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From: Guo Ren <ren_guo@c-sky.com>
To: akpm@linux-foundation.org, arnd@arndb.de,
	daniel.lezcano@linaro.org, davem@davemloft.net,
	gregkh@linuxfoundation.org, hch@infradead.org,
	marc.zyngier@arm.com, mark.rutland@arm.com, peterz@infradead.org,
	robh@kernel.org, tglx@linutronix.de
Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
	devicetree@vger.kernel.org, robh+dt@kernel.org,
	c-sky_gcc_upstream@c-sky.com, Guo Ren <ren_guo@c-sky.com>
Subject: [PATCH V9 16/21] csky: SMP support
Date: Tue, 16 Oct 2018 10:58:35 +0800	[thread overview]
Message-ID: <4fca35ebfae9208ed6117bbe41c863a33730681e.1539655732.git.ren_guo@c-sky.com> (raw)
In-Reply-To: <cover.1539655731.git.ren_guo@c-sky.com>
In-Reply-To: <cover.1539655731.git.ren_guo@c-sky.com>

This patch adds boot, ipi, hotplug codes for SMP.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnd Bergmann <arnd@arndb.de>
---
Changelog:
 - Use PER_CPU_DEFINE for ipi_data.
 - Remove unused variable and add static for enable_smp_ipi().
 - Add comment to explain pass args from primary CPU to secondary CPU.
 - Remove set_ipi_irq_mapping callback.
 - Convert the cpumask to an interrupt-controller specific representation
   in driver's code, and not the SMP code's.
 - csky: remove irq_mapping from smp.c
   There are some feedbacks from irqchip, and we need to adjust
   "smp.c & smp.h" to match the csky_mp_intc modification.
 - Move IPI_IRQ define into drivers/irqchip/csky_mpintc.c, because it's a
   interrupt controller specific.
 - Bugfix request_irq with IPI_IRQ, we must use irq_mapping return value
   not directly use IPI_IRQ. The modification also involves csky_mp_intc.
---
---
 arch/csky/include/asm/smp.h |  26 +++++
 arch/csky/kernel/smp.c      | 237 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 263 insertions(+)
 create mode 100644 arch/csky/include/asm/smp.h
 create mode 100644 arch/csky/kernel/smp.c

diff --git a/arch/csky/include/asm/smp.h b/arch/csky/include/asm/smp.h
new file mode 100644
index 0000000..4a929c4
--- /dev/null
+++ b/arch/csky/include/asm/smp.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ASM_CSKY_SMP_H
+#define __ASM_CSKY_SMP_H
+
+#include <linux/cpumask.h>
+#include <linux/irqreturn.h>
+#include <linux/threads.h>
+
+#ifdef CONFIG_SMP
+
+void __init setup_smp(void);
+
+void __init setup_smp_ipi(void);
+
+void arch_send_call_function_ipi_mask(struct cpumask *mask);
+
+void arch_send_call_function_single_ipi(int cpu);
+
+void __init set_send_ipi(void (*func)(const struct cpumask *mask), int irq);
+
+#define raw_smp_processor_id()	(current_thread_info()->cpu)
+
+#endif /* CONFIG_SMP */
+
+#endif /* __ASM_CSKY_SMP_H */
diff --git a/arch/csky/kernel/smp.c b/arch/csky/kernel/smp.c
new file mode 100644
index 0000000..36ebaf9
--- /dev/null
+++ b/arch/csky/kernel/smp.c
@@ -0,0 +1,237 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/kernel_stat.h>
+#include <linux/notifier.h>
+#include <linux/cpu.h>
+#include <linux/percpu.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/of.h>
+#include <linux/sched/task_stack.h>
+#include <linux/sched/mm.h>
+#include <asm/irq.h>
+#include <asm/traps.h>
+#include <asm/sections.h>
+#include <asm/mmu_context.h>
+#include <asm/pgalloc.h>
+
+struct ipi_data_struct {
+	unsigned long bits ____cacheline_aligned;
+};
+static DEFINE_PER_CPU(struct ipi_data_struct, ipi_data);
+
+enum ipi_message_type {
+	IPI_EMPTY,
+	IPI_RESCHEDULE,
+	IPI_CALL_FUNC,
+	IPI_MAX
+};
+
+static irqreturn_t handle_ipi(int irq, void *dev)
+{
+	while (true) {
+		unsigned long ops;
+
+		ops = xchg(&this_cpu_ptr(&ipi_data)->bits, 0);
+		if (ops == 0)
+			return IRQ_HANDLED;
+
+		if (ops & (1 << IPI_RESCHEDULE))
+			scheduler_ipi();
+
+		if (ops & (1 << IPI_CALL_FUNC))
+			generic_smp_call_function_interrupt();
+
+		BUG_ON((ops >> IPI_MAX) != 0);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void (*send_arch_ipi)(const struct cpumask *mask);
+
+static int ipi_irq;
+void __init set_send_ipi(void (*func)(const struct cpumask *mask), int irq)
+{
+	if (send_arch_ipi)
+		return;
+
+	send_arch_ipi = func;
+	ipi_irq = irq;
+}
+
+static void
+send_ipi_message(const struct cpumask *to_whom, enum ipi_message_type operation)
+{
+	int i;
+
+	for_each_cpu(i, to_whom)
+		set_bit(operation, &per_cpu_ptr(&ipi_data, i)->bits);
+
+	smp_mb();
+	send_arch_ipi(to_whom);
+}
+
+void arch_send_call_function_ipi_mask(struct cpumask *mask)
+{
+	send_ipi_message(mask, IPI_CALL_FUNC);
+}
+
+void arch_send_call_function_single_ipi(int cpu)
+{
+	send_ipi_message(cpumask_of(cpu), IPI_CALL_FUNC);
+}
+
+static void ipi_stop(void *unused)
+{
+	while (1);
+}
+
+void smp_send_stop(void)
+{
+	on_each_cpu(ipi_stop, NULL, 1);
+}
+
+void smp_send_reschedule(int cpu)
+{
+	send_ipi_message(cpumask_of(cpu), IPI_RESCHEDULE);
+}
+
+void __init smp_prepare_boot_cpu(void)
+{
+}
+
+void __init smp_prepare_cpus(unsigned int max_cpus)
+{
+}
+
+static void __init enable_smp_ipi(void)
+{
+	enable_percpu_irq(ipi_irq, 0);
+}
+
+static int ipi_dummy_dev;
+void __init setup_smp_ipi(void)
+{
+	int rc;
+
+	if (ipi_irq == 0)
+		panic("%s IRQ mapping failed\n", __func__);
+
+	rc = request_percpu_irq(ipi_irq, handle_ipi, "IPI Interrupt",
+				&ipi_dummy_dev);
+	if (rc)
+		panic("%s IRQ request failed\n", __func__);
+
+	enable_smp_ipi();
+}
+
+void __init setup_smp(void)
+{
+	struct device_node *node = NULL;
+	int cpu;
+
+	while ((node = of_find_node_by_type(node, "cpu"))) {
+		if (!of_device_is_available(node))
+			continue;
+
+		if (of_property_read_u32(node, "reg", &cpu))
+			continue;
+
+		if (cpu >= NR_CPUS)
+			continue;
+
+		set_cpu_possible(cpu, true);
+		set_cpu_present(cpu, true);
+	}
+}
+
+extern void _start_smp_secondary(void);
+
+volatile unsigned int secondary_hint;
+volatile unsigned int secondary_ccr;
+volatile unsigned int secondary_stack;
+
+int __cpu_up(unsigned int cpu, struct task_struct *tidle)
+{
+	unsigned int tmp;
+
+	secondary_stack = (unsigned int)tidle->stack + THREAD_SIZE;
+
+	secondary_hint = mfcr("cr31");
+
+	secondary_ccr  = mfcr("cr18");
+
+	/*
+	 * Because other CPUs are in reset status, we must flush data
+	 * from cache to out and secondary CPUs use them in
+	 * csky_start_secondary(void)
+	 */
+	mtcr("cr17", 0x22);
+
+	/* Enable cpu in SMP reset ctrl reg */
+	tmp = mfcr("cr<29, 0>");
+	tmp |= 1 << cpu;
+	mtcr("cr<29, 0>", tmp);
+
+	/* Wait for the cpu online */
+	while (!cpu_online(cpu));
+
+	secondary_stack = 0;
+
+	return 0;
+}
+
+void __init smp_cpus_done(unsigned int max_cpus)
+{
+}
+
+int setup_profiling_timer(unsigned int multiplier)
+{
+	return -EINVAL;
+}
+
+void csky_start_secondary(void)
+{
+	struct mm_struct *mm = &init_mm;
+	unsigned int cpu = smp_processor_id();
+
+	mtcr("cr31", secondary_hint);
+	mtcr("cr18", secondary_ccr);
+
+	mtcr("vbr", vec_base);
+
+	flush_tlb_all();
+	write_mmu_pagemask(0);
+	TLBMISS_HANDLER_SETUP_PGD(swapper_pg_dir);
+	TLBMISS_HANDLER_SETUP_PGD_KERNEL(swapper_pg_dir);
+
+	asid_cache(smp_processor_id()) = ASID_FIRST_VERSION;
+
+#ifdef CONFIG_CPU_HAS_FPU
+	init_fpu();
+#endif
+
+	enable_smp_ipi();
+
+	mmget(mm);
+	mmgrab(mm);
+	current->active_mm = mm;
+	cpumask_set_cpu(cpu, mm_cpumask(mm));
