Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1 | /* |
| 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 Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 8 | * chip. When an event is received, it is mapped to an irq and sent |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 9 | * 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 Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 19 | * 4. PIRQs - Hardware interrupts. |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 20 | * |
| 21 | * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007 |
| 22 | */ |
| 23 | |
Joe Perches | 283c097 | 2013-06-28 03:21:41 -0700 | [diff] [blame] | 24 | #define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt |
| 25 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 26 | #include <linux/linkage.h> |
| 27 | #include <linux/interrupt.h> |
| 28 | #include <linux/irq.h> |
Paul Gortmaker | 59aa56b | 2016-02-21 19:06:04 -0500 | [diff] [blame] | 29 | #include <linux/moduleparam.h> |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 30 | #include <linux/string.h> |
Christophe Saout | 28e0886 | 2009-01-11 11:46:23 -0800 | [diff] [blame] | 31 | #include <linux/bootmem.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 32 | #include <linux/slab.h> |
Jeremy Fitzhardinge | b21ddbf | 2010-06-07 16:28:49 -0400 | [diff] [blame] | 33 | #include <linux/irqnr.h> |
Qing He | f731e3ef | 2010-10-11 15:30:09 +0100 | [diff] [blame] | 34 | #include <linux/pci.h> |
Juergen Gross | 61d359d | 2020-09-07 15:47:27 +0200 | [diff] [blame^] | 35 | #include <linux/spinlock.h> |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 36 | |
Stefano Stabellini | 0ec53ec | 2012-09-14 13:37:32 +0000 | [diff] [blame] | 37 | #ifdef CONFIG_X86 |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 38 | #include <asm/desc.h> |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 39 | #include <asm/ptrace.h> |
| 40 | #include <asm/irq.h> |
Konrad Rzeszutek Wilk | 0794bfc | 2010-10-18 10:41:08 -0400 | [diff] [blame] | 41 | #include <asm/io_apic.h> |
Boris Ostrovsky | b4ff838 | 2015-11-20 11:25:04 -0500 | [diff] [blame] | 42 | #include <asm/i8259.h> |
Stefano Stabellini | 42a1de5 | 2010-06-24 16:42:04 +0100 | [diff] [blame] | 43 | #include <asm/xen/pci.h> |
Stefano Stabellini | 0ec53ec | 2012-09-14 13:37:32 +0000 | [diff] [blame] | 44 | #endif |
| 45 | #include <asm/sync_bitops.h> |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 46 | #include <asm/xen/hypercall.h> |
Adrian Bunk | 8d1b875 | 2007-07-20 00:31:44 -0700 | [diff] [blame] | 47 | #include <asm/xen/hypervisor.h> |
Julien Grall | a001c9d | 2015-05-05 16:37:30 +0100 | [diff] [blame] | 48 | #include <xen/page.h> |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 49 | |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 50 | #include <xen/xen.h> |
| 51 | #include <xen/hvm.h> |
Isaku Yamahata | e04d0d0 | 2008-04-02 10:53:55 -0700 | [diff] [blame] | 52 | #include <xen/xen-ops.h> |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 53 | #include <xen/events.h> |
| 54 | #include <xen/interface/xen.h> |
| 55 | #include <xen/interface/event_channel.h> |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 56 | #include <xen/interface/hvm/hvm_op.h> |
| 57 | #include <xen/interface/hvm/params.h> |
Stefano Stabellini | 0ec53ec | 2012-09-14 13:37:32 +0000 | [diff] [blame] | 58 | #include <xen/interface/physdev.h> |
| 59 | #include <xen/interface/sched.h> |
Konrad Rzeszutek Wilk | 6efa20e | 2013-07-19 11:51:31 -0400 | [diff] [blame] | 60 | #include <xen/interface/vcpu.h> |
Stefano Stabellini | 0ec53ec | 2012-09-14 13:37:32 +0000 | [diff] [blame] | 61 | #include <asm/hw_irq.h> |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 62 | |
David Vrabel | 9a489f4 | 2013-03-13 15:29:25 +0000 | [diff] [blame] | 63 | #include "events_internal.h" |
| 64 | |
David Vrabel | ab9a1cc | 2013-03-14 12:49:19 +0000 | [diff] [blame] | 65 | const struct evtchn_ops *evtchn_ops; |
| 66 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 67 | /* |
| 68 | * This lock protects updates to the following mapping and reference-count |
| 69 | * arrays. The lock does not need to be acquired to read the mapping tables. |
| 70 | */ |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 71 | static DEFINE_MUTEX(irq_mapping_update_lock); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 72 | |
Juergen Gross | 61d359d | 2020-09-07 15:47:27 +0200 | [diff] [blame^] | 73 | /* |
| 74 | * Lock protecting event handling loop against removing event channels. |
| 75 | * Adding of event channels is no issue as the associated IRQ becomes active |
| 76 | * only after everything is setup (before request_[threaded_]irq() the handler |
| 77 | * can't be entered for an event, as the event channel will be unmasked only |
| 78 | * then). |
| 79 | */ |
| 80 | static DEFINE_RWLOCK(evtchn_rwlock); |
| 81 | |
| 82 | /* |
| 83 | * Lock hierarchy: |
| 84 | * |
| 85 | * irq_mapping_update_lock |
| 86 | * evtchn_rwlock |
| 87 | * IRQ-desc lock |
| 88 | */ |
| 89 | |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 90 | static LIST_HEAD(xen_irq_list_head); |
| 91 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 92 | /* IRQ <-> VIRQ mapping. */ |
Tejun Heo | 204fba4 | 2009-06-24 15:13:45 +0900 | [diff] [blame] | 93 | static DEFINE_PER_CPU(int [NR_VIRQS], virq_to_irq) = {[0 ... NR_VIRQS-1] = -1}; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 94 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 95 | /* IRQ <-> IPI mapping */ |
Tejun Heo | 204fba4 | 2009-06-24 15:13:45 +0900 | [diff] [blame] | 96 | static DEFINE_PER_CPU(int [XEN_NR_IPIS], ipi_to_irq) = {[0 ... XEN_NR_IPIS-1] = -1}; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 97 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 98 | int **evtchn_to_irq; |
Ian Campbell | bf86ad8 | 2012-10-17 09:39:12 +0100 | [diff] [blame] | 99 | #ifdef CONFIG_X86 |
Stefano Stabellini | 9846ff1 | 2012-01-30 16:21:48 +0000 | [diff] [blame] | 100 | static unsigned long *pirq_eoi_map; |
Ian Campbell | bf86ad8 | 2012-10-17 09:39:12 +0100 | [diff] [blame] | 101 | #endif |
Stefano Stabellini | 9846ff1 | 2012-01-30 16:21:48 +0000 | [diff] [blame] | 102 | static bool (*pirq_needs_eoi)(unsigned irq); |
Jeremy Fitzhardinge | 3b32f57 | 2009-08-13 12:50:37 -0700 | [diff] [blame] | 103 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 104 | #define EVTCHN_ROW(e) (e / (PAGE_SIZE/sizeof(**evtchn_to_irq))) |
| 105 | #define EVTCHN_COL(e) (e % (PAGE_SIZE/sizeof(**evtchn_to_irq))) |
| 106 | #define EVTCHN_PER_ROW (PAGE_SIZE / sizeof(**evtchn_to_irq)) |
| 107 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 108 | /* Xen will never allocate port zero for any purpose. */ |
| 109 | #define VALID_EVTCHN(chn) ((chn) != 0) |
| 110 | |
Juergen Gross | 82856cd | 2020-09-30 11:16:14 +0200 | [diff] [blame] | 111 | static struct irq_info *legacy_info_ptrs[NR_IRQS_LEGACY]; |
| 112 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 113 | static struct irq_chip xen_dynamic_chip; |
Jeremy Fitzhardinge | aaca496 | 2010-08-20 18:57:53 -0700 | [diff] [blame] | 114 | static struct irq_chip xen_percpu_chip; |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 115 | static struct irq_chip xen_pirq_chip; |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 116 | static void enable_dynirq(struct irq_data *data); |
| 117 | static void disable_dynirq(struct irq_data *data); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 118 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 119 | static void clear_evtchn_to_irq_row(unsigned row) |
| 120 | { |
| 121 | unsigned col; |
| 122 | |
| 123 | for (col = 0; col < EVTCHN_PER_ROW; col++) |
Juergen Gross | 61d359d | 2020-09-07 15:47:27 +0200 | [diff] [blame^] | 124 | WRITE_ONCE(evtchn_to_irq[row][col], -1); |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 125 | } |
| 126 | |
| 127 | static void clear_evtchn_to_irq_all(void) |
| 128 | { |
| 129 | unsigned row; |
| 130 | |
| 131 | for (row = 0; row < EVTCHN_ROW(xen_evtchn_max_channels()); row++) { |
| 132 | if (evtchn_to_irq[row] == NULL) |
| 133 | continue; |
| 134 | clear_evtchn_to_irq_row(row); |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | static int set_evtchn_to_irq(unsigned evtchn, unsigned irq) |
| 139 | { |
| 140 | unsigned row; |
| 141 | unsigned col; |
| 142 | |
| 143 | if (evtchn >= xen_evtchn_max_channels()) |
| 144 | return -EINVAL; |
| 145 | |
| 146 | row = EVTCHN_ROW(evtchn); |
| 147 | col = EVTCHN_COL(evtchn); |
| 148 | |
| 149 | if (evtchn_to_irq[row] == NULL) { |
| 150 | /* Unallocated irq entries return -1 anyway */ |
| 151 | if (irq == -1) |
| 152 | return 0; |
| 153 | |
| 154 | evtchn_to_irq[row] = (int *)get_zeroed_page(GFP_KERNEL); |
| 155 | if (evtchn_to_irq[row] == NULL) |
| 156 | return -ENOMEM; |
| 157 | |
| 158 | clear_evtchn_to_irq_row(row); |
| 159 | } |
| 160 | |
Juergen Gross | 61d359d | 2020-09-07 15:47:27 +0200 | [diff] [blame^] | 161 | WRITE_ONCE(evtchn_to_irq[row][col], irq); |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 162 | return 0; |
| 163 | } |
| 164 | |
| 165 | int get_evtchn_to_irq(unsigned evtchn) |
| 166 | { |
| 167 | if (evtchn >= xen_evtchn_max_channels()) |
| 168 | return -1; |
| 169 | if (evtchn_to_irq[EVTCHN_ROW(evtchn)] == NULL) |
| 170 | return -1; |
Juergen Gross | 61d359d | 2020-09-07 15:47:27 +0200 | [diff] [blame^] | 171 | return READ_ONCE(evtchn_to_irq[EVTCHN_ROW(evtchn)][EVTCHN_COL(evtchn)]); |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 172 | } |
| 173 | |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 174 | /* Get info for IRQ */ |
David Vrabel | 9a489f4 | 2013-03-13 15:29:25 +0000 | [diff] [blame] | 175 | struct irq_info *info_for_irq(unsigned irq) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 176 | { |
Juergen Gross | 82856cd | 2020-09-30 11:16:14 +0200 | [diff] [blame] | 177 | if (irq < nr_legacy_irqs()) |
| 178 | return legacy_info_ptrs[irq]; |
| 179 | else |
| 180 | return irq_get_chip_data(irq); |
| 181 | } |
| 182 | |
| 183 | static void set_info_for_irq(unsigned int irq, struct irq_info *info) |
| 184 | { |
| 185 | if (irq < nr_legacy_irqs()) |
| 186 | legacy_info_ptrs[irq] = info; |
| 187 | else |
| 188 | irq_set_chip_data(irq, info); |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 189 | } |
| 190 | |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 191 | /* Constructors for packed IRQ information. */ |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 192 | static int xen_irq_info_common_setup(struct irq_info *info, |
Ian Campbell | 3d4cfa3 | 2011-03-10 16:08:10 +0000 | [diff] [blame] | 193 | unsigned irq, |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 194 | enum xen_irq_type type, |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 195 | unsigned evtchn, |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 196 | unsigned short cpu) |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 197 | { |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 198 | int ret; |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 199 | |
| 200 | BUG_ON(info->type != IRQT_UNBOUND && info->type != type); |
| 201 | |
| 202 | info->type = type; |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 203 | info->irq = irq; |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 204 | info->evtchn = evtchn; |
| 205 | info->cpu = cpu; |
Ian Campbell | 3d4cfa3 | 2011-03-10 16:08:10 +0000 | [diff] [blame] | 206 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 207 | ret = set_evtchn_to_irq(evtchn, irq); |
| 208 | if (ret < 0) |
| 209 | return ret; |
Julien Grall | 934f585 | 2013-04-30 18:29:13 +0100 | [diff] [blame] | 210 | |
| 211 | irq_clear_status_flags(irq, IRQ_NOREQUEST|IRQ_NOAUTOEN); |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 212 | |
David Vrabel | 0838587 | 2013-03-18 16:54:57 +0000 | [diff] [blame] | 213 | return xen_evtchn_port_setup(info); |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 214 | } |
| 215 | |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 216 | static int xen_irq_info_evtchn_setup(unsigned irq, |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 217 | unsigned evtchn) |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 218 | { |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 219 | struct irq_info *info = info_for_irq(irq); |
