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RISC-V: Move cpuid to hartid mapping to SMP.

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Currently, logical CPU id to physical hartid mapping is defined for both
smp and non-smp configurations. This is not required as we need this
only for smp configuration.  The mapping function can define directly
boot_cpu_hartid for non-smp use case.

The reverse mapping function i.e. hartid to cpuid can be called for any
valid but not booted harts. So it should return default cpu 0 only if it
is a boot hartid.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Atish Patra 2019-02-22 11:41:36 -08:00 committed by Palmer Dabbelt
parent e15c6e3706
commit 78d1daa364
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GPG Key ID: EF4CA1502CCBAB41
3 changed files with 22 additions and 14 deletions
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18
arch/riscv/include/asm/smp.h
View File

@ -19,16 +19,17 @@
#include <linux/thread_info.h>
#define INVALID_HARTID ULONG_MAX
struct seq_file;
extern unsigned long boot_cpu_hartid;
#ifdef CONFIG_SMP
/*
* Mapping between linux logical cpu index and hartid.
*/
extern unsigned long __cpuid_to_hartid_map[NR_CPUS];
#define cpuid_to_hartid_map(cpu) __cpuid_to_hartid_map[cpu]
struct seq_file;
#ifdef CONFIG_SMP
/* print IPI stats */
void show_ipi_stats(struct seq_file *p, int prec);
@ -58,7 +59,14 @@ static inline void show_ipi_stats(struct seq_file *p, int prec)
static inline int riscv_hartid_to_cpuid(int hartid)
{
return 0;
if (hartid == boot_cpu_hartid)
return 0;
return -1;
}
static inline unsigned long cpuid_to_hartid_map(int cpu)
{
return boot_cpu_hartid;
}
static inline void riscv_cpuid_to_hartid_mask(const struct cpumask *in,

9
arch/riscv/kernel/setup.c
View File

@ -61,15 +61,6 @@ EXPORT_SYMBOL(empty_zero_page);
atomic_t hart_lottery;
unsigned long boot_cpu_hartid;
unsigned long __cpuid_to_hartid_map[NR_CPUS] = {
[0 ... NR_CPUS-1] = INVALID_HARTID
};
void __init smp_setup_processor_id(void)
{
cpuid_to_hartid_map(0) = boot_cpu_hartid;
}
#ifdef CONFIG_BLK_DEV_INITRD
static void __init setup_initrd(void)
{

9
arch/riscv/kernel/smp.c
View File

@ -36,6 +36,15 @@ enum ipi_message_type {
IPI_MAX
};
unsigned long __cpuid_to_hartid_map[NR_CPUS] = {
[0 ... NR_CPUS-1] = INVALID_HARTID
};
void __init smp_setup_processor_id(void)
{
cpuid_to_hartid_map(0) = boot_cpu_hartid;
}
/* A collection of single bit ipi messages. */
static struct {
unsigned long stats[IPI_MAX] ____cacheline_aligned;