[PATCH][2.6.8.1-mm4] Clustered APIC support for x86-64
From: James Cleverdon (jamesclv_at_us.ibm.com)
Date: 09/09/04
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To: linux-kernel@vger.kernel.org, Andi Kleen <ak@suse.de> Date: Wed, 8 Sep 2004 16:47:46 -0700
Forthcoming IBM boxes will be using Nocona and/or Opteron chips in
clustered mode to get beyond 8 CPUs. In fact, there are plans to try
for 128 CPUs when the Tulsa chip comes out. Thus, there are a fair
number of signed vs. unsigned changes in the patch.
Thanks to the HPET timer and some HW changes, I've been able to remove
the MPS/ACPI string comparisons from the detection code. Instead, it
scans bios_cpu_apicid and uses simple heuristics to select the correct
IRQ delivery mode. No need for a config option. Hurrah!
Likewise, I've been able to avoid the preprocessor tricks that the i386
sub-arch needed to build with one or more sub-arches.
This patch has already been run past Andi Kleen and should be coming to
a source tree near you soon.
diff -pruN 2.6.8.1-mm4/arch/i386/kernel/acpi/boot.c z8.1m4/arch/i386/
kernel/acpi/boot.c
--- 2.6.8.1-mm4/arch/i386/kernel/acpi/boot.c 2004-08-25
14:48:19.000000000 -0700
+++ z8.1m4/arch/i386/kernel/acpi/boot.c 2004-08-25 14:49:56.000000000
-0700
@@ -40,7 +40,7 @@
#ifdef CONFIG_X86_64
static inline void acpi_madt_oem_check(char *oem_id, char
*oem_table_id) { }
-static inline void clustered_apic_check(void) { }
+extern void __init clustered_apic_check(void);
static inline int ioapic_setup_disabled(void) { return 0; }
#include <asm/proto.h>
diff -pruN 2.6.8.1-mm4/arch/x86_64/kernel/Makefile z8.1m4/arch/x86_64/
kernel/Makefile
--- 2.6.8.1-mm4/arch/x86_64/kernel/Makefile 2004-08-25
14:48:21.000000000 -0700
+++ z8.1m4/arch/x86_64/kernel/Makefile 2004-08-25 15:00:59.000000000
-0700
@@ -17,7 +17,8 @@ obj-$(CONFIG_MICROCODE) += microcode.o
obj-$(CONFIG_X86_CPUID) += cpuid.o
obj-$(CONFIG_SMP) += smp.o smpboot.o trampoline.o
obj-$(CONFIG_X86_LOCAL_APIC) += apic.o nmi.o
-obj-$(CONFIG_X86_IO_APIC) += io_apic.o mpparse.o
+obj-$(CONFIG_X86_IO_APIC) += io_apic.o mpparse.o \
+ genapic.o genapic_cluster.o genapic_flat.o
obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o
obj-$(CONFIG_PM) += suspend.o
obj-$(CONFIG_SOFTWARE_SUSPEND) += suspend_asm.o
diff -pruN 2.6.8.1-mm4/arch/x86_64/kernel/apic.c z8.1m4/arch/x86_64/
kernel/apic.c
--- 2.6.8.1-mm4/arch/x86_64/kernel/apic.c 2004-08-25 14:48:21.000000000
-0700
+++ z8.1m4/arch/x86_64/kernel/apic.c 2004-08-25 14:49:56.000000000 -0700
@@ -32,6 +32,7 @@
#include <asm/mtrr.h>
#include <asm/mpspec.h>
#include <asm/pgalloc.h>
+#include <asm/mach_apic.h>
int disable_apic_timer __initdata;
@@ -328,8 +329,7 @@ void __init setup_local_APIC (void)
* Double-check whether this APIC is really registered.
* This is meaningless in clustered apic mode, so we skip it.
*/
- if (!clustered_apic_mode &&
- !physid_isset(GET_APIC_ID(apic_read(APIC_ID)), phys_cpu_present_map))
+ if (!apic_id_registered())
BUG();
/*
@@ -337,23 +337,7 @@ void __init setup_local_APIC (void)
* an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel
* document number 292116). So here it goes...
*/
-
- if (!clustered_apic_mode) {
- /*
- * In clustered apic mode, the firmware does this for us
- * Put the APIC into flat delivery mode.
- * Must be "all ones" explicitly for 82489DX.
- */
- apic_write_around(APIC_DFR, 0xffffffff);
-
- /*
- * Set up the logical destination ID.
