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Date: Thu, 15 Mar 2012 12:29:39 -0400
From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To: Stephen Rothwell <sfr@...b.auug.org.au>
Cc: Greg KH <greg@...ah.com>, linux-next@...r.kernel.org,
linux-kernel@...r.kernel.org, Alan Cox <alan@...ux.intel.com>,
Stefano Stabellini <stefano.stabellini@...citrix.com>
Subject: Re: linux-next: manual merge of the tty tree with the xen-two tree
On Thu, Mar 15, 2012 at 04:37:40PM +1100, Stephen Rothwell wrote:
> Hi Greg,
>
> Today's linux-next merge of the tty tree got a conflict in
> drivers/tty/hvc/hvc_xen.c between commits 02e19f9c7cac ("hvc_xen:
> implement multiconsole support") and cf8e019b523a ("hvc_xen: introduce
> HVC_XEN_FRONTEND") from the xen-two tree and commit d4e33fac2408
> ("serial: Kill off NO_IRQ") from the tty tree.
>
> The code was moved around. I fixed it up (see below) and can carry the
> fix as necessary.
Please do. Thanks!
> --
> Cheers,
> Stephen Rothwell sfr@...b.auug.org.au
>
> diff --cc drivers/tty/hvc/hvc_xen.c
> index 83d5c88,a1b0a75..0000000
> --- a/drivers/tty/hvc/hvc_xen.c
> +++ b/drivers/tty/hvc/hvc_xen.c
> @@@ -299,262 -193,8 +299,262 @@@ static int xen_initial_domain_console_i
>
> void xen_console_resume(void)
> {
> - if (xencons_irq)
> - rebind_evtchn_irq(xen_start_info->console.domU.evtchn, xencons_irq);
> + struct xencons_info *info = vtermno_to_xencons(HVC_COOKIE);
> + if (info != NULL && info->irq)
> + rebind_evtchn_irq(info->evtchn, info->irq);
> +}
> +
> +static void xencons_disconnect_backend(struct xencons_info *info)
> +{
> + if (info->irq > 0)
> + unbind_from_irqhandler(info->irq, NULL);
> + info->irq = 0;
> + if (info->evtchn > 0)
> + xenbus_free_evtchn(info->xbdev, info->evtchn);
> + info->evtchn = 0;
> + if (info->gntref > 0)
> + gnttab_free_grant_references(info->gntref);
> + info->gntref = 0;
> + if (info->hvc != NULL)
> + hvc_remove(info->hvc);
> + info->hvc = NULL;
> +}
> +
> +static void xencons_free(struct xencons_info *info)
> +{
> + free_page((unsigned long)info->intf);
> + info->intf = NULL;
> + info->vtermno = 0;
> + kfree(info);
> +}
> +
> +static int xen_console_remove(struct xencons_info *info)
> +{
> + xencons_disconnect_backend(info);
> + spin_lock(&xencons_lock);
> + list_del(&info->list);
> + spin_unlock(&xencons_lock);
> + if (info->xbdev != NULL)
> + xencons_free(info);
> + else {
> + if (xen_hvm_domain())
> + iounmap(info->intf);
> + kfree(info);
> + }
> + return 0;
> +}
> +
> +#ifdef CONFIG_HVC_XEN_FRONTEND
> +static struct xenbus_driver xencons_driver;
> +
> +static int xencons_remove(struct xenbus_device *dev)
> +{
> + return xen_console_remove(dev_get_drvdata(&dev->dev));
> +}
> +
> +static int xencons_connect_backend(struct xenbus_device *dev,
> + struct xencons_info *info)
> +{
> + int ret, evtchn, devid, ref, irq;
> + struct xenbus_transaction xbt;
> + grant_ref_t gref_head;
> + unsigned long mfn;
> +
> + ret = xenbus_alloc_evtchn(dev, &evtchn);
> + if (ret)
> + return ret;
> + info->evtchn = evtchn;
> + irq = bind_evtchn_to_irq(evtchn);
> + if (irq < 0)
> + return irq;
> + info->irq = irq;
> + devid = dev->nodename[strlen(dev->nodename) - 1] - '0';
> + info->hvc = hvc_alloc(xenbus_devid_to_vtermno(devid),
> + irq, &domU_hvc_ops, 256);
> + if (IS_ERR(info->hvc))
> + return PTR_ERR(info->hvc);
> + if (xen_pv_domain())
> + mfn = virt_to_mfn(info->intf);
> + else
> + mfn = __pa(info->intf) >> PAGE_SHIFT;
> + ret = gnttab_alloc_grant_references(1, &gref_head);
> + if (ret < 0)
> + return ret;
> + info->gntref = gref_head;
> + ref = gnttab_claim_grant_reference(&gref_head);
> + if (ref < 0)
> + return ref;
> + gnttab_grant_foreign_access_ref(ref, info->xbdev->otherend_id,
> + mfn, 0);
> +
> + again:
> + ret = xenbus_transaction_start(&xbt);
> + if (ret) {
> + xenbus_dev_fatal(dev, ret, "starting transaction");
> + return ret;
> + }
> + ret = xenbus_printf(xbt, dev->nodename, "ring-ref", "%d", ref);
> + if (ret)
> + goto error_xenbus;
> + ret = xenbus_printf(xbt, dev->nodename, "port", "%u",
