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9b6695a8ad
A recent change requires cpu_possible_map to be initialized before
smp_sched_init() but most MIPS platforms were initializing their
processors in the prom_prepare_cpus callback of smp_prepare_cpus. The
simple fix of calling prom_prepare_cpus from one of the earlier SMP
initialization hooks doesn't work well either since IPIs may require
init_IRQ() to have completed, so bit the bullet and split
prom_prepare_cpus into two initialization functions, plat_smp_setup
which is called early from setup_arch and plat_prepare_cpus called where
prom_prepare_cpus used to be called.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
222 lines
5.3 KiB
C
222 lines
5.3 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file "COPYING" in the main directory of this
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* archive for more details.
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*
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* Copyright (C) 2000 - 2001 by Kanoj Sarcar (kanoj@sgi.com)
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* Copyright (C) 2000 - 2001 by Silicon Graphics, Inc.
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*/
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/nodemask.h>
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#include <asm/page.h>
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#include <asm/processor.h>
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#include <asm/sn/arch.h>
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#include <asm/sn/gda.h>
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#include <asm/sn/intr.h>
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#include <asm/sn/klconfig.h>
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#include <asm/sn/launch.h>
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#include <asm/sn/mapped_kernel.h>
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#include <asm/sn/sn_private.h>
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#include <asm/sn/types.h>
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#include <asm/sn/sn0/hubpi.h>
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#include <asm/sn/sn0/hubio.h>
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#include <asm/sn/sn0/ip27.h>
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/*
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* Takes as first input the PROM assigned cpu id, and the kernel
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* assigned cpu id as the second.
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*/
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static void alloc_cpupda(cpuid_t cpu, int cpunum)
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{
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cnodeid_t node = get_cpu_cnode(cpu);
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nasid_t nasid = COMPACT_TO_NASID_NODEID(node);
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cputonasid(cpunum) = nasid;
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cpu_data[cpunum].p_nodeid = node;
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cputoslice(cpunum) = get_cpu_slice(cpu);
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}
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static nasid_t get_actual_nasid(lboard_t *brd)
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{
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klhub_t *hub;
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if (!brd)
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return INVALID_NASID;
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/* find out if we are a completely disabled brd. */
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hub = (klhub_t *)find_first_component(brd, KLSTRUCT_HUB);
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if (!hub)
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return INVALID_NASID;
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if (!(hub->hub_info.flags & KLINFO_ENABLE)) /* disabled node brd */
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return hub->hub_info.physid;
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else
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return brd->brd_nasid;
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}
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static int do_cpumask(cnodeid_t cnode, nasid_t nasid, int highest)
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{
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static int tot_cpus_found = 0;
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lboard_t *brd;
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klcpu_t *acpu;
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int cpus_found = 0;
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cpuid_t cpuid;
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brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
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do {
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acpu = (klcpu_t *)find_first_component(brd, KLSTRUCT_CPU);
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while (acpu) {
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cpuid = acpu->cpu_info.virtid;
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/* cnode is not valid for completely disabled brds */
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if (get_actual_nasid(brd) == brd->brd_nasid)
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cpuid_to_compact_node[cpuid] = cnode;
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if (cpuid > highest)
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highest = cpuid;
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/* Only let it join in if it's marked enabled */
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if ((acpu->cpu_info.flags & KLINFO_ENABLE) &&
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(tot_cpus_found != NR_CPUS)) {
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cpu_set(cpuid, phys_cpu_present_map);
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alloc_cpupda(cpuid, tot_cpus_found);
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cpus_found++;
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tot_cpus_found++;
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}
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acpu = (klcpu_t *)find_component(brd, (klinfo_t *)acpu,
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KLSTRUCT_CPU);
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}
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brd = KLCF_NEXT(brd);
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if (!brd)
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break;
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brd = find_lboard(brd, KLTYPE_IP27);
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} while (brd);
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return highest;
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}
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void cpu_node_probe(void)
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{
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int i, highest = 0;
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gda_t *gdap = GDA;
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/*
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* Initialize the arrays to invalid nodeid (-1)
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*/
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for (i = 0; i < MAX_COMPACT_NODES; i++)
