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Diffstat (limited to 'arch/x86/pci/xen.c')
-rw-r--r--arch/x86/pci/xen.c119
1 files changed, 100 insertions, 19 deletions
diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index 1017c7bee38..905956f1646 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -64,6 +64,10 @@ static int xen_register_pirq(u32 gsi, int gsi_override, int triggering,
int shareable = 0;
char *name;
+ irq = xen_irq_from_gsi(gsi);
+ if (irq > 0)
+ return irq;
+
if (set_pirq)
pirq = gsi;
@@ -158,6 +162,9 @@ static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
struct msi_desc *msidesc;
int *v;
+ if (type == PCI_CAP_ID_MSI && nvec > 1)
+ return 1;
+
v = kzalloc(sizeof(int) * max(1, nvec), GFP_KERNEL);
if (!v)
return -ENOMEM;
@@ -170,13 +177,16 @@ static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
goto error;
i = 0;
list_for_each_entry(msidesc, &dev->msi_list, list) {
- irq = xen_bind_pirq_msi_to_irq(dev, msidesc, v[i], 0,
+ irq = xen_bind_pirq_msi_to_irq(dev, msidesc, v[i],
+ (type == PCI_CAP_ID_MSI) ? nvec : 1,
(type == PCI_CAP_ID_MSIX) ?
"pcifront-msi-x" :
"pcifront-msi",
DOMID_SELF);
- if (irq < 0)
+ if (irq < 0) {
+ ret = irq;
goto free;
+ }
i++;
}
kfree(v);
@@ -214,6 +224,9 @@ static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
struct msi_desc *msidesc;
struct msi_msg msg;
+ if (type == PCI_CAP_ID_MSI && nvec > 1)
+ return 1;
+
list_for_each_entry(msidesc, &dev->msi_list, list) {
__read_msi_msg(msidesc, &msg);
pirq = MSI_ADDR_EXT_DEST_ID(msg.address_hi) |
@@ -221,8 +234,10 @@ static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
if (msg.data != XEN_PIRQ_MSI_DATA ||
xen_irq_from_pirq(pirq) < 0) {
pirq = xen_allocate_pirq_msi(dev, msidesc);
- if (pirq < 0)
+ if (pirq < 0) {
+ irq = -ENODEV;
goto error;
+ }
xen_msi_compose_msg(dev, pirq, &msg);
__write_msi_msg(msidesc, &msg);
dev_dbg(&dev->dev, "xen: msi bound to pirq=%d\n", pirq);
@@ -230,7 +245,8 @@ static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
dev_dbg(&dev->dev,
"xen: msi already bound to pirq=%d\n", pirq);
}
- irq = xen_bind_pirq_msi_to_irq(dev, msidesc, pirq, 0,
+ irq = xen_bind_pirq_msi_to_irq(dev, msidesc, pirq,
+ (type == PCI_CAP_ID_MSI) ? nvec : 1,
(type == PCI_CAP_ID_MSIX) ?
"msi-x" : "msi",
DOMID_SELF);
@@ -244,10 +260,12 @@ static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
error:
dev_err(&dev->dev,
"Xen PCI frontend has not registered MSI/MSI-X support!\n");
- return -ENODEV;
+ return irq;
}
#ifdef CONFIG_XEN_DOM0
+static bool __read_mostly pci_seg_supported = true;
+
static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
{
int ret = 0;
@@ -265,38 +283,63 @@ static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
memset(&map_irq, 0, sizeof(map_irq));
map_irq.domid = domid;
- map_irq.type = MAP_PIRQ_TYPE_MSI;
+ map_irq.type = MAP_PIRQ_TYPE_MSI_SEG;
map_irq.index = -1;
map_irq.pirq = -1;
- map_irq.bus = dev->bus->number;
+ map_irq.bus = dev->bus->number |
+ (pci_domain_nr(dev->bus) << 16);
map_irq.devfn = dev->devfn;
- if (type == PCI_CAP_ID_MSIX) {
+ if (type == PCI_CAP_ID_MSI && nvec > 1) {
+ map_irq.type = MAP_PIRQ_TYPE_MULTI_MSI;
+ map_irq.entry_nr = nvec;
+ } else if (type == PCI_CAP_ID_MSIX) {
int pos;
u32 table_offset, bir;
- pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
-
+ pos = dev->msix_cap;
pci_read_config_dword(dev, pos + PCI_MSIX_TABLE,
&table_offset);
- bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK);
+ bir = (u8)(table_offset & PCI_MSIX_TABLE_BIR);
map_irq.table_base = pci_resource_start(dev, bir);
map_irq.entry_nr = msidesc->msi_attrib.entry_nr;
}
- ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
+ ret = -EINVAL;
+ if (pci_seg_supported)
+ ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq,
+ &map_irq);
+ if (type == PCI_CAP_ID_MSI && nvec > 1 && ret) {
+ /*
+ * If MAP_PIRQ_TYPE_MULTI_MSI is not available
+ * there's nothing else we can do in this case.