| 220 | |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 221 | return xen_irq_info_common_setup(info, irq, IRQT_EVTCHN, evtchn, 0); |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 222 | } |
| 223 | |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 224 | static int xen_irq_info_ipi_setup(unsigned cpu, |
Ian Campbell | 3d4cfa3 | 2011-03-10 16:08:10 +0000 | [diff] [blame] | 225 | unsigned irq, |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 226 | unsigned evtchn, |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 227 | enum ipi_vector ipi) |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 228 | { |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 229 | struct irq_info *info = info_for_irq(irq); |
| 230 | |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 231 | info->u.ipi = ipi; |
Ian Campbell | 3d4cfa3 | 2011-03-10 16:08:10 +0000 | [diff] [blame] | 232 | |
| 233 | per_cpu(ipi_to_irq, cpu)[ipi] = irq; |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 234 | |
| 235 | return xen_irq_info_common_setup(info, irq, IRQT_IPI, evtchn, 0); |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 236 | } |
| 237 | |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 238 | static int xen_irq_info_virq_setup(unsigned cpu, |
Ian Campbell | 3d4cfa3 | 2011-03-10 16:08:10 +0000 | [diff] [blame] | 239 | unsigned irq, |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 240 | unsigned evtchn, |
| 241 | unsigned virq) |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 242 | { |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 243 | struct irq_info *info = info_for_irq(irq); |
| 244 | |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 245 | info->u.virq = virq; |
Ian Campbell | 3d4cfa3 | 2011-03-10 16:08:10 +0000 | [diff] [blame] | 246 | |
| 247 | per_cpu(virq_to_irq, cpu)[virq] = irq; |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 248 | |
| 249 | return xen_irq_info_common_setup(info, irq, IRQT_VIRQ, evtchn, 0); |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 250 | } |
| 251 | |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 252 | static int xen_irq_info_pirq_setup(unsigned irq, |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 253 | unsigned evtchn, |
| 254 | unsigned pirq, |
| 255 | unsigned gsi, |
Konrad Rzeszutek Wilk | beafbdc | 2011-04-14 11:17:36 -0400 | [diff] [blame] | 256 | uint16_t domid, |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 257 | unsigned char flags) |
| 258 | { |
| 259 | struct irq_info *info = info_for_irq(irq); |
| 260 | |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 261 | info->u.pirq.pirq = pirq; |
| 262 | info->u.pirq.gsi = gsi; |
Konrad Rzeszutek Wilk | beafbdc | 2011-04-14 11:17:36 -0400 | [diff] [blame] | 263 | info->u.pirq.domid = domid; |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 264 | info->u.pirq.flags = flags; |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 265 | |
| 266 | return xen_irq_info_common_setup(info, irq, IRQT_PIRQ, evtchn, 0); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 267 | } |
| 268 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 269 | static void xen_irq_info_cleanup(struct irq_info *info) |
| 270 | { |
| 271 | set_evtchn_to_irq(info->evtchn, -1); |
| 272 | info->evtchn = 0; |
| 273 | } |
| 274 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 275 | /* |
| 276 | * Accessors for packed IRQ information. |
| 277 | */ |
David Vrabel | 9a489f4 | 2013-03-13 15:29:25 +0000 | [diff] [blame] | 278 | unsigned int evtchn_from_irq(unsigned irq) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 279 | { |
Juergen Gross | 61d359d | 2020-09-07 15:47:27 +0200 | [diff] [blame^] | 280 | const struct irq_info *info = NULL; |
| 281 | |
| 282 | if (likely(irq < nr_irqs)) |
| 283 | info = info_for_irq(irq); |
| 284 | if (!info) |
Joe Jin | 110e7c7 | 2011-01-07 14:50:12 +0800 | [diff] [blame] | 285 | return 0; |
| 286 | |
Juergen Gross | 61d359d | 2020-09-07 15:47:27 +0200 | [diff] [blame^] | 287 | return info->evtchn; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 288 | } |
| 289 | |
Ian Campbell | d4c0453 | 2009-02-06 19:20:31 -0800 | [diff] [blame] | 290 | unsigned irq_from_evtchn(unsigned int evtchn) |
| 291 | { |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 292 | return get_evtchn_to_irq(evtchn); |
Ian Campbell | d4c0453 | 2009-02-06 19:20:31 -0800 | [diff] [blame] | 293 | } |
| 294 | EXPORT_SYMBOL_GPL(irq_from_evtchn); |
| 295 | |
David Vrabel | 9a489f4 | 2013-03-13 15:29:25 +0000 | [diff] [blame] | 296 | int irq_from_virq(unsigned int cpu, unsigned int virq) |
| 297 | { |
| 298 | return per_cpu(virq_to_irq, cpu)[virq]; |
| 299 | } |
| 300 | |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 301 | static enum ipi_vector ipi_from_irq(unsigned irq) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 302 | { |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 303 | struct irq_info *info = info_for_irq(irq); |
| 304 | |
| 305 | BUG_ON(info == NULL); |
| 306 | BUG_ON(info->type != IRQT_IPI); |
| 307 | |
| 308 | return info->u.ipi; |
| 309 | } |
| 310 | |
| 311 | static unsigned virq_from_irq(unsigned irq) |
| 312 | { |
| 313 | struct irq_info *info = info_for_irq(irq); |
| 314 | |
| 315 | BUG_ON(info == NULL); |
| 316 | BUG_ON(info->type != IRQT_VIRQ); |
| 317 | |
| 318 | return info->u.virq; |
| 319 | } |
| 320 | |
Stefano Stabellini | 7a043f1 | 2010-07-01 17:08:14 +0100 | [diff] [blame] | 321 | static unsigned pirq_from_irq(unsigned irq) |
| 322 | { |
| 323 | struct irq_info *info = info_for_irq(irq); |
| 324 | |
| 325 | BUG_ON(info == NULL); |
| 326 | BUG_ON(info->type != IRQT_PIRQ); |
| 327 | |
| 328 | return info->u.pirq.pirq; |
| 329 | } |
| 330 | |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 331 | static enum xen_irq_type type_from_irq(unsigned irq) |
| 332 | { |
| 333 | return info_for_irq(irq)->type; |
| 334 | } |
| 335 | |
David Vrabel | 9a489f4 | 2013-03-13 15:29:25 +0000 | [diff] [blame] | 336 | unsigned cpu_from_irq(unsigned irq) |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 337 | { |
| 338 | return info_for_irq(irq)->cpu; |
| 339 | } |
| 340 | |
David Vrabel | 9a489f4 | 2013-03-13 15:29:25 +0000 | [diff] [blame] | 341 | unsigned int cpu_from_evtchn(unsigned int evtchn) |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 342 | { |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 343 | int irq = get_evtchn_to_irq(evtchn); |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 344 | unsigned ret = 0; |
| 345 | |
| 346 | if (irq != -1) |
| 347 | ret = cpu_from_irq(irq); |
| 348 | |
| 349 | return ret; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 350 | } |
| 351 | |
Ian Campbell | bf86ad8 | 2012-10-17 09:39:12 +0100 | [diff] [blame] | 352 | #ifdef CONFIG_X86 |
Stefano Stabellini | 9846ff1 | 2012-01-30 16:21:48 +0000 | [diff] [blame] | 353 | static bool pirq_check_eoi_map(unsigned irq) |
| 354 | { |
Stefano Stabellini | 521394e | 2012-04-25 16:11:38 +0100 | [diff] [blame] | 355 | return test_bit(pirq_from_irq(irq), pirq_eoi_map); |
Stefano Stabellini | 9846ff1 | 2012-01-30 16:21:48 +0000 | [diff] [blame] | 356 | } |
Ian Campbell | bf86ad8 | 2012-10-17 09:39:12 +0100 | [diff] [blame] | 357 | #endif |
Stefano Stabellini | 9846ff1 | 2012-01-30 16:21:48 +0000 | [diff] [blame] | 358 | |
| 359 | static bool pirq_needs_eoi_flag(unsigned irq) |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 360 | { |
| 361 | struct irq_info *info = info_for_irq(irq); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 362 | BUG_ON(info->type != IRQT_PIRQ); |
| 363 | |
| 364 | return info->u.pirq.flags & PIRQ_NEEDS_EOI; |
| 365 | } |
| 366 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 367 | static void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu) |
| 368 | { |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 369 | int irq = get_evtchn_to_irq(chn); |
David Vrabel | 9a489f4 | 2013-03-13 15:29:25 +0000 | [diff] [blame] | 370 | struct irq_info *info = info_for_irq(irq); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 371 | |
| 372 | BUG_ON(irq == -1); |
| 373 | #ifdef CONFIG_SMP |
Jiang Liu | c149e4c | 2015-06-03 11:46:22 +0800 | [diff] [blame] | 374 | cpumask_copy(irq_get_affinity_mask(irq), cpumask_of(cpu)); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 375 | #endif |
David Vrabel | 9a489f4 | 2013-03-13 15:29:25 +0000 | [diff] [blame] | 376 | xen_evtchn_port_bind_to_cpu(info, cpu); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 377 | |
David Vrabel | 9a489f4 | 2013-03-13 15:29:25 +0000 | [diff] [blame] | 378 | info->cpu = cpu; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 379 | } |
| 380 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 381 | /** |
| 382 | * notify_remote_via_irq - send event to remote end of event channel via irq |
| 383 | * @irq: irq of event channel to send event to |
| 384 | * |
| 385 | * Unlike notify_remote_via_evtchn(), this is safe to use across |
| 386 | * save/restore. Notifications on a broken connection are silently |
| 387 | * dropped. |
| 388 | */ |
| 389 | void notify_remote_via_irq(int irq) |
| 390 | { |
| 391 | int evtchn = evtchn_from_irq(irq); |
| 392 | |
| 393 | if (VALID_EVTCHN(evtchn)) |
| 394 | notify_remote_via_evtchn(evtchn); |
| 395 | } |
| 396 | EXPORT_SYMBOL_GPL(notify_remote_via_irq); |
| 397 | |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 398 | static void xen_irq_init(unsigned irq) |
| 399 | { |
| 400 | struct irq_info *info; |
Konrad Rzeszutek Wilk | b5328cd | 2011-06-15 14:24:29 -0400 | [diff] [blame] | 401 | #ifdef CONFIG_SMP |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 402 | /* By default all event channels notify CPU#0. */ |
Jiang Liu | c149e4c | 2015-06-03 11:46:22 +0800 | [diff] [blame] | 403 | cpumask_copy(irq_get_affinity_mask(irq), cpumask_of(0)); |
Konrad Rzeszutek Wilk | 44626e4 | 2011-03-15 16:40:33 -0400 | [diff] [blame] | 404 | #endif |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 405 | |
Ian Campbell | ca62ce8 | 2011-03-10 16:08:12 +0000 | [diff] [blame] | 406 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
| 407 | if (info == NULL) |
| 408 | panic("Unable to allocate metadata for IRQ%d\n", irq); |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 409 | |
| 410 | info->type = IRQT_UNBOUND; |
Daniel De Graaf | 420eb55 | 2011-10-27 17:58:47 -0400 | [diff] [blame] | 411 | info->refcnt = -1; |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 412 | |
Juergen Gross | 82856cd | 2020-09-30 11:16:14 +0200 | [diff] [blame] | 413 | set_info_for_irq(irq, info); |
Ian Campbell | ca62ce8 | 2011-03-10 16:08:12 +0000 | [diff] [blame] | 414 | |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 415 | list_add_tail(&info->list, &xen_irq_list_head); |
| 416 | } |
| 417 | |
Roger Pau Monne | 4892c9b | 2014-02-27 19:15:35 +0100 | [diff] [blame] | 418 | static int __must_check xen_allocate_irqs_dynamic(int nvec) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 419 | { |
Thomas Gleixner | d07c9f1 | 2014-05-07 15:44:10 +0000 | [diff] [blame] | 420 | int i, irq = irq_alloc_descs(-1, 0, nvec, -1); |
Ian Campbell | 8991150 | 2011-03-03 11:57:44 -0500 | [diff] [blame] | 421 | |
Roger Pau Monne | 4892c9b | 2014-02-27 19:15:35 +0100 | [diff] [blame] | 422 | if (irq >= 0) { |
| 423 | for (i = 0; i < nvec; i++) |
| 424 | xen_irq_init(irq + i); |
| 425 | } |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 426 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 427 | return irq; |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 428 | } |
| 429 | |
Roger Pau Monne | 4892c9b | 2014-02-27 19:15:35 +0100 | [diff] [blame] | 430 | static inline int __must_check xen_allocate_irq_dynamic(void) |
| 431 | { |
| 432 | |
| 433 | return xen_allocate_irqs_dynamic(1); |
| 434 | } |
| 435 | |
Ian Campbell | 7bee976 | 2011-03-10 16:08:15 +0000 | [diff] [blame] | 436 | static int __must_check xen_allocate_irq_gsi(unsigned gsi) |
Ian Campbell | c9df1ce | 2011-01-11 17:20:15 +0000 | [diff] [blame] | 437 | { |
| 438 | int irq; |
| 439 | |
Ian Campbell | 8991150 | 2011-03-03 11:57:44 -0500 | [diff] [blame] | 440 | /* |
| 441 | * A PV guest has no concept of a GSI (since it has no ACPI |
| 442 | * nor access to/knowledge of the physical APICs). Therefore |
| 443 | * all IRQs are dynamically allocated from the entire IRQ |
| 444 | * space. |
| 445 | */ |
| 446 | if (xen_pv_domain() && !xen_initial_domain()) |
Ian Campbell | c9df1ce | 2011-01-11 17:20:15 +0000 | [diff] [blame] | 447 | return xen_allocate_irq_dynamic(); |
