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/arch/mips/sgi-ip27/ip27-smp.c

https://bitbucket.org/evzijst/gittest
C | 225 lines | 156 code | 30 blank | 39 comment | 22 complexity | d3d0a33e923ba02639630d8fab35d475 MD5 | raw file
  1/*
  2 * This file is subject to the terms and conditions of the GNU General
  3 * Public License.  See the file "COPYING" in the main directory of this
  4 * archive for more details.
  5 *
  6 * Copyright (C) 2000 - 2001 by Kanoj Sarcar (kanoj@sgi.com)
  7 * Copyright (C) 2000 - 2001 by Silicon Graphics, Inc.
  8 */
  9#include <linux/init.h>
 10#include <linux/sched.h>
 11#include <linux/nodemask.h>
 12#include <asm/page.h>
 13#include <asm/processor.h>
 14#include <asm/sn/arch.h>
 15#include <asm/sn/gda.h>
 16#include <asm/sn/intr.h>
 17#include <asm/sn/klconfig.h>
 18#include <asm/sn/launch.h>
 19#include <asm/sn/mapped_kernel.h>
 20#include <asm/sn/sn_private.h>
 21#include <asm/sn/types.h>
 22#include <asm/sn/sn0/hubpi.h>
 23#include <asm/sn/sn0/hubio.h>
 24#include <asm/sn/sn0/ip27.h>
 25
 26/*
 27 * Takes as first input the PROM assigned cpu id, and the kernel
 28 * assigned cpu id as the second.
 29 */
 30static void alloc_cpupda(cpuid_t cpu, int cpunum)
 31{
 32	cnodeid_t node = get_cpu_cnode(cpu);
 33	nasid_t nasid = COMPACT_TO_NASID_NODEID(node);
 34
 35	cputonasid(cpunum) = nasid;
 36	cpu_data[cpunum].p_nodeid = node;
 37	cputoslice(cpunum) = get_cpu_slice(cpu);
 38}
 39
 40static nasid_t get_actual_nasid(lboard_t *brd)
 41{
 42	klhub_t *hub;
 43
 44	if (!brd)
 45		return INVALID_NASID;
 46
 47	/* find out if we are a completely disabled brd. */
 48	hub  = (klhub_t *)find_first_component(brd, KLSTRUCT_HUB);
 49	if (!hub)
 50		return INVALID_NASID;
 51	if (!(hub->hub_info.flags & KLINFO_ENABLE))	/* disabled node brd */
 52		return hub->hub_info.physid;
 53	else
 54		return brd->brd_nasid;
 55}
 56
 57static int do_cpumask(cnodeid_t cnode, nasid_t nasid, int highest)
 58{
 59	static int tot_cpus_found = 0;
 60	lboard_t *brd;
 61	klcpu_t *acpu;
 62	int cpus_found = 0;
 63	cpuid_t cpuid;
 64
 65	brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
 66
 67	do {
 68		acpu = (klcpu_t *)find_first_component(brd, KLSTRUCT_CPU);
 69		while (acpu) {
 70			cpuid = acpu->cpu_info.virtid;
 71			/* cnode is not valid for completely disabled brds */
 72			if (get_actual_nasid(brd) == brd->brd_nasid)
 73				cpuid_to_compact_node[cpuid] = cnode;
 74			if (cpuid > highest)
 75				highest = cpuid;
 76			/* Only let it join in if it's marked enabled */
 77			if ((acpu->cpu_info.flags & KLINFO_ENABLE) &&
 78			    (tot_cpus_found != NR_CPUS)) {
 79				cpu_set(cpuid, phys_cpu_present_map);
 80				alloc_cpupda(cpuid, tot_cpus_found);
 81				cpus_found++;
 82				tot_cpus_found++;
 83			}
 84			acpu = (klcpu_t *)find_component(brd, (klinfo_t *)acpu,
 85								KLSTRUCT_CPU);
 86		}
 87		brd = KLCF_NEXT(brd);
 88		if (!brd)
 89			break;
 90
 91		brd = find_lboard(brd, KLTYPE_IP27);
 92	} while (brd);
 93
 94	return highest;
 95}
 96
 97void cpu_node_probe(void)
 98{
 99	int i, highest = 0;
100	gda_t *gdap = GDA;
101
102	/*
103	 * Initialize the arrays to invalid nodeid (-1)
104	 */
105	for (i = 0; i < MAX_COMPACT_NODES; i++)
106		compact_to_nasid_node[i] = INVALID_NASID;
107	for (i = 0; i < MAX_NASIDS; i++)
108		nasid_to_compact_node[i] = INVALID_CNODEID;
