2 * Xen PCI - handle PCI (INTx) and MSI infrastructure calls for PV, HVM and
3 * initial domain support. We also handle the DSDT _PRT callbacks for GSI's
4 * used in HVM and initial domain mode (PV does not parse ACPI, so it has no
5 * concept of GSIs). Under PV we hook under the pnbbios API for IRQs and
6 * 0xcf8 PCI configuration read/write.
8 * Author: Ryan Wilson <hap9@epoch.ncsc.mil>
9 * Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
10 * Stefano Stabellini <stefano.stabellini@eu.citrix.com>
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/pci.h>
15 #include <linux/acpi.h>
18 #include <asm/io_apic.h>
19 #include <asm/pci_x86.h>
21 #include <asm/xen/hypervisor.h>
23 #include <xen/features.h>
24 #include <xen/events.h>
25 #include <asm/xen/pci.h>
27 static int xen_pcifront_enable_irq(struct pci_dev *dev)
34 rc = pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &gsi);
36 dev_warn(&dev->dev, "Xen PCI: failed to read interrupt line: %d\n",
40 /* In PV DomU the Xen PCI backend puts the PIRQ in the interrupt line.*/
43 if (gsi < NR_IRQS_LEGACY)
46 rc = xen_bind_pirq_gsi_to_irq(gsi, pirq, share, "pcifront");
48 dev_warn(&dev->dev, "Xen PCI: failed to bind GSI%d (PIRQ%d) to IRQ: %d\n",
54 dev_info(&dev->dev, "Xen PCI mapped GSI%d to IRQ%d\n", gsi, dev->irq);
59 static int xen_register_pirq(u32 gsi, int gsi_override, int triggering,
62 int rc, pirq = -1, irq = -1;
63 struct physdev_map_pirq map_irq;
67 irq = xen_irq_from_gsi(gsi);
74 map_irq.domid = DOMID_SELF;
75 map_irq.type = MAP_PIRQ_TYPE_GSI;
79 rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
81 printk(KERN_WARNING "xen map irq failed %d\n", rc);
85 if (triggering == ACPI_EDGE_SENSITIVE) {
90 name = "ioapic-level";
93 if (gsi_override >= 0)
96 irq = xen_bind_pirq_gsi_to_irq(gsi, map_irq.pirq, shareable, name);
100 printk(KERN_DEBUG "xen: --> pirq=%d -> irq=%d (gsi=%d)\n", map_irq.pirq, irq, gsi);
105 static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
106 int trigger, int polarity)
108 if (!xen_hvm_domain())
111 return xen_register_pirq(gsi, -1 /* no GSI override */, trigger,
112 false /* no mapping of GSI to PIRQ */);
115 #ifdef CONFIG_XEN_DOM0
116 static int xen_register_gsi(u32 gsi, int gsi_override, int triggering, int polarity)
119 struct physdev_setup_gsi setup_gsi;
121 if (!xen_pv_domain())
124 printk(KERN_DEBUG "xen: registering gsi %u triggering %d polarity %d\n",
125 gsi, triggering, polarity);
127 irq = xen_register_pirq(gsi, gsi_override, triggering, true);
130 setup_gsi.triggering = (triggering == ACPI_EDGE_SENSITIVE ? 0 : 1);
131 setup_gsi.polarity = (polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
133 rc = HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi);
135 printk(KERN_INFO "Already setup the GSI :%d\n", gsi);
137 printk(KERN_ERR "Failed to setup GSI :%d, err_code:%d\n",
144 static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
145 int trigger, int polarity)
147 return xen_register_gsi(gsi, -1 /* no GSI override */, trigger, polarity);
152 #if defined(CONFIG_PCI_MSI)
153 #include <linux/msi.h>
154 #include <asm/msidef.h>
156 struct xen_pci_frontend_ops *xen_pci_frontend;
157 EXPORT_SYMBOL_GPL(xen_pci_frontend);
159 static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
162 struct msi_desc *msidesc;
165 if (type == PCI_CAP_ID_MSI && nvec > 1)
168 v = kzalloc(sizeof(int) * max(1, nvec), GFP_KERNEL);
172 if (type == PCI_CAP_ID_MSIX)
173 ret = xen_pci_frontend_enable_msix(dev, v, nvec);
175 ret = xen_pci_frontend_enable_msi(dev, v);
179 list_for_each_entry(msidesc, &dev->msi_list, list) {
180 irq = xen_bind_pirq_msi_to_irq(dev, msidesc, v[i],
181 (type == PCI_CAP_ID_MSI) ? nvec : 1,
182 (type == PCI_CAP_ID_MSIX) ?
