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> |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 35 | |
Stefano Stabellini | 0ec53ec | 2012-09-14 13:37:32 +0000 | [diff] [blame] | 36 | #ifdef CONFIG_X86 |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 37 | #include <asm/desc.h> |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 38 | #include <asm/ptrace.h> |
| 39 | #include <asm/irq.h> |
Konrad Rzeszutek Wilk | 0794bfc | 2010-10-18 10:41:08 -0400 | [diff] [blame] | 40 | #include <asm/io_apic.h> |
Boris Ostrovsky | b4ff838 | 2015-11-20 11:25:04 -0500 | [diff] [blame] | 41 | #include <asm/i8259.h> |
Stefano Stabellini | 42a1de5 | 2010-06-24 16:42:04 +0100 | [diff] [blame] | 42 | #include <asm/xen/pci.h> |
Stefano Stabellini | 0ec53ec | 2012-09-14 13:37:32 +0000 | [diff] [blame] | 43 | #endif |
| 44 | #include <asm/sync_bitops.h> |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 45 | #include <asm/xen/hypercall.h> |
Adrian Bunk | 8d1b875 | 2007-07-20 00:31:44 -0700 | [diff] [blame] | 46 | #include <asm/xen/hypervisor.h> |
Julien Grall | a001c9d | 2015-05-05 16:37:30 +0100 | [diff] [blame] | 47 | #include <xen/page.h> |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 48 | |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 49 | #include <xen/xen.h> |
| 50 | #include <xen/hvm.h> |
Isaku Yamahata | e04d0d0 | 2008-04-02 10:53:55 -0700 | [diff] [blame] | 51 | #include <xen/xen-ops.h> |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 52 | #include <xen/events.h> |
| 53 | #include <xen/interface/xen.h> |
| 54 | #include <xen/interface/event_channel.h> |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 55 | #include <xen/interface/hvm/hvm_op.h> |
| 56 | #include <xen/interface/hvm/params.h> |
Stefano Stabellini | 0ec53ec | 2012-09-14 13:37:32 +0000 | [diff] [blame] | 57 | #include <xen/interface/physdev.h> |
| 58 | #include <xen/interface/sched.h> |
Konrad Rzeszutek Wilk | 6efa20e | 2013-07-19 11:51:31 -0400 | [diff] [blame] | 59 | #include <xen/interface/vcpu.h> |
Stefano Stabellini | 0ec53ec | 2012-09-14 13:37:32 +0000 | [diff] [blame] | 60 | #include <asm/hw_irq.h> |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 61 | |
David Vrabel | 9a489f4 | 2013-03-13 15:29:25 +0000 | [diff] [blame] | 62 | #include "events_internal.h" |
| 63 | |
David Vrabel | ab9a1cc | 2013-03-14 12:49:19 +0000 | [diff] [blame] | 64 | const struct evtchn_ops *evtchn_ops; |
| 65 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 66 | /* |
| 67 | * This lock protects updates to the following mapping and reference-count |
| 68 | * arrays. The lock does not need to be acquired to read the mapping tables. |
| 69 | */ |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 70 | static DEFINE_MUTEX(irq_mapping_update_lock); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 71 | |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 72 | static LIST_HEAD(xen_irq_list_head); |
| 73 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 74 | /* IRQ <-> VIRQ mapping. */ |
Tejun Heo | 204fba4 | 2009-06-24 15:13:45 +0900 | [diff] [blame] | 75 | 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] | 76 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 77 | /* IRQ <-> IPI mapping */ |
Tejun Heo | 204fba4 | 2009-06-24 15:13:45 +0900 | [diff] [blame] | 78 | 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] | 79 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 80 | int **evtchn_to_irq; |
Ian Campbell | bf86ad8 | 2012-10-17 09:39:12 +0100 | [diff] [blame] | 81 | #ifdef CONFIG_X86 |
Stefano Stabellini | 9846ff1 | 2012-01-30 16:21:48 +0000 | [diff] [blame] | 82 | static unsigned long *pirq_eoi_map; |
Ian Campbell | bf86ad8 | 2012-10-17 09:39:12 +0100 | [diff] [blame] | 83 | #endif |
Stefano Stabellini | 9846ff1 | 2012-01-30 16:21:48 +0000 | [diff] [blame] | 84 | static bool (*pirq_needs_eoi)(unsigned irq); |
Jeremy Fitzhardinge | 3b32f57 | 2009-08-13 12:50:37 -0700 | [diff] [blame] | 85 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 86 | #define EVTCHN_ROW(e) (e / (PAGE_SIZE/sizeof(**evtchn_to_irq))) |
| 87 | #define EVTCHN_COL(e) (e % (PAGE_SIZE/sizeof(**evtchn_to_irq))) |
| 88 | #define EVTCHN_PER_ROW (PAGE_SIZE / sizeof(**evtchn_to_irq)) |
| 89 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 90 | /* Xen will never allocate port zero for any purpose. */ |
| 91 | #define VALID_EVTCHN(chn) ((chn) != 0) |
| 92 | |
Juergen Gross | 82856cd | 2020-09-30 11:16:14 +0200 | [diff] [blame^] | 93 | static struct irq_info *legacy_info_ptrs[NR_IRQS_LEGACY]; |
| 94 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 95 | static struct irq_chip xen_dynamic_chip; |
Jeremy Fitzhardinge | aaca496 | 2010-08-20 18:57:53 -0700 | [diff] [blame] | 96 | static struct irq_chip xen_percpu_chip; |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 97 | static struct irq_chip xen_pirq_chip; |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 98 | static void enable_dynirq(struct irq_data *data); |
| 99 | static void disable_dynirq(struct irq_data *data); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 100 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 101 | static void clear_evtchn_to_irq_row(unsigned row) |
| 102 | { |
| 103 | unsigned col; |
| 104 | |
| 105 | for (col = 0; col < EVTCHN_PER_ROW; col++) |
| 106 | evtchn_to_irq[row][col] = -1; |
| 107 | } |
| 108 | |
| 109 | static void clear_evtchn_to_irq_all(void) |
| 110 | { |
| 111 | unsigned row; |
| 112 | |
| 113 | for (row = 0; row < EVTCHN_ROW(xen_evtchn_max_channels()); row++) { |
| 114 | if (evtchn_to_irq[row] == NULL) |
| 115 | continue; |
| 116 | clear_evtchn_to_irq_row(row); |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | static int set_evtchn_to_irq(unsigned evtchn, unsigned irq) |
| 121 | { |
| 122 | unsigned row; |
| 123 | unsigned col; |
| 124 | |
| 125 | if (evtchn >= xen_evtchn_max_channels()) |
| 126 | return -EINVAL; |
| 127 | |
| 128 | row = EVTCHN_ROW(evtchn); |
| 129 | col = EVTCHN_COL(evtchn); |
| 130 | |
| 131 | if (evtchn_to_irq[row] == NULL) { |
| 132 | /* Unallocated irq entries return -1 anyway */ |
| 133 | if (irq == -1) |
| 134 | return 0; |
| 135 | |
| 136 | evtchn_to_irq[row] = (int *)get_zeroed_page(GFP_KERNEL); |
| 137 | if (evtchn_to_irq[row] == NULL) |
| 138 | return -ENOMEM; |
| 139 | |
| 140 | clear_evtchn_to_irq_row(row); |
| 141 | } |
| 142 | |
Josh Abraham | 4dca864 | 2018-09-12 15:13:54 -1000 | [diff] [blame] | 143 | evtchn_to_irq[row][col] = irq; |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 144 | return 0; |
| 145 | } |
| 146 | |
| 147 | int get_evtchn_to_irq(unsigned evtchn) |
| 148 | { |
| 149 | if (evtchn >= xen_evtchn_max_channels()) |
| 150 | return -1; |
| 151 | if (evtchn_to_irq[EVTCHN_ROW(evtchn)] == NULL) |
| 152 | return -1; |
| 153 | return evtchn_to_irq[EVTCHN_ROW(evtchn)][EVTCHN_COL(evtchn)]; |
| 154 | } |
| 155 | |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 156 | /* Get info for IRQ */ |
David Vrabel | 9a489f4 | 2013-03-13 15:29:25 +0000 | [diff] [blame] | 157 | struct irq_info *info_for_irq(unsigned irq) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 158 | { |
Juergen Gross | 82856cd | 2020-09-30 11:16:14 +0200 | [diff] [blame^] | 159 | if (irq < nr_legacy_irqs()) |
| 160 | return legacy_info_ptrs[irq]; |
| 161 | else |
| 162 | return irq_get_chip_data(irq); |
| 163 | } |
| 164 | |
| 165 | static void set_info_for_irq(unsigned int irq, struct irq_info *info) |
| 166 | { |
| 167 | if (irq < nr_legacy_irqs()) |
| 168 | legacy_info_ptrs[irq] = info; |
| 169 | else |
| 170 | irq_set_chip_data(irq, info); |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 171 | } |
| 172 | |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 173 | /* Constructors for packed IRQ information. */ |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 174 | static int xen_irq_info_common_setup(struct irq_info *info, |
Ian Campbell | 3d4cfa3 | 2011-03-10 16:08:10 +0000 | [diff] [blame] | 175 | unsigned irq, |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 176 | enum xen_irq_type type, |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 177 | unsigned evtchn, |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 178 | unsigned short cpu) |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 179 | { |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 180 | int ret; |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 181 | |
| 182 | BUG_ON(info->type != IRQT_UNBOUND && info->type != type); |
| 183 | |
| 184 | info->type = type; |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 185 | info->irq = irq; |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 186 | info->evtchn = evtchn; |
| 187 | info->cpu = cpu; |
Ian Campbell | 3d4cfa3 | 2011-03-10 16:08:10 +0000 | [diff] [blame] | 188 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 189 | ret = set_evtchn_to_irq(evtchn, irq); |
| 190 | if (ret < 0) |
| 191 | return ret; |
Julien Grall | 934f585 | 2013-04-30 18:29:13 +0100 | [diff] [blame] | 192 | |
| 193 | irq_clear_status_flags(irq, IRQ_NOREQUEST|IRQ_NOAUTOEN); |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 194 | |
David Vrabel | 0838587 | 2013-03-18 16:54:57 +0000 | [diff] [blame] | 195 | return xen_evtchn_port_setup(info); |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 196 | } |
| 197 | |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 198 | static int xen_irq_info_evtchn_setup(unsigned irq, |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 199 | unsigned evtchn) |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 200 | { |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 201 | struct irq_info *info = info_for_irq(irq); |
| 202 | |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 203 | return xen_irq_info_common_setup(info, irq, IRQT_EVTCHN, evtchn, 0); |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 204 | } |
| 205 | |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 206 | static int xen_irq_info_ipi_setup(unsigned cpu, |
Ian Campbell | 3d4cfa3 | 2011-03-10 16:08:10 +0000 | [diff] [blame] | 207 | unsigned irq, |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 208 | unsigned evtchn, |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 209 | enum ipi_vector ipi) |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 210 | { |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 211 | struct irq_info *info = info_for_irq(irq); |
| 212 | |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 213 | info->u.ipi = ipi; |
Ian Campbell | 3d4cfa3 | 2011-03-10 16:08:10 +0000 | [diff] [blame] | 214 | |
| 215 | per_cpu(ipi_to_irq, cpu)[ipi] = irq; |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 216 | |
| 217 | return xen_irq_info_common_setup(info, irq, IRQT_IPI, evtchn, 0); |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 218 | } |
| 219 | |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 220 | static int xen_irq_info_virq_setup(unsigned cpu, |
Ian Campbell | 3d4cfa3 | 2011-03-10 16:08:10 +0000 | [diff] [blame] | 221 | unsigned irq, |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 222 | unsigned evtchn, |
| 223 | unsigned virq) |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 224 | { |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 225 | struct irq_info *info = info_for_irq(irq); |
| 226 | |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 227 | info->u.virq = virq; |
Ian Campbell | 3d4cfa3 | 2011-03-10 16:08:10 +0000 | [diff] [blame] | 228 | |
| 229 | per_cpu(virq_to_irq, cpu)[virq] = irq; |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 230 | |
| 231 | return xen_irq_info_common_setup(info, irq, IRQT_VIRQ, evtchn, 0); |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 232 | } |
| 233 | |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 234 | static int xen_irq_info_pirq_setup(unsigned irq, |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 235 | unsigned evtchn, |
| 236 | unsigned pirq, |
| 237 | unsigned gsi, |
