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Diffstat (limited to 'drivers/xen/pci.c')
-rw-r--r--drivers/xen/pci.c237
1 files changed, 208 insertions, 29 deletions
diff --git a/drivers/xen/pci.c b/drivers/xen/pci.c
index 18fff88254eb..bfe07adb3e3a 100644
--- a/drivers/xen/pci.c
+++ b/drivers/xen/pci.c
@@ -1,24 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2009, Intel Corporation.
*
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
- * Place - Suite 330, Boston, MA 02111-1307 USA.
- *
* Author: Weidong Han <weidong.han@intel.com>
*/
#include <linux/pci.h>
#include <linux/acpi.h>
+#include <linux/pci-acpi.h>
+#include <xen/pci.h>
#include <xen/xen.h>
#include <xen/interface/physdev.h>
#include <xen/interface/xen.h>
@@ -26,6 +16,11 @@
#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>
#include "../pci/pci.h"
+#ifdef CONFIG_PCI_MMCONFIG
+#include <asm/pci_x86.h>
+
+static int xen_mcfg_late(void);
+#endif
static bool __read_mostly pci_seg_supported = true;
@@ -36,35 +31,69 @@ static int xen_add_device(struct device *dev)
#ifdef CONFIG_PCI_IOV
struct pci_dev *physfn = pci_dev->physfn;
#endif
+#ifdef CONFIG_PCI_MMCONFIG
+ static bool pci_mcfg_reserved = false;
+ /*
+ * Reserve MCFG areas in Xen on first invocation due to this being
+ * potentially called from inside of acpi_init immediately after
+ * MCFG table has been finally parsed.
+ */
+ if (!pci_mcfg_reserved) {
+ xen_mcfg_late();
+ pci_mcfg_reserved = true;
+ }
+#endif
+
+ if (pci_domain_nr(pci_dev->bus) >> 16) {
+ /*
+ * The hypercall interface is limited to 16bit PCI segment
+ * values, do not attempt to register devices with Xen in
+ * segments greater or equal than 0x10000.
+ */
+ dev_info(dev,
+ "not registering with Xen: invalid PCI segment\n");
+ return 0;
+ }
if (pci_seg_supported) {
- struct physdev_pci_device_add add = {
- .seg = pci_domain_nr(pci_dev->bus),
- .bus = pci_dev->bus->number,
- .devfn = pci_dev->devfn
- };
+ DEFINE_RAW_FLEX(struct physdev_pci_device_add, add, optarr, 1);
+
+ add->seg = pci_domain_nr(pci_dev->bus);
+ add->bus = pci_dev->bus->number;
+ add->devfn = pci_dev->devfn;
+
#ifdef CONFIG_ACPI
acpi_handle handle;
#endif
#ifdef CONFIG_PCI_IOV
if (pci_dev->is_virtfn) {
- add.flags = XEN_PCI_DEV_VIRTFN;
- add.physfn.bus = physfn->bus->number;
- add.physfn.devfn = physfn->devfn;
+ add->flags = XEN_PCI_DEV_VIRTFN;
+ add->physfn.bus = physfn->bus->number;
+ add->physfn.devfn = physfn->devfn;
} else
#endif
if (pci_ari_enabled(pci_dev->bus) && PCI_SLOT(pci_dev->devfn))
- add.flags = XEN_PCI_DEV_EXTFN;
+ add->flags = XEN_PCI_DEV_EXTFN;
#ifdef CONFIG_ACPI
- handle = DEVICE_ACPI_HANDLE(&pci_dev->dev);
- if (!handle && pci_dev->bus->bridge)
- handle = DEVICE_ACPI_HANDLE(pci_dev->bus->bridge);
+ handle = ACPI_HANDLE(&pci_dev->dev);
#ifdef CONFIG_PCI_IOV
if (!handle && pci_dev->is_virtfn)
- handle = DEVICE_ACPI_HANDLE(physfn->bus->bridge);
+ handle = ACPI_HANDLE(physfn->bus->bridge);
#endif
+ if (!handle) {
+ /*
+ * This device was not listed in the ACPI name space at
+ * all. Try to get acpi handle of parent pci bus.
