xen/pci: Shuffle code around.
The file is hard to read. Move the code around so that the contents of it follows a uniform format: - setup GSIs - PV, HVM, and initial domain case - then MSI/MSI-x setup - PV, HVM and then initial domain case. - then MSI/MSI-x teardown - same order. - lastly, the __init functions in PV, HVM, and initial domain order. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Konrad Rzeszutek Wilk
Родитель
075d9db131
Коммит
fef6e26208
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@ -19,6 +19,43 @@
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#include <xen/events.h>
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#include <asm/xen/pci.h>
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static int xen_pcifront_enable_irq(struct pci_dev *dev)
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{
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int rc;
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int share = 1;
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int pirq;
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u8 gsi;
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rc = pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &gsi);
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if (rc < 0) {
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dev_warn(&dev->dev, "Xen PCI: failed to read interrupt line: %d\n",
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rc);
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return rc;
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}
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rc = xen_allocate_pirq_gsi(gsi);
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if (rc < 0) {
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dev_warn(&dev->dev, "Xen PCI: failed to allocate a PIRQ for GSI%d: %d\n",
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gsi, rc);
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return rc;
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}
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pirq = rc;
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if (gsi < NR_IRQS_LEGACY)
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share = 0;
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rc = xen_bind_pirq_gsi_to_irq(gsi, pirq, share, "pcifront");
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if (rc < 0) {
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dev_warn(&dev->dev, "Xen PCI: failed to bind GSI%d (PIRQ%d) to IRQ: %d\n",
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gsi, pirq, rc);
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return rc;
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}
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dev->irq = rc;
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dev_info(&dev->dev, "Xen PCI mapped GSI%d to IRQ%d\n", gsi, dev->irq);
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return 0;
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}
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#ifdef CONFIG_ACPI
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static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
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int trigger, int polarity)
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@ -58,274 +95,6 @@ static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
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}
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#endif
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#if defined(CONFIG_PCI_MSI)
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#include <linux/msi.h>
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#include <asm/msidef.h>
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struct xen_pci_frontend_ops *xen_pci_frontend;
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EXPORT_SYMBOL_GPL(xen_pci_frontend);
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#define XEN_PIRQ_MSI_DATA (MSI_DATA_TRIGGER_EDGE | \
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MSI_DATA_LEVEL_ASSERT | (3 << 8) | MSI_DATA_VECTOR(0))
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static void xen_msi_compose_msg(struct pci_dev *pdev, unsigned int pirq,
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struct msi_msg *msg)
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{
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/* We set vector == 0 to tell the hypervisor we don't care about it,
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* but we want a pirq setup instead.
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* We use the dest_id field to pass the pirq that we want. */
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msg->address_hi = MSI_ADDR_BASE_HI | MSI_ADDR_EXT_DEST_ID(pirq);
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msg->address_lo =
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MSI_ADDR_BASE_LO |
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MSI_ADDR_DEST_MODE_PHYSICAL |
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MSI_ADDR_REDIRECTION_CPU |
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MSI_ADDR_DEST_ID(pirq);
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msg->data = XEN_PIRQ_MSI_DATA;
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}
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static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
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{
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int irq, pirq;
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struct msi_desc *msidesc;
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struct msi_msg msg;
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list_for_each_entry(msidesc, &dev->msi_list, list) {
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__read_msi_msg(msidesc, &msg);
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pirq = MSI_ADDR_EXT_DEST_ID(msg.address_hi) |
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((msg.address_lo >> MSI_ADDR_DEST_ID_SHIFT) & 0xff);
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if (msg.data != XEN_PIRQ_MSI_DATA ||
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xen_irq_from_pirq(pirq) < 0) {
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pirq = xen_allocate_pirq_msi(dev, msidesc);
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if (pirq < 0)
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goto error;
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xen_msi_compose_msg(dev, pirq, &msg);
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__write_msi_msg(msidesc, &msg);
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dev_dbg(&dev->dev, "xen: msi bound to pirq=%d\n", pirq);
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} else {
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dev_dbg(&dev->dev,
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"xen: msi already bound to pirq=%d\n", pirq);
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}
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irq = xen_bind_pirq_msi_to_irq(dev, msidesc, pirq, 0,
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(type == PCI_CAP_ID_MSIX) ?
