mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-09 08:46:43 +07:00
5bba6c56dc
This looks to be vestigial dependency that had never been used even in the original code base (2.6.18) from which this driver was up-ported. Without this fix, with the CONFIG_ISAPNP, we get this compile failure: arch/x86/pci/xen.c: In function 'pci_xen_init': arch/x86/pci/xen.c:138: error: 'isapnp_disable' undeclared (first use in this function) arch/x86/pci/xen.c:138: error: (Each undeclared identifier is reported only once arch/x86/pci/xen.c:138: error: for each function it appears in.) Reported-by: Li Zefan <lizf@cn.fujitsu.com> Tested-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
143 lines
2.9 KiB
C
143 lines
2.9 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_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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