- */
- value = apic_read(APIC_LDR);
- value &= ~APIC_LDR_MASK;
- value |= (1<<(smp_processor_id()+24));
- apic_write_around(APIC_LDR, value);
- }
+ init_apic_ldr();
/*
* Set Task Priority to 'accept all'. We never change this
diff -pruN 2.6.8.1-mm4/arch/x86_64/kernel/genapic.c z8.1m4/arch/x86_64/
kernel/genapic.c
--- 2.6.8.1-mm4/arch/x86_64/kernel/genapic.c 1969-12-31
16:00:00.000000000 -0800
+++ z8.1m4/arch/x86_64/kernel/genapic.c 2004-08-25 15:17:01.000000000
-0700
@@ -0,0 +1,80 @@
+/*
+ * 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 <asm/smp.h>
+#include <asm/ipi.h>
+
+/* which logical CPU number maps to which CPU (physical APIC ID) */
+u8 x86_cpu_to_apicid[NR_CPUS] = { [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;
+
+struct genapic *genapic;
+
+
+/*
+ * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
+ */
+void __init clustered_apic_check(void)
+{
+ long i;
+ u8 clusters, max_cluster;
+ u8 id;
+ u8 cluster_cnt[NUM_APIC_CLUSTERS];
+
+ memset(cluster_cnt, 0, sizeof(cluster_cnt));
+
+ for (i = 0; i < NR_CPUS; i++) {
+ id = bios_cpu_apicid[i];
+ if (id != BAD_APICID)
+ cluster_cnt[APIC_CLUSTERID(id)]++;
+ }
+
+ 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)
+ genapic = &apic_flat;
+ else
+ genapic = &apic_cluster;
+
+ printk(KERN_INFO "Setting APIC routing to %s\n", genapic->name);
+}
+
+/* Same for both flat and clustered. */
+
+void send_IPI_self(int vector)
+{
+ __send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
+}
diff -pruN 2.6.8.1-mm4/arch/x86_64/kernel/genapic_cluster.c z8.1m4/arch/
x86_64/kernel/genapic_cluster.c
--- 2.6.8.1-mm4/arch/x86_64/kernel/genapic_cluster.c 1969-12-31
16:00:00.000000000 -0800
+++ z8.1m4/arch/x86_64/kernel/genapic_cluster.c 2004-08-25
15:17:07.000000000 -0700
@@ -0,0 +1,146 @@
+/*
+ * Copyright 2004 James Cleverdon, IBM.
+ * Subject to the GNU Public License, v.2
+ *
+ * Clustered APIC subarch code. Up to 255 CPUs, physical delivery.
+ * (A more realistic maximum is around 230 CPUs.)
+ *
+ * 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 <asm/smp.h>
+#include <asm/ipi.h>
+
+
+/*
+ * Set up the logical destination ID.
+ *
+ * Intel recommends to set DFR, LDR and TPR before enabling
+ * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel
+ * document number 292116). So here it goes...
+ */
+static void cluster_init_apic_ldr(void)
+{
+ unsigned long val, id;
+ long i, count;
+ u8 lid;
+ u8 my_id = hard_smp_processor_id();
+ u8 my_cluster = APIC_CLUSTER(my_id);
+
+ /* Create logical APIC IDs by counting CPUs already in cluster. */
+ for (count = 0, i = NR_CPUS; --i >= 0; ) {
+ lid = x86_cpu_to_log_apicid[i];
+ if (lid != BAD_APICID && APIC_CLUSTER(lid) == my_cluster)
+ ++count;
+ }
+ /*
+ * We only have a 4 wide bitmap in cluster mode. There's no way
+ * to get above 60 CPUs and still give each one it's own bit.
+ * But, we're using physical IRQ delivery, so we don't care.
+ * Use bit 3 for the 4th through Nth CPU in each cluster.
+ */
+ if (count >= XAPIC_DEST_CPUS_SHIFT)
+ count = 3;
+ id = my_cluster | (1UL << count);
+ x86_cpu_to_log_apicid[smp_processor_id()] = id;
+ apic_write_around(APIC_DFR, APIC_DFR_CLUSTER);
+ val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
+ val |= SET_APIC_LOGICAL_ID(id);
+ apic_write_around(APIC_LDR, val);
+}
+
+
+/* Mapping from cpu number to logical apicid */
+static int cluster_cpu_to_logical_apicid(int cpu)
+{
+ if ((unsigned)cpu >= NR_CPUS)
+ return BAD_APICID;
+ return x86_cpu_to_log_apicid[cpu];
+}
+
+static int cluster_cpu_present_to_apicid(int mps_cpu)
+{
+ if ((unsigned)mps_cpu < NR_CPUS)
+ return (int)bios_cpu_apicid[mps_cpu];
+ else
+ return BAD_APICID;
+}
+
+/* Distribute IRQ load with round-robin allocation */
+
+static u8 cluster_target_cpus(void)
+{
+ unsigned long i;
+ static unsigned long last_cpu = 0;
+
+ i = last_cpu;
+ do {
+ if (++i >= NR_CPUS)
+ i = 0;
+ } while (x86_cpu_to_apicid[i] == BAD_APICID);
+ last_cpu = i;
+
+ return x86_cpu_to_apicid[i];
+}
+
+static void cluster_send_IPI_mask(cpumask_t mask, int vector)
+{
+ send_IPI_mask_sequence(mask, vector);
+}
+
+static void cluster_send_IPI_allbutself(int vector)
+{
+ cpumask_t mask = cpu_online_map;
+ cpu_clear(smp_processor_id(), mask);
+
+ if (!cpus_empty(mask))
+ cluster_send_IPI_mask(mask, vector);
+}
+
+static void cluster_send_IPI_all(int vector)
+{
+ cluster_send_IPI_mask(cpu_online_map, vector);
+}
+
+static int cluster_apic_id_registered(void)
+{
+ return 1;
+}
+
+static unsigned int cluster_cpu_mask_to_apicid(cpumask_t cpumask)
+{
+ long cpu;
+
+ /*
+ * We're using fixed IRQ delivery, can only return one phys APIC ID.
+ * May as well be the first.
