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b9136d207f
When xen_emul_unplug=never is specified on kernel command line reading files from /sys/hypervisor is broken (returns -EBUSY). It is caused by xen_bus dependency on platform-pci and platform-pci isn't initialized when xen_emul_unplug=never is specified. Fix it by allowing platform-pci to ignore xen_emul_unplug=never, and do not intialize xen_[blk|net]front instead. Signed-off-by: Igor Mammedov <imammedo@redhat.com> Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
193 lines
4.6 KiB
C
193 lines
4.6 KiB
C
/******************************************************************************
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* platform-pci.c
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*
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* Xen platform PCI device driver
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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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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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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/module.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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MODULE_AUTHOR("ssmith@xensource.com and stefano.stabellini@eu.citrix.com");
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MODULE_DESCRIPTION("Xen platform PCI device");
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MODULE_LICENSE("GPL");
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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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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 << 56) | /* 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_DISABLED | 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 __devinit platform_pci_init(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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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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xen_hvm_resume_frames = alloc_xen_mmio(PAGE_SIZE * max_nr_gframes);
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ret = gnttab_init();
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if (ret)
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goto out;
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xenbus_probe(NULL);
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return 0;
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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 struct pci_device_id platform_pci_tbl[] __devinitdata = {
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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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MODULE_DEVICE_TABLE(pci, platform_pci_tbl);
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static struct pci_driver platform_driver = {
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.name = DRV_NAME,
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.probe = platform_pci_init,
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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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static int __init platform_pci_module_init(void)
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{
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return pci_register_driver(&platform_driver);
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}
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module_init(platform_pci_module_init);
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