Konrad Rzeszutek Wilk | beafbdc | 2011-04-14 11:17:36 -0400 | [diff] [blame] | 238 | uint16_t domid, |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 239 | unsigned char flags) |
| 240 | { |
| 241 | struct irq_info *info = info_for_irq(irq); |
| 242 | |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 243 | info->u.pirq.pirq = pirq; |
| 244 | info->u.pirq.gsi = gsi; |
Konrad Rzeszutek Wilk | beafbdc | 2011-04-14 11:17:36 -0400 | [diff] [blame] | 245 | info->u.pirq.domid = domid; |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 246 | info->u.pirq.flags = flags; |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 247 | |
| 248 | return xen_irq_info_common_setup(info, irq, IRQT_PIRQ, evtchn, 0); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 249 | } |
| 250 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 251 | static void xen_irq_info_cleanup(struct irq_info *info) |
| 252 | { |
| 253 | set_evtchn_to_irq(info->evtchn, -1); |
| 254 | info->evtchn = 0; |
| 255 | } |
| 256 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 257 | /* |
| 258 | * Accessors for packed IRQ information. |
| 259 | */ |
David Vrabel | 9a489f4 | 2013-03-13 15:29:25 +0000 | [diff] [blame] | 260 | unsigned int evtchn_from_irq(unsigned irq) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 261 | { |
Andrey Utkin | 474b8fe | 2014-07-17 19:25:50 +0300 | [diff] [blame] | 262 | if (unlikely(WARN(irq >= nr_irqs, "Invalid irq %d!\n", irq))) |
Joe Jin | 110e7c7 | 2011-01-07 14:50:12 +0800 | [diff] [blame] | 263 | return 0; |
| 264 | |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 265 | return info_for_irq(irq)->evtchn; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 266 | } |
| 267 | |
Ian Campbell | d4c0453 | 2009-02-06 19:20:31 -0800 | [diff] [blame] | 268 | unsigned irq_from_evtchn(unsigned int evtchn) |
| 269 | { |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 270 | return get_evtchn_to_irq(evtchn); |
Ian Campbell | d4c0453 | 2009-02-06 19:20:31 -0800 | [diff] [blame] | 271 | } |
| 272 | EXPORT_SYMBOL_GPL(irq_from_evtchn); |
| 273 | |
David Vrabel | 9a489f4 | 2013-03-13 15:29:25 +0000 | [diff] [blame] | 274 | int irq_from_virq(unsigned int cpu, unsigned int virq) |
| 275 | { |
| 276 | return per_cpu(virq_to_irq, cpu)[virq]; |
| 277 | } |
| 278 | |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 279 | static enum ipi_vector ipi_from_irq(unsigned irq) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 280 | { |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 281 | struct irq_info *info = info_for_irq(irq); |
| 282 | |
| 283 | BUG_ON(info == NULL); |
| 284 | BUG_ON(info->type != IRQT_IPI); |
| 285 | |
| 286 | return info->u.ipi; |
| 287 | } |
| 288 | |
| 289 | static unsigned virq_from_irq(unsigned irq) |
| 290 | { |
| 291 | struct irq_info *info = info_for_irq(irq); |
| 292 | |
| 293 | BUG_ON(info == NULL); |
| 294 | BUG_ON(info->type != IRQT_VIRQ); |
| 295 | |
| 296 | return info->u.virq; |
| 297 | } |
| 298 | |
Stefano Stabellini | 7a043f1 | 2010-07-01 17:08:14 +0100 | [diff] [blame] | 299 | static unsigned pirq_from_irq(unsigned irq) |
| 300 | { |
| 301 | struct irq_info *info = info_for_irq(irq); |
| 302 | |
| 303 | BUG_ON(info == NULL); |
| 304 | BUG_ON(info->type != IRQT_PIRQ); |
| 305 | |
| 306 | return info->u.pirq.pirq; |
| 307 | } |
| 308 | |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 309 | static enum xen_irq_type type_from_irq(unsigned irq) |
| 310 | { |
| 311 | return info_for_irq(irq)->type; |
| 312 | } |
| 313 | |
David Vrabel | 9a489f4 | 2013-03-13 15:29:25 +0000 | [diff] [blame] | 314 | unsigned cpu_from_irq(unsigned irq) |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 315 | { |
| 316 | return info_for_irq(irq)->cpu; |
| 317 | } |
| 318 | |
David Vrabel | 9a489f4 | 2013-03-13 15:29:25 +0000 | [diff] [blame] | 319 | unsigned int cpu_from_evtchn(unsigned int evtchn) |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 320 | { |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 321 | int irq = get_evtchn_to_irq(evtchn); |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 322 | unsigned ret = 0; |
| 323 | |
| 324 | if (irq != -1) |
| 325 | ret = cpu_from_irq(irq); |
| 326 | |
| 327 | return ret; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 328 | } |
| 329 | |
Ian Campbell | bf86ad8 | 2012-10-17 09:39:12 +0100 | [diff] [blame] | 330 | #ifdef CONFIG_X86 |
Stefano Stabellini | 9846ff1 | 2012-01-30 16:21:48 +0000 | [diff] [blame] | 331 | static bool pirq_check_eoi_map(unsigned irq) |
| 332 | { |
Stefano Stabellini | 521394e | 2012-04-25 16:11:38 +0100 | [diff] [blame] | 333 | return test_bit(pirq_from_irq(irq), pirq_eoi_map); |
Stefano Stabellini | 9846ff1 | 2012-01-30 16:21:48 +0000 | [diff] [blame] | 334 | } |
Ian Campbell | bf86ad8 | 2012-10-17 09:39:12 +0100 | [diff] [blame] | 335 | #endif |
Stefano Stabellini | 9846ff1 | 2012-01-30 16:21:48 +0000 | [diff] [blame] | 336 | |
| 337 | static bool pirq_needs_eoi_flag(unsigned irq) |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 338 | { |
| 339 | struct irq_info *info = info_for_irq(irq); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 340 | BUG_ON(info->type != IRQT_PIRQ); |
| 341 | |
| 342 | return info->u.pirq.flags & PIRQ_NEEDS_EOI; |
| 343 | } |
| 344 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 345 | static void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu) |
| 346 | { |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 347 | int irq = get_evtchn_to_irq(chn); |
David Vrabel | 9a489f4 | 2013-03-13 15:29:25 +0000 | [diff] [blame] | 348 | struct irq_info *info = info_for_irq(irq); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 349 | |
| 350 | BUG_ON(irq == -1); |
| 351 | #ifdef CONFIG_SMP |
Jiang Liu | c149e4c | 2015-06-03 11:46:22 +0800 | [diff] [blame] | 352 | cpumask_copy(irq_get_affinity_mask(irq), cpumask_of(cpu)); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 353 | #endif |
David Vrabel | 9a489f4 | 2013-03-13 15:29:25 +0000 | [diff] [blame] | 354 | xen_evtchn_port_bind_to_cpu(info, cpu); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 355 | |
David Vrabel | 9a489f4 | 2013-03-13 15:29:25 +0000 | [diff] [blame] | 356 | info->cpu = cpu; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 357 | } |
| 358 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 359 | /** |
| 360 | * notify_remote_via_irq - send event to remote end of event channel via irq |
| 361 | * @irq: irq of event channel to send event to |
| 362 | * |
| 363 | * Unlike notify_remote_via_evtchn(), this is safe to use across |
| 364 | * save/restore. Notifications on a broken connection are silently |
| 365 | * dropped. |
| 366 | */ |
| 367 | void notify_remote_via_irq(int irq) |
| 368 | { |
| 369 | int evtchn = evtchn_from_irq(irq); |
| 370 | |
| 371 | if (VALID_EVTCHN(evtchn)) |
| 372 | notify_remote_via_evtchn(evtchn); |
| 373 | } |
| 374 | EXPORT_SYMBOL_GPL(notify_remote_via_irq); |
| 375 | |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 376 | static void xen_irq_init(unsigned irq) |
| 377 | { |
| 378 | struct irq_info *info; |
Konrad Rzeszutek Wilk | b5328cd | 2011-06-15 14:24:29 -0400 | [diff] [blame] | 379 | #ifdef CONFIG_SMP |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 380 | /* By default all event channels notify CPU#0. */ |
Jiang Liu | c149e4c | 2015-06-03 11:46:22 +0800 | [diff] [blame] | 381 | cpumask_copy(irq_get_affinity_mask(irq), cpumask_of(0)); |
Konrad Rzeszutek Wilk | 44626e4 | 2011-03-15 16:40:33 -0400 | [diff] [blame] | 382 | #endif |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 383 | |
Ian Campbell | ca62ce8 | 2011-03-10 16:08:12 +0000 | [diff] [blame] | 384 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
| 385 | if (info == NULL) |
| 386 | panic("Unable to allocate metadata for IRQ%d\n", irq); |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 387 | |
| 388 | info->type = IRQT_UNBOUND; |
Daniel De Graaf | 420eb55 | 2011-10-27 17:58:47 -0400 | [diff] [blame] | 389 | info->refcnt = -1; |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 390 | |
Juergen Gross | 82856cd | 2020-09-30 11:16:14 +0200 | [diff] [blame^] | 391 | set_info_for_irq(irq, info); |
Ian Campbell | ca62ce8 | 2011-03-10 16:08:12 +0000 | [diff] [blame] | 392 | |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 393 | list_add_tail(&info->list, &xen_irq_list_head); |
| 394 | } |
| 395 | |
Roger Pau Monne | 4892c9b | 2014-02-27 19:15:35 +0100 | [diff] [blame] | 396 | static int __must_check xen_allocate_irqs_dynamic(int nvec) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 397 | { |
Thomas Gleixner | d07c9f1 | 2014-05-07 15:44:10 +0000 | [diff] [blame] | 398 | int i, irq = irq_alloc_descs(-1, 0, nvec, -1); |
Ian Campbell | 8991150 | 2011-03-03 11:57:44 -0500 | [diff] [blame] | 399 | |
Roger Pau Monne | 4892c9b | 2014-02-27 19:15:35 +0100 | [diff] [blame] | 400 | if (irq >= 0) { |
| 401 | for (i = 0; i < nvec; i++) |
| 402 | xen_irq_init(irq + i); |
| 403 | } |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 404 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 405 | return irq; |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 406 | } |
| 407 | |
Roger Pau Monne | 4892c9b | 2014-02-27 19:15:35 +0100 | [diff] [blame] | 408 | static inline int __must_check xen_allocate_irq_dynamic(void) |
| 409 | { |
| 410 | |
| 411 | return xen_allocate_irqs_dynamic(1); |
| 412 | } |
| 413 | |
Ian Campbell | 7bee976 | 2011-03-10 16:08:15 +0000 | [diff] [blame] | 414 | static int __must_check xen_allocate_irq_gsi(unsigned gsi) |
Ian Campbell | c9df1ce | 2011-01-11 17:20:15 +0000 | [diff] [blame] | 415 | { |
| 416 | int irq; |
| 417 | |
Ian Campbell | 8991150 | 2011-03-03 11:57:44 -0500 | [diff] [blame] | 418 | /* |
| 419 | * A PV guest has no concept of a GSI (since it has no ACPI |
| 420 | * nor access to/knowledge of the physical APICs). Therefore |
| 421 | * all IRQs are dynamically allocated from the entire IRQ |
| 422 | * space. |
| 423 | */ |
| 424 | if (xen_pv_domain() && !xen_initial_domain()) |
Ian Campbell | c9df1ce | 2011-01-11 17:20:15 +0000 | [diff] [blame] | 425 | return xen_allocate_irq_dynamic(); |
| 426 | |
| 427 | /* Legacy IRQ descriptors are already allocated by the arch. */ |
Boris Ostrovsky | b4ff838 | 2015-11-20 11:25:04 -0500 | [diff] [blame] | 428 | if (gsi < nr_legacy_irqs()) |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 429 | irq = gsi; |
| 430 | else |
| 431 | irq = irq_alloc_desc_at(gsi, -1); |
Ian Campbell | c9df1ce | 2011-01-11 17:20:15 +0000 | [diff] [blame] | 432 | |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 433 | xen_irq_init(irq); |
Ian Campbell | c9df1ce | 2011-01-11 17:20:15 +0000 | [diff] [blame] | 434 | |
| 435 | return irq; |
| 436 | } |
| 437 | |
| 438 | static void xen_free_irq(unsigned irq) |
| 439 | { |
Juergen Gross | 82856cd | 2020-09-30 11:16:14 +0200 | [diff] [blame^] | 440 | struct irq_info *info = info_for_irq(irq); |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 441 | |
Konrad Rzeszutek Wilk | 94032c5 | 2013-04-16 10:55:18 -0400 | [diff] [blame] | 442 | if (WARN_ON(!info)) |
| 443 | return; |
| 444 | |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 445 | list_del(&info->list); |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 446 | |
Juergen Gross | 82856cd | 2020-09-30 11:16:14 +0200 | [diff] [blame^] | 447 | set_info_for_irq(irq, NULL); |
Ian Campbell | ca62ce8 | 2011-03-10 16:08:12 +0000 | [diff] [blame] | 448 | |
Daniel De Graaf | 420eb55 | 2011-10-27 17:58:47 -0400 | [diff] [blame] | 449 | WARN_ON(info->refcnt > 0); |
| 450 | |
Ian Campbell | ca62ce8 | 2011-03-10 16:08:12 +0000 | [diff] [blame] | 451 | kfree(info); |
| 452 | |
Ian Campbell | 7214610 | 2011-02-03 09:49:35 +0000 | [diff] [blame] | 453 | /* Legacy IRQ descriptors are managed by the arch. */ |
Boris Ostrovsky | b4ff838 | 2015-11-20 11:25:04 -0500 | [diff] [blame] | 454 | if (irq < nr_legacy_irqs()) |
Ian Campbell | 7214610 | 2011-02-03 09:49:35 +0000 | [diff] [blame] | 455 | return; |
| 456 | |
Ian Campbell | c9df1ce | 2011-01-11 17:20:15 +0000 | [diff] [blame] | 457 | irq_free_desc(irq); |
| 458 | } |
| 459 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 460 | static void xen_evtchn_close(unsigned int port) |
| 461 | { |
| 462 | struct evtchn_close close; |
| 463 | |
| 464 | close.port = port; |
| 465 | if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0) |
| 466 | BUG(); |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 467 | } |
| 468 | |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 469 | static void pirq_query_unmask(int irq) |
| 470 | { |
| 471 | struct physdev_irq_status_query irq_status; |
| 472 | struct irq_info *info = info_for_irq(irq); |
| 473 | |
| 474 | BUG_ON(info->type != IRQT_PIRQ); |
| 475 | |
Stefano Stabellini | 7a043f1 | 2010-07-01 17:08:14 +0100 | [diff] [blame] | 476 | irq_status.irq = pirq_from_irq(irq); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 477 | if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status)) |
| 478 | irq_status.flags = 0; |
| 479 | |
| 480 | info->u.pirq.flags &= ~PIRQ_NEEDS_EOI; |
| 481 | if (irq_status.flags & XENIRQSTAT_needs_eoi) |
| 482 | info->u.pirq.flags |= PIRQ_NEEDS_EOI; |
| 483 | } |
| 484 | |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 485 | static void eoi_pirq(struct irq_data *data) |
| 486 | { |
| 487 | int evtchn = evtchn_from_irq(data->irq); |
| 488 | struct physdev_eoi eoi = { .irq = pirq_from_irq(data->irq) }; |
| 489 | int rc = 0; |
| 490 | |
Boris Ostrovsky | ff1e22e | 2016-03-18 10:11:07 -0400 | [diff] [blame] | 491 | if (!VALID_EVTCHN(evtchn)) |
| 492 | return; |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 493 | |
Ross Lagerwall | f0f3938 | 2016-05-10 16:11:00 +0100 | [diff] [blame] | 494 | if (unlikely(irqd_is_setaffinity_pending(data)) && |
| 495 | likely(!irqd_irq_disabled(data))) { |
Boris Ostrovsky | ff1e22e | 2016-03-18 10:11:07 -0400 | [diff] [blame] | 496 | int masked = test_and_set_mask(evtchn); |
| 497 | |
| 498 | clear_evtchn(evtchn); |
| 499 | |
| 500 | irq_move_masked_irq(data); |
| 501 | |
| 502 | if (!masked) |
| 503 | unmask_evtchn(evtchn); |
| 504 | } else |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 505 | clear_evtchn(evtchn); |
| 506 | |
| 507 | if (pirq_needs_eoi(data->irq)) { |
| 508 | rc = HYPERVISOR_physdev_op(PHYSDEVOP_eoi, &eoi); |
| 509 | WARN_ON(rc); |
| 510 | } |
| 511 | } |
| 512 | |
| 513 | static void mask_ack_pirq(struct irq_data *data) |
| 514 | { |
| 515 | disable_dynirq(data); |
| 516 | eoi_pirq(data); |
| 517 | } |
| 518 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 519 | static unsigned int __startup_pirq(unsigned int irq) |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 520 | { |
| 521 | struct evtchn_bind_pirq bind_pirq; |
| 522 | struct irq_info *info = info_for_irq(irq); |
| 523 | int evtchn = evtchn_from_irq(irq); |
Konrad Rzeszutek Wilk | 15ebbb8 | 2010-10-04 13:43:27 -0400 | [diff] [blame] | 524 | int rc; |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 525 | |
| 526 | BUG_ON(info->type != IRQT_PIRQ); |
| 527 | |
| 528 | if (VALID_EVTCHN(evtchn)) |
| 529 | goto out; |
| 530 | |
Stefano Stabellini | 7a043f1 | 2010-07-01 17:08:14 +0100 | [diff] [blame] | 531 | bind_pirq.pirq = pirq_from_irq(irq); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 532 | /* NB. We are happy to share unless we are probing. */ |
Konrad Rzeszutek Wilk | 15ebbb8 | 2010-10-04 13:43:27 -0400 | [diff] [blame] | 533 | bind_pirq.flags = info->u.pirq.flags & PIRQ_SHAREABLE ? |
| 534 | BIND_PIRQ__WILL_SHARE : 0; |
| 535 | rc = HYPERVISOR_event_channel_op(EVTCHNOP_bind_pirq, &bind_pirq); |
| 536 | if (rc != 0) { |
Thomas Gleixner | 02893af | 2014-02-23 21:40:20 +0000 | [diff] [blame] | 537 | pr_warn("Failed to obtain physical IRQ %d\n", irq); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 538 | return 0; |
| 539 | } |
| 540 | evtchn = bind_pirq.port; |
| 541 | |
| 542 | pirq_query_unmask(irq); |
| 543 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 544 | rc = set_evtchn_to_irq(evtchn, irq); |
Juergen Gross | 85e40b0 | 2015-02-26 06:52:05 +0100 | [diff] [blame] | 545 | if (rc) |
| 546 | goto err; |
| 547 | |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 548 | info->evtchn = evtchn; |
Boris Ostrovsky | 16e6bd5 | 2015-04-29 17:10:15 -0400 | [diff] [blame] | 549 | bind_evtchn_to_cpu(evtchn, 0); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 550 | |
Juergen Gross | 85e40b0 | 2015-02-26 06:52:05 +0100 | [diff] [blame] | 551 | rc = xen_evtchn_port_setup(info); |
| 552 | if (rc) |
| 553 | goto err; |
| 554 | |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 555 | out: |
| 556 | unmask_evtchn(evtchn); |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 557 | eoi_pirq(irq_get_irq_data(irq)); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 558 | |
| 559 | return 0; |
Juergen Gross | 85e40b0 | 2015-02-26 06:52:05 +0100 | [diff] [blame] | 560 | |
| 561 | err: |
| 562 | pr_err("irq%d: Failed to set port to irq mapping (%d)\n", irq, rc); |
| 563 | xen_evtchn_close(evtchn); |
| 564 | return 0; |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 565 | } |
| 566 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 567 | static unsigned int startup_pirq(struct irq_data *data) |
| 568 | { |
| 569 | return __startup_pirq(data->irq); |
| 570 | } |
| 571 | |
| 572 | static void shutdown_pirq(struct irq_data *data) |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 573 | { |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 574 | unsigned int irq = data->irq; |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 575 | struct irq_info *info = info_for_irq(irq); |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 576 | unsigned evtchn = evtchn_from_irq(irq); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 577 | |
| 578 | BUG_ON(info->type != IRQT_PIRQ); |
| 579 | |
| 580 | if (!VALID_EVTCHN(evtchn)) |
| 581 | return; |
| 582 | |
| 583 | mask_evtchn(evtchn); |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 584 | xen_evtchn_close(evtchn); |
| 585 | xen_irq_info_cleanup(info); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 586 | } |
| 587 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 588 | static void enable_pirq(struct irq_data *data) |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 589 | { |
Liu Shuo | 020db9d | 2017-07-30 00:59:57 +0800 | [diff] [blame] | 590 | enable_dynirq(data); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 591 | } |
| 592 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 593 | static void disable_pirq(struct irq_data *data) |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 594 | { |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 595 | disable_dynirq(data); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 596 | } |
| 597 | |
Stefano Stabellini | 68c2c39 | 2012-05-21 16:54:10 +0100 | [diff] [blame] | 598 | int xen_irq_from_gsi(unsigned gsi) |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 599 | { |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 600 | struct irq_info *info; |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 601 | |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 602 | list_for_each_entry(info, &xen_irq_list_head, list) { |
| 603 | if (info->type != IRQT_PIRQ) |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 604 | continue; |
| 605 | |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 606 | if (info->u.pirq.gsi == gsi) |
| 607 | return info->irq; |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 608 | } |
| 609 | |
| 610 | return -1; |
| 611 | } |
Stefano Stabellini | 68c2c39 | 2012-05-21 16:54:10 +0100 | [diff] [blame] | 612 | EXPORT_SYMBOL_GPL(xen_irq_from_gsi); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 613 | |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 614 | static void __unbind_from_irq(unsigned int irq) |
| 615 | { |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 616 | int evtchn = evtchn_from_irq(irq); |
Juergen Gross | 82856cd | 2020-09-30 11:16:14 +0200 | [diff] [blame^] | 617 | struct irq_info *info = info_for_irq(irq); |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 618 | |
| 619 | if (info->refcnt > 0) { |
| 620 | info->refcnt--; |
| 621 | if (info->refcnt != 0) |
| 622 | return; |
| 623 | } |
| 624 | |
| 625 | if (VALID_EVTCHN(evtchn)) { |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 626 | unsigned int cpu = cpu_from_irq(irq); |
| 627 | |
| 628 | xen_evtchn_close(evtchn); |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 629 | |
| 630 | switch (type_from_irq(irq)) { |
| 631 | case IRQT_VIRQ: |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 632 | per_cpu(virq_to_irq, cpu)[virq_from_irq(irq)] = -1; |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 633 | break; |
| 634 | case IRQT_IPI: |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 635 | per_cpu(ipi_to_irq, cpu)[ipi_from_irq(irq)] = -1; |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 636 | break; |
| 637 | default: |
| 638 | break; |
| 639 | } |
| 640 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 641 | xen_irq_info_cleanup(info); |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 642 | } |
| 643 | |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 644 | xen_free_irq(irq); |
| 645 | } |
| 646 | |
Ian Campbell | 653378a | 2011-03-10 16:08:04 +0000 | [diff] [blame] | 647 | /* |
| 648 | * Do not make any assumptions regarding the relationship between the |
| 649 | * IRQ number returned here and the Xen pirq argument. |
Stefano Stabellini | 7a043f1 | 2010-07-01 17:08:14 +0100 | [diff] [blame] | 650 | * |
| 651 | * Note: We don't assign an event channel until the irq actually started |
| 652 | * 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] | 653 | * |
| 654 | * Shareable implies level triggered, not shareable implies edge |
| 655 | * triggered here. |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 656 | */ |
Ian Campbell | f4d0635 | 2011-03-10 16:08:07 +0000 | [diff] [blame] | 657 | int xen_bind_pirq_gsi_to_irq(unsigned gsi, |
| 658 | unsigned pirq, int shareable, char *name) |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 659 | { |
Ian Campbell | a0e1811 | 2011-03-10 16:08:03 +0000 | [diff] [blame] | 660 | int irq = -1; |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 661 | struct physdev_irq irq_op; |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 662 | int ret; |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 663 | |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 664 | mutex_lock(&irq_mapping_update_lock); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 665 | |
Stefano Stabellini | 68c2c39 | 2012-05-21 16:54:10 +0100 | [diff] [blame] | 666 | irq = xen_irq_from_gsi(gsi); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 667 | if (irq != -1) { |
Joe Perches | 283c097 | 2013-06-28 03:21:41 -0700 | [diff] [blame] | 668 | pr_info("%s: returning irq %d for gsi %u\n", |
| 669 | __func__, irq, gsi); |
Daniel De Graaf | 420eb55 | 2011-10-27 17:58:47 -0400 | [diff] [blame] | 670 | goto out; |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 671 | } |
| 672 | |
Ian Campbell | c9df1ce | 2011-01-11 17:20:15 +0000 | [diff] [blame] | 673 | irq = xen_allocate_irq_gsi(gsi); |
Ian Campbell | 7bee976 | 2011-03-10 16:08:15 +0000 | [diff] [blame] | 674 | if (irq < 0) |
| 675 | goto out; |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 676 | |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 677 | irq_op.irq = irq; |
Alex Nixon | b5401a9 | 2010-03-18 16:31:34 -0400 | [diff] [blame] | 678 | irq_op.vector = 0; |
| 679 | |
| 680 | /* Only the privileged domain can do this. For non-priv, the pcifront |
| 681 | * driver provides a PCI bus that does the call to do exactly |
| 682 | * this in the priv domain. */ |
| 683 | if (xen_initial_domain() && |
| 684 | HYPERVISOR_physdev_op(PHYSDEVOP_alloc_irq_vector, &irq_op)) { |