+ */
+ cpu = first_cpu(cpumask);
+ if (cpu >= 0 && cpu < NR_CPUS)
+ return x86_cpu_to_apicid[cpu];
+ else
+ return BAD_APICID;
+}
+
+
+struct genapic apic_cluster = {
+ .name = "clustered",
+ .int_delivery_mode = dest_Fixed,
+ .int_dest_mode = (APIC_DEST_PHYSICAL != 0),
+ .int_delivery_dest = APIC_DEST_PHYSICAL | APIC_DM_FIXED,
+ .target_cpus = cluster_target_cpus,
+ .apic_id_registered = cluster_apic_id_registered,
+ .init_apic_ldr = cluster_init_apic_ldr,
+ .send_IPI_all = cluster_send_IPI_all,
+ .send_IPI_allbutself = cluster_send_IPI_allbutself,
+ .send_IPI_mask = cluster_send_IPI_mask,
+ .cpu_mask_to_apicid = cluster_cpu_mask_to_apicid,
+};
diff -pruN 2.6.8.1-mm4/arch/x86_64/kernel/genapic_flat.c z8.1m4/arch/
x86_64/kernel/genapic_flat.c
--- 2.6.8.1-mm4/arch/x86_64/kernel/genapic_flat.c 1969-12-31
16:00:00.000000000 -0800
+++ z8.1m4/arch/x86_64/kernel/genapic_flat.c 2004-08-25
15:17:11.000000000 -0700
@@ -0,0 +1,119 @@
+/*
+ * Copyright 2004 James Cleverdon, IBM.
+ * Subject to the GNU Public License, v.2
+ *
+ * Flat APIC subarch code. Maximum 8 CPUs, logical delivery.
+ *
+ * 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 <asm/smp.h>
+#include <asm/ipi.h>
+
+
+static u8 flat_target_cpus(void)
+{
+ return cpus_addr(cpu_online_map)[0];
+}
+
+/*
+ * Set up the logical destination ID.
+ *
+ * Intel recommends to set DFR, LDR and TPR before enabling
+ * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel
+ * document number 292116). So here it goes...
+ */
+static void flat_init_apic_ldr(void)
+{
+ unsigned long val;
+ unsigned long num, id;
+
+ num = smp_processor_id();
+ id = 1UL << num;
+ x86_cpu_to_log_apicid[num] = id;
+ apic_write_around(APIC_DFR, APIC_DFR_FLAT);
+ val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
+ val |= SET_APIC_LOGICAL_ID(id);
+ apic_write_around(APIC_LDR, val);
+}
+
+static void flat_send_IPI_allbutself(int vector)
+{
+ /*
+ * if there are no other CPUs in the system then
+ * we get an APIC send error if we try to broadcast.
+ * thus we have to avoid sending IPIs in this case.
+ */
+ if (num_online_cpus() > 1)
+ __send_IPI_shortcut(APIC_DEST_ALLBUT, vector, APIC_DEST_LOGICAL);
+}
+
+static void flat_send_IPI_all(int vector)
+{
+ __send_IPI_shortcut(APIC_DEST_ALLINC, vector, APIC_DEST_LOGICAL);
+}
+
+static void flat_send_IPI_mask(cpumask_t cpumask, int vector)
+{
+ unsigned long mask = cpus_addr(cpumask)[0];
+ unsigned long cfg;
+ unsigned long flags;
+
+ local_save_flags(flags);
+ local_irq_disable();
+
+ /*
+ * Wait for idle.
+ */
+ apic_wait_icr_idle();
+
+ /*
+ * prepare target chip field
+ */
+ cfg = __prepare_ICR2(mask);
+ apic_write_around(APIC_ICR2, cfg);
+
+ /*
+ * program the ICR
+ */
+ cfg = __prepare_ICR(0, vector, APIC_DEST_LOGICAL);
+
+ /*
+ * Send the IPI. The write to APIC_ICR fires this off.
+ */
+ apic_write_around(APIC_ICR, cfg);
+ local_irq_restore(flags);
+}
+
+static int flat_apic_id_registered(void)
+{
+ return physid_isset(GET_APIC_ID(apic_read(APIC_ID)),
phys_cpu_present_map);
+}
+
+static unsigned int flat_cpu_mask_to_apicid(cpumask_t cpumask)
+{
+ return cpus_addr(cpumask)[0] & APIC_ALL_CPUS;
+}
+
+
+struct genapic apic_flat = {
+ .name = "flat",
+ .int_delivery_mode = dest_LowestPrio,
+ .int_dest_mode = (APIC_DEST_LOGICAL != 0),
+ .int_delivery_dest = APIC_DEST_LOGICAL | APIC_DM_LOWEST,
+ .target_cpus = flat_target_cpus,
+ .apic_id_registered = flat_apic_id_registered,
+ .init_apic_ldr = flat_init_apic_ldr,
+ .send_IPI_all = flat_send_IPI_all,
+ .send_IPI_allbutself = flat_send_IPI_allbutself,
+ .send_IPI_mask = flat_send_IPI_mask,
+ .cpu_mask_to_apicid = flat_cpu_mask_to_apicid,
+};
diff -pruN 2.6.8.1-mm4/arch/x86_64/kernel/io_apic.c z8.1m4/arch/x86_64/
kernel/io_apic.c
--- 2.6.8.1-mm4/arch/x86_64/kernel/io_apic.c 2004-08-25
14:48:21.000000000 -0700
+++ z8.1m4/arch/x86_64/kernel/io_apic.c 2004-08-25 14:49:56.000000000
-0700
@@ -35,6 +35,7 @@
#include <asm/smp.h>
#include <asm/desc.h>
#include <asm/proto.h>
+#include <asm/mach_apic.h>
int sis_apic_bug; /* not actually supported, dummy for compile */
@@ -729,8 +730,8 @@ void __init setup_IO_APIC_irqs(void)
*/
memset(&entry,0,sizeof(entry));
- entry.delivery_mode = dest_LowestPrio;
- entry.dest_mode = INT_DELIVERY_MODE;
+ entry.delivery_mode = INT_DELIVERY_MODE;
+ entry.dest_mode = INT_DEST_MODE;
entry.mask = 0; /* enable IRQ */
entry.dest.logical.logical_dest = TARGET_CPUS;
@@ -798,10 +799,10 @@ void __init setup_ExtINT_IRQ0_pin(unsign
* We use logical delivery to get the timer IRQ
* to the first CPU.
