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Date: Sun, 24 Aug 2008 02:01:49 -0700
From: Yinghai Lu <yhlu.kernel@...il.com>
To: Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, Yinghai Lu <yhlu.kernel@...il.com>
Subject: [PATCH 11/18] x86: make apic_32/64.c more like
except x2apic, detec_init_APIC, and calibrating_APIC_clock
Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
---
arch/x86/kernel/apic_32.c | 125 ++++++++++++++++++++++++++++++++++++++++----
arch/x86/kernel/apic_64.c | 10 +++-
2 files changed, 122 insertions(+), 13 deletions(-)
diff --git a/arch/x86/kernel/apic_32.c b/arch/x86/kernel/apic_32.c
index 6fb2b45..294256f 100644
--- a/arch/x86/kernel/apic_32.c
+++ b/arch/x86/kernel/apic_32.c
@@ -66,6 +66,9 @@ static int __init parse_lapic(char *arg)
return 0;
}
early_param("lapic", parse_lapic);
+/* Local APIC was disabled by the BIOS and enabled by the kernel */
+static int enabled_via_apicbase;
+
#endif
#ifdef CONFIG_X86_64
@@ -131,9 +134,6 @@ static struct clock_event_device lapic_clockevent = {
};
static DEFINE_PER_CPU(struct clock_event_device, lapic_events);
-/* Local APIC was disabled by the BIOS and enabled by the kernel */
-static int enabled_via_apicbase;
-
static unsigned long apic_phys;
/*
@@ -240,6 +240,7 @@ void __cpuinit enable_NMI_through_LVT0(void)
apic_write(APIC_LVT0, v);
}
+#ifdef CONFIG_X86_32
/**
* get_physical_broadcast - Get number of physical broadcast IDs
*/
@@ -247,6 +248,7 @@ int get_physical_broadcast(void)
{
return modern_apic() ? 0xff : 0xf;
}
+#endif
/**
* lapic_get_maxlvt - get the maximum number of local vector table entries
@@ -1291,6 +1293,32 @@ no_apic:
return -1;
}
+#ifdef CONFIG_X86_64
+void __init early_init_lapic_mapping(void)
+{
+ unsigned long phys_addr;
+
+ /*
+ * If no local APIC can be found then go out
+ * : it means there is no mpatable and MADT
+ */
+ if (!smp_found_config)
+ return;
+
+ phys_addr = mp_lapic_addr;
+
+ set_fixmap_nocache(FIX_APIC_BASE, phys_addr);
+ apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n",
+ APIC_BASE, phys_addr);
+
+ /*
+ * Fetch the APIC ID of the BSP in case we have a
+ * default configuration (or the MP table is broken).
+ */
+ boot_cpu_physical_apicid = read_apic_id();
+}
+#endif
+
/**
* init_apic_mappings - initialize APIC mappings
*/
@@ -1308,8 +1336,8 @@ void __init init_apic_mappings(void)
apic_phys = mp_lapic_addr;
set_fixmap_nocache(FIX_APIC_BASE, apic_phys);
- printk(KERN_DEBUG "mapped APIC to %08lx (%08lx)\n", APIC_BASE,
- apic_phys);
+ apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n",
+ APIC_BASE, apic_phys);
/*
* Fetch the APIC ID of the BSP in case we have a
@@ -1317,14 +1345,12 @@ void __init init_apic_mappings(void)
*/
if (boot_cpu_physical_apicid == -1U)
boot_cpu_physical_apicid = read_apic_id();
-
}
/*
* This initializes the IO-APIC and APIC hardware if this is
* a UP kernel.
*/
-
int apic_version[MAX_APICS];
int __init APIC_init_uniprocessor(void)
@@ -1682,11 +1708,6 @@ static int lapic_resume(struct sys_device *dev)
local_irq_save(flags);
-#ifdef CONFIG_X86_64
- if (x2apic)
- enable_x2apic();
- else
-#endif
{
/*
* Make sure the APICBASE points to the right address
@@ -1770,7 +1791,87 @@ static void apic_pm_activate(void) { }
#endif /* CONFIG_PM */
+#ifdef CONFIG_X86_64
+/*
+ * apic_is_clustered_box() -- Check if we can expect good TSC
+ *
+ * Thus far, the major user of this is IBM's Summit2 series:
+ *
+ * Clustered boxes may have unsynced TSC problems if they are
+ * multi-chassis. Use available data to take a good guess.
+ * If in doubt, go HPET.