Ian Campbell | c9df1ce | 2011-01-11 17:20:15 +0000 | [diff] [blame] | 685 | xen_free_irq(irq); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 686 | irq = -ENOSPC; |
| 687 | goto out; |
| 688 | } |
| 689 | |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 690 | ret = xen_irq_info_pirq_setup(irq, 0, pirq, gsi, DOMID_SELF, |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 691 | shareable ? PIRQ_SHAREABLE : 0); |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 692 | if (ret < 0) { |
| 693 | __unbind_from_irq(irq); |
| 694 | irq = ret; |
| 695 | goto out; |
| 696 | } |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 697 | |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 698 | pirq_query_unmask(irq); |
| 699 | /* We try to use the handler with the appropriate semantic for the |
Stefano Stabellini | e5ac0bd | 2011-05-25 12:33:23 +0100 | [diff] [blame] | 700 | * type of interrupt: if the interrupt is an edge triggered |
| 701 | * interrupt we use handle_edge_irq. |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 702 | * |
Stefano Stabellini | e5ac0bd | 2011-05-25 12:33:23 +0100 | [diff] [blame] | 703 | * On the other hand if the interrupt is level triggered we use |
| 704 | * handle_fasteoi_irq like the native code does for this kind of |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 705 | * interrupts. |
Stefano Stabellini | e5ac0bd | 2011-05-25 12:33:23 +0100 | [diff] [blame] | 706 | * |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 707 | * Depending on the Xen version, pirq_needs_eoi might return true |
| 708 | * not only for level triggered interrupts but for edge triggered |
| 709 | * interrupts too. In any case Xen always honors the eoi mechanism, |
| 710 | * not injecting any more pirqs of the same kind if the first one |
| 711 | * hasn't received an eoi yet. Therefore using the fasteoi handler |
| 712 | * is the right choice either way. |
| 713 | */ |
Stefano Stabellini | e5ac0bd | 2011-05-25 12:33:23 +0100 | [diff] [blame] | 714 | if (shareable) |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 715 | irq_set_chip_and_handler_name(irq, &xen_pirq_chip, |
| 716 | handle_fasteoi_irq, name); |
| 717 | else |
| 718 | irq_set_chip_and_handler_name(irq, &xen_pirq_chip, |
| 719 | handle_edge_irq, name); |
| 720 | |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 721 | out: |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 722 | mutex_unlock(&irq_mapping_update_lock); |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 723 | |
| 724 | return irq; |
| 725 | } |
| 726 | |
Qing He | f731e3ef | 2010-10-11 15:30:09 +0100 | [diff] [blame] | 727 | #ifdef CONFIG_PCI_MSI |
Ian Campbell | bf480d9 | 2011-02-18 16:43:32 +0000 | [diff] [blame] | 728 | 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] | 729 | { |
Ian Campbell | 5cad61a | 2011-02-18 16:43:31 +0000 | [diff] [blame] | 730 | int rc; |
Ian Campbell | cbf6aa8 | 2011-01-11 17:20:14 +0000 | [diff] [blame] | 731 | struct physdev_get_free_pirq op_get_free_pirq; |
Ian Campbell | 5cad61a | 2011-02-18 16:43:31 +0000 | [diff] [blame] | 732 | |
Ian Campbell | bf480d9 | 2011-02-18 16:43:32 +0000 | [diff] [blame] | 733 | op_get_free_pirq.type = MAP_PIRQ_TYPE_MSI; |
Ian Campbell | cbf6aa8 | 2011-01-11 17:20:14 +0000 | [diff] [blame] | 734 | rc = HYPERVISOR_physdev_op(PHYSDEVOP_get_free_pirq, &op_get_free_pirq); |
Ian Campbell | cbf6aa8 | 2011-01-11 17:20:14 +0000 | [diff] [blame] | 735 | |
Ian Campbell | 5cad61a | 2011-02-18 16:43:31 +0000 | [diff] [blame] | 736 | WARN_ONCE(rc == -ENOSYS, |
| 737 | "hypervisor does not support the PHYSDEVOP_get_free_pirq interface\n"); |
| 738 | |
| 739 | return rc ? -1 : op_get_free_pirq.pirq; |
Ian Campbell | cbf6aa8 | 2011-01-11 17:20:14 +0000 | [diff] [blame] | 740 | } |
| 741 | |
Ian Campbell | bf480d9 | 2011-02-18 16:43:32 +0000 | [diff] [blame] | 742 | 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] | 743 | int pirq, int nvec, const char *name, domid_t domid) |
Stefano Stabellini | 809f926 | 2010-07-01 17:10:39 +0100 | [diff] [blame] | 744 | { |
Roger Pau Monne | 4892c9b | 2014-02-27 19:15:35 +0100 | [diff] [blame] | 745 | int i, irq, ret; |
Ian Campbell | 4b41df7 | 2011-02-18 16:43:29 +0000 | [diff] [blame] | 746 | |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 747 | mutex_lock(&irq_mapping_update_lock); |
Stefano Stabellini | 809f926 | 2010-07-01 17:10:39 +0100 | [diff] [blame] | 748 | |
Roger Pau Monne | 4892c9b | 2014-02-27 19:15:35 +0100 | [diff] [blame] | 749 | irq = xen_allocate_irqs_dynamic(nvec); |
Konrad Rzeszutek Wilk | e659922 | 2011-09-29 13:26:45 -0400 | [diff] [blame] | 750 | if (irq < 0) |
Ian Campbell | bb5d079 | 2011-02-18 16:43:28 +0000 | [diff] [blame] | 751 | goto out; |
Stefano Stabellini | 809f926 | 2010-07-01 17:10:39 +0100 | [diff] [blame] | 752 | |
Roger Pau Monne | 4892c9b | 2014-02-27 19:15:35 +0100 | [diff] [blame] | 753 | for (i = 0; i < nvec; i++) { |
| 754 | 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] | 755 | |
Roger Pau Monne | 4892c9b | 2014-02-27 19:15:35 +0100 | [diff] [blame] | 756 | ret = xen_irq_info_pirq_setup(irq + i, 0, pirq + i, 0, domid, |
| 757 | i == 0 ? 0 : PIRQ_MSI_GROUP); |
| 758 | if (ret < 0) |
| 759 | goto error_irq; |
| 760 | } |
| 761 | |
Linus Torvalds | 5f6fb45 | 2011-03-15 19:23:40 -0700 | [diff] [blame] | 762 | ret = irq_set_msi_desc(irq, msidesc); |
Ian Campbell | bf480d9 | 2011-02-18 16:43:32 +0000 | [diff] [blame] | 763 | if (ret < 0) |
| 764 | goto error_irq; |
Stefano Stabellini | 809f926 | 2010-07-01 17:10:39 +0100 | [diff] [blame] | 765 | out: |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 766 | mutex_unlock(&irq_mapping_update_lock); |
Ian Campbell | 4b41df7 | 2011-02-18 16:43:29 +0000 | [diff] [blame] | 767 | return irq; |
Ian Campbell | bf480d9 | 2011-02-18 16:43:32 +0000 | [diff] [blame] | 768 | error_irq: |
Roger Pau Monne | 910f8be | 2018-02-28 09:19:03 +0000 | [diff] [blame] | 769 | while (nvec--) |
| 770 | __unbind_from_irq(irq + nvec); |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 771 | mutex_unlock(&irq_mapping_update_lock); |
Konrad Rzeszutek Wilk | e659922 | 2011-09-29 13:26:45 -0400 | [diff] [blame] | 772 | return ret; |
Stefano Stabellini | 809f926 | 2010-07-01 17:10:39 +0100 | [diff] [blame] | 773 | } |
Qing He | f731e3ef | 2010-10-11 15:30:09 +0100 | [diff] [blame] | 774 | #endif |
| 775 | |
Alex Nixon | b5401a9 | 2010-03-18 16:31:34 -0400 | [diff] [blame] | 776 | int xen_destroy_irq(int irq) |
| 777 | { |
Jeremy Fitzhardinge | 38aa66f | 2010-09-02 14:51:39 +0100 | [diff] [blame] | 778 | struct physdev_unmap_pirq unmap_irq; |
| 779 | struct irq_info *info = info_for_irq(irq); |
Alex Nixon | b5401a9 | 2010-03-18 16:31:34 -0400 | [diff] [blame] | 780 | int rc = -ENOENT; |
| 781 | |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 782 | mutex_lock(&irq_mapping_update_lock); |
Alex Nixon | b5401a9 | 2010-03-18 16:31:34 -0400 | [diff] [blame] | 783 | |
Roger Pau Monne | 4892c9b | 2014-02-27 19:15:35 +0100 | [diff] [blame] | 784 | /* |
| 785 | * If trying to remove a vector in a MSI group different |
| 786 | * than the first one skip the PIRQ unmap unless this vector |
| 787 | * is the first one in the group. |
| 788 | */ |
| 789 | if (xen_initial_domain() && !(info->u.pirq.flags & PIRQ_MSI_GROUP)) { |
Konrad Rzeszutek Wilk | 1233471 | 2010-11-19 11:27:09 -0500 | [diff] [blame] | 790 | unmap_irq.pirq = info->u.pirq.pirq; |
Konrad Rzeszutek Wilk | beafbdc | 2011-04-14 11:17:36 -0400 | [diff] [blame] | 791 | unmap_irq.domid = info->u.pirq.domid; |
Jeremy Fitzhardinge | 38aa66f | 2010-09-02 14:51:39 +0100 | [diff] [blame] | 792 | rc = HYPERVISOR_physdev_op(PHYSDEVOP_unmap_pirq, &unmap_irq); |
Konrad Rzeszutek Wilk | 1eff1ad | 2011-02-16 16:26:44 -0500 | [diff] [blame] | 793 | /* If another domain quits without making the pci_disable_msix |
| 794 | * call, the Xen hypervisor takes care of freeing the PIRQs |
| 795 | * (free_domain_pirqs). |
| 796 | */ |
| 797 | if ((rc == -ESRCH && info->u.pirq.domid != DOMID_SELF)) |
Joe Perches | 283c097 | 2013-06-28 03:21:41 -0700 | [diff] [blame] | 798 | pr_info("domain %d does not have %d anymore\n", |
Konrad Rzeszutek Wilk | 1eff1ad | 2011-02-16 16:26:44 -0500 | [diff] [blame] | 799 | info->u.pirq.domid, info->u.pirq.pirq); |
| 800 | else if (rc) { |
Joe Perches | 283c097 | 2013-06-28 03:21:41 -0700 | [diff] [blame] | 801 | pr_warn("unmap irq failed %d\n", rc); |
Jeremy Fitzhardinge | 38aa66f | 2010-09-02 14:51:39 +0100 | [diff] [blame] | 802 | goto out; |
| 803 | } |
| 804 | } |
Alex Nixon | b5401a9 | 2010-03-18 16:31:34 -0400 | [diff] [blame] | 805 | |
Ian Campbell | c9df1ce | 2011-01-11 17:20:15 +0000 | [diff] [blame] | 806 | xen_free_irq(irq); |
Alex Nixon | b5401a9 | 2010-03-18 16:31:34 -0400 | [diff] [blame] | 807 | |
| 808 | out: |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 809 | mutex_unlock(&irq_mapping_update_lock); |
Alex Nixon | b5401a9 | 2010-03-18 16:31:34 -0400 | [diff] [blame] | 810 | return rc; |
| 811 | } |
| 812 | |
Stefano Stabellini | af42b8d | 2010-12-01 14:51:44 +0000 | [diff] [blame] | 813 | int xen_irq_from_pirq(unsigned pirq) |
| 814 | { |
Ian Campbell | 69c358c | 2011-03-10 16:08:13 +0000 | [diff] [blame] | 815 | int irq; |
| 816 | |
| 817 | struct irq_info *info; |
| 818 | |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 819 | mutex_lock(&irq_mapping_update_lock); |
Ian Campbell | 69c358c | 2011-03-10 16:08:13 +0000 | [diff] [blame] | 820 | |
| 821 | list_for_each_entry(info, &xen_irq_list_head, list) { |
Konrad Rzeszutek Wilk | 9bb9efe | 2011-09-29 13:13:30 -0400 | [diff] [blame] | 822 | if (info->type != IRQT_PIRQ) |
Ian Campbell | 69c358c | 2011-03-10 16:08:13 +0000 | [diff] [blame] | 823 | continue; |
| 824 | irq = info->irq; |
| 825 | if (info->u.pirq.pirq == pirq) |
| 826 | goto out; |
| 827 | } |
| 828 | irq = -1; |
| 829 | out: |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 830 | mutex_unlock(&irq_mapping_update_lock); |
Ian Campbell | 69c358c | 2011-03-10 16:08:13 +0000 | [diff] [blame] | 831 | |
| 832 | return irq; |
Stefano Stabellini | af42b8d | 2010-12-01 14:51:44 +0000 | [diff] [blame] | 833 | } |
| 834 | |
Konrad Rzeszutek Wilk | e6197ac | 2011-02-24 14:20:12 -0500 | [diff] [blame] | 835 | |
| 836 | int xen_pirq_from_irq(unsigned irq) |
| 837 | { |
| 838 | return pirq_from_irq(irq); |
| 839 | } |
| 840 | EXPORT_SYMBOL_GPL(xen_pirq_from_irq); |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 841 | |
Jeremy Fitzhardinge | b536b4b | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 842 | int bind_evtchn_to_irq(unsigned int evtchn) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 843 | { |
| 844 | int irq; |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 845 | int ret; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 846 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 847 | if (evtchn >= xen_evtchn_max_channels()) |
| 848 | return -ENOMEM; |
| 849 | |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 850 | mutex_lock(&irq_mapping_update_lock); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 851 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 852 | irq = get_evtchn_to_irq(evtchn); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 853 | |
| 854 | if (irq == -1) { |
Ian Campbell | c9df1ce | 2011-01-11 17:20:15 +0000 | [diff] [blame] | 855 | irq = xen_allocate_irq_dynamic(); |
Wei Liu | 68ba45f | 2013-01-31 14:46:56 +0000 | [diff] [blame] | 856 | if (irq < 0) |
Ian Campbell | 7bee976 | 2011-03-10 16:08:15 +0000 | [diff] [blame] | 857 | goto out; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 858 | |
Thomas Gleixner | c442b80 | 2011-03-25 10:58:06 +0100 | [diff] [blame] | 859 | irq_set_chip_and_handler_name(irq, &xen_dynamic_chip, |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 860 | handle_edge_irq, "event"); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 861 | |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 862 | ret = xen_irq_info_evtchn_setup(irq, evtchn); |
| 863 | if (ret < 0) { |
