2 * Xen PCI Frontend Stub - puts some "dummy" functions in to the Linux
3 * x86 PCI core to support the Xen PCI Frontend
5 * Author: Ryan Wilson <hap9@epoch.ncsc.mil>
7 #include <linux/module.h>
8 #include <linux/init.h>
10 #include <linux/acpi.h>
13 #include <asm/io_apic.h>
14 #include <asm/pci_x86.h>
16 #include <asm/xen/hypervisor.h>
18 #include <xen/features.h>
19 #include <xen/events.h>
20 #include <asm/xen/pci.h>
23 static int xen_hvm_register_pirq(u32 gsi, int triggering)
26 struct physdev_map_pirq map_irq;
30 if (!xen_hvm_domain())
33 map_irq.domid = DOMID_SELF;
34 map_irq.type = MAP_PIRQ_TYPE_GSI;
38 rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
40 printk(KERN_WARNING "xen map irq failed %d\n", rc);
44 if (triggering == ACPI_EDGE_SENSITIVE) {
49 name = "ioapic-level";
52 irq = xen_map_pirq_gsi(map_irq.pirq, gsi, shareable, name);
54 printk(KERN_DEBUG "xen: --> irq=%d, pirq=%d\n", irq, map_irq.pirq);
59 static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
60 int trigger, int polarity)
62 return xen_hvm_register_pirq(gsi, trigger);
66 #if defined(CONFIG_PCI_MSI)
67 #include <linux/msi.h>
68 #include <asm/msidef.h>
70 struct xen_pci_frontend_ops *xen_pci_frontend;
71 EXPORT_SYMBOL_GPL(xen_pci_frontend);
73 static void xen_msi_compose_msg(struct pci_dev *pdev, unsigned int pirq,
76 /* We set vector == 0 to tell the hypervisor we don't care about it,
77 * but we want a pirq setup instead.
78 * We use the dest_id field to pass the pirq that we want. */
79 msg->address_hi = MSI_ADDR_BASE_HI | MSI_ADDR_EXT_DEST_ID(pirq);
82 MSI_ADDR_DEST_MODE_PHYSICAL |
83 MSI_ADDR_REDIRECTION_CPU |
84 MSI_ADDR_DEST_ID(pirq);
87 MSI_DATA_TRIGGER_EDGE |
88 MSI_DATA_LEVEL_ASSERT |
89 /* delivery mode reserved */
94 static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
96 int irq, pirq, ret = 0;
97 struct msi_desc *msidesc;
100 list_for_each_entry(msidesc, &dev->msi_list, list) {
101 xen_allocate_pirq_msi((type == PCI_CAP_ID_MSIX) ?
102 "msi-x" : "msi", &irq, &pirq);
103 if (irq < 0 || pirq < 0)
105 printk(KERN_DEBUG "xen: msi --> irq=%d, pirq=%d\n", irq, pirq);
106 xen_msi_compose_msg(dev, pirq, &msg);
107 ret = set_irq_msi(irq, msidesc);
110 write_msi_msg(irq, &msg);
115 unbind_from_irqhandler(irq, NULL);
118 dev_err(&dev->dev, "Xen PCI frontend has not registered" \
119 " MSI/MSI-X support!\n");
125 * For MSI interrupts we have to use drivers/xen/event.s functions to
126 * allocate an irq_desc and setup the right */
129 static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
132 struct msi_desc *msidesc;
135 v = kzalloc(sizeof(int) * max(1, nvec), GFP_KERNEL);
139 if (type == PCI_CAP_ID_MSIX)
140 ret = xen_pci_frontend_enable_msix(dev, &v, nvec);
142 ret = xen_pci_frontend_enable_msi(dev, &v);
146 list_for_each_entry(msidesc, &dev->msi_list, list) {
147 irq = xen_allocate_pirq(v[i], 0, /* not sharable */
148 (type == PCI_CAP_ID_MSIX) ?