| 448 | |
| 449 | /* Legacy IRQ descriptors are already allocated by the arch. */ |
Boris Ostrovsky | b4ff838 | 2015-11-20 11:25:04 -0500 | [diff] [blame] | 450 | if (gsi < nr_legacy_irqs()) |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 451 | irq = gsi; |
| 452 | else |
| 453 | irq = irq_alloc_desc_at(gsi, -1); |
Ian Campbell | c9df1ce | 2011-01-11 17:20:15 +0000 | [diff] [blame] | 454 | |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 455 | xen_irq_init(irq); |
Ian Campbell | c9df1ce | 2011-01-11 17:20:15 +0000 | [diff] [blame] | 456 | |
| 457 | return irq; |
| 458 | } |
| 459 | |
| 460 | static void xen_free_irq(unsigned irq) |
| 461 | { |
Juergen Gross | 82856cd | 2020-09-30 11:16:14 +0200 | [diff] [blame] | 462 | struct irq_info *info = info_for_irq(irq); |
Juergen Gross | 61d359d | 2020-09-07 15:47:27 +0200 | [diff] [blame^] | 463 | unsigned long flags; |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 464 | |
Konrad Rzeszutek Wilk | 94032c5 | 2013-04-16 10:55:18 -0400 | [diff] [blame] | 465 | if (WARN_ON(!info)) |
| 466 | return; |
| 467 | |
Juergen Gross | 61d359d | 2020-09-07 15:47:27 +0200 | [diff] [blame^] | 468 | write_lock_irqsave(&evtchn_rwlock, flags); |
| 469 | |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 470 | list_del(&info->list); |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 471 | |
Juergen Gross | 82856cd | 2020-09-30 11:16:14 +0200 | [diff] [blame] | 472 | set_info_for_irq(irq, NULL); |
Ian Campbell | ca62ce8 | 2011-03-10 16:08:12 +0000 | [diff] [blame] | 473 | |
Daniel De Graaf | 420eb55 | 2011-10-27 17:58:47 -0400 | [diff] [blame] | 474 | WARN_ON(info->refcnt > 0); |
| 475 | |
Juergen Gross | 61d359d | 2020-09-07 15:47:27 +0200 | [diff] [blame^] | 476 | write_unlock_irqrestore(&evtchn_rwlock, flags); |
| 477 | |
Ian Campbell | ca62ce8 | 2011-03-10 16:08:12 +0000 | [diff] [blame] | 478 | kfree(info); |
| 479 | |
Ian Campbell | 7214610 | 2011-02-03 09:49:35 +0000 | [diff] [blame] | 480 | /* Legacy IRQ descriptors are managed by the arch. */ |
Boris Ostrovsky | b4ff838 | 2015-11-20 11:25:04 -0500 | [diff] [blame] | 481 | if (irq < nr_legacy_irqs()) |
Ian Campbell | 7214610 | 2011-02-03 09:49:35 +0000 | [diff] [blame] | 482 | return; |
| 483 | |
Ian Campbell | c9df1ce | 2011-01-11 17:20:15 +0000 | [diff] [blame] | 484 | irq_free_desc(irq); |
| 485 | } |
| 486 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 487 | static void xen_evtchn_close(unsigned int port) |
| 488 | { |
| 489 | struct evtchn_close close; |
| 490 | |
| 491 | close.port = port; |
| 492 | if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0) |
| 493 | BUG(); |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 494 | } |
| 495 | |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 496 | static void pirq_query_unmask(int irq) |
| 497 | { |
| 498 | struct physdev_irq_status_query irq_status; |
| 499 | struct irq_info *info = info_for_irq(irq); |
| 500 | |
| 501 | BUG_ON(info->type != IRQT_PIRQ); |
| 502 | |
Stefano Stabellini | 7a043f1 | 2010-07-01 17:08:14 +0100 | [diff] [blame] | 503 | irq_status.irq = pirq_from_irq(irq); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 504 | if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status)) |
| 505 | irq_status.flags = 0; |
| 506 | |
| 507 | info->u.pirq.flags &= ~PIRQ_NEEDS_EOI; |
| 508 | if (irq_status.flags & XENIRQSTAT_needs_eoi) |
| 509 | info->u.pirq.flags |= PIRQ_NEEDS_EOI; |
| 510 | } |
| 511 | |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 512 | static void eoi_pirq(struct irq_data *data) |
| 513 | { |
| 514 | int evtchn = evtchn_from_irq(data->irq); |
| 515 | struct physdev_eoi eoi = { .irq = pirq_from_irq(data->irq) }; |
| 516 | int rc = 0; |
| 517 | |
Boris Ostrovsky | ff1e22e | 2016-03-18 10:11:07 -0400 | [diff] [blame] | 518 | if (!VALID_EVTCHN(evtchn)) |
| 519 | return; |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 520 | |
Ross Lagerwall | f0f3938 | 2016-05-10 16:11:00 +0100 | [diff] [blame] | 521 | if (unlikely(irqd_is_setaffinity_pending(data)) && |
| 522 | likely(!irqd_irq_disabled(data))) { |
Boris Ostrovsky | ff1e22e | 2016-03-18 10:11:07 -0400 | [diff] [blame] | 523 | int masked = test_and_set_mask(evtchn); |
| 524 | |
| 525 | clear_evtchn(evtchn); |
| 526 | |
| 527 | irq_move_masked_irq(data); |
| 528 | |
| 529 | if (!masked) |
| 530 | unmask_evtchn(evtchn); |
| 531 | } else |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 532 | clear_evtchn(evtchn); |
| 533 | |
| 534 | if (pirq_needs_eoi(data->irq)) { |
| 535 | rc = HYPERVISOR_physdev_op(PHYSDEVOP_eoi, &eoi); |
| 536 | WARN_ON(rc); |
| 537 | } |
| 538 | } |
| 539 | |
| 540 | static void mask_ack_pirq(struct irq_data *data) |
| 541 | { |
| 542 | disable_dynirq(data); |
| 543 | eoi_pirq(data); |
| 544 | } |
| 545 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 546 | static unsigned int __startup_pirq(unsigned int irq) |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 547 | { |
| 548 | struct evtchn_bind_pirq bind_pirq; |
| 549 | struct irq_info *info = info_for_irq(irq); |
| 550 | int evtchn = evtchn_from_irq(irq); |
Konrad Rzeszutek Wilk | 15ebbb8 | 2010-10-04 13:43:27 -0400 | [diff] [blame] | 551 | int rc; |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 552 | |
| 553 | BUG_ON(info->type != IRQT_PIRQ); |
| 554 | |
| 555 | if (VALID_EVTCHN(evtchn)) |
| 556 | goto out; |
| 557 | |
Stefano Stabellini | 7a043f1 | 2010-07-01 17:08:14 +0100 | [diff] [blame] | 558 | bind_pirq.pirq = pirq_from_irq(irq); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 559 | /* NB. We are happy to share unless we are probing. */ |
Konrad Rzeszutek Wilk | 15ebbb8 | 2010-10-04 13:43:27 -0400 | [diff] [blame] | 560 | bind_pirq.flags = info->u.pirq.flags & PIRQ_SHAREABLE ? |
| 561 | BIND_PIRQ__WILL_SHARE : 0; |
| 562 | rc = HYPERVISOR_event_channel_op(EVTCHNOP_bind_pirq, &bind_pirq); |
| 563 | if (rc != 0) { |
Thomas Gleixner | 02893af | 2014-02-23 21:40:20 +0000 | [diff] [blame] | 564 | pr_warn("Failed to obtain physical IRQ %d\n", irq); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 565 | return 0; |
| 566 | } |
| 567 | evtchn = bind_pirq.port; |
| 568 | |
| 569 | pirq_query_unmask(irq); |
| 570 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 571 | rc = set_evtchn_to_irq(evtchn, irq); |
Juergen Gross | 85e40b0 | 2015-02-26 06:52:05 +0100 | [diff] [blame] | 572 | if (rc) |
| 573 | goto err; |
| 574 | |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 575 | info->evtchn = evtchn; |
Boris Ostrovsky | 16e6bd5 | 2015-04-29 17:10:15 -0400 | [diff] [blame] | 576 | bind_evtchn_to_cpu(evtchn, 0); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 577 | |
Juergen Gross | 85e40b0 | 2015-02-26 06:52:05 +0100 | [diff] [blame] | 578 | rc = xen_evtchn_port_setup(info); |
| 579 | if (rc) |
| 580 | goto err; |
| 581 | |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 582 | out: |
| 583 | unmask_evtchn(evtchn); |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 584 | eoi_pirq(irq_get_irq_data(irq)); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 585 | |
| 586 | return 0; |
Juergen Gross | 85e40b0 | 2015-02-26 06:52:05 +0100 | [diff] [blame] | 587 | |
| 588 | err: |
| 589 | pr_err("irq%d: Failed to set port to irq mapping (%d)\n", irq, rc); |
| 590 | xen_evtchn_close(evtchn); |
| 591 | return 0; |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 592 | } |
| 593 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 594 | static unsigned int startup_pirq(struct irq_data *data) |
| 595 | { |
| 596 | return __startup_pirq(data->irq); |
| 597 | } |
| 598 | |
| 599 | static void shutdown_pirq(struct irq_data *data) |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 600 | { |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 601 | unsigned int irq = data->irq; |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 602 | struct irq_info *info = info_for_irq(irq); |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 603 | unsigned evtchn = evtchn_from_irq(irq); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 604 | |
| 605 | BUG_ON(info->type != IRQT_PIRQ); |
| 606 | |
| 607 | if (!VALID_EVTCHN(evtchn)) |
| 608 | return; |
| 609 | |
| 610 | mask_evtchn(evtchn); |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 611 | xen_evtchn_close(evtchn); |
| 612 | xen_irq_info_cleanup(info); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 613 | } |
| 614 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 615 | static void enable_pirq(struct irq_data *data) |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 616 | { |
Liu Shuo | 020db9d | 2017-07-30 00:59:57 +0800 | [diff] [blame] | 617 | enable_dynirq(data); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 618 | } |
| 619 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 620 | static void disable_pirq(struct irq_data *data) |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 621 | { |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 622 | disable_dynirq(data); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 623 | } |
| 624 | |
Stefano Stabellini | 68c2c39 | 2012-05-21 16:54:10 +0100 | [diff] [blame] | 625 | int xen_irq_from_gsi(unsigned gsi) |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 626 | { |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 627 | struct irq_info *info; |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 628 | |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 629 | list_for_each_entry(info, &xen_irq_list_head, list) { |
| 630 | if (info->type != IRQT_PIRQ) |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 631 | continue; |
| 632 | |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 633 | if (info->u.pirq.gsi == gsi) |
| 634 | return info->irq; |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 635 | } |
| 636 | |
| 637 | return -1; |
| 638 | } |
Stefano Stabellini | 68c2c39 | 2012-05-21 16:54:10 +0100 | [diff] [blame] | 639 | EXPORT_SYMBOL_GPL(xen_irq_from_gsi); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 640 | |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 641 | static void __unbind_from_irq(unsigned int irq) |
| 642 | { |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 643 | int evtchn = evtchn_from_irq(irq); |
Juergen Gross | 82856cd | 2020-09-30 11:16:14 +0200 | [diff] [blame] | 644 | struct irq_info *info = info_for_irq(irq); |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 645 | |
| 646 | if (info->refcnt > 0) { |
| 647 | info->refcnt--; |
| 648 | if (info->refcnt != 0) |
| 649 | return; |
| 650 | } |
| 651 | |
| 652 | if (VALID_EVTCHN(evtchn)) { |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 653 | unsigned int cpu = cpu_from_irq(irq); |
| 654 | |
| 655 | xen_evtchn_close(evtchn); |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 656 | |
| 657 | switch (type_from_irq(irq)) { |
| 658 | case IRQT_VIRQ: |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 659 | per_cpu(virq_to_irq, cpu)[virq_from_irq(irq)] = -1; |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 660 | break; |
| 661 | case IRQT_IPI: |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 662 | per_cpu(ipi_to_irq, cpu)[ipi_from_irq(irq)] = -1; |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 663 | break; |
| 664 | default: |
| 665 | break; |
| 666 | } |
| 667 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 668 | xen_irq_info_cleanup(info); |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 669 | } |
| 670 | |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 671 | xen_free_irq(irq); |
| 672 | } |
| 673 | |
Ian Campbell | 653378a | 2011-03-10 16:08:04 +0000 | [diff] [blame] | 674 | /* |
| 675 | * Do not make any assumptions regarding the relationship between the |
| 676 | * IRQ number returned here and the Xen pirq argument. |
Stefano Stabellini | 7a043f1 | 2010-07-01 17:08:14 +0100 | [diff] [blame] | 677 | * |
| 678 | * Note: We don't assign an event channel until the irq actually started |
| 679 | * up. Return an existing irq if we've already got one for the gsi. |
Stefano Stabellini | e5ac0bd | 2011-05-25 12:33:23 +0100 | [diff] [blame] | 680 | * |
| 681 | * Shareable implies level triggered, not shareable implies edge |
| 682 | * triggered here. |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 683 | */ |
Ian Campbell | f4d0635 | 2011-03-10 16:08:07 +0000 | [diff] [blame] | 684 | int xen_bind_pirq_gsi_to_irq(unsigned gsi, |