+ * Just set ret > 0 so driver can retry with
+ * single MSI.
+ */
+ ret = 1;
+ goto out;
+ }
+ if (ret == -EINVAL && !pci_domain_nr(dev->bus)) {
+ map_irq.type = MAP_PIRQ_TYPE_MSI;
+ map_irq.index = -1;
+ map_irq.pirq = -1;
+ map_irq.bus = dev->bus->number;
+ ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq,
+ &map_irq);
+ if (ret != -EINVAL)
+ pci_seg_supported = false;
+ }
if (ret) {
dev_warn(&dev->dev, "xen map irq failed %d for %d domain\n",
ret, domid);
goto out;
}
- ret = xen_bind_pirq_msi_to_irq(dev, msidesc,
- map_irq.pirq, map_irq.index,
- (type == PCI_CAP_ID_MSIX) ?
- "msi-x" : "msi",
- domid);
+ ret = xen_bind_pirq_msi_to_irq(dev, msidesc, map_irq.pirq,
+ (type == PCI_CAP_ID_MSI) ? nvec : 1,
+ (type == PCI_CAP_ID_MSIX) ? "msi-x" : "msi",
+ domid);
if (ret < 0)
goto out;
}
@@ -304,6 +347,32 @@ static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
out:
return ret;
}
+
+static void xen_initdom_restore_msi_irqs(struct pci_dev *dev)
+{
+ int ret = 0;
+
+ if (pci_seg_supported) {
+ struct physdev_pci_device restore_ext;
+
+ restore_ext.seg = pci_domain_nr(dev->bus);
+ restore_ext.bus = dev->bus->number;
+ restore_ext.devfn = dev->devfn;
+ ret = HYPERVISOR_physdev_op(PHYSDEVOP_restore_msi_ext,
+ &restore_ext);
+ if (ret == -ENOSYS)
+ pci_seg_supported = false;
+ WARN(ret && ret != -ENOSYS, "restore_msi_ext -> %d\n", ret);
+ }
+ if (!pci_seg_supported) {
+ struct physdev_restore_msi restore;
+
+ restore.bus = dev->bus->number;
+ restore.devfn = dev->devfn;
+ ret = HYPERVISOR_physdev_op(PHYSDEVOP_restore_msi, &restore);
+ WARN(ret && ret != -ENOSYS, "restore_msi -> %d\n", ret);
+ }
+}
#endif
static void xen_teardown_msi_irqs(struct pci_dev *dev)
@@ -324,7 +393,14 @@ static void xen_teardown_msi_irq(unsigned int irq)
{
xen_destroy_irq(irq);
}
-
+static u32 xen_nop_msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag)
+{
+ return 0;
+}
+static u32 xen_nop_msix_mask_irq(struct msi_desc *desc, u32 flag)
+{
+ return 0;
+}
#endif
int __init pci_xen_init(void)
@@ -348,13 +424,15 @@ int __init pci_xen_init(void)
x86_msi.setup_msi_irqs = xen_setup_msi_irqs;
x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs;
+ x86_msi.msi_mask_irq = xen_nop_msi_mask_irq;
+ x86_msi.msix_mask_irq = xen_nop_msix_mask_irq;
#endif
return 0;
}
int __init pci_xen_hvm_init(void)
{
- if (!xen_feature(XENFEAT_hvm_pirqs))
+ if (!xen_have_vector_callback || !xen_feature(XENFEAT_hvm_pirqs))
return 0;
#ifdef CONFIG_ACPI
@@ -426,6 +504,9 @@ int __init pci_xen_initial_domain(void)
#ifdef CONFIG_PCI_MSI
x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs;
x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
+ x86_msi.restore_msi_irqs = xen_initdom_restore_msi_irqs;
+ x86_msi.msi_mask_irq = xen_nop_msi_mask_irq;
+ x86_msi.msix_mask_irq = xen_nop_msix_mask_irq;
#endif
xen_setup_acpi_sci();
__acpi_register_gsi = acpi_register_gsi_xen;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-06 00:12:30 +0000