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c3f134fb39
Commit18743d2781("irqchip: mips-gic: Stop using per-platform mapping tables") in v3.19-rc1 changed the routing of IPIs through the GIC to go to the HW0 IRQ pin along with the rest of the GIC interrupts, rather than to HW1 and HW2 pins. This breaks SMP boot using the CMP or MT SMP implementations because HW0 doesn't get unmasked when secondary CPUs are initialised so the IPIs will never interrupt secondary CPUs (nor any other interrupts routed through the GIC). Commitff1e29ade4("MIPS: smp-cps: Enable all hardware interrupts on secondary CPUs") fixed this in advance for the CPS SMP implementation by unmasking all hardware interrupt lines for secondary CPUs, so lets do the same for the CMP and MT implementations. Fixes:18743d2781("irqchip: mips-gic: Stop using per-platform mapping tables") Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Andrew Bresticker <abrestic@chromium.org> Cc: Qais Yousef <qais.yousef@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/9025/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
160 lines
4.1 KiB
C
160 lines
4.1 KiB
C
/*
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* This program is free software; you can distribute it and/or modify it
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* under the terms of the GNU General Public License (Version 2) as
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* 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
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* Copyright (C) 2007 MIPS Technologies, Inc.
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* Chris Dearman (chris@mips.com)
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*/
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#undef DEBUG
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/smp.h>
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#include <linux/cpumask.h>
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#include <linux/interrupt.h>
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#include <linux/compiler.h>
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#include <linux/irqchip/mips-gic.h>
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#include <linux/atomic.h>
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#include <asm/cacheflush.h>
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#include <asm/cpu.h>
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#include <asm/processor.h>
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#include <asm/hardirq.h>
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#include <asm/mmu_context.h>
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#include <asm/smp.h>
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#include <asm/time.h>
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#include <asm/mipsregs.h>
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#include <asm/mipsmtregs.h>
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#include <asm/mips_mt.h>
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#include <asm/amon.h>
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static void cmp_init_secondary(void)
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{
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struct cpuinfo_mips *c __maybe_unused = ¤t_cpu_data;
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/* Assume GIC is present */
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change_c0_status(ST0_IM, STATUSF_IP2 | STATUSF_IP3 | STATUSF_IP4 |
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STATUSF_IP5 | STATUSF_IP6 | STATUSF_IP7);
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/* Enable per-cpu interrupts: platform specific */
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#ifdef CONFIG_MIPS_MT_SMP
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if (cpu_has_mipsmt)
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c->vpe_id = (read_c0_tcbind() >> TCBIND_CURVPE_SHIFT) &
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TCBIND_CURVPE;
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#endif
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}
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static void cmp_smp_finish(void)
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{
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pr_debug("SMPCMP: CPU%d: %s\n", smp_processor_id(), __func__);
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/* CDFIXME: remove this? */
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write_c0_compare(read_c0_count() + (8 * mips_hpt_frequency / HZ));
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#ifdef CONFIG_MIPS_MT_FPAFF
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/* If we have an FPU, enroll ourselves in the FPU-full mask */
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if (cpu_has_fpu)
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cpu_set(smp_processor_id(), mt_fpu_cpumask);
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#endif /* CONFIG_MIPS_MT_FPAFF */
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local_irq_enable();
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}
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/*
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* Setup the PC, SP, and GP of a secondary processor and start it running
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* smp_bootstrap is the place to resume from
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* __KSTK_TOS(idle) is apparently the stack pointer
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* (unsigned long)idle->thread_info the gp
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*/
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static void cmp_boot_secondary(int cpu, struct task_struct *idle)
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{
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struct thread_info *gp = task_thread_info(idle);
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unsigned long sp = __KSTK_TOS(idle);
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unsigned long pc = (unsigned long)&smp_bootstrap;
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unsigned long a0 = 0;
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pr_debug("SMPCMP: CPU%d: %s cpu %d\n", smp_processor_id(),
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__func__, cpu);
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#if 0
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/* Needed? */
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flush_icache_range((unsigned long)gp,
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(unsigned long)(gp + sizeof(struct thread_info)));
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#endif
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amon_cpu_start(cpu, pc, sp, (unsigned long)gp, a0);
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}
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/*
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* Common setup before any secondaries are started
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*/
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void __init cmp_smp_setup(void)
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{
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int i;
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int ncpu = 0;
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pr_debug("SMPCMP: CPU%d: %s\n", smp_processor_id(), __func__);
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#ifdef CONFIG_MIPS_MT_FPAFF
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/* If we have an FPU, enroll ourselves in the FPU-full mask */
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if (cpu_has_fpu)
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cpu_set(0, mt_fpu_cpumask);
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#endif /* CONFIG_MIPS_MT_FPAFF */
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for (i = 1; i < NR_CPUS; i++) {
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if (amon_cpu_avail(i)) {
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set_cpu_possible(i, true);
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__cpu_number_map[i] = ++ncpu;
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__cpu_logical_map[ncpu] = i;
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}
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}
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if (cpu_has_mipsmt) {
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unsigned int nvpe = 1;
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#ifdef CONFIG_MIPS_MT_SMP
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unsigned int mvpconf0 = read_c0_mvpconf0();
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nvpe = ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1;
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#endif
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smp_num_siblings = nvpe;
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}
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pr_info("Detected %i available secondary CPU(s)\n", ncpu);
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}
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void __init cmp_prepare_cpus(unsigned int max_cpus)
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{
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pr_debug("SMPCMP: CPU%d: %s max_cpus=%d\n",
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smp_processor_id(), __func__, max_cpus);
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#ifdef CONFIG_MIPS_MT
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/*
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* FIXME: some of these options are per-system, some per-core and
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* some per-cpu
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*/
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mips_mt_set_cpuoptions();
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#endif
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}
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struct plat_smp_ops cmp_smp_ops = {
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.send_ipi_single = gic_send_ipi_single,
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.send_ipi_mask = gic_send_ipi_mask,
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.init_secondary = cmp_init_secondary,
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.smp_finish = cmp_smp_finish,
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.boot_secondary = cmp_boot_secondary,
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.smp_setup = cmp_smp_setup,
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.prepare_cpus = cmp_prepare_cpus,
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};
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