[mirror_ubuntu-artful-kernel.git] / arch / mips / sgi-ip27 / ip27-smp.c

/*
 * This file is subject to the terms and conditions of the GNU General
 * Public License.  See the file "COPYING" in the main directory of this
 * archive for more details.
 *
 * Copyright (C) 2000 - 2001 by Kanoj Sarcar (kanoj@sgi.com)
 * Copyright (C) 2000 - 2001 by Silicon Graphics, Inc.
 */
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/topology.h>
#include <linux/nodemask.h>
#include <asm/page.h>
#include <asm/processor.h>
#include <asm/sn/arch.h>
#include <asm/sn/gda.h>
#include <asm/sn/intr.h>
#include <asm/sn/klconfig.h>
#include <asm/sn/launch.h>
#include <asm/sn/mapped_kernel.h>
#include <asm/sn/sn_private.h>
#include <asm/sn/types.h>
#include <asm/sn/sn0/hubpi.h>
#include <asm/sn/sn0/hubio.h>
#include <asm/sn/sn0/ip27.h>

/*
 * Takes as first input the PROM assigned cpu id, and the kernel
 * assigned cpu id as the second.
 */
static void alloc_cpupda(cpuid_t cpu, int cpunum)
{
	cnodeid_t node = get_cpu_cnode(cpu);
	nasid_t nasid = COMPACT_TO_NASID_NODEID(node);

	cputonasid(cpunum) = nasid;
	sn_cpu_info[cpunum].p_nodeid = node;
	cputoslice(cpunum) = get_cpu_slice(cpu);
}

static nasid_t get_actual_nasid(lboard_t *brd)
{
	klhub_t *hub;

	if (!brd)
		return INVALID_NASID;

	/* find out if we are a completely disabled brd. */
	hub  = (klhub_t *)find_first_component(brd, KLSTRUCT_HUB);
	if (!hub)
		return INVALID_NASID;
	if (!(hub->hub_info.flags & KLINFO_ENABLE))	/* disabled node brd */
		return hub->hub_info.physid;
	else
		return brd->brd_nasid;
}

static int do_cpumask(cnodeid_t cnode, nasid_t nasid, int highest)
{
	static int tot_cpus_found = 0;
	lboard_t *brd;
	klcpu_t *acpu;
	int cpus_found = 0;
	cpuid_t cpuid;

	brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);

	do {
		acpu = (klcpu_t *)find_first_component(brd, KLSTRUCT_CPU);
		while (acpu) {
			cpuid = acpu->cpu_info.virtid;
			/* cnode is not valid for completely disabled brds */
			if (get_actual_nasid(brd) == brd->brd_nasid)
				cpuid_to_compact_node[cpuid] = cnode;
			if (cpuid > highest)
				highest = cpuid;
			/* Only let it join in if it's marked enabled */
			if ((acpu->cpu_info.flags & KLINFO_ENABLE) &&
			    (tot_cpus_found != NR_CPUS)) {
				set_cpu_possible(cpuid, true);
				alloc_cpupda(cpuid, tot_cpus_found);
				cpus_found++;
				tot_cpus_found++;
			}
			acpu = (klcpu_t *)find_component(brd, (klinfo_t *)acpu,
								KLSTRUCT_CPU);
		}
		brd = KLCF_NEXT(brd);
		if (!brd)
			break;

		brd = find_lboard(brd, KLTYPE_IP27);
	} while (brd);

	return highest;
}

void cpu_node_probe(void)
{
	int i, highest = 0;
	gda_t *gdap = GDA;

	/*
	 * Initialize the arrays to invalid nodeid (-1)
	 */
	for (i = 0; i < MAX_COMPACT_NODES; i++)
		compact_to_nasid_node[i] = INVALID_NASID;
	for (i = 0; i < MAX_NASIDS; i++)
		nasid_to_compact_node[i] = INVALID_CNODEID;
	for (i = 0; i < MAXCPUS; i++)
		cpuid_to_compact_node[i] = INVALID_CNODEID;

	/*
	 * MCD - this whole "compact node" stuff can probably be dropped,
	 * as we can handle sparse numbering now
	 */
	nodes_clear(node_online_map);
	for (i = 0; i < MAX_COMPACT_NODES; i++) {
		nasid_t nasid = gdap->g_nasidtable[i];
		if (nasid == INVALID_NASID)
			break;
		compact_to_nasid_node[i] = nasid;
		nasid_to_compact_node[nasid] = i;
		node_set_online(num_online_nodes());
		highest = do_cpumask(i, nasid, highest);
	}

	printk("Discovered %d cpus on %d nodes\n", highest + 1, num_online_nodes());
}

static __init void intr_clear_all(nasid_t nasid)
{
	int i;