> + evtchn);
> + if (ret)
> + goto error_xenbus;
> + ret = xenbus_printf(xbt, dev->nodename, "type", "ioemu");
> + if (ret)
> + goto error_xenbus;
> + ret = xenbus_transaction_end(xbt, 0);
> + if (ret) {
> + if (ret == -EAGAIN)
> + goto again;
> + xenbus_dev_fatal(dev, ret, "completing transaction");
> + return ret;
> + }
> +
> + xenbus_switch_state(dev, XenbusStateInitialised);
> + return 0;
> +
> + error_xenbus:
> + xenbus_transaction_end(xbt, 1);
> + xenbus_dev_fatal(dev, ret, "writing xenstore");
> + return ret;
> +}
> +
> +static int __devinit xencons_probe(struct xenbus_device *dev,
> + const struct xenbus_device_id *id)
> +{
> + int ret, devid;
> + struct xencons_info *info;
> +
> + devid = dev->nodename[strlen(dev->nodename) - 1] - '0';
> + if (devid == 0)
> + return -ENODEV;
> +
> + info = kzalloc(sizeof(struct xencons_info), GFP_KERNEL | __GFP_ZERO);
> + if (!info)
> + goto error_nomem;
> + dev_set_drvdata(&dev->dev, info);
> + info->xbdev = dev;
> + info->vtermno = xenbus_devid_to_vtermno(devid);
> + info->intf = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
> + if (!info->intf)
> + goto error_nomem;
> +
> + ret = xencons_connect_backend(dev, info);
> + if (ret < 0)
> + goto error;
> + spin_lock(&xencons_lock);
> + list_add_tail(&info->list, &xenconsoles);
> + spin_unlock(&xencons_lock);
> +
> + return 0;
> +
> + error_nomem:
> + ret = -ENOMEM;
> + xenbus_dev_fatal(dev, ret, "allocating device memory");
> + error:
> + xencons_disconnect_backend(info);
> + xencons_free(info);
> + return ret;
> +}
> +
> +static int xencons_resume(struct xenbus_device *dev)
> +{
> + struct xencons_info *info = dev_get_drvdata(&dev->dev);
> +
> + xencons_disconnect_backend(info);
> + memset(info->intf, 0, PAGE_SIZE);
> + return xencons_connect_backend(dev, info);
> +}
> +
> +static void xencons_backend_changed(struct xenbus_device *dev,
> + enum xenbus_state backend_state)
> +{
> + switch (backend_state) {
> + case XenbusStateReconfiguring:
> + case XenbusStateReconfigured:
> + case XenbusStateInitialising:
> + case XenbusStateInitialised:
> + case XenbusStateUnknown:
> + case XenbusStateClosed:
> + break;
> +
> + case XenbusStateInitWait:
> + break;
> +
> + case XenbusStateConnected:
> + xenbus_switch_state(dev, XenbusStateConnected);
> + break;
> +
> + case XenbusStateClosing:
> + xenbus_frontend_closed(dev);
> + break;
> + }
> +}
> +
> +static const struct xenbus_device_id xencons_ids[] = {
> + { "console" },
> + { "" }
> +};
> +
> +
> +static DEFINE_XENBUS_DRIVER(xencons, "xenconsole",
> + .probe = xencons_probe,
> + .remove = xencons_remove,
> + .resume = xencons_resume,
> + .otherend_changed = xencons_backend_changed,
> +);
> +#endif /* CONFIG_HVC_XEN_FRONTEND */
> +
> +static int __init xen_hvc_init(void)
> +{
> + int r;
> + struct xencons_info *info;
> + const struct hv_ops *ops;
> +
> + if (!xen_domain())
> + return -ENODEV;
> +
> + if (xen_initial_domain()) {
> + ops = &dom0_hvc_ops;
> + r = xen_initial_domain_console_init();
> + if (r < 0)
> + return r;
> + info = vtermno_to_xencons(HVC_COOKIE);
> + } else {
> + ops = &domU_hvc_ops;
> + if (xen_hvm_domain())
> + r = xen_hvm_console_init();
> + else
> + r = xen_pv_console_init();
> + if (r < 0)
> + return r;
> +
> + info = vtermno_to_xencons(HVC_COOKIE);
> + info->irq = bind_evtchn_to_irq(info->evtchn);
> + }
> + if (info->irq < 0)
> - info->irq = 0; /* NO_IRQ */
> ++ info->irq = 0;
> + else
> + irq_set_noprobe(info->irq);
> +
> + info->hvc = hvc_alloc(HVC_COOKIE, info->irq, ops, 256);
> + if (IS_ERR(info->hvc)) {
> + r = PTR_ERR(info->hvc);
> + spin_lock(&xencons_lock);
> + list_del(&info->list);
> + spin_unlock(&xencons_lock);
> + if (info->irq)
> + unbind_from_irqhandler(info->irq, NULL);
> + kfree(info);
> + return r;
> + }
> +
> + r = 0;
> +#ifdef CONFIG_HVC_XEN_FRONTEND
> + r = xenbus_register_frontend(&xencons_driver);
> +#endif
> + return r;
> }
>
> static void __exit xen_hvc_fini(void)
--
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