| 864 | __unbind_from_irq(irq); |
| 865 | irq = ret; |
| 866 | goto out; |
| 867 | } |
David Vrabel | 97253ee | 2014-02-05 14:13:10 +0000 | [diff] [blame] | 868 | /* New interdomain events are bound to VCPU 0. */ |
| 869 | bind_evtchn_to_cpu(evtchn, 0); |
Konrad Rzeszutek Wilk | 5e152e6 | 2012-05-23 13:28:44 -0400 | [diff] [blame] | 870 | } else { |
| 871 | struct irq_info *info = info_for_irq(irq); |
| 872 | WARN_ON(info == NULL || info->type != IRQT_EVTCHN); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 873 | } |
| 874 | |
Ian Campbell | 7bee976 | 2011-03-10 16:08:15 +0000 | [diff] [blame] | 875 | out: |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 876 | mutex_unlock(&irq_mapping_update_lock); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 877 | |
| 878 | return irq; |
| 879 | } |
Jeremy Fitzhardinge | b536b4b | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 880 | EXPORT_SYMBOL_GPL(bind_evtchn_to_irq); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 881 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 882 | static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu) |
| 883 | { |
| 884 | struct evtchn_bind_ipi bind_ipi; |
| 885 | int evtchn, irq; |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 886 | int ret; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 887 | |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 888 | mutex_lock(&irq_mapping_update_lock); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 889 | |
| 890 | irq = per_cpu(ipi_to_irq, cpu)[ipi]; |
Ian Campbell | 90af951 | 2009-02-06 16:55:58 -0800 | [diff] [blame] | 891 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 892 | if (irq == -1) { |
Ian Campbell | c9df1ce | 2011-01-11 17:20:15 +0000 | [diff] [blame] | 893 | irq = xen_allocate_irq_dynamic(); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 894 | if (irq < 0) |
| 895 | goto out; |
| 896 | |
Thomas Gleixner | c442b80 | 2011-03-25 10:58:06 +0100 | [diff] [blame] | 897 | irq_set_chip_and_handler_name(irq, &xen_percpu_chip, |
Jeremy Fitzhardinge | aaca496 | 2010-08-20 18:57:53 -0700 | [diff] [blame] | 898 | handle_percpu_irq, "ipi"); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 899 | |
Vitaly Kuznetsov | 8058c0b | 2016-06-30 17:56:40 +0200 | [diff] [blame] | 900 | bind_ipi.vcpu = xen_vcpu_nr(cpu); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 901 | if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi, |
| 902 | &bind_ipi) != 0) |
| 903 | BUG(); |
| 904 | evtchn = bind_ipi.port; |
| 905 | |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 906 | ret = xen_irq_info_ipi_setup(cpu, irq, evtchn, ipi); |
| 907 | if (ret < 0) { |
| 908 | __unbind_from_irq(irq); |
| 909 | irq = ret; |
| 910 | goto out; |
| 911 | } |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 912 | bind_evtchn_to_cpu(evtchn, cpu); |
Konrad Rzeszutek Wilk | 5e152e6 | 2012-05-23 13:28:44 -0400 | [diff] [blame] | 913 | } else { |
| 914 | struct irq_info *info = info_for_irq(irq); |
| 915 | WARN_ON(info == NULL || info->type != IRQT_IPI); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 916 | } |
| 917 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 918 | out: |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 919 | mutex_unlock(&irq_mapping_update_lock); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 920 | return irq; |
| 921 | } |
| 922 | |
Juergen Gross | 854072d | 2014-08-28 06:44:09 +0200 | [diff] [blame] | 923 | int bind_interdomain_evtchn_to_irq(unsigned int remote_domain, |
| 924 | unsigned int remote_port) |
Ian Campbell | 2e820f5 | 2009-02-09 12:05:50 -0800 | [diff] [blame] | 925 | { |
| 926 | struct evtchn_bind_interdomain bind_interdomain; |
| 927 | int err; |
| 928 | |
| 929 | bind_interdomain.remote_dom = remote_domain; |
| 930 | bind_interdomain.remote_port = remote_port; |
| 931 | |
| 932 | err = HYPERVISOR_event_channel_op(EVTCHNOP_bind_interdomain, |
| 933 | &bind_interdomain); |
| 934 | |
| 935 | return err ? : bind_evtchn_to_irq(bind_interdomain.local_port); |
| 936 | } |
Juergen Gross | 854072d | 2014-08-28 06:44:09 +0200 | [diff] [blame] | 937 | EXPORT_SYMBOL_GPL(bind_interdomain_evtchn_to_irq); |
Ian Campbell | 2e820f5 | 2009-02-09 12:05:50 -0800 | [diff] [blame] | 938 | |
Olaf Hering | 62cc5fc | 2011-08-25 18:30:48 +0200 | [diff] [blame] | 939 | static int find_virq(unsigned int virq, unsigned int cpu) |
| 940 | { |
| 941 | struct evtchn_status status; |
| 942 | int port, rc = -ENOENT; |
| 943 | |
| 944 | memset(&status, 0, sizeof(status)); |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 945 | for (port = 0; port < xen_evtchn_max_channels(); port++) { |
Olaf Hering | 62cc5fc | 2011-08-25 18:30:48 +0200 | [diff] [blame] | 946 | status.dom = DOMID_SELF; |
| 947 | status.port = port; |
| 948 | rc = HYPERVISOR_event_channel_op(EVTCHNOP_status, &status); |
| 949 | if (rc < 0) |
| 950 | continue; |
| 951 | if (status.status != EVTCHNSTAT_virq) |
| 952 | continue; |
Vitaly Kuznetsov | b36585a | 2016-11-23 13:38:45 +0100 | [diff] [blame] | 953 | if (status.u.virq == virq && status.vcpu == xen_vcpu_nr(cpu)) { |
Olaf Hering | 62cc5fc | 2011-08-25 18:30:48 +0200 | [diff] [blame] | 954 | rc = port; |
| 955 | break; |
| 956 | } |
| 957 | } |
| 958 | return rc; |
| 959 | } |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 960 | |
David Vrabel | 0dc0064 | 2013-09-23 21:03:38 +0100 | [diff] [blame] | 961 | /** |
| 962 | * xen_evtchn_nr_channels - number of usable event channel ports |
| 963 | * |
| 964 | * This may be less than the maximum supported by the current |
| 965 | * hypervisor ABI. Use xen_evtchn_max_channels() for the maximum |
| 966 | * supported. |
| 967 | */ |
| 968 | unsigned xen_evtchn_nr_channels(void) |
| 969 | { |
| 970 | return evtchn_ops->nr_channels(); |
| 971 | } |
| 972 | EXPORT_SYMBOL_GPL(xen_evtchn_nr_channels); |
| 973 | |
David Vrabel | 77bb3df | 2015-05-19 18:40:49 +0100 | [diff] [blame] | 974 | 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] | 975 | { |
| 976 | struct evtchn_bind_virq bind_virq; |
Olaf Hering | 62cc5fc | 2011-08-25 18:30:48 +0200 | [diff] [blame] | 977 | int evtchn, irq, ret; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 978 | |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 979 | mutex_lock(&irq_mapping_update_lock); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 980 | |
| 981 | irq = per_cpu(virq_to_irq, cpu)[virq]; |
| 982 | |
| 983 | if (irq == -1) { |
Ian Campbell | c9df1ce | 2011-01-11 17:20:15 +0000 | [diff] [blame] | 984 | irq = xen_allocate_irq_dynamic(); |
Wei Liu | 68ba45f | 2013-01-31 14:46:56 +0000 | [diff] [blame] | 985 | if (irq < 0) |
Ian Campbell | 7bee976 | 2011-03-10 16:08:15 +0000 | [diff] [blame] | 986 | goto out; |
Jeremy Fitzhardinge | a52521f | 2010-09-22 15:28:52 -0700 | [diff] [blame] | 987 | |
David Vrabel | 77bb3df | 2015-05-19 18:40:49 +0100 | [diff] [blame] | 988 | if (percpu) |
| 989 | irq_set_chip_and_handler_name(irq, &xen_percpu_chip, |
| 990 | handle_percpu_irq, "virq"); |
| 991 | else |
| 992 | irq_set_chip_and_handler_name(irq, &xen_dynamic_chip, |
| 993 | handle_edge_irq, "virq"); |
Jeremy Fitzhardinge | a52521f | 2010-09-22 15:28:52 -0700 | [diff] [blame] | 994 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 995 | bind_virq.virq = virq; |
Vitaly Kuznetsov | 8058c0b | 2016-06-30 17:56:40 +0200 | [diff] [blame] | 996 | bind_virq.vcpu = xen_vcpu_nr(cpu); |
Olaf Hering | 62cc5fc | 2011-08-25 18:30:48 +0200 | [diff] [blame] | 997 | ret = HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq, |
| 998 | &bind_virq); |
| 999 | if (ret == 0) |
| 1000 | evtchn = bind_virq.port; |
| 1001 | else { |
| 1002 | if (ret == -EEXIST) |
| 1003 | ret = find_virq(virq, cpu); |
| 1004 | BUG_ON(ret < 0); |
| 1005 | evtchn = ret; |
| 1006 | } |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1007 | |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 1008 | ret = xen_irq_info_virq_setup(cpu, irq, evtchn, virq); |
| 1009 | if (ret < 0) { |
| 1010 | __unbind_from_irq(irq); |
| 1011 | irq = ret; |
| 1012 | goto out; |
| 1013 | } |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1014 | |
| 1015 | bind_evtchn_to_cpu(evtchn, cpu); |
Konrad Rzeszutek Wilk | 5e152e6 | 2012-05-23 13:28:44 -0400 | [diff] [blame] | 1016 | } else { |
| 1017 | struct irq_info *info = info_for_irq(irq); |
| 1018 | WARN_ON(info == NULL || info->type != IRQT_VIRQ); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1019 | } |
| 1020 | |
Ian Campbell | 7bee976 | 2011-03-10 16:08:15 +0000 | [diff] [blame] | 1021 | out: |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 1022 | mutex_unlock(&irq_mapping_update_lock); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1023 | |
| 1024 | return irq; |
| 1025 | } |
| 1026 | |
| 1027 | static void unbind_from_irq(unsigned int irq) |
| 1028 | { |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 1029 | mutex_lock(&irq_mapping_update_lock); |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 1030 | __unbind_from_irq(irq); |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 1031 | mutex_unlock(&irq_mapping_update_lock); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1032 | } |
| 1033 | |
| 1034 | int bind_evtchn_to_irqhandler(unsigned int evtchn, |
Jeff Garzik | 7c23997 | 2007-10-19 03:12:20 -0400 | [diff] [blame] | 1035 | irq_handler_t handler, |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1036 | unsigned long irqflags, |
| 1037 | const char *devname, void *dev_id) |
| 1038 | { |
Nicolas Kaiser | 361ae8c | 2011-03-30 21:14:26 +0200 | [diff] [blame] | 1039 | int irq, retval; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1040 | |
| 1041 | irq = bind_evtchn_to_irq(evtchn); |
Ian Campbell | 7bee976 | 2011-03-10 16:08:15 +0000 | [diff] [blame] | 1042 | if (irq < 0) |
| 1043 | return irq; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1044 | retval = request_irq(irq, handler, irqflags, devname, dev_id); |
| 1045 | if (retval != 0) { |
| 1046 | unbind_from_irq(irq); |
| 1047 | return retval; |
| 1048 | } |
| 1049 | |
| 1050 | return irq; |
| 1051 | } |
| 1052 | EXPORT_SYMBOL_GPL(bind_evtchn_to_irqhandler); |
| 1053 | |
Ian Campbell | 2e820f5 | 2009-02-09 12:05:50 -0800 | [diff] [blame] | 1054 | int bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain, |
| 1055 | unsigned int remote_port, |
| 1056 | irq_handler_t handler, |
| 1057 | unsigned long irqflags, |
| 1058 | const char *devname, |
| 1059 | void *dev_id) |
| 1060 | { |
| 1061 | int irq, retval; |
| 1062 | |
| 1063 | irq = bind_interdomain_evtchn_to_irq(remote_domain, remote_port); |
| 1064 | if (irq < 0) |
| 1065 | return irq; |
| 1066 | |
| 1067 | retval = request_irq(irq, handler, irqflags, devname, dev_id); |
| 1068 | if (retval != 0) { |
| 1069 | unbind_from_irq(irq); |
| 1070 | return retval; |
| 1071 | } |
| 1072 | |
| 1073 | return irq; |
| 1074 | } |
| 1075 | EXPORT_SYMBOL_GPL(bind_interdomain_evtchn_to_irqhandler); |
| 1076 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1077 | int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu, |
Jeff Garzik | 7c23997 | 2007-10-19 03:12:20 -0400 | [diff] [blame] | 1078 | irq_handler_t handler, |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1079 | unsigned long irqflags, const char *devname, void *dev_id) |
| 1080 | { |
Nicolas Kaiser | 361ae8c | 2011-03-30 21:14:26 +0200 | [diff] [blame] | 1081 | int irq, retval; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1082 | |
David Vrabel | 77bb3df | 2015-05-19 18:40:49 +0100 | [diff] [blame] | 1083 | irq = bind_virq_to_irq(virq, cpu, irqflags & IRQF_PERCPU); |
Ian Campbell | 7bee976 | 2011-03-10 16:08:15 +0000 | [diff] [blame] | 1084 | if (irq < 0) |
| 1085 | return irq; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1086 | retval = request_irq(irq, handler, irqflags, devname, dev_id); |
| 1087 | if (retval != 0) { |
| 1088 | unbind_from_irq(irq); |
| 1089 | return retval; |
| 1090 | } |
| 1091 | |
| 1092 | return irq; |
| 1093 | } |
| 1094 | EXPORT_SYMBOL_GPL(bind_virq_to_irqhandler); |
