mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Stefano Stabellini](/assets/img/avatar_default.png)
Now that xenstore_ready is used correctly for PV on HVM guests too, we don't need to delay the initialization of xen_setup_shutdown_event anymore. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: Jeremy Fitzhardinge <jeremy@goop.org>
197 lines
4.7 KiB
C
197 lines
4.7 KiB
C
/******************************************************************************
|
|
* platform-pci.c
|
|
*
|
|
* Xen platform PCI device driver
|
|
* 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/module.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"
|
|
|
|
MODULE_AUTHOR("ssmith@xensource.com and stefano.stabellini@eu.citrix.com");
|
|
MODULE_DESCRIPTION("Xen platform PCI device");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static unsigned long platform_mmio;
|
|
static unsigned long platform_mmio_alloc;
|
|
static unsigned long platform_mmiolen;
|
|
static uint64_t callback_via;
|
|
|
|
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 << 56) | /* 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_DISABLED | 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 __devinit platform_pci_init(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;
|
|
|
|
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();
|
|
xen_hvm_resume_frames = alloc_xen_mmio(PAGE_SIZE * max_nr_gframes);
|
|
ret = gnttab_init();
|
|
if (ret)
|
|
goto out;
|
|
xenbus_probe(NULL);
|
|
return 0;
|
|
|
|
out:
|
|
pci_release_region(pdev, 0);
|
|
mem_out:
|
|
pci_release_region(pdev, 1);
|
|
pci_out:
|
|
pci_disable_device(pdev);
|
|
return ret;
|
|
}
|
|
|
|
static struct pci_device_id platform_pci_tbl[] __devinitdata = {
|
|
{PCI_VENDOR_ID_XEN, PCI_DEVICE_ID_XEN_PLATFORM,
|
|
PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
|
|
{0,}
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(pci, platform_pci_tbl);
|
|
|
|
static struct pci_driver platform_driver = {
|
|
.name = DRV_NAME,
|
|
.probe = platform_pci_init,
|
|
.id_table = platform_pci_tbl,
|
|
#ifdef CONFIG_PM
|
|
.resume_early = platform_pci_resume,
|
|
#endif
|
|
};
|
|
|
|
static int __init platform_pci_module_init(void)
|
|
{
|
|
/* no unplug has been done, IGNORE hasn't been specified: just
|
|
* return now */
|
|
if (!xen_platform_pci_unplug)
|
|
return -ENODEV;
|
|
|
|
return pci_register_driver(&platform_driver);
|
|
}
|
|
|
|
module_init(platform_pci_module_init);
|