blob: aa85881d17b23f7ff6425be0140b6aed0c63c942 [file] [log] [blame]
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001/*
2 * Xen event channels
3 *
4 * Xen models interrupts with abstract event channels. Because each
5 * domain gets 1024 event channels, but NR_IRQ is not that large, we
6 * must dynamically map irqs<->event channels. The event channels
7 * interface with the rest of the kernel by defining a xen interrupt
Lucas De Marchi25985ed2011-03-30 22:57:33 -03008 * chip. When an event is received, it is mapped to an irq and sent
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07009 * through the normal interrupt processing path.
10 *
11 * There are four kinds of events which can be mapped to an event
12 * channel:
13 *
14 * 1. Inter-domain notifications. This includes all the virtual
15 * device events, since they're driven by front-ends in another domain
16 * (typically dom0).
17 * 2. VIRQs, typically used for timers. These are per-cpu events.
18 * 3. IPIs.
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -040019 * 4. PIRQs - Hardware interrupts.
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -070020 *
21 * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
22 */
23
24#include <linux/linkage.h>
25#include <linux/interrupt.h>
26#include <linux/irq.h>
27#include <linux/module.h>
28#include <linux/string.h>
Christophe Saout28e08862009-01-11 11:46:23 -080029#include <linux/bootmem.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090030#include <linux/slab.h>
Jeremy Fitzhardingeb21ddbf2010-06-07 16:28:49 -040031#include <linux/irqnr.h>
Qing Hef731e3ef2010-10-11 15:30:09 +010032#include <linux/pci.h>
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -070033
Stefano Stabellini0ec53ec2012-09-14 13:37:32 +000034#ifdef CONFIG_X86
Sheng Yang38e20b02010-05-14 12:40:51 +010035#include <asm/desc.h>
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -070036#include <asm/ptrace.h>
37#include <asm/irq.h>
Jeremy Fitzhardinge792dc4f2009-02-06 14:09:43 -080038#include <asm/idle.h>
Konrad Rzeszutek Wilk0794bfc2010-10-18 10:41:08 -040039#include <asm/io_apic.h>
Stefano Stabellini9846ff12012-01-30 16:21:48 +000040#include <asm/xen/page.h>
Stefano Stabellini42a1de52010-06-24 16:42:04 +010041#include <asm/xen/pci.h>
Stefano Stabellini0ec53ec2012-09-14 13:37:32 +000042#endif
43#include <asm/sync_bitops.h>
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -070044#include <asm/xen/hypercall.h>
Adrian Bunk8d1b8752007-07-20 00:31:44 -070045#include <asm/xen/hypervisor.h>
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -070046
Sheng Yang38e20b02010-05-14 12:40:51 +010047#include <xen/xen.h>
48#include <xen/hvm.h>
Isaku Yamahatae04d0d02008-04-02 10:53:55 -070049#include <xen/xen-ops.h>
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -070050#include <xen/events.h>
51#include <xen/interface/xen.h>
52#include <xen/interface/event_channel.h>
Sheng Yang38e20b02010-05-14 12:40:51 +010053#include <xen/interface/hvm/hvm_op.h>
54#include <xen/interface/hvm/params.h>
Stefano Stabellini0ec53ec2012-09-14 13:37:32 +000055#include <xen/interface/physdev.h>
56#include <xen/interface/sched.h>
57#include <asm/hw_irq.h>
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -070058
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -070059/*
60 * This lock protects updates to the following mapping and reference-count
61 * arrays. The lock does not need to be acquired to read the mapping tables.
62 */
Konrad Rzeszutek Wilk77365942011-09-14 05:10:00 -040063static DEFINE_MUTEX(irq_mapping_update_lock);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -070064
Ian Campbell6cb65372011-03-10 16:08:11 +000065static LIST_HEAD(xen_irq_list_head);
66
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -070067/* IRQ <-> VIRQ mapping. */
Tejun Heo204fba42009-06-24 15:13:45 +090068static DEFINE_PER_CPU(int [NR_VIRQS], virq_to_irq) = {[0 ... NR_VIRQS-1] = -1};
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -070069
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -070070/* IRQ <-> IPI mapping */
Tejun Heo204fba42009-06-24 15:13:45 +090071static DEFINE_PER_CPU(int [XEN_NR_IPIS], ipi_to_irq) = {[0 ... XEN_NR_IPIS-1] = -1};
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -070072
Jeremy Fitzhardingeced40d02009-02-06 14:09:44 -080073/* Interrupt types. */
74enum xen_irq_type {
Jeremy Fitzhardinged77bbd42009-02-06 14:09:45 -080075 IRQT_UNBOUND = 0,
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -070076 IRQT_PIRQ,
77 IRQT_VIRQ,
78 IRQT_IPI,
79 IRQT_EVTCHN
80};
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -070081
Jeremy Fitzhardingeced40d02009-02-06 14:09:44 -080082/*
83 * Packed IRQ information:
84 * type - enum xen_irq_type
85 * event channel - irq->event channel mapping
86 * cpu - cpu this event channel is bound to
87 * index - type-specific information:
Stefano Stabellini42a1de52010-06-24 16:42:04 +010088 * PIRQ - vector, with MSB being "needs EIO", or physical IRQ of the HVM
89 * guest, or GSI (real passthrough IRQ) of the device.
Jeremy Fitzhardingeced40d02009-02-06 14:09:44 -080090 * VIRQ - virq number
91 * IPI - IPI vector
92 * EVTCHN -
93 */
Ruslan Pisarev088c05a2011-07-26 14:16:13 +030094struct irq_info {
Ian Campbell6cb65372011-03-10 16:08:11 +000095 struct list_head list;
Daniel De Graaf420eb552011-10-27 17:58:47 -040096 int refcnt;
Jeremy Fitzhardingeced40d02009-02-06 14:09:44 -080097 enum xen_irq_type type; /* type */
Ian Campbell6cb65372011-03-10 16:08:11 +000098 unsigned irq;
Jeremy Fitzhardingeced40d02009-02-06 14:09:44 -080099 unsigned short evtchn; /* event channel */
100 unsigned short cpu; /* cpu bound */
101
102 union {
103 unsigned short virq;
104 enum ipi_vector ipi;
105 struct {
Stefano Stabellini7a043f12010-07-01 17:08:14 +0100106 unsigned short pirq;
Jeremy Fitzhardingeced40d02009-02-06 14:09:44 -0800107 unsigned short gsi;
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400108 unsigned char vector;
109 unsigned char flags;
Konrad Rzeszutek Wilkbeafbdc2011-04-14 11:17:36 -0400110 uint16_t domid;
Jeremy Fitzhardingeced40d02009-02-06 14:09:44 -0800111 } pirq;
112 } u;
113};
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400114#define PIRQ_NEEDS_EOI (1 << 0)
Konrad Rzeszutek Wilk15ebbb82010-10-04 13:43:27 -0400115#define PIRQ_SHAREABLE (1 << 1)
Jeremy Fitzhardingeced40d02009-02-06 14:09:44 -0800116
Jeremy Fitzhardingeb21ddbf2010-06-07 16:28:49 -0400117static int *evtchn_to_irq;
Ian Campbellbf86ad82012-10-17 09:39:12 +0100118#ifdef CONFIG_X86
Stefano Stabellini9846ff12012-01-30 16:21:48 +0000119static unsigned long *pirq_eoi_map;
Ian Campbellbf86ad82012-10-17 09:39:12 +0100120#endif
Stefano Stabellini9846ff12012-01-30 16:21:48 +0000121static bool (*pirq_needs_eoi)(unsigned irq);
Jeremy Fitzhardinge3b32f572009-08-13 12:50:37 -0700122
Ian Campbellc81611c2013-02-20 11:48:06 +0000123/*
124 * Note sizeof(xen_ulong_t) can be more than sizeof(unsigned long). Be
125 * careful to only use bitops which allow for this (e.g
126 * test_bit/find_first_bit and friends but not __ffs) and to pass
127 * BITS_PER_EVTCHN_WORD as the bitmask length.
128 */
129#define BITS_PER_EVTCHN_WORD (sizeof(xen_ulong_t)*8)
130/*
131 * Make a bitmask (i.e. unsigned long *) of a xen_ulong_t
132 * array. Primarily to avoid long lines (hence the terse name).
133 */
134#define BM(x) (unsigned long *)(x)
135/* Find the first set bit in a evtchn mask */
136#define EVTCHN_FIRST_BIT(w) find_first_bit(BM(&(w)), BITS_PER_EVTCHN_WORD)
137
138static DEFINE_PER_CPU(xen_ulong_t [NR_EVENT_CHANNELS/BITS_PER_EVTCHN_WORD],
Ian Campbellcb60d112011-03-10 16:08:08 +0000139 cpu_evtchn_mask);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700140
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700141/* Xen will never allocate port zero for any purpose. */
142#define VALID_EVTCHN(chn) ((chn) != 0)
143
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700144static struct irq_chip xen_dynamic_chip;
Jeremy Fitzhardingeaaca4962010-08-20 18:57:53 -0700145static struct irq_chip xen_percpu_chip;
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400146static struct irq_chip xen_pirq_chip;
Stefano Stabellini7e186bd2011-05-06 12:27:50 +0100147static void enable_dynirq(struct irq_data *data);
148static void disable_dynirq(struct irq_data *data);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700149
Ian Campbell9158c352011-03-10 16:08:09 +0000150/* Get info for IRQ */
Jeremy Fitzhardingeced40d02009-02-06 14:09:44 -0800151static struct irq_info *info_for_irq(unsigned irq)
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700152{
Thomas Gleixnerc442b802011-03-25 10:58:06 +0100153 return irq_get_handler_data(irq);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700154}
155
Ian Campbell9158c352011-03-10 16:08:09 +0000156/* Constructors for packed IRQ information. */
157static void xen_irq_info_common_init(struct irq_info *info,
Ian Campbell3d4cfa32011-03-10 16:08:10 +0000158 unsigned irq,
Ian Campbell9158c352011-03-10 16:08:09 +0000159 enum xen_irq_type type,
160 unsigned short evtchn,
161 unsigned short cpu)
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700162{
Ian Campbell9158c352011-03-10 16:08:09 +0000163
164 BUG_ON(info->type != IRQT_UNBOUND && info->type != type);
165
166 info->type = type;
Ian Campbell6cb65372011-03-10 16:08:11 +0000167 info->irq = irq;
Ian Campbell9158c352011-03-10 16:08:09 +0000168 info->evtchn = evtchn;
169 info->cpu = cpu;
Ian Campbell3d4cfa32011-03-10 16:08:10 +0000170
171 evtchn_to_irq[evtchn] = irq;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700172}
173
Ian Campbell9158c352011-03-10 16:08:09 +0000174static void xen_irq_info_evtchn_init(unsigned irq,
175 unsigned short evtchn)
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700176{
Ian Campbell9158c352011-03-10 16:08:09 +0000177 struct irq_info *info = info_for_irq(irq);
178
Ian Campbell3d4cfa32011-03-10 16:08:10 +0000179 xen_irq_info_common_init(info, irq, IRQT_EVTCHN, evtchn, 0);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700180}
181
Ian Campbell3d4cfa32011-03-10 16:08:10 +0000182static void xen_irq_info_ipi_init(unsigned cpu,
183 unsigned irq,
Ian Campbell9158c352011-03-10 16:08:09 +0000184 unsigned short evtchn,
185 enum ipi_vector ipi)
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700186{
Ian Campbell9158c352011-03-10 16:08:09 +0000187 struct irq_info *info = info_for_irq(irq);
188
Ian Campbell3d4cfa32011-03-10 16:08:10 +0000189 xen_irq_info_common_init(info, irq, IRQT_IPI, evtchn, 0);
Ian Campbell9158c352011-03-10 16:08:09 +0000190
191 info->u.ipi = ipi;
Ian Campbell3d4cfa32011-03-10 16:08:10 +0000192
193 per_cpu(ipi_to_irq, cpu)[ipi] = irq;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700194}
195
Ian Campbell3d4cfa32011-03-10 16:08:10 +0000196static void xen_irq_info_virq_init(unsigned cpu,
197 unsigned irq,
Ian Campbell9158c352011-03-10 16:08:09 +0000198 unsigned short evtchn,
199 unsigned short virq)
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700200{
Ian Campbell9158c352011-03-10 16:08:09 +0000201 struct irq_info *info = info_for_irq(irq);
202
Ian Campbell3d4cfa32011-03-10 16:08:10 +0000203 xen_irq_info_common_init(info, irq, IRQT_VIRQ, evtchn, 0);
Ian Campbell9158c352011-03-10 16:08:09 +0000204
205 info->u.virq = virq;
Ian Campbell3d4cfa32011-03-10 16:08:10 +0000206
207 per_cpu(virq_to_irq, cpu)[virq] = irq;
Ian Campbell9158c352011-03-10 16:08:09 +0000208}
209
210static void xen_irq_info_pirq_init(unsigned irq,
211 unsigned short evtchn,
212 unsigned short pirq,
213 unsigned short gsi,
214 unsigned short vector,
Konrad Rzeszutek Wilkbeafbdc2011-04-14 11:17:36 -0400215 uint16_t domid,
Ian Campbell9158c352011-03-10 16:08:09 +0000216 unsigned char flags)
217{
218 struct irq_info *info = info_for_irq(irq);
219
Ian Campbell3d4cfa32011-03-10 16:08:10 +0000220 xen_irq_info_common_init(info, irq, IRQT_PIRQ, evtchn, 0);
Ian Campbell9158c352011-03-10 16:08:09 +0000221
222 info->u.pirq.pirq = pirq;
223 info->u.pirq.gsi = gsi;
224 info->u.pirq.vector = vector;
Konrad Rzeszutek Wilkbeafbdc2011-04-14 11:17:36 -0400225 info->u.pirq.domid = domid;
Ian Campbell9158c352011-03-10 16:08:09 +0000226 info->u.pirq.flags = flags;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700227}
228
229/*
230 * Accessors for packed IRQ information.
231 */
Jeremy Fitzhardingeced40d02009-02-06 14:09:44 -0800232static unsigned int evtchn_from_irq(unsigned irq)
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700233{
Joe Jin110e7c72011-01-07 14:50:12 +0800234 if (unlikely(WARN(irq < 0 || irq >= nr_irqs, "Invalid irq %d!\n", irq)))
235 return 0;
236
Jeremy Fitzhardingeced40d02009-02-06 14:09:44 -0800237 return info_for_irq(irq)->evtchn;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700238}
239
Ian Campbelld4c04532009-02-06 19:20:31 -0800240unsigned irq_from_evtchn(unsigned int evtchn)
241{
242 return evtchn_to_irq[evtchn];
243}
244EXPORT_SYMBOL_GPL(irq_from_evtchn);
245
Jeremy Fitzhardingeced40d02009-02-06 14:09:44 -0800246static enum ipi_vector ipi_from_irq(unsigned irq)
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700247{
Jeremy Fitzhardingeced40d02009-02-06 14:09:44 -0800248 struct irq_info *info = info_for_irq(irq);
249
250 BUG_ON(info == NULL);
251 BUG_ON(info->type != IRQT_IPI);
252
253 return info->u.ipi;
254}
255
256static unsigned virq_from_irq(unsigned irq)
257{
258 struct irq_info *info = info_for_irq(irq);
259
260 BUG_ON(info == NULL);
261 BUG_ON(info->type != IRQT_VIRQ);
262
263 return info->u.virq;
264}
265
Stefano Stabellini7a043f12010-07-01 17:08:14 +0100266static unsigned pirq_from_irq(unsigned irq)
267{
268 struct irq_info *info = info_for_irq(irq);
269
270 BUG_ON(info == NULL);
271 BUG_ON(info->type != IRQT_PIRQ);
272
273 return info->u.pirq.pirq;
274}
275
Jeremy Fitzhardingeced40d02009-02-06 14:09:44 -0800276static enum xen_irq_type type_from_irq(unsigned irq)
277{
278 return info_for_irq(irq)->type;
279}
280
281static unsigned cpu_from_irq(unsigned irq)
282{
283 return info_for_irq(irq)->cpu;
284}
285
286static unsigned int cpu_from_evtchn(unsigned int evtchn)
287{
288 int irq = evtchn_to_irq[evtchn];
289 unsigned ret = 0;
290
291 if (irq != -1)
292 ret = cpu_from_irq(irq);
293
294 return ret;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700295}
296
Ian Campbellbf86ad82012-10-17 09:39:12 +0100297#ifdef CONFIG_X86
Stefano Stabellini9846ff12012-01-30 16:21:48 +0000298static bool pirq_check_eoi_map(unsigned irq)
299{
Stefano Stabellini521394e2012-04-25 16:11:38 +0100300 return test_bit(pirq_from_irq(irq), pirq_eoi_map);
Stefano Stabellini9846ff12012-01-30 16:21:48 +0000301}
Ian Campbellbf86ad82012-10-17 09:39:12 +0100302#endif
Stefano Stabellini9846ff12012-01-30 16:21:48 +0000303
304static bool pirq_needs_eoi_flag(unsigned irq)
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400305{
306 struct irq_info *info = info_for_irq(irq);
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400307 BUG_ON(info->type != IRQT_PIRQ);
308
309 return info->u.pirq.flags & PIRQ_NEEDS_EOI;
310}
311
Ian Campbellc81611c2013-02-20 11:48:06 +0000312static inline xen_ulong_t active_evtchns(unsigned int cpu,
313 struct shared_info *sh,
314 unsigned int idx)
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700315{
Ruslan Pisarev088c05a2011-07-26 14:16:13 +0300316 return sh->evtchn_pending[idx] &
Ian Campbellcb60d112011-03-10 16:08:08 +0000317 per_cpu(cpu_evtchn_mask, cpu)[idx] &
Ruslan Pisarev088c05a2011-07-26 14:16:13 +0300318 ~sh->evtchn_mask[idx];
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700319}
320
321static void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu)
322{
323 int irq = evtchn_to_irq[chn];
324
325 BUG_ON(irq == -1);
326#ifdef CONFIG_SMP
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +0000327 cpumask_copy(irq_to_desc(irq)->irq_data.affinity, cpumask_of(cpu));
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700328#endif
329
Ian Campbellc81611c2013-02-20 11:48:06 +0000330 clear_bit(chn, BM(per_cpu(cpu_evtchn_mask, cpu_from_irq(irq))));
331 set_bit(chn, BM(per_cpu(cpu_evtchn_mask, cpu)));
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700332
Ian Campbellca62ce82011-03-10 16:08:12 +0000333 info_for_irq(irq)->cpu = cpu;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700334}
335
336static void init_evtchn_cpu_bindings(void)
337{
Jan Beulich1c6969e2010-11-16 14:55:33 -0800338 int i;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700339#ifdef CONFIG_SMP
Ian Campbell6cb65372011-03-10 16:08:11 +0000340 struct irq_info *info;
Thomas Gleixner10e58082008-10-16 14:19:04 +0200341
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700342 /* By default all event channels notify CPU#0. */
Ian Campbell6cb65372011-03-10 16:08:11 +0000343 list_for_each_entry(info, &xen_irq_list_head, list) {
344 struct irq_desc *desc = irq_to_desc(info->irq);
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +0000345 cpumask_copy(desc->irq_data.affinity, cpumask_of(0));
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800346 }
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700347#endif
348
Jan Beulich1c6969e2010-11-16 14:55:33 -0800349 for_each_possible_cpu(i)
Ian Campbellcb60d112011-03-10 16:08:08 +0000350 memset(per_cpu(cpu_evtchn_mask, i),
351 (i == 0) ? ~0 : 0, sizeof(*per_cpu(cpu_evtchn_mask, i)));
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700352}
353
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700354static inline void clear_evtchn(int port)
355{
356 struct shared_info *s = HYPERVISOR_shared_info;
Ian Campbellc81611c2013-02-20 11:48:06 +0000357 sync_clear_bit(port, BM(&s->evtchn_pending[0]));
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700358}
359
360static inline void set_evtchn(int port)
361{
362 struct shared_info *s = HYPERVISOR_shared_info;
Ian Campbellc81611c2013-02-20 11:48:06 +0000363 sync_set_bit(port, BM(&s->evtchn_pending[0]));
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700364}
365
Jeremy Fitzhardinge168d2f42008-08-20 17:02:18 -0700366static inline int test_evtchn(int port)
367{
368 struct shared_info *s = HYPERVISOR_shared_info;
Ian Campbellc81611c2013-02-20 11:48:06 +0000369 return sync_test_bit(port, BM(&s->evtchn_pending[0]));
Jeremy Fitzhardinge168d2f42008-08-20 17:02:18 -0700370}
371
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700372
373/**
374 * notify_remote_via_irq - send event to remote end of event channel via irq
375 * @irq: irq of event channel to send event to
376 *
377 * Unlike notify_remote_via_evtchn(), this is safe to use across
378 * save/restore. Notifications on a broken connection are silently
379 * dropped.
380 */
381void notify_remote_via_irq(int irq)
382{
383 int evtchn = evtchn_from_irq(irq);
384
385 if (VALID_EVTCHN(evtchn))
386 notify_remote_via_evtchn(evtchn);
387}
388EXPORT_SYMBOL_GPL(notify_remote_via_irq);
389
390static void mask_evtchn(int port)
391{
392 struct shared_info *s = HYPERVISOR_shared_info;
Ian Campbellc81611c2013-02-20 11:48:06 +0000393 sync_set_bit(port, BM(&s->evtchn_mask[0]));
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700394}
395
396static void unmask_evtchn(int port)
397{
398 struct shared_info *s = HYPERVISOR_shared_info;
399 unsigned int cpu = get_cpu();
Stefano Stabellinib5e57922012-08-22 17:20:11 +0100400 int do_hypercall = 0, evtchn_pending = 0;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700401
402 BUG_ON(!irqs_disabled());
403
Stefano Stabellinib5e57922012-08-22 17:20:11 +0100404 if (unlikely((cpu != cpu_from_evtchn(port))))
405 do_hypercall = 1;
David Vrabelc26377e2013-03-25 14:11:19 +0000406 else {
407 /*
408 * Need to clear the mask before checking pending to
409 * avoid a race with an event becoming pending.
410 *
411 * EVTCHNOP_unmask will only trigger an upcall if the
412 * mask bit was set, so if a hypercall is needed
413 * remask the event.
414 */
415 sync_clear_bit(port, BM(&s->evtchn_mask[0]));
Ian Campbellc81611c2013-02-20 11:48:06 +0000416 evtchn_pending = sync_test_bit(port, BM(&s->evtchn_pending[0]));
Stefano Stabellinib5e57922012-08-22 17:20:11 +0100417
David Vrabelc26377e2013-03-25 14:11:19 +0000418 if (unlikely(evtchn_pending && xen_hvm_domain())) {
419 sync_set_bit(port, BM(&s->evtchn_mask[0]));
420 do_hypercall = 1;
421 }
422 }
Stefano Stabellinib5e57922012-08-22 17:20:11 +0100423
424 /* Slow path (hypercall) if this is a non-local port or if this is
425 * an hvm domain and an event is pending (hvm domains don't have
426 * their own implementation of irq_enable). */
427 if (do_hypercall) {
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700428 struct evtchn_unmask unmask = { .port = port };
429 (void)HYPERVISOR_event_channel_op(EVTCHNOP_unmask, &unmask);
430 } else {
Christoph Lameter780f36d2010-12-06 11:16:29 -0600431 struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700432
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700433 /*
434 * The following is basically the equivalent of
435 * 'hw_resend_irq'. Just like a real IO-APIC we 'lose
436 * the interrupt edge' if the channel is masked.
437 */
Stefano Stabellinib5e57922012-08-22 17:20:11 +0100438 if (evtchn_pending &&
Ian Campbellc81611c2013-02-20 11:48:06 +0000439 !sync_test_and_set_bit(port / BITS_PER_EVTCHN_WORD,
440 BM(&vcpu_info->evtchn_pending_sel)))
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700441 vcpu_info->evtchn_upcall_pending = 1;
442 }
443
444 put_cpu();
445}
446
Ian Campbell6cb65372011-03-10 16:08:11 +0000447static void xen_irq_init(unsigned irq)
448{
449 struct irq_info *info;
Konrad Rzeszutek Wilkb5328cd2011-06-15 14:24:29 -0400450#ifdef CONFIG_SMP
Ian Campbell6cb65372011-03-10 16:08:11 +0000451 struct irq_desc *desc = irq_to_desc(irq);
452
453 /* By default all event channels notify CPU#0. */
454 cpumask_copy(desc->irq_data.affinity, cpumask_of(0));
Konrad Rzeszutek Wilk44626e42011-03-15 16:40:33 -0400455#endif
Ian Campbell6cb65372011-03-10 16:08:11 +0000456
Ian Campbellca62ce82011-03-10 16:08:12 +0000457 info = kzalloc(sizeof(*info), GFP_KERNEL);
458 if (info == NULL)
459 panic("Unable to allocate metadata for IRQ%d\n", irq);
Ian Campbell6cb65372011-03-10 16:08:11 +0000460
461 info->type = IRQT_UNBOUND;
Daniel De Graaf420eb552011-10-27 17:58:47 -0400462 info->refcnt = -1;
Ian Campbell6cb65372011-03-10 16:08:11 +0000463
Thomas Gleixnerc442b802011-03-25 10:58:06 +0100464 irq_set_handler_data(irq, info);
Ian Campbellca62ce82011-03-10 16:08:12 +0000465
Ian Campbell6cb65372011-03-10 16:08:11 +0000466 list_add_tail(&info->list, &xen_irq_list_head);
467}
468
Ian Campbell7bee9762011-03-10 16:08:15 +0000469static int __must_check xen_allocate_irq_dynamic(void)
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700470{
Ian Campbell89911502011-03-03 11:57:44 -0500471 int first = 0;
472 int irq;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700473
Ian Campbell89911502011-03-03 11:57:44 -0500474#ifdef CONFIG_X86_IO_APIC
475 /*
476 * For an HVM guest or domain 0 which see "real" (emulated or
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300477 * actual respectively) GSIs we allocate dynamic IRQs
Ian Campbell89911502011-03-03 11:57:44 -0500478 * e.g. those corresponding to event channels or MSIs
479 * etc. from the range above those "real" GSIs to avoid
480 * collisions.
Konrad Rzeszutek Wilkd1b758e2010-12-09 14:53:29 -0500481 */
Ian Campbell89911502011-03-03 11:57:44 -0500482 if (xen_initial_domain() || xen_hvm_domain())
483 first = get_nr_irqs_gsi();
484#endif
485
Ian Campbell89911502011-03-03 11:57:44 -0500486 irq = irq_alloc_desc_from(first, -1);
487
Konrad Rzeszutek Wilke6599222011-09-29 13:26:45 -0400488 if (irq >= 0)
489 xen_irq_init(irq);
Jeremy Fitzhardingeced40d02009-02-06 14:09:44 -0800490
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700491 return irq;
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400492}
493
Ian Campbell7bee9762011-03-10 16:08:15 +0000494static int __must_check xen_allocate_irq_gsi(unsigned gsi)
Ian Campbellc9df1ce2011-01-11 17:20:15 +0000495{
496 int irq;
497
Ian Campbell89911502011-03-03 11:57:44 -0500498 /*
499 * A PV guest has no concept of a GSI (since it has no ACPI
500 * nor access to/knowledge of the physical APICs). Therefore
501 * all IRQs are dynamically allocated from the entire IRQ
502 * space.
503 */
504 if (xen_pv_domain() && !xen_initial_domain())
Ian Campbellc9df1ce2011-01-11 17:20:15 +0000505 return xen_allocate_irq_dynamic();
506
507 /* Legacy IRQ descriptors are already allocated by the arch. */
508 if (gsi < NR_IRQS_LEGACY)
Ian Campbell6cb65372011-03-10 16:08:11 +0000509 irq = gsi;
510 else
511 irq = irq_alloc_desc_at(gsi, -1);
Ian Campbellc9df1ce2011-01-11 17:20:15 +0000512
Ian Campbell6cb65372011-03-10 16:08:11 +0000513 xen_irq_init(irq);
Ian Campbellc9df1ce2011-01-11 17:20:15 +0000514
515 return irq;
516}
517
518static void xen_free_irq(unsigned irq)
519{
Thomas Gleixnerc442b802011-03-25 10:58:06 +0100520 struct irq_info *info = irq_get_handler_data(irq);
Ian Campbell6cb65372011-03-10 16:08:11 +0000521
522 list_del(&info->list);
Ian Campbell9158c352011-03-10 16:08:09 +0000523
Thomas Gleixnerc442b802011-03-25 10:58:06 +0100524 irq_set_handler_data(irq, NULL);
Ian Campbellca62ce82011-03-10 16:08:12 +0000525
Daniel De Graaf420eb552011-10-27 17:58:47 -0400526 WARN_ON(info->refcnt > 0);
527
Ian Campbellca62ce82011-03-10 16:08:12 +0000528 kfree(info);
529
Ian Campbell72146102011-02-03 09:49:35 +0000530 /* Legacy IRQ descriptors are managed by the arch. */
531 if (irq < NR_IRQS_LEGACY)
532 return;
533
Ian Campbellc9df1ce2011-01-11 17:20:15 +0000534 irq_free_desc(irq);
535}
536
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400537static void pirq_query_unmask(int irq)
538{
539 struct physdev_irq_status_query irq_status;
540 struct irq_info *info = info_for_irq(irq);
541
542 BUG_ON(info->type != IRQT_PIRQ);
543
Stefano Stabellini7a043f12010-07-01 17:08:14 +0100544 irq_status.irq = pirq_from_irq(irq);
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400545 if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status))
546 irq_status.flags = 0;
547
548 info->u.pirq.flags &= ~PIRQ_NEEDS_EOI;
549 if (irq_status.flags & XENIRQSTAT_needs_eoi)
550 info->u.pirq.flags |= PIRQ_NEEDS_EOI;
551}
552
553static bool probing_irq(int irq)
554{
555 struct irq_desc *desc = irq_to_desc(irq);
556
557 return desc && desc->action == NULL;
558}
559
Stefano Stabellini7e186bd2011-05-06 12:27:50 +0100560static void eoi_pirq(struct irq_data *data)
561{
562 int evtchn = evtchn_from_irq(data->irq);
563 struct physdev_eoi eoi = { .irq = pirq_from_irq(data->irq) };
564 int rc = 0;
565
566 irq_move_irq(data);
567
568 if (VALID_EVTCHN(evtchn))
569 clear_evtchn(evtchn);
570
571 if (pirq_needs_eoi(data->irq)) {
572 rc = HYPERVISOR_physdev_op(PHYSDEVOP_eoi, &eoi);
573 WARN_ON(rc);
574 }
575}
576
577static void mask_ack_pirq(struct irq_data *data)
578{
579 disable_dynirq(data);
580 eoi_pirq(data);
581}
582
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +0000583static unsigned int __startup_pirq(unsigned int irq)
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400584{
585 struct evtchn_bind_pirq bind_pirq;
586 struct irq_info *info = info_for_irq(irq);
587 int evtchn = evtchn_from_irq(irq);
Konrad Rzeszutek Wilk15ebbb82010-10-04 13:43:27 -0400588 int rc;
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400589
590 BUG_ON(info->type != IRQT_PIRQ);
591
592 if (VALID_EVTCHN(evtchn))
593 goto out;
594
Stefano Stabellini7a043f12010-07-01 17:08:14 +0100595 bind_pirq.pirq = pirq_from_irq(irq);
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400596 /* NB. We are happy to share unless we are probing. */
Konrad Rzeszutek Wilk15ebbb82010-10-04 13:43:27 -0400597 bind_pirq.flags = info->u.pirq.flags & PIRQ_SHAREABLE ?
598 BIND_PIRQ__WILL_SHARE : 0;
599 rc = HYPERVISOR_event_channel_op(EVTCHNOP_bind_pirq, &bind_pirq);
600 if (rc != 0) {
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400601 if (!probing_irq(irq))
602 printk(KERN_INFO "Failed to obtain physical IRQ %d\n",
603 irq);
604 return 0;
605 }
606 evtchn = bind_pirq.port;
607
608 pirq_query_unmask(irq);
609
610 evtchn_to_irq[evtchn] = irq;
611 bind_evtchn_to_cpu(evtchn, 0);
612 info->evtchn = evtchn;
613
614out:
615 unmask_evtchn(evtchn);
Stefano Stabellini7e186bd2011-05-06 12:27:50 +0100616 eoi_pirq(irq_get_irq_data(irq));
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400617
618 return 0;
619}
620
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +0000621static unsigned int startup_pirq(struct irq_data *data)
622{
623 return __startup_pirq(data->irq);
624}
625
626static void shutdown_pirq(struct irq_data *data)
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400627{
628 struct evtchn_close close;
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +0000629 unsigned int irq = data->irq;
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400630 struct irq_info *info = info_for_irq(irq);
631 int evtchn = evtchn_from_irq(irq);
632
633 BUG_ON(info->type != IRQT_PIRQ);
634
635 if (!VALID_EVTCHN(evtchn))
636 return;
637
638 mask_evtchn(evtchn);
639
640 close.port = evtchn;
641 if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
642 BUG();
643
644 bind_evtchn_to_cpu(evtchn, 0);
645 evtchn_to_irq[evtchn] = -1;
646 info->evtchn = 0;
647}
648
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +0000649static void enable_pirq(struct irq_data *data)
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400650{
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +0000651 startup_pirq(data);
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400652}
653
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +0000654static void disable_pirq(struct irq_data *data)
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400655{
Stefano Stabellini7e186bd2011-05-06 12:27:50 +0100656 disable_dynirq(data);
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400657}
658
Stefano Stabellini68c2c392012-05-21 16:54:10 +0100659int xen_irq_from_gsi(unsigned gsi)
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400660{
Ian Campbell6cb65372011-03-10 16:08:11 +0000661 struct irq_info *info;
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400662
Ian Campbell6cb65372011-03-10 16:08:11 +0000663 list_for_each_entry(info, &xen_irq_list_head, list) {
664 if (info->type != IRQT_PIRQ)
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400665 continue;
666
Ian Campbell6cb65372011-03-10 16:08:11 +0000667 if (info->u.pirq.gsi == gsi)
668 return info->irq;
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400669 }
670
671 return -1;
672}
Stefano Stabellini68c2c392012-05-21 16:54:10 +0100673EXPORT_SYMBOL_GPL(xen_irq_from_gsi);
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400674
Ian Campbell653378a2011-03-10 16:08:04 +0000675/*
676 * Do not make any assumptions regarding the relationship between the
677 * IRQ number returned here and the Xen pirq argument.
Stefano Stabellini7a043f12010-07-01 17:08:14 +0100678 *
679 * Note: We don't assign an event channel until the irq actually started
680 * up. Return an existing irq if we've already got one for the gsi.
Stefano Stabellinie5ac0bd2011-05-25 12:33:23 +0100681 *
682 * Shareable implies level triggered, not shareable implies edge
683 * triggered here.
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400684 */
Ian Campbellf4d06352011-03-10 16:08:07 +0000685int xen_bind_pirq_gsi_to_irq(unsigned gsi,
686 unsigned pirq, int shareable, char *name)
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400687{
Ian Campbella0e18112011-03-10 16:08:03 +0000688 int irq = -1;
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400689 struct physdev_irq irq_op;
690
Konrad Rzeszutek Wilk77365942011-09-14 05:10:00 -0400691 mutex_lock(&irq_mapping_update_lock);
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400692
Stefano Stabellini68c2c392012-05-21 16:54:10 +0100693 irq = xen_irq_from_gsi(gsi);
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400694 if (irq != -1) {
Stefano Stabellini7a043f12010-07-01 17:08:14 +0100695 printk(KERN_INFO "xen_map_pirq_gsi: returning irq %d for gsi %u\n",
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400696 irq, gsi);
Daniel De Graaf420eb552011-10-27 17:58:47 -0400697 goto out;
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400698 }
699
Ian Campbellc9df1ce2011-01-11 17:20:15 +0000700 irq = xen_allocate_irq_gsi(gsi);
Ian Campbell7bee9762011-03-10 16:08:15 +0000701 if (irq < 0)
702 goto out;
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400703
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400704 irq_op.irq = irq;
Alex Nixonb5401a92010-03-18 16:31:34 -0400705 irq_op.vector = 0;
706
707 /* Only the privileged domain can do this. For non-priv, the pcifront
708 * driver provides a PCI bus that does the call to do exactly
709 * this in the priv domain. */
710 if (xen_initial_domain() &&
711 HYPERVISOR_physdev_op(PHYSDEVOP_alloc_irq_vector, &irq_op)) {
Ian Campbellc9df1ce2011-01-11 17:20:15 +0000712 xen_free_irq(irq);
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400713 irq = -ENOSPC;
714 goto out;
715 }
716
Konrad Rzeszutek Wilkbeafbdc2011-04-14 11:17:36 -0400717 xen_irq_info_pirq_init(irq, 0, pirq, gsi, irq_op.vector, DOMID_SELF,
Ian Campbell9158c352011-03-10 16:08:09 +0000718 shareable ? PIRQ_SHAREABLE : 0);
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400719
Stefano Stabellini7e186bd2011-05-06 12:27:50 +0100720 pirq_query_unmask(irq);
721 /* We try to use the handler with the appropriate semantic for the
Stefano Stabellinie5ac0bd2011-05-25 12:33:23 +0100722 * type of interrupt: if the interrupt is an edge triggered
723 * interrupt we use handle_edge_irq.
Stefano Stabellini7e186bd2011-05-06 12:27:50 +0100724 *
Stefano Stabellinie5ac0bd2011-05-25 12:33:23 +0100725 * On the other hand if the interrupt is level triggered we use
726 * handle_fasteoi_irq like the native code does for this kind of
Stefano Stabellini7e186bd2011-05-06 12:27:50 +0100727 * interrupts.
Stefano Stabellinie5ac0bd2011-05-25 12:33:23 +0100728 *
Stefano Stabellini7e186bd2011-05-06 12:27:50 +0100729 * Depending on the Xen version, pirq_needs_eoi might return true
730 * not only for level triggered interrupts but for edge triggered
731 * interrupts too. In any case Xen always honors the eoi mechanism,
732 * not injecting any more pirqs of the same kind if the first one
733 * hasn't received an eoi yet. Therefore using the fasteoi handler
734 * is the right choice either way.