	REMOTE_HUB_S(nasid, PI_INT_MASK0_A, 0);
	REMOTE_HUB_S(nasid, PI_INT_MASK0_B, 0);
	REMOTE_HUB_S(nasid, PI_INT_MASK1_A, 0);
	REMOTE_HUB_S(nasid, PI_INT_MASK1_B, 0);

	for (i = 0; i < 128; i++)
		REMOTE_HUB_CLR_INTR(nasid, i);
}

static void ip27_send_ipi_single(int destid, unsigned int action)
{
	int irq;

	switch (action) {
	case SMP_RESCHEDULE_YOURSELF:
		irq = CPU_RESCHED_A_IRQ;
		break;
	case SMP_CALL_FUNCTION:
		irq = CPU_CALL_A_IRQ;
		break;
	default:
		panic("sendintr");
	}

	irq += cputoslice(destid);

	/*
	 * Convert the compact hub number to the NASID to get the correct
	 * part of the address space.  Then set the interrupt bit associated
	 * with the CPU we want to send the interrupt to.
	 */
	REMOTE_HUB_SEND_INTR(COMPACT_TO_NASID_NODEID(cpu_to_node(destid)), irq);
}

static void ip27_send_ipi_mask(const struct cpumask *mask, unsigned int action)
{
	unsigned int i;

	for_each_cpu(i, mask)
		ip27_send_ipi_single(i, action);
}

static void ip27_init_secondary(void)
{
	per_cpu_init();
}

static void ip27_smp_finish(void)
{
	extern void hub_rt_clock_event_init(void);

	hub_rt_clock_event_init();
	local_irq_enable();
}

/*
 * Launch a slave into smp_bootstrap().	 It doesn't take an argument, and we
 * set sp to the kernel stack of the newly created idle process, gp to the proc
 * struct so that current_thread_info() will work.
 */
static void ip27_boot_secondary(int cpu, struct task_struct *idle)
{
	unsigned long gp = (unsigned long)task_thread_info(idle);
	unsigned long sp = __KSTK_TOS(idle);

	LAUNCH_SLAVE(cputonasid(cpu), cputoslice(cpu),
		(launch_proc_t)MAPPED_KERN_RW_TO_K0(smp_bootstrap),
		0, (void *) sp, (void *) gp);
}

static void __init ip27_smp_setup(void)
{
	cnodeid_t	cnode;

	for_each_online_node(cnode) {
		if (cnode == 0)
			continue;
		intr_clear_all(COMPACT_TO_NASID_NODEID(cnode));
	}

	replicate_kernel_text();

	/*
	 * Assumption to be fixed: we're always booted on logical / physical
	 * processor 0.	 While we're always running on logical processor 0
	 * this still means this is physical processor zero; it might for
	 * example be disabled in the firmware.
	 */
	alloc_cpupda(0, 0);
}

static void __init ip27_prepare_cpus(unsigned int max_cpus)
{
	/* We already did everything necessary earlier */
}

