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authorNoam Camus <noamca@mellanox.com>2017-06-15 11:43:57 +0300
committerVineet Gupta <vgupta@synopsys.com>2017-08-28 15:17:36 -0700
commit35b55ef2b8f5aeedf349a1fe2ad8b11d5974f3f1 (patch)
tree6035ef02686f915f2dbb2be9f8f86284b2173edd /arch/arc/plat-eznps
parentARC: set boot print log level to PR_INFO (diff)
downloadlinux-dev-35b55ef2b8f5aeedf349a1fe2ad8b11d5974f3f1.tar.xz
linux-dev-35b55ef2b8f5aeedf349a1fe2ad8b11d5974f3f1.zip
ARC: [plat-eznps] new command line argument for HW scheduler at MTM
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 <noamca@mellanox.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com> [vgupta: simplified handlign of out of range argument value]
Diffstat (limited to '')
-rw-r--r--arch/arc/plat-eznps/mtm.c27
1 files changed, 25 insertions, 2 deletions
diff --git a/arch/arc/plat-eznps/mtm.c b/arch/arc/plat-eznps/mtm.c
index dcbf8f6ebf74..8a13f0ac49fb 100644
--- a/arch/arc/plat-eznps/mtm.c
+++ b/arch/arc/plat-eznps/mtm.c
@@ -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);