735 */
Stefano Stabellinie5ac0bd2011-05-25 12:33:23 +0100736 if (shareable)
Stefano Stabellini7e186bd2011-05-06 12:27:50 +0100737 irq_set_chip_and_handler_name(irq, &xen_pirq_chip,
738 handle_fasteoi_irq, name);
739 else
740 irq_set_chip_and_handler_name(irq, &xen_pirq_chip,
741 handle_edge_irq, name);
742
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400743out:
Konrad Rzeszutek Wilk77365942011-09-14 05:10:00 -0400744 mutex_unlock(&irq_mapping_update_lock);
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -0400745
746 return irq;
747}
748
Qing Hef731e3ef2010-10-11 15:30:09 +0100749#ifdef CONFIG_PCI_MSI
Ian Campbellbf480d92011-02-18 16:43:32 +0000750int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc)
Ian Campbellcbf6aa82011-01-11 17:20:14 +0000751{
Ian Campbell5cad61a2011-02-18 16:43:31 +0000752 int rc;
Ian Campbellcbf6aa82011-01-11 17:20:14 +0000753 struct physdev_get_free_pirq op_get_free_pirq;
Ian Campbell5cad61a2011-02-18 16:43:31 +0000754
Ian Campbellbf480d92011-02-18 16:43:32 +0000755 op_get_free_pirq.type = MAP_PIRQ_TYPE_MSI;
Ian Campbellcbf6aa82011-01-11 17:20:14 +0000756 rc = HYPERVISOR_physdev_op(PHYSDEVOP_get_free_pirq, &op_get_free_pirq);
Ian Campbellcbf6aa82011-01-11 17:20:14 +0000757
Ian Campbell5cad61a2011-02-18 16:43:31 +0000758 WARN_ONCE(rc == -ENOSYS,
759 "hypervisor does not support the PHYSDEVOP_get_free_pirq interface\n");
760
761 return rc ? -1 : op_get_free_pirq.pirq;
Ian Campbellcbf6aa82011-01-11 17:20:14 +0000762}
763
Ian Campbellbf480d92011-02-18 16:43:32 +0000764int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
Konrad Rzeszutek Wilkbeafbdc2011-04-14 11:17:36 -0400765 int pirq, int vector, const char *name,
766 domid_t domid)
Stefano Stabellini809f9262010-07-01 17:10:39 +0100767{
Ian Campbellbf480d92011-02-18 16:43:32 +0000768 int irq, ret;
Ian Campbell4b41df72011-02-18 16:43:29 +0000769
Konrad Rzeszutek Wilk77365942011-09-14 05:10:00 -0400770 mutex_lock(&irq_mapping_update_lock);
Stefano Stabellini809f9262010-07-01 17:10:39 +0100771
Ian Campbell4b41df72011-02-18 16:43:29 +0000772 irq = xen_allocate_irq_dynamic();
Konrad Rzeszutek Wilke6599222011-09-29 13:26:45 -0400773 if (irq < 0)
Ian Campbellbb5d0792011-02-18 16:43:28 +0000774 goto out;
Stefano Stabellini809f9262010-07-01 17:10:39 +0100775
Stefano Stabellini7e186bd2011-05-06 12:27:50 +0100776 irq_set_chip_and_handler_name(irq, &xen_pirq_chip, handle_edge_irq,
777 name);
Stefano Stabellini809f9262010-07-01 17:10:39 +0100778
Konrad Rzeszutek Wilkbeafbdc2011-04-14 11:17:36 -0400779 xen_irq_info_pirq_init(irq, 0, pirq, 0, vector, domid, 0);
Linus Torvalds5f6fb452011-03-15 19:23:40 -0700780 ret = irq_set_msi_desc(irq, msidesc);
Ian Campbellbf480d92011-02-18 16:43:32 +0000781 if (ret < 0)
782 goto error_irq;
Stefano Stabellini809f9262010-07-01 17:10:39 +0100783out:
Konrad Rzeszutek Wilk77365942011-09-14 05:10:00 -0400784 mutex_unlock(&irq_mapping_update_lock);
Ian Campbell4b41df72011-02-18 16:43:29 +0000785 return irq;
Ian Campbellbf480d92011-02-18 16:43:32 +0000786error_irq:
Konrad Rzeszutek Wilk77365942011-09-14 05:10:00 -0400787 mutex_unlock(&irq_mapping_update_lock);
Ian Campbellbf480d92011-02-18 16:43:32 +0000788 xen_free_irq(irq);
Konrad Rzeszutek Wilke6599222011-09-29 13:26:45 -0400789 return ret;
Stefano Stabellini809f9262010-07-01 17:10:39 +0100790}
Qing Hef731e3ef2010-10-11 15:30:09 +0100791#endif
792
Alex Nixonb5401a92010-03-18 16:31:34 -0400793int xen_destroy_irq(int irq)
794{
795 struct irq_desc *desc;
Jeremy Fitzhardinge38aa66f2010-09-02 14:51:39 +0100796 struct physdev_unmap_pirq unmap_irq;
797 struct irq_info *info = info_for_irq(irq);
Alex Nixonb5401a92010-03-18 16:31:34 -0400798 int rc = -ENOENT;
799
Konrad Rzeszutek Wilk77365942011-09-14 05:10:00 -0400800 mutex_lock(&irq_mapping_update_lock);
Alex Nixonb5401a92010-03-18 16:31:34 -0400801
802 desc = irq_to_desc(irq);
803 if (!desc)
804 goto out;
805
Jeremy Fitzhardinge38aa66f2010-09-02 14:51:39 +0100806 if (xen_initial_domain()) {
Konrad Rzeszutek Wilk12334712010-11-19 11:27:09 -0500807 unmap_irq.pirq = info->u.pirq.pirq;
Konrad Rzeszutek Wilkbeafbdc2011-04-14 11:17:36 -0400808 unmap_irq.domid = info->u.pirq.domid;
Jeremy Fitzhardinge38aa66f2010-09-02 14:51:39 +0100809 rc = HYPERVISOR_physdev_op(PHYSDEVOP_unmap_pirq, &unmap_irq);
Konrad Rzeszutek Wilk1eff1ad2011-02-16 16:26:44 -0500810 /* If another domain quits without making the pci_disable_msix
811 * call, the Xen hypervisor takes care of freeing the PIRQs
812 * (free_domain_pirqs).
813 */
814 if ((rc == -ESRCH && info->u.pirq.domid != DOMID_SELF))
815 printk(KERN_INFO "domain %d does not have %d anymore\n",
816 info->u.pirq.domid, info->u.pirq.pirq);
817 else if (rc) {
Jeremy Fitzhardinge38aa66f2010-09-02 14:51:39 +0100818 printk(KERN_WARNING "unmap irq failed %d\n", rc);
819 goto out;
820 }
821 }
Alex Nixonb5401a92010-03-18 16:31:34 -0400822
Ian Campbellc9df1ce2011-01-11 17:20:15 +0000823 xen_free_irq(irq);
Alex Nixonb5401a92010-03-18 16:31:34 -0400824
825out:
Konrad Rzeszutek Wilk77365942011-09-14 05:10:00 -0400826 mutex_unlock(&irq_mapping_update_lock);
Alex Nixonb5401a92010-03-18 16:31:34 -0400827 return rc;
828}
829
Stefano Stabelliniaf42b8d2010-12-01 14:51:44 +0000830int xen_irq_from_pirq(unsigned pirq)
831{
Ian Campbell69c358c2011-03-10 16:08:13 +0000832 int irq;
833
834 struct irq_info *info;
835
Konrad Rzeszutek Wilk77365942011-09-14 05:10:00 -0400836 mutex_lock(&irq_mapping_update_lock);
Ian Campbell69c358c2011-03-10 16:08:13 +0000837
838 list_for_each_entry(info, &xen_irq_list_head, list) {
Konrad Rzeszutek Wilk9bb9efe2011-09-29 13:13:30 -0400839 if (info->type != IRQT_PIRQ)
Ian Campbell69c358c2011-03-10 16:08:13 +0000840 continue;
841 irq = info->irq;
842 if (info->u.pirq.pirq == pirq)
843 goto out;
844 }
845 irq = -1;
846out:
Konrad Rzeszutek Wilk77365942011-09-14 05:10:00 -0400847 mutex_unlock(&irq_mapping_update_lock);
Ian Campbell69c358c2011-03-10 16:08:13 +0000848
849 return irq;
Stefano Stabelliniaf42b8d2010-12-01 14:51:44 +0000850}
851
Konrad Rzeszutek Wilke6197ac2011-02-24 14:20:12 -0500852
853int xen_pirq_from_irq(unsigned irq)
854{
855 return pirq_from_irq(irq);
856}
857EXPORT_SYMBOL_GPL(xen_pirq_from_irq);
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -0700858int bind_evtchn_to_irq(unsigned int evtchn)
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700859{
860 int irq;
861
Konrad Rzeszutek Wilk77365942011-09-14 05:10:00 -0400862 mutex_lock(&irq_mapping_update_lock);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700863
864 irq = evtchn_to_irq[evtchn];
865
866 if (irq == -1) {
Ian Campbellc9df1ce2011-01-11 17:20:15 +0000867 irq = xen_allocate_irq_dynamic();
Wei Liu68ba45f2013-01-31 14:46:56 +0000868 if (irq < 0)
Ian Campbell7bee9762011-03-10 16:08:15 +0000869 goto out;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700870
Thomas Gleixnerc442b802011-03-25 10:58:06 +0100871 irq_set_chip_and_handler_name(irq, &xen_dynamic_chip,
Stefano Stabellini7e186bd2011-05-06 12:27:50 +0100872 handle_edge_irq, "event");
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700873
Ian Campbell9158c352011-03-10 16:08:09 +0000874 xen_irq_info_evtchn_init(irq, evtchn);
Konrad Rzeszutek Wilk5e152e62012-05-23 13:28:44 -0400875 } else {
876 struct irq_info *info = info_for_irq(irq);
877 WARN_ON(info == NULL || info->type != IRQT_EVTCHN);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700878 }
Stefano Stabellinia8636c02012-08-22 17:20:15 +0100879 irq_clear_status_flags(irq, IRQ_NOREQUEST|IRQ_NOAUTOEN);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700880
Ian Campbell7bee9762011-03-10 16:08:15 +0000881out:
Konrad Rzeszutek Wilk77365942011-09-14 05:10:00 -0400882 mutex_unlock(&irq_mapping_update_lock);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700883
884 return irq;
885}
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -0700886EXPORT_SYMBOL_GPL(bind_evtchn_to_irq);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700887
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700888static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu)
889{
890 struct evtchn_bind_ipi bind_ipi;
891 int evtchn, irq;
892
Konrad Rzeszutek Wilk77365942011-09-14 05:10:00 -0400893 mutex_lock(&irq_mapping_update_lock);
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700894
895 irq = per_cpu(ipi_to_irq, cpu)[ipi];
Ian Campbell90af9512009-02-06 16:55:58 -0800896
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700897 if (irq == -1) {
Ian Campbellc9df1ce2011-01-11 17:20:15 +0000898 irq = xen_allocate_irq_dynamic();
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700899 if (irq < 0)
900 goto out;
901
Thomas Gleixnerc442b802011-03-25 10:58:06 +0100902 irq_set_chip_and_handler_name(irq, &xen_percpu_chip,
Jeremy Fitzhardingeaaca4962010-08-20 18:57:53 -0700903 handle_percpu_irq, "ipi");
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700904
905 bind_ipi.vcpu = cpu;
906 if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi,
907 &bind_ipi) != 0)
908 BUG();
909 evtchn = bind_ipi.port;
910
Ian Campbell3d4cfa32011-03-10 16:08:10 +0000911 xen_irq_info_ipi_init(cpu, irq, evtchn, ipi);
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700912
913 bind_evtchn_to_cpu(evtchn, cpu);
Konrad Rzeszutek Wilk5e152e62012-05-23 13:28:44 -0400914 } else {
915 struct irq_info *info = info_for_irq(irq);
916 WARN_ON(info == NULL || info->type != IRQT_IPI);
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700917 }
918
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700919 out:
Konrad Rzeszutek Wilk77365942011-09-14 05:10:00 -0400920 mutex_unlock(&irq_mapping_update_lock);
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700921 return irq;
922}
923
Ian Campbell2e820f52009-02-09 12:05:50 -0800924static int bind_interdomain_evtchn_to_irq(unsigned int remote_domain,
925 unsigned int remote_port)
926{
927 struct evtchn_bind_interdomain bind_interdomain;
928 int err;
929
930 bind_interdomain.remote_dom = remote_domain;
931 bind_interdomain.remote_port = remote_port;
932
933 err = HYPERVISOR_event_channel_op(EVTCHNOP_bind_interdomain,
934 &bind_interdomain);
935
936 return err ? : bind_evtchn_to_irq(bind_interdomain.local_port);
937}
938
Olaf Hering62cc5fc2011-08-25 18:30:48 +0200939static int find_virq(unsigned int virq, unsigned int cpu)
940{
941 struct evtchn_status status;
942 int port, rc = -ENOENT;
943
944 memset(&status, 0, sizeof(status));
945 for (port = 0; port <= NR_EVENT_CHANNELS; port++) {