struct plat_smp_ops ip27_smp_ops = {
	.send_ipi_single	= ip27_send_ipi_single,
	.send_ipi_mask		= ip27_send_ipi_mask,
	.init_secondary		= ip27_init_secondary,
	.smp_finish		= ip27_smp_finish,
	.boot_secondary		= ip27_boot_secondary,
	.smp_setup		= ip27_smp_setup,
	.prepare_cpus		= ip27_prepare_cpus,
};
Commit	Line	Data
1da177e4 LT	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>
ee6a3d19	11	#include <linux/topology.h>
1da177e4 LT	12	#include <linux/nodemask.h>
	13	#include <asm/page.h>
	14	#include <asm/processor.h>
	15	#include <asm/sn/arch.h>
	16	#include <asm/sn/gda.h>
	17	#include <asm/sn/intr.h>
	18	#include <asm/sn/klconfig.h>
	19	#include <asm/sn/launch.h>
	20	#include <asm/sn/mapped_kernel.h>
	21	#include <asm/sn/sn_private.h>
	22	#include <asm/sn/types.h>
	23	#include <asm/sn/sn0/hubpi.h>
	24	#include <asm/sn/sn0/hubio.h>
	25	#include <asm/sn/sn0/ip27.h>
	26
	27	/*
	28	* Takes as first input the PROM assigned cpu id, and the kernel
	29	* assigned cpu id as the second.
	30	*/
	31	static void alloc_cpupda(cpuid_t cpu, int cpunum)
	32	{
	33	cnodeid_t node = get_cpu_cnode(cpu);
	34	nasid_t nasid = COMPACT_TO_NASID_NODEID(node);
	35
	36	cputonasid(cpunum) = nasid;
cc6e8e08	37	sn_cpu_info[cpunum].p_nodeid = node;
1da177e4 LT	38	cputoslice(cpunum) = get_cpu_slice(cpu);
	39	}
	40
	41	static nasid_t get_actual_nasid(lboard_t *brd)
	42	{
	43	klhub_t *hub;
	44
	45	if (!brd)
	46	return INVALID_NASID;
	47
	48	/* find out if we are a completely disabled brd. */
	49	hub = (klhub_t *)find_first_component(brd, KLSTRUCT_HUB);
	50	if (!hub)
	51	return INVALID_NASID;
	52	if (!(hub->hub_info.flags & KLINFO_ENABLE)) /* disabled node brd */
	53	return hub->hub_info.physid;
	54	else
	55	return brd->brd_nasid;
	56	}
	57
	58	static int do_cpumask(cnodeid_t cnode, nasid_t nasid, int highest)
	59	{
	60	static int tot_cpus_found = 0;
	61	lboard_t *brd;
	62	klcpu_t *acpu;
	63	int cpus_found = 0;
	64	cpuid_t cpuid;
	65
	66	brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
	67
	68	do {
	69	acpu = (klcpu_t *)find_first_component(brd, KLSTRUCT_CPU);
	70	while (acpu) {
	71	cpuid = acpu->cpu_info.virtid;
	72	/* cnode is not valid for completely disabled brds */
	73	if (get_actual_nasid(brd) == brd->brd_nasid)
	74	cpuid_to_compact_node[cpuid] = cnode;
	75	if (cpuid > highest)
	76	highest = cpuid;
	77	/* Only let it join in if it's marked enabled */
	78	if ((acpu->cpu_info.flags & KLINFO_ENABLE) &&
	79	(tot_cpus_found != NR_CPUS)) {
0b5f9c00	80	set_cpu_possible(cpuid, true);
1da177e4 LT	81	alloc_cpupda(cpuid, tot_cpus_found);
	82	cpus_found++;
	83	tot_cpus_found++;
	84	}
	85	acpu = (klcpu_t )find_component(brd, (klinfo_t )acpu,
	86	KLSTRUCT_CPU);
	87	}
	88	brd = KLCF_NEXT(brd);
	89	if (!brd)
	90	break;
	91
	92	brd = find_lboard(brd, KLTYPE_IP27);
	93	} while (brd);
	94
	95	return highest;
	96	}
	97
	98	void cpu_node_probe(void)
	99	{
	100	int i, highest = 0;
	101	gda_t *gdap = GDA;
	102
	103	/*
	104	* Initialize the arrays to invalid nodeid (-1)
	105	*/
	106	for (i = 0; i < MAX_COMPACT_NODES; i++)
	107	compact_to_nasid_node[i] = INVALID_NASID;
	108	for (i = 0; i < MAX_NASIDS; i++)
	109	nasid_to_compact_node[i] = INVALID_CNODEID;
	110	for (i = 0; i < MAXCPUS; i++)
	111	cpuid_to_compact_node[i] = INVALID_CNODEID;
	112
	113	/*
	114	* MCD - this whole "compact node" stuff can probably be dropped,
	115	* as we can handle sparse numbering now
	116	*/
	117	nodes_clear(node_online_map);
	118	for (i = 0; i < MAX_COMPACT_NODES; i++) {
	119	nasid_t nasid = gdap->g_nasidtable[i];
	120	if (nasid == INVALID_NASID)
	121	break;
	122	compact_to_nasid_node[i] = nasid;
	123	nasid_to_compact_node[nasid] = i;
	124	node_set_online(num_online_nodes());
	125	highest = do_cpumask(i, nasid, highest);
	126	}
	127
