linux-kernel - [PATCH v3 07/11] ARC: [plat-eznps] new command line argument for HW scheduler at MTM

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Date:   Thu, 15 Jun 2017 11:43:57 +0300
From:   Noam Camus <noamca@...lanox.com>
To:     linux-snps-arc@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, Noam Camus <noamca@...lanox.com>
Subject: [PATCH v3 07/11] ARC: [plat-eznps] new command line argument for HW scheduler at MTM

From: Noam Camus <noamca@...lanox.com>

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@...lanox.com>
---
 Documentation/admin-guide/kernel-parameters.txt |    9 ++++
 arch/arc/plat-eznps/mtm.c                       |   46 ++++++++++++++++++++++-
 2 files changed, 53 insertions(+), 2 deletions(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 15f79c2..5b551f7 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2693,6 +2693,15 @@
 			If the dependencies are under your control, you can
 			turn on cpu0_hotplug.
 
+	nps_mtm_hs_ctr= [KNL,ARC]
+			This parameter sets the maximum duration, in
+			cycles, each HW thread of the CTOP can run
+			without interruptions, before HW switches it.
+			The actual maximum duration is 16 times this
+			parameter's value.
+			Format: integer between 1 and 255
+			Default: 255
+
 	nptcg=		[IA-64] Override max number of concurrent global TLB
 			purges which is reported from either PAL_VM_SUMMARY or
 			SAL PALO.
diff --git a/arch/arc/plat-eznps/mtm.c b/arch/arc/plat-eznps/mtm.c
index dcbf8f6..9c78ad6 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 +141,42 @@ void mtm_enable_core(unsigned int cpu)
 	 */
 	cpu_relax();
 }
+
+/* Handle an out of bounds mtm hs counter value */
+static void __init handle_mtm_hs_ctr_out_of_bounds_error(uint8_t val)
+{
+	pr_err("** The value must be in range [%d,%d] (inclusive)\n",
+		MT_HS_CNT_MIN, MT_HS_CNT_MAX);
+
+	mtm_hs_ctr = val;
+}
+
+/* Verify and set the value of the mtm hs counter */
+static int __init set_mtm_hs_ctr(char *ctr_str)
+{
+	int ret;
+	long hs_ctr;
+
+	ret = kstrtol(ctr_str, 0, &hs_ctr);
+	if (ret) {
+		pr_err("** Out of range mtm_hs_ctr, using default value %d\n",
+			MT_HS_CNT_MAX);
+		mtm_hs_ctr = MT_HS_CNT_MAX;
+		return -EINVAL;
+	}
+
+	if (hs_ctr > MT_HS_CNT_MAX) {
+		handle_mtm_hs_ctr_out_of_bounds_error(MT_HS_CNT_MAX);
+		return -EDOM;
+	}
+
+	if (hs_ctr < MT_HS_CNT_MIN) {
+		handle_mtm_hs_ctr_out_of_bounds_error(MT_HS_CNT_MIN);
+		return -EDOM;
+	}
+
+	mtm_hs_ctr = hs_ctr;
+
+	return 0;
+}
+early_param("nps_mtm_hs_ctr", set_mtm_hs_ctr);
-- 
1.7.1