| 1095 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1096 | int bind_ipi_to_irqhandler(enum ipi_vector ipi, |
| 1097 | unsigned int cpu, |
| 1098 | irq_handler_t handler, |
| 1099 | unsigned long irqflags, |
| 1100 | const char *devname, |
| 1101 | void *dev_id) |
| 1102 | { |
| 1103 | int irq, retval; |
| 1104 | |
| 1105 | irq = bind_ipi_to_irq(ipi, cpu); |
| 1106 | if (irq < 0) |
| 1107 | return irq; |
| 1108 | |
Ian Campbell | 9bab0b7 | 2011-10-03 15:37:00 +0100 | [diff] [blame] | 1109 | irqflags |= IRQF_NO_SUSPEND | IRQF_FORCE_RESUME | IRQF_EARLY_RESUME; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1110 | retval = request_irq(irq, handler, irqflags, devname, dev_id); |
| 1111 | if (retval != 0) { |
| 1112 | unbind_from_irq(irq); |
| 1113 | return retval; |
| 1114 | } |
| 1115 | |
| 1116 | return irq; |
| 1117 | } |
| 1118 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1119 | void unbind_from_irqhandler(unsigned int irq, void *dev_id) |
| 1120 | { |
Juergen Gross | 82856cd | 2020-09-30 11:16:14 +0200 | [diff] [blame^] | 1121 | struct irq_info *info = info_for_irq(irq); |
Konrad Rzeszutek Wilk | 94032c5 | 2013-04-16 10:55:18 -0400 | [diff] [blame] | 1122 | |
| 1123 | if (WARN_ON(!info)) |
| 1124 | return; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1125 | free_irq(irq, dev_id); |
| 1126 | unbind_from_irq(irq); |
| 1127 | } |
| 1128 | EXPORT_SYMBOL_GPL(unbind_from_irqhandler); |
| 1129 | |
David Vrabel | 6ccecb0 | 2013-09-23 12:47:26 +0100 | [diff] [blame] | 1130 | /** |
| 1131 | * xen_set_irq_priority() - set an event channel priority. |
| 1132 | * @irq:irq bound to an event channel. |
| 1133 | * @priority: priority between XEN_IRQ_PRIORITY_MAX and XEN_IRQ_PRIORITY_MIN. |
| 1134 | */ |
| 1135 | int xen_set_irq_priority(unsigned irq, unsigned priority) |
| 1136 | { |
| 1137 | struct evtchn_set_priority set_priority; |
| 1138 | |
| 1139 | set_priority.port = evtchn_from_irq(irq); |
| 1140 | set_priority.priority = priority; |
| 1141 | |
| 1142 | return HYPERVISOR_event_channel_op(EVTCHNOP_set_priority, |
| 1143 | &set_priority); |
| 1144 | } |
| 1145 | EXPORT_SYMBOL_GPL(xen_set_irq_priority); |
| 1146 | |
Daniel De Graaf | 420eb55 | 2011-10-27 17:58:47 -0400 | [diff] [blame] | 1147 | int evtchn_make_refcounted(unsigned int evtchn) |
| 1148 | { |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 1149 | int irq = get_evtchn_to_irq(evtchn); |
Daniel De Graaf | 420eb55 | 2011-10-27 17:58:47 -0400 | [diff] [blame] | 1150 | struct irq_info *info; |
| 1151 | |
| 1152 | if (irq == -1) |
| 1153 | return -ENOENT; |
| 1154 | |
Juergen Gross | 82856cd | 2020-09-30 11:16:14 +0200 | [diff] [blame^] | 1155 | info = info_for_irq(irq); |
Daniel De Graaf | 420eb55 | 2011-10-27 17:58:47 -0400 | [diff] [blame] | 1156 | |
| 1157 | if (!info) |
| 1158 | return -ENOENT; |
| 1159 | |
| 1160 | WARN_ON(info->refcnt != -1); |
| 1161 | |
| 1162 | info->refcnt = 1; |
| 1163 | |
| 1164 | return 0; |
| 1165 | } |
| 1166 | EXPORT_SYMBOL_GPL(evtchn_make_refcounted); |
| 1167 | |
| 1168 | int evtchn_get(unsigned int evtchn) |
| 1169 | { |
| 1170 | int irq; |
| 1171 | struct irq_info *info; |
| 1172 | int err = -ENOENT; |
| 1173 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 1174 | if (evtchn >= xen_evtchn_max_channels()) |
Daniel De Graaf | c3b3f16 | 2011-11-28 11:49:09 -0500 | [diff] [blame] | 1175 | return -EINVAL; |
| 1176 | |
Daniel De Graaf | 420eb55 | 2011-10-27 17:58:47 -0400 | [diff] [blame] | 1177 | mutex_lock(&irq_mapping_update_lock); |
| 1178 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 1179 | irq = get_evtchn_to_irq(evtchn); |
Daniel De Graaf | 420eb55 | 2011-10-27 17:58:47 -0400 | [diff] [blame] | 1180 | if (irq == -1) |
| 1181 | goto done; |
| 1182 | |
Juergen Gross | 82856cd | 2020-09-30 11:16:14 +0200 | [diff] [blame^] | 1183 | info = info_for_irq(irq); |
Daniel De Graaf | 420eb55 | 2011-10-27 17:58:47 -0400 | [diff] [blame] | 1184 | |
| 1185 | if (!info) |
| 1186 | goto done; |
| 1187 | |
| 1188 | err = -EINVAL; |
| 1189 | if (info->refcnt <= 0) |
| 1190 | goto done; |
| 1191 | |
| 1192 | info->refcnt++; |
| 1193 | err = 0; |
| 1194 | done: |
| 1195 | mutex_unlock(&irq_mapping_update_lock); |
| 1196 | |
| 1197 | return err; |
| 1198 | } |
| 1199 | EXPORT_SYMBOL_GPL(evtchn_get); |
| 1200 | |
| 1201 | void evtchn_put(unsigned int evtchn) |
| 1202 | { |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 1203 | int irq = get_evtchn_to_irq(evtchn); |
Daniel De Graaf | 420eb55 | 2011-10-27 17:58:47 -0400 | [diff] [blame] | 1204 | if (WARN_ON(irq == -1)) |
| 1205 | return; |
| 1206 | unbind_from_irq(irq); |
| 1207 | } |
| 1208 | EXPORT_SYMBOL_GPL(evtchn_put); |
| 1209 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1210 | void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector) |
| 1211 | { |
Konrad Rzeszutek Wilk | 6efa20e | 2013-07-19 11:51:31 -0400 | [diff] [blame] | 1212 | int irq; |
| 1213 | |
Stefano Stabellini | 072b206 | 2013-08-13 16:57:06 +0000 | [diff] [blame] | 1214 | #ifdef CONFIG_X86 |
Konrad Rzeszutek Wilk | 6efa20e | 2013-07-19 11:51:31 -0400 | [diff] [blame] | 1215 | if (unlikely(vector == XEN_NMI_VECTOR)) { |
Vitaly Kuznetsov | ad5475f | 2016-06-30 17:56:38 +0200 | [diff] [blame] | 1216 | int rc = HYPERVISOR_vcpu_op(VCPUOP_send_nmi, xen_vcpu_nr(cpu), |
| 1217 | NULL); |
Konrad Rzeszutek Wilk | 6efa20e | 2013-07-19 11:51:31 -0400 | [diff] [blame] | 1218 | if (rc < 0) |
| 1219 | printk(KERN_WARNING "Sending nmi to CPU%d failed (rc:%d)\n", cpu, rc); |
| 1220 | return; |
| 1221 | } |
Stefano Stabellini | 072b206 | 2013-08-13 16:57:06 +0000 | [diff] [blame] | 1222 | #endif |
Konrad Rzeszutek Wilk | 6efa20e | 2013-07-19 11:51:31 -0400 | [diff] [blame] | 1223 | irq = per_cpu(ipi_to_irq, cpu)[vector]; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1224 | BUG_ON(irq < 0); |
| 1225 | notify_remote_via_irq(irq); |
| 1226 | } |
| 1227 | |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 1228 | static DEFINE_PER_CPU(unsigned, xed_nesting_count); |
| 1229 | |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1230 | static void __xen_evtchn_do_upcall(void) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1231 | { |
Christoph Lameter | 780f36d | 2010-12-06 11:16:29 -0600 | [diff] [blame] | 1232 | struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu); |
David Vrabel | 9a489f4 | 2013-03-13 15:29:25 +0000 | [diff] [blame] | 1233 | int cpu = get_cpu(); |
Ruslan Pisarev | 088c05a | 2011-07-26 14:16:13 +0300 | [diff] [blame] | 1234 | unsigned count; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1235 | |
Jeremy Fitzhardinge | 229664b | 2008-03-17 16:37:20 -0700 | [diff] [blame] | 1236 | do { |
Jeremy Fitzhardinge | 229664b | 2008-03-17 16:37:20 -0700 | [diff] [blame] | 1237 | vcpu_info->evtchn_upcall_pending = 0; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1238 | |
Christoph Lameter | b2e4ae6 | 2010-12-06 11:40:07 -0600 | [diff] [blame] | 1239 | if (__this_cpu_inc_return(xed_nesting_count) - 1) |
Jeremy Fitzhardinge | 229664b | 2008-03-17 16:37:20 -0700 | [diff] [blame] | 1240 | goto out; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1241 | |
David Vrabel | 9a489f4 | 2013-03-13 15:29:25 +0000 | [diff] [blame] | 1242 | xen_evtchn_handle_events(cpu); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1243 | |
Jeremy Fitzhardinge | 229664b | 2008-03-17 16:37:20 -0700 | [diff] [blame] | 1244 | BUG_ON(!irqs_disabled()); |
| 1245 | |
Christoph Lameter | 780f36d | 2010-12-06 11:16:29 -0600 | [diff] [blame] | 1246 | count = __this_cpu_read(xed_nesting_count); |
| 1247 | __this_cpu_write(xed_nesting_count, 0); |
Stefano Stabellini | 183d03c | 2010-05-17 17:08:21 +0100 | [diff] [blame] | 1248 | } while (count != 1 || vcpu_info->evtchn_upcall_pending); |
Jeremy Fitzhardinge | 229664b | 2008-03-17 16:37:20 -0700 | [diff] [blame] | 1249 | |
| 1250 | out: |
Jeremy Fitzhardinge | 3445a8f | 2009-02-06 14:09:46 -0800 | [diff] [blame] | 1251 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1252 | put_cpu(); |
| 1253 | } |
| 1254 | |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1255 | void xen_evtchn_do_upcall(struct pt_regs *regs) |
| 1256 | { |
| 1257 | struct pt_regs *old_regs = set_irq_regs(regs); |
| 1258 | |
Mojiong Qiu | 772aebc | 2012-11-06 16:08:15 +0800 | [diff] [blame] | 1259 | irq_enter(); |
Stefano Stabellini | 0ec53ec | 2012-09-14 13:37:32 +0000 | [diff] [blame] | 1260 | #ifdef CONFIG_X86 |
Thomas Gleixner | 99c8b79 | 2014-02-23 21:40:21 +0000 | [diff] [blame] | 1261 | inc_irq_stat(irq_hv_callback_count); |
Arnd Bergmann | d06eb3e | 2014-03-25 16:52:25 +0100 | [diff] [blame] | 1262 | #endif |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1263 | |
| 1264 | __xen_evtchn_do_upcall(); |
| 1265 | |
| 1266 | irq_exit(); |
| 1267 | set_irq_regs(old_regs); |
| 1268 | } |
| 1269 | |
| 1270 | void xen_hvm_evtchn_do_upcall(void) |
| 1271 | { |
| 1272 | __xen_evtchn_do_upcall(); |
| 1273 | } |
Stefano Stabellini | 183d03c | 2010-05-17 17:08:21 +0100 | [diff] [blame] | 1274 | EXPORT_SYMBOL_GPL(xen_hvm_evtchn_do_upcall); |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1275 | |
Jeremy Fitzhardinge | eb1e305 | 2008-05-26 23:31:23 +0100 | [diff] [blame] | 1276 | /* Rebind a new event channel to an existing irq. */ |
| 1277 | void rebind_evtchn_irq(int evtchn, int irq) |
| 1278 | { |
Jeremy Fitzhardinge | d77bbd4 | 2009-02-06 14:09:45 -0800 | [diff] [blame] | 1279 | struct irq_info *info = info_for_irq(irq); |
| 1280 | |
Konrad Rzeszutek Wilk | 94032c5 | 2013-04-16 10:55:18 -0400 | [diff] [blame] | 1281 | if (WARN_ON(!info)) |
| 1282 | return; |
| 1283 | |
Jeremy Fitzhardinge | eb1e305 | 2008-05-26 23:31:23 +0100 | [diff] [blame] | 1284 | /* Make sure the irq is masked, since the new event channel |
| 1285 | will also be masked. */ |
| 1286 | disable_irq(irq); |
| 1287 | |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 1288 | mutex_lock(&irq_mapping_update_lock); |
Jeremy Fitzhardinge | eb1e305 | 2008-05-26 23:31:23 +0100 | [diff] [blame] | 1289 | |
| 1290 | /* After resume the irq<->evtchn mappings are all cleared out */ |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 1291 | BUG_ON(get_evtchn_to_irq(evtchn) != -1); |
Jeremy Fitzhardinge | eb1e305 | 2008-05-26 23:31:23 +0100 | [diff] [blame] | 1292 | /* Expect irq to have been bound before, |
Jeremy Fitzhardinge | d77bbd4 | 2009-02-06 14:09:45 -0800 | [diff] [blame] | 1293 | so there should be a proper type */ |
| 1294 | BUG_ON(info->type == IRQT_UNBOUND); |
Jeremy Fitzhardinge | eb1e305 | 2008-05-26 23:31:23 +0100 | [diff] [blame] | 1295 | |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 1296 | (void)xen_irq_info_evtchn_setup(irq, evtchn); |
Jeremy Fitzhardinge | eb1e305 | 2008-05-26 23:31:23 +0100 | [diff] [blame] | 1297 | |
Konrad Rzeszutek Wilk | 7736594 | 2011-09-14 05:10:00 -0400 | [diff] [blame] | 1298 | mutex_unlock(&irq_mapping_update_lock); |
Jeremy Fitzhardinge | eb1e305 | 2008-05-26 23:31:23 +0100 | [diff] [blame] | 1299 | |
Boris Ostrovsky | 5cec988 | 2015-04-29 17:10:12 -0400 | [diff] [blame] | 1300 | bind_evtchn_to_cpu(evtchn, info->cpu); |
| 1301 | /* This will be deferred until interrupt is processed */ |
| 1302 | irq_set_affinity(irq, cpumask_of(info->cpu)); |
Jeremy Fitzhardinge | eb1e305 | 2008-05-26 23:31:23 +0100 | [diff] [blame] | 1303 | |
| 1304 | /* Unmask the event channel. */ |
| 1305 | enable_irq(irq); |
| 1306 | } |
| 1307 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1308 | /* Rebind an evtchn so that it gets delivered to a specific cpu */ |
Juergen Gross | 007e5aa | 2019-06-21 20:47:03 +0200 | [diff] [blame] | 1309 | static int xen_rebind_evtchn_to_cpu(int evtchn, unsigned int tcpu) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1310 | { |
| 1311 | struct evtchn_bind_vcpu bind_vcpu; |
David Vrabel | 4704fe4 | 2013-08-15 13:21:07 +0100 | [diff] [blame] | 1312 | int masked; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1313 | |