| 685 | unsigned pirq, int shareable, char *name) |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 686 | { |
Ian Campbell | a0e1811 | 2011-03-10 16:08:03 +0000 | [diff] [blame] | 687 | int irq = -1; |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 688 | struct physdev_irq irq_op; |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 689 | int ret; |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 690 | |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 691 | mutex_lock(&irq_mapping_update_lock); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 692 | |
Stefano Stabellini | 68c2c39 | 2012-05-21 16:54:10 +0100 | [diff] [blame] | 693 | irq = xen_irq_from_gsi(gsi); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 694 | if (irq != -1) { |
Joe Perches | 283c097 | 2013-06-28 03:21:41 -0700 | [diff] [blame] | 695 | pr_info("%s: returning irq %d for gsi %u\n", |
| 696 | __func__, irq, gsi); |
Daniel De Graaf | 420eb55 | 2011-10-27 17:58:47 -0400 | [diff] [blame] | 697 | goto out; |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 698 | } |
| 699 | |
Ian Campbell | c9df1ce | 2011-01-11 17:20:15 +0000 | [diff] [blame] | 700 | irq = xen_allocate_irq_gsi(gsi); |
Ian Campbell | 7bee976 | 2011-03-10 16:08:15 +0000 | [diff] [blame] | 701 | if (irq < 0) |
| 702 | goto out; |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 703 | |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 704 | irq_op.irq = irq; |
Alex Nixon | b5401a9 | 2010-03-18 16:31:34 -0400 | [diff] [blame] | 705 | 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 Campbell | c9df1ce | 2011-01-11 17:20:15 +0000 | [diff] [blame] | 712 | xen_free_irq(irq); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 713 | irq = -ENOSPC; |
| 714 | goto out; |
| 715 | } |
| 716 | |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 717 | ret = xen_irq_info_pirq_setup(irq, 0, pirq, gsi, DOMID_SELF, |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 718 | shareable ? PIRQ_SHAREABLE : 0); |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 719 | if (ret < 0) { |
| 720 | __unbind_from_irq(irq); |
| 721 | irq = ret; |
| 722 | goto out; |
| 723 | } |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 724 | |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 725 | pirq_query_unmask(irq); |
| 726 | /* We try to use the handler with the appropriate semantic for the |
Stefano Stabellini | e5ac0bd | 2011-05-25 12:33:23 +0100 | [diff] [blame] | 727 | * type of interrupt: if the interrupt is an edge triggered |
| 728 | * interrupt we use handle_edge_irq. |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 729 | * |
Stefano Stabellini | e5ac0bd | 2011-05-25 12:33:23 +0100 | [diff] [blame] | 730 | * On the other hand if the interrupt is level triggered we use |
| 731 | * handle_fasteoi_irq like the native code does for this kind of |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 732 | * interrupts. |
Stefano Stabellini | e5ac0bd | 2011-05-25 12:33:23 +0100 | [diff] [blame] | 733 | * |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 734 | * Depending on the Xen version, pirq_needs_eoi might return true |
| 735 | * not only for level triggered interrupts but for edge triggered |
| 736 | * interrupts too. In any case Xen always honors the eoi mechanism, |
| 737 | * not injecting any more pirqs of the same kind if the first one |
| 738 | * hasn't received an eoi yet. Therefore using the fasteoi handler |
| 739 | * is the right choice either way. |
| 740 | */ |
Stefano Stabellini | e5ac0bd | 2011-05-25 12:33:23 +0100 | [diff] [blame] | 741 | if (shareable) |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 742 | irq_set_chip_and_handler_name(irq, &xen_pirq_chip, |
| 743 | handle_fasteoi_irq, name); |
| 744 | else |
| 745 | irq_set_chip_and_handler_name(irq, &xen_pirq_chip, |
| 746 | handle_edge_irq, name); |
| 747 | |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 748 | out: |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 749 | mutex_unlock(&irq_mapping_update_lock); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 750 | |
| 751 | return irq; |
| 752 | } |
| 753 | |
Qing He | f731e3ef | 2010-10-11 15:30:09 +0100 | [diff] [blame] | 754 | #ifdef CONFIG_PCI_MSI |
Ian Campbell | bf480d9 | 2011-02-18 16:43:32 +0000 | [diff] [blame] | 755 | int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc) |
Ian Campbell | cbf6aa8 | 2011-01-11 17:20:14 +0000 | [diff] [blame] | 756 | { |
Ian Campbell | 5cad61a | 2011-02-18 16:43:31 +0000 | [diff] [blame] | 757 | int rc; |
Ian Campbell | cbf6aa8 | 2011-01-11 17:20:14 +0000 | [diff] [blame] | 758 | struct physdev_get_free_pirq op_get_free_pirq; |
Ian Campbell | 5cad61a | 2011-02-18 16:43:31 +0000 | [diff] [blame] | 759 | |
Ian Campbell | bf480d9 | 2011-02-18 16:43:32 +0000 | [diff] [blame] | 760 | op_get_free_pirq.type = MAP_PIRQ_TYPE_MSI; |
Ian Campbell | cbf6aa8 | 2011-01-11 17:20:14 +0000 | [diff] [blame] | 761 | rc = HYPERVISOR_physdev_op(PHYSDEVOP_get_free_pirq, &op_get_free_pirq); |
Ian Campbell | cbf6aa8 | 2011-01-11 17:20:14 +0000 | [diff] [blame] | 762 | |
Ian Campbell | 5cad61a | 2011-02-18 16:43:31 +0000 | [diff] [blame] | 763 | WARN_ONCE(rc == -ENOSYS, |
| 764 | "hypervisor does not support the PHYSDEVOP_get_free_pirq interface\n"); |
| 765 | |
| 766 | return rc ? -1 : op_get_free_pirq.pirq; |
Ian Campbell | cbf6aa8 | 2011-01-11 17:20:14 +0000 | [diff] [blame] | 767 | } |
| 768 | |
Ian Campbell | bf480d9 | 2011-02-18 16:43:32 +0000 | [diff] [blame] | 769 | int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc, |
Roger Pau Monne | 4892c9b | 2014-02-27 19:15:35 +0100 | [diff] [blame] | 770 | int pirq, int nvec, const char *name, domid_t domid) |
Stefano Stabellini | 809f926 | 2010-07-01 17:10:39 +0100 | [diff] [blame] | 771 | { |
Roger Pau Monne | 4892c9b | 2014-02-27 19:15:35 +0100 | [diff] [blame] | 772 | int i, irq, ret; |
Ian Campbell | 4b41df7 | 2011-02-18 16:43:29 +0000 | [diff] [blame] | 773 | |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 774 | mutex_lock(&irq_mapping_update_lock); |
Stefano Stabellini | 809f926 | 2010-07-01 17:10:39 +0100 | [diff] [blame] | 775 | |
Roger Pau Monne | 4892c9b | 2014-02-27 19:15:35 +0100 | [diff] [blame] | 776 | irq = xen_allocate_irqs_dynamic(nvec); |
Konrad Rzeszutek Wilk | e659922 | 2011-09-29 13:26:45 -0400 | [diff] [blame] | 777 | if (irq < 0) |
Ian Campbell | bb5d079 | 2011-02-18 16:43:28 +0000 | [diff] [blame] | 778 | goto out; |
Stefano Stabellini | 809f926 | 2010-07-01 17:10:39 +0100 | [diff] [blame] | 779 | |
Roger Pau Monne | 4892c9b | 2014-02-27 19:15:35 +0100 | [diff] [blame] | 780 | for (i = 0; i < nvec; i++) { |
| 781 | irq_set_chip_and_handler_name(irq + i, &xen_pirq_chip, handle_edge_irq, name); |
Stefano Stabellini | 809f926 | 2010-07-01 17:10:39 +0100 | [diff] [blame] | 782 | |
Roger Pau Monne | 4892c9b | 2014-02-27 19:15:35 +0100 | [diff] [blame] | 783 | ret = xen_irq_info_pirq_setup(irq + i, 0, pirq + i, 0, domid, |
| 784 | i == 0 ? 0 : PIRQ_MSI_GROUP); |
| 785 | if (ret < 0) |
| 786 | goto error_irq; |
| 787 | } |
| 788 | |
Linus Torvalds | 5f6fb45 | 2011-03-15 19:23:40 -0700 | [diff] [blame] | 789 | ret = irq_set_msi_desc(irq, msidesc); |
Ian Campbell | bf480d9 | 2011-02-18 16:43:32 +0000 | [diff] [blame] | 790 | if (ret < 0) |
| 791 | goto error_irq; |
Stefano Stabellini | 809f926 | 2010-07-01 17:10:39 +0100 | [diff] [blame] | 792 | out: |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 793 | mutex_unlock(&irq_mapping_update_lock); |
Ian Campbell | 4b41df7 | 2011-02-18 16:43:29 +0000 | [diff] [blame] | 794 | return irq; |
Ian Campbell | bf480d9 | 2011-02-18 16:43:32 +0000 | [diff] [blame] | 795 | error_irq: |
Roger Pau Monne | 910f8be | 2018-02-28 09:19:03 +0000 | [diff] [blame] | 796 | while (nvec--) |
| 797 | __unbind_from_irq(irq + nvec); |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 798 | mutex_unlock(&irq_mapping_update_lock); |
Konrad Rzeszutek Wilk | e659922 | 2011-09-29 13:26:45 -0400 | [diff] [blame] | 799 | return ret; |
Stefano Stabellini | 809f926 | 2010-07-01 17:10:39 +0100 | [diff] [blame] | 800 | } |
Qing He | f731e3ef | 2010-10-11 15:30:09 +0100 | [diff] [blame] | 801 | #endif |
| 802 | |
Alex Nixon | b5401a9 | 2010-03-18 16:31:34 -0400 | [diff] [blame] | 803 | int xen_destroy_irq(int irq) |
| 804 | { |
Jeremy Fitzhardinge | 38aa66f | 2010-09-02 14:51:39 +0100 | [diff] [blame] | 805 | struct physdev_unmap_pirq unmap_irq; |
| 806 | struct irq_info *info = info_for_irq(irq); |
Alex Nixon | b5401a9 | 2010-03-18 16:31:34 -0400 | [diff] [blame] | 807 | int rc = -ENOENT; |
| 808 | |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 809 | mutex_lock(&irq_mapping_update_lock); |
Alex Nixon | b5401a9 | 2010-03-18 16:31:34 -0400 | [diff] [blame] | 810 | |
Roger Pau Monne | 4892c9b | 2014-02-27 19:15:35 +0100 | [diff] [blame] | 811 | /* |
| 812 | * If trying to remove a vector in a MSI group different |
| 813 | * than the first one skip the PIRQ unmap unless this vector |
| 814 | * is the first one in the group. |
| 815 | */ |
| 816 | if (xen_initial_domain() && !(info->u.pirq.flags & PIRQ_MSI_GROUP)) { |
Konrad Rzeszutek Wilk | 1233471 | 2010-11-19 11:27:09 -0500 | [diff] [blame] | 817 | unmap_irq.pirq = info->u.pirq.pirq; |
Konrad Rzeszutek Wilk | beafbdc | 2011-04-14 11:17:36 -0400 | [diff] [blame] | 818 | unmap_irq.domid = info->u.pirq.domid; |
Jeremy Fitzhardinge | 38aa66f | 2010-09-02 14:51:39 +0100 | [diff] [blame] | 819 | rc = HYPERVISOR_physdev_op(PHYSDEVOP_unmap_pirq, &unmap_irq); |
Konrad Rzeszutek Wilk | 1eff1ad | 2011-02-16 16:26:44 -0500 | [diff] [blame] | 820 | /* If another domain quits without making the pci_disable_msix |
| 821 | * call, the Xen hypervisor takes care of freeing the PIRQs |
| 822 | * (free_domain_pirqs). |
| 823 | */ |
| 824 | if ((rc == -ESRCH && info->u.pirq.domid != DOMID_SELF)) |
Joe Perches | 283c097 | 2013-06-28 03:21:41 -0700 | [diff] [blame] | 825 | pr_info("domain %d does not have %d anymore\n", |
Konrad Rzeszutek Wilk | 1eff1ad | 2011-02-16 16:26:44 -0500 | [diff] [blame] | 826 | info->u.pirq.domid, info->u.pirq.pirq); |
| 827 | else if (rc) { |
Joe Perches | 283c097 | 2013-06-28 03:21:41 -0700 | [diff] [blame] | 828 | pr_warn("unmap irq failed %d\n", rc); |
Jeremy Fitzhardinge | 38aa66f | 2010-09-02 14:51:39 +0100 | [diff] [blame] | 829 | goto out; |
| 830 | } |
| 831 | } |
Alex Nixon | b5401a9 | 2010-03-18 16:31:34 -0400 | [diff] [blame] | 832 | |
Ian Campbell | c9df1ce | 2011-01-11 17:20:15 +0000 | [diff] [blame] | 833 | xen_free_irq(irq); |
Alex Nixon | b5401a9 | 2010-03-18 16:31:34 -0400 | [diff] [blame] | 834 | |
| 835 | out: |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 836 | mutex_unlock(&irq_mapping_update_lock); |
Alex Nixon | b5401a9 | 2010-03-18 16:31:34 -0400 | [diff] [blame] | 837 | return rc; |
| 838 | } |
| 839 | |
Stefano Stabellini | af42b8d | 2010-12-01 14:51:44 +0000 | [diff] [blame] | 840 | int xen_irq_from_pirq(unsigned pirq) |
| 841 | { |
Ian Campbell | 69c358c | 2011-03-10 16:08:13 +0000 | [diff] [blame] | 842 | int irq; |
| 843 | |
| 844 | struct irq_info *info; |
| 845 | |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 846 | mutex_lock(&irq_mapping_update_lock); |
Ian Campbell | 69c358c | 2011-03-10 16:08:13 +0000 | [diff] [blame] | 847 | |
| 848 | list_for_each_entry(info, &xen_irq_list_head, list) { |
Konrad Rzeszutek Wilk | 9bb9efe | 2011-09-29 13:13:30 -0400 | [diff] [blame] | 849 | if (info->type != IRQT_PIRQ) |
Ian Campbell | 69c358c | 2011-03-10 16:08:13 +0000 | [diff] [blame] | 850 | continue; |
| 851 | irq = info->irq; |
| 852 | if (info->u.pirq.pirq == pirq) |
| 853 | goto out; |
| 854 | } |
| 855 | irq = -1; |
| 856 | out: |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 857 | mutex_unlock(&irq_mapping_update_lock); |
Ian Campbell | 69c358c | 2011-03-10 16:08:13 +0000 | [diff] [blame] | 858 | |
| 859 | return irq; |
Stefano Stabellini | af42b8d | 2010-12-01 14:51:44 +0000 | [diff] [blame] | 860 | } |
| 861 | |
Konrad Rzeszutek Wilk | e6197ac | 2011-02-24 14:20:12 -0500 | [diff] [blame] | 862 | |
| 863 | int xen_pirq_from_irq(unsigned irq) |
| 864 | { |
| 865 | return pirq_from_irq(irq); |
| 866 | } |
| 867 | EXPORT_SYMBOL_GPL(xen_pirq_from_irq); |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 868 | |
Jeremy Fitzhardinge | b536b4b | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 869 | int bind_evtchn_to_irq(unsigned int evtchn) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 870 | { |
