Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-07 20:51:47 +00:00
Code Issues Packages Projects Releases Wiki Activity

[PATCH] x86_64: 386/x86-64 Further AMD dual core fixes

Browse Source 
- Remove duplicated ifdef
- Make core_id match what Intel uses
- Initialize phys_proc_id correctly for non DC case
- Handle non power of two core numbers.

Fixes for both i386 and x86-64

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andi Kleen 2005-05-20 14:27:55 -07:00 committed by Linus Torvalds
parent b39c4fab25
commit b41e29398a
3 changed files with 19 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
arch/i386/kernel/cpu/amd.c
View File

@ -195,7 +195,7 @@ static void __init init_amd(struct cpuinfo_x86 *c)
c->x86_num_cores = 1;
}
#ifdef CONFIG_X86_SMP
#ifdef CONFIG_X86_HT
/*
* On a AMD dual core setup the lower bits of the APIC id
* distingush the cores. Assumes number of cores is a power
@ -203,8 +203,11 @@ static void __init init_amd(struct cpuinfo_x86 *c)
*/
if (c->x86_num_cores > 1) {
int cpu = smp_processor_id();
/* Fix up the APIC ID following AMD specifications. */
cpu_core_id[cpu] >>= hweight32(c->x86_num_cores - 1);
unsigned bits = 0;
while ((1 << bits) < c->x86_num_cores)
bits++;
cpu_core_id[cpu] = phys_proc_id[cpu] & ((1<<bits)-1);
phys_proc_id[cpu] >>= bits;
printk(KERN_INFO "CPU %d(%d) -> Core %d\n",
cpu, c->x86_num_cores, cpu_core_id[cpu]);
}

5
arch/i386/kernel/cpu/common.c
View File

@ -244,11 +244,8 @@ static void __init early_cpu_detect(void)
early_intel_workaround(c);
#ifdef CONFIG_SMP
#ifdef CONFIG_X86_HT
phys_proc_id[smp_processor_id()] =
#endif
cpu_core_id[smp_processor_id()] = (cpuid_ebx(1) >> 24) & 0xff;
phys_proc_id[smp_processor_id()] = (cpuid_ebx(1) >> 24) & 0xff;
#endif
}

25
arch/x86_64/kernel/setup.c
View File

@ -719,7 +719,6 @@ static void __init display_cacheinfo(struct cpuinfo_x86 *c)
}
}
#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.
@ -729,16 +728,24 @@ static void __init amd_detect_cmp(struct cpuinfo_x86 *c)
#ifdef CONFIG_SMP
int cpu = smp_processor_id();
int node = 0;
unsigned bits;
if (c->x86_num_cores == 1)
return;
/* Fix up the APIC ID following the AMD specification. */
cpu_core_id[cpu] >>= hweight32(c->x86_num_cores - 1);
bits = 0;
while ((1 << bits) < c->x86_num_cores)
bits++;
/* Low order bits define the core id (index of core in socket) */
cpu_core_id[cpu] = phys_proc_id[cpu] & ((1 << bits)-1);
/* Convert the APIC ID into the socket ID */
phys_proc_id[cpu] >>= bits;
#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];
node = phys_proc_id[cpu];
if (!node_online(node))
node = first_node(node_online_map);
cpu_to_node[cpu] = node;
@ -746,18 +753,11 @@ static void __init amd_detect_cmp(struct cpuinfo_x86 *c)
node = cpu_to_node[cpu];
}
#endif
/* For now: - better than BAD_APIC_ID at least*/
phys_proc_id[cpu] = cpu_core_id[cpu];
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)
{
@ -963,8 +963,7 @@ void __init early_identify_cpu(struct cpuinfo_x86 *c)
}
#ifdef CONFIG_SMP
phys_proc_id[smp_processor_id()] =
cpu_core_id[smp_processor_id()] = (cpuid_ebx(1) >> 24) & 0xff;
phys_proc_id[smp_processor_id()] = (cpuid_ebx(1) >> 24) & 0xff;
#endif
}