Ian Campbell | be49472 | 2011-03-10 16:08:02 +0000 | [diff] [blame] | 1314 | if (!VALID_EVTCHN(evtchn)) |
| 1315 | return -1; |
| 1316 | |
Boris Ostrovsky | 84d582d | 2017-04-24 15:04:53 -0400 | [diff] [blame] | 1317 | if (!xen_support_evtchn_rebind()) |
| 1318 | return -1; |
| 1319 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1320 | /* Send future instances of this interrupt to other vcpu. */ |
| 1321 | bind_vcpu.port = evtchn; |
Vitaly Kuznetsov | 8058c0b | 2016-06-30 17:56:40 +0200 | [diff] [blame] | 1322 | bind_vcpu.vcpu = xen_vcpu_nr(tcpu); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1323 | |
| 1324 | /* |
David Vrabel | 4704fe4 | 2013-08-15 13:21:07 +0100 | [diff] [blame] | 1325 | * Mask the event while changing the VCPU binding to prevent |
| 1326 | * it being delivered on an unexpected VCPU. |
| 1327 | */ |
Wei Liu | 3f70fa8 | 2013-03-07 15:50:27 +0000 | [diff] [blame] | 1328 | masked = test_and_set_mask(evtchn); |
David Vrabel | 4704fe4 | 2013-08-15 13:21:07 +0100 | [diff] [blame] | 1329 | |
| 1330 | /* |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1331 | * If this fails, it usually just indicates that we're dealing with a |
| 1332 | * virq or IPI channel, which don't actually need to be rebound. Ignore |
| 1333 | * it, but don't do the xenlinux-level rebind in that case. |
| 1334 | */ |
| 1335 | if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_vcpu, &bind_vcpu) >= 0) |
| 1336 | bind_evtchn_to_cpu(evtchn, tcpu); |
Yinghai Lu | d5dedd4 | 2009-04-27 17:59:21 -0700 | [diff] [blame] | 1337 | |
David Vrabel | 4704fe4 | 2013-08-15 13:21:07 +0100 | [diff] [blame] | 1338 | if (!masked) |
| 1339 | unmask_evtchn(evtchn); |
| 1340 | |
Yinghai Lu | d5dedd4 | 2009-04-27 17:59:21 -0700 | [diff] [blame] | 1341 | return 0; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1342 | } |
| 1343 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1344 | static int set_affinity_irq(struct irq_data *data, const struct cpumask *dest, |
| 1345 | bool force) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1346 | { |
Thomas Gleixner | 753fbd2 | 2014-03-04 20:43:40 +0000 | [diff] [blame] | 1347 | unsigned tcpu = cpumask_first_and(dest, cpu_online_mask); |
Linus Torvalds | 6e6c5b9 | 2017-07-06 19:11:24 -0700 | [diff] [blame] | 1348 | 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] | 1349 | |
Thomas Gleixner | ef1c2cc | 2017-06-20 01:37:45 +0200 | [diff] [blame] | 1350 | if (!ret) |
| 1351 | irq_data_update_effective_affinity(data, cpumask_of(tcpu)); |
| 1352 | |
| 1353 | return ret; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1354 | } |
| 1355 | |
Juergen Gross | 007e5aa | 2019-06-21 20:47:03 +0200 | [diff] [blame] | 1356 | /* To be called with desc->lock held. */ |
| 1357 | int xen_set_affinity_evtchn(struct irq_desc *desc, unsigned int tcpu) |
| 1358 | { |
| 1359 | struct irq_data *d = irq_desc_get_irq_data(desc); |
| 1360 | |
| 1361 | return set_affinity_irq(d, cpumask_of(tcpu), false); |
| 1362 | } |
| 1363 | EXPORT_SYMBOL_GPL(xen_set_affinity_evtchn); |
| 1364 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1365 | static void enable_dynirq(struct irq_data *data) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1366 | { |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1367 | int evtchn = evtchn_from_irq(data->irq); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1368 | |
| 1369 | if (VALID_EVTCHN(evtchn)) |
| 1370 | unmask_evtchn(evtchn); |
| 1371 | } |
| 1372 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1373 | static void disable_dynirq(struct irq_data *data) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1374 | { |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1375 | int evtchn = evtchn_from_irq(data->irq); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1376 | |
| 1377 | if (VALID_EVTCHN(evtchn)) |
| 1378 | mask_evtchn(evtchn); |
| 1379 | } |
| 1380 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1381 | static void ack_dynirq(struct irq_data *data) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1382 | { |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1383 | int evtchn = evtchn_from_irq(data->irq); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1384 | |
Boris Ostrovsky | ff1e22e | 2016-03-18 10:11:07 -0400 | [diff] [blame] | 1385 | if (!VALID_EVTCHN(evtchn)) |
| 1386 | return; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1387 | |
Ross Lagerwall | f0f3938 | 2016-05-10 16:11:00 +0100 | [diff] [blame] | 1388 | if (unlikely(irqd_is_setaffinity_pending(data)) && |
| 1389 | likely(!irqd_irq_disabled(data))) { |
Boris Ostrovsky | ff1e22e | 2016-03-18 10:11:07 -0400 | [diff] [blame] | 1390 | int masked = test_and_set_mask(evtchn); |
| 1391 | |
| 1392 | clear_evtchn(evtchn); |
| 1393 | |
| 1394 | irq_move_masked_irq(data); |
| 1395 | |
| 1396 | if (!masked) |
| 1397 | unmask_evtchn(evtchn); |
| 1398 | } else |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 1399 | clear_evtchn(evtchn); |
| 1400 | } |
| 1401 | |
| 1402 | static void mask_ack_dynirq(struct irq_data *data) |
| 1403 | { |
| 1404 | disable_dynirq(data); |
| 1405 | ack_dynirq(data); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1406 | } |
| 1407 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1408 | static int retrigger_dynirq(struct irq_data *data) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1409 | { |
David Vrabel | 4640ddf | 2014-02-17 17:45:16 +0000 | [diff] [blame] | 1410 | unsigned int evtchn = evtchn_from_irq(data->irq); |
| 1411 | int masked; |
| 1412 | |
| 1413 | if (!VALID_EVTCHN(evtchn)) |
| 1414 | return 0; |
| 1415 | |
| 1416 | masked = test_and_set_mask(evtchn); |
| 1417 | set_evtchn(evtchn); |
| 1418 | if (!masked) |
| 1419 | unmask_evtchn(evtchn); |
| 1420 | |
| 1421 | return 1; |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1422 | } |
| 1423 | |
Ian Campbell | 0a85226 | 2011-03-10 16:08:06 +0000 | [diff] [blame] | 1424 | static void restore_pirqs(void) |
Stefano Stabellini | 9a069c3 | 2010-12-01 14:51:44 +0000 | [diff] [blame] | 1425 | { |
| 1426 | int pirq, rc, irq, gsi; |
| 1427 | struct physdev_map_pirq map_irq; |
Ian Campbell | 69c358c | 2011-03-10 16:08:13 +0000 | [diff] [blame] | 1428 | struct irq_info *info; |
Stefano Stabellini | 9a069c3 | 2010-12-01 14:51:44 +0000 | [diff] [blame] | 1429 | |
Ian Campbell | 69c358c | 2011-03-10 16:08:13 +0000 | [diff] [blame] | 1430 | list_for_each_entry(info, &xen_irq_list_head, list) { |
| 1431 | if (info->type != IRQT_PIRQ) |
Stefano Stabellini | 9a069c3 | 2010-12-01 14:51:44 +0000 | [diff] [blame] | 1432 | continue; |
| 1433 | |
Ian Campbell | 69c358c | 2011-03-10 16:08:13 +0000 | [diff] [blame] | 1434 | pirq = info->u.pirq.pirq; |
| 1435 | gsi = info->u.pirq.gsi; |
| 1436 | irq = info->irq; |
| 1437 | |
Stefano Stabellini | 9a069c3 | 2010-12-01 14:51:44 +0000 | [diff] [blame] | 1438 | /* save/restore of PT devices doesn't work, so at this point the |
| 1439 | * only devices present are GSI based emulated devices */ |
Stefano Stabellini | 9a069c3 | 2010-12-01 14:51:44 +0000 | [diff] [blame] | 1440 | if (!gsi) |
| 1441 | continue; |
| 1442 | |
| 1443 | map_irq.domid = DOMID_SELF; |
| 1444 | map_irq.type = MAP_PIRQ_TYPE_GSI; |
| 1445 | map_irq.index = gsi; |
| 1446 | map_irq.pirq = pirq; |
| 1447 | |
| 1448 | rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq); |
| 1449 | if (rc) { |
Joe Perches | 283c097 | 2013-06-28 03:21:41 -0700 | [diff] [blame] | 1450 | pr_warn("xen map irq failed gsi=%d irq=%d pirq=%d rc=%d\n", |
| 1451 | gsi, irq, pirq, rc); |
Ian Campbell | 9158c35 | 2011-03-10 16:08:09 +0000 | [diff] [blame] | 1452 | xen_free_irq(irq); |
Stefano Stabellini | 9a069c3 | 2010-12-01 14:51:44 +0000 | [diff] [blame] | 1453 | continue; |
| 1454 | } |
| 1455 | |
| 1456 | printk(KERN_DEBUG "xen: --> irq=%d, pirq=%d\n", irq, map_irq.pirq); |
| 1457 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1458 | __startup_pirq(irq); |
Stefano Stabellini | 9a069c3 | 2010-12-01 14:51:44 +0000 | [diff] [blame] | 1459 | } |
| 1460 | } |
| 1461 | |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1462 | static void restore_cpu_virqs(unsigned int cpu) |
| 1463 | { |
| 1464 | struct evtchn_bind_virq bind_virq; |
| 1465 | int virq, irq, evtchn; |
| 1466 | |
| 1467 | for (virq = 0; virq < NR_VIRQS; virq++) { |
| 1468 | if ((irq = per_cpu(virq_to_irq, cpu)[virq]) == -1) |
| 1469 | continue; |
| 1470 | |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 1471 | BUG_ON(virq_from_irq(irq) != virq); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1472 | |
| 1473 | /* Get a new binding from Xen. */ |
| 1474 | bind_virq.virq = virq; |
Vitaly Kuznetsov | 8058c0b | 2016-06-30 17:56:40 +0200 | [diff] [blame] | 1475 | bind_virq.vcpu = xen_vcpu_nr(cpu); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1476 | if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq, |
| 1477 | &bind_virq) != 0) |
| 1478 | BUG(); |
| 1479 | evtchn = bind_virq.port; |
| 1480 | |
| 1481 | /* Record the new mapping. */ |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 1482 | (void)xen_irq_info_virq_setup(cpu, irq, evtchn, virq); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1483 | bind_evtchn_to_cpu(evtchn, cpu); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1484 | } |
| 1485 | } |
| 1486 | |
| 1487 | static void restore_cpu_ipis(unsigned int cpu) |
| 1488 | { |
| 1489 | struct evtchn_bind_ipi bind_ipi; |
| 1490 | int ipi, irq, evtchn; |
| 1491 | |
| 1492 | for (ipi = 0; ipi < XEN_NR_IPIS; ipi++) { |
| 1493 | if ((irq = per_cpu(ipi_to_irq, cpu)[ipi]) == -1) |
| 1494 | continue; |
| 1495 | |
Jeremy Fitzhardinge | ced40d0 | 2009-02-06 14:09:44 -0800 | [diff] [blame] | 1496 | BUG_ON(ipi_from_irq(irq) != ipi); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1497 | |
| 1498 | /* Get a new binding from Xen. */ |
Vitaly Kuznetsov | 8058c0b | 2016-06-30 17:56:40 +0200 | [diff] [blame] | 1499 | bind_ipi.vcpu = xen_vcpu_nr(cpu); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1500 | if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi, |
| 1501 | &bind_ipi) != 0) |
| 1502 | BUG(); |
| 1503 | evtchn = bind_ipi.port; |
| 1504 | |
| 1505 | /* Record the new mapping. */ |
David Vrabel | 96d4c588 | 2013-03-18 15:50:17 +0000 | [diff] [blame] | 1506 | (void)xen_irq_info_ipi_setup(cpu, irq, evtchn, ipi); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1507 | bind_evtchn_to_cpu(evtchn, cpu); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1508 | } |
| 1509 | } |
| 1510 | |
Jeremy Fitzhardinge | 2d9e1e2 | 2008-07-07 12:07:53 -0700 | [diff] [blame] | 1511 | /* Clear an irq's pending state, in preparation for polling on it */ |
| 1512 | void xen_clear_irq_pending(int irq) |
| 1513 | { |
| 1514 | int evtchn = evtchn_from_irq(irq); |
| 1515 | |
| 1516 | if (VALID_EVTCHN(evtchn)) |
| 1517 | clear_evtchn(evtchn); |
| 1518 | } |
Konrad Rzeszutek Wilk | d9a8814 | 2009-11-05 16:33:09 -0500 | [diff] [blame] | 1519 | EXPORT_SYMBOL(xen_clear_irq_pending); |
Jeremy Fitzhardinge | 168d2f4 | 2008-08-20 17:02:18 -0700 | [diff] [blame] | 1520 | void xen_set_irq_pending(int irq) |
| 1521 | { |
| 1522 | int evtchn = evtchn_from_irq(irq); |
| 1523 | |
| 1524 | if (VALID_EVTCHN(evtchn)) |
| 1525 | set_evtchn(evtchn); |
| 1526 | } |
| 1527 | |
| 1528 | bool xen_test_irq_pending(int irq) |
| 1529 | { |
| 1530 | int evtchn = evtchn_from_irq(irq); |
| 1531 | bool ret = false; |
| 1532 | |
| 1533 | if (VALID_EVTCHN(evtchn)) |
| 1534 | ret = test_evtchn(evtchn); |
| 1535 | |
| 1536 | return ret; |
| 1537 | } |
| 1538 | |
Konrad Rzeszutek Wilk | d9a8814 | 2009-11-05 16:33:09 -0500 | [diff] [blame] | 1539 | /* Poll waiting for an irq to become pending with timeout. In the usual case, |
| 1540 | * the irq will be disabled so it won't deliver an interrupt. */ |
| 1541 | void xen_poll_irq_timeout(int irq, u64 timeout) |
Jeremy Fitzhardinge | 2d9e1e2 | 2008-07-07 12:07:53 -0700 | [diff] [blame] | 1542 | { |
| 1543 | evtchn_port_t evtchn = evtchn_from_irq(irq); |
| 1544 | |
| 1545 | if (VALID_EVTCHN(evtchn)) { |
| 1546 | struct sched_poll poll; |
