f8fffa4583
quad core 8 socket system will have apic id lifting.the apic id range could be [4, 0x23]. and apic_is_clustered_box will think that need to three clusters and that is larger than 2. So it is treated as a clustered_box. and will get: Marking TSC unstable due to TSCs unsynchronized even if the CPUs have X86_FEATURE_CONSTANT_TSC set. this quick fix will check if the cpu is from AMD. but vsmp still needs that checking... this patch is fix to make sure that vsmp not to be passed. Signed-off-by: Yinghai Lu <yinghai.lu@sun.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
130 lines
3.1 KiB
C
130 lines
3.1 KiB
C
/*
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* vSMPowered(tm) systems specific initialization
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* Copyright (C) 2005 ScaleMP Inc.
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*
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* Use of this code is subject to the terms and conditions of the
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* GNU general public license version 2. See "COPYING" or
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* http://www.gnu.org/licenses/gpl.html
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*
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* Ravikiran Thirumalai <kiran@scalemp.com>,
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* Shai Fultheim <shai@scalemp.com>
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* Paravirt ops integration: Glauber de Oliveira Costa <gcosta@redhat.com>,
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* Ravikiran Thirumalai <kiran@scalemp.com>
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*/
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#include <linux/init.h>
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#include <linux/pci_ids.h>
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#include <linux/pci_regs.h>
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#include <asm/pci-direct.h>
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#include <asm/io.h>
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#include <asm/paravirt.h>
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/*
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* Interrupt control on vSMPowered systems:
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* ~AC is a shadow of IF. If IF is 'on' AC should be 'off'
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* and vice versa.
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*/
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static unsigned long vsmp_save_fl(void)
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{
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unsigned long flags = native_save_fl();
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if (!(flags & X86_EFLAGS_IF) || (flags & X86_EFLAGS_AC))
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flags &= ~X86_EFLAGS_IF;
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return flags;
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}
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static void vsmp_restore_fl(unsigned long flags)
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{
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if (flags & X86_EFLAGS_IF)
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flags &= ~X86_EFLAGS_AC;
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else
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flags |= X86_EFLAGS_AC;
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native_restore_fl(flags);
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}
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static void vsmp_irq_disable(void)
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{
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unsigned long flags = native_save_fl();
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native_restore_fl((flags & ~X86_EFLAGS_IF) | X86_EFLAGS_AC);
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}
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static void vsmp_irq_enable(void)
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{
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unsigned long flags = native_save_fl();
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native_restore_fl((flags | X86_EFLAGS_IF) & (~X86_EFLAGS_AC));
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}
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static unsigned __init vsmp_patch(u8 type, u16 clobbers, void *ibuf,
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unsigned long addr, unsigned len)
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{
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switch (type) {
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case PARAVIRT_PATCH(pv_irq_ops.irq_enable):
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case PARAVIRT_PATCH(pv_irq_ops.irq_disable):
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case PARAVIRT_PATCH(pv_irq_ops.save_fl):
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case PARAVIRT_PATCH(pv_irq_ops.restore_fl):
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return paravirt_patch_default(type, clobbers, ibuf, addr, len);
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default:
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return native_patch(type, clobbers, ibuf, addr, len);
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}
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}
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static int vsmp = -1;
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int is_vsmp_box(void)
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{
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if (vsmp != -1)
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return vsmp;
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vsmp = 0;
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if (!early_pci_allowed())
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return vsmp;
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/* Check if we are running on a ScaleMP vSMP box */
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if (read_pci_config(0, 0x1f, 0, PCI_VENDOR_ID) ==
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(PCI_VENDOR_ID_SCALEMP || (PCI_DEVICE_ID_SCALEMP_VSMP_CTL << 16)))
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vsmp = 1;
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return vsmp;
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}
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void __init vsmp_init(void)
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{
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void *address;
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unsigned int cap, ctl, cfg;
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if (!is_vsmp_box())
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return;
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if (!early_pci_allowed())
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return;
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/* If we are, use the distinguished irq functions */
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pv_irq_ops.irq_disable = vsmp_irq_disable;
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pv_irq_ops.irq_enable = vsmp_irq_enable;
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pv_irq_ops.save_fl = vsmp_save_fl;
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pv_irq_ops.restore_fl = vsmp_restore_fl;
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pv_init_ops.patch = vsmp_patch;
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/* set vSMP magic bits to indicate vSMP capable kernel */
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cfg = read_pci_config(0, 0x1f, 0, PCI_BASE_ADDRESS_0);
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address = early_ioremap(cfg, 8);
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cap = readl(address);
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ctl = readl(address + 4);
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printk(KERN_INFO "vSMP CTL: capabilities:0x%08x control:0x%08x\n",
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cap, ctl);
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if (cap & ctl & (1 << 4)) {
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/* Turn on vSMP IRQ fastpath handling (see system.h) */
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ctl &= ~(1 << 4);
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writel(ctl, address + 4);
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ctl = readl(address + 4);
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printk(KERN_INFO "vSMP CTL: control set to:0x%08x\n", ctl);
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}
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early_iounmap(address, 8);
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return;
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}
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