241 lines
6 KiB
C
241 lines
6 KiB
C
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/*
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* BIOS run time interface routines.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Copyright (c) 2008-2009 Silicon Graphics, Inc. All Rights Reserved.
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* Copyright (c) Russ Anderson <rja@sgi.com>
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*/
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#include <linux/efi.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <asm/efi.h>
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#include <linux/io.h>
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#include <asm/uv/bios.h>
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#include <asm/uv/uv_hub.h>
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struct uv_systab *uv_systab;
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static s64 __uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
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u64 a4, u64 a5)
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{
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struct uv_systab *tab = uv_systab;
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s64 ret;
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if (!tab || !tab->function)
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/*
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* BIOS does not support UV systab
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*/
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return BIOS_STATUS_UNIMPLEMENTED;
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/*
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* If EFI_OLD_MEMMAP is set, we need to fall back to using our old EFI
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* callback method, which uses efi_call() directly, with the kernel page tables:
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*/
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if (unlikely(test_bit(EFI_OLD_MEMMAP, &efi.flags)))
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ret = efi_call((void *)__va(tab->function), (u64)which, a1, a2, a3, a4, a5);
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else
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ret = efi_call_virt_pointer(tab, function, (u64)which, a1, a2, a3, a4, a5);
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return ret;
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}
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s64 uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
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{
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s64 ret;
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if (down_interruptible(&__efi_uv_runtime_lock))
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return BIOS_STATUS_ABORT;
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ret = __uv_bios_call(which, a1, a2, a3, a4, a5);
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up(&__efi_uv_runtime_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(uv_bios_call);
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s64 uv_bios_call_irqsave(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
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u64 a4, u64 a5)
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{
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unsigned long bios_flags;
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s64 ret;
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if (down_interruptible(&__efi_uv_runtime_lock))
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return BIOS_STATUS_ABORT;
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local_irq_save(bios_flags);
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ret = __uv_bios_call(which, a1, a2, a3, a4, a5);
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local_irq_restore(bios_flags);
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up(&__efi_uv_runtime_lock);
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return ret;
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}
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s64 uv_bios_call_reentrant(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
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u64 a4, u64 a5)
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{
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s64 ret;
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preempt_disable();
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ret = uv_bios_call(which, a1, a2, a3, a4, a5);
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preempt_enable();
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return ret;
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}
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long sn_partition_id;
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EXPORT_SYMBOL_GPL(sn_partition_id);
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long sn_coherency_id;
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EXPORT_SYMBOL_GPL(sn_coherency_id);
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long sn_region_size;
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EXPORT_SYMBOL_GPL(sn_region_size);
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long system_serial_number;
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EXPORT_SYMBOL_GPL(system_serial_number);
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int uv_type;
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EXPORT_SYMBOL_GPL(uv_type);
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s64 uv_bios_get_sn_info(int fc, int *uvtype, long *partid, long *coher,
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long *region, long *ssn)
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{
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s64 ret;
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u64 v0, v1;
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union partition_info_u part;
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ret = uv_bios_call_irqsave(UV_BIOS_GET_SN_INFO, fc,
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(u64)(&v0), (u64)(&v1), 0, 0);
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if (ret != BIOS_STATUS_SUCCESS)
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return ret;
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part.val = v0;
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if (uvtype)
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*uvtype = part.hub_version;
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if (partid)
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*partid = part.partition_id;
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if (coher)
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*coher = part.coherence_id;
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if (region)
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*region = part.region_size;
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if (ssn)
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*ssn = v1;
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return ret;
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}
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EXPORT_SYMBOL_GPL(uv_bios_get_sn_info);
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int
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uv_bios_mq_watchlist_alloc(unsigned long addr, unsigned int mq_size,
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unsigned long *intr_mmr_offset)
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{
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u64 watchlist;
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s64 ret;
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/*
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* bios returns watchlist number or negative error number.
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*/
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ret = (int)uv_bios_call_irqsave(UV_BIOS_WATCHLIST_ALLOC, addr,
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mq_size, (u64)intr_mmr_offset,
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(u64)&watchlist, 0);
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if (ret < BIOS_STATUS_SUCCESS)
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return ret;
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return watchlist;
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}
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EXPORT_SYMBOL_GPL(uv_bios_mq_watchlist_alloc);
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int
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uv_bios_mq_watchlist_free(int blade, int watchlist_num)
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{
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return (int)uv_bios_call_irqsave(UV_BIOS_WATCHLIST_FREE,
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blade, watchlist_num, 0, 0, 0);
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}
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EXPORT_SYMBOL_GPL(uv_bios_mq_watchlist_free);
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s64
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uv_bios_change_memprotect(u64 paddr, u64 len, enum uv_memprotect perms)
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{
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return uv_bios_call_irqsave(UV_BIOS_MEMPROTECT, paddr, len,
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perms, 0, 0);
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}
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EXPORT_SYMBOL_GPL(uv_bios_change_memprotect);
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s64
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uv_bios_reserved_page_pa(u64 buf, u64 *cookie, u64 *addr, u64 *len)
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{
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return uv_bios_call_irqsave(UV_BIOS_GET_PARTITION_ADDR, (u64)cookie,
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(u64)addr, buf, (u64)len, 0);
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}
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EXPORT_SYMBOL_GPL(uv_bios_reserved_page_pa);
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s64 uv_bios_freq_base(u64 clock_type, u64 *ticks_per_second)
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{
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return uv_bios_call(UV_BIOS_FREQ_BASE, clock_type,
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(u64)ticks_per_second, 0, 0, 0);
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}
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EXPORT_SYMBOL_GPL(uv_bios_freq_base);
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/*
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* uv_bios_set_legacy_vga_target - Set Legacy VGA I/O Target
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* @decode: true to enable target, false to disable target
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* @domain: PCI domain number
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* @bus: PCI bus number
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*
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* Returns:
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* 0: Success
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* -EINVAL: Invalid domain or bus number
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* -ENOSYS: Capability not available
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* -EBUSY: Legacy VGA I/O cannot be retargeted at this time
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*/
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int uv_bios_set_legacy_vga_target(bool decode, int domain, int bus)
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{
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return uv_bios_call(UV_BIOS_SET_LEGACY_VGA_TARGET,
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(u64)decode, (u64)domain, (u64)bus, 0, 0);
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}
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EXPORT_SYMBOL_GPL(uv_bios_set_legacy_vga_target);
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#ifdef CONFIG_EFI
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void uv_bios_init(void)
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{
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uv_systab = NULL;
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if ((efi.uv_systab == EFI_INVALID_TABLE_ADDR) ||
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!efi.uv_systab || efi_runtime_disabled()) {
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pr_crit("UV: UVsystab: missing\n");
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return;
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}
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uv_systab = ioremap(efi.uv_systab, sizeof(struct uv_systab));
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if (!uv_systab || strncmp(uv_systab->signature, UV_SYSTAB_SIG, 4)) {
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pr_err("UV: UVsystab: bad signature!\n");
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iounmap(uv_systab);
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return;
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}
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/* Starting with UV4 the UV systab size is variable */
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if (uv_systab->revision >= UV_SYSTAB_VERSION_UV4) {
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int size = uv_systab->size;
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iounmap(uv_systab);
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uv_systab = ioremap(efi.uv_systab, size);
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if (!uv_systab) {
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pr_err("UV: UVsystab: ioremap(%d) failed!\n", size);
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return;
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}
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}
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pr_info("UV: UVsystab: Revision:%x\n", uv_systab->revision);
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}
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#endif
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