| 1547 | |
| 1548 | poll.nr_ports = 1; |
Konrad Rzeszutek Wilk | d9a8814 | 2009-11-05 16:33:09 -0500 | [diff] [blame] | 1549 | poll.timeout = timeout; |
Isaku Yamahata | ff3c536 | 2008-10-14 17:50:44 -0700 | [diff] [blame] | 1550 | set_xen_guest_handle(poll.ports, &evtchn); |
Jeremy Fitzhardinge | 2d9e1e2 | 2008-07-07 12:07:53 -0700 | [diff] [blame] | 1551 | |
| 1552 | if (HYPERVISOR_sched_op(SCHEDOP_poll, &poll) != 0) |
| 1553 | BUG(); |
| 1554 | } |
| 1555 | } |
Konrad Rzeszutek Wilk | d9a8814 | 2009-11-05 16:33:09 -0500 | [diff] [blame] | 1556 | EXPORT_SYMBOL(xen_poll_irq_timeout); |
| 1557 | /* Poll waiting for an irq to become pending. In the usual case, the |
| 1558 | * irq will be disabled so it won't deliver an interrupt. */ |
| 1559 | void xen_poll_irq(int irq) |
| 1560 | { |
| 1561 | xen_poll_irq_timeout(irq, 0 /* no timeout */); |
| 1562 | } |
Jeremy Fitzhardinge | 2d9e1e2 | 2008-07-07 12:07:53 -0700 | [diff] [blame] | 1563 | |
Konrad Rzeszutek Wilk | c7c2c3a | 2010-11-08 14:26:36 -0500 | [diff] [blame] | 1564 | /* Check whether the IRQ line is shared with other guests. */ |
| 1565 | int xen_test_irq_shared(int irq) |
| 1566 | { |
| 1567 | struct irq_info *info = info_for_irq(irq); |
Konrad Rzeszutek Wilk | 94032c5 | 2013-04-16 10:55:18 -0400 | [diff] [blame] | 1568 | struct physdev_irq_status_query irq_status; |
| 1569 | |
| 1570 | if (WARN_ON(!info)) |
| 1571 | return -ENOENT; |
| 1572 | |
| 1573 | irq_status.irq = info->u.pirq.pirq; |
Konrad Rzeszutek Wilk | c7c2c3a | 2010-11-08 14:26:36 -0500 | [diff] [blame] | 1574 | |
| 1575 | if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status)) |
| 1576 | return 0; |
| 1577 | return !(irq_status.flags & XENIRQSTAT_shared); |
| 1578 | } |
| 1579 | EXPORT_SYMBOL_GPL(xen_test_irq_shared); |
| 1580 | |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1581 | void xen_irq_resume(void) |
| 1582 | { |
David Vrabel | fd21069 | 2013-09-05 18:11:38 +0100 | [diff] [blame] | 1583 | unsigned int cpu; |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 1584 | struct irq_info *info; |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1585 | |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1586 | /* New event-channel space is not 'live' yet. */ |
David Vrabel | 1fe5655 | 2013-03-15 13:02:35 +0000 | [diff] [blame] | 1587 | xen_evtchn_resume(); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1588 | |
| 1589 | /* No IRQ <-> event-channel mappings. */ |
Ian Campbell | 6cb6537 | 2011-03-10 16:08:11 +0000 | [diff] [blame] | 1590 | list_for_each_entry(info, &xen_irq_list_head, list) |
| 1591 | info->evtchn = 0; /* zap event-channel binding */ |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1592 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 1593 | clear_evtchn_to_irq_all(); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1594 | |
| 1595 | for_each_possible_cpu(cpu) { |
| 1596 | restore_cpu_virqs(cpu); |
| 1597 | restore_cpu_ipis(cpu); |
| 1598 | } |
Ian Campbell | 6903591 | 2010-11-01 16:30:09 +0000 | [diff] [blame] | 1599 | |
Ian Campbell | 0a85226 | 2011-03-10 16:08:06 +0000 | [diff] [blame] | 1600 | restore_pirqs(); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1601 | } |
| 1602 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1603 | static struct irq_chip xen_dynamic_chip __read_mostly = { |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1604 | .name = "xen-dyn", |
Jeremy Fitzhardinge | 54a353a | 2009-02-06 14:09:42 -0800 | [diff] [blame] | 1605 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1606 | .irq_disable = disable_dynirq, |
| 1607 | .irq_mask = disable_dynirq, |
| 1608 | .irq_unmask = enable_dynirq, |
Jeremy Fitzhardinge | 54a353a | 2009-02-06 14:09:42 -0800 | [diff] [blame] | 1609 | |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 1610 | .irq_ack = ack_dynirq, |
| 1611 | .irq_mask_ack = mask_ack_dynirq, |
| 1612 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1613 | .irq_set_affinity = set_affinity_irq, |
| 1614 | .irq_retrigger = retrigger_dynirq, |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1615 | }; |
| 1616 | |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 1617 | static struct irq_chip xen_pirq_chip __read_mostly = { |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1618 | .name = "xen-pirq", |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 1619 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1620 | .irq_startup = startup_pirq, |
| 1621 | .irq_shutdown = shutdown_pirq, |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1622 | .irq_enable = enable_pirq, |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1623 | .irq_disable = disable_pirq, |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 1624 | |
Stefano Stabellini | 7e186bd | 2011-05-06 12:27:50 +0100 | [diff] [blame] | 1625 | .irq_mask = disable_dynirq, |
| 1626 | .irq_unmask = enable_dynirq, |
| 1627 | |
| 1628 | .irq_ack = eoi_pirq, |
| 1629 | .irq_eoi = eoi_pirq, |
| 1630 | .irq_mask_ack = mask_ack_pirq, |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 1631 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1632 | .irq_set_affinity = set_affinity_irq, |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 1633 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1634 | .irq_retrigger = retrigger_dynirq, |
Jeremy Fitzhardinge | d46a78b | 2010-10-01 12:20:09 -0400 | [diff] [blame] | 1635 | }; |
| 1636 | |
Jeremy Fitzhardinge | aaca496 | 2010-08-20 18:57:53 -0700 | [diff] [blame] | 1637 | static struct irq_chip xen_percpu_chip __read_mostly = { |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1638 | .name = "xen-percpu", |
Jeremy Fitzhardinge | aaca496 | 2010-08-20 18:57:53 -0700 | [diff] [blame] | 1639 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1640 | .irq_disable = disable_dynirq, |
| 1641 | .irq_mask = disable_dynirq, |
| 1642 | .irq_unmask = enable_dynirq, |
Jeremy Fitzhardinge | aaca496 | 2010-08-20 18:57:53 -0700 | [diff] [blame] | 1643 | |
Thomas Gleixner | c9e265e | 2011-02-05 20:08:54 +0000 | [diff] [blame] | 1644 | .irq_ack = ack_dynirq, |
Jeremy Fitzhardinge | aaca496 | 2010-08-20 18:57:53 -0700 | [diff] [blame] | 1645 | }; |
| 1646 | |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1647 | int xen_set_callback_via(uint64_t via) |
| 1648 | { |
| 1649 | struct xen_hvm_param a; |
| 1650 | a.domid = DOMID_SELF; |
| 1651 | a.index = HVM_PARAM_CALLBACK_IRQ; |
| 1652 | a.value = via; |
| 1653 | return HYPERVISOR_hvm_op(HVMOP_set_param, &a); |
| 1654 | } |
| 1655 | EXPORT_SYMBOL_GPL(xen_set_callback_via); |
| 1656 | |
Stefano Stabellini | ca65f9f | 2010-07-29 14:37:48 +0100 | [diff] [blame] | 1657 | #ifdef CONFIG_XEN_PVHVM |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1658 | /* Vector callbacks are better than PCI interrupts to receive event |
| 1659 | * channel notifications because we can receive vector callbacks on any |
| 1660 | * vcpu and we don't need PCI support or APIC interactions. */ |
| 1661 | void xen_callback_vector(void) |
| 1662 | { |
| 1663 | int rc; |
| 1664 | uint64_t callback_via; |
KarimAllah Ahmed | 72a9b18 | 2016-08-26 23:55:36 +0200 | [diff] [blame] | 1665 | |
Boris Ostrovsky | 84d582d | 2017-04-24 15:04:53 -0400 | [diff] [blame] | 1666 | if (xen_have_vector_callback) { |
| 1667 | callback_via = HVM_CALLBACK_VECTOR(HYPERVISOR_CALLBACK_VECTOR); |
| 1668 | rc = xen_set_callback_via(callback_via); |
| 1669 | if (rc) { |
| 1670 | pr_err("Request for Xen HVM callback vector failed\n"); |
| 1671 | xen_have_vector_callback = 0; |
| 1672 | return; |
| 1673 | } |
Juergen Gross | 4432362 | 2019-01-14 13:44:13 +0100 | [diff] [blame] | 1674 | 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] | 1675 | alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, |
| 1676 | xen_hvm_callback_vector); |
Boris Ostrovsky | 84d582d | 2017-04-24 15:04:53 -0400 | [diff] [blame] | 1677 | } |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1678 | } |
Stefano Stabellini | ca65f9f | 2010-07-29 14:37:48 +0100 | [diff] [blame] | 1679 | #else |
| 1680 | void xen_callback_vector(void) {} |
| 1681 | #endif |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1682 | |
David Vrabel | 1fe5655 | 2013-03-15 13:02:35 +0000 | [diff] [blame] | 1683 | #undef MODULE_PARAM_PREFIX |
| 1684 | #define MODULE_PARAM_PREFIX "xen." |
| 1685 | |
| 1686 | static bool fifo_events = true; |
| 1687 | module_param(fifo_events, bool, 0); |
| 1688 | |
Stefano Stabellini | 2e3d886 | 2012-10-02 15:57:57 +0100 | [diff] [blame] | 1689 | void __init xen_init_IRQ(void) |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1690 | { |
David Vrabel | 1fe5655 | 2013-03-15 13:02:35 +0000 | [diff] [blame] | 1691 | int ret = -EINVAL; |
Juergen Gross | e91b2b1 | 2017-07-17 19:47:03 +0200 | [diff] [blame] | 1692 | unsigned int evtchn; |
David Vrabel | 1fe5655 | 2013-03-15 13:02:35 +0000 | [diff] [blame] | 1693 | |
| 1694 | if (fifo_events) |
| 1695 | ret = xen_evtchn_fifo_init(); |
| 1696 | if (ret < 0) |
| 1697 | xen_evtchn_2l_init(); |
David Vrabel | ab9a1cc | 2013-03-14 12:49:19 +0000 | [diff] [blame] | 1698 | |
David Vrabel | d0b075f | 2013-10-17 15:23:15 +0100 | [diff] [blame] | 1699 | evtchn_to_irq = kcalloc(EVTCHN_ROW(xen_evtchn_max_channels()), |
| 1700 | sizeof(*evtchn_to_irq), GFP_KERNEL); |
Konrad Rzeszutek Wilk | 9d093e2 | 2011-09-29 13:31:21 -0400 | [diff] [blame] | 1701 | BUG_ON(!evtchn_to_irq); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1702 | |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1703 | /* No event channels are 'live' right now. */ |
Juergen Gross | e91b2b1 | 2017-07-17 19:47:03 +0200 | [diff] [blame] | 1704 | for (evtchn = 0; evtchn < xen_evtchn_nr_channels(); evtchn++) |
| 1705 | mask_evtchn(evtchn); |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1706 | |
Stefano Stabellini | 9846ff1 | 2012-01-30 16:21:48 +0000 | [diff] [blame] | 1707 | pirq_needs_eoi = pirq_needs_eoi_flag; |
| 1708 | |
Stefano Stabellini | 0ec53ec | 2012-09-14 13:37:32 +0000 | [diff] [blame] | 1709 | #ifdef CONFIG_X86 |
Mukesh Rathor | 2771374 | 2013-12-11 15:36:51 -0500 | [diff] [blame] | 1710 | if (xen_pv_domain()) { |
| 1711 | irq_ctx_init(smp_processor_id()); |
| 1712 | if (xen_initial_domain()) |
| 1713 | pci_xen_initial_domain(); |
| 1714 | } |
| 1715 | if (xen_feature(XENFEAT_hvm_callback_vector)) |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1716 | xen_callback_vector(); |
Mukesh Rathor | 2771374 | 2013-12-11 15:36:51 -0500 | [diff] [blame] | 1717 | |
| 1718 | if (xen_hvm_domain()) { |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1719 | native_init_IRQ(); |
Stefano Stabellini | 3942b74 | 2010-06-24 17:50:18 +0100 | [diff] [blame] | 1720 | /* pci_xen_hvm_init must be called after native_init_IRQ so that |
| 1721 | * __acpi_register_gsi can point at the right function */ |
| 1722 | pci_xen_hvm_init(); |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1723 | } else { |
Stefano Stabellini | 0ec53ec | 2012-09-14 13:37:32 +0000 | [diff] [blame] | 1724 | int rc; |
Stefano Stabellini | 9846ff1 | 2012-01-30 16:21:48 +0000 | [diff] [blame] | 1725 | struct physdev_pirq_eoi_gmfn eoi_gmfn; |
| 1726 | |
Stefano Stabellini | 9846ff1 | 2012-01-30 16:21:48 +0000 | [diff] [blame] | 1727 | pirq_eoi_map = (void *)__get_free_page(GFP_KERNEL|__GFP_ZERO); |
Julien Grall | 0df4f26 | 2015-08-07 17:34:37 +0100 | [diff] [blame] | 1728 | eoi_gmfn.gmfn = virt_to_gfn(pirq_eoi_map); |
Stefano Stabellini | 9846ff1 | 2012-01-30 16:21:48 +0000 | [diff] [blame] | 1729 | rc = HYPERVISOR_physdev_op(PHYSDEVOP_pirq_eoi_gmfn_v2, &eoi_gmfn); |
| 1730 | if (rc != 0) { |
| 1731 | free_page((unsigned long) pirq_eoi_map); |
| 1732 | pirq_eoi_map = NULL; |
| 1733 | } else |
| 1734 | pirq_needs_eoi = pirq_check_eoi_map; |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1735 | } |
Stefano Stabellini | 0ec53ec | 2012-09-14 13:37:32 +0000 | [diff] [blame] | 1736 | #endif |
Jeremy Fitzhardinge | e46cdb6 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 1737 | } |