Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757076Ab2FVDFm (ORCPT ); Thu, 21 Jun 2012 23:05:42 -0400 Received: from mail-pb0-f46.google.com ([209.85.160.46]:61380 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754103Ab2FVDFh (ORCPT ); Thu, 21 Jun 2012 23:05:37 -0400 From: Huacai Chen To: Ralf Baechle Cc: linux-mips@linux-mips.org, linux-kernel@vger.kernel.org, Fuxin Zhang , Zhangjin Wu , Huacai Chen , Hongliang Tao , Hua Yan Subject: [PATCH V3 13/16] MIPS: Loongson 3: Add Loongson-3 SMP support. Date: Fri, 22 Jun 2012 11:01:10 +0800 Message-Id: <1340334073-17804-14-git-send-email-chenhc@lemote.com> X-Mailer: git-send-email 1.7.7.3 In-Reply-To: <1340334073-17804-1-git-send-email-chenhc@lemote.com> References: <1340334073-17804-1-git-send-email-chenhc@lemote.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 15099 Lines: 424 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 Signed-off-by: Hongliang Tao Signed-off-by: Hua Yan --- arch/mips/loongson/common/init.c | 5 + arch/mips/loongson/common/setup.c | 8 +- arch/mips/loongson/loongson-3/Makefile | 2 + arch/mips/loongson/loongson-3/smp.c | 278 ++++++++++++++++++++++++++++++++ arch/mips/loongson/loongson-3/smp.h | 24 +++ 5 files changed, 312 insertions(+), 5 deletions(-) create mode 100644 arch/mips/loongson/loongson-3/smp.c create mode 100644 arch/mips/loongson/loongson-3/smp.h diff --git a/arch/mips/loongson/common/init.c b/arch/mips/loongson/common/init.c index 1c29b19..30d20ad 100644 --- a/arch/mips/loongson/common/init.c +++ b/arch/mips/loongson/common/init.c @@ -12,6 +12,8 @@ #include +extern struct plat_smp_ops loongson3_smp_ops; + /* Loongson CPU address windows config space base address */ unsigned long __maybe_unused _loongson_addrwincfg_base; @@ -33,6 +35,9 @@ void __init prom_init(void) /*init the uart base address */ prom_init_uart_base(); +#if defined(CONFIG_SMP) + register_smp_ops(&loongson3_smp_ops); +#endif } void __init prom_free_prom_memory(void) diff --git a/arch/mips/loongson/common/setup.c b/arch/mips/loongson/common/setup.c index 27d826b..464cc5a 100644 --- a/arch/mips/loongson/common/setup.c +++ b/arch/mips/loongson/common/setup.c @@ -18,9 +18,6 @@ #include #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 b9968cd..70152b2 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/smp.c b/arch/mips/loongson/loongson-3/smp.c new file mode 100644 index 0000000..8923117 --- /dev/null +++ b/arch/mips/loongson/loongson-3/smp.c @@ -0,0 +1,278 @@ +/* + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "smp.h" + +/* write a 64bit value to ipi register */ +void loongson3_ipi_write64(uint64_t action, void * addr) +{ + *((uint64_t *)addr) = action; +}; + +/* read a 64bit value from ipi register */ +uint64_t loongson3_ipi_read64(void * addr) +{ + return *((uint64_t *)addr); +}; + +/* write a 32bit value to ipi register */ +void loongson3_ipi_write32(uint32_t action, void * addr) +{ + *((uint32_t *)addr) = action; +}; + +/* read a 32bit value from ipi register */ +uint32_t loongson3_ipi_read32(void * addr) +{ + return *((uint32_t *)addr); +}; + +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_status_regs0[] = { + (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 volatile 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_send_ipi_single(i, action); +} + +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_status_regs0[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 + */ +void __cpuinit loongson3_init_secondary(void) +{ + int i; + unsigned int imask = STATUSF_IP7 | STATUSF_IP6 | STATUSF_IP5 | + STATUSF_IP4 | STATUSF_IP3 | STATUSF_IP2; + + /* Set interrupt mask, but don't enable */ + change_c0_status(ST0_IM, imask); + + for (i = 0; i < NR_CPUS; i++) { + loongson3_ipi_write32(0xffffffff, ipi_en0_regs[i]); + } +} + +void __cpuinit 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)); + printk(KERN_INFO "CPU#%d finished, CP0_ST=%x\n", + smp_processor_id(), read_c0_status()); +} + +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, + * nr_cpus_loongson is the really present value */ + for (i = 1, num = 0; i < nr_cpus_loongson; i++) { + set_cpu_possible(i, true); + __cpu_number_map[i] = ++num; + __cpu_logical_map[num] = i; + } + printk(KERN_INFO "Detected %i available secondary CPU(s)\n", num); +} + +void __init loongson3_prepare_cpus(unsigned int max_cpus) +{ +} + +/* + * Setup the PC, SP, and GP of a secondary processor and start it runing! + */ +void __cpuinit loongson3_boot_secondary(int cpu, struct task_struct *idle) +{ + volatile unsigned long startargs[4]; + + printk(KERN_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; + + printk(KERN_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 + */ +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 0000000..dc9ce69 --- /dev/null +++ b/arch/mips/loongson/loongson-3/smp.h @@ -0,0 +1,24 @@ +/* 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 -- 1.7.7.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/