946 status.dom = DOMID_SELF;
947 status.port = port;
948 rc = HYPERVISOR_event_channel_op(EVTCHNOP_status, &status);
949 if (rc < 0)
950 continue;
951 if (status.status != EVTCHNSTAT_virq)
952 continue;
953 if (status.u.virq == virq && status.vcpu == cpu) {
954 rc = port;
955 break;
956 }
957 }
958 return rc;
959}
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700960
Jeremy Fitzhardinge4fe7d5a2010-09-02 16:17:06 +0100961int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700962{
963 struct evtchn_bind_virq bind_virq;
Olaf Hering62cc5fc2011-08-25 18:30:48 +0200964 int evtchn, irq, ret;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700965
Konrad Rzeszutek Wilk77365942011-09-14 05:10:00 -0400966 mutex_lock(&irq_mapping_update_lock);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700967
968 irq = per_cpu(virq_to_irq, cpu)[virq];
969
970 if (irq == -1) {
Ian Campbellc9df1ce2011-01-11 17:20:15 +0000971 irq = xen_allocate_irq_dynamic();
Wei Liu68ba45f2013-01-31 14:46:56 +0000972 if (irq < 0)
Ian Campbell7bee9762011-03-10 16:08:15 +0000973 goto out;
Jeremy Fitzhardingea52521f2010-09-22 15:28:52 -0700974
Thomas Gleixnerc442b802011-03-25 10:58:06 +0100975 irq_set_chip_and_handler_name(irq, &xen_percpu_chip,
Jeremy Fitzhardingea52521f2010-09-22 15:28:52 -0700976 handle_percpu_irq, "virq");
977
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700978 bind_virq.virq = virq;
979 bind_virq.vcpu = cpu;
Olaf Hering62cc5fc2011-08-25 18:30:48 +0200980 ret = HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq,
981 &bind_virq);
982 if (ret == 0)
983 evtchn = bind_virq.port;
984 else {
985 if (ret == -EEXIST)
986 ret = find_virq(virq, cpu);
987 BUG_ON(ret < 0);
988 evtchn = ret;
989 }
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700990
Ian Campbell3d4cfa32011-03-10 16:08:10 +0000991 xen_irq_info_virq_init(cpu, irq, evtchn, virq);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700992
993 bind_evtchn_to_cpu(evtchn, cpu);
Konrad Rzeszutek Wilk5e152e62012-05-23 13:28:44 -0400994 } else {
995 struct irq_info *info = info_for_irq(irq);
996 WARN_ON(info == NULL || info->type != IRQT_VIRQ);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -0700997 }
998
Ian Campbell7bee9762011-03-10 16:08:15 +0000999out:
Konrad Rzeszutek Wilk77365942011-09-14 05:10:00 -04001000 mutex_unlock(&irq_mapping_update_lock);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001001
1002 return irq;
1003}
1004
1005static void unbind_from_irq(unsigned int irq)
1006{
1007 struct evtchn_close close;
1008 int evtchn = evtchn_from_irq(irq);
Daniel De Graaf420eb552011-10-27 17:58:47 -04001009 struct irq_info *info = irq_get_handler_data(irq);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001010
Konrad Rzeszutek Wilk77365942011-09-14 05:10:00 -04001011 mutex_lock(&irq_mapping_update_lock);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001012
Daniel De Graaf420eb552011-10-27 17:58:47 -04001013 if (info->refcnt > 0) {
1014 info->refcnt--;
1015 if (info->refcnt != 0)
1016 goto done;
1017 }
1018
Jeremy Fitzhardinged77bbd42009-02-06 14:09:45 -08001019 if (VALID_EVTCHN(evtchn)) {
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001020 close.port = evtchn;
1021 if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
1022 BUG();
1023
1024 switch (type_from_irq(irq)) {
1025 case IRQT_VIRQ:
1026 per_cpu(virq_to_irq, cpu_from_evtchn(evtchn))
Jeremy Fitzhardingeced40d02009-02-06 14:09:44 -08001027 [virq_from_irq(irq)] = -1;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001028 break;
Alex Nixond68d82a2008-08-22 11:52:15 +01001029 case IRQT_IPI:
1030 per_cpu(ipi_to_irq, cpu_from_evtchn(evtchn))
Jeremy Fitzhardingeced40d02009-02-06 14:09:44 -08001031 [ipi_from_irq(irq)] = -1;
Alex Nixond68d82a2008-08-22 11:52:15 +01001032 break;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001033 default:
1034 break;
1035 }
1036
1037 /* Closed ports are implicitly re-bound to VCPU0. */
1038 bind_evtchn_to_cpu(evtchn, 0);
1039
1040 evtchn_to_irq[evtchn] = -1;
Ian Campbellfed5ea82009-12-01 16:15:30 +00001041 }
1042
Ian Campbellca62ce82011-03-10 16:08:12 +00001043 BUG_ON(info_for_irq(irq)->type == IRQT_UNBOUND);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001044
Ian Campbell9158c352011-03-10 16:08:09 +00001045 xen_free_irq(irq);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001046
Daniel De Graaf420eb552011-10-27 17:58:47 -04001047 done:
Konrad Rzeszutek Wilk77365942011-09-14 05:10:00 -04001048 mutex_unlock(&irq_mapping_update_lock);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001049}
1050
1051int bind_evtchn_to_irqhandler(unsigned int evtchn,
Jeff Garzik7c239972007-10-19 03:12:20 -04001052 irq_handler_t handler,
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001053 unsigned long irqflags,
1054 const char *devname, void *dev_id)
1055{
Nicolas Kaiser361ae8c2011-03-30 21:14:26 +02001056 int irq, retval;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001057
1058 irq = bind_evtchn_to_irq(evtchn);
Ian Campbell7bee9762011-03-10 16:08:15 +00001059 if (irq < 0)
1060 return irq;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001061 retval = request_irq(irq, handler, irqflags, devname, dev_id);
1062 if (retval != 0) {
1063 unbind_from_irq(irq);
1064 return retval;
1065 }
1066
1067 return irq;
1068}
1069EXPORT_SYMBOL_GPL(bind_evtchn_to_irqhandler);
1070
Ian Campbell2e820f52009-02-09 12:05:50 -08001071int bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain,
1072 unsigned int remote_port,
1073 irq_handler_t handler,
1074 unsigned long irqflags,
1075 const char *devname,
1076 void *dev_id)
1077{
1078 int irq, retval;
1079
1080 irq = bind_interdomain_evtchn_to_irq(remote_domain, remote_port);
1081 if (irq < 0)
1082 return irq;
1083
1084 retval = request_irq(irq, handler, irqflags, devname, dev_id);
1085 if (retval != 0) {
1086 unbind_from_irq(irq);
1087 return retval;
1088 }
1089
1090 return irq;
1091}
1092EXPORT_SYMBOL_GPL(bind_interdomain_evtchn_to_irqhandler);
1093
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001094int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
Jeff Garzik7c239972007-10-19 03:12:20 -04001095 irq_handler_t handler,
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001096 unsigned long irqflags, const char *devname, void *dev_id)
1097{
Nicolas Kaiser361ae8c2011-03-30 21:14:26 +02001098 int irq, retval;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001099
1100 irq = bind_virq_to_irq(virq, cpu);
Ian Campbell7bee9762011-03-10 16:08:15 +00001101 if (irq < 0)
1102 return irq;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001103 retval = request_irq(irq, handler, irqflags, devname, dev_id);
1104 if (retval != 0) {
1105 unbind_from_irq(irq);
1106 return retval;
1107 }
1108
1109 return irq;
1110}
1111EXPORT_SYMBOL_GPL(bind_virq_to_irqhandler);
1112
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -07001113int bind_ipi_to_irqhandler(enum ipi_vector ipi,
1114 unsigned int cpu,
1115 irq_handler_t handler,
1116 unsigned long irqflags,
1117 const char *devname,
1118 void *dev_id)
1119{
1120 int irq, retval;
1121
1122 irq = bind_ipi_to_irq(ipi, cpu);
1123 if (irq < 0)
1124 return irq;
1125
Ian Campbell9bab0b72011-10-03 15:37:00 +01001126 irqflags |= IRQF_NO_SUSPEND | IRQF_FORCE_RESUME | IRQF_EARLY_RESUME;
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -07001127 retval = request_irq(irq, handler, irqflags, devname, dev_id);
1128 if (retval != 0) {
1129 unbind_from_irq(irq);
1130 return retval;
1131 }
1132
1133 return irq;
1134}
1135
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001136void unbind_from_irqhandler(unsigned int irq, void *dev_id)
1137{
1138 free_irq(irq, dev_id);
1139 unbind_from_irq(irq);
1140}
1141EXPORT_SYMBOL_GPL(unbind_from_irqhandler);
1142
Daniel De Graaf420eb552011-10-27 17:58:47 -04001143int evtchn_make_refcounted(unsigned int evtchn)
1144{
1145 int irq = evtchn_to_irq[evtchn];
1146 struct irq_info *info;
1147
1148 if (irq == -1)
1149 return -ENOENT;
1150
1151 info = irq_get_handler_data(irq);
1152
1153 if (!info)
1154 return -ENOENT;
1155
1156 WARN_ON(info->refcnt != -1);
1157
1158 info->refcnt = 1;
1159
1160 return 0;
1161}
1162EXPORT_SYMBOL_GPL(evtchn_make_refcounted);
1163
1164int evtchn_get(unsigned int evtchn)
1165{
1166 int irq;
1167 struct irq_info *info;
1168 int err = -ENOENT;
1169
Daniel De Graafc3b3f162011-11-28 11:49:09 -05001170 if (evtchn >= NR_EVENT_CHANNELS)
1171 return -EINVAL;
1172
Daniel De Graaf420eb552011-10-27 17:58:47 -04001173 mutex_lock(&irq_mapping_update_lock);
1174
1175 irq = evtchn_to_irq[evtchn];
1176 if (irq == -1)
1177 goto done;
1178
1179 info = irq_get_handler_data(irq);
1180
1181 if (!info)
1182 goto done;
1183
1184 err = -EINVAL;
1185 if (info->refcnt <= 0)
1186 goto done;
1187
1188 info->refcnt++;
1189 err = 0;
1190 done:
1191 mutex_unlock(&irq_mapping_update_lock);
1192
1193 return err;
1194}
1195EXPORT_SYMBOL_GPL(evtchn_get);
1196
1197void evtchn_put(unsigned int evtchn)
1198{
1199 int irq = evtchn_to_irq[evtchn];
1200 if (WARN_ON(irq == -1))
1201 return;
1202 unbind_from_irq(irq);
1203}
1204EXPORT_SYMBOL_GPL(evtchn_put);
1205
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -07001206void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector)
1207{
1208 int irq = per_cpu(ipi_to_irq, cpu)[vector];
1209 BUG_ON(irq < 0);
1210 notify_remote_via_irq(irq);
1211}
1212
Jeremy Fitzhardingeee523ca2008-03-17 16:37:18 -07001213irqreturn_t xen_debug_interrupt(int irq, void *dev_id)
1214{
1215 struct shared_info *sh = HYPERVISOR_shared_info;
1216 int cpu = smp_processor_id();
Ian Campbellc81611c2013-02-20 11:48:06 +00001217 xen_ulong_t *cpu_evtchn = per_cpu(cpu_evtchn_mask, cpu);
Jeremy Fitzhardingeee523ca2008-03-17 16:37:18 -07001218 int i;
1219 unsigned long flags;
1220 static DEFINE_SPINLOCK(debug_lock);
Ian Campbellcb52e6d2010-10-15 11:52:46 +01001221 struct vcpu_info *v;
Jeremy Fitzhardingeee523ca2008-03-17 16:37:18 -07001222
1223 spin_lock_irqsave(&debug_lock, flags);
1224
Ian Campbellcb52e6d2010-10-15 11:52:46 +01001225 printk("\nvcpu %d\n ", cpu);
Jeremy Fitzhardingeee523ca2008-03-17 16:37:18 -07001226
1227 for_each_online_cpu(i) {
Ian Campbellcb52e6d2010-10-15 11:52:46 +01001228 int pending;
1229 v = per_cpu(xen_vcpu, i);
1230 pending = (get_irq_regs() && i == cpu)
1231 ? xen_irqs_disabled(get_irq_regs())
1232 : v->evtchn_upcall_mask;