196 dev_err(&dev->dev, "Xen PCI frontend has not registered MSI/MSI-X support!\n");
202 #define XEN_PIRQ_MSI_DATA (MSI_DATA_TRIGGER_EDGE | \
203 MSI_DATA_LEVEL_ASSERT | (3 << 8) | MSI_DATA_VECTOR(0))
205 static void xen_msi_compose_msg(struct pci_dev *pdev, unsigned int pirq,
208 /* We set vector == 0 to tell the hypervisor we don't care about it,
209 * but we want a pirq setup instead.
210 * We use the dest_id field to pass the pirq that we want. */
211 msg->address_hi = MSI_ADDR_BASE_HI | MSI_ADDR_EXT_DEST_ID(pirq);
214 MSI_ADDR_DEST_MODE_PHYSICAL |
215 MSI_ADDR_REDIRECTION_CPU |
216 MSI_ADDR_DEST_ID(pirq);
218 msg->data = XEN_PIRQ_MSI_DATA;
221 static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
224 struct msi_desc *msidesc;
227 if (type == PCI_CAP_ID_MSI && nvec > 1)
230 list_for_each_entry(msidesc, &dev->msi_list, list) {
231 __read_msi_msg(msidesc, &msg);
232 pirq = MSI_ADDR_EXT_DEST_ID(msg.address_hi) |
233 ((msg.address_lo >> MSI_ADDR_DEST_ID_SHIFT) & 0xff);
234 if (msg.data != XEN_PIRQ_MSI_DATA ||
235 xen_irq_from_pirq(pirq) < 0) {
236 pirq = xen_allocate_pirq_msi(dev, msidesc);
241 xen_msi_compose_msg(dev, pirq, &msg);
242 __write_msi_msg(msidesc, &msg);
243 dev_dbg(&dev->dev, "xen: msi bound to pirq=%d\n", pirq);
246 "xen: msi already bound to pirq=%d\n", pirq);
248 irq = xen_bind_pirq_msi_to_irq(dev, msidesc, pirq,
249 (type == PCI_CAP_ID_MSI) ? nvec : 1,
250 (type == PCI_CAP_ID_MSIX) ?
256 "xen: msi --> pirq=%d --> irq=%d\n", pirq, irq);
262 "Xen PCI frontend has not registered MSI/MSI-X support!\n");
266 #ifdef CONFIG_XEN_DOM0
267 static bool __read_mostly pci_seg_supported = true;
269 static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
272 struct msi_desc *msidesc;
274 list_for_each_entry(msidesc, &dev->msi_list, list) {
275 struct physdev_map_pirq map_irq;
278 domid = ret = xen_find_device_domain_owner(dev);
279 /* N.B. Casting int's -ENODEV to uint16_t results in 0xFFED,
280 * hence check ret value for < 0. */
284 memset(&map_irq, 0, sizeof(map_irq));
285 map_irq.domid = domid;
286 map_irq.type = MAP_PIRQ_TYPE_MSI_SEG;
289 map_irq.bus = dev->bus->number |
290 (pci_domain_nr(dev->bus) << 16);
291 map_irq.devfn = dev->devfn;
293 if (type == PCI_CAP_ID_MSI && nvec > 1) {
294 map_irq.type = MAP_PIRQ_TYPE_MULTI_MSI;
295 map_irq.entry_nr = nvec;
296 } else if (type == PCI_CAP_ID_MSIX) {
298 u32 table_offset, bir;
301 pci_read_config_dword(dev, pos + PCI_MSIX_TABLE,
303 bir = (u8)(table_offset & PCI_MSIX_TABLE_BIR);
305 map_irq.table_base = pci_resource_start(dev, bir);
306 map_irq.entry_nr = msidesc->msi_attrib.entry_nr;
310 if (pci_seg_supported)
311 ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq,
313 if (type == PCI_CAP_ID_MSI && nvec > 1 && ret) {
315 * If MAP_PIRQ_TYPE_MULTI_MSI is not available
316 * there's nothing else we can do in this case.