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"msi-x" : "msi",
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DOMID_SELF);
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if (irq < 0)
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goto error;
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dev_dbg(&dev->dev,
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"xen: msi --> pirq=%d --> irq=%d\n", pirq, irq);
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}
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return 0;
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error:
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dev_err(&dev->dev,
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"Xen PCI frontend has not registered MSI/MSI-X support!\n");
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return -ENODEV;
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}
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/*
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* For MSI interrupts we have to use drivers/xen/event.s functions to
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* allocate an irq_desc and setup the right */
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static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
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{
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int irq, ret, i;
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struct msi_desc *msidesc;
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int *v;
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v = kzalloc(sizeof(int) * max(1, nvec), GFP_KERNEL);
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if (!v)
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return -ENOMEM;
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if (type == PCI_CAP_ID_MSIX)
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ret = xen_pci_frontend_enable_msix(dev, v, nvec);
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else
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ret = xen_pci_frontend_enable_msi(dev, v);
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if (ret)
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goto error;
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i = 0;
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list_for_each_entry(msidesc, &dev->msi_list, list) {
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irq = xen_bind_pirq_msi_to_irq(dev, msidesc, v[i], 0,
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(type == PCI_CAP_ID_MSIX) ?
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"pcifront-msi-x" :
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"pcifront-msi",
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DOMID_SELF);
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if (irq < 0)
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goto free;
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i++;
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}
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kfree(v);
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return 0;
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error:
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dev_err(&dev->dev, "Xen PCI frontend has not registered MSI/MSI-X support!\n");
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free:
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kfree(v);
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return ret;
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}
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static void xen_teardown_msi_irqs(struct pci_dev *dev)
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{
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struct msi_desc *msidesc;
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msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
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if (msidesc->msi_attrib.is_msix)
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xen_pci_frontend_disable_msix(dev);
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else
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xen_pci_frontend_disable_msi(dev);
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/* Free the IRQ's and the msidesc using the generic code. */
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default_teardown_msi_irqs(dev);
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}
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static void xen_teardown_msi_irq(unsigned int irq)
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{
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xen_destroy_irq(irq);
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}
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#ifdef CONFIG_XEN_DOM0
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static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
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{
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int ret = 0;
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struct msi_desc *msidesc;
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list_for_each_entry(msidesc, &dev->msi_list, list) {
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struct physdev_map_pirq map_irq;
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domid_t domid;
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domid = ret = xen_find_device_domain_owner(dev);
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/* N.B. Casting int's -ENODEV to uint16_t results in 0xFFED,
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* hence check ret value for < 0. */
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if (ret < 0)
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domid = DOMID_SELF;
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memset(&map_irq, 0, sizeof(map_irq));
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map_irq.domid = domid;
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map_irq.type = MAP_PIRQ_TYPE_MSI;
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map_irq.index = -1;
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map_irq.pirq = -1;
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map_irq.bus = dev->bus->number;
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map_irq.devfn = dev->devfn;
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if (type == PCI_CAP_ID_MSIX) {
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int pos;
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u32 table_offset, bir;
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pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
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pci_read_config_dword(dev, pos + PCI_MSIX_TABLE,
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&table_offset);
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bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK);
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map_irq.table_base = pci_resource_start(dev, bir);
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map_irq.entry_nr = msidesc->msi_attrib.entry_nr;
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}
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ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
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if (ret) {
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dev_warn(&dev->dev, "xen map irq failed %d for %d domain\n",
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ret, domid);
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goto out;
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}
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ret = xen_bind_pirq_msi_to_irq(dev, msidesc,
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map_irq.pirq, map_irq.index,
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(type == PCI_CAP_ID_MSIX) ?
