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
;
70 map_irq
.domid
= DOMID_SELF
;
71 map_irq
.type
= MAP_PIRQ_TYPE_GSI
;
75 rc
= HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq
, &map_irq
);
77 printk(KERN_WARNING
"xen map irq failed %d\n", rc
);
81 if (triggering
== ACPI_EDGE_SENSITIVE
) {
86 name
= "ioapic-level";
89 if (gsi_override
>= 0)
92 irq
= xen_bind_pirq_gsi_to_irq(gsi
, map_irq
.pirq
, shareable
, name
);
96 printk(KERN_DEBUG
"xen: --> pirq=%d -> irq=%d (gsi=%d)\n", map_irq
.pirq
, irq
, gsi
);
101 static int acpi_register_gsi_xen_hvm(struct device
*dev
, u32 gsi
,
102 int trigger
, int polarity
)
104 if (!xen_hvm_domain())
107 return xen_register_pirq(gsi
, -1 /* no GSI override */, trigger
,
108 false /* no mapping of GSI to PIRQ */);
111 #ifdef CONFIG_XEN_DOM0
112 static int xen_register_gsi(u32 gsi
, int gsi_override
, int triggering
, int polarity
)
115 struct physdev_setup_gsi setup_gsi
;
117 if (!xen_pv_domain())
120 printk(KERN_DEBUG
"xen: registering gsi %u triggering %d polarity %d\n",
121 gsi
, triggering
, polarity
);
123 irq
= xen_register_pirq(gsi
, gsi_override
, triggering
, true);
126 setup_gsi
.triggering
= (triggering
== ACPI_EDGE_SENSITIVE
? 0 : 1);
127 setup_gsi
.polarity
= (polarity
== ACPI_ACTIVE_HIGH
? 0 : 1);
129 rc
= HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi
, &setup_gsi
);
131 printk(KERN_INFO
"Already setup the GSI :%d\n", gsi
);
133 printk(KERN_ERR
"Failed to setup GSI :%d, err_code:%d\n",
140 static int acpi_register_gsi_xen(struct device
*dev
, u32 gsi
,
141 int trigger
, int polarity
)
143 return xen_register_gsi(gsi
, -1 /* no GSI override */, trigger
, polarity
);
148 #if defined(CONFIG_PCI_MSI)
149 #include <linux/msi.h>
150 #include <asm/msidef.h>
152 struct xen_pci_frontend_ops
*xen_pci_frontend
;
153 EXPORT_SYMBOL_GPL(xen_pci_frontend
);
155 static int xen_setup_msi_irqs(struct pci_dev
*dev
, int nvec
, int type
)
158 struct msi_desc
*msidesc
;
161 v
= kzalloc(sizeof(int) * max(1, nvec
), GFP_KERNEL
);
165 if (type
== PCI_CAP_ID_MSIX
)
166 ret
= xen_pci_frontend_enable_msix(dev
, v
, nvec
);
168 ret
= xen_pci_frontend_enable_msi(dev
, v
);
172 list_for_each_entry(msidesc
, &dev
->msi_list
, list
) {
173 irq
= xen_bind_pirq_msi_to_irq(dev
, msidesc
, v
[i
], 0,
174 (type
== PCI_CAP_ID_MSIX
) ?
188 dev_err(&dev
->dev
, "Xen PCI frontend has not registered MSI/MSI-X support!\n");
194 #define XEN_PIRQ_MSI_DATA (MSI_DATA_TRIGGER_EDGE | \
195 MSI_DATA_LEVEL_ASSERT | (3 << 8) | MSI_DATA_VECTOR(0))
197 static void xen_msi_compose_msg(struct pci_dev
*pdev
, unsigned int pirq
,
200 /* We set vector == 0 to tell the hypervisor we don't care about it,
201 * but we want a pirq setup instead.
202 * We use the dest_id field to pass the pirq that we want. */
203 msg
->address_hi
= MSI_ADDR_BASE_HI
| MSI_ADDR_EXT_DEST_ID(pirq
);
206 MSI_ADDR_DEST_MODE_PHYSICAL
|
207 MSI_ADDR_REDIRECTION_CPU
|
208 MSI_ADDR_DEST_ID(pirq
);
210 msg
->data
= XEN_PIRQ_MSI_DATA
;
213 static int xen_hvm_setup_msi_irqs(struct pci_dev
*dev
, int nvec
, int type
)
216 struct msi_desc
*msidesc
;
219 list_for_each_entry(msidesc
, &dev
->msi_list
, list
) {
220 __read_msi_msg(msidesc
, &msg
);
221 pirq
= MSI_ADDR_EXT_DEST_ID(msg
.address_hi
) |
222 ((msg
.address_lo
>> MSI_ADDR_DEST_ID_SHIFT
) & 0xff);
223 if (msg
.data
!= XEN_PIRQ_MSI_DATA
||
224 xen_irq_from_pirq(pirq
) < 0) {
225 pirq
= xen_allocate_pirq_msi(dev
, msidesc
);
230 xen_msi_compose_msg(dev
, pirq
, &msg
);
231 __write_msi_msg(msidesc
, &msg
);
232 dev_dbg(&dev
->dev
, "xen: msi bound to pirq=%d\n", pirq
);
235 "xen: msi already bound to pirq=%d\n", pirq
);
237 irq
= xen_bind_pirq_msi_to_irq(dev
, msidesc
, pirq
, 0,
238 (type
== PCI_CAP_ID_MSIX
) ?
