00f28e4037
This is the correct interface to use and something has broken the use of the previous incorrect interface (which fails because the request conflicts with the resources assigned for the PCI device itself instead of nesting like the PCI interfaces do). Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: stable@kernel.org # 2.6.37 only
201 lines
4.7 KiB
C
201 lines
4.7 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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ret = xen_setup_shutdown_event();
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if (ret)
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goto out;
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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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/* no unplug has been done, IGNORE hasn't been specified: just
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* return now */
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if (!xen_platform_pci_unplug)
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return -ENODEV;
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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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