*/
- entry.dest_mode = INT_DELIVERY_MODE;
+ entry.dest_mode = INT_DEST_MODE;
entry.mask = 0; /* unmask IRQ now */
entry.dest.logical.logical_dest = TARGET_CPUS;
- entry.delivery_mode = dest_LowestPrio;
+ entry.delivery_mode = INT_DELIVERY_MODE;
entry.polarity = 0;
entry.trigger = 0;
entry.vector = vector;
@@ -1173,7 +1174,6 @@ void disable_IO_APIC(void)
static void __init setup_ioapic_ids_from_mpc (void)
{
union IO_APIC_reg_00 reg_00;
- physid_mask_t phys_id_present_map = phys_cpu_present_map;
int apic;
int i;
unsigned char old_id;
@@ -1199,28 +1199,7 @@ static void __init setup_ioapic_ids_from
mp_ioapics[apic].mpc_apicid = reg_00.bits.ID;
}
- /*
- * Sanity check, is the ID really free? Every APIC in a
- * system must have a unique ID or we get lots of nice
- * 'stuck on smp_invalidate_needed IPI wait' messages.
- */
- if (physid_isset(mp_ioapics[apic].mpc_apicid, phys_id_present_map)) {
- printk(KERN_ERR "BIOS bug, IO-APIC#%d ID %d is already used!...\n",
- apic, mp_ioapics[apic].mpc_apicid);
- for (i = 0; i < 0xf; i++)
- if (!physid_isset(i, phys_id_present_map))
- break;
- if (i >= 0xf)
- panic("Max APIC ID exceeded!\n");
- printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
- i);
- physid_set(i, phys_id_present_map);
- mp_ioapics[apic].mpc_apicid = i;
- } else {
- printk(KERN_INFO
- "Using IO-APIC %d\n", mp_ioapics[apic].mpc_apicid);
- physid_set(mp_ioapics[apic].mpc_apicid, phys_id_present_map);
- }
+ printk(KERN_INFO "Using IO-APIC %d\n", mp_ioapics[apic].mpc_apicid);
/*
@@ -1429,9 +1408,9 @@ static void set_ioapic_affinity_irq(unsi
dest = cpu_mask_to_apicid(mask);
/*
- * Only the first 8 bits are valid.
+ * Only the high 8 bits are valid.
*/
- dest = dest << 24;
+ dest = SET_APIC_LOGICAL_ID(dest);
spin_lock_irqsave(&ioapic_lock, flags);
__DO_ACTION(1, = dest, )
@@ -1821,7 +1800,7 @@ void __init setup_IO_APIC(void)
#ifdef CONFIG_ACPI_BOOT
-#define IO_APIC_MAX_ID 15
+#define IO_APIC_MAX_ID 0xFE
int __init io_apic_get_unique_id (int ioapic, int apic_id)
{
@@ -1938,8 +1917,8 @@ int io_apic_set_pci_routing (int ioapic,
memset(&entry,0,sizeof(entry));
- entry.delivery_mode = dest_LowestPrio;
- entry.dest_mode = INT_DELIVERY_MODE;
+ entry.delivery_mode = INT_DELIVERY_MODE;
+ entry.dest_mode = INT_DEST_MODE;
entry.dest.logical.logical_dest = TARGET_CPUS;
entry.trigger = edge_level;
entry.polarity = active_high_low;
@@ -1981,20 +1960,3 @@ int io_apic_set_pci_routing (int ioapic,
#endif /*CONFIG_ACPI_BOOT*/
-#ifndef CONFIG_SMP
-void send_IPI_self(int vector)
-{
- unsigned int cfg;
-
- /*
- * Wait for idle.
- */
- apic_wait_icr_idle();
- cfg = APIC_DM_FIXED | APIC_DEST_SELF | vector | APIC_DEST_LOGICAL;
-
- /*
- * Send the IPI. The write to APIC_ICR fires this off.
- */
- apic_write_around(APIC_ICR, cfg);
-}
-#endif
diff -pruN 2.6.8.1-mm4/arch/x86_64/kernel/smp.c z8.1m4/arch/x86_64/
kernel/smp.c
--- 2.6.8.1-mm4/arch/x86_64/kernel/smp.c 2004-08-25 14:48:21.000000000
-0700
+++ z8.1m4/arch/x86_64/kernel/smp.c 2004-08-25 14:49:56.000000000 -0700
@@ -24,105 +24,7 @@
#include <asm/mtrr.h>
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
-
-/*
- * the following functions deal with sending IPIs between CPUs.
- *
- * We use 'broadcast', CPU->CPU IPIs and self-IPIs too.
