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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 33 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190530000435.254582722@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
180 lines
3.9 KiB
C
180 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/******************************************************************************
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* platform-pci.c
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*
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* Xen platform PCI device driver
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*
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* Authors: ssmith@xensource.com and stefano.stabellini@eu.citrix.com
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*
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* Copyright (c) 2005, Intel Corporation.
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* Copyright (c) 2007, XenSource Inc.
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* Copyright (c) 2010, Citrix
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*/
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <xen/platform_pci.h>
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#include <xen/grant_table.h>
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#include <xen/xenbus.h>
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#include <xen/events.h>
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#include <xen/hvm.h>
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#include <xen/xen-ops.h>
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#define DRV_NAME "xen-platform-pci"
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static unsigned long platform_mmio;
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static unsigned long platform_mmio_alloc;
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static unsigned long platform_mmiolen;
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static uint64_t callback_via;
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static unsigned long alloc_xen_mmio(unsigned long len)
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{
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unsigned long addr;
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addr = platform_mmio + platform_mmio_alloc;
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platform_mmio_alloc += len;
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BUG_ON(platform_mmio_alloc > platform_mmiolen);
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return addr;
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}
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static uint64_t get_callback_via(struct pci_dev *pdev)
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{
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u8 pin;
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int irq;
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irq = pdev->irq;
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if (irq < 16)
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return irq; /* ISA IRQ */
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pin = pdev->pin;
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/* We don't know the GSI. Specify the PCI INTx line instead. */
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return ((uint64_t)0x01 << HVM_CALLBACK_VIA_TYPE_SHIFT) | /* PCI INTx identifier */
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((uint64_t)pci_domain_nr(pdev->bus) << 32) |
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((uint64_t)pdev->bus->number << 16) |
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((uint64_t)(pdev->devfn & 0xff) << 8) |
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((uint64_t)(pin - 1) & 3);
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}
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static irqreturn_t do_hvm_evtchn_intr(int irq, void *dev_id)
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{
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xen_hvm_evtchn_do_upcall();
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return IRQ_HANDLED;
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}
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static int xen_allocate_irq(struct pci_dev *pdev)
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{
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return request_irq(pdev->irq, do_hvm_evtchn_intr,
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IRQF_NOBALANCING | IRQF_TRIGGER_RISING,
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"xen-platform-pci", pdev);
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}
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static int platform_pci_resume(struct pci_dev *pdev)
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{
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int err;
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if (xen_have_vector_callback)
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return 0;
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err = xen_set_callback_via(callback_via);
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if (err) {
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dev_err(&pdev->dev, "platform_pci_resume failure!\n");
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return err;
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}
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return 0;
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}
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static int platform_pci_probe(struct pci_dev *pdev,
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const struct pci_device_id *ent)
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{
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int i, ret;
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long ioaddr;
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long mmio_addr, mmio_len;
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unsigned int max_nr_gframes;
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unsigned long grant_frames;
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if (!xen_domain())
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return -ENODEV;
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i = pci_enable_device(pdev);
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if (i)
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return i;
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ioaddr = pci_resource_start(pdev, 0);
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mmio_addr = pci_resource_start(pdev, 1);
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mmio_len = pci_resource_len(pdev, 1);
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if (mmio_addr == 0 || ioaddr == 0) {
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dev_err(&pdev->dev, "no resources found\n");
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ret = -ENOENT;
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goto pci_out;
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}
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ret = pci_request_region(pdev, 1, DRV_NAME);
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if (ret < 0)
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goto pci_out;
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ret = pci_request_region(pdev, 0, DRV_NAME);
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if (ret < 0)
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goto mem_out;
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platform_mmio = mmio_addr;
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platform_mmiolen = mmio_len;
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if (!xen_have_vector_callback) {
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ret = xen_allocate_irq(pdev);
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if (ret) {
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dev_warn(&pdev->dev, "request_irq failed err=%d\n", ret);
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goto out;
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}
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callback_via = get_callback_via(pdev);
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ret = xen_set_callback_via(callback_via);
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if (ret) {
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dev_warn(&pdev->dev, "Unable to set the evtchn callback "
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"err=%d\n", ret);
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goto out;
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}
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}
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max_nr_gframes = gnttab_max_grant_frames();
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grant_frames = alloc_xen_mmio(PAGE_SIZE * max_nr_gframes);
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ret = gnttab_setup_auto_xlat_frames(grant_frames);
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if (ret)
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goto out;
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ret = gnttab_init();
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if (ret)
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goto grant_out;
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xenbus_probe(NULL);
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return 0;
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grant_out:
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gnttab_free_auto_xlat_frames();
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out:
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pci_release_region(pdev, 0);
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mem_out:
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pci_release_region(pdev, 1);
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pci_out:
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pci_disable_device(pdev);
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return ret;
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}
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static const struct pci_device_id platform_pci_tbl[] = {
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{PCI_VENDOR_ID_XEN, PCI_DEVICE_ID_XEN_PLATFORM,
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PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
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{0,}
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};
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static struct pci_driver platform_driver = {
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.name = DRV_NAME,
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.probe = platform_pci_probe,
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.id_table = platform_pci_tbl,
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#ifdef CONFIG_PM
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.resume_early = platform_pci_resume,
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#endif
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};
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builtin_pci_driver(platform_driver);
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