+ */
+ struct pci_bus *pbus;
+ for (pbus = pci_dev->bus; pbus; pbus = pbus->parent) {
+ handle = acpi_pci_get_bridge_handle(pbus);
+ if (handle)
+ break;
+ }
+ }
if (handle) {
acpi_status status;
@@ -74,8 +103,8 @@ static int xen_add_device(struct device *dev)
status = acpi_evaluate_integer(handle, "_PXM",
NULL, &pxm);
if (ACPI_SUCCESS(status)) {
- add.optarr[0] = pxm;
- add.flags |= XEN_PCI_DEV_PXM;
+ add->optarr[0] = pxm;
+ add->flags |= XEN_PCI_DEV_PXM;
break;
}
status = acpi_get_parent(handle, &handle);
@@ -83,7 +112,7 @@ static int xen_add_device(struct device *dev)
}
#endif /* CONFIG_ACPI */
- r = HYPERVISOR_physdev_op(PHYSDEVOP_pci_device_add, &add);
+ r = HYPERVISOR_physdev_op(PHYSDEVOP_pci_device_add, add);
if (r != -ENOSYS)
return r;
pci_seg_supported = false;
@@ -132,6 +161,16 @@ static int xen_remove_device(struct device *dev)
int r;
struct pci_dev *pci_dev = to_pci_dev(dev);
+ if (pci_domain_nr(pci_dev->bus) >> 16) {
+ /*
+ * The hypercall interface is limited to 16bit PCI segment
+ * values.
+ */
+ dev_info(dev,
+ "not unregistering with Xen: invalid PCI segment\n");
+ return 0;
+ }
+
if (pci_seg_supported) {
struct physdev_pci_device device = {
.seg = pci_domain_nr(pci_dev->bus),
@@ -156,6 +195,29 @@ static int xen_remove_device(struct device *dev)
return r;
}
+int xen_reset_device(const struct pci_dev *dev)
+{
+ struct pci_device_reset device = {
+ .dev.seg = pci_domain_nr(dev->bus),
+ .dev.bus = dev->bus->number,
+ .dev.devfn = dev->devfn,
+ .flags = PCI_DEVICE_RESET_FLR,
+ };
+
+ if (pci_domain_nr(dev->bus) >> 16) {
+ /*
+ * The hypercall interface is limited to 16bit PCI segment
+ * values.
+ */
+ dev_info(&dev->dev,
+ "unable to notify Xen of device reset: invalid PCI segment\n");
+ return 0;
+ }
+
+ return HYPERVISOR_physdev_op(PHYSDEVOP_pci_device_reset, &device);
+}
+EXPORT_SYMBOL_GPL(xen_reset_device);
+
static int xen_pci_notifier(struct notifier_block *nb,
unsigned long action, void *data)
{
@@ -192,3 +254,120 @@ static int __init register_xen_pci_notifier(void)
}
arch_initcall(register_xen_pci_notifier);
+
+#ifdef CONFIG_PCI_MMCONFIG
+static int xen_mcfg_late(void)
+{
+ struct pci_mmcfg_region *cfg;
+ int rc;
+
+ if (!xen_initial_domain())
+ return 0;
+
+ if ((pci_probe & PCI_PROBE_MMCONF) == 0)
+ return 0;
+
+ if (list_empty(&pci_mmcfg_list))
+ return 0;
+
+ /* Check whether they are in the right area. */
+ list_for_each_entry(cfg, &pci_mmcfg_list, list) {
+ struct physdev_pci_mmcfg_reserved r;
+
+ r.address = cfg->address;
+ r.segment = cfg->segment;
+ r.start_bus = cfg->start_bus;
+ r.end_bus = cfg->end_bus;
+ r.flags = XEN_PCI_MMCFG_RESERVED;
+
+ rc = HYPERVISOR_physdev_op(PHYSDEVOP_pci_mmcfg_reserved, &r);
+ switch (rc) {
+ case 0:
+ case -ENOSYS:
+ continue;
+
+ default:
+ pr_warn("Failed to report MMCONFIG reservation"
+ " state for %s to hypervisor"
+ " (%d)\n",
+ cfg->name, rc);
+ }
+ }
+ return 0;
+}
+#endif
+
+#ifdef CONFIG_XEN_DOM0
+struct xen_device_domain_owner {
+ domid_t domain;
+ struct pci_dev *dev;
+ struct list_head list;
+};
+
+static DEFINE_SPINLOCK(dev_domain_list_spinlock);
+static LIST_HEAD(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
generated by cgit (git 2.34.1) at 2025-12-21 21:11:45 +0000