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powerpc/powernv: Add OPAL call to resync timebase on wakeup 

During "Fast-sleep" and deeper power savings state, decrementer and
timebase could be stopped making it out of sync with rest
of the cores in the system.

Add a firmware call to request platform to resync timebase
using low level platform methods.

Signed-off-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Signed-off-by: Preeti U. Murthy <preeti@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Vaidyanathan Srinivasan 2014-02-26 05:38:43 +05:30 committed by Benjamin Herrenschmidt
parent aca79d2b6e
commit 97eb001f03
4 changed files with 31 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/include/asm/opal.h
View File

@ -154,6 +154,7 @@ extern int opal_enter_rtas(struct rtas_args *args,
#define OPAL_FLASH_VALIDATE 76
#define OPAL_FLASH_MANAGE 77
#define OPAL_FLASH_UPDATE 78
#define OPAL_RESYNC_TIMEBASE 79
#define OPAL_GET_MSG 85
#define OPAL_CHECK_ASYNC_COMPLETION 86
#define OPAL_SYNC_HOST_REBOOT 87
@ -865,6 +866,7 @@ extern void opal_flash_init(void);
extern int opal_machine_check(struct pt_regs *regs);
extern void opal_shutdown(void);
extern int opal_resync_timebase(void);
extern void opal_lpc_init(void);

2
arch/powerpc/kernel/exceptions-64s.S
View File

@ -145,7 +145,7 @@ BEGIN_FTR_SECTION
/* Fast Sleep wakeup on PowerNV */
8: GET_PACA(r13)
b .power7_wakeup_loss
b .power7_wakeup_tb_loss
9:
END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)

27
arch/powerpc/kernel/idle_power7.S
View File

@ -17,6 +17,7 @@
#include <asm/ppc-opcode.h>
#include <asm/hw_irq.h>
#include <asm/kvm_book3s_asm.h>
#include <asm/opal.h>
#undef DEBUG
@ -125,6 +126,32 @@ _GLOBAL(power7_sleep)
b power7_powersave_common
/* No return */
_GLOBAL(power7_wakeup_tb_loss)
ld r2,PACATOC(r13);
ld r1,PACAR1(r13)
/* Time base re-sync */
li r0,OPAL_RESYNC_TIMEBASE
LOAD_REG_ADDR(r11,opal);
ld r12,8(r11);
ld r2,0(r11);
mtctr r12
bctrl
/* TODO: Check r3 for failure */
REST_NVGPRS(r1)
REST_GPR(2, r1)
ld r3,_CCR(r1)
ld r4,_MSR(r1)
ld r5,_NIP(r1)
addi r1,r1,INT_FRAME_SIZE
mtcr r3
mfspr r3,SPRN_SRR1 /* Return SRR1 */
mtspr SPRN_SRR1,r4
mtspr SPRN_SRR0,r5
rfid
_GLOBAL(power7_wakeup_loss)
ld r1,PACAR1(r13)
REST_NVGPRS(r1)

1
arch/powerpc/platforms/powernv/opal-wrappers.S
View File

@ -126,6 +126,7 @@ OPAL_CALL(opal_return_cpu, OPAL_RETURN_CPU);
OPAL_CALL(opal_validate_flash, OPAL_FLASH_VALIDATE);
OPAL_CALL(opal_manage_flash, OPAL_FLASH_MANAGE);
OPAL_CALL(opal_update_flash, OPAL_FLASH_UPDATE);
OPAL_CALL(opal_resync_timebase, OPAL_RESYNC_TIMEBASE);
OPAL_CALL(opal_get_msg, OPAL_GET_MSG);
OPAL_CALL(opal_check_completion, OPAL_CHECK_ASYNC_COMPLETION);
OPAL_CALL(opal_sync_host_reboot, OPAL_SYNC_HOST_REBOOT);