149 "pcifront-msi-x" : "pcifront-msi");
155 ret = set_irq_msi(irq, msidesc);
164 unbind_from_irqhandler(irq, NULL);
167 dev_err(&dev->dev, "Xen PCI frontend has not registered" \
168 " MSI/MSI-X support!\n");
174 static void xen_teardown_msi_irqs(struct pci_dev *dev)
176 struct msi_desc *msidesc;
178 msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
179 if (msidesc->msi_attrib.is_msix)
180 xen_pci_frontend_disable_msix(dev);
182 xen_pci_frontend_disable_msi(dev);
185 static void xen_teardown_msi_irq(unsigned int irq)
187 xen_destroy_irq(irq);
190 static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
193 struct msi_desc *msidesc;
195 list_for_each_entry(msidesc, &dev->msi_list, list) {
196 irq = xen_create_msi_irq(dev, msidesc, type);
200 ret = set_irq_msi(irq, msidesc);
207 xen_destroy_irq(irq);
212 static int xen_pcifront_enable_irq(struct pci_dev *dev)
217 dev_info(&dev->dev, "Xen PCI enabling IRQ: %d\n", dev->irq);
222 if (dev->irq < NR_IRQS_LEGACY)
225 rc = xen_allocate_pirq(dev->irq, share, "pcifront");
227 dev_warn(&dev->dev, "Xen PCI IRQ: %d, failed to register:%d\n",
234 int __init pci_xen_init(void)
236 if (!xen_pv_domain() || xen_initial_domain())
239 printk(KERN_INFO "PCI: setting up Xen PCI frontend stub\n");
241 pcibios_set_cache_line_size();
243 pcibios_enable_irq = xen_pcifront_enable_irq;
244 pcibios_disable_irq = NULL;
247 /* Keep ACPI out of the picture */
251 #ifdef CONFIG_PCI_MSI
252 x86_msi.setup_msi_irqs = xen_setup_msi_irqs;
253 x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
254 x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs;
259 int __init pci_xen_hvm_init(void)
261 if (!xen_feature(XENFEAT_hvm_pirqs))
266 * We don't want to change the actual ACPI delivery model,
267 * just how GSIs get registered.
269 __acpi_register_gsi = acpi_register_gsi_xen_hvm;
272 #ifdef CONFIG_PCI_MSI
273 x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs;
274 x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
279 #ifdef CONFIG_XEN_DOM0
280 static int xen_register_pirq(u32 gsi, int triggering)
283 struct physdev_map_pirq map_irq;
287 if (!xen_pv_domain())
290 if (triggering == ACPI_EDGE_SENSITIVE) {
292 name = "ioapic-edge";
295 name = "ioapic-level";
298 irq = xen_allocate_pirq(gsi, shareable, name);
300 printk(KERN_DEBUG "xen: --> irq=%d\n", irq);
305 map_irq.domid = DOMID_SELF;
306 map_irq.type = MAP_PIRQ_TYPE_GSI;
310 rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
312 printk(KERN_WARNING "xen map irq failed %d\n", rc);
320 static int xen_register_gsi(u32 gsi, int triggering, int polarity)
323 struct physdev_setup_gsi setup_gsi;
325 if (!xen_pv_domain())
328 printk(KERN_DEBUG "xen: registering gsi %u triggering %d polarity %d\n",
329 gsi, triggering, polarity);
331 irq = xen_register_pirq(gsi, triggering);
334 setup_gsi.triggering = (triggering == ACPI_EDGE_SENSITIVE ? 0 : 1);
335 setup_gsi.polarity = (polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
337 rc = HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi);
339 printk(KERN_INFO "Already setup the GSI :%d\n", gsi);
341 printk(KERN_ERR "Failed to setup GSI :%d, err_code:%d\n",
348 static __init void xen_setup_acpi_sci(void)
351 int trigger, polarity;
352 int gsi = acpi_sci_override_gsi;
357 rc = acpi_get_override_irq(gsi, &trigger, &polarity);
359 printk(KERN_WARNING "xen: acpi_get_override_irq failed for acpi"
360 " sci, rc=%d\n", rc);
363 trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
364 polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
366 printk(KERN_INFO "xen: sci override: global_irq=%d trigger=%d "
367 "polarity=%d\n", gsi, trigger, polarity);
369 gsi = xen_register_gsi(gsi, trigger, polarity);
370 printk(KERN_INFO "xen: acpi sci %d\n", gsi);
375 static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
376 int trigger, int polarity)
378 return xen_register_gsi(gsi, trigger, polarity);
381 static int __init pci_xen_initial_domain(void)
383 #ifdef CONFIG_PCI_MSI
384 x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs;
385 x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
387 xen_setup_acpi_sci();
388 __acpi_register_gsi = acpi_register_gsi_xen;
393 void __init xen_setup_pirqs(void)
397 pci_xen_initial_domain();
399 if (0 == nr_ioapics) {
400 for (irq = 0; irq < NR_IRQS_LEGACY; irq++)
401 xen_allocate_pirq(irq, 0, "xt-pic");
405 /* Pre-allocate legacy irqs */
406 for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
407 int trigger, polarity;
409 if (acpi_get_override_irq(irq, &trigger, &polarity) == -1)
412 xen_register_pirq(irq,
413 trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE);