From: Guo Ren <ren_guo@c-sky.com>
To: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
tglx@linutronix.de, daniel.lezcano@linaro.org,
jason@lakedaemon.net, arnd@arndb.de, devicetree@vger.kernel.org,
andrea.parri@amarulasolutions.com, peterz@infradead.org
Cc: c-sky_gcc_upstream@c-sky.com, gnu-csky@mentor.com,
thomas.petazzoni@bootlin.com, wbx@uclibc-ng.org,
ren_guo@c-sky.com, green.hu@gmail.com
Subject: [PATCH V3 16/27] csky: SMP support
Date: Wed, 12 Sep 2018 21:24:50 +0800 [thread overview]
Message-ID: <dfc5dbddc7b5f47f0f39712423f5a635938a873a.1536757532.git.ren_guo@c-sky.com> (raw)
In-Reply-To: <cover.1536757532.git.ren_guo@c-sky.com>
In-Reply-To: <cover.1536757532.git.ren_guo@c-sky.com>
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
---
arch/csky/include/asm/smp.h | 26 +++++
arch/csky/kernel/smp.c | 234 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 260 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..9a53abf
--- /dev/null
+++ b/arch/csky/include/asm/smp.h
@@ -0,0 +1,26 @@
+#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 __init enable_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 unsigned long *, unsigned long));
+
+#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..522c73f
--- /dev/null
+++ b/arch/csky/kernel/smp.c
@@ -0,0 +1,234 @@
+#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>
+
+#define IPI_IRQ 15
+
+static struct {
+ unsigned long bits ____cacheline_aligned;
+} ipi_data[NR_CPUS] __cacheline_aligned;
+
+enum ipi_message_type {
+ IPI_EMPTY,
+ IPI_RESCHEDULE,
+ IPI_CALL_FUNC,
+ IPI_MAX
+};
+
+static irqreturn_t handle_ipi(int irq, void *dev)
+{
+ unsigned long *pending_ipis = &ipi_data[smp_processor_id()].bits;
+
+ while (true) {
+ unsigned long ops;
+
+ ops = xchg(pending_ipis, 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 unsigned long *mask, unsigned long irq) = NULL;
+
+void __init set_send_ipi(void (*func)(const unsigned long *, unsigned long))
+{
+ if (send_arch_ipi)
+ return;
+
+ send_arch_ipi = func;
+}
+
+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, &ipi_data[i].bits);
+
+ smp_mb();
+ send_arch_ipi(cpumask_bits(to_whom), IPI_IRQ);
+}
+
+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 *__cpu_up_stack_pointer[NR_CPUS];
+void *__cpu_up_task_pointer[NR_CPUS];
+
+void __init smp_prepare_boot_cpu(void)
+{
+}
+
+void __init smp_prepare_cpus(unsigned int max_cpus)
+{
+}
+
+static int ipi_dummy_dev;
+
+void __init enable_smp_ipi(void)
+{
+ enable_percpu_irq(IPI_IRQ, 0);
+}
+
+void __init setup_smp_ipi(void)
+{
+ int rc;
+
+ irq_create_mapping(NULL, IPI_IRQ);
+
+ 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");
+
+ /* Flush dcache */
+ 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
next prev parent reply other threads:[~2018-09-12 13:27 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-12 13:24 [PATCH V4 00/27] C-SKY(csky) Linux Kernel Port Guo Ren
2018-09-12 13:24 ` [PATCH V3 01/27] csky: Build infrastructure Guo Ren
2018-09-12 13:24 ` [PATCH V3 02/27] csky: defconfig Guo Ren
2018-09-12 13:24 ` [PATCH V3 03/27] csky: Kernel booting Guo Ren
2018-09-12 13:24 ` [PATCH V3 04/27] csky: Exception handling Guo Ren
2018-09-12 13:24 ` [PATCH V3 05/27] csky: System Call Guo Ren
2018-09-12 13:24 ` [PATCH V3 06/27] csky: Cache and TLB routines Guo Ren
2018-09-12 13:24 ` [PATCH V3 07/27] csky: MMU and page table management Guo Ren
2018-09-12 13:24 ` [PATCH V3 08/27] csky: Process management and Signal Guo Ren
2018-09-12 13:24 ` [PATCH V3 09/27] csky: VDSO and rt_sigreturn Guo Ren
2018-09-12 13:24 ` [PATCH V3 10/27] csky: IRQ handling Guo Ren
2018-09-12 13:24 ` [PATCH V3 12/27] csky: ELF and module probe Guo Ren
2018-09-12 13:24 ` [PATCH V3 13/27] csky: Library functions Guo Ren
2018-09-12 13:24 ` [PATCH V3 14/27] csky: User access Guo Ren
2018-09-12 13:24 ` [PATCH V3 15/27] csky: Debug and Ptrace GDB Guo Ren
2018-09-12 13:24 ` Guo Ren [this message]
2018-09-12 13:24 ` [PATCH V3 18/27] dt-bindings: csky CPU Bindings Guo Ren
2018-09-12 13:24 ` [PATCH V3 19/27] dt-bindings: timer: gx6605s SOC timer Guo Ren
2018-09-12 13:24 ` [PATCH V3 20/27] dt-bindings: timer: C-SKY Multi-processor timer Guo Ren
2018-09-12 13:24 ` [PATCH V3 22/27] dt-bindings: interrupt-controller: C-SKY SMP intc Guo Ren
2018-09-12 13:24 ` [PATCH V3 23/27] clocksource: add gx6605s SOC system timer Guo Ren
[not found] ` <abb46d366b513b814f7af234d560306a818b7324.1536757532.git.ren_guo@c-sky.com>
2018-09-12 14:22 ` [PATCH V3 17/27] csky: Misc headers Arnd Bergmann
2018-09-12 14:30 ` [PATCH V4 00/27] C-SKY(csky) Linux Kernel Port Arnd Bergmann
2018-09-14 14:37 ` Guo Ren
2018-09-14 14:46 ` Arnd Bergmann
2018-09-14 16:02 ` Guo Ren
2018-09-14 16:09 ` Arnd Bergmann
2018-09-14 23:28 ` Guo Ren
2018-09-20 17:52 ` Palmer Dabbelt
2018-09-21 5:18 ` Arnd Bergmann
2018-09-21 23:48 ` Guo Ren
2018-09-24 7:21 ` Geert Uytterhoeven
2018-09-24 8:47 ` Arnd Bergmann
2018-09-16 1:07 ` Guo Ren
2018-09-16 4:53 ` Guo Ren
2018-09-17 11:54 ` Stephen Rothwell
2018-09-17 12:03 ` Stephen Rothwell
2018-09-17 14:50 ` Guo Ren
2018-09-17 14:37 ` Guo Ren
[not found] ` <93e8b592e429c156ad4d4ca5d85ef48fd0ab8b70.1536757532.git.ren_guo@c-sky.com>
2018-09-12 15:55 ` [PATCH V3 11/27] csky: Atomic operations Peter Zijlstra
2018-09-15 14:55 ` Guo Ren
2018-09-17 8:17 ` Peter Zijlstra
2018-09-17 15:05 ` Guo Ren
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