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authorHuacai Chen <chenhc@lemote.com>2014-03-21 18:44:08 +0800
committerRalf Baechle <ralf@linux-mips.org>2014-03-31 18:17:12 +0200
commit300459d558725cdada5ddebbe52c24ef6e1853d3 (patch)
treefb93b1d6c2845af29cce7c06ae35a3b88b7f6431 /arch/mips/loongson
parent0e476d91244ec6a9f6be3eb1963627340d031f99 (diff)
downloadlinux-300459d558725cdada5ddebbe52c24ef6e1853d3.tar.gz
MIPS: Loongson 3: Add Loongson-3 SMP support
IPI registers of Loongson-3 include IPI_SET, IPI_CLEAR, IPI_STATUS, IPI_EN and IPI_MAILBOX_BUF. Each bit of IPI_STATUS indicate a type of IPI and IPI_EN indicate whether the IPI is enabled. The sender write 1 to IPI_SET bits generate IPIs in IPI_STATUS, and receiver write 1 to bits of IPI_CLEAR to clear IPIs. IPI_MAILBOX_BUF are used to deliver more information about IPIs. Why we change code in arch/mips/loongson/common/setup.c? If without this change, when SMP configured, system cannot boot since it hang at printk() in cgroup_init_early(). The root cause is: console_trylock() \-->down_trylock(&console_sem) \-->raw_spin_unlock_irqrestore(&sem->lock, flags) \-->_raw_spin_unlock_irqrestore()(SMP/UP have different versions) \-->__raw_spin_unlock_irqrestore() (following is the SMP case) \-->do_raw_spin_unlock() \-->arch_spin_unlock() \-->nudge_writes() \-->mb() \-->wbflush() \-->__wbflush() In previous code __wbflush() is initialized in plat_mem_setup(), but cgroup_init_early() is called before plat_mem_setup(). Therefore, In this patch we make changes to avoid boot failure. Signed-off-by: Huacai Chen <chenhc@lemote.com> Signed-off-by: Hongliang Tao <taohl@lemote.com> Signed-off-by: Hua Yan <yanh@lemote.com> Tested-by: Alex Smith <alex.smith@imgtec.com> Reviewed-by: Alex Smith <alex.smith@imgtec.com> Cc: John Crispin <john@phrozen.org> Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: Aurelien Jarno <aurelien@aurel32.net> Cc: linux-mips@linux-mips.org Cc: Fuxin Zhang <zhangfx@lemote.com> Cc: Zhangjin Wu <wuzhangjin@gmail.com> Patchwork: https://patchwork.linux-mips.org/patch/6638 Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/loongson')
-rw-r--r--arch/mips/loongson/common/init.c2
-rw-r--r--arch/mips/loongson/common/setup.c8
-rw-r--r--arch/mips/loongson/loongson-3/Makefile2
-rw-r--r--arch/mips/loongson/loongson-3/irq.c20
-rw-r--r--arch/mips/loongson/loongson-3/smp.c267
-rw-r--r--arch/mips/loongson/loongson-3/smp.h29
6 files changed, 323 insertions, 5 deletions
diff --git a/arch/mips/loongson/common/init.c b/arch/mips/loongson/common/init.c
index 81ba3b4a8f3..f37fe5413b7 100644
--- a/arch/mips/loongson/common/init.c
+++ b/arch/mips/loongson/common/init.c
@@ -9,6 +9,7 @@
*/
#include <linux/bootmem.h>
