[patch 098/198] x86_64: Final support for AMD dual core
From: akpm
Date: Tue Apr 12 2005 - 22:53:35 EST
From: "Andi Kleen" <ak@xxxxxxx>
Clean up the code greatly. Now uses the infrastructure from the Intel dual
core patch Should fix a final bug noticed by Tyan of not detecting the nodes
correctly in some corner cases.
Patch for x86-64 and i386
Signed-off-by: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
25-akpm/arch/i386/kernel/cpu/amd.c | 24 ++++++-----
25-akpm/arch/i386/kernel/cpu/common.c | 2
25-akpm/arch/x86_64/kernel/setup.c | 71 ++++++++++++++++++----------------
3 files changed, 53 insertions(+), 44 deletions(-)
diff -puN arch/i386/kernel/cpu/amd.c~x86_64-final-support-for-amd-dual-core arch/i386/kernel/cpu/amd.c
--- 25/arch/i386/kernel/cpu/amd.c~x86_64-final-support-for-amd-dual-core 2005-04-12 03:21:26.496108880 -0700
+++ 25-akpm/arch/i386/kernel/cpu/amd.c 2005-04-12 03:21:26.502107968 -0700
@@ -24,6 +24,9 @@ __asm__(".align 4\nvide: ret");
static void __init init_amd(struct cpuinfo_x86 *c)
{
+#ifdef CONFIG_SMP
+ int cpu = c == &boot_cpu_data ? 0 : c - cpu_data;
+#endif
u32 l, h;
int mbytes = num_physpages >> (20-PAGE_SHIFT);
int r;
@@ -195,16 +198,17 @@ static void __init init_amd(struct cpuin
c->x86_num_cores = 1;
}
- detect_ht(c);
-
-#ifdef CONFIG_X86_HT
- /* AMD dual core looks like HT but isn't really. Hide it from the
- scheduler. This works around problems with the domain scheduler.
- Also probably gives slightly better scheduling and disables
- SMT nice which is harmful on dual core.
- TBD tune the domain scheduler for dual core. */
- if (cpu_has(c, X86_FEATURE_CMP_LEGACY))
- smp_num_siblings = 1;
+#ifdef CONFIG_SMP
+ /*
+ * On a AMD dual core setup the lower bits of the APIC id
+ * distingush the cores. Assumes number of cores is a power
+ * of two.
+ */
+ if (c->x86_num_cores > 1) {
+ cpu_core_id[cpu] = cpu >> hweight32(c->x86_num_cores - 1);
+ printk(KERN_INFO "CPU %d(%d) -> Core %d\n",
+ cpu, c->x86_num_cores, cpu_core_id[cpu]);
+ }
#endif
}
diff -puN arch/i386/kernel/cpu/common.c~x86_64-final-support-for-amd-dual-core arch/i386/kernel/cpu/common.c
--- 25/arch/i386/kernel/cpu/common.c~x86_64-final-support-for-amd-dual-core 2005-04-12 03:21:26.497108728 -0700
+++ 25-akpm/arch/i386/kernel/cpu/common.c 2005-04-12 03:21:26.503107816 -0700
@@ -437,7 +437,7 @@ void __init detect_ht(struct cpuinfo_x86
int index_msb, tmp;
int cpu = smp_processor_id();
- if (!cpu_has(c, X86_FEATURE_HT))
+ if (!cpu_has(c, X86_FEATURE_HT) || cpu_has(c, X86_FEATURE_CMP_LEGACY))
return;
cpuid(1, &eax, &ebx, &ecx, &edx);
diff -puN arch/x86_64/kernel/setup.c~x86_64-final-support-for-amd-dual-core arch/x86_64/kernel/setup.c
--- 25/arch/x86_64/kernel/setup.c~x86_64-final-support-for-amd-dual-core 2005-04-12 03:21:26.499108424 -0700
+++ 25-akpm/arch/x86_64/kernel/setup.c 2005-04-12 03:21:26.504107664 -0700
@@ -715,14 +715,46 @@ static void __init display_cacheinfo(str
}
}
+#ifdef CONFIG_SMP
+/*
+ * On a AMD dual core setup the lower bits of the APIC id distingush the cores.
