![Elad Kanfi](/assets/img/avatar_default.png)
HW bug description: in case of HW thread context switch the dpc configuration of the exiting thread is dragged one cycle into the next thread. In order to avoid the consequences of this bug, the DPC register is set to an initial value, and not changed afterwards. Signed-off-by: Elad Kanfi <eladkan@mellanox.com> Signed-off-by: Noam Camus <noamca@mellanox.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
176 lines
4.3 KiB
C
176 lines
4.3 KiB
C
/*
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* Copyright(c) 2015 EZchip Technologies.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* The full GNU General Public License is included in this distribution in
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* the file called "COPYING".
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*/
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#include <linux/smp.h>
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#include <linux/io.h>
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#include <linux/log2.h>
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#include <asm/arcregs.h>
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#include <plat/mtm.h>
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#include <plat/smp.h>
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#define MT_HS_CNT_MIN 0x01
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#define MT_HS_CNT_MAX 0xFF
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#define MT_CTRL_ST_CNT 0xF
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#define NPS_NUM_HW_THREADS 0x10
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static int mtm_hs_ctr = MT_HS_CNT_MAX;
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#ifdef CONFIG_EZNPS_MEM_ERROR_ALIGN
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int do_memory_error(unsigned long address, struct pt_regs *regs)
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{
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die("Invalid Mem Access", regs, address);
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return 1;
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}
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#endif
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static void mtm_init_nat(int cpu)
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{
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struct nps_host_reg_mtm_cfg mtm_cfg;
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struct nps_host_reg_aux_udmc udmc;
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int log_nat, nat = 0, i, t;
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/* Iterate core threads and update nat */
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for (i = 0, t = cpu; i < NPS_NUM_HW_THREADS; i++, t++)
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nat += test_bit(t, cpumask_bits(cpu_possible_mask));
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log_nat = ilog2(nat);
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udmc.value = read_aux_reg(CTOP_AUX_UDMC);
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udmc.nat = log_nat;
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write_aux_reg(CTOP_AUX_UDMC, udmc.value);
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mtm_cfg.value = ioread32be(MTM_CFG(cpu));
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mtm_cfg.nat = log_nat;
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iowrite32be(mtm_cfg.value, MTM_CFG(cpu));
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}
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static void mtm_init_thread(int cpu)
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{
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int i, tries = 5;
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struct nps_host_reg_thr_init thr_init;
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struct nps_host_reg_thr_init_sts thr_init_sts;
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/* Set thread init register */
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thr_init.value = 0;
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iowrite32be(thr_init.value, MTM_THR_INIT(cpu));
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thr_init.thr_id = NPS_CPU_TO_THREAD_NUM(cpu);
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thr_init.str = 1;
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iowrite32be(thr_init.value, MTM_THR_INIT(cpu));
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/* Poll till thread init is done */
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for (i = 0; i < tries; i++) {
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thr_init_sts.value = ioread32be(MTM_THR_INIT_STS(cpu));
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if (thr_init_sts.thr_id == thr_init.thr_id) {
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if (thr_init_sts.bsy)
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continue;
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else if (thr_init_sts.err)
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pr_warn("Failed to thread init cpu %u\n", cpu);
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break;
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}
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pr_warn("Wrong thread id in thread init for cpu %u\n", cpu);
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break;
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}
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if (i == tries)
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pr_warn("Got thread init timeout for cpu %u\n", cpu);
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}
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int mtm_enable_thread(int cpu)
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{
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struct nps_host_reg_mtm_cfg mtm_cfg;
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if (NPS_CPU_TO_THREAD_NUM(cpu) == 0)
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return 1;
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/* Enable thread in mtm */
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mtm_cfg.value = ioread32be(MTM_CFG(cpu));
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mtm_cfg.ten |= (1 << (NPS_CPU_TO_THREAD_NUM(cpu)));
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iowrite32be(mtm_cfg.value, MTM_CFG(cpu));
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return 0;
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}
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void mtm_enable_core(unsigned int cpu)
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{
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int i;
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struct nps_host_reg_aux_mt_ctrl mt_ctrl;
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struct nps_host_reg_mtm_cfg mtm_cfg;
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struct nps_host_reg_aux_dpc dpc;
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/*
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* Initializing dpc register in each CPU.
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* Overwriting the init value of the DPC
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* register so that CMEM and FMT virtual address
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* spaces are accessible, and Data Plane HW
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* facilities are enabled.
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*/
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dpc.ien = 1;
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dpc.men = 1;
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write_aux_reg(CTOP_AUX_DPC, dpc.value);
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if (NPS_CPU_TO_THREAD_NUM(cpu) != 0)
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return;
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/* Initialize Number of Active Threads */
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mtm_init_nat(cpu);
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/* Initialize mtm_cfg */
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mtm_cfg.value = ioread32be(MTM_CFG(cpu));
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mtm_cfg.ten = 1;
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iowrite32be(mtm_cfg.value, MTM_CFG(cpu));
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/* Initialize all other threads in core */
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for (i = 1; i < NPS_NUM_HW_THREADS; i++)
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mtm_init_thread(cpu + i);
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/* Enable HW schedule, stall counter, mtm */
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mt_ctrl.value = 0;
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mt_ctrl.hsen = 1;
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mt_ctrl.hs_cnt = mtm_hs_ctr;
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mt_ctrl.mten = 1;
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write_aux_reg(CTOP_AUX_MT_CTRL, mt_ctrl.value);
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/*
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* HW scheduling mechanism will start working
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* Only after call to instruction "schd.rw".
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* cpu_relax() calls "schd.rw" instruction.
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*/
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cpu_relax();
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}
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/* Verify and set the value of the mtm hs counter */
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static int __init set_mtm_hs_ctr(char *ctr_str)
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{
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long hs_ctr;
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int ret;
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ret = kstrtol(ctr_str, 0, &hs_ctr);
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if (ret || hs_ctr > MT_HS_CNT_MAX || hs_ctr < MT_HS_CNT_MIN) {
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pr_err("** Invalid @nps_mtm_hs_ctr [%d] needs to be [%d:%d] (incl)\n",
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hs_ctr, MT_HS_CNT_MIN, MT_HS_CNT_MAX);
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return -EINVAL;
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}
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mtm_hs_ctr = hs_ctr;
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return 0;
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}
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early_param("nps_mtm_hs_ctr", set_mtm_hs_ctr);
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