+#include <asm/smp-ops.h>
#include <loongson.h>
@@ -33,6 +34,7 @@ void __init prom_init(void)
/*init the uart base address */
prom_init_uart_base();
+ register_smp_ops(&loongson3_smp_ops);
}
void __init prom_free_prom_memory(void)
diff --git a/arch/mips/loongson/common/setup.c b/arch/mips/loongson/common/setup.c
index 8223f8acfd5..bb4ac922e47 100644
--- a/arch/mips/loongson/common/setup.c
+++ b/arch/mips/loongson/common/setup.c
@@ -18,9 +18,6 @@
#include <linux/screen_info.h>
#endif
-void (*__wbflush)(void);
-EXPORT_SYMBOL(__wbflush);
-
static void wbflush_loongson(void)
{
asm(".set\tpush\n\t"
@@ -32,10 +29,11 @@ static void wbflush_loongson(void)
".set mips0\n\t");
}
+void (*__wbflush)(void) = wbflush_loongson;
+EXPORT_SYMBOL(__wbflush);
+
void __init plat_mem_setup(void)
{
- __wbflush = wbflush_loongson;
-
#ifdef CONFIG_VT
#if defined(CONFIG_VGA_CONSOLE)
conswitchp = &vga_con;
diff --git a/arch/mips/loongson/loongson-3/Makefile b/arch/mips/loongson/loongson-3/Makefile
index b9968cd1602..70152b252dd 100644
--- a/arch/mips/loongson/loongson-3/Makefile
+++ b/arch/mips/loongson/loongson-3/Makefile
@@ -2,3 +2,5 @@
# Makefile for Loongson-3 family machines
#
obj-y += irq.o
+
+obj-$(CONFIG_SMP) += smp.o
diff --git a/arch/mips/loongson/loongson-3/irq.c b/arch/mips/loongson/loongson-3/irq.c
index b2dc62b97a0..088fd5e4fd6 100644
--- a/arch/mips/loongson/loongson-3/irq.c
+++ b/arch/mips/loongson/loongson-3/irq.c
@@ -26,6 +26,10 @@ void mach_irq_dispatch(unsigned int pending)
{
if (pending & CAUSEF_IP7)
do_IRQ(LOONGSON_TIMER_IRQ);
+#if defined(CONFIG_SMP)
+ else if (pending & CAUSEF_IP6)
+ loongson3_ipi_interrupt(NULL);
+#endif
else if (pending & CAUSEF_IP3)
ht_irqdispatch();
else if (pending & CAUSEF_IP2)
@@ -45,10 +49,26 @@ static inline void mask_loongson_irq(struct irq_data *d)
{
clear_c0_status(0x100 << (d->irq - MIPS_CPU_IRQ_BASE));
irq_disable_hazard();
+
+ /* Workaround: UART IRQ may deliver to any core */
+ if (d->irq == LOONGSON_UART_IRQ) {
+ int cpu = smp_processor_id();
+
+ LOONGSON_INT_ROUTER_INTENCLR = 1 << 10;
+ LOONGSON_INT_ROUTER_LPC = 0x10 + (1<<cpu);
+ }
}
static inline void unmask_loongson_irq(struct irq_data *d)
{
+ /* Workaround: UART IRQ may deliver to any core */
+ if (d->irq == LOONGSON_UART_IRQ) {
+ int cpu = smp_processor_id();
+
+ LOONGSON_INT_ROUTER_INTENSET = 1 << 10;
+ LOONGSON_INT_ROUTER_LPC = 0x10 + (1<<cpu);
+ }
+
set_c0_status(0x100 << (d->irq - MIPS_CPU_IRQ_BASE));
irq_enable_hazard();
}
diff --git a/arch/mips/loongson/loongson-3/smp.c b/arch/mips/loongson/loongson-3/smp.c
new file mode 100644
index 00000000000..93483c25b4b
--- /dev/null
+++ b/arch/mips/loongson/loongson-3/smp.c
@@ -0,0 +1,267 @@
+/*
+ * Copyright (C) 2010, 2011, 2012, Lemote, Inc.