+ * Assumes number of cores is a power of two.
+ */
+static void __init amd_detect_cmp(struct cpuinfo_x86 *c)
+{
+#ifdef CONFIG_SMP
+ int cpu = c->x86_apicid;
+ int node = 0;
+ if (c->x86_num_cores == 1)
+ return;
+ cpu_core_id[cpu] = cpu >> hweight32(c->x86_num_cores - 1);
+
+#ifdef CONFIG_NUMA
+ /* When an ACPI SRAT table is available use the mappings from SRAT
+ instead. */
+ if (acpi_numa <= 0) {
+ node = cpu_core_id[cpu];
+ if (!node_online(node))
+ node = first_node(node_online_map);
+ cpu_to_node[cpu] = node;
+ } else {
+ node = cpu_to_node[cpu];
+ }
+#endif
+ printk(KERN_INFO "CPU %d(%d) -> Node %d -> Core %d\n",
+ cpu, c->x86_num_cores, node, cpu_core_id[cpu]);
+#endif
+}
+#else
+static void __init amd_detect_cmp(struct cpuinfo_x86 *c)
+{
+}
+#endif
static int __init init_amd(struct cpuinfo_x86 *c)
{
int r;
int level;
-#ifdef CONFIG_NUMA
- int cpu;
-#endif
/* Bit 31 in normal CPUID used for nonstandard 3DNow ID;
3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway */
@@ -750,21 +782,7 @@ static int __init init_amd(struct cpuinf
if (c->x86_num_cores & (c->x86_num_cores - 1))
c->x86_num_cores = 1;
-#ifdef CONFIG_NUMA
- /* On a dual core setup the lower bits of apic id
- distingush the cores. Fix up the CPU<->node mappings
- here based on that.
- Assumes number of cores is a power of two.
- When using SRAT use mapping from SRAT. */
- cpu = c->x86_apicid;
- if (acpi_numa <= 0 && c->x86_num_cores > 1) {
- cpu_to_node[cpu] = cpu >> hweight32(c->x86_num_cores - 1);
- if (!node_online(cpu_to_node[cpu]))
- cpu_to_node[cpu] = first_node(node_online_map);
- }
- printk(KERN_INFO "CPU %d(%d) -> Node %d\n",
- cpu, c->x86_num_cores, cpu_to_node[cpu]);
-#endif
+ amd_detect_cmp(c);
}
return r;
@@ -777,7 +795,7 @@ static void __init detect_ht(struct cpui
int index_msb, tmp;
int cpu = smp_processor_id();
- if (!cpu_has(c, X86_FEATURE_HT))
+ if (!cpu_has(c, X86_FEATURE_HT) || cpu_has(c, X86_FEATURE_CMP_LEGACY))
return;
cpuid(1, &eax, &ebx, &ecx, &edx);
@@ -819,6 +837,7 @@ static void __init detect_ht(struct cpui
if (smp_num_siblings & (smp_num_siblings - 1))
index_msb++;
+ /* RED-PEN surely this must run in the non HT case too! -AK */
cpu_core_id[cpu] = phys_pkg_id(index_msb);
if (c->x86_num_cores > 1)
@@ -828,19 +847,6 @@ static void __init detect_ht(struct cpui
#endif
}
-static void __init sched_cmp_hack(struct cpuinfo_x86 *c)
-{
-#ifdef CONFIG_SMP
- /* AMD dual core looks like HT but isn't really. Hide it from the
- scheduler. This works around problems with the domain scheduler.
- Also probably gives slightly better scheduling and disables
- SMT nice which is harmful on dual core.
- TBD tune the domain scheduler for dual core. */
- if (c->x86_vendor == X86_VENDOR_AMD && cpu_has(c, X86_FEATURE_CMP_LEGACY))
- smp_num_siblings = 1;
-#endif
-}
-
/*
* find out the number of processor cores on the die
*/
@@ -1009,7 +1015,6 @@ void __init identify_cpu(struct cpuinfo_
select_idle_routine(c);
detect_ht(c);
- sched_cmp_hack(c);
/*
* On SMP, boot_cpu_data holds the common feature set between
_
-
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