- */
-
-static inline unsigned int __prepare_ICR (unsigned int shortcut, int
vector)
-{
- unsigned int icr = APIC_DM_FIXED | shortcut | vector |
APIC_DEST_LOGICAL;
- if (vector == KDB_VECTOR)
- icr = (icr & (~APIC_VECTOR_MASK)) | APIC_DM_NMI;
- return icr;
-}
-
-static inline int __prepare_ICR2 (unsigned int mask)
-{
- return SET_APIC_DEST_FIELD(mask);
-}
-
-static inline void __send_IPI_shortcut(unsigned int shortcut, int
vector)
-{
- /*
- * Subtle. In the case of the 'never do double writes' workaround
- * we have to lock out interrupts to be safe. As we don't care
- * of the value read we use an atomic rmw access to avoid costly
- * cli/sti. Otherwise we use an even cheaper single atomic write
- * to the APIC.
- */
- unsigned int cfg;
-
- /*
- * Wait for idle.
- */
- apic_wait_icr_idle();
-
- /*
- * No need to touch the target chip field
- */
- cfg = __prepare_ICR(shortcut, vector);
-
- /*
- * Send the IPI. The write to APIC_ICR fires this off.
- */
- apic_write_around(APIC_ICR, cfg);
-}
-
-static inline void send_IPI_allbutself(int vector)
-{
- /*
- * if there are no other CPUs in the system then
- * we get an APIC send error if we try to broadcast.
- * thus we have to avoid sending IPIs in this case.
- */
- if (num_online_cpus() > 1)
- __send_IPI_shortcut(APIC_DEST_ALLBUT, vector);
-}
-
-static inline void send_IPI_all(int vector)
-{
- __send_IPI_shortcut(APIC_DEST_ALLINC, vector);
-}
-
-void send_IPI_self(int vector)
-{
- __send_IPI_shortcut(APIC_DEST_SELF, vector);
-}
-
-static inline void send_IPI_mask(cpumask_t cpumask, int vector)
-{
- unsigned long mask = cpus_addr(cpumask)[0];
- unsigned long cfg;
- unsigned long flags;
-
- local_save_flags(flags);
- local_irq_disable();
-
- /*
- * Wait for idle.
- */
- apic_wait_icr_idle();
-
- /*
- * prepare target chip field
- */
- cfg = __prepare_ICR2(mask);
- apic_write_around(APIC_ICR2, cfg);
-
- /*
- * program the ICR
- */
- cfg = __prepare_ICR(0, vector);
-
- /*
- * Send the IPI. The write to APIC_ICR fires this off.
- */
- apic_write_around(APIC_ICR, cfg);
- local_irq_restore(flags);
-}
+#include <asm/mach_apic.h>
/*
* Smarter SMP flushing macros.
diff -pruN 2.6.8.1-mm4/arch/x86_64/kernel/smpboot.c z8.1m4/arch/x86_64/
kernel/smpboot.c
--- 2.6.8.1-mm4/arch/x86_64/kernel/smpboot.c 2004-08-25
14:48:21.000000000 -0700
+++ z8.1m4/arch/x86_64/kernel/smpboot.c 2004-08-25 14:58:01.000000000
-0700
@@ -56,15 +56,12 @@
/* Number of siblings per CPU package */
int smp_num_siblings = 1;
-char phys_proc_id[NR_CPUS]; /* Package ID of each logical CPU */
+/* Package ID of each logical CPU */
+u8 phys_proc_id[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID };
/* Bitmask of currently online CPUs */
cpumask_t cpu_online_map;
-/* which logical CPU number maps to which CPU (physical APIC ID) */
-volatile char x86_cpu_to_apicid[NR_CPUS];
-EXPORT_SYMBOL(x86_cpu_to_apicid);
-
static cpumask_t cpu_callin_map;
cpumask_t cpu_callout_map;
static cpumask_t smp_commenced_mask;
@@ -658,6 +655,8 @@ static void __init do_boot_cpu (int apic
cpu_clear(cpu, cpu_callout_map); /* was set here (do_boot_cpu()) */
clear_bit(cpu, &cpu_initialized); /* was set by cpu_init() */
cpucount--;
+ x86_cpu_to_apicid[cpu] = BAD_APICID;
+ x86_cpu_to_log_apicid[cpu] = BAD_APICID;
}
}
diff -pruN 2.6.8.1-mm4/include/asm-x86_64/apic.h z8.1m4/include/
asm-x86_64/apic.h
--- 2.6.8.1-mm4/include/asm-x86_64/apic.h 2004-08-14 03:56:01.000000000
-0700
+++ z8.1m4/include/asm-x86_64/apic.h 2004-08-25 14:49:56.000000000 -0700
@@ -97,7 +97,6 @@ extern unsigned int nmi_watchdog;
#endif /* CONFIG_X86_LOCAL_APIC */
-#define clustered_apic_mode 0
#define esr_disable 0
extern unsigned boot_cpu_id;
diff -pruN 2.6.8.1-mm4/include/asm-x86_64/apicdef.h z8.1m4/include/
asm-x86_64/apicdef.h
--- 2.6.8.1-mm4/include/asm-x86_64/apicdef.h 2004-08-25