| 871 | int irq; |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 872 | int ret; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 873 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 874 | if (evtchn >= xen_evtchn_max_channels()) |
| 875 | return -ENOMEM; |
| 876 | |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 877 | mutex_lock(&irq_mapping_update_lock); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 878 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 879 | irq = get_evtchn_to_irq(evtchn); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 880 | |
| 881 | if (irq == -1) { |
Ian Campbell | c9df1ce | 2011-01-11 17:20:15 +0000 | [diff] [blame] | 882 | irq = xen_allocate_irq_dynamic(); |
Wei Liu | 68ba45f | 2013-01-31 14:46:56 +0000 | [diff] [blame] | 883 | if (irq < 0) |
Ian Campbell | 7bee976 | 2011-03-10 16:08:15 +0000 | [diff] [blame] | 884 | goto out; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 885 | |
Thomas Gleixner | c442b80 | 2011-03-25 10:58:06 +0100 | [diff] [blame] | 886 | irq_set_chip_and_handler_name(irq, &xen_dynamic_chip, |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 887 | handle_edge_irq, "event"); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 888 | |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 889 | ret = xen_irq_info_evtchn_setup(irq, evtchn); |
| 890 | if (ret < 0) { |
| 891 | __unbind_from_irq(irq); |
| 892 | irq = ret; |
| 893 | goto out; |
| 894 | } |
David Vrabel | 97253ee | 2014-02-05 14:13:10 +0000 | [diff] [blame] | 895 | /* New interdomain events are bound to VCPU 0. */ |
| 896 | bind_evtchn_to_cpu(evtchn, 0); |
Konrad Rzeszutek Wilk | 5e152e6 | 2012-05-23 13:28:44 -0400 | [diff] [blame] | 897 | } else { |
| 898 | struct irq_info *info = info_for_irq(irq); |
| 899 | WARN_ON(info == NULL || info->type != IRQT_EVTCHN); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 900 | } |
| 901 | |
Ian Campbell | 7bee976 | 2011-03-10 16:08:15 +0000 | [diff] [blame] | 902 | out: |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 903 | mutex_unlock(&irq_mapping_update_lock); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 904 | |
| 905 | return irq; |
| 906 | } |
Jeremy Fitzhardinge | b536b4b | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 907 | EXPORT_SYMBOL_GPL(bind_evtchn_to_irq); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 908 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 909 | static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu) |
| 910 | { |
| 911 | struct evtchn_bind_ipi bind_ipi; |
| 912 | int evtchn, irq; |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 913 | int ret; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 914 | |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 915 | mutex_lock(&irq_mapping_update_lock); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 916 | |
| 917 | irq = per_cpu(ipi_to_irq, cpu)[ipi]; |
Ian Campbell | 90af951 | 2009-02-06 16:55:58 -0800 | [diff] [blame] | 918 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 919 | if (irq == -1) { |
Ian Campbell | c9df1ce | 2011-01-11 17:20:15 +0000 | [diff] [blame] | 920 | irq = xen_allocate_irq_dynamic(); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 921 | if (irq < 0) |
| 922 | goto out; |
| 923 | |
Thomas Gleixner | c442b80 | 2011-03-25 10:58:06 +0100 | [diff] [blame] | 924 | irq_set_chip_and_handler_name(irq, &xen_percpu_chip, |
Jeremy Fitzhardinge | aaca496 | 2010-08-20 18:57:53 -0700 | [diff] [blame] | 925 | handle_percpu_irq, "ipi"); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 926 | |
Vitaly Kuznetsov | 8058c0b | 2016-06-30 17:56:40 +0200 | [diff] [blame] | 927 | bind_ipi.vcpu = xen_vcpu_nr(cpu); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 928 | if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi, |
| 929 | &bind_ipi) != 0) |
| 930 | BUG(); |
| 931 | evtchn = bind_ipi.port; |
| 932 | |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 933 | ret = xen_irq_info_ipi_setup(cpu, irq, evtchn, ipi); |
| 934 | if (ret < 0) { |
| 935 | __unbind_from_irq(irq); |
| 936 | irq = ret; |
| 937 | goto out; |
| 938 | } |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 939 | bind_evtchn_to_cpu(evtchn, cpu); |
Konrad Rzeszutek Wilk | 5e152e6 | 2012-05-23 13:28:44 -0400 | [diff] [blame] | 940 | } else { |
| 941 | struct irq_info *info = info_for_irq(irq); |
| 942 | WARN_ON(info == NULL || info->type != IRQT_IPI); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 943 | } |
| 944 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 945 | out: |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 946 | mutex_unlock(&irq_mapping_update_lock); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 947 | return irq; |
| 948 | } |
| 949 | |
Juergen Gross | 854072d | 2014-08-28 06:44:09 +0200 | [diff] [blame] | 950 | int bind_interdomain_evtchn_to_irq(unsigned int remote_domain, |
| 951 | unsigned int remote_port) |
Ian Campbell | 2e820f5 | 2009-02-09 12:05:50 -0800 | [diff] [blame] | 952 | { |
| 953 | struct evtchn_bind_interdomain bind_interdomain; |
| 954 | int err; |
| 955 | |
| 956 | bind_interdomain.remote_dom = remote_domain; |
| 957 | bind_interdomain.remote_port = remote_port; |
| 958 | |
| 959 | err = HYPERVISOR_event_channel_op(EVTCHNOP_bind_interdomain, |
| 960 | &bind_interdomain); |
| 961 | |
| 962 | return err ? : bind_evtchn_to_irq(bind_interdomain.local_port); |
| 963 | } |
Juergen Gross | 854072d | 2014-08-28 06:44:09 +0200 | [diff] [blame] | 964 | EXPORT_SYMBOL_GPL(bind_interdomain_evtchn_to_irq); |
Ian Campbell | 2e820f5 | 2009-02-09 12:05:50 -0800 | [diff] [blame] | 965 | |
Olaf Hering | 62cc5fc | 2011-08-25 18:30:48 +0200 | [diff] [blame] | 966 | static int find_virq(unsigned int virq, unsigned int cpu) |
| 967 | { |
| 968 | struct evtchn_status status; |
| 969 | int port, rc = -ENOENT; |
| 970 | |
| 971 | memset(&status, 0, sizeof(status)); |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 972 | for (port = 0; port < xen_evtchn_max_channels(); port++) { |
Olaf Hering | 62cc5fc | 2011-08-25 18:30:48 +0200 | [diff] [blame] | 973 | status.dom = DOMID_SELF; |
| 974 | status.port = port; |
| 975 | rc = HYPERVISOR_event_channel_op(EVTCHNOP_status, &status); |
| 976 | if (rc < 0) |
| 977 | continue; |
| 978 | if (status.status != EVTCHNSTAT_virq) |
| 979 | continue; |
Vitaly Kuznetsov | b36585a | 2016-11-23 13:38:45 +0100 | [diff] [blame] | 980 | if (status.u.virq == virq && status.vcpu == xen_vcpu_nr(cpu)) { |
Olaf Hering | 62cc5fc | 2011-08-25 18:30:48 +0200 | [diff] [blame] | 981 | rc = port; |
| 982 | break; |
| 983 | } |
| 984 | } |
| 985 | return rc; |
| 986 | } |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 987 | |
David Vrabel | 0dc0064 | 2013-09-23 21:03:38 +0100 | [diff] [blame] | 988 | /** |
| 989 | * xen_evtchn_nr_channels - number of usable event channel ports |
| 990 | * |
| 991 | * This may be less than the maximum supported by the current |
| 992 | * hypervisor ABI. Use xen_evtchn_max_channels() for the maximum |
| 993 | * supported. |
| 994 | */ |
| 995 | unsigned xen_evtchn_nr_channels(void) |
| 996 | { |
| 997 | return evtchn_ops->nr_channels(); |
| 998 | } |
| 999 | EXPORT_SYMBOL_GPL(xen_evtchn_nr_channels); |
| 1000 | |
David Vrabel | 77bb3df | 2015-05-19 18:40:49 +0100 | [diff] [blame] | 1001 | int bind_virq_to_irq(unsigned int virq, unsigned int cpu, bool percpu) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1002 | { |
| 1003 | struct evtchn_bind_virq bind_virq; |
Olaf Hering | 62cc5fc | 2011-08-25 18:30:48 +0200 | [diff] [blame] | 1004 | int evtchn, irq, ret; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1005 | |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 1006 | mutex_lock(&irq_mapping_update_lock); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1007 | |
| 1008 | irq = per_cpu(virq_to_irq, cpu)[virq]; |
| 1009 | |
| 1010 | if (irq == -1) { |
Ian Campbell | c9df1ce | 2011-01-11 17:20:15 +0000 | [diff] [blame] | 1011 | irq = xen_allocate_irq_dynamic(); |
Wei Liu | 68ba45f | 2013-01-31 14:46:56 +0000 | [diff] [blame] | 1012 | if (irq < 0) |
Ian Campbell | 7bee976 | 2011-03-10 16:08:15 +0000 | [diff] [blame] | 1013 | goto out; |
Jeremy Fitzhardinge | a52521f | 2010-09-22 15:28:52 -0700 | [diff] [blame] | 1014 | |
David Vrabel | 77bb3df | 2015-05-19 18:40:49 +0100 | [diff] [blame] | 1015 | if (percpu) |
| 1016 | irq_set_chip_and_handler_name(irq, &xen_percpu_chip, |
| 1017 | handle_percpu_irq, "virq"); |
| 1018 | else |
| 1019 | irq_set_chip_and_handler_name(irq, &xen_dynamic_chip, |
| 1020 | handle_edge_irq, "virq"); |
Jeremy Fitzhardinge | a52521f | 2010-09-22 15:28:52 -0700 | [diff] [blame] | 1021 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1022 | bind_virq.virq = virq; |
Vitaly Kuznetsov | 8058c0b | 2016-06-30 17:56:40 +0200 | [diff] [blame] | 1023 | bind_virq.vcpu = xen_vcpu_nr(cpu); |
Olaf Hering | 62cc5fc | 2011-08-25 18:30:48 +0200 | [diff] [blame] | 1024 | ret = HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq, |
| 1025 | &bind_virq); |
| 1026 | if (ret == 0) |
| 1027 | evtchn = bind_virq.port; |
| 1028 | else { |
| 1029 | if (ret == -EEXIST) |
| 1030 | ret = find_virq(virq, cpu); |
| 1031 | BUG_ON(ret < 0); |
| 1032 | evtchn = ret; |
| 1033 | } |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1034 | |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 1035 | ret = xen_irq_info_virq_setup(cpu, irq, evtchn, virq); |
| 1036 | if (ret < 0) { |
| 1037 | __unbind_from_irq(irq); |
| 1038 | irq = ret; |
| 1039 | goto out; |
| 1040 | } |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1041 | |
| 1042 | bind_evtchn_to_cpu(evtchn, cpu); |
Konrad Rzeszutek Wilk | 5e152e6 | 2012-05-23 13:28:44 -0400 | [diff] [blame] | 1043 | } else { |
| 1044 | struct irq_info *info = info_for_irq(irq); |
| 1045 | WARN_ON(info == NULL || info->type != IRQT_VIRQ); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1046 | } |
| 1047 | |
Ian Campbell | 7bee976 | 2011-03-10 16:08:15 +0000 | [diff] [blame] | 1048 | out: |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 1049 | mutex_unlock(&irq_mapping_update_lock); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1050 | |
| 1051 | return irq; |
| 1052 | } |
| 1053 | |
| 1054 | static void unbind_from_irq(unsigned int irq) |
| 1055 | { |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 1056 | mutex_lock(&irq_mapping_update_lock); |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 1057 | __unbind_from_irq(irq); |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 1058 | mutex_unlock(&irq_mapping_update_lock); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1059 | } |
| 1060 | |
| 1061 | int bind_evtchn_to_irqhandler(unsigned int evtchn, |
Jeff Garzik | 7c23997 | 2007-10-19 03:12:20 -0400 | [diff] [blame] | 1062 | irq_handler_t handler, |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1063 | unsigned long irqflags, |
| 1064 | const char *devname, void *dev_id) |
| 1065 | { |
Nicolas Kaiser | 361ae8c | 2011-03-30 21:14:26 +0200 | [diff] [blame] | 1066 | int irq, retval; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1067 | |
| 1068 | irq = bind_evtchn_to_irq(evtchn); |
Ian Campbell | 7bee976 | 2011-03-10 16:08:15 +0000 | [diff] [blame] | 1069 | if (irq < 0) |
| 1070 | return irq; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1071 | retval = request_irq(irq, handler, irqflags, devname, dev_id); |
| 1072 | if (retval != 0) { |
| 1073 | unbind_from_irq(irq); |
| 1074 | return retval; |
| 1075 | } |
| 1076 | |
| 1077 | return irq; |
| 1078 | } |
| 1079 | EXPORT_SYMBOL_GPL(bind_evtchn_to_irqhandler); |
| 1080 | |
Ian Campbell | 2e820f5 | 2009-02-09 12:05:50 -0800 | [diff] [blame] | 1081 | int bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain, |
| 1082 | unsigned int remote_port, |
| 1083 | irq_handler_t handler, |
| 1084 | unsigned long irqflags, |
| 1085 | const char *devname, |
| 1086 | void *dev_id) |
| 1087 | { |
| 1088 | int irq, retval; |
| 1089 | |
| 1090 | irq = bind_interdomain_evtchn_to_irq(remote_domain, remote_port); |
| 1091 | if (irq < 0) |
| 1092 | return irq; |
| 1093 | |
| 1094 | retval = request_irq(irq, handler, irqflags, devname, dev_id); |
| 1095 | if (retval != 0) { |
| 1096 | unbind_from_irq(irq); |
| 1097 | return retval; |
| 1098 | } |
| 1099 | |
| 1100 | return irq; |
| 1101 | } |
