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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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d050894435
This patch adds a cpuidle driver for systems based around the MIPS
Coherent Processing System (CPS) architecture. It supports four idle
states:
- The standard MIPS wait instruction.
- The non-coherent wait, clock gated & power gated states exposed by
the recently added pm-cps layer.
The pm-cps layer is used to enter all the deep idle states. Since cores
in the clock or power gated states cannot service interrupts, the
gic_send_ipi_single function is modified to send a power up command for
the appropriate core to the CPC in cases where the target CPU has marked
itself potentially incoherent.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
/*
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* Copyright (C) 2013 Imagination Technologies
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* Author: Paul Burton <paul.burton@imgtec.com>
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*
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* Based on smp-cmp.c:
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* Copyright (C) 2007 MIPS Technologies, Inc.
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* Author: Chris Dearman (chris@mips.com)
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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 of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/printk.h>
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#include <asm/gic.h>
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#include <asm/mips-cpc.h>
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#include <asm/smp-ops.h>
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void gic_send_ipi_single(int cpu, unsigned int action)
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{
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unsigned long flags;
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unsigned int intr;
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unsigned int core = cpu_data[cpu].core;
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pr_debug("CPU%d: %s cpu %d action %u status %08x\n",
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smp_processor_id(), __func__, cpu, action, read_c0_status());
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local_irq_save(flags);
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switch (action) {
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case SMP_CALL_FUNCTION:
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intr = plat_ipi_call_int_xlate(cpu);
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break;
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case SMP_RESCHEDULE_YOURSELF:
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intr = plat_ipi_resched_int_xlate(cpu);
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break;
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default:
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BUG();
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}
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gic_send_ipi(intr);
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if (mips_cpc_present() && (core != current_cpu_data.core)) {
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while (!cpumask_test_cpu(cpu, &cpu_coherent_mask)) {
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mips_cpc_lock_other(core);
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write_cpc_co_cmd(CPC_Cx_CMD_PWRUP);
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mips_cpc_unlock_other();
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}
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}
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local_irq_restore(flags);
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}
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void gic_send_ipi_mask(const struct cpumask *mask, unsigned int action)
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{
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unsigned int i;
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for_each_cpu(i, mask)
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gic_send_ipi_single(i, action);
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}
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