14:48:28.000000000 -0700
+++ z8.1m4/include/asm-x86_64/apicdef.h 2004-08-25 14:52:52.000000000
-0700
@@ -11,26 +11,26 @@
#define APIC_DEFAULT_PHYS_BASE 0xfee00000
#define APIC_ID 0x20
-#define APIC_ID_MASK (0x0F<<24)
-#define GET_APIC_ID(x) (((x)>>24)&0x0F)
+#define APIC_ID_MASK (0xFFu<<24)
+#define GET_APIC_ID(x) (((x)>>24)&0xFFu)
#define APIC_LVR 0x30
#define APIC_LVR_MASK 0xFF00FF
-#define GET_APIC_VERSION(x) ((x)&0xFF)
-#define GET_APIC_MAXLVT(x) (((x)>>16)&0xFF)
-#define APIC_INTEGRATED(x) ((x)&0xF0)
+#define GET_APIC_VERSION(x) ((x)&0xFFu)
+#define GET_APIC_MAXLVT(x) (((x)>>16)&0xFFu)
+#define APIC_INTEGRATED(x) ((x)&0xF0u)
#define APIC_TASKPRI 0x80
-#define APIC_TPRI_MASK 0xFF
+#define APIC_TPRI_MASK 0xFFu
#define APIC_ARBPRI 0x90
-#define APIC_ARBPRI_MASK 0xFF
+#define APIC_ARBPRI_MASK 0xFFu
#define APIC_PROCPRI 0xA0
#define APIC_EOI 0xB0
#define APIC_EIO_ACK 0x0 /* Write this to the EOI register */
#define APIC_RRR 0xC0
#define APIC_LDR 0xD0
-#define APIC_LDR_MASK (0xFF<<24)
-#define GET_APIC_LOGICAL_ID(x) (((x)>>24)&0xFF)
+#define APIC_LDR_MASK (0xFFu<<24)
+#define GET_APIC_LOGICAL_ID(x) (((x)>>24)&0xFFu)
#define SET_APIC_LOGICAL_ID(x) (((x)<<24))
-#define APIC_ALL_CPUS 0xFF
+#define APIC_ALL_CPUS 0xFFu
#define APIC_DFR 0xE0
#define APIC_DFR_CLUSTER 0x0FFFFFFFul
#define APIC_DFR_FLAT 0xFFFFFFFFul
@@ -60,6 +60,7 @@
#define APIC_INT_ASSERT 0x04000
#define APIC_ICR_BUSY 0x01000
#define APIC_DEST_LOGICAL 0x00800
+#define APIC_DEST_PHYSICAL 0x00000
#define APIC_DM_FIXED 0x00000
#define APIC_DM_LOWEST 0x00100
#define APIC_DM_SMI 0x00200
@@ -114,6 +115,18 @@
#define MAX_IO_APICS 16
/*
+ * All x86-64 systems are xAPIC compatible.
+ * In the following, "apicid" is a physical APIC ID.
+ */
+#define XAPIC_DEST_CPUS_SHIFT 4
+#define XAPIC_DEST_CPUS_MASK ((1u << XAPIC_DEST_CPUS_SHIFT) - 1)
+#define XAPIC_DEST_CLUSTER_MASK (XAPIC_DEST_CPUS_MASK <<
XAPIC_DEST_CPUS_SHIFT)
+#define APIC_CLUSTER(apicid) ((apicid) & XAPIC_DEST_CLUSTER_MASK)
+#define APIC_CLUSTERID(apicid) (APIC_CLUSTER(apicid) >>
XAPIC_DEST_CPUS_SHIFT)
+#define APIC_CPUID(apicid) ((apicid) & XAPIC_DEST_CPUS_MASK)
+#define NUM_APIC_CLUSTERS ((BAD_APICID + 1) >> XAPIC_DEST_CPUS_SHIFT)
+
+/*
* the local APIC register structure, memory mapped. Not terribly well
* tested, but we might eventually use this one in the future - the
* problem why we cannot use it right now is the P5 APIC, it has an
diff -pruN 2.6.8.1-mm4/include/asm-x86_64/genapic.h z8.1m4/include/
asm-x86_64/genapic.h
--- 2.6.8.1-mm4/include/asm-x86_64/genapic.h 1969-12-31
16:00:00.000000000 -0800
+++ z8.1m4/include/asm-x86_64/genapic.h 2004-08-25 15:17:20.000000000
-0700
@@ -0,0 +1,34 @@
+#ifndef _ASM_GENAPIC_H
+#define _ASM_GENAPIC_H 1
+
+/*
+ * Copyright 2004 James Cleverdon, IBM.
+ * Subject to the GNU Public License, v.2
+ *
+ * Generic APIC sub-arch data struct.
+ *
+ * Hacked for x86-64 by James Cleverdon from i386 architecture code by
+ * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
+ * James Cleverdon.
+ */
+
+struct genapic {
+ char *name;
+ u32 int_delivery_mode;
+ u32 int_dest_mode;
+ u32 int_delivery_dest; /* for quick IPIs */
+ int (*apic_id_registered)(void);
+ u8 (*target_cpus)(void);
+ void (*init_apic_ldr)(void);
+ /* ipi */
+ void (*send_IPI_mask)(cpumask_t mask, int vector);
+ void (*send_IPI_allbutself)(int vector);
+ void (*send_IPI_all)(int vector);
+ /* */
+ unsigned int (*cpu_mask_to_apicid)(cpumask_t cpumask);
+};
+
+
+extern struct genapic *genapic;
+
+#endif
diff -pruN 2.6.8.1-mm4/include/asm-x86_64/ipi.h z8.1m4/include/
asm-x86_64/ipi.h
--- 2.6.8.1-mm4/include/asm-x86_64/ipi.h 1969-12-31 16:00:00.000000000
-0800
+++ z8.1m4/include/asm-x86_64/ipi.h 2004-08-25 15:19:44.000000000 -0700
@@ -0,0 +1,113 @@
+#ifndef __ASM_IPI_H
+#define __ASM_IPI_H
+
+/*
+ * Copyright 2004 James Cleverdon, IBM.
