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ARC: [plat-eznps] new command line argument for HW scheduler at MTM

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We add ability for all cores at NPS SoC to control the number of cycles
HW thread can execute before it is replace with another eligible
HW thread within the same core. The replacement is done by the
HW scheduler.

Signed-off-by: Noam Camus <[email protected]>
Signed-off-by: Vineet Gupta <[email protected]>
[vgupta: simplified handlign of out of range argument value]
This commit is contained in:
Noam Camus 2017-06-15 11:43:57 +03:00 • committed by Vineet Gupta
commit 35b55ef2b8
2 changed files with 34 additions and 2 deletions
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27
arch/arc/plat-eznps/mtm.c
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@ -21,10 +21,13 @@
#include <plat/mtm.h>
#include <plat/smp.h>
#define MT_CTRL_HS_CNT 0xFF
#define MT_HS_CNT_MIN 0x01
#define MT_HS_CNT_MAX 0xFF
#define MT_CTRL_ST_CNT 0xF
#define NPS_NUM_HW_THREADS 0x10
static int mtm_hs_ctr = MT_HS_CNT_MAX;
#ifdef CONFIG_EZNPS_MEM_ERROR_ALIGN
int do_memory_error(unsigned long address, struct pt_regs *regs)
{
@ -127,7 +130,7 @@ void mtm_enable_core(unsigned int cpu)
/* Enable HW schedule, stall counter, mtm */
mt_ctrl.value = 0;
mt_ctrl.hsen = 1;
mt_ctrl.hs_cnt = MT_CTRL_HS_CNT;
mt_ctrl.hs_cnt = mtm_hs_ctr;
mt_ctrl.mten = 1;
write_aux_reg(CTOP_AUX_MT_CTRL, mt_ctrl.value);
@ -138,3 +141,23 @@ void mtm_enable_core(unsigned int cpu)
*/
cpu_relax();
}
/* Verify and set the value of the mtm hs counter */
static int __init set_mtm_hs_ctr(char *ctr_str)
{
long hs_ctr;
int ret;
ret = kstrtol(ctr_str, 0, &hs_ctr);
if (ret || hs_ctr > MT_HS_CNT_MAX || hs_ctr < MT_HS_CNT_MIN) {
pr_err("** Invalid @nps_mtm_hs_ctr [%d] needs to be [%d:%d] (incl)\n",
hs_ctr, MT_HS_CNT_MIN, MT_HS_CNT_MAX);
return -EINVAL;
}
mtm_hs_ctr = hs_ctr;
return 0;
}
early_param("nps_mtm_hs_ctr", set_mtm_hs_ctr);