aboutsummaryrefslogtreecommitdiffstats
path: root/arch/x86/pci
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/pci')
-rw-r--r--arch/x86/pci/acpi.c103
-rw-r--r--arch/x86/pci/xen.c35
2 files changed, 108 insertions, 30 deletions
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index 15466c096ba5..0972315c3860 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -138,7 +138,6 @@ setup_resource(struct acpi_resource *acpi_res, void *data)
struct acpi_resource_address64 addr;
acpi_status status;
unsigned long flags;
- struct resource *root, *conflict;
u64 start, end;
status = resource_to_addr(acpi_res, &addr);
@@ -146,12 +145,10 @@ setup_resource(struct acpi_resource *acpi_res, void *data)
return AE_OK;
if (addr.resource_type == ACPI_MEMORY_RANGE) {
- root = &iomem_resource;
flags = IORESOURCE_MEM;
if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
flags |= IORESOURCE_PREFETCH;
} else if (addr.resource_type == ACPI_IO_RANGE) {
- root = &ioport_resource;
flags = IORESOURCE_IO;
} else
return AE_OK;
@@ -172,25 +169,90 @@ setup_resource(struct acpi_resource *acpi_res, void *data)
return AE_OK;
}
- conflict = insert_resource_conflict(root, res);
- if (conflict) {
- dev_err(&info->bridge->dev,
- "address space collision: host bridge window %pR "
- "conflicts with %s %pR\n",
- res, conflict->name, conflict);
- } else {
- pci_bus_add_resource(info->bus, res, 0);
- info->res_num++;
- if (addr.translation_offset)
- dev_info(&info->bridge->dev, "host bridge window %pR "
- "(PCI address [%#llx-%#llx])\n",
- res, res->start - addr.translation_offset,
- res->end - addr.translation_offset);
+ info->res_num++;
+ if (addr.translation_offset)
+ dev_info(&info->bridge->dev, "host bridge window %pR "
+ "(PCI address [%#llx-%#llx])\n",
+ res, res->start - addr.translation_offset,
+ res->end - addr.translation_offset);
+ else
+ dev_info(&info->bridge->dev, "host bridge window %pR\n", res);
+
+ return AE_OK;
+}
+
+static bool resource_contains(struct resource *res, resource_size_t point)
+{
+ if (res->start <= point && point <= res->end)
+ return true;
+ return false;
+}
+
+static void coalesce_windows(struct pci_root_info *info, int type)
+{
+ int i, j;
+ struct resource *res1, *res2;
+
+ for (i = 0; i < info->res_num; i++) {
+ res1 = &info->res[i];
+ if (!(res1->flags & type))
+ continue;
+
+ for (j = i + 1; j < info->res_num; j++) {
+ res2 = &info->res[j];
+ if (!(res2->flags & type))
+ continue;
+
+ /*
+ * I don't like throwing away windows because then
+ * our resources no longer match the ACPI _CRS, but
+ * the kernel resource tree doesn't allow overlaps.
+ */
+ if (resource_contains(res1, res2->start) ||
+ resource_contains(res1, res2->end) ||
+ resource_contains(res2, res1->start) ||
+ resource_contains(res2, res1->end)) {
+ res1->start = min(res1->start, res2->start);
+ res1->end = max(res1->end, res2->end);
+ dev_info(&info->bridge->dev,
+ "host bridge window expanded to %pR; %pR ignored\n",
+ res1, res2);
+ res2->flags = 0;
+ }
+ }
+ }
+}
+
+static void add_resources(struct pci_root_info *info)
+{
+ int i;
+ struct resource *res, *root, *conflict;
+
+ if (!pci_use_crs)
+ return;
+
+ coalesce_windows(info, IORESOURCE_MEM);
+ coalesce_windows(info, IORESOURCE_IO);
+
+ for (i = 0; i < info->res_num; i++) {
+ res = &info->res[i];
+
+ if (res->flags & IORESOURCE_MEM)
+ root = &iomem_resource;
+ else if (res->flags & IORESOURCE_IO)
+ root = &ioport_resource;
else
- dev_info(&info->bridge->dev,
- "host bridge window %pR\n", res);
+ continue;
+
+ conflict = insert_resource_conflict(root, res);
+ if (conflict)
+ dev_err(&info->bridge->dev,
+ "address space collision: host bridge window %pR "
+ "conflicts with %s %pR\n",
+ res, conflict->name, conflict);
+ else
+ pci_bus_add_resource(info->bus, res, 0);
}
- return AE_OK;
}
static void
@@ -224,6 +286,7 @@ get_current_resources(struct acpi_device *device, int busnum,
acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
&info);
+ add_resources(&info);
return;
name_alloc_fail:
diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index 117f5b8daf75..25cd4a07d09f 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -70,6 +70,9 @@ static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
struct xen_pci_frontend_ops *xen_pci_frontend;
EXPORT_SYMBOL_GPL(xen_pci_frontend);
+#define XEN_PIRQ_MSI_DATA (MSI_DATA_TRIGGER_EDGE | \
+ MSI_DATA_LEVEL_ASSERT | (3 << 8) | MSI_DATA_VECTOR(0))
+
static void xen_msi_compose_msg(struct pci_dev *pdev, unsigned int pirq,
struct msi_msg *msg)
{
@@ -83,12 +86,7 @@ static void xen_msi_compose_msg(struct pci_dev *pdev, unsigned int pirq,
MSI_ADDR_REDIRECTION_CPU |
MSI_ADDR_DEST_ID(pirq);
- msg->data =
- MSI_DATA_TRIGGER_EDGE |
- MSI_DATA_LEVEL_ASSERT |
- /* delivery mode reserved */
- (3 << 8) |
- MSI_DATA_VECTOR(0);
+ msg->data = XEN_PIRQ_MSI_DATA;
}
static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
@@ -98,8 +96,23 @@ static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
struct msi_msg msg;
list_for_each_entry(msidesc, &dev->msi_list, list) {
+ __read_msi_msg(msidesc, &msg);
+ pirq = MSI_ADDR_EXT_DEST_ID(msg.address_hi) |
+ ((msg.address_lo >> MSI_ADDR_DEST_ID_SHIFT) & 0xff);
+ if (xen_irq_from_pirq(pirq) >= 0 && msg.data == XEN_PIRQ_MSI_DATA) {
+ xen_allocate_pirq_msi((type == PCI_CAP_ID_MSIX) ?
+ "msi-x" : "msi", &irq, &pirq, XEN_ALLOC_IRQ);
+ if (irq < 0)
+ goto error;
+ ret = set_irq_msi(irq, msidesc);
+ if (ret < 0)
+ goto error_while;
+ printk(KERN_DEBUG "xen: msi already setup: msi --> irq=%d"
+ " pirq=%d\n", irq, pirq);
+ return 0;
+ }
xen_allocate_pirq_msi((type == PCI_CAP_ID_MSIX) ?
- "msi-x" : "msi", &irq, &pirq);
+ "msi-x" : "msi", &irq, &pirq, (XEN_ALLOC_IRQ | XEN_ALLOC_PIRQ));
if (irq < 0 || pirq < 0)
goto error;
printk(KERN_DEBUG "xen: msi --> irq=%d, pirq=%d\n", irq, pirq);
@@ -147,8 +160,10 @@ static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
irq = xen_allocate_pirq(v[i], 0, /* not sharable */
(type == PCI_CAP_ID_MSIX) ?
"pcifront-msi-x" : "pcifront-msi");
- if (irq < 0)
- return -1;
+ if (irq < 0) {
+ ret = -1;
+ goto free;
+ }
ret = set_irq_msi(irq, msidesc);
if (ret)
@@ -164,7 +179,7 @@ error:
if (ret == -ENODEV)
dev_err(&dev->dev, "Xen PCI frontend has not registered" \
" MSI/MSI-X support!\n");
-
+free:
kfree(v);
return ret;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.