430 lines
9.3 KiB
C
430 lines
9.3 KiB
C
/*
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* Xen PCI Frontend Stub - puts some "dummy" functions in to the Linux
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* x86 PCI core to support the Xen PCI Frontend
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*
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* Author: Ryan Wilson <hap9@epoch.ncsc.mil>
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/acpi.h>
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#include <linux/io.h>
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#include <asm/io_apic.h>
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#include <asm/pci_x86.h>
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#include <asm/xen/hypervisor.h>
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#include <xen/features.h>
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#include <xen/events.h>
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#include <asm/xen/pci.h>
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#ifdef CONFIG_ACPI
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static int xen_hvm_register_pirq(u32 gsi, int triggering)
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{
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int rc, irq;
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struct physdev_map_pirq map_irq;
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int shareable = 0;
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char *name;
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if (!xen_hvm_domain())
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return -1;
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map_irq.domid = DOMID_SELF;
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map_irq.type = MAP_PIRQ_TYPE_GSI;
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map_irq.index = gsi;
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map_irq.pirq = -1;
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rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
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if (rc) {
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printk(KERN_WARNING "xen map irq failed %d\n", rc);
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return -1;
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}
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if (triggering == ACPI_EDGE_SENSITIVE) {
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shareable = 0;
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name = "ioapic-edge";
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} else {
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shareable = 1;
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name = "ioapic-level";
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}
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irq = xen_map_pirq_gsi(map_irq.pirq, gsi, shareable, name);
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printk(KERN_DEBUG "xen: --> irq=%d, pirq=%d\n", irq, map_irq.pirq);
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return irq;
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}
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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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{
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return xen_hvm_register_pirq(gsi, trigger);
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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, ret = 0;
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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 (xen_irq_from_pirq(pirq) >= 0 && msg.data == XEN_PIRQ_MSI_DATA) {
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xen_allocate_pirq_msi((type == PCI_CAP_ID_MSIX) ?
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"msi-x" : "msi", &irq, &pirq, XEN_ALLOC_IRQ);
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if (irq < 0)
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goto error;
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ret = set_irq_msi(irq, msidesc);
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if (ret < 0)
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goto error_while;
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printk(KERN_DEBUG "xen: msi already setup: msi --> irq=%d"
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" pirq=%d\n", irq, pirq);
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return 0;
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}
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xen_allocate_pirq_msi((type == PCI_CAP_ID_MSIX) ?
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"msi-x" : "msi", &irq, &pirq, (XEN_ALLOC_IRQ | XEN_ALLOC_PIRQ));
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if (irq < 0 || pirq < 0)
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goto error;
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printk(KERN_DEBUG "xen: msi --> irq=%d, pirq=%d\n", irq, pirq);
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xen_msi_compose_msg(dev, pirq, &msg);
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ret = set_irq_msi(irq, msidesc);
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if (ret < 0)
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goto error_while;
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write_msi_msg(irq, &msg);
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}
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return 0;
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error_while:
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unbind_from_irqhandler(irq, NULL);
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error:
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if (ret == -ENODEV)
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dev_err(&dev->dev, "Xen PCI frontend has not registered" \
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" MSI/MSI-X support!\n");
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return ret;
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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_allocate_pirq(v[i], 0, /* not sharable */
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(type == PCI_CAP_ID_MSIX) ?
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"pcifront-msi-x" : "pcifront-msi");
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if (irq < 0) {
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ret = -1;
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goto free;
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}
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ret = set_irq_msi(irq, msidesc);
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if (ret)
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goto error_while;
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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_while:
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unbind_from_irqhandler(irq, NULL);
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error:
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if (ret == -ENODEV)
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dev_err(&dev->dev, "Xen PCI frontend has not registered" \
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" 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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}
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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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static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
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{
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int irq, ret;
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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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irq = xen_create_msi_irq(dev, msidesc, type);
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if (irq < 0)
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return -1;
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ret = set_irq_msi(irq, msidesc);
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if (ret)
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goto error;
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}
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return 0;
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error:
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xen_destroy_irq(irq);
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return ret;
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}
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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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dev_info(&dev->dev, "Xen PCI enabling IRQ: %d\n", dev->irq);
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if (dev->irq < 0)
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return -EINVAL;
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if (dev->irq < NR_IRQS_LEGACY)
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share = 0;
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rc = xen_allocate_pirq(dev->irq, share, "pcifront");
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if (rc < 0) {
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dev_warn(&dev->dev, "Xen PCI IRQ: %d, failed to register:%d\n",
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dev->irq, rc);
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return rc;
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}
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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 triggering)
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{
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int rc, irq;
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struct physdev_map_pirq map_irq;
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int shareable = 0;
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char *name;
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if (!xen_pv_domain())
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return -1;
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if (triggering == ACPI_EDGE_SENSITIVE) {
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shareable = 0;
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name = "ioapic-edge";
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} else {
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shareable = 1;
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name = "ioapic-level";
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}
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irq = xen_allocate_pirq(gsi, shareable, name);
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printk(KERN_DEBUG "xen: --> irq=%d\n", irq);
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if (irq < 0)
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goto out;
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map_irq.domid = DOMID_SELF;
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map_irq.type = MAP_PIRQ_TYPE_GSI;
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map_irq.index = gsi;
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map_irq.pirq = irq;
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rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
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if (rc) {
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printk(KERN_WARNING "xen map irq failed %d\n", rc);
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return -1;
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}
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out:
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return irq;
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}
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static int xen_register_gsi(u32 gsi, int triggering, int polarity)
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{
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int rc, irq;
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struct physdev_setup_gsi setup_gsi;
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if (!xen_pv_domain())
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return -1;
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printk(KERN_DEBUG "xen: registering gsi %u triggering %d polarity %d\n",
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gsi, triggering, polarity);
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irq = xen_register_pirq(gsi, triggering);
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setup_gsi.gsi = gsi;
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setup_gsi.triggering = (triggering == ACPI_EDGE_SENSITIVE ? 0 : 1);
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setup_gsi.polarity = (polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
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rc = HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi);
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if (rc == -EEXIST)
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printk(KERN_INFO "Already setup the GSI :%d\n", gsi);
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else if (rc) {
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printk(KERN_ERR "Failed to setup GSI :%d, err_code:%d\n",
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gsi, rc);
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}
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return irq;
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}
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static __init void xen_setup_acpi_sci(void)
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{
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int rc;
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int trigger, polarity;
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int gsi = acpi_sci_override_gsi;
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if (!gsi)
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return;
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rc = acpi_get_override_irq(gsi, &trigger, &polarity);
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if (rc) {
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printk(KERN_WARNING "xen: acpi_get_override_irq failed for acpi"
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" sci, rc=%d\n", rc);
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return;
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}
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trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
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polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
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printk(KERN_INFO "xen: sci override: global_irq=%d trigger=%d "
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"polarity=%d\n", gsi, trigger, polarity);
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gsi = xen_register_gsi(gsi, trigger, polarity);
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printk(KERN_INFO "xen: acpi sci %d\n", gsi);
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return;
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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, trigger, polarity);
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}
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static int __init pci_xen_initial_domain(void)
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{
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#ifdef CONFIG_PCI_MSI
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x86_msi.setup_msi_irqs = xen_initdom_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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xen_setup_acpi_sci();
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__acpi_register_gsi = acpi_register_gsi_xen;
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return 0;
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}
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void __init xen_setup_pirqs(void)
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{
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int irq;
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pci_xen_initial_domain();
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if (0 == nr_ioapics) {
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for (irq = 0; irq < NR_IRQS_LEGACY; irq++)
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xen_allocate_pirq(irq, 0, "xt-pic");
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return;
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}
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/* Pre-allocate legacy irqs */
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for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
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int trigger, polarity;
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if (acpi_get_override_irq(irq, &trigger, &polarity) == -1)
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continue;
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xen_register_pirq(irq,
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trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE);
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}
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}
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#endif
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