+
+	notify_cpu_starting(cpu);
+	set_cpu_online(cpu, true);
+
+	pr_info("CPU%u Online: %s...\n", cpu, __func__);
+
+	local_irq_enable();
+	preempt_disable();
+	cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
+}
-- 
2.7.4


  parent reply	other threads:[~2018-10-16  3:10 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-16  2:58 [PATCH V9 00/21] C-SKY(csky) Linux Kernel Port Guo Ren
2018-10-16  2:58 ` [PATCH V9 01/21] csky: Build infrastructure Guo Ren
2018-10-23  0:08   ` Guo Ren
2018-10-24 22:53     ` Arnd Bergmann
2018-10-25 17:04       ` Guo Ren
2018-10-16  2:58 ` [PATCH V9 02/21] csky: defconfig Guo Ren
2018-10-17 14:56   ` Arnd Bergmann
2018-10-16  2:58 ` [PATCH V9 03/21] csky: Kernel booting Guo Ren
2018-10-17 14:58   ` Arnd Bergmann
2018-10-16  2:58 ` [PATCH V9 04/21] csky: Exception handling and mm-fault Guo Ren
2018-10-17 14:59   ` Arnd Bergmann
2018-10-16  2:58 ` [PATCH V9 05/21] csky: System Call Guo Ren
2018-10-17 15:02   ` Arnd Bergmann
2018-10-18  2:02     ` Guo Ren
2018-10-16  2:58 ` [PATCH V9 06/21] csky: Cache and TLB routines Guo Ren
2018-10-17 15:08   ` Arnd Bergmann
2018-10-16  2:58 ` [PATCH V9 07/21] csky: MMU and page table management Guo Ren
2018-10-17 15:06   ` Arnd Bergmann
2018-10-18  2:05     ` Guo Ren
2018-10-16  2:58 ` [PATCH V9 08/21] csky: Process management and Signal Guo Ren
2018-10-17 15:11   ` Arnd Bergmann
2018-10-18  2:37     ` Guo Ren
2018-10-16  2:58 ` [PATCH V9 09/21] csky: VDSO and rt_sigreturn Guo Ren
2018-10-17 15:13   ` Arnd Bergmann
2018-10-16  2:58 ` [PATCH V9 10/21] csky: IRQ handling Guo Ren
2018-10-17 15:14   ` Arnd Bergmann
2018-10-18  2:39     ` Guo Ren
2018-10-16  2:58 ` [PATCH V9 11/21] csky: Atomic operations Guo Ren
2018-10-17 15:17   ` Arnd Bergmann
2018-10-18  2:40     ` Guo Ren
2018-10-21 20:55   ` Peter Zijlstra
2018-10-22  1:52     ` Guo Ren
2018-10-16  2:58 ` [PATCH V9 12/21] csky: ELF and module probe Guo Ren
2018-10-17 15:18   ` Arnd Bergmann
2018-10-18  2:49     ` Guo Ren
2018-10-18  8:31       ` Arnd Bergmann
2018-10-16  2:58 ` [PATCH V9 13/21] csky: Library functions Guo Ren
2018-10-17 15:24   ` Arnd Bergmann
2018-10-18  3:10     ` Guo Ren
2018-10-16  2:58 ` [PATCH V9 14/21] csky: User access Guo Ren
2018-10-17 15:37   ` Arnd Bergmann
2018-10-16  2:58 ` [PATCH V9 15/21] csky: Debug and Ptrace GDB Guo Ren
2018-10-17 15:46   ` Arnd Bergmann
2018-10-18  3:17     ` Guo Ren
2018-10-16  2:58 ` Guo Ren [this message]
2018-10-17 15:47   ` [PATCH V9 16/21] csky: SMP support Arnd Bergmann
2018-10-16  2:58 ` [PATCH V9 17/21] csky: Misc headers Guo Ren
2018-10-17 15:49   ` Arnd Bergmann
2018-10-16  2:58 ` [PATCH V9 18/21] dt-bindings: csky CPU Bindings Guo Ren
2018-10-17 15:50   ` Arnd Bergmann
2018-10-18  3:21     ` Guo Ren
2018-10-18  3:45       ` Guo Ren
2018-10-18 14:31   ` Rob Herring
2018-10-19  2:19     ` Guo Ren
2018-10-16  2:58 ` [PATCH V9 19/21] dt-bindings: Add vendor prefix for csky Guo Ren
2018-10-16  2:58 ` [PATCH V9 20/21] MAINTAINERS: Add csky Guo Ren
2018-10-17 15:51   ` Arnd Bergmann
2018-10-16  5:48 ` [PATCH V9 21/21] csky: support dword access for get_user_size() Guo Ren
2018-10-17 15:44   ` Arnd Bergmann
2018-10-18  3:41     ` Guo Ren
2018-10-18  8:34       ` Arnd Bergmann
2018-10-18  8:57         ` Guo Ren
2018-10-24  7:17           ` Arnd Bergmann
2018-10-25 17:08             ` Guo Ren
2018-10-17 15:58 ` [PATCH V9 00/21] C-SKY(csky) Linux Kernel Port Arnd Bergmann
2018-10-18  4:10   ` Guo Ren
2018-10-18  8:36     ` Arnd Bergmann
2018-10-18  9:03       ` Guo Ren

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