arch/x86/kernel/apic/msi.c

   1 /*
   2  * Support of MSI, HPET and DMAR interrupts.
   3  *
   4  * Copyright (C) 1997, 1998, 1999, 2000, 2009 Ingo Molnar, Hajnalka Szabo
   5  *      Moved from arch/x86/kernel/apic/io_apic.c.
   6  * Jiang Liu <jiang.liu@linux.intel.com>
   7  *      Convert to hierarchical irqdomain
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/mm.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/pci.h>
  16 #include <linux/dmar.h>
  17 #include <linux/hpet.h>
  18 #include <linux/msi.h>
  19 #include <asm/irqdomain.h>
  20 #include <asm/msidef.h>
  21 #include <asm/hpet.h>
  22 #include <asm/hw_irq.h>
  23 #include <asm/apic.h>
  24 #include <asm/irq_remapping.h>
  25
  26 static struct irq_domain *msi_default_domain;
  27
  28 static void irq_msi_compose_msg(struct irq_data *data, struct msi_msg *msg)
  29 {
  30         struct irq_cfg *cfg = irqd_cfg(data);
  31
  32         msg->address_hi = MSI_ADDR_BASE_HI;
  33
  34         if (x2apic_enabled())
  35                 msg->address_hi |= MSI_ADDR_EXT_DEST_ID(cfg->dest_apicid);
  36
  37         msg->address_lo =
  38                 MSI_ADDR_BASE_LO |
  39                 ((apic->irq_dest_mode == 0) ?
  40                         MSI_ADDR_DEST_MODE_PHYSICAL :
  41                         MSI_ADDR_DEST_MODE_LOGICAL) |
  42                 ((apic->irq_delivery_mode != dest_LowestPrio) ?
  43                         MSI_ADDR_REDIRECTION_CPU :
  44                         MSI_ADDR_REDIRECTION_LOWPRI) |
  45                 MSI_ADDR_DEST_ID(cfg->dest_apicid);
  46
  47         msg->data =
  48                 MSI_DATA_TRIGGER_EDGE |
  49                 MSI_DATA_LEVEL_ASSERT |
  50                 ((apic->irq_delivery_mode != dest_LowestPrio) ?
  51                         MSI_DATA_DELIVERY_FIXED :
  52                         MSI_DATA_DELIVERY_LOWPRI) |
  53                 MSI_DATA_VECTOR(cfg->vector);
  54 }
  55
  56 /*
  57  * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
  58  * which implement the MSI or MSI-X Capability Structure.
  59  */
  60 static struct irq_chip pci_msi_controller = {
  61         .name                   = "PCI-MSI",
  62         .irq_unmask             = pci_msi_unmask_irq,
  63         .irq_mask               = pci_msi_mask_irq,
  64         .irq_ack                = irq_chip_ack_parent,
  65         .irq_retrigger          = irq_chip_retrigger_hierarchy,
  66         .irq_compose_msi_msg    = irq_msi_compose_msg,
  67         .flags                  = IRQCHIP_SKIP_SET_WAKE,
  68 };
  69
  70 int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
  71 {
  72         struct irq_domain *domain;
  73         struct irq_alloc_info info;
  74
  75         init_irq_alloc_info(&info, NULL);
  76         info.type = X86_IRQ_ALLOC_TYPE_MSI;
  77         info.msi_dev = dev;
  78
  79         domain = irq_remapping_get_irq_domain(&info);
  80         if (domain == NULL)
  81                 domain = msi_default_domain;
  82         if (domain == NULL)
  83                 return -ENOSYS;
  84
  85         return pci_msi_domain_alloc_irqs(domain, dev, nvec, type);
  86 }
  87
  88 void native_teardown_msi_irq(unsigned int irq)
  89 {
  90         irq_domain_free_irqs(irq, 1);
  91 }
  92
  93 static irq_hw_number_t pci_msi_get_hwirq(struct msi_domain_info *info,
  94                                          msi_alloc_info_t *arg)
  95 {
  96         return arg->msi_hwirq;
  97 }
  98
  99 static int pci_msi_prepare(struct irq_domain *domain, struct device *dev,
 100                            int nvec, msi_alloc_info_t *arg)
 101 {
 102         struct pci_dev *pdev = to_pci_dev(dev);
 103         struct msi_desc *desc = first_pci_msi_entry(pdev);
 104
 105         init_irq_alloc_info(arg, NULL);
 106         arg->msi_dev = pdev;
 107         if (desc->msi_attrib.is_msix) {
 108                 arg->type = X86_IRQ_ALLOC_TYPE_MSIX;
 109         } else {
 110                 arg->type = X86_IRQ_ALLOC_TYPE_MSI;
 111                 arg->flags |= X86_IRQ_ALLOC_CONTIGUOUS_VECTORS;
 112         }
 113
 114         return 0;
 115 }
 116
 117 static void pci_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
 118 {
 119         arg->msi_hwirq = pci_msi_domain_calc_hwirq(arg->msi_dev, desc);
 120 }
 121
 122 static struct msi_domain_ops pci_msi_domain_ops = {
 123         .get_hwirq      = pci_msi_get_hwirq,
 124         .msi_prepare    = pci_msi_prepare,
 125         .set_desc       = pci_msi_set_desc,
 126 };
 127
 128 static struct msi_domain_info pci_msi_domain_info = {
 129         .flags          = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
 130                           MSI_FLAG_PCI_MSIX,
 131         .ops            = &pci_msi_domain_ops,
 132         .chip           = &pci_msi_controller,
 133         .handler        = handle_edge_irq,
 134         .handler_name   = "edge",
 135 };
 136
 137 void arch_init_msi_domain(struct irq_domain *parent)
 138 {
 139         if (disable_apic)
 140                 return;
 141
 142         msi_default_domain = pci_msi_create_irq_domain(NULL,
 143                                         &pci_msi_domain_info, parent);
 144         if (!msi_default_domain)
 145                 pr_warn("failed to initialize irqdomain for MSI/MSI-x.\n");
 146 }
 147
 148 #ifdef CONFIG_IRQ_REMAP
 149 static struct irq_chip pci_msi_ir_controller = {
 150         .name                   = "IR-PCI-MSI",
 151         .irq_unmask             = pci_msi_unmask_irq,
 152         .irq_mask               = pci_msi_mask_irq,
 153         .irq_ack                = irq_chip_ack_parent,
 154         .irq_retrigger          = irq_chip_retrigger_hierarchy,
 155         .flags                  = IRQCHIP_SKIP_SET_WAKE,
 156 };
 157
 158 static struct msi_domain_info pci_msi_ir_domain_info = {
 159         .flags          = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
 160                           MSI_FLAG_MULTI_PCI_MSI | MSI_FLAG_PCI_MSIX,
 161         .ops            = &pci_msi_domain_ops,
 162         .chip           = &pci_msi_ir_controller,
 163         .handler        = handle_edge_irq,
 164         .handler_name   = "edge",
 165 };
 166
 167 struct irq_domain *arch_create_msi_irq_domain(struct irq_domain *parent)
 168 {
 169         return pci_msi_create_irq_domain(NULL, &pci_msi_ir_domain_info, parent);
 170 }
 171 #endif
 172
 173 #ifdef CONFIG_DMAR_TABLE
 174 static void dmar_msi_write_msg(struct irq_data *data, struct msi_msg *msg)
 175 {
 176         dmar_msi_write(data->irq, msg);
 177 }
 178
 179 static struct irq_chip dmar_msi_controller = {
 180         .name                   = "DMAR-MSI",
 181         .irq_unmask             = dmar_msi_unmask,
 182         .irq_mask               = dmar_msi_mask,
 183         .irq_ack                = irq_chip_ack_parent,
 184         .irq_set_affinity       = msi_domain_set_affinity,
 185         .irq_retrigger          = irq_chip_retrigger_hierarchy,
 186         .irq_compose_msi_msg    = irq_msi_compose_msg,
 187         .irq_write_msi_msg      = dmar_msi_write_msg,
 188         .flags                  = IRQCHIP_SKIP_SET_WAKE,
 189 };
 190
 191 static irq_hw_number_t dmar_msi_get_hwirq(struct msi_domain_info *info,
 192                                           msi_alloc_info_t *arg)
 193 {
 194         return arg->dmar_id;
 195 }
 196
 197 static int dmar_msi_init(struct irq_domain *domain,
 198                          struct msi_domain_info *info, unsigned int virq,
 199                          irq_hw_number_t hwirq, msi_alloc_info_t *arg)
 200 {
 201         irq_domain_set_info(domain, virq, arg->dmar_id, info->chip, NULL,
 202                             handle_edge_irq, arg->dmar_data, "edge");
 203
 204         return 0;
 205 }
 206
 207 static struct msi_domain_ops dmar_msi_domain_ops = {
 208         .get_hwirq      = dmar_msi_get_hwirq,
 209         .msi_init       = dmar_msi_init,
 210 };
 211
 212 static struct msi_domain_info dmar_msi_domain_info = {
 213         .ops            = &dmar_msi_domain_ops,
 214         .chip           = &dmar_msi_controller,
 215 };
 216
 217 static struct irq_domain *dmar_get_irq_domain(void)
 218 {
 219         static struct irq_domain *dmar_domain;
 220         static DEFINE_MUTEX(dmar_lock);
 221
 222         mutex_lock(&dmar_lock);
 223         if (dmar_domain == NULL)
 224                 dmar_domain = msi_create_irq_domain(NULL, &dmar_msi_domain_info,
 225                                                     x86_vector_domain);
 226         mutex_unlock(&dmar_lock);
 227
 228         return dmar_domain;
 229 }
 230
 231 int dmar_alloc_hwirq(int id, int node, void *arg)
 232 {
 233         struct irq_domain *domain = dmar_get_irq_domain();
 234         struct irq_alloc_info info;
 235
 236         if (!domain)
 237                 return -1;
 238
 239         init_irq_alloc_info(&info, NULL);
 240         info.type = X86_IRQ_ALLOC_TYPE_DMAR;
 241         info.dmar_id = id;
 242         info.dmar_data = arg;
 243
 244         return irq_domain_alloc_irqs(domain, 1, node, &info);
 245 }
 246
 247 void dmar_free_hwirq(int irq)
 248 {
 249         irq_domain_free_irqs(irq, 1);
 250 }
 251 #endif
 252
 253 /*
 254  * MSI message composition
 255  */
 256 #ifdef CONFIG_HPET_TIMER
 257 static inline int hpet_dev_id(struct irq_domain *domain)
 258 {
 259         struct msi_domain_info *info = msi_get_domain_info(domain);
 260
 261         return (int)(long)info->data;
 262 }
 263
 264 static void hpet_msi_write_msg(struct irq_data *data, struct msi_msg *msg)
 265 {
 266         hpet_msi_write(data->handler_data, msg);
 267 }
 268
 269 static struct irq_chip hpet_msi_controller = {
 270         .name = "HPET-MSI",
 271         .irq_unmask = hpet_msi_unmask,
 272         .irq_mask = hpet_msi_mask,
 273         .irq_ack = irq_chip_ack_parent,
 274         .irq_set_affinity = msi_domain_set_affinity,
 275         .irq_retrigger = irq_chip_retrigger_hierarchy,
 276         .irq_compose_msi_msg = irq_msi_compose_msg,
 277         .irq_write_msi_msg = hpet_msi_write_msg,
 278         .flags = IRQCHIP_SKIP_SET_WAKE,
 279 };
 280
 281 static irq_hw_number_t hpet_msi_get_hwirq(struct msi_domain_info *info,
 282                                           msi_alloc_info_t *arg)
 283 {
 284         return arg->hpet_index;
 285 }
 286
 287 static int hpet_msi_init(struct irq_domain *domain,
 288                          struct msi_domain_info *info, unsigned int virq,
 289                          irq_hw_number_t hwirq, msi_alloc_info_t *arg)
 290 {
 291         irq_set_status_flags(virq, IRQ_MOVE_PCNTXT);
 292         irq_domain_set_info(domain, virq, arg->hpet_index, info->chip, NULL,
 293                             handle_edge_irq, arg->hpet_data, "edge");
 294
 295         return 0;
 296 }
 297
 298 static void hpet_msi_free(struct irq_domain *domain,
 299                           struct msi_domain_info *info, unsigned int virq)
 300 {
 301         irq_clear_status_flags(virq, IRQ_MOVE_PCNTXT);
 302 }
 303
 304 static struct msi_domain_ops hpet_msi_domain_ops = {
 305         .get_hwirq      = hpet_msi_get_hwirq,
 306         .msi_init       = hpet_msi_init,
 307         .msi_free       = hpet_msi_free,
 308 };
 309
 310 static struct msi_domain_info hpet_msi_domain_info = {
 311         .ops            = &hpet_msi_domain_ops,
 312         .chip           = &hpet_msi_controller,
 313 };
 314
 315 struct irq_domain *hpet_create_irq_domain(int hpet_id)
 316 {
 317         struct irq_domain *parent;
 318         struct irq_alloc_info info;
 319         struct msi_domain_info *domain_info;
 320
 321         if (x86_vector_domain == NULL)
 322                 return NULL;
 323
 324         domain_info = kzalloc(sizeof(*domain_info), GFP_KERNEL);
 325         if (!domain_info)
 326                 return NULL;
 327
 328         *domain_info = hpet_msi_domain_info;
 329         domain_info->data = (void *)(long)hpet_id;
 330
 331         init_irq_alloc_info(&info, NULL);
 332         info.type = X86_IRQ_ALLOC_TYPE_HPET;
 333         info.hpet_id = hpet_id;
 334         parent = irq_remapping_get_ir_irq_domain(&info);
 335         if (parent == NULL)
 336                 parent = x86_vector_domain;
 337         else
 338                 hpet_msi_controller.name = "IR-HPET-MSI";
 339
 340         return msi_create_irq_domain(NULL, domain_info, parent);
 341 }
 342
 343 int hpet_assign_irq(struct irq_domain *domain, struct hpet_dev *dev,
 344                     int dev_num)
 345 {
 346         struct irq_alloc_info info;
 347
 348         init_irq_alloc_info(&info, NULL);
 349         info.type = X86_IRQ_ALLOC_TYPE_HPET;
 350         info.hpet_data = dev;
 351         info.hpet_id = hpet_dev_id(domain);
 352         info.hpet_index = dev_num;
 353
 354         return irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, NULL);
 355 }
 356 #endif