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"msi-x" : "msi",
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domid);
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if (ret < 0)
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goto out;
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}
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ret = 0;
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out:
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return ret;
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}
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#endif
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#endif
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static int xen_pcifront_enable_irq(struct pci_dev *dev)
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{
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int rc;
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int share = 1;
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int pirq;
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u8 gsi;
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rc = pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &gsi);
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if (rc < 0) {
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dev_warn(&dev->dev, "Xen PCI: failed to read interrupt line: %d\n",
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rc);
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return rc;
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}
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rc = xen_allocate_pirq_gsi(gsi);
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if (rc < 0) {
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dev_warn(&dev->dev, "Xen PCI: failed to allocate a PIRQ for GSI%d: %d\n",
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gsi, rc);
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return rc;
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}
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pirq = rc;
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if (gsi < NR_IRQS_LEGACY)
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share = 0;
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rc = xen_bind_pirq_gsi_to_irq(gsi, pirq, share, "pcifront");
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if (rc < 0) {
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dev_warn(&dev->dev, "Xen PCI: failed to bind GSI%d (PIRQ%d) to IRQ: %d\n",
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gsi, pirq, rc);
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return rc;
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}
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dev->irq = rc;
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dev_info(&dev->dev, "Xen PCI mapped GSI%d to IRQ%d\n", gsi, dev->irq);
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return 0;
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}
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int __init pci_xen_init(void)
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{
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if (!xen_pv_domain() || xen_initial_domain())
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return -ENODEV;
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printk(KERN_INFO "PCI: setting up Xen PCI frontend stub\n");
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pcibios_set_cache_line_size();
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pcibios_enable_irq = xen_pcifront_enable_irq;
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pcibios_disable_irq = NULL;
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#ifdef CONFIG_ACPI
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/* Keep ACPI out of the picture */
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acpi_noirq = 1;
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#endif
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#ifdef CONFIG_PCI_MSI
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x86_msi.setup_msi_irqs = xen_setup_msi_irqs;
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x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
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x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs;
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#endif
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return 0;
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}
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int __init pci_xen_hvm_init(void)
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{
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if (!xen_feature(XENFEAT_hvm_pirqs))
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return 0;
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#ifdef CONFIG_ACPI
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/*
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* We don't want to change the actual ACPI delivery model,
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* just how GSIs get registered.
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*/
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__acpi_register_gsi = acpi_register_gsi_xen_hvm;
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#endif
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#ifdef CONFIG_PCI_MSI
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x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs;
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x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
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#endif
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return 0;
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}
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#ifdef CONFIG_XEN_DOM0
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static int xen_register_pirq(u32 gsi, int gsi_override, int triggering)
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{
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@ -400,6 +169,245 @@ static int xen_register_gsi(u32 gsi, int gsi_override, int triggering, int polar
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return irq;
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}
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static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
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int trigger, int polarity)
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{
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return xen_register_gsi(gsi, -1 /* no GSI override */, trigger, polarity);
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}
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#endif
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#if defined(CONFIG_PCI_MSI)
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#include <linux/msi.h>
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#include <asm/msidef.h>
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struct xen_pci_frontend_ops *xen_pci_frontend;
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EXPORT_SYMBOL_GPL(xen_pci_frontend);
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/*
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* For MSI interrupts we have to use drivers/xen/event.s functions to
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* allocate an irq_desc and setup the right */
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static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
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{
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int irq, ret, i;
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struct msi_desc *msidesc;
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int *v;
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v = kzalloc(sizeof(int) * max(1, nvec), GFP_KERNEL);
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if (!v)
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return -ENOMEM;
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if (type == PCI_CAP_ID_MSIX)
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ret = xen_pci_frontend_enable_msix(dev, v, nvec);
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else
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ret = xen_pci_frontend_enable_msi(dev, v);
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if (ret)
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goto error;
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i = 0;
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list_for_each_entry(msidesc, &dev->msi_list, list) {
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irq = xen_bind_pirq_msi_to_irq(dev, msidesc, v[i], 0,
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(type == PCI_CAP_ID_MSIX) ?
