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USB EHCI/Xen: propagate controller reset information to hypervisor

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Just like for the in-tree early console debug port driver, the
hypervisor - when using a debug port based console - also needs to be
told about controller resets, so it can suppress using and then
re-initialize the debug port accordingly.

Other than the in-tree driver, the hypervisor driver actually cares
about doing this only for the device where the debug is port actually
in use, i.e. it needs to be told the coordinates of the device being
reset (quite obviously, leveraging the addition done for that would
likely benefit the in-tree driver too).

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jan Beulich
2012-09-18 12:23:02 +01:00
committed by Greg Kroah-Hartman
parent ee42f6c9fc
commit 9fa5780bee
7 changed files with 106 additions and 16 deletions
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drivers/xen/dbgp.c
+48
View File
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#include <linux/pci.h>
#include <linux/usb.h>
#include <linux/usb/ehci_def.h>
#include <linux/usb/hcd.h>
#include <asm/xen/hypercall.h>
#include <xen/interface/physdev.h>
#include <xen/xen.h>
static int xen_dbgp_op(struct usb_hcd *hcd, int op)
{
const struct device *ctrlr = hcd_to_bus(hcd)->controller;
struct physdev_dbgp_op dbgp;
if (!xen_initial_domain())
return 0;
dbgp.op = op;
#ifdef CONFIG_PCI
if (ctrlr->bus == &pci_bus_type) {
const struct pci_dev *pdev = to_pci_dev(ctrlr);
dbgp.u.pci.seg = pci_domain_nr(pdev->bus);
dbgp.u.pci.bus = pdev->bus->number;
dbgp.u.pci.devfn = pdev->devfn;
dbgp.bus = PHYSDEVOP_DBGP_BUS_PCI;
} else
#endif
dbgp.bus = PHYSDEVOP_DBGP_BUS_UNKNOWN;
return HYPERVISOR_physdev_op(PHYSDEVOP_dbgp_op, &dbgp);
}
int xen_dbgp_reset_prep(struct usb_hcd *hcd)
{
return xen_dbgp_op(hcd, PHYSDEVOP_DBGP_RESET_PREPARE);
}
int xen_dbgp_external_startup(struct usb_hcd *hcd)
{
return xen_dbgp_op(hcd, PHYSDEVOP_DBGP_RESET_DONE);
}
#ifndef CONFIG_EARLY_PRINTK_DBGP
#include <linux/export.h>
EXPORT_SYMBOL_GPL(xen_dbgp_reset_prep);
EXPORT_SYMBOL_GPL(xen_dbgp_external_startup);
#endif