v4.19.13 snapshot.
diff --git a/drivers/xen/platform-pci.c b/drivers/xen/platform-pci.c
new file mode 100644
index 0000000..5d7dcad
--- /dev/null
+++ b/drivers/xen/platform-pci.c
@@ -0,0 +1,193 @@
+/******************************************************************************
+ * platform-pci.c
+ *
+ * Xen platform PCI device driver
+ *
+ * Authors: ssmith@xensource.com and stefano.stabellini@eu.citrix.com
+ *
+ * Copyright (c) 2005, Intel Corporation.
+ * Copyright (c) 2007, XenSource Inc.
+ * Copyright (c) 2010, Citrix
+ *
+ * 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.
+ *
+ */
+
+
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+
+#include <xen/platform_pci.h>
+#include <xen/grant_table.h>
+#include <xen/xenbus.h>
+#include <xen/events.h>
+#include <xen/hvm.h>
+#include <xen/xen-ops.h>
+
+#define DRV_NAME "xen-platform-pci"
+
+static unsigned long platform_mmio;
+static unsigned long platform_mmio_alloc;
+static unsigned long platform_mmiolen;
+static uint64_t callback_via;
+
+static unsigned long alloc_xen_mmio(unsigned long len)
+{
+ unsigned long addr;
+
+ addr = platform_mmio + platform_mmio_alloc;
+ platform_mmio_alloc += len;
+ BUG_ON(platform_mmio_alloc > platform_mmiolen);
+
+ return addr;
+}
+
+static uint64_t get_callback_via(struct pci_dev *pdev)
+{
+ u8 pin;
+ int irq;
+
+ irq = pdev->irq;
+ if (irq < 16)
+ return irq; /* ISA IRQ */
+
+ pin = pdev->pin;
+
+ /* We don't know the GSI. Specify the PCI INTx line instead. */
+ return ((uint64_t)0x01 << HVM_CALLBACK_VIA_TYPE_SHIFT) | /* PCI INTx identifier */
+ ((uint64_t)pci_domain_nr(pdev->bus) << 32) |
+ ((uint64_t)pdev->bus->number << 16) |
+ ((uint64_t)(pdev->devfn & 0xff) << 8) |
+ ((uint64_t)(pin - 1) & 3);
+}
+
+static irqreturn_t do_hvm_evtchn_intr(int irq, void *dev_id)
+{
+ xen_hvm_evtchn_do_upcall();
+ return IRQ_HANDLED;
+}
+
+static int xen_allocate_irq(struct pci_dev *pdev)
+{
+ return request_irq(pdev->irq, do_hvm_evtchn_intr,
+ IRQF_NOBALANCING | IRQF_TRIGGER_RISING,
+ "xen-platform-pci", pdev);
+}
+
+static int platform_pci_resume(struct pci_dev *pdev)
+{
+ int err;
+
+ if (xen_have_vector_callback)
+ return 0;
+
+ err = xen_set_callback_via(callback_via);
+ if (err) {
+ dev_err(&pdev->dev, "platform_pci_resume failure!\n");
+ return err;
+ }
+ return 0;
+}
+
+static int platform_pci_probe(struct pci_dev *pdev,
+ const struct pci_device_id *ent)
+{
+ int i, ret;
+ long ioaddr;
+ long mmio_addr, mmio_len;
+ unsigned int max_nr_gframes;
+ unsigned long grant_frames;
+
+ if (!xen_domain())
+ return -ENODEV;
+
+ i = pci_enable_device(pdev);
+ if (i)
+ return i;
+
+ ioaddr = pci_resource_start(pdev, 0);
+
+ mmio_addr = pci_resource_start(pdev, 1);
+ mmio_len = pci_resource_len(pdev, 1);
+
+ if (mmio_addr == 0 || ioaddr == 0) {
+ dev_err(&pdev->dev, "no resources found\n");
+ ret = -ENOENT;
+ goto pci_out;
+ }
+
+ ret = pci_request_region(pdev, 1, DRV_NAME);
+ if (ret < 0)
+ goto pci_out;
+
+ ret = pci_request_region(pdev, 0, DRV_NAME);
+ if (ret < 0)
+ goto mem_out;
+
+ platform_mmio = mmio_addr;
+ platform_mmiolen = mmio_len;
+ if (!xen_have_vector_callback) {
+ ret = xen_allocate_irq(pdev);
+ if (ret) {
+ dev_warn(&pdev->dev, "request_irq failed err=%d\n", ret);
+ goto out;
+ }
+ callback_via = get_callback_via(pdev);
+ ret = xen_set_callback_via(callback_via);
+ if (ret) {
+ dev_warn(&pdev->dev, "Unable to set the evtchn callback "
+ "err=%d\n", ret);
+ goto out;
+ }
+ }
+
+ max_nr_gframes = gnttab_max_grant_frames();
+ grant_frames = alloc_xen_mmio(PAGE_SIZE * max_nr_gframes);
+ ret = gnttab_setup_auto_xlat_frames(grant_frames);
+ if (ret)
+ goto out;
+ ret = gnttab_init();
+ if (ret)
+ goto grant_out;
+ xenbus_probe(NULL);
+ return 0;
+grant_out:
+ gnttab_free_auto_xlat_frames();
+out:
+ pci_release_region(pdev, 0);
+mem_out:
+ pci_release_region(pdev, 1);
+pci_out:
+ pci_disable_device(pdev);
+ return ret;
+}
+
+static const struct pci_device_id platform_pci_tbl[] = {
+ {PCI_VENDOR_ID_XEN, PCI_DEVICE_ID_XEN_PLATFORM,
+ PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+ {0,}
+};
+
+static struct pci_driver platform_driver = {
+ .name = DRV_NAME,
+ .probe = platform_pci_probe,
+ .id_table = platform_pci_tbl,
+#ifdef CONFIG_PM
+ .resume_early = platform_pci_resume,
+#endif
+};
+
+builtin_pci_driver(platform_driver);