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sparc64: add hot-patched and inlined get_tick()

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Add the new get_tick() function that is hot-patched during boot based on
processor we are booting on.

Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Reviewed-by: Steven Sistare <steven.sistare@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Tatashin
2017-06-12 16:41:47 -04:00
committed by David S. Miller
parent 83e8eb99d9
commit 4929c83a6c
3 changed files with 87 additions and 6 deletions
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28
arch/sparc/kernel/time_64.c
View File

@@ -47,15 +47,13 @@
#include <asm/cpudata.h>
#include <linux/uaccess.h>
#include <asm/irq_regs.h>
#include <asm/cacheflush.h>
#include "entry.h"
#include "kernel.h"
DEFINE_SPINLOCK(rtc_lock);
#define TICK_PRIV_BIT (1UL << 63)
#define TICKCMP_IRQ_BIT (1UL << 63)
#ifdef CONFIG_SMP
unsigned long profile_pc(struct pt_regs *regs)
{
@@ -290,9 +288,6 @@ static struct sparc64_tick_ops stick_operations __read_mostly = {
* 2) write high
* 3) write low
*/
#define HBIRD_STICKCMP_ADDR 0x1fe0000f060UL
#define HBIRD_STICK_ADDR 0x1fe0000f070UL
static unsigned long __hbird_read_stick(void)
{
unsigned long ret, tmp1, tmp2, tmp3;
@@ -777,6 +772,26 @@ static u64 clocksource_tick_read(struct clocksource *cs)
return tick_operations.get_tick();
}
static void __init get_tick_patch(void)
{
unsigned int *addr, *instr, i;
struct get_tick_patch *p;
if (tlb_type == spitfire && is_hummingbird())
return;
for (p = &__get_tick_patch; p < &__get_tick_patch_end; p++) {
instr = (tlb_type == spitfire) ? p->tick : p->stick;
addr = (unsigned int *)(unsigned long)p->addr;
for (i = 0; i < GET_TICK_NINSTR; i++) {
addr[i] = instr[i];
/* ensure that address is modified before flush */
wmb();
flushi(&addr[i]);
}
}
}
static void init_tick_ops(struct sparc64_tick_ops *ops)
{
unsigned long freq, quotient, tick;
@@ -789,6 +804,7 @@ static void init_tick_ops(struct sparc64_tick_ops *ops)
ops->ticks_per_nsec_quotient = quotient;
ops->frequency = freq;
tick_operations = *ops;
get_tick_patch();
}
void __init time_init_early(void)

5
arch/sparc/kernel/vmlinux.lds.S
View File

@@ -149,6 +149,11 @@ SECTIONS
*(.sun_m7_2insn_patch)
__sun_m7_2insn_patch_end = .;
}
.get_tick_patch : {
__get_tick_patch = .;
*(.get_tick_patch)
__get_tick_patch_end = .;
}
PERCPU_SECTION(SMP_CACHE_BYTES)
#ifdef CONFIG_JUMP_LABEL