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9fa5780bee
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>
48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
#include <linux/pci.h>
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#include <linux/usb.h>
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#include <linux/usb/ehci_def.h>
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#include <linux/usb/hcd.h>
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#include <asm/xen/hypercall.h>
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#include <xen/interface/physdev.h>
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#include <xen/xen.h>
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static int xen_dbgp_op(struct usb_hcd *hcd, int op)
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{
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const struct device *ctrlr = hcd_to_bus(hcd)->controller;
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struct physdev_dbgp_op dbgp;
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if (!xen_initial_domain())
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return 0;
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dbgp.op = op;
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#ifdef CONFIG_PCI
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if (ctrlr->bus == &pci_bus_type) {
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const struct pci_dev *pdev = to_pci_dev(ctrlr);
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dbgp.u.pci.seg = pci_domain_nr(pdev->bus);
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dbgp.u.pci.bus = pdev->bus->number;
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dbgp.u.pci.devfn = pdev->devfn;
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dbgp.bus = PHYSDEVOP_DBGP_BUS_PCI;
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} else
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#endif
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dbgp.bus = PHYSDEVOP_DBGP_BUS_UNKNOWN;
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return HYPERVISOR_physdev_op(PHYSDEVOP_dbgp_op, &dbgp);
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}
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int xen_dbgp_reset_prep(struct usb_hcd *hcd)
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{
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return xen_dbgp_op(hcd, PHYSDEVOP_DBGP_RESET_PREPARE);
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}
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int xen_dbgp_external_startup(struct usb_hcd *hcd)
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{
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return xen_dbgp_op(hcd, PHYSDEVOP_DBGP_RESET_DONE);
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}
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#ifndef CONFIG_EARLY_PRINTK_DBGP
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#include <linux/export.h>
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EXPORT_SYMBOL_GPL(xen_dbgp_reset_prep);
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EXPORT_SYMBOL_GPL(xen_dbgp_external_startup);
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#endif
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