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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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68c2c39a76
PV on HVM guests map GSIs into event channels. At restore time the event channels are resumed by restore_pirqs. Device drivers might try to register the same GSI again through ACPI at restore time, but the GSI has already been mapped and bound by restore_pirqs. This patch detects these situations and avoids mapping the same GSI multiple times. Without this patch we get: (XEN) irq.c:2235: dom4: pirq 23 or emuirq 28 already mapped and waste a pirq. CC: stable@kernel.org Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
574 lines
14 KiB
C
574 lines
14 KiB
C
/*
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* Xen PCI - handle PCI (INTx) and MSI infrastructure calls for PV, HVM and
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* initial domain support. We also handle the DSDT _PRT callbacks for GSI's
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* used in HVM and initial domain mode (PV does not parse ACPI, so it has no
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* concept of GSIs). Under PV we hook under the pnbbios API for IRQs and
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* 0xcf8 PCI configuration read/write.
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*
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* Author: Ryan Wilson <hap9@epoch.ncsc.mil>
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* Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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* Stefano Stabellini <stefano.stabellini@eu.citrix.com>
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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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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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/* In PV DomU the Xen PCI backend puts the PIRQ in the interrupt line.*/
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pirq = gsi;
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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 xen_register_pirq(u32 gsi, int gsi_override, int triggering,
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bool set_pirq)
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{
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int rc, pirq = -1, irq = -1;
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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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irq = xen_irq_from_gsi(gsi);
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if (irq > 0)
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return irq;
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if (set_pirq)
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pirq = gsi;
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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 = pirq;
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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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if (gsi_override >= 0)
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gsi = gsi_override;
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irq = xen_bind_pirq_gsi_to_irq(gsi, map_irq.pirq, shareable, name);
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if (irq < 0)
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goto out;
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printk(KERN_DEBUG "xen: --> pirq=%d -> irq=%d (gsi=%d)\n", map_irq.pirq, irq, gsi);
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out:
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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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if (!xen_hvm_domain())
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return -1;
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return xen_register_pirq(gsi, -1 /* no GSI override */, trigger,
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false /* no mapping of GSI to PIRQ */);
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}
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#ifdef CONFIG_XEN_DOM0
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static int xen_register_gsi(u32 gsi, int gsi_override, 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, gsi_override, triggering, true);
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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 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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#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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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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ret = irq;
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goto free;
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}
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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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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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irq = -ENODEV;
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goto error;
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}
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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 irq;
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}
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#ifdef CONFIG_XEN_DOM0
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static bool __read_mostly pci_seg_supported = true;
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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_SEG;
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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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(pci_domain_nr(dev->bus) << 16);
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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 = -EINVAL;
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if (pci_seg_supported)
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ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq,
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&map_irq);
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if (ret == -EINVAL && !pci_domain_nr(dev->bus)) {
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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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ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq,
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&map_irq);
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if (ret != -EINVAL)
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pci_seg_supported = false;
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}
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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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static void xen_initdom_restore_msi_irqs(struct pci_dev *dev, int irq)
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{
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int ret = 0;
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if (pci_seg_supported) {
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struct physdev_pci_device restore_ext;
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restore_ext.seg = pci_domain_nr(dev->bus);
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restore_ext.bus = dev->bus->number;
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restore_ext.devfn = dev->devfn;
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ret = HYPERVISOR_physdev_op(PHYSDEVOP_restore_msi_ext,
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&restore_ext);
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if (ret == -ENOSYS)
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pci_seg_supported = false;
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WARN(ret && ret != -ENOSYS, "restore_msi_ext -> %d\n", ret);
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}
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if (!pci_seg_supported) {
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struct physdev_restore_msi restore;
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restore.bus = dev->bus->number;
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restore.devfn = dev->devfn;
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ret = HYPERVISOR_physdev_op(PHYSDEVOP_restore_msi, &restore);
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WARN(ret && ret != -ENOSYS, "restore_msi -> %d\n", ret);
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}
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}
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#endif
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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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#endif
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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_have_vector_callback || !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 __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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int irq = -1;
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int gsi_override = -1;
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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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/* Before we bind the GSI to a Linux IRQ, check whether
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* we need to override it with bus_irq (IRQ) value. Usually for
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* IRQs below IRQ_LEGACY_IRQ this holds IRQ == GSI, as so:
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* ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 low level)
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* but there are oddballs where the IRQ != GSI:
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* ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 20 low level)
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* which ends up being: gsi_to_irq[9] == 20
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* (which is what acpi_gsi_to_irq ends up calling when starting the
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* the ACPI interpreter and keels over since IRQ 9 has not been
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* setup as we had setup IRQ 20 for it).