+ * Subject to the GNU Public License, v.2
+ *
+ * Generic APIC InterProcessor Interrupt code.
+ *
+ * Moved to include file by James Cleverdon from
+ * arch/x86-64/kernel/smp.c
+ *
+ * Copyrights from kernel/smp.c:
+ *
+ * (c) 1995 Alan Cox, Building #3 <alan@redhat.com>
+ * (c) 1998-99, 2000 Ingo Molnar <mingo@redhat.com>
+ * (c) 2002,2003 Andi Kleen, SuSE Labs.
+ * Subject to the GNU Public License, v.2
+ */
+
+#include <asm/fixmap.h>
+#include <asm/hw_irq.h>
+#include <asm/apicdef.h>
+#include <asm/genapic.h>
+
+/*
+ * the following functions deal with sending IPIs between CPUs.
+ *
+ * We use 'broadcast', CPU->CPU IPIs and self-IPIs too.
+ */
+
+static inline unsigned int __prepare_ICR (unsigned int shortcut, int
vector, unsigned int dest)
+{
+ unsigned int icr = APIC_DM_FIXED | shortcut | vector | dest;
+ if (vector == KDB_VECTOR)
+ icr = (icr & (~APIC_VECTOR_MASK)) | APIC_DM_NMI;
+ return icr;
+}
+
+static inline int __prepare_ICR2 (unsigned int mask)
+{
+ return SET_APIC_DEST_FIELD(mask);
+}
+
+static inline void __send_IPI_shortcut(unsigned int shortcut, int
vector, unsigned int dest)
+{
+ /*
+ * Subtle. In the case of the 'never do double writes' workaround
+ * we have to lock out interrupts to be safe. As we don't care
+ * of the value read we use an atomic rmw access to avoid costly
+ * cli/sti. Otherwise we use an even cheaper single atomic write
+ * to the APIC.
+ */
+ unsigned int cfg;
+
+ /*
+ * Wait for idle.
+ */
+ apic_wait_icr_idle();
+
+ /*
+ * No need to touch the target chip field
+ */
+ cfg = __prepare_ICR(shortcut, vector, dest);
+
+ /*
+ * Send the IPI. The write to APIC_ICR fires this off.
+ */
+ apic_write_around(APIC_ICR, cfg);
+}
+
+
+static inline void send_IPI_mask_sequence(cpumask_t mask, int vector)
+{
+ unsigned long cfg, flags;
+ unsigned long query_cpu;
+
+ /*
+ * Hack. The clustered APIC addressing mode doesn't allow us to send
+ * to an arbitrary mask, so I do a unicast to each CPU instead.
+ * - mbligh
+ */
+ local_irq_save(flags);
+
+ for (query_cpu = 0; query_cpu < NR_CPUS; ++query_cpu) {
+ if (cpu_isset(query_cpu, mask)) {
+
+ /*
+ * Wait for idle.
+ */
+ apic_wait_icr_idle();
+
+ /*
+ * prepare target chip field
+ */
+ cfg = __prepare_ICR2(x86_cpu_to_apicid[query_cpu]);
+ apic_write_around(APIC_ICR2, cfg);
+
+ /*
+ * program the ICR
+ */
+ cfg = __prepare_ICR(0, vector, APIC_DEST_PHYSICAL);
+
+ /*
+ * Send the IPI. The write to APIC_ICR fires this off.
+ */
+ apic_write_around(APIC_ICR, cfg);
+ }
+ }
+ local_irq_restore(flags);
+}
+
+#endif /* __ASM_IPI_H */
diff -pruN 2.6.8.1-mm4/include/asm-x86_64/irq.h z8.1m4/include/
asm-x86_64/irq.h
--- 2.6.8.1-mm4/include/asm-x86_64/irq.h 2004-08-25 14:48:28.000000000
-0700
+++ z8.1m4/include/asm-x86_64/irq.h 2004-08-25 14:49:56.000000000 -0700
@@ -36,7 +36,7 @@
#define NR_IRQ_VECTORS NR_IRQS
#else
#define NR_IRQS 224
-#define NR_IRQ_VECTORS NR_IRQS
+#define NR_IRQ_VECTORS 1024
#endif
static __inline__ int irq_canonicalize(int irq)
diff -pruN 2.6.8.1-mm4/include/asm-x86_64/mach_apic.h z8.1m4/include/
asm-x86_64/mach_apic.h
--- 2.6.8.1-mm4/include/asm-x86_64/mach_apic.h 1969-12-31
16:00:00.000000000 -0800
+++ z8.1m4/include/asm-x86_64/mach_apic.h 2004-08-25 15:17:38.000000000
-0700
@@ -0,0 +1,28 @@
+#ifndef __ASM_MACH_APIC_H
+#define __ASM_MACH_APIC_H
+
+/*
+ * Copyright 2004 James Cleverdon, IBM.
+ * Subject to the GNU Public License, v.2
+ *
+ * Generic APIC sub-arch defines.
+ *
+ * Hacked for x86-64 by James Cleverdon from i386 architecture code by
+ * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
+ * James Cleverdon.
