From: Jiang Liu jiang.liu@huawei.com

For cpu hot add, we evaluate _MAT or parse MADT twice to get APIC id, here is the code logic: acpi_processor_add() acpi_processor_get_info() acpi_get_cpuid() will evaluate _MAT or parse MADT; acpi_processor_hotadd_init() acpi_map_lsapic() will evaluate _MAT again;

This can be done more effectively, this patch introduces apic_id in struct processor to save parsed APIC id, and then we can use it and remove the duplicated _MAT evaluation.

Signed-off-by: Jiang Liu jiang.liu@huawei.com Signed-off-by: Hanjun Guo hanjun.guo@linaro.org --- drivers/acpi/acpi_processor.c | 4 +++- drivers/acpi/processor_core.c | 26 +++++++++++++++++++++----- include/acpi/processor.h | 3 +++ 3 files changed, 27 insertions(+), 6 deletions(-)

diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c index f29e06e..f89f914 100644 --- a/drivers/acpi/acpi_processor.c +++ b/drivers/acpi/acpi_processor.c @@ -270,7 +270,9 @@ static int acpi_processor_get_info(struct acpi_device *device) device_declaration = 1; pr->acpi_id = value; } - cpu_index = acpi_get_cpuid(pr->handle, device_declaration, pr->acpi_id); + pr->apic_id = acpi_get_apicid(pr->handle, device_declaration, + pr->acpi_id); + cpu_index = acpi_map_cpuid(pr->apic_id, pr->acpi_id);

/* Handle UP system running SMP kernel, with no LAPIC in MADT */ if (!cpu0_initialized && (cpu_index == -1) && diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c index cf34d90..b3171f3 100644 --- a/drivers/acpi/processor_core.c +++ b/drivers/acpi/processor_core.c @@ -162,16 +162,23 @@ exit: return apic_id; }

-int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id) +int acpi_get_apicid(acpi_handle handle, int type, u32 acpi_id) { -#ifdef CONFIG_SMP - int i; -#endif - int apic_id = -1; + int apic_id;

apic_id = map_mat_entry(handle, type, acpi_id); if (apic_id == -1) apic_id = map_madt_entry(type, acpi_id); + + return apic_id; +} + +int acpi_map_cpuid(int apic_id, u32 acpi_id) +{ +#ifdef CONFIG_SMP + int i; +#endif + if (apic_id == -1) { /* * On UP processor, there is no _MAT or MADT table. @@ -211,6 +218,15 @@ int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id) #endif return -1; } + +int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id) +{ + int apic_id; + + apic_id = acpi_get_apicid(handle, type, acpi_id); + + return acpi_map_cpuid(apic_id, acpi_id); +} EXPORT_SYMBOL_GPL(acpi_get_cpuid);

static bool __init processor_physically_present(acpi_handle handle) diff --git a/include/acpi/processor.h b/include/acpi/processor.h index 66096d0..7816e45 100644 --- a/include/acpi/processor.h +++ b/include/acpi/processor.h @@ -199,6 +199,7 @@ struct acpi_processor_flags { struct acpi_processor { acpi_handle handle; u32 acpi_id; + u32 apic_id; u32 id; u32 pblk; int performance_platform_limit; @@ -314,6 +315,8 @@ static inline int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)

/* in processor_core.c */ void acpi_processor_set_pdc(acpi_handle handle); +int acpi_get_apicid(acpi_handle, int type, u32 acpi_id); +int acpi_map_cpuid(int apic_id, u32 acpi_id); int acpi_get_cpuid(acpi_handle, int type, u32 acpi_id);

/* in processor_throttling.c */

From: Jiang Liu jiang.liu@huawei.com

In acpi_register_lapic(), it will generates a new logical cpu number and maps to the local APIC id, this logical cpu number can be returned to simplify _acpi_map_lsapic() implementation.

Signed-off-by: Jiang Liu jiang.liu@huawei.com Signed-off-by: Hanjun Guo hanjun.guo@linaro.org --- arch/x86/include/asm/mpspec.h | 2 +- arch/x86/kernel/acpi/boot.c | 50 +++++++++++++---------------------------- arch/x86/kernel/apic/apic.c | 8 ++++--- 3 files changed, 22 insertions(+), 38 deletions(-)

diff --git a/arch/x86/include/asm/mpspec.h b/arch/x86/include/asm/mpspec.h index 626cf70..3142a94 100644 --- a/arch/x86/include/asm/mpspec.h +++ b/arch/x86/include/asm/mpspec.h @@ -94,7 +94,7 @@ static inline void early_reserve_e820_mpc_new(void) { } #define default_get_smp_config x86_init_uint_noop #endif