Ian Campbellc81611c2013-02-20 11:48:06 +00001233 printk("%d: masked=%d pending=%d event_sel %0*"PRI_xen_ulong"\n ", i,
Ian Campbellcb52e6d2010-10-15 11:52:46 +01001234 pending, v->evtchn_upcall_pending,
1235 (int)(sizeof(v->evtchn_pending_sel)*2),
1236 v->evtchn_pending_sel);
Jeremy Fitzhardingeee523ca2008-03-17 16:37:18 -07001237 }
Ian Campbellcb52e6d2010-10-15 11:52:46 +01001238 v = per_cpu(xen_vcpu, cpu);
Jeremy Fitzhardingeee523ca2008-03-17 16:37:18 -07001239
Ian Campbellcb52e6d2010-10-15 11:52:46 +01001240 printk("\npending:\n ");
1241 for (i = ARRAY_SIZE(sh->evtchn_pending)-1; i >= 0; i--)
Ian Campbellc81611c2013-02-20 11:48:06 +00001242 printk("%0*"PRI_xen_ulong"%s",
1243 (int)sizeof(sh->evtchn_pending[0])*2,
Ian Campbellcb52e6d2010-10-15 11:52:46 +01001244 sh->evtchn_pending[i],
1245 i % 8 == 0 ? "\n " : " ");
1246 printk("\nglobal mask:\n ");
1247 for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--)
Ian Campbellc81611c2013-02-20 11:48:06 +00001248 printk("%0*"PRI_xen_ulong"%s",
Ian Campbellcb52e6d2010-10-15 11:52:46 +01001249 (int)(sizeof(sh->evtchn_mask[0])*2),
1250 sh->evtchn_mask[i],
1251 i % 8 == 0 ? "\n " : " ");
1252
1253 printk("\nglobally unmasked:\n ");
1254 for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--)
Ian Campbellc81611c2013-02-20 11:48:06 +00001255 printk("%0*"PRI_xen_ulong"%s",
1256 (int)(sizeof(sh->evtchn_mask[0])*2),
Ian Campbellcb52e6d2010-10-15 11:52:46 +01001257 sh->evtchn_pending[i] & ~sh->evtchn_mask[i],
1258 i % 8 == 0 ? "\n " : " ");
1259
1260 printk("\nlocal cpu%d mask:\n ", cpu);
Ian Campbellc81611c2013-02-20 11:48:06 +00001261 for (i = (NR_EVENT_CHANNELS/BITS_PER_EVTCHN_WORD)-1; i >= 0; i--)
1262 printk("%0*"PRI_xen_ulong"%s", (int)(sizeof(cpu_evtchn[0])*2),
Ian Campbellcb52e6d2010-10-15 11:52:46 +01001263 cpu_evtchn[i],
1264 i % 8 == 0 ? "\n " : " ");
1265
1266 printk("\nlocally unmasked:\n ");
1267 for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--) {
Ian Campbellc81611c2013-02-20 11:48:06 +00001268 xen_ulong_t pending = sh->evtchn_pending[i]
Ian Campbellcb52e6d2010-10-15 11:52:46 +01001269 & ~sh->evtchn_mask[i]
1270 & cpu_evtchn[i];
Ian Campbellc81611c2013-02-20 11:48:06 +00001271 printk("%0*"PRI_xen_ulong"%s",
1272 (int)(sizeof(sh->evtchn_mask[0])*2),
Ian Campbellcb52e6d2010-10-15 11:52:46 +01001273 pending, i % 8 == 0 ? "\n " : " ");
1274 }
Jeremy Fitzhardingeee523ca2008-03-17 16:37:18 -07001275
1276 printk("\npending list:\n");
Ian Campbellcb52e6d2010-10-15 11:52:46 +01001277 for (i = 0; i < NR_EVENT_CHANNELS; i++) {
Ian Campbellc81611c2013-02-20 11:48:06 +00001278 if (sync_test_bit(i, BM(sh->evtchn_pending))) {
1279 int word_idx = i / BITS_PER_EVTCHN_WORD;
Ian Campbellcb52e6d2010-10-15 11:52:46 +01001280 printk(" %d: event %d -> irq %d%s%s%s\n",
Jeremy Fitzhardingeced40d02009-02-06 14:09:44 -08001281 cpu_from_evtchn(i), i,
Ian Campbellcb52e6d2010-10-15 11:52:46 +01001282 evtchn_to_irq[i],
Ian Campbellc81611c2013-02-20 11:48:06 +00001283 sync_test_bit(word_idx, BM(&v->evtchn_pending_sel))
Ian Campbellcb52e6d2010-10-15 11:52:46 +01001284 ? "" : " l2-clear",
Ian Campbellc81611c2013-02-20 11:48:06 +00001285 !sync_test_bit(i, BM(sh->evtchn_mask))
Ian Campbellcb52e6d2010-10-15 11:52:46 +01001286 ? "" : " globally-masked",
Ian Campbellc81611c2013-02-20 11:48:06 +00001287 sync_test_bit(i, BM(cpu_evtchn))
Ian Campbellcb52e6d2010-10-15 11:52:46 +01001288 ? "" : " locally-masked");
Jeremy Fitzhardingeee523ca2008-03-17 16:37:18 -07001289 }
1290 }
1291
1292 spin_unlock_irqrestore(&debug_lock, flags);
1293
1294 return IRQ_HANDLED;
1295}
1296
Tejun Heo245b2e72009-06-24 15:13:48 +09001297static DEFINE_PER_CPU(unsigned, xed_nesting_count);
Keir Fraserada68142011-03-03 10:01:11 +00001298static DEFINE_PER_CPU(unsigned int, current_word_idx);
1299static DEFINE_PER_CPU(unsigned int, current_bit_idx);
Tejun Heo245b2e72009-06-24 15:13:48 +09001300
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001301/*
Scott Rixnerab7f8632011-03-03 09:30:08 +00001302 * Mask out the i least significant bits of w
1303 */
Ian Campbellc81611c2013-02-20 11:48:06 +00001304#define MASK_LSBS(w, i) (w & ((~((xen_ulong_t)0UL)) << i))
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001305
1306/*
1307 * Search the CPUs pending events bitmasks. For each one found, map
1308 * the event number to an irq, and feed it into do_IRQ() for
1309 * handling.
1310 *
1311 * Xen uses a two-level bitmap to speed searching. The first level is
1312 * a bitset of words which contain pending event bits. The second
1313 * level is a bitset of pending events themselves.
1314 */
Sheng Yang38e20b02010-05-14 12:40:51 +01001315static void __xen_evtchn_do_upcall(void)
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001316{
Keir Fraser24b51c22011-03-03 11:06:28 +00001317 int start_word_idx, start_bit_idx;
Scott Rixnerab7f8632011-03-03 09:30:08 +00001318 int word_idx, bit_idx;
Keir Fraser24b51c22011-03-03 11:06:28 +00001319 int i;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001320 int cpu = get_cpu();
1321 struct shared_info *s = HYPERVISOR_shared_info;
Christoph Lameter780f36d2010-12-06 11:16:29 -06001322 struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu);
Ruslan Pisarev088c05a2011-07-26 14:16:13 +03001323 unsigned count;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001324
Jeremy Fitzhardinge229664b2008-03-17 16:37:20 -07001325 do {
Ian Campbellc81611c2013-02-20 11:48:06 +00001326 xen_ulong_t pending_words;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001327
Jeremy Fitzhardinge229664b2008-03-17 16:37:20 -07001328 vcpu_info->evtchn_upcall_pending = 0;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001329
Christoph Lameterb2e4ae62010-12-06 11:40:07 -06001330 if (__this_cpu_inc_return(xed_nesting_count) - 1)
Jeremy Fitzhardinge229664b2008-03-17 16:37:20 -07001331 goto out;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001332
Ian Campbellc81611c2013-02-20 11:48:06 +00001333 /*
1334 * Master flag must be cleared /before/ clearing
1335 * selector flag. xchg_xen_ulong must contain an
1336 * appropriate barrier.
1337 */
1338 pending_words = xchg_xen_ulong(&vcpu_info->evtchn_pending_sel, 0);
Jeremy Fitzhardinge229664b2008-03-17 16:37:20 -07001339
Keir Fraser24b51c22011-03-03 11:06:28 +00001340 start_word_idx = __this_cpu_read(current_word_idx);
1341 start_bit_idx = __this_cpu_read(current_bit_idx);
Scott Rixnerab7f8632011-03-03 09:30:08 +00001342
Keir Fraser24b51c22011-03-03 11:06:28 +00001343 word_idx = start_word_idx;
1344
1345 for (i = 0; pending_words != 0; i++) {
Ian Campbellc81611c2013-02-20 11:48:06 +00001346 xen_ulong_t pending_bits;
1347 xen_ulong_t words;
Jeremy Fitzhardinge229664b2008-03-17 16:37:20 -07001348
Scott Rixnerab7f8632011-03-03 09:30:08 +00001349 words = MASK_LSBS(pending_words, word_idx);
1350
1351 /*
Keir Fraserada68142011-03-03 10:01:11 +00001352 * If we masked out all events, wrap to beginning.
Scott Rixnerab7f8632011-03-03 09:30:08 +00001353 */
1354 if (words == 0) {
Keir Fraserada68142011-03-03 10:01:11 +00001355 word_idx = 0;
1356 bit_idx = 0;
Scott Rixnerab7f8632011-03-03 09:30:08 +00001357 continue;
1358 }
Ian Campbellc81611c2013-02-20 11:48:06 +00001359 word_idx = EVTCHN_FIRST_BIT(words);
Scott Rixnerab7f8632011-03-03 09:30:08 +00001360
Keir Fraser24b51c22011-03-03 11:06:28 +00001361 pending_bits = active_evtchns(cpu, s, word_idx);
1362 bit_idx = 0; /* usually scan entire word from start */
1363 if (word_idx == start_word_idx) {
1364 /* We scan the starting word in two parts */
1365 if (i == 0)
1366 /* 1st time: start in the middle */
1367 bit_idx = start_bit_idx;
1368 else
1369 /* 2nd time: mask bits done already */
1370 bit_idx &= (1UL << start_bit_idx) - 1;
1371 }
1372
Scott Rixnerab7f8632011-03-03 09:30:08 +00001373 do {
Ian Campbellc81611c2013-02-20 11:48:06 +00001374 xen_ulong_t bits;
Scott Rixnerab7f8632011-03-03 09:30:08 +00001375 int port, irq;
Eric W. Biedermanca4dbc62010-02-17 18:49:54 -08001376 struct irq_desc *desc;
Jeremy Fitzhardinge229664b2008-03-17 16:37:20 -07001377
Scott Rixnerab7f8632011-03-03 09:30:08 +00001378 bits = MASK_LSBS(pending_bits, bit_idx);
1379
1380 /* If we masked out all events, move on. */
Keir Fraserada68142011-03-03 10:01:11 +00001381 if (bits == 0)
Scott Rixnerab7f8632011-03-03 09:30:08 +00001382 break;
Scott Rixnerab7f8632011-03-03 09:30:08 +00001383
Ian Campbellc81611c2013-02-20 11:48:06 +00001384 bit_idx = EVTCHN_FIRST_BIT(bits);
Scott Rixnerab7f8632011-03-03 09:30:08 +00001385
1386 /* Process port. */
Ian Campbellc81611c2013-02-20 11:48:06 +00001387 port = (word_idx * BITS_PER_EVTCHN_WORD) + bit_idx;
Scott Rixnerab7f8632011-03-03 09:30:08 +00001388 irq = evtchn_to_irq[port];
1389
Eric W. Biedermanca4dbc62010-02-17 18:49:54 -08001390 if (irq != -1) {
1391 desc = irq_to_desc(irq);
1392 if (desc)
1393 generic_handle_irq_desc(irq, desc);
1394 }
Scott Rixnerab7f8632011-03-03 09:30:08 +00001395
Ian Campbellc81611c2013-02-20 11:48:06 +00001396 bit_idx = (bit_idx + 1) % BITS_PER_EVTCHN_WORD;
Keir Fraserada68142011-03-03 10:01:11 +00001397
1398 /* Next caller starts at last processed + 1 */
1399 __this_cpu_write(current_word_idx,
1400 bit_idx ? word_idx :
Ian Campbellc81611c2013-02-20 11:48:06 +00001401 (word_idx+1) % BITS_PER_EVTCHN_WORD);
Keir Fraserada68142011-03-03 10:01:11 +00001402 __this_cpu_write(current_bit_idx, bit_idx);
1403 } while (bit_idx != 0);
Scott Rixnerab7f8632011-03-03 09:30:08 +00001404
Keir Fraser24b51c22011-03-03 11:06:28 +00001405 /* Scan start_l1i twice; all others once. */
1406 if ((word_idx != start_word_idx) || (i != 0))
Scott Rixnerab7f8632011-03-03 09:30:08 +00001407 pending_words &= ~(1UL << word_idx);
Keir Fraserada68142011-03-03 10:01:11 +00001408
Ian Campbellc81611c2013-02-20 11:48:06 +00001409 word_idx = (word_idx + 1) % BITS_PER_EVTCHN_WORD;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001410 }
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001411
Jeremy Fitzhardinge229664b2008-03-17 16:37:20 -07001412 BUG_ON(!irqs_disabled());
1413
Christoph Lameter780f36d2010-12-06 11:16:29 -06001414 count = __this_cpu_read(xed_nesting_count);
1415 __this_cpu_write(xed_nesting_count, 0);
Stefano Stabellini183d03c2010-05-17 17:08:21 +01001416 } while (count != 1 || vcpu_info->evtchn_upcall_pending);
Jeremy Fitzhardinge229664b2008-03-17 16:37:20 -07001417
1418out:
Jeremy Fitzhardinge3445a8f2009-02-06 14:09:46 -08001419
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001420 put_cpu();
1421}
1422
