uv_bios_call_irqsave(UV_BIOS_WATCHLIST_ALLOC, addr,
128 mq_size, (u64)intr_mmr_offset,
130 if (ret < BIOS_STATUS_SUCCESS)
135 EXPORT_SYMBOL_GPL(uv_bios_mq_watchlist_alloc);
138 uv_bios_mq_watchlist_free(int blade, int watchlist_num)
140 return (int)uv_bios_call_irqsave(UV_BIOS_WATCHLIST_FREE,
141 blade, watchlist_num, 0, 0, 0);
143 EXPORT_SYMBOL_GPL(uv_bios_mq_watchlist_free);
146 uv_bios_change_memprotect(u64 paddr, u64 len, enum uv_memprotect perms)
148 return uv_bios_call_irqsave(UV_BIOS_MEMPROTECT, paddr, len,
151 EXPORT_SYMBOL_GPL(uv_bios_change_memprotect);
154 uv_bios_reserved_page_pa(u64 buf, u64 *cookie, u64 *addr, u64 *len)
156 return uv_bios_call_irqsave(UV_BIOS_GET_PARTITION_ADDR, (u64)cookie,
157 (u64)addr, buf, (u64)len, 0);
159 EXPORT_SYMBOL_GPL(uv_bios_reserved_page_pa);
161 s64 uv_bios_freq_base(u64 clock_type, u64 *ticks_per_second)
163 return uv_bios_call(UV_BIOS_FREQ_BASE, clock_type,
164 (u64)ticks_per_second, 0, 0, 0);
166 EXPORT_SYMBOL_GPL(uv_bios_freq_base);
169 * uv_bios_set_legacy_vga_target - Set Legacy VGA I/O Target
170 * @decode: true to enable target, false to disable target
171 * @domain: PCI domain number
172 * @bus: PCI bus number
176 * -EINVAL: Invalid domain or bus number
177 * -ENOSYS: Capability not available
178 * -EBUSY: Legacy VGA I/O cannot be retargeted at this time
180 int uv_bios_set_legacy_vga_target(bool decode, int domain, int bus)
182 return uv_bios_call(UV_BIOS_SET_LEGACY_VGA_TARGET,
183 (u64)decode, (u64)domain, (u64)bus, 0, 0);
185 EXPORT_SYMBOL_GPL(uv_bios_set_legacy_vga_target);
187 void uv_bios_init(void)
190 if ((uv_systab_phys == EFI_INVALID_TABLE_ADDR) ||
191 !uv_systab_phys || efi_runtime_disabled()) {
192 pr_crit("UV: UVsystab: missing\n");
196 uv_systab = ioremap(uv_systab_phys, sizeof(struct uv_systab));
197 if (!uv_systab || strncmp(uv_systab->signature, UV_SYSTAB_SIG, 4)) {
198 pr_err("UV: UVsystab: bad signature!\n");
203 /* Starting with UV4 the UV systab size is variable */
204 if (uv_systab->revision >= UV_SYSTAB_VERSION_UV4) {
205 int size = uv_systab->size;
208 uv_systab = ioremap(uv_systab_phys, size);
210 pr_err("UV: UVsystab: ioremap(%d) failed!\n", size);
214 pr_info("UV: UVsystab: Revision:%x\n", uv_systab->revision);