244 "xen: msi --> pirq=%d --> irq=%d\n", pirq
, irq
);
250 "Xen PCI frontend has not registered MSI/MSI-X support!\n");
254 #ifdef CONFIG_XEN_DOM0
255 static bool __read_mostly pci_seg_supported
= true;
257 static int xen_initdom_setup_msi_irqs(struct pci_dev
*dev
, int nvec
, int type
)
260 struct msi_desc
*msidesc
;
262 list_for_each_entry(msidesc
, &dev
->msi_list
, list
) {
263 struct physdev_map_pirq map_irq
;
266 domid
= ret
= xen_find_device_domain_owner(dev
);
267 /* N.B. Casting int's -ENODEV to uint16_t results in 0xFFED,
268 * hence check ret value for < 0. */
272 memset(&map_irq
, 0, sizeof(map_irq
));
273 map_irq
.domid
= domid
;
274 map_irq
.type
= MAP_PIRQ_TYPE_MSI_SEG
;
277 map_irq
.bus
= dev
->bus
->number
|
278 (pci_domain_nr(dev
->bus
) << 16);
279 map_irq
.devfn
= dev
->devfn
;
281 if (type
== PCI_CAP_ID_MSIX
) {
283 u32 table_offset
, bir
;
285 pos
= pci_find_capability(dev
, PCI_CAP_ID_MSIX
);
287 pci_read_config_dword(dev
, pos
+ PCI_MSIX_TABLE
,
289 bir
= (u8
)(table_offset
& PCI_MSIX_FLAGS_BIRMASK
);
291 map_irq
.table_base
= pci_resource_start(dev
, bir
);
292 map_irq
.entry_nr
= msidesc
->msi_attrib
.entry_nr
;
296 if (pci_seg_supported
)
297 ret
= HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq
,
299 if (ret
== -EINVAL
&& !pci_domain_nr(dev
->bus
)) {
300 map_irq
.type
= MAP_PIRQ_TYPE_MSI
;
303 map_irq
.bus
= dev
->bus
->number
;
304 ret
= HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq
,
307 pci_seg_supported
= false;
310 dev_warn(&dev
->dev
, "xen map irq failed %d for %d domain\n",
315 ret
= xen_bind_pirq_msi_to_irq(dev
, msidesc
,
316 map_irq
.pirq
, map_irq
.index
,
317 (type
== PCI_CAP_ID_MSIX
) ?
329 static void xen_teardown_msi_irqs(struct pci_dev
*dev
)
331 struct msi_desc
*msidesc
;
333 msidesc
= list_entry(dev
->msi_list
.next
, struct msi_desc
, list
);
334 if (msidesc
->msi_attrib
.is_msix
)
335 xen_pci_frontend_disable_msix(dev
);
337 xen_pci_frontend_disable_msi(dev
);
339 /* Free the IRQ's and the msidesc using the generic code. */
340 default_teardown_msi_irqs(dev
);
343 static void xen_teardown_msi_irq(unsigned int irq
)
345 xen_destroy_irq(irq
);
350 int __init
pci_xen_init(void)
352 if (!xen_pv_domain() || xen_initial_domain())
355 printk(KERN_INFO
"PCI: setting up Xen PCI frontend stub\n");
357 pcibios_set_cache_line_size();
359 pcibios_enable_irq
= xen_pcifront_enable_irq
;
360 pcibios_disable_irq
= NULL
;
363 /* Keep ACPI out of the picture */
367 #ifdef CONFIG_PCI_MSI
368 x86_msi
.setup_msi_irqs
= xen_setup_msi_irqs
;
369 x86_msi
.teardown_msi_irq
= xen_teardown_msi_irq
;
370 x86_msi
.teardown_msi_irqs
= xen_teardown_msi_irqs
;
375 int __init
pci_xen_hvm_init(void)
377 if (!xen_have_vector_callback
|| !xen_feature(XENFEAT_hvm_pirqs
))
382 * We don't want to change the actual ACPI delivery model,
383 * just how GSIs get registered.