Sheng Yang38e20b02010-05-14 12:40:51 +01001423void xen_evtchn_do_upcall(struct pt_regs *regs)
1424{
1425 struct pt_regs *old_regs = set_irq_regs(regs);
1426
Mojiong Qiu772aebc2012-11-06 16:08:15 +08001427 irq_enter();
Stefano Stabellini0ec53ec2012-09-14 13:37:32 +00001428#ifdef CONFIG_X86
Sheng Yang38e20b02010-05-14 12:40:51 +01001429 exit_idle();
Stefano Stabellini0ec53ec2012-09-14 13:37:32 +00001430#endif
Sheng Yang38e20b02010-05-14 12:40:51 +01001431
1432 __xen_evtchn_do_upcall();
1433
1434 irq_exit();
1435 set_irq_regs(old_regs);
1436}
1437
1438void xen_hvm_evtchn_do_upcall(void)
1439{
1440 __xen_evtchn_do_upcall();
1441}
Stefano Stabellini183d03c2010-05-17 17:08:21 +01001442EXPORT_SYMBOL_GPL(xen_hvm_evtchn_do_upcall);
Sheng Yang38e20b02010-05-14 12:40:51 +01001443
Jeremy Fitzhardingeeb1e3052008-05-26 23:31:23 +01001444/* Rebind a new event channel to an existing irq. */
1445void rebind_evtchn_irq(int evtchn, int irq)
1446{
Jeremy Fitzhardinged77bbd42009-02-06 14:09:45 -08001447 struct irq_info *info = info_for_irq(irq);
1448
Jeremy Fitzhardingeeb1e3052008-05-26 23:31:23 +01001449 /* Make sure the irq is masked, since the new event channel
1450 will also be masked. */
1451 disable_irq(irq);
1452
Konrad Rzeszutek Wilk77365942011-09-14 05:10:00 -04001453 mutex_lock(&irq_mapping_update_lock);
Jeremy Fitzhardingeeb1e3052008-05-26 23:31:23 +01001454
1455 /* After resume the irq<->evtchn mappings are all cleared out */
1456 BUG_ON(evtchn_to_irq[evtchn] != -1);
1457 /* Expect irq to have been bound before,
Jeremy Fitzhardinged77bbd42009-02-06 14:09:45 -08001458 so there should be a proper type */
1459 BUG_ON(info->type == IRQT_UNBOUND);
Jeremy Fitzhardingeeb1e3052008-05-26 23:31:23 +01001460
Ian Campbell9158c352011-03-10 16:08:09 +00001461 xen_irq_info_evtchn_init(irq, evtchn);
Jeremy Fitzhardingeeb1e3052008-05-26 23:31:23 +01001462
Konrad Rzeszutek Wilk77365942011-09-14 05:10:00 -04001463 mutex_unlock(&irq_mapping_update_lock);
Jeremy Fitzhardingeeb1e3052008-05-26 23:31:23 +01001464
1465 /* new event channels are always bound to cpu 0 */
Rusty Russell0de26522008-12-13 21:20:26 +10301466 irq_set_affinity(irq, cpumask_of(0));
Jeremy Fitzhardingeeb1e3052008-05-26 23:31:23 +01001467
1468 /* Unmask the event channel. */
1469 enable_irq(irq);
1470}
1471
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001472/* Rebind an evtchn so that it gets delivered to a specific cpu */
Yinghai Lud5dedd42009-04-27 17:59:21 -07001473static int rebind_irq_to_cpu(unsigned irq, unsigned tcpu)
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001474{
1475 struct evtchn_bind_vcpu bind_vcpu;
1476 int evtchn = evtchn_from_irq(irq);
1477
Ian Campbellbe494722011-03-10 16:08:02 +00001478 if (!VALID_EVTCHN(evtchn))
1479 return -1;
1480
1481 /*
1482 * Events delivered via platform PCI interrupts are always
1483 * routed to vcpu 0 and hence cannot be rebound.
1484 */
1485 if (xen_hvm_domain() && !xen_have_vector_callback)
Yinghai Lud5dedd42009-04-27 17:59:21 -07001486 return -1;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001487
1488 /* Send future instances of this interrupt to other vcpu. */
1489 bind_vcpu.port = evtchn;
1490 bind_vcpu.vcpu = tcpu;
1491
1492 /*
1493 * If this fails, it usually just indicates that we're dealing with a
1494 * virq or IPI channel, which don't actually need to be rebound. Ignore
1495 * it, but don't do the xenlinux-level rebind in that case.
1496 */
1497 if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_vcpu, &bind_vcpu) >= 0)
1498 bind_evtchn_to_cpu(evtchn, tcpu);
Yinghai Lud5dedd42009-04-27 17:59:21 -07001499
1500 return 0;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001501}
1502
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +00001503static int set_affinity_irq(struct irq_data *data, const struct cpumask *dest,
1504 bool force)
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001505{
Rusty Russell0de26522008-12-13 21:20:26 +10301506 unsigned tcpu = cpumask_first(dest);
Yinghai Lud5dedd42009-04-27 17:59:21 -07001507
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +00001508 return rebind_irq_to_cpu(data->irq, tcpu);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001509}
1510
Isaku Yamahata642e0c82008-04-02 10:53:57 -07001511int resend_irq_on_evtchn(unsigned int irq)
1512{
1513 int masked, evtchn = evtchn_from_irq(irq);
1514 struct shared_info *s = HYPERVISOR_shared_info;
1515
1516 if (!VALID_EVTCHN(evtchn))
1517 return 1;
1518
Ian Campbellc81611c2013-02-20 11:48:06 +00001519 masked = sync_test_and_set_bit(evtchn, BM(s->evtchn_mask));
1520 sync_set_bit(evtchn, BM(s->evtchn_pending));
Isaku Yamahata642e0c82008-04-02 10:53:57 -07001521 if (!masked)
1522 unmask_evtchn(evtchn);
1523
1524 return 1;
1525}
1526
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +00001527static void enable_dynirq(struct irq_data *data)
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001528{
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +00001529 int evtchn = evtchn_from_irq(data->irq);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001530
1531 if (VALID_EVTCHN(evtchn))
1532 unmask_evtchn(evtchn);
1533}
1534
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +00001535static void disable_dynirq(struct irq_data *data)
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001536{
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +00001537 int evtchn = evtchn_from_irq(data->irq);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001538
1539 if (VALID_EVTCHN(evtchn))
1540 mask_evtchn(evtchn);
1541}
1542
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +00001543static void ack_dynirq(struct irq_data *data)
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001544{
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +00001545 int evtchn = evtchn_from_irq(data->irq);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001546
Stefano Stabellini7e186bd2011-05-06 12:27:50 +01001547 irq_move_irq(data);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001548
1549 if (VALID_EVTCHN(evtchn))
Stefano Stabellini7e186bd2011-05-06 12:27:50 +01001550 clear_evtchn(evtchn);
1551}
1552
1553static void mask_ack_dynirq(struct irq_data *data)
1554{
1555 disable_dynirq(data);
1556 ack_dynirq(data);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001557}
1558
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +00001559static int retrigger_dynirq(struct irq_data *data)
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001560{
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +00001561 int evtchn = evtchn_from_irq(data->irq);
Jeremy Fitzhardingeee8fa1c2008-03-17 16:37:19 -07001562 struct shared_info *sh = HYPERVISOR_shared_info;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001563 int ret = 0;
1564
1565 if (VALID_EVTCHN(evtchn)) {
Jeremy Fitzhardingeee8fa1c2008-03-17 16:37:19 -07001566 int masked;
1567
Ian Campbellc81611c2013-02-20 11:48:06 +00001568 masked = sync_test_and_set_bit(evtchn, BM(sh->evtchn_mask));
1569 sync_set_bit(evtchn, BM(sh->evtchn_pending));
Jeremy Fitzhardingeee8fa1c2008-03-17 16:37:19 -07001570 if (!masked)
1571 unmask_evtchn(evtchn);
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001572 ret = 1;
1573 }
1574
1575 return ret;
1576}
1577
Ian Campbell0a852262011-03-10 16:08:06 +00001578static void restore_pirqs(void)
Stefano Stabellini9a069c32010-12-01 14:51:44 +00001579{
1580 int pirq, rc, irq, gsi;
1581 struct physdev_map_pirq map_irq;
Ian Campbell69c358c2011-03-10 16:08:13 +00001582 struct irq_info *info;
Stefano Stabellini9a069c32010-12-01 14:51:44 +00001583
Ian Campbell69c358c2011-03-10 16:08:13 +00001584 list_for_each_entry(info, &xen_irq_list_head, list) {
1585 if (info->type != IRQT_PIRQ)
Stefano Stabellini9a069c32010-12-01 14:51:44 +00001586 continue;
1587
Ian Campbell69c358c2011-03-10 16:08:13 +00001588 pirq = info->u.pirq.pirq;
1589 gsi = info->u.pirq.gsi;
1590 irq = info->irq;
1591
Stefano Stabellini9a069c32010-12-01 14:51:44 +00001592 /* save/restore of PT devices doesn't work, so at this point the
1593 * only devices present are GSI based emulated devices */
Stefano Stabellini9a069c32010-12-01 14:51:44 +00001594 if (!gsi)
1595 continue;
1596
1597 map_irq.domid = DOMID_SELF;
1598 map_irq.type = MAP_PIRQ_TYPE_GSI;
1599 map_irq.index = gsi;
1600 map_irq.pirq = pirq;
1601
1602 rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
1603 if (rc) {
1604 printk(KERN_WARNING "xen map irq failed gsi=%d irq=%d pirq=%d rc=%d\n",
1605 gsi, irq, pirq, rc);
Ian Campbell9158c352011-03-10 16:08:09 +00001606 xen_free_irq(irq);
Stefano Stabellini9a069c32010-12-01 14:51:44 +00001607 continue;
1608 }
1609
1610 printk(KERN_DEBUG "xen: --> irq=%d, pirq=%d\n", irq, map_irq.pirq);
1611
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +00001612 __startup_pirq(irq);
Stefano Stabellini9a069c32010-12-01 14:51:44 +00001613 }
1614}
1615
Jeremy Fitzhardinge0e913982008-05-26 23:31:27 +01001616static void restore_cpu_virqs(unsigned int cpu)
1617{
1618 struct evtchn_bind_virq bind_virq;
1619 int virq, irq, evtchn;
1620
1621 for (virq = 0; virq < NR_VIRQS; virq++) {
1622 if ((irq = per_cpu(virq_to_irq, cpu)[virq]) == -1)
1623 continue;
1624
Jeremy Fitzhardingeced40d02009-02-06 14:09:44 -08001625 BUG_ON(virq_from_irq(irq) != virq);
Jeremy Fitzhardinge0e913982008-05-26 23:31:27 +01001626
1627 /* Get a new binding from Xen. */
1628 bind_virq.virq = virq;
1629 bind_virq.vcpu = cpu;
1630 if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq,
1631 &bind_virq) != 0)
1632 BUG();
1633 evtchn = bind_virq.port;
1634
1635 /* Record the new mapping. */
Ian Campbell3d4cfa32011-03-10 16:08:10 +00001636 xen_irq_info_virq_init(cpu, irq, evtchn, virq);
Jeremy Fitzhardinge0e913982008-05-26 23:31:27 +01001637 bind_evtchn_to_cpu(evtchn, cpu);
Jeremy Fitzhardinge0e913982008-05-26 23:31:27 +01001638 }
1639}
1640
1641static void restore_cpu_ipis(unsigned int cpu)
1642{
1643 struct evtchn_bind_ipi bind_ipi;
1644 int ipi, irq, evtchn;
1645
1646 for (ipi = 0; ipi < XEN_NR_IPIS; ipi++) {
1647 if ((irq = per_cpu(ipi_to_irq, cpu)[ipi]) == -1)
1648 continue;
1649
Jeremy Fitzhardingeced40d02009-02-06 14:09:44 -08001650 BUG_ON(ipi_from_irq(irq) != ipi);
Jeremy Fitzhardinge0e913982008-05-26 23:31:27 +01001651
1652 /* Get a new binding from Xen. */
1653 bind_ipi.vcpu = cpu;
1654 if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi,
1655 &bind_ipi) != 0)
1656 BUG();
1657 evtchn = bind_ipi.port;
1658
1659 /* Record the new mapping. */
