summaryrefslogtreecommitdiffstats
path: root/sys/powerpc/pseries/xics.c
blob: 4ae7c9ed3a2b099290d0fb0a586c53cae17499d1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
/*-
 * Copyright 2011 Nathan Whitehorn
 *
 * 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 THE AUTHOR ``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 THE AUTHOR 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/smp.h>

#include <vm/vm.h>
#include <vm/pmap.h>

#include <machine/bus.h>
#include <machine/intr_machdep.h>
#include <machine/md_var.h>
#include <machine/rtas.h>

#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>

#include "phyp-hvcall.h"
#include "pic_if.h"

#define XICP_PRIORITY	5	/* Random non-zero number */
#define XICP_IPI	2
#define MAX_XICP_IRQS	(1<<24)	/* 24-bit XIRR field */

static int	xicp_probe(device_t);
static int	xicp_attach(device_t);
static int	xics_probe(device_t);
static int	xics_attach(device_t);

static void	xicp_bind(device_t dev, u_int irq, cpuset_t cpumask);
static void	xicp_dispatch(device_t, struct trapframe *);
static void	xicp_enable(device_t, u_int, u_int);
static void	xicp_eoi(device_t, u_int);
static void	xicp_ipi(device_t, u_int);
static void	xicp_mask(device_t, u_int);
static void	xicp_unmask(device_t, u_int);

static device_method_t  xicp_methods[] = {
	/* Device interface */
	DEVMETHOD(device_probe,		xicp_probe),
	DEVMETHOD(device_attach,	xicp_attach),

	/* PIC interface */
	DEVMETHOD(pic_bind,		xicp_bind),
	DEVMETHOD(pic_dispatch,		xicp_dispatch),
	DEVMETHOD(pic_enable,		xicp_enable),
	DEVMETHOD(pic_eoi,		xicp_eoi),
	DEVMETHOD(pic_ipi,		xicp_ipi),
	DEVMETHOD(pic_mask,		xicp_mask),
	DEVMETHOD(pic_unmask,		xicp_unmask),

	{ 0, 0 },
};

static device_method_t  xics_methods[] = {
	/* Device interface */
	DEVMETHOD(device_probe,		xics_probe),
	DEVMETHOD(device_attach,	xics_attach),

	{ 0, 0 },
};

struct xicp_softc {
	struct mtx sc_mtx;

	int ibm_int_on;
	int ibm_int_off;
	int ibm_get_xive;
	int ibm_set_xive;

	/* XXX: inefficient -- hash table? tree? */
	struct {
		int irq;
		int vector;
	} intvecs[256];
	int nintvecs;
};

static driver_t xicp_driver = {
	"xicp",
	xicp_methods,
	sizeof(struct xicp_softc)
};

static driver_t xics_driver = {
	"xics",
	xics_methods,
	0
};

static devclass_t xicp_devclass;
static devclass_t xics_devclass;

EARLY_DRIVER_MODULE(xicp, ofwbus, xicp_driver, xicp_devclass, 0, 0,
    BUS_PASS_INTERRUPT-1);
EARLY_DRIVER_MODULE(xics, ofwbus, xics_driver, xics_devclass, 0, 0,
    BUS_PASS_INTERRUPT);

static int
xicp_probe(device_t dev)
{
	if (ofw_bus_get_name(dev) == NULL || strcmp(ofw_bus_get_name(dev),
	    "interrupt-controller") != 0)
		return (ENXIO);

	if (!ofw_bus_is_compatible(dev, "ibm,ppc-xicp"))
		return (ENXIO);

	device_set_desc(dev, "PAPR virtual interrupt controller");
	return (BUS_PROBE_GENERIC);
}

static int
xics_probe(device_t dev)
{
	if (ofw_bus_get_name(dev) == NULL || strcmp(ofw_bus_get_name(dev),
	    "interrupt-controller") != 0)
		return (ENXIO);

	if (!ofw_bus_is_compatible(dev, "ibm,ppc-xics"))
		return (ENXIO);

	device_set_desc(dev, "PAPR virtual interrupt source");
	return (BUS_PROBE_GENERIC);
}

static int
xicp_attach(device_t dev)
{
	struct xicp_softc *sc = device_get_softc(dev);
	phandle_t phandle = ofw_bus_get_node(dev);

	mtx_init(&sc->sc_mtx, "XICP", NULL, MTX_DEF);
	sc->nintvecs = 0;

	sc->ibm_int_on = rtas_token_lookup("ibm,int-on");
	sc->ibm_int_off = rtas_token_lookup("ibm,int-off");
	sc->ibm_set_xive = rtas_token_lookup("ibm,set-xive");
	sc->ibm_get_xive = rtas_token_lookup("ibm,get-xive");

	powerpc_register_pic(dev, OF_xref_from_node(phandle), MAX_XICP_IRQS,
	    1 /* Number of IPIs */, FALSE);
	root_pic = dev;

	return (0);
}

static int
xics_attach(device_t dev)
{
	phandle_t phandle = ofw_bus_get_node(dev);

