x86/topology: Create logical package id

For per package oriented services we must be able to rely on the number of CPU
packages to be within bounds. Create a tracking facility, which

- calculates the number of possible packages depending on nr_cpu_ids after boot

- makes sure that the package id is within the number of possible packages. If
  the apic id is outside we map it to a logical package id if there is enough
  space available.

Provide interfaces for drivers to query the mapping and do translations from
physcial to logical ids.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andi Kleen <andi.kleen@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Harish Chegondi <harish.chegondi@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Luis R. Rodriguez <mcgrof@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Toshi Kani <toshi.kani@hp.com>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/20160222221011.541071755@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Thomas Gleixner 2016-02-22 22:19:15 +00:00 committed by Ingo Molnar
parent 1f2569fac6
commit 1f12e32f4c
6 changed files with 142 additions and 0 deletions

View File

@ -129,6 +129,8 @@ struct cpuinfo_x86 {
u16 booted_cores;
/* Physical processor id: */
u16 phys_proc_id;
/* Logical processor id: */
u16 logical_proc_id;
/* Core id: */
u16 cpu_core_id;
/* Compute unit id */

View File

@ -119,12 +119,23 @@ static inline void setup_node_to_cpumask_map(void) { }
extern const struct cpumask *cpu_coregroup_mask(int cpu);
#define topology_logical_package_id(cpu) (cpu_data(cpu).logical_proc_id)
#define topology_physical_package_id(cpu) (cpu_data(cpu).phys_proc_id)
#define topology_core_id(cpu) (cpu_data(cpu).cpu_core_id)
#ifdef ENABLE_TOPO_DEFINES
#define topology_core_cpumask(cpu) (per_cpu(cpu_core_map, cpu))
#define topology_sibling_cpumask(cpu) (per_cpu(cpu_sibling_map, cpu))
extern unsigned int __max_logical_packages;
#define topology_max_packages() (__max_logical_packages)
int topology_update_package_map(unsigned int apicid, unsigned int cpu);
extern int topology_phys_to_logical_pkg(unsigned int pkg);
#else
#define topology_max_packages() (1)
static inline int
topology_update_package_map(unsigned int apicid, unsigned int cpu) { return 0; }
static inline int topology_phys_to_logical_pkg(unsigned int pkg) { return 0; }
#endif
static inline void arch_fix_phys_package_id(int num, u32 slot)

View File

@ -2077,6 +2077,20 @@ int generic_processor_info(int apicid, int version)
} else
cpu = cpumask_next_zero(-1, cpu_present_mask);
/*
* This can happen on physical hotplug. The sanity check at boot time
* is done from native_smp_prepare_cpus() after num_possible_cpus() is
* established.
*/
if (topology_update_package_map(apicid, cpu) < 0) {
int thiscpu = max + disabled_cpus;
pr_warning("ACPI: Package limit reached. Processor %d/0x%x ignored.\n",
thiscpu, apicid);
disabled_cpus++;
return -ENOSPC;
}
/*
* Validate version
*/

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@ -975,6 +975,8 @@ static void identify_cpu(struct cpuinfo_x86 *c)
#ifdef CONFIG_NUMA
numa_add_cpu(smp_processor_id());
#endif
/* The boot/hotplug time assigment got cleared, restore it */
c->logical_proc_id = topology_phys_to_logical_pkg(c->phys_proc_id);
}
/*

View File

@ -160,6 +160,19 @@ static void early_init_intel(struct cpuinfo_x86 *c)
pr_info("Disabling PGE capability bit\n");
setup_clear_cpu_cap(X86_FEATURE_PGE);
}
if (c->cpuid_level >= 0x00000001) {
u32 eax, ebx, ecx, edx;
cpuid(0x00000001, &eax, &ebx, &ecx, &edx);
/*
* If HTT (EDX[28]) is set EBX[16:23] contain the number of
* apicids which are reserved per package. Store the resulting
* shift value for the package management code.
*/
if (edx & (1U << 28))
c->x86_coreid_bits = get_count_order((ebx >> 16) & 0xff);
}
}
#ifdef CONFIG_X86_32