Ian Campbell3d4cfa32011-03-10 16:08:10 +00001660 xen_irq_info_ipi_init(cpu, irq, evtchn, ipi);
Jeremy Fitzhardinge0e913982008-05-26 23:31:27 +01001661 bind_evtchn_to_cpu(evtchn, cpu);
Jeremy Fitzhardinge0e913982008-05-26 23:31:27 +01001662 }
1663}
1664
Jeremy Fitzhardinge2d9e1e22008-07-07 12:07:53 -07001665/* Clear an irq's pending state, in preparation for polling on it */
1666void xen_clear_irq_pending(int irq)
1667{
1668 int evtchn = evtchn_from_irq(irq);
1669
1670 if (VALID_EVTCHN(evtchn))
1671 clear_evtchn(evtchn);
1672}
Konrad Rzeszutek Wilkd9a88142009-11-05 16:33:09 -05001673EXPORT_SYMBOL(xen_clear_irq_pending);
Jeremy Fitzhardinge168d2f42008-08-20 17:02:18 -07001674void xen_set_irq_pending(int irq)
1675{
1676 int evtchn = evtchn_from_irq(irq);
1677
1678 if (VALID_EVTCHN(evtchn))
1679 set_evtchn(evtchn);
1680}
1681
1682bool xen_test_irq_pending(int irq)
1683{
1684 int evtchn = evtchn_from_irq(irq);
1685 bool ret = false;
1686
1687 if (VALID_EVTCHN(evtchn))
1688 ret = test_evtchn(evtchn);
1689
1690 return ret;
1691}
1692
Konrad Rzeszutek Wilkd9a88142009-11-05 16:33:09 -05001693/* Poll waiting for an irq to become pending with timeout. In the usual case,
1694 * the irq will be disabled so it won't deliver an interrupt. */
1695void xen_poll_irq_timeout(int irq, u64 timeout)
Jeremy Fitzhardinge2d9e1e22008-07-07 12:07:53 -07001696{
1697 evtchn_port_t evtchn = evtchn_from_irq(irq);
1698
1699 if (VALID_EVTCHN(evtchn)) {
1700 struct sched_poll poll;
1701
1702 poll.nr_ports = 1;
Konrad Rzeszutek Wilkd9a88142009-11-05 16:33:09 -05001703 poll.timeout = timeout;
Isaku Yamahataff3c5362008-10-14 17:50:44 -07001704 set_xen_guest_handle(poll.ports, &evtchn);
Jeremy Fitzhardinge2d9e1e22008-07-07 12:07:53 -07001705
1706 if (HYPERVISOR_sched_op(SCHEDOP_poll, &poll) != 0)
1707 BUG();
1708 }
1709}
Konrad Rzeszutek Wilkd9a88142009-11-05 16:33:09 -05001710EXPORT_SYMBOL(xen_poll_irq_timeout);
1711/* Poll waiting for an irq to become pending. In the usual case, the
1712 * irq will be disabled so it won't deliver an interrupt. */
1713void xen_poll_irq(int irq)
1714{
1715 xen_poll_irq_timeout(irq, 0 /* no timeout */);
1716}
Jeremy Fitzhardinge2d9e1e22008-07-07 12:07:53 -07001717
Konrad Rzeszutek Wilkc7c2c3a2010-11-08 14:26:36 -05001718/* Check whether the IRQ line is shared with other guests. */
1719int xen_test_irq_shared(int irq)
1720{
1721 struct irq_info *info = info_for_irq(irq);
1722 struct physdev_irq_status_query irq_status = { .irq = info->u.pirq.pirq };
1723
1724 if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status))
1725 return 0;
1726 return !(irq_status.flags & XENIRQSTAT_shared);
1727}
1728EXPORT_SYMBOL_GPL(xen_test_irq_shared);
1729
Jeremy Fitzhardinge0e913982008-05-26 23:31:27 +01001730void xen_irq_resume(void)
1731{
Ian Campbell6cb65372011-03-10 16:08:11 +00001732 unsigned int cpu, evtchn;
1733 struct irq_info *info;
Jeremy Fitzhardinge0e913982008-05-26 23:31:27 +01001734
1735 init_evtchn_cpu_bindings();
1736
1737 /* New event-channel space is not 'live' yet. */
1738 for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++)
1739 mask_evtchn(evtchn);
1740
1741 /* No IRQ <-> event-channel mappings. */
Ian Campbell6cb65372011-03-10 16:08:11 +00001742 list_for_each_entry(info, &xen_irq_list_head, list)
1743 info->evtchn = 0; /* zap event-channel binding */
Jeremy Fitzhardinge0e913982008-05-26 23:31:27 +01001744
1745 for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++)
1746 evtchn_to_irq[evtchn] = -1;
1747
1748 for_each_possible_cpu(cpu) {
1749 restore_cpu_virqs(cpu);
1750 restore_cpu_ipis(cpu);
1751 }
Ian Campbell69035912010-11-01 16:30:09 +00001752
Ian Campbell0a852262011-03-10 16:08:06 +00001753 restore_pirqs();
Jeremy Fitzhardinge0e913982008-05-26 23:31:27 +01001754}
1755
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001756static struct irq_chip xen_dynamic_chip __read_mostly = {
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +00001757 .name = "xen-dyn",
Jeremy Fitzhardinge54a353a2009-02-06 14:09:42 -08001758
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +00001759 .irq_disable = disable_dynirq,
1760 .irq_mask = disable_dynirq,
1761 .irq_unmask = enable_dynirq,
Jeremy Fitzhardinge54a353a2009-02-06 14:09:42 -08001762
Stefano Stabellini7e186bd2011-05-06 12:27:50 +01001763 .irq_ack = ack_dynirq,
1764 .irq_mask_ack = mask_ack_dynirq,
1765
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +00001766 .irq_set_affinity = set_affinity_irq,
1767 .irq_retrigger = retrigger_dynirq,
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001768};
1769
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -04001770static struct irq_chip xen_pirq_chip __read_mostly = {
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +00001771 .name = "xen-pirq",
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -04001772
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +00001773 .irq_startup = startup_pirq,
1774 .irq_shutdown = shutdown_pirq,
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +00001775 .irq_enable = enable_pirq,
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +00001776 .irq_disable = disable_pirq,
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -04001777
Stefano Stabellini7e186bd2011-05-06 12:27:50 +01001778 .irq_mask = disable_dynirq,
1779 .irq_unmask = enable_dynirq,
1780
1781 .irq_ack = eoi_pirq,
1782 .irq_eoi = eoi_pirq,
1783 .irq_mask_ack = mask_ack_pirq,
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -04001784
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +00001785 .irq_set_affinity = set_affinity_irq,
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -04001786
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +00001787 .irq_retrigger = retrigger_dynirq,
Jeremy Fitzhardinged46a78b2010-10-01 12:20:09 -04001788};
1789
Jeremy Fitzhardingeaaca4962010-08-20 18:57:53 -07001790static struct irq_chip xen_percpu_chip __read_mostly = {
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +00001791 .name = "xen-percpu",
Jeremy Fitzhardingeaaca4962010-08-20 18:57:53 -07001792
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +00001793 .irq_disable = disable_dynirq,
1794 .irq_mask = disable_dynirq,
1795 .irq_unmask = enable_dynirq,
Jeremy Fitzhardingeaaca4962010-08-20 18:57:53 -07001796
Thomas Gleixnerc9e265e2011-02-05 20:08:54 +00001797 .irq_ack = ack_dynirq,
Jeremy Fitzhardingeaaca4962010-08-20 18:57:53 -07001798};
1799
Sheng Yang38e20b02010-05-14 12:40:51 +01001800int xen_set_callback_via(uint64_t via)
1801{
1802 struct xen_hvm_param a;
1803 a.domid = DOMID_SELF;
1804 a.index = HVM_PARAM_CALLBACK_IRQ;
1805 a.value = via;
1806 return HYPERVISOR_hvm_op(HVMOP_set_param, &a);
1807}
1808EXPORT_SYMBOL_GPL(xen_set_callback_via);
1809
Stefano Stabellinica65f9f2010-07-29 14:37:48 +01001810#ifdef CONFIG_XEN_PVHVM
Sheng Yang38e20b02010-05-14 12:40:51 +01001811/* Vector callbacks are better than PCI interrupts to receive event
1812 * channel notifications because we can receive vector callbacks on any
1813 * vcpu and we don't need PCI support or APIC interactions. */
1814void xen_callback_vector(void)
1815{
1816 int rc;
1817 uint64_t callback_via;
1818 if (xen_have_vector_callback) {
K. Y. Srinivasanbc2b0332013-02-03 17:22:39 -08001819 callback_via = HVM_CALLBACK_VECTOR(HYPERVISOR_CALLBACK_VECTOR);
Sheng Yang38e20b02010-05-14 12:40:51 +01001820 rc = xen_set_callback_via(callback_via);
1821 if (rc) {
1822 printk(KERN_ERR "Request for Xen HVM callback vector"
1823 " failed.\n");
1824 xen_have_vector_callback = 0;
1825 return;
1826 }
1827 printk(KERN_INFO "Xen HVM callback vector for event delivery is "
1828 "enabled\n");
1829 /* in the restore case the vector has already been allocated */
K. Y. Srinivasanbc2b0332013-02-03 17:22:39 -08001830 if (!test_bit(HYPERVISOR_CALLBACK_VECTOR, used_vectors))
1831 alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR,
1832 xen_hvm_callback_vector);
Sheng Yang38e20b02010-05-14 12:40:51 +01001833 }
1834}
Stefano Stabellinica65f9f2010-07-29 14:37:48 +01001835#else
1836void xen_callback_vector(void) {}
1837#endif
Sheng Yang38e20b02010-05-14 12:40:51 +01001838
Stefano Stabellini2e3d8862012-10-02 15:57:57 +01001839void __init xen_init_IRQ(void)
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001840{
Stefano Stabellini0ec53ec2012-09-14 13:37:32 +00001841 int i;
Mike Travisc7a35892009-01-10 21:58:11 -08001842
Jeremy Fitzhardingeb21ddbf2010-06-07 16:28:49 -04001843 evtchn_to_irq = kcalloc(NR_EVENT_CHANNELS, sizeof(*evtchn_to_irq),
1844 GFP_KERNEL);
Konrad Rzeszutek Wilk9d093e22011-09-29 13:31:21 -04001845 BUG_ON(!evtchn_to_irq);
Jeremy Fitzhardingeb21ddbf2010-06-07 16:28:49 -04001846 for (i = 0; i < NR_EVENT_CHANNELS; i++)
1847 evtchn_to_irq[i] = -1;
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001848
1849 init_evtchn_cpu_bindings();
1850
1851 /* No event channels are 'live' right now. */
1852 for (i = 0; i < NR_EVENT_CHANNELS; i++)
1853 mask_evtchn(i);
1854
Stefano Stabellini9846ff12012-01-30 16:21:48 +00001855 pirq_needs_eoi = pirq_needs_eoi_flag;
1856
Stefano Stabellini0ec53ec2012-09-14 13:37:32 +00001857#ifdef CONFIG_X86
Sheng Yang38e20b02010-05-14 12:40:51 +01001858 if (xen_hvm_domain()) {
1859 xen_callback_vector();
1860 native_init_IRQ();
Stefano Stabellini3942b742010-06-24 17:50:18 +01001861 /* pci_xen_hvm_init must be called after native_init_IRQ so that
1862 * __acpi_register_gsi can point at the right function */
1863 pci_xen_hvm_init();
Sheng Yang38e20b02010-05-14 12:40:51 +01001864 } else {
Stefano Stabellini0ec53ec2012-09-14 13:37:32 +00001865 int rc;
Stefano Stabellini9846ff12012-01-30 16:21:48 +00001866 struct physdev_pirq_eoi_gmfn eoi_gmfn;
1867
Sheng Yang38e20b02010-05-14 12:40:51 +01001868 irq_ctx_init(smp_processor_id());
Jeremy Fitzhardinge38aa66f2010-09-02 14:51:39 +01001869 if (xen_initial_domain())
Konrad Rzeszutek Wilka0ee0562011-06-09 09:49:13 -04001870 pci_xen_initial_domain();
Stefano Stabellini9846ff12012-01-30 16:21:48 +00001871
1872 pirq_eoi_map = (void *)__get_free_page(GFP_KERNEL|__GFP_ZERO);
1873 eoi_gmfn.gmfn = virt_to_mfn(pirq_eoi_map);
1874 rc = HYPERVISOR_physdev_op(PHYSDEVOP_pirq_eoi_gmfn_v2, &eoi_gmfn);
1875 if (rc != 0) {
1876 free_page((unsigned long) pirq_eoi_map);
1877 pirq_eoi_map = NULL;
1878 } else
1879 pirq_needs_eoi = pirq_check_eoi_map;
Sheng Yang38e20b02010-05-14 12:40:51 +01001880 }
Stefano Stabellini0ec53ec2012-09-14 13:37:32 +00001881#endif
Jeremy Fitzhardingee46cdb62007-07-17 18:37:05 -07001882}