	128	printk("Discovered %d cpus on %d nodes\n", highest + 1, num_online_nodes());
	129	}
	130
39408c6a	131	static __init void intr_clear_all(nasid_t nasid)
1da177e4	132	{
1da177e4 LT	133	int i;
1da177e4 LT	134
1da177e4 LT	135	REMOTE_HUB_S(nasid, PI_INT_MASK0_A, 0);
	136	REMOTE_HUB_S(nasid, PI_INT_MASK0_B, 0);
	137	REMOTE_HUB_S(nasid, PI_INT_MASK1_A, 0);
	138	REMOTE_HUB_S(nasid, PI_INT_MASK1_B, 0);
39408c6a RB	139
	140	for (i = 0; i < 128; i++)
	141	REMOTE_HUB_CLR_INTR(nasid, i);
1da177e4 LT	142	}
1da177e4 LT	143
87353d8a	144	static void ip27_send_ipi_single(int destid, unsigned int action)
1da177e4	145	{
87353d8a	146	int irq;
1da177e4	147
87353d8a RB	148	switch (action) {
	149	case SMP_RESCHEDULE_YOURSELF:
	150	irq = CPU_RESCHED_A_IRQ;
	151	break;
	152	case SMP_CALL_FUNCTION:
	153	irq = CPU_CALL_A_IRQ;
	154	break;
	155	default:
	156	panic("sendintr");
de1db6ff	157	}
1da177e4	158
87353d8a	159	irq += cputoslice(destid);
1da177e4 LT	160
1da177e4 LT	161	/*
87353d8a RB	162	* Convert the compact hub number to the NASID to get the correct
	163	* part of the address space. Then set the interrupt bit associated
	164	* with the CPU we want to send the interrupt to.
1da177e4	165	*/
87353d8a	166	REMOTE_HUB_SEND_INTR(COMPACT_TO_NASID_NODEID(cpu_to_node(destid)), irq);
1da177e4 LT	167	}
1da177e4 LT	168
b533e652	169	static void ip27_send_ipi_mask(const struct cpumask *mask, unsigned int action)
87353d8a RB	170	{
	171	unsigned int i;
	172
48a048fe	173	for_each_cpu(i, mask)
87353d8a RB	174	ip27_send_ipi_single(i, action);
	175	}
	176
078a55fc	177	static void ip27_init_secondary(void)
87353d8a RB	178	{
87353d8a RB	179	per_cpu_init();
87353d8a RB	180	}
87353d8a RB	181
078a55fc	182	static void ip27_smp_finish(void)
87353d8a	183	{
b32bb803 TB	184	extern void hub_rt_clock_event_init(void);
	185
	186	hub_rt_clock_event_init();
	187	local_irq_enable();
87353d8a RB	188	}
87353d8a RB	189
1da177e4	190	/*
70342287	191	* Launch a slave into smp_bootstrap(). It doesn't take an argument, and we
1da177e4 LT	192	* set sp to the kernel stack of the newly created idle process, gp to the proc
	193	* struct so that current_thread_info() will work.
	194	*/
078a55fc	195	static void ip27_boot_secondary(int cpu, struct task_struct *idle)
1da177e4	196	{
dc8f6029 AV	197	unsigned long gp = (unsigned long)task_thread_info(idle);
dc8f6029 AV	198	unsigned long sp = __KSTK_TOS(idle);
1da177e4	199
21a151d8	200	LAUNCH_SLAVE(cputonasid(cpu), cputoslice(cpu),
1da177e4 LT	201	(launch_proc_t)MAPPED_KERN_RW_TO_K0(smp_bootstrap),
	202	0, (void ) sp, (void ) gp);
	203	}
	204
87353d8a	205	static void __init ip27_smp_setup(void)
1da177e4	206	{
87353d8a	207	cnodeid_t cnode;
1da177e4	208
87353d8a RB	209	for_each_online_node(cnode) {
	210	if (cnode == 0)
	211	continue;
	212	intr_clear_all(COMPACT_TO_NASID_NODEID(cnode));
1da177e4 LT	213	}
1da177e4 LT	214
87353d8a	215	replicate_kernel_text();
1da177e4 LT	216
1da177e4 LT	217	/*
87353d8a	218	* Assumption to be fixed: we're always booted on logical / physical
70342287	219	* processor 0. While we're always running on logical processor 0
87353d8a	220	* this still means this is physical processor zero; it might for
877d0310	221	* example be disabled in the firmware.
1da177e4	222	*/
87353d8a	223	alloc_cpupda(0, 0);
1da177e4	224	}
87353d8a RB	225
	226	static void __init ip27_prepare_cpus(unsigned int max_cpus)
	227	{
	228	/* We already did everything necessary earlier */
	229	}
	230
	231	struct plat_smp_ops ip27_smp_ops = {
	232	.send_ipi_single = ip27_send_ipi_single,
	233	.send_ipi_mask = ip27_send_ipi_mask,
	234	.init_secondary = ip27_init_secondary,
	235	.smp_finish = ip27_smp_finish,
87353d8a RB	236	.boot_secondary = ip27_boot_secondary,
	237	.smp_setup = ip27_smp_setup,
	238	.prepare_cpus = ip27_prepare_cpus,
	239	};