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 #define XEN_PIRQ_MSI_DATA (MSI_DATA_TRIGGER_EDGE | \
74 MSI_DATA_LEVEL_ASSERT | (3 << 8) | MSI_DATA_VECTOR(0))
76 static void xen_msi_compose_msg(struct pci_dev *pdev, unsigned int pirq,
79 /* We set vector == 0 to tell the hypervisor we don't care about it,
80 * but we want a pirq setup instead.
81 * We use the dest_id field to pass the pirq that we want. */
82 msg->address_hi = MSI_ADDR_BASE_HI | MSI_ADDR_EXT_DEST_ID(pirq);
85 MSI_ADDR_DEST_MODE_PHYSICAL |
86 MSI_ADDR_REDIRECTION_CPU |
87 MSI_ADDR_DEST_ID(pirq);
89 msg->data = XEN_PIRQ_MSI_DATA;
92 static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
94 int irq, pirq, ret = 0;
95 struct msi_desc *msidesc;
98 list_for_each_entry(msidesc, &dev->msi_list, list) {
99 __read_msi_msg(msidesc, &msg);
100 pirq = MSI_ADDR_EXT_DEST_ID(msg.address_hi) |
101 ((msg.address_lo >> MSI_ADDR_DEST_ID_SHIFT) & 0xff);
102 if (xen_irq_from_pirq(pirq) >= 0 && msg.data == XEN_PIRQ_MSI_DATA) {
103 xen_allocate_pirq_msi((type == PCI_CAP_ID_MSIX) ?
104 "msi-x" : "msi", &irq, &pirq, XEN_ALLOC_IRQ);
107 ret = set_irq_msi(irq, msidesc);
110 printk(KERN_DEBUG "xen: msi already setup: msi --> irq=%d"
111 " pirq=%d\n", irq, pirq);
114 xen_allocate_pirq_msi((type == PCI_CAP_ID_MSIX) ?
115 "msi-x" : "msi", &irq, &pirq, (XEN_ALLOC_IRQ | XEN_ALLOC_PIRQ));
116 if (irq < 0 || pirq < 0)
118 printk(KERN_DEBUG "xen: msi --> irq=%d, pirq=%d\n", irq, pirq);
119 xen_msi_compose_msg(dev, pirq, &msg);
120 ret = set_irq_msi(irq, msidesc);
123 write_msi_msg(irq, &msg);
128 unbind_from_irqhandler(irq, NULL);
131 dev_err(&dev->dev, "Xen PCI frontend has not registered" \
132 " MSI/MSI-X support!\n");
138 * For MSI interrupts we have to use drivers/xen/event.s functions to
139 * allocate an irq_desc and setup the right */
142 static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
145 struct msi_desc *msidesc;
148 v = kzalloc(sizeof(int) * max(1, nvec), GFP_KERNEL);
152 if (type == PCI_CAP_ID_MSIX)
153 ret = xen_pci_frontend_enable_msix(dev, v, nvec);
155 ret = xen_pci_frontend_enable_msi(dev, v);
159 list_for_each_entry(msidesc, &dev->msi_list, list) {
160 xen_allocate_pirq_msi(
161 (type == PCI_CAP_ID_MSIX) ?