317 * Just set ret > 0 so driver can retry with
323 if (ret == -EINVAL && !pci_domain_nr(dev->bus)) {
324 map_irq.type = MAP_PIRQ_TYPE_MSI;
327 map_irq.bus = dev->bus->number;
328 ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq,
331 pci_seg_supported = false;
334 dev_warn(&dev->dev, "xen map irq failed %d for %d domain\n",
339 ret = xen_bind_pirq_msi_to_irq(dev, msidesc, map_irq.pirq,
340 (type == PCI_CAP_ID_MSI) ? nvec : 1,
341 (type == PCI_CAP_ID_MSIX) ? "msi-x" : "msi",
351 static void xen_initdom_restore_msi_irqs(struct pci_dev *dev)
355 if (pci_seg_supported) {
356 struct physdev_pci_device restore_ext;
358 restore_ext.seg = pci_domain_nr(dev->bus);
359 restore_ext.bus = dev->bus->number;
360 restore_ext.devfn = dev->devfn;
361 ret = HYPERVISOR_physdev_op(PHYSDEVOP_restore_msi_ext,
364 pci_seg_supported = false;
365 WARN(ret && ret != -ENOSYS, "restore_msi_ext -> %d\n", ret);
367 if (!pci_seg_supported) {
368 struct physdev_restore_msi restore;
370 restore.bus = dev->bus->number;
371 restore.devfn = dev->devfn;
372 ret = HYPERVISOR_physdev_op(PHYSDEVOP_restore_msi, &restore);
373 WARN(ret && ret != -ENOSYS, "restore_msi -> %d\n", ret);
378 static void xen_teardown_msi_irqs(struct pci_dev *dev)
380 struct msi_desc *msidesc;
382 msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
383 if (msidesc->msi_attrib.is_msix)
384 xen_pci_frontend_disable_msix(dev);
386 xen_pci_frontend_disable_msi(dev);
388 /* Free the IRQ's and the msidesc using the generic code. */
389 default_teardown_msi_irqs(dev);
392 static void xen_teardown_msi_irq(unsigned int irq)
394 xen_destroy_irq(irq);
396 static u32 xen_nop_msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag)
400 static u32 xen_nop_msix_mask_irq(struct msi_desc *desc, u32 flag)
406 int __init pci_xen_init(void)
408 if (!xen_pv_domain() || xen_initial_domain())
411 printk(KERN_INFO "PCI: setting up Xen PCI frontend stub\n");
413 pcibios_set_cache_line_size();
415 pcibios_enable_irq = xen_pcifront_enable_irq;
416 pcibios_disable_irq = NULL;
419 /* Keep ACPI out of the picture */
423 #ifdef CONFIG_PCI_MSI
424 x86_msi.setup_msi_irqs = xen_setup_msi_irqs;
425 x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
426 x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs;
427 x86_msi.msi_mask_irq = xen_nop_msi_mask_irq;
428 x86_msi.msix_mask_irq = xen_nop_msix_mask_irq;
433 int __init pci_xen_hvm_init(void)
435 if (!xen_have_vector_callback || !xen_feature(XENFEAT_hvm_pirqs))
440 * We don't want to change the actual ACPI delivery model,
441 * just how GSIs get registered.