| 1102 | EXPORT_SYMBOL_GPL(bind_interdomain_evtchn_to_irqhandler); |
| 1103 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1104 | int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu, |
Jeff Garzik | 7c23997 | 2007-10-19 03:12:20 -0400 | [diff] [blame] | 1105 | irq_handler_t handler, |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1106 | unsigned long irqflags, const char *devname, void *dev_id) |
| 1107 | { |
Nicolas Kaiser | 361ae8c | 2011-03-30 21:14:26 +0200 | [diff] [blame] | 1108 | int irq, retval; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1109 | |
David Vrabel | 77bb3df | 2015-05-19 18:40:49 +0100 | [diff] [blame] | 1110 | irq = bind_virq_to_irq(virq, cpu, irqflags & IRQF_PERCPU); |
Ian Campbell | 7bee976 | 2011-03-10 16:08:15 +0000 | [diff] [blame] | 1111 | if (irq < 0) |
| 1112 | return irq; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1113 | retval = request_irq(irq, handler, irqflags, devname, dev_id); |
| 1114 | if (retval != 0) { |
| 1115 | unbind_from_irq(irq); |
| 1116 | return retval; |
| 1117 | } |
| 1118 | |
| 1119 | return irq; |
| 1120 | } |
| 1121 | EXPORT_SYMBOL_GPL(bind_virq_to_irqhandler); |
| 1122 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1123 | int bind_ipi_to_irqhandler(enum ipi_vector ipi, |
| 1124 | unsigned int cpu, |
| 1125 | irq_handler_t handler, |
| 1126 | unsigned long irqflags, |
| 1127 | const char *devname, |
| 1128 | void *dev_id) |
| 1129 | { |
| 1130 | int irq, retval; |
| 1131 | |
| 1132 | irq = bind_ipi_to_irq(ipi, cpu); |
| 1133 | if (irq < 0) |
| 1134 | return irq; |
| 1135 | |
Ian Campbell | 9bab0b7 | 2011-10-03 15:37:00 +0100 | [diff] [blame] | 1136 | irqflags |= IRQF_NO_SUSPEND | IRQF_FORCE_RESUME | IRQF_EARLY_RESUME; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1137 | retval = request_irq(irq, handler, irqflags, devname, dev_id); |
| 1138 | if (retval != 0) { |
| 1139 | unbind_from_irq(irq); |
| 1140 | return retval; |
| 1141 | } |
| 1142 | |
| 1143 | return irq; |
| 1144 | } |
| 1145 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1146 | void unbind_from_irqhandler(unsigned int irq, void *dev_id) |
| 1147 | { |
Juergen Gross | 82856cd | 2020-09-30 11:16:14 +0200 | [diff] [blame] | 1148 | struct irq_info *info = info_for_irq(irq); |
Konrad Rzeszutek Wilk | 94032c5 | 2013-04-16 10:55:18 -0400 | [diff] [blame] | 1149 | |
| 1150 | if (WARN_ON(!info)) |
| 1151 | return; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1152 | free_irq(irq, dev_id); |
| 1153 | unbind_from_irq(irq); |
| 1154 | } |
| 1155 | EXPORT_SYMBOL_GPL(unbind_from_irqhandler); |
| 1156 | |
David Vrabel | 6ccecb0 | 2013-09-23 12:47:26 +0100 | [diff] [blame] | 1157 | /** |
| 1158 | * xen_set_irq_priority() - set an event channel priority. |
| 1159 | * @irq:irq bound to an event channel. |
| 1160 | * @priority: priority between XEN_IRQ_PRIORITY_MAX and XEN_IRQ_PRIORITY_MIN. |
| 1161 | */ |
| 1162 | int xen_set_irq_priority(unsigned irq, unsigned priority) |
| 1163 | { |
| 1164 | struct evtchn_set_priority set_priority; |
| 1165 | |
| 1166 | set_priority.port = evtchn_from_irq(irq); |
| 1167 | set_priority.priority = priority; |
| 1168 | |
| 1169 | return HYPERVISOR_event_channel_op(EVTCHNOP_set_priority, |
| 1170 | &set_priority); |
| 1171 | } |
| 1172 | EXPORT_SYMBOL_GPL(xen_set_irq_priority); |
| 1173 | |
Daniel De Graaf | 420eb55 | 2011-10-27 17:58:47 -0400 | [diff] [blame] | 1174 | int evtchn_make_refcounted(unsigned int evtchn) |
| 1175 | { |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 1176 | int irq = get_evtchn_to_irq(evtchn); |
Daniel De Graaf | 420eb55 | 2011-10-27 17:58:47 -0400 | [diff] [blame] | 1177 | struct irq_info *info; |
| 1178 | |
| 1179 | if (irq == -1) |
| 1180 | return -ENOENT; |
| 1181 | |
Juergen Gross | 82856cd | 2020-09-30 11:16:14 +0200 | [diff] [blame] | 1182 | info = info_for_irq(irq); |
Daniel De Graaf | 420eb55 | 2011-10-27 17:58:47 -0400 | [diff] [blame] | 1183 | |
| 1184 | if (!info) |
| 1185 | return -ENOENT; |
| 1186 | |
| 1187 | WARN_ON(info->refcnt != -1); |
| 1188 | |
| 1189 | info->refcnt = 1; |
| 1190 | |
| 1191 | return 0; |
| 1192 | } |
| 1193 | EXPORT_SYMBOL_GPL(evtchn_make_refcounted); |
| 1194 | |
| 1195 | int evtchn_get(unsigned int evtchn) |
| 1196 | { |
| 1197 | int irq; |
| 1198 | struct irq_info *info; |
| 1199 | int err = -ENOENT; |
| 1200 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 1201 | if (evtchn >= xen_evtchn_max_channels()) |
Daniel De Graaf | c3b3f16 | 2011-11-28 11:49:09 -0500 | [diff] [blame] | 1202 | return -EINVAL; |
| 1203 | |
Daniel De Graaf | 420eb55 | 2011-10-27 17:58:47 -0400 | [diff] [blame] | 1204 | mutex_lock(&irq_mapping_update_lock); |
| 1205 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 1206 | irq = get_evtchn_to_irq(evtchn); |
Daniel De Graaf | 420eb55 | 2011-10-27 17:58:47 -0400 | [diff] [blame] | 1207 | if (irq == -1) |
| 1208 | goto done; |
| 1209 | |
Juergen Gross | 82856cd | 2020-09-30 11:16:14 +0200 | [diff] [blame] | 1210 | info = info_for_irq(irq); |
Daniel De Graaf | 420eb55 | 2011-10-27 17:58:47 -0400 | [diff] [blame] | 1211 | |
| 1212 | if (!info) |
| 1213 | goto done; |
| 1214 | |
| 1215 | err = -EINVAL; |
| 1216 | if (info->refcnt <= 0) |
| 1217 | goto done; |
| 1218 | |
| 1219 | info->refcnt++; |
| 1220 | err = 0; |
| 1221 | done: |
| 1222 | mutex_unlock(&irq_mapping_update_lock); |
| 1223 | |
| 1224 | return err; |
| 1225 | } |
| 1226 | EXPORT_SYMBOL_GPL(evtchn_get); |
| 1227 | |
| 1228 | void evtchn_put(unsigned int evtchn) |
| 1229 | { |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 1230 | int irq = get_evtchn_to_irq(evtchn); |
Daniel De Graaf | 420eb55 | 2011-10-27 17:58:47 -0400 | [diff] [blame] | 1231 | if (WARN_ON(irq == -1)) |
| 1232 | return; |
| 1233 | unbind_from_irq(irq); |
| 1234 | } |
| 1235 | EXPORT_SYMBOL_GPL(evtchn_put); |
| 1236 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1237 | void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector) |
| 1238 | { |
Konrad Rzeszutek Wilk | 6efa20e | 2013-07-19 11:51:31 -0400 | [diff] [blame] | 1239 | int irq; |
| 1240 | |
Stefano Stabellini | 072b206 | 2013-08-13 16:57:06 +0000 | [diff] [blame] | 1241 | #ifdef CONFIG_X86 |
Konrad Rzeszutek Wilk | 6efa20e | 2013-07-19 11:51:31 -0400 | [diff] [blame] | 1242 | if (unlikely(vector == XEN_NMI_VECTOR)) { |
Vitaly Kuznetsov | ad5475f | 2016-06-30 17:56:38 +0200 | [diff] [blame] | 1243 | int rc = HYPERVISOR_vcpu_op(VCPUOP_send_nmi, xen_vcpu_nr(cpu), |
| 1244 | NULL); |
Konrad Rzeszutek Wilk | 6efa20e | 2013-07-19 11:51:31 -0400 | [diff] [blame] | 1245 | if (rc < 0) |
| 1246 | printk(KERN_WARNING "Sending nmi to CPU%d failed (rc:%d)\n", cpu, rc); |
| 1247 | return; |
| 1248 | } |
Stefano Stabellini | 072b206 | 2013-08-13 16:57:06 +0000 | [diff] [blame] | 1249 | #endif |
Konrad Rzeszutek Wilk | 6efa20e | 2013-07-19 11:51:31 -0400 | [diff] [blame] | 1250 | irq = per_cpu(ipi_to_irq, cpu)[vector]; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1251 | BUG_ON(irq < 0); |
| 1252 | notify_remote_via_irq(irq); |
| 1253 | } |
| 1254 | |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 1255 | static DEFINE_PER_CPU(unsigned, xed_nesting_count); |
| 1256 | |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1257 | static void __xen_evtchn_do_upcall(void) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1258 | { |
Christoph Lameter | 780f36d | 2010-12-06 11:16:29 -0600 | [diff] [blame] | 1259 | struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu); |
David Vrabel | 9a489f4 | 2013-03-13 15:29:25 +0000 | [diff] [blame] | 1260 | int cpu = get_cpu(); |
Ruslan Pisarev | 088c05a | 2011-07-26 14:16:13 +0300 | [diff] [blame] | 1261 | unsigned count; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1262 | |
Juergen Gross | 61d359d | 2020-09-07 15:47:27 +0200 | [diff] [blame^] | 1263 | read_lock(&evtchn_rwlock); |
| 1264 | |
Jeremy Fitzhardinge | 229664b | 2008-03-17 16:37:20 -0700 | [diff] [blame] | 1265 | do { |
Jeremy Fitzhardinge | 229664b | 2008-03-17 16:37:20 -0700 | [diff] [blame] | 1266 | vcpu_info->evtchn_upcall_pending = 0; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1267 | |
Christoph Lameter | b2e4ae6 | 2010-12-06 11:40:07 -0600 | [diff] [blame] | 1268 | if (__this_cpu_inc_return(xed_nesting_count) - 1) |
Jeremy Fitzhardinge | 229664b | 2008-03-17 16:37:20 -0700 | [diff] [blame] | 1269 | goto out; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1270 | |
David Vrabel | 9a489f4 | 2013-03-13 15:29:25 +0000 | [diff] [blame] | 1271 | xen_evtchn_handle_events(cpu); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1272 | |
Jeremy Fitzhardinge | 229664b | 2008-03-17 16:37:20 -0700 | [diff] [blame] | 1273 | BUG_ON(!irqs_disabled()); |
| 1274 | |
Christoph Lameter | 780f36d | 2010-12-06 11:16:29 -0600 | [diff] [blame] | 1275 | count = __this_cpu_read(xed_nesting_count); |
| 1276 | __this_cpu_write(xed_nesting_count, 0); |
Stefano Stabellini | 183d03c | 2010-05-17 17:08:21 +0100 | [diff] [blame] | 1277 | } while (count != 1 || vcpu_info->evtchn_upcall_pending); |
Jeremy Fitzhardinge | 229664b | 2008-03-17 16:37:20 -0700 | [diff] [blame] | 1278 | |
| 1279 | out: |
Juergen Gross | 61d359d | 2020-09-07 15:47:27 +0200 | [diff] [blame^] | 1280 | read_unlock(&evtchn_rwlock); |
Jeremy Fitzhardinge | 3445a8f | 2009-02-06 14:09:46 -0800 | [diff] [blame] | 1281 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1282 | put_cpu(); |
| 1283 | } |
| 1284 | |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1285 | void xen_evtchn_do_upcall(struct pt_regs *regs) |
| 1286 | { |
| 1287 | struct pt_regs *old_regs = set_irq_regs(regs); |
| 1288 | |
Mojiong Qiu | 772aebc | 2012-11-06 16:08:15 +0800 | [diff] [blame] | 1289 | irq_enter(); |
Stefano Stabellini | 0ec53ec | 2012-09-14 13:37:32 +0000 | [diff] [blame] | 1290 | #ifdef CONFIG_X86 |
Thomas Gleixner | 99c8b79 | 2014-02-23 21:40:21 +0000 | [diff] [blame] | 1291 | inc_irq_stat(irq_hv_callback_count); |
Arnd Bergmann | d06eb3e | 2014-03-25 16:52:25 +0100 | [diff] [blame] | 1292 | #endif |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1293 | |
| 1294 | __xen_evtchn_do_upcall(); |
| 1295 | |
| 1296 | irq_exit(); |
| 1297 | set_irq_regs(old_regs); |
| 1298 | } |
| 1299 | |
| 1300 | void xen_hvm_evtchn_do_upcall(void) |
| 1301 | { |
| 1302 | __xen_evtchn_do_upcall(); |
| 1303 | } |
Stefano Stabellini | 183d03c | 2010-05-17 17:08:21 +0100 | [diff] [blame] | 1304 | EXPORT_SYMBOL_GPL(xen_hvm_evtchn_do_upcall); |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1305 | |
Jeremy Fitzhardinge | eb1e305 | 2008-05-26 23:31:23 +0100 | [diff] [blame] | 1306 | /* Rebind a new event channel to an existing irq. */ |
| 1307 | void rebind_evtchn_irq(int evtchn, int irq) |
| 1308 | { |
Jeremy Fitzhardinge | d77bbd4 | 2009-02-06 14:09:45 -0800 | [diff] [blame] | 1309 | struct irq_info *info = info_for_irq(irq); |
| 1310 | |
Konrad Rzeszutek Wilk | 94032c5 | 2013-04-16 10:55:18 -0400 | [diff] [blame] | 1311 | if (WARN_ON(!info)) |
| 1312 | return; |
| 1313 | |
Jeremy Fitzhardinge | eb1e305 | 2008-05-26 23:31:23 +0100 | [diff] [blame] | 1314 | /* Make sure the irq is masked, since the new event channel |
| 1315 | will also be masked. */ |
| 1316 | disable_irq(irq); |
| 1317 | |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 1318 | mutex_lock(&irq_mapping_update_lock); |
Jeremy Fitzhardinge | eb1e305 | 2008-05-26 23:31:23 +0100 | [diff] [blame] | 1319 | |
| 1320 | /* After resume the irq<->evtchn mappings are all cleared out */ |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 1321 | BUG_ON(get_evtchn_to_irq(evtchn) != -1); |
Jeremy Fitzhardinge | eb1e305 | 2008-05-26 23:31:23 +0100 | [diff] [blame] | 1322 | /* Expect irq to have been bound before, |
Jeremy Fitzhardinge | d77bbd4 | 2009-02-06 14:09:45 -0800 | [diff] [blame] | 1323 | so there should be a proper type */ |
| 1324 | BUG_ON(info->type == IRQT_UNBOUND); |
Jeremy Fitzhardinge | eb1e305 | 2008-05-26 23:31:23 +0100 | [diff] [blame] | 1325 | |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 1326 | (void)xen_irq_info_evtchn_setup(irq, evtchn); |
Jeremy Fitzhardinge | eb1e305 | 2008-05-26 23:31:23 +0100 | [diff] [blame] | 1327 | |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 1328 | mutex_unlock(&irq_mapping_update_lock); |
Jeremy Fitzhardinge | eb1e305 | 2008-05-26 23:31:23 +0100 | [diff] [blame] | 1329 | |
Boris Ostrovsky | 5cec988 | 2015-04-29 17:10:12 -0400 | [diff] [blame] | 1330 | bind_evtchn_to_cpu(evtchn, info->cpu); |