	/* The XICP (root PIC) will handle all our interrupts */
	powerpc_register_pic(root_pic, OF_xref_from_node(phandle),
	    MAX_XICP_IRQS, 1 /* Number of IPIs */, FALSE);

	return (0);
}

/*
 * PIC I/F methods.
 */

static void
xicp_bind(device_t dev, u_int irq, cpuset_t cpumask)
{
	struct xicp_softc *sc = device_get_softc(dev);
	cell_t status, cpu;
	int ncpus, i, error;

	/*
	 * This doesn't appear to actually support affinity groups, so pick a
	 * random CPU.
	 */
	ncpus = 0;
	CPU_FOREACH(cpu)
		if (CPU_ISSET(cpu, &cpumask)) ncpus++;

	i = mftb() % ncpus;
	ncpus = 0;
	CPU_FOREACH(cpu) {
		if (!CPU_ISSET(cpu, &cpumask))
			continue;
		if (ncpus == i)
			break;
		ncpus++;
	}
	

	error = rtas_call_method(sc->ibm_set_xive, 3, 1, irq, cpu,
	    XICP_PRIORITY, &status);
	if (error < 0)
		panic("Cannot bind interrupt %d to CPU %d", irq, cpu);
}

static void
xicp_dispatch(device_t dev, struct trapframe *tf)
{
	struct xicp_softc *sc;
	uint64_t xirr, junk;
	int i;

	sc = device_get_softc(dev);
	for (;;) {
		/* Return value in R4, use the PFT call */
		phyp_pft_hcall(H_XIRR, 0, 0, 0, 0, &xirr, &junk, &junk);
		xirr &= 0x00ffffff;

		if (xirr == 0) { /* No more pending interrupts? */
			phyp_hcall(H_CPPR, (uint64_t)0xff);
			break;
		}
		if (xirr == XICP_IPI) {		/* Magic number for IPIs */
			xirr = MAX_XICP_IRQS;	/* Map to FreeBSD magic */
			phyp_hcall(H_IPI, (uint64_t)(PCPU_GET(cpuid)),
			    0xff); /* Clear IPI */
		}

		/* XXX: super inefficient */
		for (i = 0; i < sc->nintvecs; i++) {
			if (sc->intvecs[i].irq == xirr)
				break;
		}

		KASSERT(i < sc->nintvecs, ("Unmapped XIRR"));
		powerpc_dispatch_intr(sc->intvecs[i].vector, tf);
	}
}

static void
xicp_enable(device_t dev, u_int irq, u_int vector)
{
	struct xicp_softc *sc;
	cell_t status, cpu;

	sc = device_get_softc(dev);

	KASSERT(sc->nintvecs + 1 < nitems(sc->intvecs),
		("Too many XICP interrupts"));

	mtx_lock(&sc->sc_mtx);
	sc->intvecs[sc->nintvecs].irq = irq;
	sc->intvecs[sc->nintvecs].vector = vector;
	mb();
	sc->nintvecs++;
	mtx_unlock(&sc->sc_mtx);

	/* IPIs are also enabled */
	if (irq == MAX_XICP_IRQS)
		return;

	/* Bind to this CPU to start: distrib. ID is last entry in gserver# */
	cpu = PCPU_GET(cpuid);
	rtas_call_method(sc->ibm_set_xive, 3, 1, irq, cpu, XICP_PRIORITY,
	    &status);
	xicp_unmask(dev, irq);
}

static void
xicp_eoi(device_t dev, u_int irq)
{
	uint64_t xirr;

	if (irq == MAX_XICP_IRQS) /* Remap IPI interrupt to internal value */
		irq = XICP_IPI;
	xirr = irq | (XICP_PRIORITY << 24);

	phyp_hcall(H_EOI, xirr);
}

static void
xicp_ipi(device_t dev, u_int cpu)
{

	phyp_hcall(H_IPI, (uint64_t)cpu, XICP_PRIORITY);
}

static void
xicp_mask(device_t dev, u_int irq)
{
	struct xicp_softc *sc = device_get_softc(dev);
	cell_t status;

	if (irq == MAX_XICP_IRQS)
		return;

	rtas_call_method(sc->ibm_int_off, 1, 1, irq, &status);
}

static void
xicp_unmask(device_t dev, u_int irq)
{
	struct xicp_softc *sc = device_get_softc(dev);
	cell_t status;

	if (irq == MAX_XICP_IRQS)
		return;

	rtas_call_method(sc->ibm_int_on, 1, 1, irq, &status);
}

OpenPOWER on IntegriCloud