2 * vSMPowered(tm) systems specific initialization
3 * Copyright (C) 2005 ScaleMP Inc.
5 * Use of this code is subject to the terms and conditions of the
6 * GNU general public license version 2. See "COPYING" or
7 * http://www.gnu.org/licenses/gpl.html
9 * Ravikiran Thirumalai <kiran@scalemp.com>,
10 * Shai Fultheim <shai@scalemp.com>
11 * Paravirt ops integration: Glauber de Oliveira Costa <gcosta@redhat.com>,
12 * Ravikiran Thirumalai <kiran@scalemp.com>
15 #include <linux/init.h>
16 #include <linux/pci_ids.h>
17 #include <linux/pci_regs.h>
18 #include <linux/smp.h>
21 #include <asm/pci-direct.h>
23 #include <asm/paravirt.h>
24 #include <asm/setup.h>
26 #define TOPOLOGY_REGISTER_OFFSET 0x10
28 #if defined CONFIG_PCI && defined CONFIG_PARAVIRT
30 * Interrupt control on vSMPowered systems:
31 * ~AC is a shadow of IF. If IF is 'on' AC should be 'off'
35 static unsigned long vsmp_save_fl(void)
37 unsigned long flags = native_save_fl();
39 if (!(flags & X86_EFLAGS_IF) || (flags & X86_EFLAGS_AC))
40 flags &= ~X86_EFLAGS_IF;
43 PV_CALLEE_SAVE_REGS_THUNK(vsmp_save_fl);
45 static void vsmp_restore_fl(unsigned long flags)
47 if (flags & X86_EFLAGS_IF)
48 flags &= ~X86_EFLAGS_AC;
50 flags |= X86_EFLAGS_AC;
51 native_restore_fl(flags);
53 PV_CALLEE_SAVE_REGS_THUNK(vsmp_restore_fl);
55 static void vsmp_irq_disable(void)
57 unsigned long flags = native_save_fl();
59 native_restore_fl((flags & ~X86_EFLAGS_IF) | X86_EFLAGS_AC);
61 PV_CALLEE_SAVE_REGS_THUNK(vsmp_irq_disable);
63 static void vsmp_irq_enable(void)
65 unsigned long flags = native_save_fl();
67 native_restore_fl((flags | X86_EFLAGS_IF) & (~X86_EFLAGS_AC));
69 PV_CALLEE_SAVE_REGS_THUNK(vsmp_irq_enable);
71 static unsigned __init_or_module vsmp_patch(u8 type, u16 clobbers, void *ibuf,
72 unsigned long addr, unsigned len)
75 case PARAVIRT_PATCH(pv_irq_ops.irq_enable):
76 case PARAVIRT_PATCH(pv_irq_ops.irq_disable):
77 case PARAVIRT_PATCH(pv_irq_ops.save_fl):
78 case PARAVIRT_PATCH(pv_irq_ops.restore_fl):
79 return paravirt_patch_default(type, clobbers, ibuf, addr, len);
81 return native_patch(type, clobbers, ibuf, addr, len);
86 static void __init set_vsmp_pv_ops(void)
88 void __iomem *address;
89 unsigned int cap, ctl, cfg;
91 /* set vSMP magic bits to indicate vSMP capable kernel */
92 cfg = read_pci_config(0, 0x1f, 0, PCI_BASE_ADDRESS_0);
93 address = early_ioremap(cfg, 8);
95 ctl = readl(address + 4);
96 printk(KERN_INFO "vSMP CTL: capabilities:0x%08x control:0x%08x\n",
98 if (cap & ctl & (1 << 4)) {
99 /* Setup irq ops and turn on vSMP IRQ fastpath handling */
100 pv_irq_ops.irq_disable = PV_CALLEE_SAVE(vsmp_irq_disable);
101 pv_irq_ops.irq_enable = PV_CALLEE_SAVE(vsmp_irq_enable);
102 pv_irq_ops.save_fl = PV_CALLEE_SAVE(vsmp_save_fl);
103 pv_irq_ops.restore_fl = PV_CALLEE_SAVE(vsmp_restore_fl);
104 pv_init_ops.patch = vsmp_patch;
107 writel(ctl, address + 4);
108 ctl = readl(address + 4);
109 printk(KERN_INFO "vSMP CTL: control set to:0x%08x\n", ctl);
112 early_iounmap(address, 8);
115 static void __init set_vsmp_pv_ops(void)
121 static int is_vsmp = -1;
123 static void __init detect_vsmp_box(void)
127 if (!early_pci_allowed())
130 /* Check if we are running on a ScaleMP vSMPowered box */
131 if (read_pci_config(0, 0x1f, 0, PCI_VENDOR_ID) ==
132 (PCI_VENDOR_ID_SCALEMP | (PCI_DEVICE_ID_SCALEMP_VSMP_CTL << 16)))
136 int is_vsmp_box(void)
147 static void __init detect_vsmp_box(void)
150 int is_vsmp_box(void)
156 static void __init vsmp_cap_cpus(void)
158 #if !defined(CONFIG_X86_VSMP) && defined(CONFIG_SMP)
159 void __iomem *address;
160 unsigned int cfg, topology, node_shift, maxcpus;
163 * CONFIG_X86_VSMP is not configured, so limit the number CPUs to the
164 * ones present in the first board, unless explicitly overridden by
167 if (setup_max_cpus != NR_CPUS)
170 /* Read the vSMP Foundation topology register */
171 cfg = read_pci_config(0, 0x1f, 0, PCI_BASE_ADDRESS_0);
172 address = early_ioremap(cfg + TOPOLOGY_REGISTER_OFFSET, 4);
173 if (WARN_ON(!address))
176 topology = readl(address);
177 node_shift = (topology >> 16) & 0x7;
179 /* The value 0 should be decoded as 8 */
181 maxcpus = (topology & ((1 << node_shift) - 1)) + 1;
183 pr_info("vSMP CTL: Capping CPUs to %d (CONFIG_X86_VSMP is unset)\n",
185 setup_max_cpus = maxcpus;
186 early_iounmap(address, 4);
190 void __init vsmp_init(void)