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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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b5401a96b5
The frontend stub lives in arch/x86/pci/xen.c, alongside other sub-arch PCI init code (e.g. olpc.c). It provides a mechanism for Xen PCI frontend to setup/destroy legacy interrupts, MSI/MSI-X, and PCI configuration operations. [ Impact: add core of Xen PCI support ] [ v2: Removed the IOMMU code and only focusing on PCI.] [ v3: removed usage of pci_scan_all_fns as that does not exist] [ v4: introduced pci_xen value to fix compile warnings] [ v5: squished fixes+features in one patch, changed Reviewed-by to Ccs] [ v7: added Acked-by] Signed-off-by: Alex Nixon <alex.nixon@citrix.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Matthew Wilcox <willy@linux.intel.com> Cc: Qing He <qing.he@intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: x86@kernel.org
148 lines
3.0 KiB
C
148 lines
3.0 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/pci_x86.h>
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#include <asm/xen/hypervisor.h>
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#include <xen/events.h>
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#include <asm/xen/pci.h>
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#if defined(CONFIG_PCI_MSI)
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#include <linux/msi.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 (!xen_initial_domain()) {
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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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}
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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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return -1;
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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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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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/* Only do this when were are in non-privileged mode.*/
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if (!xen_initial_domain()) {
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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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}
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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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#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_ISAPNP
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/* Stop isapnp from probing */
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isapnp_disable = 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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