+ */
+__cpuinit int apic_is_clustered_box(void)
+{
+ int i, clusters, zeros;
+ unsigned id;
+ u16 *bios_cpu_apicid;
+ DECLARE_BITMAP(clustermap, NUM_APIC_CLUSTERS);
+
+ /*
+ * there is not this kind of box with AMD CPU yet.
+ * Some AMD box with quadcore cpu and 8 sockets apicid
+ * will be [4, 0x23] or [8, 0x27] could be thought to
+ * vsmp box still need checking...
+ */
+ if ((boot_cpu_data.x86_vendor == X86_VENDOR_AMD) && !is_vsmp_box())
+ return 0;
+
+ bios_cpu_apicid = early_per_cpu_ptr(x86_bios_cpu_apicid);
+ bitmap_zero(clustermap, NUM_APIC_CLUSTERS);
+
+ for (i = 0; i < NR_CPUS; i++) {
+ /* are we being called early in kernel startup? */
+ if (bios_cpu_apicid) {
+ id = bios_cpu_apicid[i];
+ }
+ else if (i < nr_cpu_ids) {
+ if (cpu_present(i))
+ id = per_cpu(x86_bios_cpu_apicid, i);
+ else
+ continue;
+ }
+ else
+ break;
+ if (id != BAD_APICID)
+ __set_bit(APIC_CLUSTERID(id), clustermap);
+ }
+
+ /* Problem: Partially populated chassis may not have CPUs in some of
+ * the APIC clusters they have been allocated. Only present CPUs have
+ * x86_bios_cpu_apicid entries, thus causing zeroes in the bitmap.
+ * Since clusters are allocated sequentially, count zeros only if
+ * they are bounded by ones.
+ */
+ clusters = 0;
+ zeros = 0;
+ for (i = 0; i < NUM_APIC_CLUSTERS; i++) {
+ if (test_bit(i, clustermap)) {
+ clusters += 1 + zeros;
+ zeros = 0;
+ } else
+ ++zeros;
+ }
+
+ /* ScaleMP vSMPowered boxes have one cluster per board and TSCs are
+ * not guaranteed to be synced between boards
+ */
+ if (is_vsmp_box() && clusters > 1)
+ return 1;
+
+ /*
+ * If clusters > 2, then should be multi-chassis.
+ * May have to revisit this when multi-core + hyperthreaded CPUs come
+ * out, but AFAIK this will work even for them.
+ */
+ return (clusters > 2);
+}
+#endif
+
+/*
+ * APIC command line parameters
+ */
static int __init setup_disableapic(char *arg)
{
disable_apic = 1;
diff --git a/arch/x86/kernel/apic_64.c b/arch/x86/kernel/apic_64.c
index eeb6983..dca6c24 100644
--- a/arch/x86/kernel/apic_64.c
+++ b/arch/x86/kernel/apic_64.c
@@ -69,6 +69,9 @@ static int __init parse_lapic(char *arg)
return 0;
}
early_param("lapic", parse_lapic);
+/* Local APIC was disabled by the BIOS and enabled by the kernel */
+static int enabled_via_apicbase;
+
#endif
#ifdef CONFIG_X86_64
@@ -1279,6 +1282,7 @@ static int __init detect_init_APIC(void)
return 0;
}
+#ifdef CONFIG_X86_64
void __init early_init_lapic_mapping(void)
{
unsigned long phys_addr;
@@ -1302,6 +1306,7 @@ void __init early_init_lapic_mapping(void)
*/
boot_cpu_physical_apicid = read_apic_id();
}
+#endif
/**
* init_apic_mappings - initialize APIC mappings
@@ -1334,7 +1339,8 @@ void __init init_apic_mappings(void)
* Fetch the APIC ID of the BSP in case we have a
* default configuration (or the MP table is broken).
*/
- boot_cpu_physical_apicid = read_apic_id();
+ if (boot_cpu_physical_apicid == -1U)
+ boot_cpu_physical_apicid = read_apic_id();
}
/*
@@ -1782,6 +1788,7 @@ static void apic_pm_activate(void) { }
#endif /* CONFIG_PM */
+#ifdef CONFIG_X86_64
/*
* apic_is_clustered_box() -- Check if we can expect good TSC
*
@@ -1857,6 +1864,7 @@ __cpuinit int apic_is_clustered_box(void)
*/
return (clusters > 2);
}
+#endif
/*
* APIC command line parameters
--
1.5.4.5
--
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