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@ -97,6 +97,14 @@ DEFINE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_llc_shared_map);
DEFINE_PER_CPU_READ_MOSTLY(struct cpuinfo_x86, cpu_info);
EXPORT_PER_CPU_SYMBOL(cpu_info);
/* Logical package management. We might want to allocate that dynamically */
static int *physical_to_logical_pkg __read_mostly;
static unsigned long *physical_package_map __read_mostly;;
static unsigned long *logical_package_map __read_mostly;
static unsigned int max_physical_pkg_id __read_mostly;
unsigned int __max_logical_packages __read_mostly;
EXPORT_SYMBOL(__max_logical_packages);
static inline void smpboot_setup_warm_reset_vector(unsigned long start_eip)
{
unsigned long flags;
@ -251,6 +259,97 @@ static void notrace start_secondary(void *unused)
cpu_startup_entry(CPUHP_ONLINE);
}
int topology_update_package_map(unsigned int apicid, unsigned int cpu)
{
unsigned int new, pkg = apicid >> boot_cpu_data.x86_coreid_bits;
/* Called from early boot ? */
if (!physical_package_map)
return 0;
if (pkg >= max_physical_pkg_id)
return -EINVAL;
/* Set the logical package id */
if (test_and_set_bit(pkg, physical_package_map))
goto found;
if (pkg < __max_logical_packages) {
set_bit(pkg, logical_package_map);
physical_to_logical_pkg[pkg] = pkg;
goto found;
}
new = find_first_zero_bit(logical_package_map, __max_logical_packages);
if (new >= __max_logical_packages) {
physical_to_logical_pkg[pkg] = -1;
pr_warn("APIC(%x) Package %u exceeds logical package map\n",
apicid, pkg);
return -ENOSPC;
}
set_bit(new, logical_package_map);
pr_info("APIC(%x) Converting physical %u to logical package %u\n",
apicid, pkg, new);
physical_to_logical_pkg[pkg] = new;
found:
cpu_data(cpu).logical_proc_id = physical_to_logical_pkg[pkg];
return 0;
}
/**
* topology_phys_to_logical_pkg - Map a physical package id to a logical
*
* Returns logical package id or -1 if not found
*/
int topology_phys_to_logical_pkg(unsigned int phys_pkg)
{
if (phys_pkg >= max_physical_pkg_id)
return -1;
return physical_to_logical_pkg[phys_pkg];
}
EXPORT_SYMBOL(topology_phys_to_logical_pkg);
static void __init smp_init_package_map(void)
{
unsigned int ncpus, cpu;
size_t size;
/*
* Today neither Intel nor AMD support heterogenous systems. That
* might change in the future....
*/
ncpus = boot_cpu_data.x86_max_cores * smp_num_siblings;
__max_logical_packages = DIV_ROUND_UP(nr_cpu_ids, ncpus);
/*
* Possibly larger than what we need as the number of apic ids per
* package can be smaller than the actual used apic ids.
*/
max_physical_pkg_id = DIV_ROUND_UP(MAX_LOCAL_APIC, ncpus);
size = max_physical_pkg_id * sizeof(unsigned int);
physical_to_logical_pkg = kmalloc(size, GFP_KERNEL);
memset(physical_to_logical_pkg, 0xff, size);
size = BITS_TO_LONGS(max_physical_pkg_id) * sizeof(unsigned long);
physical_package_map = kzalloc(size, GFP_KERNEL);
size = BITS_TO_LONGS(__max_logical_packages) * sizeof(unsigned long);
logical_package_map = kzalloc(size, GFP_KERNEL);
pr_info("Max logical packages: %u\n", __max_logical_packages);
for_each_present_cpu(cpu) {
unsigned int apicid = apic->cpu_present_to_apicid(cpu);
if (apicid == BAD_APICID || !apic->apic_id_valid(apicid))
continue;
if (!topology_update_package_map(apicid, cpu))
continue;
pr_warn("CPU %u APICId %x disabled\n", cpu, apicid);
per_cpu(x86_bios_cpu_apicid, cpu) = BAD_APICID;
set_cpu_possible(cpu, false);
set_cpu_present(cpu, false);
}
}
void __init smp_store_boot_cpu_info(void)
{
int id = 0; /* CPU 0 */
@ -258,6 +357,7 @@ void __init smp_store_boot_cpu_info(void)
*c = boot_cpu_data;
c->cpu_index = id;
smp_init_package_map();
}
/*