openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

ARC: [plat-eznps] use schd.wft instruction instead of sleep at idle task 

When HW threads are active we want CPU to enter idle state only
for the calling HW thread and not to put on sleep all HW threads
sharing this core. For this need the NPS400 got dedicated instruction
so only calling thread is entring sleep and all other are still awake
and can execute instructions.

Signed-off-by: Noam Camus <noamca@mellanox.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
[vgupta: reworked patch to not use inline ifdef but a new function itself]
This commit is contained in:
Noam Camus 2017-05-28 09:52:06 +03:00 committed by Vineet Gupta
parent 64f42cec84
commit 644fa02b39
2 changed files with 13 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
arch/arc/kernel/process.c
View File

@ -92,7 +92,18 @@ void arch_cpu_idle(void)
:"I"(arg)); /* can't be "r" has to be embedded const */
}
#else
#elif defined(CONFIG_EZNPS_MTM_EXT) /* ARC700 variant in NPS */
void arch_cpu_idle(void)
{
/* only the calling HW thread needs to sleep */
__asm__ __volatile__(
".word %0 \n"
:
:"i"(CTOP_INST_HWSCHD_WFT_IE12));
}
#else /* ARC700 */
void arch_cpu_idle(void)
{

1
arch/arc/plat-eznps/include/plat/ctop.h
View File

@ -46,6 +46,7 @@
#define CTOP_AUX_UDMC (CTOP_AUX_BASE + 0x300)
/* EZchip core instructions */
#define CTOP_INST_HWSCHD_WFT_IE12 0x3E6F7344
#define CTOP_INST_HWSCHD_OFF_R4 0x3C6F00BF
#define CTOP_INST_HWSCHD_RESTORE_R4 0x3E6F7103
#define CTOP_INST_SCHD_RW 0x3E6F7004