109	for (i = 0; i < MAXCPUS; i++)
110		cpuid_to_compact_node[i] = INVALID_CNODEID;
111
112	/*
113	 * MCD - this whole "compact node" stuff can probably be dropped,
114	 * as we can handle sparse numbering now
115	 */
116	nodes_clear(node_online_map);
117	for (i = 0; i < MAX_COMPACT_NODES; i++) {
118		nasid_t nasid = gdap->g_nasidtable[i];
119		if (nasid == INVALID_NASID)
120			break;
121		compact_to_nasid_node[i] = nasid;
122		nasid_to_compact_node[nasid] = i;
123		node_set_online(num_online_nodes());
124		highest = do_cpumask(i, nasid, highest);
125	}
126
127	printk("Discovered %d cpus on %d nodes\n", highest + 1, num_online_nodes());
128}
129
130static void intr_clear_bits(nasid_t nasid, volatile hubreg_t *pend,
131	int base_level)
132{
133	volatile hubreg_t bits;
134	int i;
135
136	/* Check pending interrupts */
137	if ((bits = HUB_L(pend)) != 0)
138		for (i = 0; i < N_INTPEND_BITS; i++)
139			if (bits & (1 << i))
140				LOCAL_HUB_CLR_INTR(base_level + i);
141}
142
143static void intr_clear_all(nasid_t nasid)
144{
145	REMOTE_HUB_S(nasid, PI_INT_MASK0_A, 0);
146	REMOTE_HUB_S(nasid, PI_INT_MASK0_B, 0);
147	REMOTE_HUB_S(nasid, PI_INT_MASK1_A, 0);
148	REMOTE_HUB_S(nasid, PI_INT_MASK1_B, 0);
149	intr_clear_bits(nasid, REMOTE_HUB_ADDR(nasid, PI_INT_PEND0),
150	                INT_PEND0_BASELVL);
151	intr_clear_bits(nasid, REMOTE_HUB_ADDR(nasid, PI_INT_PEND1),
152	                INT_PEND1_BASELVL);
153}
154
155void __init prom_prepare_cpus(unsigned int max_cpus)
156{
157	cnodeid_t	cnode;
158
159	for_each_online_node(cnode)
160		intr_clear_all(COMPACT_TO_NASID_NODEID(cnode));
161
162	replicate_kernel_text();
163
164	/*
165	 * Assumption to be fixed: we're always booted on logical / physical
166	 * processor 0.  While we're always running on logical processor 0
167	 * this still means this is physical processor zero; it might for
168	 * example be disabled in the firwware.
169	 */
170	alloc_cpupda(0, 0);
171}
172
173/*
174 * Launch a slave into smp_bootstrap().  It doesn't take an argument, and we
175 * set sp to the kernel stack of the newly created idle process, gp to the proc
176 * struct so that current_thread_info() will work.
177 */
178void __init prom_boot_secondary(int cpu, struct task_struct *idle)
179{
180	unsigned long gp = (unsigned long) idle->thread_info;
181	unsigned long sp = gp + THREAD_SIZE - 32;
182
183	LAUNCH_SLAVE(cputonasid(cpu),cputoslice(cpu),
184		(launch_proc_t)MAPPED_KERN_RW_TO_K0(smp_bootstrap),
185		0, (void *) sp, (void *) gp);
186}
187
188void prom_init_secondary(void)
189{
190	per_cpu_init();
191	local_irq_enable();
192}
193
194void __init prom_cpus_done(void)
195{
196}
197
198void prom_smp_finish(void)
199{
200}
201
202void core_send_ipi(int destid, unsigned int action)
203{
204	int irq;
205
206	switch (action) {
207	case SMP_RESCHEDULE_YOURSELF:
208		irq = CPU_RESCHED_A_IRQ;
209		break;
210	case SMP_CALL_FUNCTION:
211		irq = CPU_CALL_A_IRQ;
212		break;
213	default:
214		panic("sendintr");
215	}
216
217	irq += cputoslice(destid);
218
219	/*
220	 * Convert the compact hub number to the NASID to get the correct
221	 * part of the address space.  Then set the interrupt bit associated
222	 * with the CPU we want to send the interrupt to.
223	 */
224	REMOTE_HUB_SEND_INTR(COMPACT_TO_NASID_NODEID(cpu_to_node(destid)), irq);
225}