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*/
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if (acpi_gsi_to_irq(gsi, &irq) == 0) {
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/* Use the provided value if it's valid. */
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if (irq >= 0)
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gsi_override = irq;
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}
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gsi = xen_register_gsi(gsi, gsi_override, trigger, polarity);
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printk(KERN_INFO "xen: acpi sci %d\n", gsi);
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|
|
|
return;
|
|
}
|
|
|
|
int __init pci_xen_initial_domain(void)
|
|
{
|
|
int irq;
|
|
|
|
#ifdef CONFIG_PCI_MSI
|
|
x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs;
|
|
x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
|
|
x86_msi.restore_msi_irqs = xen_initdom_restore_msi_irqs;
|
|
#endif
|
|
xen_setup_acpi_sci();
|
|
__acpi_register_gsi = acpi_register_gsi_xen;
|
|
/* Pre-allocate legacy irqs */
|
|
for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
|
|
int trigger, polarity;
|
|
|
|
if (acpi_get_override_irq(irq, &trigger, &polarity) == -1)
|
|
continue;
|
|
|
|
xen_register_pirq(irq, -1 /* no GSI override */,
|
|
trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE,
|
|
true /* Map GSI to PIRQ */);
|
|
}
|
|
if (0 == nr_ioapics) {
|
|
for (irq = 0; irq < NR_IRQS_LEGACY; irq++)
|
|
xen_bind_pirq_gsi_to_irq(irq, irq, 0, "xt-pic");
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
struct xen_device_domain_owner {
|
|
domid_t domain;
|
|
struct pci_dev *dev;
|
|
struct list_head list;
|
|
};
|
|
|
|
static DEFINE_SPINLOCK(dev_domain_list_spinlock);
|
|
static struct list_head dev_domain_list = LIST_HEAD_INIT(dev_domain_list);
|
|
|
|
static struct xen_device_domain_owner *find_device(struct pci_dev *dev)
|
|
{
|
|
struct xen_device_domain_owner *owner;
|
|
|
|
list_for_each_entry(owner, &dev_domain_list, list) {
|
|
if (owner->dev == dev)
|
|
return owner;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
int xen_find_device_domain_owner(struct pci_dev *dev)
|
|
{
|
|
struct xen_device_domain_owner *owner;
|
|
int domain = -ENODEV;
|
|
|
|
spin_lock(&dev_domain_list_spinlock);
|
|
owner = find_device(dev);
|
|
if (owner)
|
|
domain = owner->domain;
|
|
spin_unlock(&dev_domain_list_spinlock);
|
|
return domain;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xen_find_device_domain_owner);
|
|
|
|
int xen_register_device_domain_owner(struct pci_dev *dev, uint16_t domain)
|
|
{
|
|
struct xen_device_domain_owner *owner;
|
|
|
|
owner = kzalloc(sizeof(struct xen_device_domain_owner), GFP_KERNEL);
|
|
if (!owner)
|
|
return -ENODEV;
|
|
|
|
spin_lock(&dev_domain_list_spinlock);
|
|
if (find_device(dev)) {
|
|
spin_unlock(&dev_domain_list_spinlock);
|
|
kfree(owner);
|
|
return -EEXIST;
|
|
}
|
|
owner->domain = domain;
|
|
owner->dev = dev;
|
|
list_add_tail(&owner->list, &dev_domain_list);
|
|
spin_unlock(&dev_domain_list_spinlock);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xen_register_device_domain_owner);
|
|
|
|
int xen_unregister_device_domain_owner(struct pci_dev *dev)
|
|
{
|
|
struct xen_device_domain_owner *owner;
|
|
|
|
spin_lock(&dev_domain_list_spinlock);
|
|
owner = find_device(dev);
|
|
if (!owner) {
|
|
spin_unlock(&dev_domain_list_spinlock);
|
|
return -ENODEV;
|
|
}
|
|
list_del(&owner->list);
|
|
spin_unlock(&dev_domain_list_spinlock);
|
|
kfree(owner);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xen_unregister_device_domain_owner);
|
|
#endif
|