385 __acpi_register_gsi
= acpi_register_gsi_xen_hvm
;
388 #ifdef CONFIG_PCI_MSI
389 x86_msi
.setup_msi_irqs
= xen_hvm_setup_msi_irqs
;
390 x86_msi
.teardown_msi_irq
= xen_teardown_msi_irq
;
395 #ifdef CONFIG_XEN_DOM0
396 static __init
void xen_setup_acpi_sci(void)
399 int trigger
, polarity
;
400 int gsi
= acpi_sci_override_gsi
;
402 int gsi_override
= -1;
407 rc
= acpi_get_override_irq(gsi
, &trigger
, &polarity
);
409 printk(KERN_WARNING
"xen: acpi_get_override_irq failed for acpi"
410 " sci, rc=%d\n", rc
);
413 trigger
= trigger
? ACPI_LEVEL_SENSITIVE
: ACPI_EDGE_SENSITIVE
;
414 polarity
= polarity
? ACPI_ACTIVE_LOW
: ACPI_ACTIVE_HIGH
;
416 printk(KERN_INFO
"xen: sci override: global_irq=%d trigger=%d "
417 "polarity=%d\n", gsi
, trigger
, polarity
);
419 /* Before we bind the GSI to a Linux IRQ, check whether
420 * we need to override it with bus_irq (IRQ) value. Usually for
421 * IRQs below IRQ_LEGACY_IRQ this holds IRQ == GSI, as so:
422 * ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 low level)
423 * but there are oddballs where the IRQ != GSI:
424 * ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 20 low level)
425 * which ends up being: gsi_to_irq[9] == 20
426 * (which is what acpi_gsi_to_irq ends up calling when starting the
427 * the ACPI interpreter and keels over since IRQ 9 has not been
428 * setup as we had setup IRQ 20 for it).
430 if (acpi_gsi_to_irq(gsi
, &irq
) == 0) {
431 /* Use the provided value if it's valid. */
436 gsi
= xen_register_gsi(gsi
, gsi_override
, trigger
, polarity
);
437 printk(KERN_INFO
"xen: acpi sci %d\n", gsi
);
442 int __init
pci_xen_initial_domain(void)
446 #ifdef CONFIG_PCI_MSI
447 x86_msi
.setup_msi_irqs
= xen_initdom_setup_msi_irqs
;
448 x86_msi
.teardown_msi_irq
= xen_teardown_msi_irq
;
450 xen_setup_acpi_sci();
451 __acpi_register_gsi
= acpi_register_gsi_xen
;
452 /* Pre-allocate legacy irqs */
453 for (irq
= 0; irq
< NR_IRQS_LEGACY
; irq
++) {
454 int trigger
, polarity
;
456 if (acpi_get_override_irq(irq
, &trigger
, &polarity
) == -1)
459 xen_register_pirq(irq
, -1 /* no GSI override */,
460 trigger
? ACPI_LEVEL_SENSITIVE
: ACPI_EDGE_SENSITIVE
,
461 true /* Map GSI to PIRQ */);
463 if (0 == nr_ioapics
) {
464 for (irq
= 0; irq
< NR_IRQS_LEGACY
; irq
++)
465 xen_bind_pirq_gsi_to_irq(irq
, irq
, 0, "xt-pic");
470 struct xen_device_domain_owner
{
473 struct list_head list
;
476 static DEFINE_SPINLOCK(dev_domain_list_spinlock
);
477 static struct list_head dev_domain_list
= LIST_HEAD_INIT(dev_domain_list
);
479 static struct xen_device_domain_owner
*find_device(struct pci_dev
*dev
)
481 struct xen_device_domain_owner
*owner
;
483 list_for_each_entry(owner
, &dev_domain_list
, list
) {
484 if (owner
->dev
== dev
)
490 int xen_find_device_domain_owner(struct pci_dev
*dev
)
492 struct xen_device_domain_owner
*owner
;
493 int domain
= -ENODEV
;
495 spin_lock(&dev_domain_list_spinlock
);
496 owner
= find_device(dev
);
498 domain
= owner
->domain
;
499 spin_unlock(&dev_domain_list_spinlock
);
502 EXPORT_SYMBOL_GPL(xen_find_device_domain_owner
);
504 int xen_register_device_domain_owner(struct pci_dev
*dev
, uint16_t domain
)
506 struct xen_device_domain_owner
*owner
;
508 owner
= kzalloc(sizeof(struct xen_device_domain_owner
), GFP_KERNEL
);
512 spin_lock(&dev_domain_list_spinlock
);
513 if (find_device(dev
)) {
514 spin_unlock(&dev_domain_list_spinlock
);
518 owner
->domain
= domain
;
520 list_add_tail(&owner
->list
, &dev_domain_list
);
521 spin_unlock(&dev_domain_list_spinlock
);
524 EXPORT_SYMBOL_GPL(xen_register_device_domain_owner
);
526 int xen_unregister_device_domain_owner(struct pci_dev
*dev
)
528 struct xen_device_domain_owner
*owner
;
530 spin_lock(&dev_domain_list_spinlock
);
531 owner
= find_device(dev
);
533 spin_unlock(&dev_domain_list_spinlock
);
536 list_del(&owner
->list
);
537 spin_unlock(&dev_domain_list_spinlock
);
541 EXPORT_SYMBOL_GPL(xen_unregister_device_domain_owner
);