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"pcifront-msi-x" :
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"pcifront-msi",
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DOMID_SELF);
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if (irq < 0)
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goto free;
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i++;
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}
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kfree(v);
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return 0;
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error:
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dev_err(&dev->dev, "Xen PCI frontend has not registered MSI/MSI-X support!\n");
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free:
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kfree(v);
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return ret;
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}
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#define XEN_PIRQ_MSI_DATA (MSI_DATA_TRIGGER_EDGE | \
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MSI_DATA_LEVEL_ASSERT | (3 << 8) | MSI_DATA_VECTOR(0))
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static void xen_msi_compose_msg(struct pci_dev *pdev, unsigned int pirq,
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struct msi_msg *msg)
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{
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/* We set vector == 0 to tell the hypervisor we don't care about it,
|
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* but we want a pirq setup instead.
|
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* We use the dest_id field to pass the pirq that we want. */
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msg->address_hi = MSI_ADDR_BASE_HI | MSI_ADDR_EXT_DEST_ID(pirq);
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msg->address_lo =
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MSI_ADDR_BASE_LO |
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MSI_ADDR_DEST_MODE_PHYSICAL |
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MSI_ADDR_REDIRECTION_CPU |
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MSI_ADDR_DEST_ID(pirq);
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msg->data = XEN_PIRQ_MSI_DATA;
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}
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|
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static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
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{
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int irq, pirq;
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struct msi_desc *msidesc;
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struct msi_msg msg;
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list_for_each_entry(msidesc, &dev->msi_list, list) {
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__read_msi_msg(msidesc, &msg);
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pirq = MSI_ADDR_EXT_DEST_ID(msg.address_hi) |
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((msg.address_lo >> MSI_ADDR_DEST_ID_SHIFT) & 0xff);
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if (msg.data != XEN_PIRQ_MSI_DATA ||
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xen_irq_from_pirq(pirq) < 0) {
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pirq = xen_allocate_pirq_msi(dev, msidesc);
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if (pirq < 0)
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goto error;
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xen_msi_compose_msg(dev, pirq, &msg);
|
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__write_msi_msg(msidesc, &msg);
|
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dev_dbg(&dev->dev, "xen: msi bound to pirq=%d\n", pirq);
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} else {
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dev_dbg(&dev->dev,
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"xen: msi already bound to pirq=%d\n", pirq);
|
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}
|
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irq = xen_bind_pirq_msi_to_irq(dev, msidesc, pirq, 0,
|
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(type == PCI_CAP_ID_MSIX) ?
|
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"msi-x" : "msi",
|
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DOMID_SELF);
|
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if (irq < 0)
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goto error;
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||||
dev_dbg(&dev->dev,
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"xen: msi --> pirq=%d --> irq=%d\n", pirq, irq);
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}
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return 0;
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|
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error:
|
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dev_err(&dev->dev,
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"Xen PCI frontend has not registered MSI/MSI-X support!\n");
|
||||
return -ENODEV;
|
||||
}
|
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|
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#ifdef CONFIG_XEN_DOM0
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static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
|
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{
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int ret = 0;
|
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struct msi_desc *msidesc;
|
||||
|
||||
list_for_each_entry(msidesc, &dev->msi_list, list) {
|
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struct physdev_map_pirq map_irq;
|
||||
domid_t domid;
|
||||
|
||||
domid = ret = xen_find_device_domain_owner(dev);
|
||||
/* N.B. Casting int's -ENODEV to uint16_t results in 0xFFED,
|
||||
* hence check ret value for < 0. */
|
||||
if (ret < 0)
|
||||
domid = DOMID_SELF;
|
||||
|
||||
memset(&map_irq, 0, sizeof(map_irq));
|
||||
map_irq.domid = domid;
|
||||
map_irq.type = MAP_PIRQ_TYPE_MSI;
|
||||
map_irq.index = -1;
|
||||
map_irq.pirq = -1;
|
||||
map_irq.bus = dev->bus->number;
|
||||
map_irq.devfn = dev->devfn;
|
||||
|
||||
if (type == PCI_CAP_ID_MSIX) {
|
||||
int pos;
|
||||
u32 table_offset, bir;
|
||||
|
||||
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
|
||||
|
||||
pci_read_config_dword(dev, pos + PCI_MSIX_TABLE,
|
||||
&table_offset);
|
||||
bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK);
|
||||
|
||||
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);
|
||||
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);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
}
|
||||
ret = 0;
|
||||
out:
|
||||
return ret;
|
||||
}
|
||||
#endif
|
||||
|
||||
static void xen_teardown_msi_irqs(struct pci_dev *dev)
|
||||
{
|
||||
struct msi_desc *msidesc;
|
||||
|
||||
msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
|
||||
if (msidesc->msi_attrib.is_msix)
|
||||
xen_pci_frontend_disable_msix(dev);
|
||||
else
|
||||
xen_pci_frontend_disable_msi(dev);
|
||||
|
||||
/* Free the IRQ's and the msidesc using the generic code. */
|
||||
default_teardown_msi_irqs(dev);
|
||||
}
|
||||
|
||||
static void xen_teardown_msi_irq(unsigned int irq)
|
||||
{
|
||||
xen_destroy_irq(irq);
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
|
||||
int __init pci_xen_init(void)
|
||||
{
|
||||
if (!xen_pv_domain() || xen_initial_domain())
|
||||
return -ENODEV;
|
||||
|
||||
printk(KERN_INFO "PCI: setting up Xen PCI frontend stub\n");
|
||||
|
||||
pcibios_set_cache_line_size();
|
||||
|
||||
pcibios_enable_irq = xen_pcifront_enable_irq;
|
||||
pcibios_disable_irq = NULL;
|
||||
|
||||
#ifdef CONFIG_ACPI
|
||||
/* Keep ACPI out of the picture */
|
||||
acpi_noirq = 1;
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_PCI_MSI
|
||||
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;
|
||||
#endif
|
||||
return 0;
|
||||
}
|
||||
|
||||
int __init pci_xen_hvm_init(void)
|
||||
{
|
||||
if (!xen_feature(XENFEAT_hvm_pirqs))
|
||||
return 0;
|
||||
|
||||
#ifdef CONFIG_ACPI
|
||||
/*
|
||||
* We don't want to change the actual ACPI delivery model,
|
||||
* just how GSIs get registered.
|
||||
*/
|
||||
__acpi_register_gsi = acpi_register_gsi_xen_hvm;
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_PCI_MSI
|
||||
x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs;
|
||||
x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
|
||||
#endif
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_XEN_DOM0
|
||||
static __init void xen_setup_acpi_sci(void)
|
||||
{
|
||||
int rc;
|
||||
|
|
@ -447,12 +455,6 @@ static __init void xen_setup_acpi_sci(void)
|
|||
return;
|
||||
}
|
||||
|
||||
static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
|
||||
int trigger, int polarity)
|
||||
{
|
||||
return xen_register_gsi(gsi, -1 /* no GSI override */, trigger, polarity);
|
||||
}
|
||||
|
||||
static int __init pci_xen_initial_domain(void)
|
||||
{
|
||||
#ifdef CONFIG_PCI_MSI
|
||||
|
|
@ -493,9 +495,7 @@ void __init xen_setup_pirqs(void)
|
|||
trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE);
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_XEN_DOM0
|
||||
struct xen_device_domain_owner {
|
||||
domid_t domain;
|
||||
struct pci_dev *dev;
|
||||
|
|
|
|||
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