-void generic_processor_info(int apicid, int version); +int generic_processor_info(int apicid, int version); #ifdef CONFIG_ACPI extern void mp_register_ioapic(int id, u32 address, u32 gsi_base); extern void mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 3e186d1..ab89c2b 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -195,24 +195,31 @@ static int __init acpi_parse_madt(struct acpi_table_header *table) return 0; }

-static void acpi_register_lapic(int id, u8 enabled) +/** + * acpi_register_lapic - register a local apic and generates a logic cpu number + * @id: local apic id to register + * @enabled: this cpu is enabled or not + * + * Returns the logic cpu number which maps to the local apic + */ +static int acpi_register_lapic(int id, u8 enabled) { unsigned int ver = 0;

if (id >= (MAX_LOCAL_APIC-1)) { printk(KERN_INFO PREFIX "skipped apicid that is too big\n"); - return; + return -EINVAL; }

if (!enabled) { ++disabled_cpus; - return; + return -EINVAL; }

if (boot_cpu_physical_apicid != -1U) ver = apic_version[boot_cpu_physical_apicid];

- generic_processor_info(id, ver); + return generic_processor_info(id, ver); }

static int __init @@ -622,44 +629,19 @@ static void acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)

static int _acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu) { - cpumask_var_t tmp_map, new_map; int cpu; - int retval = -ENOMEM; - - if (!alloc_cpumask_var(&tmp_map, GFP_KERNEL)) - goto out;

- if (!alloc_cpumask_var(&new_map, GFP_KERNEL)) - goto free_tmp_map; - - cpumask_copy(tmp_map, cpu_present_mask); - acpi_register_lapic(physid, ACPI_MADT_ENABLED); - - /* - * If acpi_register_lapic successfully generates a new logical cpu - * number, then the following will get us exactly what was mapped - */ - cpumask_andnot(new_map, cpu_present_mask, tmp_map); - if (cpumask_empty(new_map)) { - printk ("Unable to map lapic to logical cpu number\n"); - retval = -EINVAL; - goto free_new_map; + cpu = acpi_register_lapic(physid, ACPI_MADT_ENABLED); + if (cpu < 0) { + pr_info(PREFIX "Unable to map lapic to logical cpu number\n"); + return cpu; }

acpi_processor_set_pdc(handle); - - cpu = cpumask_first(new_map); acpi_map_cpu2node(handle, cpu, physid);

*pcpu = cpu; - retval = 0; - -free_new_map: - free_cpumask_var(new_map); -free_tmp_map: - free_cpumask_var(tmp_map); -out: - return retval; + return 0; }

/* wrapper to silence section mismatch warning */ diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index eca89c5..c98fe31 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -2107,7 +2107,7 @@ void disconnect_bsp_APIC(int virt_wire_setup) apic_write(APIC_LVT1, value); }

-void generic_processor_info(int apicid, int version) +int generic_processor_info(int apicid, int version) { int cpu, max = nr_cpu_ids; bool boot_cpu_detected = physid_isset(boot_cpu_physical_apicid, @@ -2127,7 +2127,7 @@ void generic_processor_info(int apicid, int version) " Processor %d/0x%x ignored.\n", max, thiscpu, apicid);

disabled_cpus++; - return; + return -ENODEV; }

if (num_processors >= nr_cpu_ids) { @@ -2138,7 +2138,7 @@ void generic_processor_info(int apicid, int version) " Processor %d/0x%x ignored.\n", max, thiscpu, apicid);

disabled_cpus++; - return; + return -EINVAL; }

num_processors++; @@ -2183,6 +2183,8 @@ void generic_processor_info(int apicid, int version) #endif set_cpu_possible(cpu, true); set_cpu_present(cpu, true); + + return cpu; }

int hard_smp_processor_id(void)

acpi_processor_errata() is only called in acpi_processor_get_info(), and the argument 'pr' passed to acpi_processor_errata() will never be NULL, so the if (!pr) check is unnecessary and can be removed.

Since the 'pr' argument is not used by acpi_processor_errata() any more, so change the argument into void too.

Signed-off-by: Hanjun Guo hanjun.guo@linaro.org --- drivers/acpi/acpi_processor.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c index 5364d02..7ce0750 100644 --- a/drivers/acpi/acpi_processor.c +++ b/drivers/acpi/acpi_processor.c @@ -140,15 +140,11 @@ static int acpi_processor_errata_piix4(struct pci_dev *dev) return 0; }

-static int acpi_processor_errata(struct acpi_processor *pr) +static int acpi_processor_errata(void) { int result = 0; struct pci_dev *dev = NULL;

- - if (!pr) - return -EINVAL; - /* * PIIX4 */ @@ -220,7 +216,7 @@ static int acpi_processor_get_info(struct acpi_device *device) acpi_status status = AE_OK; static int cpu0_initialized;

- acpi_processor_errata(pr); + acpi_processor_errata();

/* * Check to see if we have bus mastering arbitration control. This