| 1331 | /* This will be deferred until interrupt is processed */ |
| 1332 | irq_set_affinity(irq, cpumask_of(info->cpu)); |
Jeremy Fitzhardinge | eb1e305 | 2008-05-26 23:31:23 +0100 | [diff] [blame] | 1333 | |
| 1334 | /* Unmask the event channel. */ |
| 1335 | enable_irq(irq); |
| 1336 | } |
| 1337 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1338 | /* Rebind an evtchn so that it gets delivered to a specific cpu */ |
Juergen Gross | 007e5aa | 2019-06-21 20:47:03 +0200 | [diff] [blame] | 1339 | static int xen_rebind_evtchn_to_cpu(int evtchn, unsigned int tcpu) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1340 | { |
| 1341 | struct evtchn_bind_vcpu bind_vcpu; |
David Vrabel | 4704fe4 | 2013-08-15 13:21:07 +0100 | [diff] [blame] | 1342 | int masked; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1343 | |
Ian Campbell | be49472 | 2011-03-10 16:08:02 +0000 | [diff] [blame] | 1344 | if (!VALID_EVTCHN(evtchn)) |
| 1345 | return -1; |
| 1346 | |
Boris Ostrovsky | 84d582d | 2017-04-24 15:04:53 -0400 | [diff] [blame] | 1347 | if (!xen_support_evtchn_rebind()) |
| 1348 | return -1; |
| 1349 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1350 | /* Send future instances of this interrupt to other vcpu. */ |
| 1351 | bind_vcpu.port = evtchn; |
Vitaly Kuznetsov | 8058c0b | 2016-06-30 17:56:40 +0200 | [diff] [blame] | 1352 | bind_vcpu.vcpu = xen_vcpu_nr(tcpu); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1353 | |
| 1354 | /* |
David Vrabel | 4704fe4 | 2013-08-15 13:21:07 +0100 | [diff] [blame] | 1355 | * Mask the event while changing the VCPU binding to prevent |
| 1356 | * it being delivered on an unexpected VCPU. |
| 1357 | */ |
Wei Liu | 3f70fa8 | 2013-03-07 15:50:27 +0000 | [diff] [blame] | 1358 | masked = test_and_set_mask(evtchn); |
David Vrabel | 4704fe4 | 2013-08-15 13:21:07 +0100 | [diff] [blame] | 1359 | |
| 1360 | /* |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1361 | * If this fails, it usually just indicates that we're dealing with a |
| 1362 | * virq or IPI channel, which don't actually need to be rebound. Ignore |
| 1363 | * it, but don't do the xenlinux-level rebind in that case. |
| 1364 | */ |
| 1365 | if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_vcpu, &bind_vcpu) >= 0) |
| 1366 | bind_evtchn_to_cpu(evtchn, tcpu); |
Yinghai Lu | d5dedd4 | 2009-04-27 17:59:21 -0700 | [diff] [blame] | 1367 | |
David Vrabel | 4704fe4 | 2013-08-15 13:21:07 +0100 | [diff] [blame] | 1368 | if (!masked) |
| 1369 | unmask_evtchn(evtchn); |
| 1370 | |
Yinghai Lu | d5dedd4 | 2009-04-27 17:59:21 -0700 | [diff] [blame] | 1371 | return 0; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1372 | } |
| 1373 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1374 | static int set_affinity_irq(struct irq_data *data, const struct cpumask *dest, |
| 1375 | bool force) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1376 | { |
Thomas Gleixner | 753fbd2 | 2014-03-04 20:43:40 +0000 | [diff] [blame] | 1377 | unsigned tcpu = cpumask_first_and(dest, cpu_online_mask); |
Linus Torvalds | 6e6c5b9 | 2017-07-06 19:11:24 -0700 | [diff] [blame] | 1378 | int ret = xen_rebind_evtchn_to_cpu(evtchn_from_irq(data->irq), tcpu); |
Yinghai Lu | d5dedd4 | 2009-04-27 17:59:21 -0700 | [diff] [blame] | 1379 | |
Thomas Gleixner | ef1c2cc | 2017-06-20 01:37:45 +0200 | [diff] [blame] | 1380 | if (!ret) |
| 1381 | irq_data_update_effective_affinity(data, cpumask_of(tcpu)); |
| 1382 | |
| 1383 | return ret; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1384 | } |
| 1385 | |
Juergen Gross | 007e5aa | 2019-06-21 20:47:03 +0200 | [diff] [blame] | 1386 | /* To be called with desc->lock held. */ |
| 1387 | int xen_set_affinity_evtchn(struct irq_desc *desc, unsigned int tcpu) |
| 1388 | { |
| 1389 | struct irq_data *d = irq_desc_get_irq_data(desc); |
| 1390 | |
| 1391 | return set_affinity_irq(d, cpumask_of(tcpu), false); |
| 1392 | } |
| 1393 | EXPORT_SYMBOL_GPL(xen_set_affinity_evtchn); |
| 1394 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1395 | static void enable_dynirq(struct irq_data *data) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1396 | { |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1397 | int evtchn = evtchn_from_irq(data->irq); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1398 | |
| 1399 | if (VALID_EVTCHN(evtchn)) |
| 1400 | unmask_evtchn(evtchn); |
| 1401 | } |
| 1402 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1403 | static void disable_dynirq(struct irq_data *data) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1404 | { |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1405 | int evtchn = evtchn_from_irq(data->irq); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1406 | |
| 1407 | if (VALID_EVTCHN(evtchn)) |
| 1408 | mask_evtchn(evtchn); |
| 1409 | } |
| 1410 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1411 | static void ack_dynirq(struct irq_data *data) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1412 | { |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1413 | int evtchn = evtchn_from_irq(data->irq); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1414 | |
Boris Ostrovsky | ff1e22e | 2016-03-18 10:11:07 -0400 | [diff] [blame] | 1415 | if (!VALID_EVTCHN(evtchn)) |
| 1416 | return; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1417 | |
Ross Lagerwall | f0f3938 | 2016-05-10 16:11:00 +0100 | [diff] [blame] | 1418 | if (unlikely(irqd_is_setaffinity_pending(data)) && |
| 1419 | likely(!irqd_irq_disabled(data))) { |
Boris Ostrovsky | ff1e22e | 2016-03-18 10:11:07 -0400 | [diff] [blame] | 1420 | int masked = test_and_set_mask(evtchn); |
| 1421 | |
| 1422 | clear_evtchn(evtchn); |
| 1423 | |
| 1424 | irq_move_masked_irq(data); |
| 1425 | |
| 1426 | if (!masked) |
| 1427 | unmask_evtchn(evtchn); |
| 1428 | } else |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 1429 | clear_evtchn(evtchn); |
| 1430 | } |
| 1431 | |
| 1432 | static void mask_ack_dynirq(struct irq_data *data) |
| 1433 | { |
| 1434 | disable_dynirq(data); |
| 1435 | ack_dynirq(data); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1436 | } |
| 1437 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1438 | static int retrigger_dynirq(struct irq_data *data) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1439 | { |
David Vrabel | 4640ddf | 2014-02-17 17:45:16 +0000 | [diff] [blame] | 1440 | unsigned int evtchn = evtchn_from_irq(data->irq); |
| 1441 | int masked; |
| 1442 | |
| 1443 | if (!VALID_EVTCHN(evtchn)) |
| 1444 | return 0; |
| 1445 | |
| 1446 | masked = test_and_set_mask(evtchn); |
| 1447 | set_evtchn(evtchn); |
| 1448 | if (!masked) |
| 1449 | unmask_evtchn(evtchn); |
| 1450 | |
| 1451 | return 1; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1452 | } |
| 1453 | |
Ian Campbell | 0a85226 | 2011-03-10 16:08:06 +0000 | [diff] [blame] | 1454 | static void restore_pirqs(void) |
Stefano Stabellini | 9a069c3 | 2010-12-01 14:51:44 +0000 | [diff] [blame] | 1455 | { |
| 1456 | int pirq, rc, irq, gsi; |
| 1457 | struct physdev_map_pirq map_irq; |
Ian Campbell | 69c358c | 2011-03-10 16:08:13 +0000 | [diff] [blame] | 1458 | struct irq_info *info; |
Stefano Stabellini | 9a069c3 | 2010-12-01 14:51:44 +0000 | [diff] [blame] | 1459 | |
Ian Campbell | 69c358c | 2011-03-10 16:08:13 +0000 | [diff] [blame] | 1460 | list_for_each_entry(info, &xen_irq_list_head, list) { |
| 1461 | if (info->type != IRQT_PIRQ) |
Stefano Stabellini | 9a069c3 | 2010-12-01 14:51:44 +0000 | [diff] [blame] | 1462 | continue; |
| 1463 | |
Ian Campbell | 69c358c | 2011-03-10 16:08:13 +0000 | [diff] [blame] | 1464 | pirq = info->u.pirq.pirq; |
| 1465 | gsi = info->u.pirq.gsi; |
| 1466 | irq = info->irq; |
| 1467 | |
Stefano Stabellini | 9a069c3 | 2010-12-01 14:51:44 +0000 | [diff] [blame] | 1468 | /* save/restore of PT devices doesn't work, so at this point the |
| 1469 | * only devices present are GSI based emulated devices */ |
Stefano Stabellini | 9a069c3 | 2010-12-01 14:51:44 +0000 | [diff] [blame] | 1470 | if (!gsi) |
| 1471 | continue; |
| 1472 | |
| 1473 | map_irq.domid = DOMID_SELF; |
| 1474 | map_irq.type = MAP_PIRQ_TYPE_GSI; |
| 1475 | map_irq.index = gsi; |
| 1476 | map_irq.pirq = pirq; |
| 1477 | |
| 1478 | rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq); |
| 1479 | if (rc) { |
Joe Perches | 283c097 | 2013-06-28 03:21:41 -0700 | [diff] [blame] | 1480 | pr_warn("xen map irq failed gsi=%d irq=%d pirq=%d rc=%d\n", |
| 1481 | gsi, irq, pirq, rc); |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 1482 | xen_free_irq(irq); |
Stefano Stabellini | 9a069c3 | 2010-12-01 14:51:44 +0000 | [diff] [blame] | 1483 | continue; |
| 1484 | } |
| 1485 | |
| 1486 | printk(KERN_DEBUG "xen: --> irq=%d, pirq=%d\n", irq, map_irq.pirq); |
| 1487 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1488 | __startup_pirq(irq); |
Stefano Stabellini | 9a069c3 | 2010-12-01 14:51:44 +0000 | [diff] [blame] | 1489 | } |
| 1490 | } |
| 1491 | |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1492 | static void restore_cpu_virqs(unsigned int cpu) |
| 1493 | { |
| 1494 | struct evtchn_bind_virq bind_virq; |
| 1495 | int virq, irq, evtchn; |
| 1496 | |
| 1497 | for (virq = 0; virq < NR_VIRQS; virq++) { |
| 1498 | if ((irq = per_cpu(virq_to_irq, cpu)[virq]) == -1) |
| 1499 | continue; |
| 1500 | |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 1501 | BUG_ON(virq_from_irq(irq) != virq); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1502 | |
| 1503 | /* Get a new binding from Xen. */ |
| 1504 | bind_virq.virq = virq; |
Vitaly Kuznetsov | 8058c0b | 2016-06-30 17:56:40 +0200 | [diff] [blame] | 1505 | bind_virq.vcpu = xen_vcpu_nr(cpu); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1506 | if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq, |
| 1507 | &bind_virq) != 0) |
| 1508 | BUG(); |
| 1509 | evtchn = bind_virq.port; |
| 1510 | |
| 1511 | /* Record the new mapping. */ |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 1512 | (void)xen_irq_info_virq_setup(cpu, irq, evtchn, virq); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1513 | bind_evtchn_to_cpu(evtchn, cpu); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1514 | } |
| 1515 | } |
| 1516 | |
| 1517 | static void restore_cpu_ipis(unsigned int cpu) |
| 1518 | { |
| 1519 | struct evtchn_bind_ipi bind_ipi; |
| 1520 | int ipi, irq, evtchn; |
| 1521 | |
| 1522 | for (ipi = 0; ipi < XEN_NR_IPIS; ipi++) { |
| 1523 | if ((irq = per_cpu(ipi_to_irq, cpu)[ipi]) == -1) |
| 1524 | continue; |
| 1525 | |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 1526 | BUG_ON(ipi_from_irq(irq) != ipi); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1527 | |
| 1528 | /* Get a new binding from Xen. */ |
Vitaly Kuznetsov | 8058c0b | 2016-06-30 17:56:40 +0200 | [diff] [blame] | 1529 | bind_ipi.vcpu = xen_vcpu_nr(cpu); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1530 | if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi, |
| 1531 | &bind_ipi) != 0) |
| 1532 | BUG(); |
| 1533 | evtchn = bind_ipi.port; |
| 1534 | |
| 1535 | /* Record the new mapping. */ |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 1536 | (void)xen_irq_info_ipi_setup(cpu, irq, evtchn, ipi); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1537 | bind_evtchn_to_cpu(evtchn, cpu); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1538 | } |
| 1539 | } |
| 1540 | |
Jeremy Fitzhardinge | 2d9e1e2 | 2008-07-07 12:07:53 -0700 | [diff] [blame] | 1541 | /* Clear an irq's pending state, in preparation for polling on it */ |
| 1542 | void xen_clear_irq_pending(int irq) |
| 1543 | { |
| 1544 | int evtchn = evtchn_from_irq(irq); |
| 1545 | |
| 1546 | if (VALID_EVTCHN(evtchn)) |
| 1547 | clear_evtchn(evtchn); |
| 1548 | } |
Konrad Rzeszutek Wilk | d9a8814 | 2009-11-05 16:33:09 -0500 | [diff] [blame] | 1549 | EXPORT_SYMBOL(xen_clear_irq_pending); |
Jeremy Fitzhardinge | 168d2f4 | 2008-08-20 17:02:18 -0700 | [diff] [blame] | 1550 | void xen_set_irq_pending(int irq) |
| 1551 | { |
| 1552 | int evtchn = evtchn_from_irq(irq); |
| 1553 | |
| 1554 | if (VALID_EVTCHN(evtchn)) |
| 1555 | set_evtchn(evtchn); |
| 1556 | } |
| 1557 | |
| 1558 | bool xen_test_irq_pending(int irq) |
| 1559 | { |
| 1560 | int evtchn = evtchn_from_irq(irq); |
| 1561 | bool ret = false; |
| 1562 | |
| 1563 | if (VALID_EVTCHN(evtchn)) |
| 1564 | ret = test_evtchn(evtchn); |
| 1565 | |
| 1566 | return ret; |
| 1567 | } |
| 1568 | |