+ * Author: Chen Huacai, chenhc@lemote.com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/cpu.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/cpufreq.h>
+#include <asm/processor.h>
+#include <asm/time.h>
+#include <asm/clock.h>
+#include <asm/tlbflush.h>
+#include <loongson.h>
+
+#include "smp.h"
+
+/* read a 32bit value from ipi register */
+#define loongson3_ipi_read32(addr) readl(addr)
+/* read a 64bit value from ipi register */
+#define loongson3_ipi_read64(addr) readq(addr)
+/* write a 32bit value to ipi register */
+#define loongson3_ipi_write32(action, addr) \
+ do { \
+ writel(action, addr); \
+ __wbflush(); \
+ } while (0)
+/* write a 64bit value to ipi register */
+#define loongson3_ipi_write64(action, addr) \
+ do { \
+ writeq(action, addr); \
+ __wbflush(); \
+ } while (0)
+
+static void *ipi_set0_regs[] = {
+ (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + SET0),
+ (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + SET0),
+ (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + SET0),
+ (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + SET0),
+ (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + SET0),
+ (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + SET0),
+ (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + SET0),
+ (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + SET0),
+ (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + SET0),
+ (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + SET0),
+ (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + SET0),
+ (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + SET0),
+ (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + SET0),
+ (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + SET0),
+ (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + SET0),
+ (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + SET0),
+};
+
+static void *ipi_clear0_regs[] = {
+ (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + CLEAR0),
+ (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + CLEAR0),
+ (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + CLEAR0),
+ (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + CLEAR0),
+ (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + CLEAR0),
+ (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + CLEAR0),
+ (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + CLEAR0),
+ (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + CLEAR0),
+ (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + CLEAR0),
+ (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + CLEAR0),
+ (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + CLEAR0),
+ (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + CLEAR0),
+ (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + CLEAR0),
+ (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + CLEAR0),
+ (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + CLEAR0),
+ (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + CLEAR0),
+};
+
+static void *ipi_status0_regs[] = {
+ (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + STATUS0),
+ (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + STATUS0),
+ (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + STATUS0),
+ (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + STATUS0),
+ (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + STATUS0),
+ (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + STATUS0),
+ (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + STATUS0),
+ (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + STATUS0),
+ (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + STATUS0),
+ (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + STATUS0),
+ (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + STATUS0),
+ (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + STATUS0),
+ (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + STATUS0),
+ (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + STATUS0),
+ (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + STATUS0),
+ (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + STATUS0),
+};
+
+static void *ipi_en0_regs[] = {
+ (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + EN0),
+ (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + EN0),
+ (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + EN0),
+ (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + EN0),
+ (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + EN0),
+ (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + EN0),
+ (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + EN0),
+ (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + EN0),
+ (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + EN0),
+ (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + EN0),
+ (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + EN0),
+ (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + EN0),
+ (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + EN0),
+ (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + EN0),
+ (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + EN0),
+ (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + EN0),
+};
+
+static void *ipi_mailbox_buf[] = {
+ (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + BUF),
+ (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + BUF),
+ (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + BUF),
+ (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + BUF),
+ (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + BUF),
+ (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + BUF),
+ (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + BUF),
+ (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + BUF),
+ (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + BUF),
+ (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + BUF),
+ (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + BUF),
+ (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + BUF),
+ (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + BUF),
+ (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + BUF),
+ (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + BUF),
+ (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + BUF),
+};
+
+/*
+ * Simple enough, just poke the appropriate ipi register
+ */
+static void loongson3_send_ipi_single(int cpu, unsigned int action)
+{
+ loongson3_ipi_write32((u32)action, ipi_set0_regs[cpu]);
+}
+
+static void
+loongson3_send_ipi_mask(const struct cpumask *mask, unsigned int action)
+{
+ unsigned int i;
+
+ for_each_cpu(i, mask)
+ loongson3_ipi_write32((u32)action, ipi_set0_regs[i]);
+}
+
+void loongson3_ipi_interrupt(struct pt_regs *regs)
+{
+ int cpu = smp_processor_id();
+ unsigned int action;
+
+ /* Load the ipi register to figure out what we're supposed to do */
+ action = loongson3_ipi_read32(ipi_status0_regs[cpu]);
+
+ /* Clear the ipi register to clear the interrupt */
+ loongson3_ipi_write32((u32)action, ipi_clear0_regs[cpu]);
+
+ if (action & SMP_RESCHEDULE_YOURSELF)
+ scheduler_ipi();
+
+ if (action & SMP_CALL_FUNCTION)
+ smp_call_function_interrupt();
+}
+
+/*
+ * SMP init and finish on secondary CPUs
+ */
+static void loongson3_init_secondary(void)
+{
+ int i;
+ unsigned int imask = STATUSF_IP7 | STATUSF_IP6 |
+ STATUSF_IP3 | STATUSF_IP2;
+
+ /* Set interrupt mask, but don't enable */
+ change_c0_status(ST0_IM, imask);
+
+ for (i = 0; i < loongson_sysconf.nr_cpus; i++)
+ loongson3_ipi_write32(0xffffffff, ipi_en0_regs[i]);
+}
+
+static void loongson3_smp_finish(void)
+{
+ write_c0_compare(read_c0_count() + mips_hpt_frequency/HZ);
+ local_irq_enable();
+ loongson3_ipi_write64(0,
+ (void *)(ipi_mailbox_buf[smp_processor_id()]+0x0));
+ pr_info("CPU#%d finished, CP0_ST=%x\n",
+ smp_processor_id(), read_c0_status());
+}
+
+static void __init loongson3_smp_setup(void)
+{
+ int i, num;
+
+ init_cpu_possible(cpu_none_mask);
+ set_cpu_possible(0, true);
+
+ __cpu_number_map[0] = 0;
+ __cpu_logical_map[0] = 0;
+
+ /* For unified kernel, NR_CPUS is the maximum possible value,
+ * loongson_sysconf.nr_cpus is the really present value */
+ for (i = 1, num = 0; i < loongson_sysconf.nr_cpus; i++) {
+ set_cpu_possible(i, true);
+ __cpu_number_map[i] = ++num;
+ __cpu_logical_map[num] = i;
+ }
+ pr_info("Detected %i available secondary CPU(s)\n", num);
+}
+
+static void __init loongson3_prepare_cpus(unsigned int max_cpus)
+{
+}
+
+/*
+ * Setup the PC, SP, and GP of a secondary processor and start it runing!
