Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 186 insertions, 0 deletions

diff --git a/drivers/xen/platform-pci.c b/drivers/xen/platform-pci.c
new file mode 100644
index 000000000..804d8f4d0
--- /dev/null
+++ b/drivers/xen/platform-pci.c
@@ -0,0 +1,186 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/******************************************************************************
+ * 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
+ */
+
+
+#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 device *dev)
+{
+	int err;
+
+	if (xen_have_vector_callback)
+		return 0;
+
+	err = xen_set_callback_via(callback_via);
+	if (err) {
+		dev_err(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 irq_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 irq_out;
+	ret = gnttab_init();
+	if (ret)
+		goto grant_out;
+	return 0;
+grant_out:
+	gnttab_free_auto_xlat_frames();
+irq_out:
+	if (!xen_have_vector_callback)
+		free_irq(pdev->irq, pdev);
+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 const struct dev_pm_ops platform_pm_ops = {
+	.resume_noirq =   platform_pci_resume,
+};
+
+static struct pci_driver platform_driver = {
+	.name =           DRV_NAME,
+	.probe =          platform_pci_probe,
+	.id_table =       platform_pci_tbl,
+	.driver = {
+		.pm =     &platform_pm_ops,
+	},
+};
+
+builtin_pci_driver(platform_driver);