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Diffstat (limited to 'kernel/arch/mips/netlogic/common/smp.c')
| -rw-r--r-- | kernel/arch/mips/netlogic/common/smp.c | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/kernel/arch/mips/netlogic/common/smp.c b/kernel/arch/mips/netlogic/common/smp.c new file mode 100644 index 000000000..dc3e327fb --- /dev/null +++ b/kernel/arch/mips/netlogic/common/smp.c @@ -0,0 +1,280 @@ +/* + * Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). All rights + * reserved. + * + * This software is available to you under a choice of one of two + * licenses. You may choose to be licensed under the terms of the GNU + * General Public License (GPL) Version 2, available from the file + * COPYING in the main directory of this source tree, or the NetLogic + * license below: + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY NETLOGIC ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR + * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE + * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN + * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/init.h> +#include <linux/smp.h> +#include <linux/irq.h> + +#include <asm/mmu_context.h> + +#include <asm/netlogic/interrupt.h> +#include <asm/netlogic/mips-extns.h> +#include <asm/netlogic/haldefs.h> +#include <asm/netlogic/common.h> + +#if defined(CONFIG_CPU_XLP) +#include <asm/netlogic/xlp-hal/iomap.h> +#include <asm/netlogic/xlp-hal/xlp.h> +#include <asm/netlogic/xlp-hal/pic.h> +#elif defined(CONFIG_CPU_XLR) +#include <asm/netlogic/xlr/iomap.h> +#include <asm/netlogic/xlr/pic.h> +#include <asm/netlogic/xlr/xlr.h> +#else +#error "Unknown CPU" +#endif + +void nlm_send_ipi_single(int logical_cpu, unsigned int action) +{ + unsigned int hwtid; + uint64_t picbase; + + /* node id is part of hwtid, and needed for send_ipi */ + hwtid = cpu_logical_map(logical_cpu); + picbase = nlm_get_node(nlm_hwtid_to_node(hwtid))->picbase; + + if (action & SMP_CALL_FUNCTION) + nlm_pic_send_ipi(picbase, hwtid, IRQ_IPI_SMP_FUNCTION, 0); + if (action & SMP_RESCHEDULE_YOURSELF) + nlm_pic_send_ipi(picbase, hwtid, IRQ_IPI_SMP_RESCHEDULE, 0); +} + +void nlm_send_ipi_mask(const struct cpumask *mask, unsigned int action) +{ + int cpu; + + for_each_cpu(cpu, mask) { + nlm_send_ipi_single(cpu, action); + } +} + +/* IRQ_IPI_SMP_FUNCTION Handler */ +void nlm_smp_function_ipi_handler(unsigned int irq, struct irq_desc *desc) +{ + clear_c0_eimr(irq); + ack_c0_eirr(irq); + smp_call_function_interrupt(); + set_c0_eimr(irq); +} + +/* IRQ_IPI_SMP_RESCHEDULE handler */ +void nlm_smp_resched_ipi_handler(unsigned int irq, struct irq_desc *desc) +{ + clear_c0_eimr(irq); + ack_c0_eirr(irq); + scheduler_ipi(); + set_c0_eimr(irq); +} + +/* + * Called before going into mips code, early cpu init + */ +void nlm_early_init_secondary(int cpu) +{ + change_c0_config(CONF_CM_CMASK, 0x3); +#ifdef CONFIG_CPU_XLP + xlp_mmu_init(); +#endif + write_c0_ebase(nlm_current_node()->ebase); +} + +/* + * Code to run on secondary just after probing the CPU + */ +static void nlm_init_secondary(void) +{ + int hwtid; + + hwtid = hard_smp_processor_id(); + current_cpu_data.core = hwtid / NLM_THREADS_PER_CORE; + current_cpu_data.package = nlm_nodeid(); + nlm_percpu_init(hwtid); + nlm_smp_irq_init(hwtid); +} + +void nlm_prepare_cpus(unsigned int max_cpus) +{ + /* declare we are SMT capable */ + smp_num_siblings = nlm_threads_per_core; +} + +void nlm_smp_finish(void) +{ + local_irq_enable(); +} + +/* + * Boot all other cpus in the system, initialize them, and bring them into + * the boot function + */ +unsigned long nlm_next_gp; +unsigned long nlm_next_sp; +static cpumask_t phys_cpu_present_mask; + +void nlm_boot_secondary(int logical_cpu, struct task_struct *idle) +{ + uint64_t picbase; + int hwtid; + + hwtid = cpu_logical_map(logical_cpu); + picbase = nlm_get_node(nlm_hwtid_to_node(hwtid))->picbase; + + nlm_next_sp = (unsigned long)__KSTK_TOS(idle); + nlm_next_gp = (unsigned long)task_thread_info(idle); + + /* barrier for sp/gp store above */ + __sync(); + nlm_pic_send_ipi(picbase, hwtid, 1, 1); /* NMI */ +} + +void __init nlm_smp_setup(void) +{ + unsigned int boot_cpu; + int num_cpus, i, ncore, node; + volatile u32 *cpu_ready = nlm_get_boot_data(BOOT_CPU_READY); + + boot_cpu = hard_smp_processor_id(); + cpumask_clear(&phys_cpu_present_mask); + + cpumask_set_cpu(boot_cpu, &phys_cpu_present_mask); + __cpu_number_map[boot_cpu] = 0; + __cpu_logical_map[0] = boot_cpu; + set_cpu_possible(0, true); + + num_cpus = 1; + for (i = 0; i < NR_CPUS; i++) { + /* + * cpu_ready array is not set for the boot_cpu, + * it is only set for ASPs (see smpboot.S) + */ + if (cpu_ready[i]) { + cpumask_set_cpu(i, &phys_cpu_present_mask); + __cpu_number_map[i] = num_cpus; + __cpu_logical_map[num_cpus] = i; + set_cpu_possible(num_cpus, true); + node = nlm_hwtid_to_node(i); + cpumask_set_cpu(num_cpus, &nlm_get_node(node)->cpumask); + ++num_cpus; + } + } + + pr_info("Physical CPU mask: %*pb\n", + cpumask_pr_args(&phys_cpu_present_mask)); + pr_info("Possible CPU mask: %*pb\n", + cpumask_pr_args(cpu_possible_mask)); + + /* check with the cores we have woken up */ + for (ncore = 0, i = 0; i < NLM_NR_NODES; i++) + ncore += hweight32(nlm_get_node(i)->coremask); + + pr_info("Detected (%dc%dt) %d Slave CPU(s)\n", ncore, + nlm_threads_per_core, num_cpus); + + /* switch NMI handler to boot CPUs */ + nlm_set_nmi_handler(nlm_boot_secondary_cpus); +} + +static int nlm_parse_cpumask(cpumask_t *wakeup_mask) +{ + uint32_t core0_thr_mask, core_thr_mask; + int threadmode, i, j; + + core0_thr_mask = 0; + for (i = 0; i < NLM_THREADS_PER_CORE; i++) + if (cpumask_test_cpu(i, wakeup_mask)) + core0_thr_mask |= (1 << i); + switch (core0_thr_mask) { + case 1: + nlm_threads_per_core = 1; + threadmode = 0; + break; + case 3: + nlm_threads_per_core = 2; + threadmode = 2; + break; + case 0xf: + nlm_threads_per_core = 4; + threadmode = 3; + break; + default: + goto unsupp; + } + + /* Verify other cores CPU masks */ + for (i = 0; i < NR_CPUS; i += NLM_THREADS_PER_CORE) { + core_thr_mask = 0; + for (j = 0; j < NLM_THREADS_PER_CORE; j++) + if (cpumask_test_cpu(i + j, wakeup_mask)) + core_thr_mask |= (1 << j); + if (core_thr_mask != 0 && core_thr_mask != core0_thr_mask) + goto unsupp; + } + return threadmode; + +unsupp: + panic("Unsupported CPU mask %*pb", cpumask_pr_args(wakeup_mask)); + return 0; +} + +int nlm_wakeup_secondary_cpus(void) +{ + u32 *reset_data; + int threadmode; + + /* verify the mask and setup core config variables */ + threadmode = nlm_parse_cpumask(&nlm_cpumask); + + /* Setup CPU init parameters */ + reset_data = nlm_get_boot_data(BOOT_THREAD_MODE); + *reset_data = threadmode; + +#ifdef CONFIG_CPU_XLP + xlp_wakeup_secondary_cpus(); +#else + xlr_wakeup_secondary_cpus(); +#endif + return 0; +} + +struct plat_smp_ops nlm_smp_ops = { + .send_ipi_single = nlm_send_ipi_single, + .send_ipi_mask = nlm_send_ipi_mask, + .init_secondary = nlm_init_secondary, + .smp_finish = nlm_smp_finish, + .boot_secondary = nlm_boot_secondary, + .smp_setup = nlm_smp_setup, + .prepare_cpus = nlm_prepare_cpus, +}; 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