443 __acpi_register_gsi = acpi_register_gsi_xen_hvm;
446 #ifdef CONFIG_PCI_MSI
447 x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs;
448 x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
453 #ifdef CONFIG_XEN_DOM0
454 static __init void xen_setup_acpi_sci(void)
457 int trigger, polarity;
458 int gsi = acpi_sci_override_gsi;
460 int gsi_override = -1;
465 rc = acpi_get_override_irq(gsi, &trigger, &polarity);
467 printk(KERN_WARNING "xen: acpi_get_override_irq failed for acpi"
468 " sci, rc=%d\n", rc);
471 trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
472 polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
474 printk(KERN_INFO "xen: sci override: global_irq=%d trigger=%d "
475 "polarity=%d\n", gsi, trigger, polarity);
477 /* Before we bind the GSI to a Linux IRQ, check whether
478 * we need to override it with bus_irq (IRQ) value. Usually for
479 * IRQs below IRQ_LEGACY_IRQ this holds IRQ == GSI, as so:
480 * ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 low level)
481 * but there are oddballs where the IRQ != GSI:
482 * ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 20 low level)
483 * which ends up being: gsi_to_irq[9] == 20
484 * (which is what acpi_gsi_to_irq ends up calling when starting the
485 * the ACPI interpreter and keels over since IRQ 9 has not been
486 * setup as we had setup IRQ 20 for it).
488 if (acpi_gsi_to_irq(gsi, &irq) == 0) {
489 /* Use the provided value if it's valid. */
494 gsi = xen_register_gsi(gsi, gsi_override, trigger, polarity);
495 printk(KERN_INFO "xen: acpi sci %d\n", gsi);
500 int __init pci_xen_initial_domain(void)
504 #ifdef CONFIG_PCI_MSI
505 x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs;
506 x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
507 x86_msi.restore_msi_irqs = xen_initdom_restore_msi_irqs;
508 x86_msi.msi_mask_irq = xen_nop_msi_mask_irq;
509 x86_msi.msix_mask_irq = xen_nop_msix_mask_irq;
511 xen_setup_acpi_sci();
512 __acpi_register_gsi = acpi_register_gsi_xen;
513 /* Pre-allocate legacy irqs */
514 for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
515 int trigger, polarity;
517 if (acpi_get_override_irq(irq, &trigger, &polarity) == -1)
520 xen_register_pirq(irq, -1 /* no GSI override */,
521 trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE,
522 true /* Map GSI to PIRQ */);
524 if (0 == nr_ioapics) {
525 for (irq = 0; irq < NR_IRQS_LEGACY; irq++)
526 xen_bind_pirq_gsi_to_irq(irq, irq, 0, "xt-pic");
531 struct xen_device_domain_owner {
534 struct list_head list;
537 static DEFINE_SPINLOCK(dev_domain_list_spinlock);
538 static struct list_head dev_domain_list = LIST_HEAD_INIT(dev_domain_list);
540 static struct xen_device_domain_owner *find_device(struct pci_dev *dev)
542 struct xen_device_domain_owner *owner;
544 list_for_each_entry(owner, &dev_domain_list, list) {
545 if (owner->dev == dev)
551 int xen_find_device_domain_owner(struct pci_dev *dev)
553 struct xen_device_domain_owner *owner;
554 int domain = -ENODEV;
556 spin_lock(&dev_domain_list_spinlock);
557 owner = find_device(dev);
559 domain = owner->domain;
560 spin_unlock(&dev_domain_list_spinlock);
563 EXPORT_SYMBOL_GPL(xen_find_device_domain_owner);
565 int xen_register_device_domain_owner(struct pci_dev *dev, uint16_t domain)
567 struct xen_device_domain_owner *owner;
569 owner = kzalloc(sizeof(struct xen_device_domain_owner), GFP_KERNEL);
573 spin_lock(&dev_domain_list_spinlock);
574 if (find_device(dev)) {
575 spin_unlock(&dev_domain_list_spinlock);
579 owner->domain = domain;
581 list_add_tail(&owner->list, &dev_domain_list);
582 spin_unlock(&dev_domain_list_spinlock);
585 EXPORT_SYMBOL_GPL(xen_register_device_domain_owner);
587 int xen_unregister_device_domain_owner(struct pci_dev *dev)
589 struct xen_device_domain_owner *owner;
591 spin_lock(&dev_domain_list_spinlock);
592 owner = find_device(dev);
594 spin_unlock(&dev_domain_list_spinlock);
597 list_del(&owner->list);
598 spin_unlock(&dev_domain_list_spinlock);
602 EXPORT_SYMBOL_GPL(xen_unregister_device_domain_owner);