+ */
+
+#include <asm/genapic.h>
+
+#define INT_DELIVERY_MODE (genapic->int_delivery_mode)
+#define INT_DEST_MODE (genapic->int_dest_mode)
+#define INT_DELIVERY_DEST (genapic->int_delivery_dest)
+#define TARGET_CPUS (genapic->target_cpus())
+#define apic_id_registered (genapic->apic_id_registered)
+#define init_apic_ldr (genapic->init_apic_ldr)
+#define send_IPI_mask (genapic->send_IPI_mask)
+#define send_IPI_allbutself (genapic->send_IPI_allbutself)
+#define send_IPI_all (genapic->send_IPI_all)
+#define cpu_mask_to_apicid (genapic->cpu_mask_to_apicid)
+
+#endif /* __ASM_MACH_APIC_H */
diff -pruN 2.6.8.1-mm4/include/asm-x86_64/mpspec.h z8.1m4/include/
asm-x86_64/mpspec.h
--- 2.6.8.1-mm4/include/asm-x86_64/mpspec.h 2004-08-25
14:48:28.000000000 -0700
+++ z8.1m4/include/asm-x86_64/mpspec.h 2004-08-25 14:49:56.000000000
-0700
@@ -14,9 +14,9 @@
#define SMP_MAGIC_IDENT (('_'<<24)|('P'<<16)|('M'<<8)|'_')
/*
- * a maximum of 16 APICs with the current APIC ID architecture.
+ * A maximum of 255 APICs with the current APIC ID architecture.
*/
-#define MAX_APICS 16
+#define MAX_APICS 128
struct intel_mp_floating
{
@@ -157,7 +157,11 @@ struct mpc_config_lintsrc
*/
#define MAX_IRQ_SOURCES 256
-#define MAX_MP_BUSSES 32
+/*
+ * Assume max PCI and 8 chassis x366 system (with 8 ISA): 256 + 8 =
264.
+ * Call it 270 for safety.
+ */
+#define MAX_MP_BUSSES 270
enum mp_bustype {
MP_BUS_ISA = 1,
MP_BUS_EISA,
diff -pruN 2.6.8.1-mm4/include/asm-x86_64/msi.h z8.1m4/include/
asm-x86_64/msi.h
--- 2.6.8.1-mm4/include/asm-x86_64/msi.h 2004-08-14 03:56:00.000000000
-0700
+++ z8.1m4/include/asm-x86_64/msi.h 2004-08-25 14:49:56.000000000 -0700
@@ -7,6 +7,7 @@
#define ASM_MSI_H
#include <asm/desc.h>
+#include <asm/mach_apic.h>
#define LAST_DEVICE_VECTOR 232
#define MSI_DEST_MODE MSI_LOGICAL_MODE
diff -pruN 2.6.8.1-mm4/include/asm-x86_64/smp.h z8.1m4/include/
asm-x86_64/smp.h
--- 2.6.8.1-mm4/include/asm-x86_64/smp.h 2004-08-14 03:54:46.000000000
-0700
+++ z8.1m4/include/asm-x86_64/smp.h 2004-08-25 14:49:56.000000000 -0700
@@ -48,7 +48,7 @@ extern void (*mtrr_hook) (void);
extern void zap_low_mappings(void);
void smp_stop_cpu(void);
extern cpumask_t cpu_sibling_map[NR_CPUS];
-extern char phys_proc_id[NR_CPUS];
+extern u8 phys_proc_id[NR_CPUS];
#define SMP_TRAMPOLINE_BASE 0x6000
@@ -74,14 +74,29 @@ extern __inline int hard_smp_processor_i
return GET_APIC_ID(*(unsigned int *)(APIC_BASE+APIC_ID));
}
+#define safe_smp_processor_id() (disable_apic ? 0 :
x86_apicid_to_cpu(hard_smp_processor_id()))
+
+#endif /* !ASSEMBLY */
+
+#define NO_PROC_ID 0xFF /* No processor magic marker */
+
+#endif
+
+#ifndef ASSEMBLY
/*
* Some lowlevel functions might want to know about
* the real APIC ID <-> CPU # mapping.
- * AK: why is this volatile?
*/
-extern volatile char x86_cpu_to_apicid[NR_CPUS];
+extern u8 x86_cpu_to_apicid[NR_CPUS]; /* physical ID */
+extern u8 x86_cpu_to_log_apicid[NR_CPUS];
+extern u8 bios_cpu_apicid[];
+
+static inline unsigned int cpu_mask_to_apicid(cpumask_t cpumask)
+{
+ return cpus_addr(cpumask)[0];
+}
-static inline char x86_apicid_to_cpu(char apicid)
+static inline int x86_apicid_to_cpu(u8 apicid)
{
int i;
@@ -92,10 +107,6 @@ static inline char x86_apicid_to_cpu(cha
return -1;
}
-#define safe_smp_processor_id() (disable_apic ? 0 :
x86_apicid_to_cpu(hard_smp_processor_id()))
-
-extern u8 bios_cpu_apicid[];
-
static inline int cpu_present_to_apicid(int mps_cpu)
{
if (mps_cpu < NR_CPUS)
@@ -103,20 +114,6 @@ static inline int cpu_present_to_apicid(
else
return BAD_APICID;
}
-
-#endif /* !ASSEMBLY */
-
-#define NO_PROC_ID 0xFF /* No processor magic marker */
-
-#endif
-#define INT_DELIVERY_MODE 1 /* logical delivery */
-#define TARGET_CPUS 1
-
-#ifndef ASSEMBLY
-static inline unsigned int cpu_mask_to_apicid(cpumask_t cpumask)
-{
- return cpus_addr(cpumask)[0];
-}
#endif
#ifndef CONFIG_SMP
--
James Cleverdon
IBM LTC (xSeries Linux Solutions)
{jamesclv(Unix, preferred), cleverdj(Notes)} at us dot ibm dot comm
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