lkml.org 
[lkml]   [2013]   [Sep]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2 3/6] x86 / ACPI: simplify _acpi_map_lsapic()
Date
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)
--
1.7.9.5


\
 
 \ /
  Last update: 2013-09-02 06:41    [W:0.087 / U:0.548 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site