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compact_to_nasid_node[i] = INVALID_NASID;
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for (i = 0; i < MAX_NASIDS; i++)
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nasid_to_compact_node[i] = INVALID_CNODEID;
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for (i = 0; i < MAXCPUS; i++)
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cpuid_to_compact_node[i] = INVALID_CNODEID;
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/*
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* MCD - this whole "compact node" stuff can probably be dropped,
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* as we can handle sparse numbering now
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*/
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nodes_clear(node_online_map);
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for (i = 0; i < MAX_COMPACT_NODES; i++) {
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nasid_t nasid = gdap->g_nasidtable[i];
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if (nasid == INVALID_NASID)
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break;
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compact_to_nasid_node[i] = nasid;
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nasid_to_compact_node[nasid] = i;
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node_set_online(num_online_nodes());
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highest = do_cpumask(i, nasid, highest);
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}
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printk("Discovered %d cpus on %d nodes\n", highest + 1, num_online_nodes());
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}
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static __init void intr_clear_all(nasid_t nasid)
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{
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int i;
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REMOTE_HUB_S(nasid, PI_INT_MASK0_A, 0);
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REMOTE_HUB_S(nasid, PI_INT_MASK0_B, 0);
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REMOTE_HUB_S(nasid, PI_INT_MASK1_A, 0);
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REMOTE_HUB_S(nasid, PI_INT_MASK1_B, 0);
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for (i = 0; i < 128; i++)
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REMOTE_HUB_CLR_INTR(nasid, i);
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}
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void __init plat_smp_setup(void)
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{
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cnodeid_t cnode;
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for_each_online_node(cnode) {
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if (cnode == 0)
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continue;
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intr_clear_all(COMPACT_TO_NASID_NODEID(cnode));
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}
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replicate_kernel_text();
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/*
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* Assumption to be fixed: we're always booted on logical / physical
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* processor 0. While we're always running on logical processor 0
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* this still means this is physical processor zero; it might for
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* example be disabled in the firwware.
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*/
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alloc_cpupda(0, 0);
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}
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void __init plat_prepare_cpus(unsigned int max_cpus)
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{
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/* We already did everything necessary earlier */
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}
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/*
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* Launch a slave into smp_bootstrap(). It doesn't take an argument, and we
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* set sp to the kernel stack of the newly created idle process, gp to the proc
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* struct so that current_thread_info() will work.
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*/
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void __init prom_boot_secondary(int cpu, struct task_struct *idle)
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{
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unsigned long gp = (unsigned long)task_thread_info(idle);
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unsigned long sp = __KSTK_TOS(idle);
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LAUNCH_SLAVE(cputonasid(cpu),cputoslice(cpu),
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(launch_proc_t)MAPPED_KERN_RW_TO_K0(smp_bootstrap),
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0, (void *) sp, (void *) gp);
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}
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void prom_init_secondary(void)
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{
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per_cpu_init();
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local_irq_enable();
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}
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void __init prom_cpus_done(void)
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{
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}
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void prom_smp_finish(void)
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{
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}
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void core_send_ipi(int destid, unsigned int action)
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{
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int irq;
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switch (action) {
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case SMP_RESCHEDULE_YOURSELF:
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irq = CPU_RESCHED_A_IRQ;
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break;
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case SMP_CALL_FUNCTION:
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irq = CPU_CALL_A_IRQ;
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break;
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default:
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panic("sendintr");
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}
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irq += cputoslice(destid);
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/*
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* Convert the compact hub number to the NASID to get the correct
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* part of the address space. Then set the interrupt bit associated
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* with the CPU we want to send the interrupt to.
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*/
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REMOTE_HUB_SEND_INTR(COMPACT_TO_NASID_NODEID(cpu_to_node(destid)), irq);
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}
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