x86: fix build breakage when PCI is define and PARAVIRT is not

[sfrench/cifs-2.6.git] / arch / x86 / kernel / vsmp_64.c

diff --git a/arch/x86/kernel/vsmp_64.c b/arch/x86/kernel/vsmp_64.c
index fdf9fba6ba9c1a4455805c4501d9bce5d4746217..4a790a5f61b71135b958335c778c00397a929ada 100644 (file)
--- a/arch/x86/kernel/vsmp_64.c
+++ b/arch/x86/kernel/vsmp_64.c
@@ -8,6 +8,8 @@
  *
  * 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>
@@ -15,21 +17,72 @@
 #include <linux/pci_regs.h>
 #include <asm/pci-direct.h>
 #include <asm/io.h>
+#include <asm/paravirt.h>
 
-void __init vsmp_init(void)
+#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 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;
 
-       if (!early_pci_allowed())
-               return;
-
-       /* Check if we are running on a ScaleMP vSMP box */
-       if ((read_pci_config_16(0, 0x1f, 0, PCI_VENDOR_ID) !=
-            PCI_VENDOR_ID_SCALEMP) ||
-           (read_pci_config_16(0, 0x1f, 0, PCI_DEVICE_ID) !=
-            PCI_DEVICE_ID_SCALEMP_VSMP_CTL))
-               return;
+       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;
 
        /* set vSMP magic bits to indicate vSMP capable kernel */
        cfg = read_pci_config(0, 0x1f, 0, PCI_BASE_ADDRESS_0);
@@ -47,5 +100,46 @@ void __init vsmp_init(void)
        }
 
        early_iounmap(address, 8);
+}
+#else
+static void __init set_vsmp_pv_ops(void)
+{
+}
+#endif
+
+#ifdef CONFIG_PCI
+static int vsmp = -1;
+
+int is_vsmp_box(void)
+{
+       if (vsmp != -1)
+               return vsmp;
+
+       vsmp = 0;
+       if (!early_pci_allowed())
+               return vsmp;
+
+       /* Check if we are running on a ScaleMP vSMP box */
+       if ((read_pci_config_16(0, 0x1f, 0, PCI_VENDOR_ID) ==
+            PCI_VENDOR_ID_SCALEMP) &&
+           (read_pci_config_16(0, 0x1f, 0, PCI_DEVICE_ID) ==
+           PCI_DEVICE_ID_SCALEMP_VSMP_CTL))
+               vsmp = 1;
+
+       return vsmp;
+}
+#else
+int is_vsmp_box(void)
+{
+       return 0;
+}
+#endif
+
+void __init vsmp_init(void)
+{
+       if (!is_vsmp_box())
+               return;
+
+       set_vsmp_pv_ops();
        return;
 }