This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / x86_64 / kernel / genapic-xen.c

diff --git a/arch/x86_64/kernel/genapic-xen.c b/arch/x86_64/kernel/genapic-xen.c
new file mode 100644 (file)
index 0000000..1903a5c
--- /dev/null
+++ b/arch/x86_64/kernel/genapic-xen.c
@@ -0,0 +1,144 @@
+/*
+ * Copyright 2004 James Cleverdon, IBM.
+ * Subject to the GNU Public License, v.2
+ *
+ * Generic APIC sub-arch probe layer.
+ *
+ * Hacked for x86-64 by James Cleverdon from i386 architecture code by
+ * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
+ * James Cleverdon.
+ */
+#include <linux/config.h>
+#include <linux/threads.h>
+#include <linux/cpumask.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/ctype.h>
+#include <linux/init.h>
+#include <linux/module.h>
+
+#include <asm/smp.h>
+#include <asm/ipi.h>
+
+#if defined(CONFIG_ACPI)
+#include <acpi/acpi_bus.h>
+#endif
+
+/* which logical CPU number maps to which CPU (physical APIC ID) */
+u8 x86_cpu_to_apicid[NR_CPUS] __read_mostly = { [0 ... NR_CPUS-1] = BAD_APICID };
+EXPORT_SYMBOL(x86_cpu_to_apicid);
+u8 x86_cpu_to_log_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID };
+
+extern struct genapic apic_cluster;
+extern struct genapic apic_flat;
+extern struct genapic apic_physflat;
+
+#ifndef CONFIG_XEN
+struct genapic *genapic = &apic_flat;
+#else
+extern struct genapic apic_xen;
+struct genapic *genapic = &apic_xen;
+#endif
+
+
+/*
+ * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
+ */
+void __init clustered_apic_check(void)
+{
+#ifndef CONFIG_XEN
+       long i;
+       u8 clusters, max_cluster;
+       u8 id;
+       u8 cluster_cnt[NUM_APIC_CLUSTERS];
+       int max_apic = 0;
+
+#if defined(CONFIG_ACPI)
+       /*
+        * Some x86_64 machines use physical APIC mode regardless of how many
+        * procs/clusters are present (x86_64 ES7000 is an example).
+        */
+       if (acpi_fadt.revision > FADT2_REVISION_ID)
+               if (acpi_fadt.force_apic_physical_destination_mode) {
+                       genapic = &apic_cluster;
+                       goto print;
+               }
+#endif
+
+       memset(cluster_cnt, 0, sizeof(cluster_cnt));
+       for (i = 0; i < NR_CPUS; i++) {
+               id = bios_cpu_apicid[i];
+               if (id == BAD_APICID)
+                       continue;
+               if (id > max_apic)
+                       max_apic = id;
+               cluster_cnt[APIC_CLUSTERID(id)]++;
+       }
+
+       /* Don't use clustered mode on AMD platforms. */
+       if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) {
+               genapic = &apic_physflat;
+#ifndef CONFIG_HOTPLUG_CPU
+               /* In the CPU hotplug case we cannot use broadcast mode
+                  because that opens a race when a CPU is removed.
+                  Stay at physflat mode in this case.
+                  It is bad to do this unconditionally though. Once
+                  we have ACPI platform support for CPU hotplug
+                  we should detect hotplug capablity from ACPI tables and
+                  only do this when really needed. -AK */
+               if (max_apic <= 8)
+                       genapic = &apic_flat;
+#endif
+               goto print;
+       }
+
+       clusters = 0;
+       max_cluster = 0;
+
+       for (i = 0; i < NUM_APIC_CLUSTERS; i++) {
+               if (cluster_cnt[i] > 0) {
+                       ++clusters;
+                       if (cluster_cnt[i] > max_cluster)
+                               max_cluster = cluster_cnt[i];
+               }
+       }
+
+       /*
+        * If we have clusters <= 1 and CPUs <= 8 in cluster 0, then flat mode,
+        * else if max_cluster <= 4 and cluster_cnt[15] == 0, clustered logical
+        * else physical mode.
+        * (We don't use lowest priority delivery + HW APIC IRQ steering, so
+        * can ignore the clustered logical case and go straight to physical.)
+        */
+       if (clusters <= 1 && max_cluster <= 8 && cluster_cnt[0] == max_cluster) {
+#ifdef CONFIG_HOTPLUG_CPU
+               /* Don't use APIC shortcuts in CPU hotplug to avoid races */
+               genapic = &apic_physflat;
+#else
+               genapic = &apic_flat;
+#endif
+       } else
+               genapic = &apic_cluster;
+
+print:
+#else
+       /* hardcode to xen apic functions */
+       genapic = &apic_xen;
+#endif
+       printk(KERN_INFO "Setting APIC routing to %s\n", genapic->name);
+}
+
+/* Same for both flat and clustered. */
+
+#ifdef CONFIG_XEN
+extern void xen_send_IPI_shortcut(unsigned int shortcut, int vector, unsigned int dest);
+#endif
+
+void send_IPI_self(int vector)
+{
+#ifndef CONFIG_XEN
+       __send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
+#else
+       xen_send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
+#endif
+}