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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 | /* * vSMPowered(tm) systems specific initialization * Copyright (C) 2005 ScaleMP Inc. * * Use of this code is subject to the terms and conditions of the * GNU general public license version 2. See "COPYING" or * http://www.gnu.org/licenses/gpl.html * * Ravikiran Thirumalai <kiran@scalemp.com>, * Shai Fultheim <shai@scalemp.com> * Paravirt ops integration: Glauber de Oliveira Costa <gcosta@redhat.com>, * Ravikiran Thirumalai <kiran@scalemp.com> */ #include <linux/init.h> #include <linux/pci_ids.h> #include <linux/pci_regs.h> #include <asm/apic.h> #include <asm/pci-direct.h> #include <asm/io.h> #include <asm/paravirt.h> #include <asm/setup.h> #if defined CONFIG_PCI && defined CONFIG_PARAVIRT /* * Interrupt control on vSMPowered systems: * ~AC is a shadow of IF. If IF is 'on' AC should be 'off' * and vice versa. */ static unsigned long vsmp_save_fl(void) { unsigned long flags = native_save_fl(); if (!(flags & X86_EFLAGS_IF) || (flags & X86_EFLAGS_AC)) flags &= ~X86_EFLAGS_IF; return flags; } static void vsmp_restore_fl(unsigned long flags) { if (flags & X86_EFLAGS_IF) flags &= ~X86_EFLAGS_AC; else flags |= X86_EFLAGS_AC; native_restore_fl(flags); } static void vsmp_irq_disable(void) { unsigned long flags = native_save_fl(); native_restore_fl((flags & ~X86_EFLAGS_IF) | X86_EFLAGS_AC); } static void vsmp_irq_enable(void) { unsigned long flags = native_save_fl(); native_restore_fl((flags | X86_EFLAGS_IF) & (~X86_EFLAGS_AC)); } static unsigned __init_or_module vsmp_patch(u8 type, u16 clobbers, void *ibuf, unsigned long addr, unsigned len) { switch (type) { case PARAVIRT_PATCH(pv_irq_ops.irq_enable): case PARAVIRT_PATCH(pv_irq_ops.irq_disable): case PARAVIRT_PATCH(pv_irq_ops.save_fl): case PARAVIRT_PATCH(pv_irq_ops.restore_fl): return paravirt_patch_default(type, clobbers, ibuf, addr, len); default: return native_patch(type, clobbers, ibuf, addr, len); } } static void __init set_vsmp_pv_ops(void) { void *address; unsigned int cap, ctl, cfg; /* set vSMP magic bits to indicate vSMP capable kernel */ cfg = read_pci_config(0, 0x1f, 0, PCI_BASE_ADDRESS_0); address = early_ioremap(cfg, 8); cap = readl(address); ctl = readl(address + 4); printk(KERN_INFO "vSMP CTL: capabilities:0x%08x control:0x%08x\n", cap, ctl); if (cap & ctl & (1 << 4)) { /* Setup irq ops and turn on vSMP IRQ fastpath handling */ pv_irq_ops.irq_disable = vsmp_irq_disable; pv_irq_ops.irq_enable = vsmp_irq_enable; pv_irq_ops.save_fl = vsmp_save_fl; pv_irq_ops.restore_fl = vsmp_restore_fl; pv_init_ops.patch = vsmp_patch; ctl &= ~(1 << 4); writel(ctl, address + 4); ctl = readl(address + 4); printk(KERN_INFO "vSMP CTL: control set to:0x%08x\n", ctl); } early_iounmap(address, 8); } #else static void __init set_vsmp_pv_ops(void) { } #endif #ifdef CONFIG_PCI static int is_vsmp = -1; static void __init detect_vsmp_box(void) { is_vsmp = 0; if (!early_pci_allowed()) return; /* Check if we are running on a ScaleMP vSMPowered box */ if (read_pci_config(0, 0x1f, 0, PCI_VENDOR_ID) == (PCI_VENDOR_ID_SCALEMP | (PCI_DEVICE_ID_SCALEMP_VSMP_CTL << 16))) is_vsmp = 1; } int is_vsmp_box(void) { if (is_vsmp != -1) return is_vsmp; else { WARN_ON_ONCE(1); return 0; } } #else static void __init detect_vsmp_box(void) { } int is_vsmp_box(void) { return 0; } #endif void __init vsmp_init(void) { detect_vsmp_box(); if (!is_vsmp_box()) return; set_vsmp_pv_ops(); return; } |