Konrad Rzeszutek Wilk | d9a8814 | 2009-11-05 16:33:09 -0500 | [diff] [blame] | 1569 | /* Poll waiting for an irq to become pending with timeout. In the usual case, |
| 1570 | * the irq will be disabled so it won't deliver an interrupt. */ |
| 1571 | void xen_poll_irq_timeout(int irq, u64 timeout) |
Jeremy Fitzhardinge | 2d9e1e2 | 2008-07-07 12:07:53 -0700 | [diff] [blame] | 1572 | { |
| 1573 | evtchn_port_t evtchn = evtchn_from_irq(irq); |
| 1574 | |
| 1575 | if (VALID_EVTCHN(evtchn)) { |
| 1576 | struct sched_poll poll; |
| 1577 | |
| 1578 | poll.nr_ports = 1; |
Konrad Rzeszutek Wilk | d9a8814 | 2009-11-05 16:33:09 -0500 | [diff] [blame] | 1579 | poll.timeout = timeout; |
Isaku Yamahata | ff3c536 | 2008-10-14 17:50:44 -0700 | [diff] [blame] | 1580 | set_xen_guest_handle(poll.ports, &evtchn); |
Jeremy Fitzhardinge | 2d9e1e2 | 2008-07-07 12:07:53 -0700 | [diff] [blame] | 1581 | |
| 1582 | if (HYPERVISOR_sched_op(SCHEDOP_poll, &poll) != 0) |
| 1583 | BUG(); |
| 1584 | } |
| 1585 | } |
Konrad Rzeszutek Wilk | d9a8814 | 2009-11-05 16:33:09 -0500 | [diff] [blame] | 1586 | EXPORT_SYMBOL(xen_poll_irq_timeout); |
| 1587 | /* Poll waiting for an irq to become pending. In the usual case, the |
| 1588 | * irq will be disabled so it won't deliver an interrupt. */ |
| 1589 | void xen_poll_irq(int irq) |
| 1590 | { |
| 1591 | xen_poll_irq_timeout(irq, 0 /* no timeout */); |
| 1592 | } |
Jeremy Fitzhardinge | 2d9e1e2 | 2008-07-07 12:07:53 -0700 | [diff] [blame] | 1593 | |
Konrad Rzeszutek Wilk | c7c2c3a | 2010-11-08 14:26:36 -0500 | [diff] [blame] | 1594 | /* Check whether the IRQ line is shared with other guests. */ |
| 1595 | int xen_test_irq_shared(int irq) |
| 1596 | { |
| 1597 | struct irq_info *info = info_for_irq(irq); |
Konrad Rzeszutek Wilk | 94032c5 | 2013-04-16 10:55:18 -0400 | [diff] [blame] | 1598 | struct physdev_irq_status_query irq_status; |
| 1599 | |
| 1600 | if (WARN_ON(!info)) |
| 1601 | return -ENOENT; |
| 1602 | |
| 1603 | irq_status.irq = info->u.pirq.pirq; |
Konrad Rzeszutek Wilk | c7c2c3a | 2010-11-08 14:26:36 -0500 | [diff] [blame] | 1604 | |
| 1605 | if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status)) |
| 1606 | return 0; |
| 1607 | return !(irq_status.flags & XENIRQSTAT_shared); |
| 1608 | } |
| 1609 | EXPORT_SYMBOL_GPL(xen_test_irq_shared); |
| 1610 | |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1611 | void xen_irq_resume(void) |
| 1612 | { |
David Vrabel | fd21069 | 2013-09-05 18:11:38 +0100 | [diff] [blame] | 1613 | unsigned int cpu; |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 1614 | struct irq_info *info; |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1615 | |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1616 | /* New event-channel space is not 'live' yet. */ |
David Vrabel | 1fe5655 | 2013-03-15 13:02:35 +0000 | [diff] [blame] | 1617 | xen_evtchn_resume(); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1618 | |
| 1619 | /* No IRQ <-> event-channel mappings. */ |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 1620 | list_for_each_entry(info, &xen_irq_list_head, list) |
| 1621 | info->evtchn = 0; /* zap event-channel binding */ |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1622 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 1623 | clear_evtchn_to_irq_all(); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1624 | |
| 1625 | for_each_possible_cpu(cpu) { |
| 1626 | restore_cpu_virqs(cpu); |
| 1627 | restore_cpu_ipis(cpu); |
| 1628 | } |
Ian Campbell | 6903591 | 2010-11-01 16:30:09 +0000 | [diff] [blame] | 1629 | |
Ian Campbell | 0a85226 | 2011-03-10 16:08:06 +0000 | [diff] [blame] | 1630 | restore_pirqs(); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1631 | } |
| 1632 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1633 | static struct irq_chip xen_dynamic_chip __read_mostly = { |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1634 | .name = "xen-dyn", |
Jeremy Fitzhardinge | 54a353a | 2009-02-06 14:09:42 -0800 | [diff] [blame] | 1635 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1636 | .irq_disable = disable_dynirq, |
| 1637 | .irq_mask = disable_dynirq, |
| 1638 | .irq_unmask = enable_dynirq, |
Jeremy Fitzhardinge | 54a353a | 2009-02-06 14:09:42 -0800 | [diff] [blame] | 1639 | |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 1640 | .irq_ack = ack_dynirq, |
| 1641 | .irq_mask_ack = mask_ack_dynirq, |
| 1642 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1643 | .irq_set_affinity = set_affinity_irq, |
| 1644 | .irq_retrigger = retrigger_dynirq, |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1645 | }; |
| 1646 | |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 1647 | static struct irq_chip xen_pirq_chip __read_mostly = { |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1648 | .name = "xen-pirq", |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 1649 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1650 | .irq_startup = startup_pirq, |
| 1651 | .irq_shutdown = shutdown_pirq, |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1652 | .irq_enable = enable_pirq, |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1653 | .irq_disable = disable_pirq, |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 1654 | |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 1655 | .irq_mask = disable_dynirq, |
| 1656 | .irq_unmask = enable_dynirq, |
| 1657 | |
| 1658 | .irq_ack = eoi_pirq, |
| 1659 | .irq_eoi = eoi_pirq, |
| 1660 | .irq_mask_ack = mask_ack_pirq, |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 1661 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1662 | .irq_set_affinity = set_affinity_irq, |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 1663 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1664 | .irq_retrigger = retrigger_dynirq, |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 1665 | }; |
| 1666 | |
Jeremy Fitzhardinge | aaca496 | 2010-08-20 18:57:53 -0700 | [diff] [blame] | 1667 | static struct irq_chip xen_percpu_chip __read_mostly = { |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1668 | .name = "xen-percpu", |
Jeremy Fitzhardinge | aaca496 | 2010-08-20 18:57:53 -0700 | [diff] [blame] | 1669 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1670 | .irq_disable = disable_dynirq, |
| 1671 | .irq_mask = disable_dynirq, |
| 1672 | .irq_unmask = enable_dynirq, |
Jeremy Fitzhardinge | aaca496 | 2010-08-20 18:57:53 -0700 | [diff] [blame] | 1673 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1674 | .irq_ack = ack_dynirq, |
Jeremy Fitzhardinge | aaca496 | 2010-08-20 18:57:53 -0700 | [diff] [blame] | 1675 | }; |
| 1676 | |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1677 | int xen_set_callback_via(uint64_t via) |
| 1678 | { |
| 1679 | struct xen_hvm_param a; |
| 1680 | a.domid = DOMID_SELF; |
| 1681 | a.index = HVM_PARAM_CALLBACK_IRQ; |
| 1682 | a.value = via; |
| 1683 | return HYPERVISOR_hvm_op(HVMOP_set_param, &a); |
| 1684 | } |
| 1685 | EXPORT_SYMBOL_GPL(xen_set_callback_via); |
| 1686 | |
Stefano Stabellini | ca65f9f | 2010-07-29 14:37:48 +0100 | [diff] [blame] | 1687 | #ifdef CONFIG_XEN_PVHVM |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1688 | /* Vector callbacks are better than PCI interrupts to receive event |
| 1689 | * channel notifications because we can receive vector callbacks on any |
| 1690 | * vcpu and we don't need PCI support or APIC interactions. */ |
| 1691 | void xen_callback_vector(void) |
| 1692 | { |
| 1693 | int rc; |
| 1694 | uint64_t callback_via; |
KarimAllah Ahmed | 72a9b18 | 2016-08-26 23:55:36 +0200 | [diff] [blame] | 1695 | |
Boris Ostrovsky | 84d582d | 2017-04-24 15:04:53 -0400 | [diff] [blame] | 1696 | if (xen_have_vector_callback) { |
| 1697 | callback_via = HVM_CALLBACK_VECTOR(HYPERVISOR_CALLBACK_VECTOR); |
| 1698 | rc = xen_set_callback_via(callback_via); |
| 1699 | if (rc) { |
| 1700 | pr_err("Request for Xen HVM callback vector failed\n"); |
| 1701 | xen_have_vector_callback = 0; |
| 1702 | return; |
| 1703 | } |
Juergen Gross | 4432362 | 2019-01-14 13:44:13 +0100 | [diff] [blame] | 1704 | pr_info_once("Xen HVM callback vector for event delivery is enabled\n"); |
Thomas Gleixner | 4447ac1 | 2017-08-28 08:47:58 +0200 | [diff] [blame] | 1705 | alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, |
| 1706 | xen_hvm_callback_vector); |
Boris Ostrovsky | 84d582d | 2017-04-24 15:04:53 -0400 | [diff] [blame] | 1707 | } |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1708 | } |
Stefano Stabellini | ca65f9f | 2010-07-29 14:37:48 +0100 | [diff] [blame] | 1709 | #else |
| 1710 | void xen_callback_vector(void) {} |
| 1711 | #endif |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1712 | |
David Vrabel | 1fe5655 | 2013-03-15 13:02:35 +0000 | [diff] [blame] | 1713 | #undef MODULE_PARAM_PREFIX |
| 1714 | #define MODULE_PARAM_PREFIX "xen." |
| 1715 | |
| 1716 | static bool fifo_events = true; |
| 1717 | module_param(fifo_events, bool, 0); |
| 1718 | |
Stefano Stabellini | 2e3d886 | 2012-10-02 15:57:57 +0100 | [diff] [blame] | 1719 | void __init xen_init_IRQ(void) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1720 | { |
David Vrabel | 1fe5655 | 2013-03-15 13:02:35 +0000 | [diff] [blame] | 1721 | int ret = -EINVAL; |
Juergen Gross | e91b2b1 | 2017-07-17 19:47:03 +0200 | [diff] [blame] | 1722 | unsigned int evtchn; |
David Vrabel | 1fe5655 | 2013-03-15 13:02:35 +0000 | [diff] [blame] | 1723 | |
| 1724 | if (fifo_events) |
| 1725 | ret = xen_evtchn_fifo_init(); |
| 1726 | if (ret < 0) |
| 1727 | xen_evtchn_2l_init(); |
David Vrabel | ab9a1cc | 2013-03-14 12:49:19 +0000 | [diff] [blame] | 1728 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 1729 | evtchn_to_irq = kcalloc(EVTCHN_ROW(xen_evtchn_max_channels()), |
| 1730 | sizeof(*evtchn_to_irq), GFP_KERNEL); |
Konrad Rzeszutek Wilk | 9d093e2 | 2011-09-29 13:31:21 -0400 | [diff] [blame] | 1731 | BUG_ON(!evtchn_to_irq); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1732 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1733 | /* No event channels are 'live' right now. */ |
Juergen Gross | e91b2b1 | 2017-07-17 19:47:03 +0200 | [diff] [blame] | 1734 | for (evtchn = 0; evtchn < xen_evtchn_nr_channels(); evtchn++) |
| 1735 | mask_evtchn(evtchn); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1736 | |
Stefano Stabellini | 9846ff1 | 2012-01-30 16:21:48 +0000 | [diff] [blame] | 1737 | pirq_needs_eoi = pirq_needs_eoi_flag; |
| 1738 | |
Stefano Stabellini | 0ec53ec | 2012-09-14 13:37:32 +0000 | [diff] [blame] | 1739 | #ifdef CONFIG_X86 |
Mukesh Rathor | 2771374 | 2013-12-11 15:36:51 -0500 | [diff] [blame] | 1740 | if (xen_pv_domain()) { |
| 1741 | irq_ctx_init(smp_processor_id()); |
| 1742 | if (xen_initial_domain()) |
| 1743 | pci_xen_initial_domain(); |
| 1744 | } |
| 1745 | if (xen_feature(XENFEAT_hvm_callback_vector)) |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1746 | xen_callback_vector(); |
Mukesh Rathor | 2771374 | 2013-12-11 15:36:51 -0500 | [diff] [blame] | 1747 | |
| 1748 | if (xen_hvm_domain()) { |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1749 | native_init_IRQ(); |
Stefano Stabellini | 3942b74 | 2010-06-24 17:50:18 +0100 | [diff] [blame] | 1750 | /* pci_xen_hvm_init must be called after native_init_IRQ so that |
| 1751 | * __acpi_register_gsi can point at the right function */ |
| 1752 | pci_xen_hvm_init(); |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1753 | } else { |
Stefano Stabellini | 0ec53ec | 2012-09-14 13:37:32 +0000 | [diff] [blame] | 1754 | int rc; |
Stefano Stabellini | 9846ff1 | 2012-01-30 16:21:48 +0000 | [diff] [blame] | 1755 | struct physdev_pirq_eoi_gmfn eoi_gmfn; |
| 1756 | |
Stefano Stabellini | 9846ff1 | 2012-01-30 16:21:48 +0000 | [diff] [blame] | 1757 | pirq_eoi_map = (void *)__get_free_page(GFP_KERNEL|__GFP_ZERO); |
Julien Grall | 0df4f26 | 2015-08-07 17:34:37 +0100 | [diff] [blame] | 1758 | eoi_gmfn.gmfn = virt_to_gfn(pirq_eoi_map); |
Stefano Stabellini | 9846ff1 | 2012-01-30 16:21:48 +0000 | [diff] [blame] | 1759 | rc = HYPERVISOR_physdev_op(PHYSDEVOP_pirq_eoi_gmfn_v2, &eoi_gmfn); |
| 1760 | if (rc != 0) { |
| 1761 | free_page((unsigned long) pirq_eoi_map); |
| 1762 | pirq_eoi_map = NULL; |
| 1763 | } else |
| 1764 | pirq_needs_eoi = pirq_check_eoi_map; |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1765 | } |
Stefano Stabellini | 0ec53ec | 2012-09-14 13:37:32 +0000 | [diff] [blame] | 1766 | #endif |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1767 | } |