+ */
+static void loongson3_boot_secondary(int cpu, struct task_struct *idle)
+{
+ unsigned long startargs[4];
+
+ pr_info("Booting CPU#%d...\n", cpu);
+
+ /* startargs[] are initial PC, SP and GP for secondary CPU */
+ startargs[0] = (unsigned long)&smp_bootstrap;
+ startargs[1] = (unsigned long)__KSTK_TOS(idle);
+ startargs[2] = (unsigned long)task_thread_info(idle);
+ startargs[3] = 0;
+
+ pr_debug("CPU#%d, func_pc=%lx, sp=%lx, gp=%lx\n",
+ cpu, startargs[0], startargs[1], startargs[2]);
+
+ loongson3_ipi_write64(startargs[3], (void *)(ipi_mailbox_buf[cpu]+0x18));
+ loongson3_ipi_write64(startargs[2], (void *)(ipi_mailbox_buf[cpu]+0x10));
+ loongson3_ipi_write64(startargs[1], (void *)(ipi_mailbox_buf[cpu]+0x8));
+ loongson3_ipi_write64(startargs[0], (void *)(ipi_mailbox_buf[cpu]+0x0));
+}
+
+/*
+ * Final cleanup after all secondaries booted
+ */
+static void __init loongson3_cpus_done(void)
+{
+}
+
+struct plat_smp_ops loongson3_smp_ops = {
+ .send_ipi_single = loongson3_send_ipi_single,
+ .send_ipi_mask = loongson3_send_ipi_mask,
+ .init_secondary = loongson3_init_secondary,
+ .smp_finish = loongson3_smp_finish,
+ .cpus_done = loongson3_cpus_done,
+ .boot_secondary = loongson3_boot_secondary,
+ .smp_setup = loongson3_smp_setup,
+ .prepare_cpus = loongson3_prepare_cpus,
+};
diff --git a/arch/mips/loongson/loongson-3/smp.h b/arch/mips/loongson/loongson-3/smp.h
new file mode 100644
index 00000000000..3453e8c4f2f
--- /dev/null
+++ b/arch/mips/loongson/loongson-3/smp.h
@@ -0,0 +1,29 @@
+#ifndef __LOONGSON_SMP_H_
+#define __LOONGSON_SMP_H_
+
+/* for Loongson-3A smp support */
+
+/* 4 groups(nodes) in maximum in numa case */
+#define SMP_CORE_GROUP0_BASE 0x900000003ff01000
+#define SMP_CORE_GROUP1_BASE 0x900010003ff01000
+#define SMP_CORE_GROUP2_BASE 0x900020003ff01000
+#define SMP_CORE_GROUP3_BASE 0x900030003ff01000
+
+/* 4 cores in each group(node) */
+#define SMP_CORE0_OFFSET 0x000
+#define SMP_CORE1_OFFSET 0x100
+#define SMP_CORE2_OFFSET 0x200
+#define SMP_CORE3_OFFSET 0x300
+
+/* ipi registers offsets */
+#define STATUS0 0x00
+#define EN0 0x04
+#define SET0 0x08
+#define CLEAR0 0x0c
+#define STATUS1 0x10
+#define MASK1 0x14
+#define SET1 0x18
+#define CLEAR1 0x1c
+#define BUF 0x20
+
+#endif