e5699a8231
vSMP detection: access pci config space early in boot to detect if the system is a vSMPowered box, and cache the result in a flag, so that is_vsmp_box() retrieves the value of the flag always. Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
154 lines
3.4 KiB
C
154 lines
3.4 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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#if defined CONFIG_PCI && defined CONFIG_PARAVIRT
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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 void __init set_vsmp_pv_ops(void)
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{
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void *address;
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unsigned int cap, ctl, cfg;
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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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/* Setup irq ops and turn on vSMP IRQ fastpath handling */
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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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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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}
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#else
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static void __init set_vsmp_pv_ops(void)
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{
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}
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#endif
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#ifdef CONFIG_PCI
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static int is_vsmp = -1;
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static void __init detect_vsmp_box(void)
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{
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is_vsmp = 0;
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if (!early_pci_allowed())
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return;
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/* Check if we are running on a ScaleMP vSMPowered 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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is_vsmp = 1;
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}
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int is_vsmp_box(void)
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{
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if (is_vsmp != -1)
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return is_vsmp;
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else {
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WARN_ON_ONCE(1);
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return 0;
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}
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}
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#else
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static int __init detect_vsmp_box(void)
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{
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}
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int is_vsmp_box(void)
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{
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return 0;
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}
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#endif
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void __init vsmp_init(void)
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{
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detect_vsmp_box();
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if (!is_vsmp_box())
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return;
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set_vsmp_pv_ops();
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return;
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}
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