162 "pcifront-msi-x" : "pcifront-msi",
163 &irq, &v[i], XEN_ALLOC_IRQ);
168 ret = set_irq_msi(irq, msidesc);
177 unbind_from_irqhandler(irq, NULL);
180 dev_err(&dev->dev, "Xen PCI frontend has not registered" \
181 " MSI/MSI-X support!\n");
187 static void xen_teardown_msi_irqs(struct pci_dev *dev)
189 struct msi_desc *msidesc;
191 msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
192 if (msidesc->msi_attrib.is_msix)
193 xen_pci_frontend_disable_msix(dev);
195 xen_pci_frontend_disable_msi(dev);
197 /* Free the IRQ's and the msidesc using the generic code. */
198 default_teardown_msi_irqs(dev);
201 static void xen_teardown_msi_irq(unsigned int irq)
203 xen_destroy_irq(irq);
206 static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
209 struct msi_desc *msidesc;
211 list_for_each_entry(msidesc, &dev->msi_list, list) {
212 irq = xen_create_msi_irq(dev, msidesc, type);
216 ret = set_irq_msi(irq, msidesc);
223 xen_destroy_irq(irq);
228 static int xen_pcifront_enable_irq(struct pci_dev *dev)
233 dev_info(&dev->dev, "Xen PCI enabling IRQ: %d\n", dev->irq);
238 if (dev->irq < NR_IRQS_LEGACY)
241 rc = xen_allocate_pirq(dev->irq, share, "pcifront");
243 dev_warn(&dev->dev, "Xen PCI IRQ: %d, failed to register:%d\n",
250 int __init pci_xen_init(void)
252 if (!xen_pv_domain() || xen_initial_domain())
255 printk(KERN_INFO "PCI: setting up Xen PCI frontend stub\n");
257 pcibios_set_cache_line_size();
259 pcibios_enable_irq = xen_pcifront_enable_irq;
260 pcibios_disable_irq = NULL;
263 /* Keep ACPI out of the picture */
267 #ifdef CONFIG_PCI_MSI
268 x86_msi.setup_msi_irqs = xen_setup_msi_irqs;
269 x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
270 x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs;
275 int __init pci_xen_hvm_init(void)
277 if (!xen_feature(XENFEAT_hvm_pirqs))
282 * We don't want to change the actual ACPI delivery model,
283 * just how GSIs get registered.
285 __acpi_register_gsi = acpi_register_gsi_xen_hvm;
288 #ifdef CONFIG_PCI_MSI
289 x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs;
290 x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
295 #ifdef CONFIG_XEN_DOM0
296 static int xen_register_pirq(u32 gsi, int triggering)
299 struct physdev_map_pirq map_irq;
303 if (!xen_pv_domain())
306 if (triggering == ACPI_EDGE_SENSITIVE) {
308 name = "ioapic-edge";
311 name = "ioapic-level";
314 irq = xen_allocate_pirq(gsi, shareable, name);
316 printk(KERN_DEBUG "xen: --> irq=%d\n", irq);
321 map_irq.domid = DOMID_SELF;
322 map_irq.type = MAP_PIRQ_TYPE_GSI;
326 rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
328 printk(KERN_WARNING "xen map irq failed %d\n", rc);
336 static int xen_register_gsi(u32 gsi, int triggering, int polarity)
339 struct physdev_setup_gsi setup_gsi;
341 if (!xen_pv_domain())
344 printk(KERN_DEBUG "xen: registering gsi %u triggering %d polarity %d\n",
345 gsi, triggering, polarity);
347 irq = xen_register_pirq(gsi, triggering);
350 setup_gsi.triggering = (triggering == ACPI_EDGE_SENSITIVE ? 0 : 1);
351 setup_gsi.polarity = (polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
353 rc = HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi);
355 printk(KERN_INFO "Already setup the GSI :%d\n", gsi);
357 printk(KERN_ERR "Failed to setup GSI :%d, err_code:%d\n",
364 static __init void xen_setup_acpi_sci(void)
367 int trigger, polarity;
368 int gsi = acpi_sci_override_gsi;
373 rc = acpi_get_override_irq(gsi, &trigger, &polarity);
375 printk(KERN_WARNING "xen: acpi_get_override_irq failed for acpi"
376 " sci, rc=%d\n", rc);
379 trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
380 polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
382 printk(KERN_INFO "xen: sci override: global_irq=%d trigger=%d "
383 "polarity=%d\n", gsi, trigger, polarity);
385 gsi = xen_register_gsi(gsi, trigger, polarity);
386 printk(KERN_INFO "xen: acpi sci %d\n", gsi);
391 static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
392 int trigger, int polarity)
394 return xen_register_gsi(gsi, trigger, polarity);
397 static int __init pci_xen_initial_domain(void)
399 #ifdef CONFIG_PCI_MSI
400 x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs;
401 x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
403 xen_setup_acpi_sci();
404 __acpi_register_gsi = acpi_register_gsi_xen;
409 void __init xen_setup_pirqs(void)
413 pci_xen_initial_domain();
415 if (0 == nr_ioapics) {
416 for (irq = 0; irq < NR_IRQS_LEGACY; irq++)
417 xen_allocate_pirq(irq, 0, "xt-pic");
421 /* Pre-allocate legacy irqs */
422 for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
423 int trigger, polarity;
425 if (acpi_get_override_irq(irq, &trigger, &polarity) == -1)
428 xen_register_pirq(irq,
429 trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE);