/* * EHCI HCD (Host Controller Driver) for USB. * * Bus Glue for Xilinx EHCI core on the of_platform bus * * Copyright (c) 2009 Xilinx, Inc. * * Based on "ehci-ppc-of.c" by Valentine Barshak * and "ehci-ppc-soc.c" by Stefan Roese * and "ohci-ppc-of.c" by Sylvain Munaut * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * This program is distributed in the hope that 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., 675 Mass Ave, Cambridge, MA 02139, USA. * */ #include #include #include #include #include #include /** * ehci_xilinx_port_handed_over - hand the port out if failed to enable it * @hcd: Pointer to the usb_hcd device to which the host controller bound * @portnum:Port number to which the device is attached. * * This function is used as a place to tell the user that the Xilinx USB host * controller does support LS devices. And in an HS only configuration, it * does not support FS devices either. It is hoped that this can help a * confused user. * * There are cases when the host controller fails to enable the port due to, * for example, insufficient power that can be supplied to the device from * the USB bus. In those cases, the messages printed here are not helpful. */ static int ehci_xilinx_port_handed_over(struct usb_hcd *hcd, int portnum) { dev_warn(hcd->self.controller, "port %d cannot be enabled\n", portnum); if (hcd->has_tt) { dev_warn(hcd->self.controller, "Maybe you have connected a low speed device?\n"); dev_warn(hcd->self.controller, "We do not support low speed devices\n"); } else { dev_warn(hcd->self.controller, "Maybe your device is not a high speed device?\n"); dev_warn(hcd->self.controller, "The USB host controller does not support full speed " "nor low speed devices\n"); dev_warn(hcd->self.controller, "You can reconfigure the host controller to have " "full speed support\n"); } return 0; } static const struct hc_driver ehci_xilinx_of_hc_driver = { .description = hcd_name, .product_desc = "OF EHCI", .hcd_priv_size = sizeof(struct ehci_hcd), /* * generic hardware linkage */ .irq = ehci_irq, .flags = HCD_MEMORY | HCD_USB2 | HCD_BH, /* * basic lifecycle operations */ .reset = ehci_setup, .start = ehci_run, .stop = ehci_stop, .shutdown = ehci_shutdown, /* * managing i/o requests and associated device resources */ .urb_enqueue = ehci_urb_enqueue, .urb_dequeue = ehci_urb_dequeue, .endpoint_disable = ehci_endpoint_disable, .endpoint_reset = ehci_endpoint_reset, /* * scheduling support */ .get_frame_number = ehci_get_frame, /* * root hub support */ .hub_status_data = ehci_hub_status_data, .hub_control = ehci_hub_control, #ifdef CONFIG_PM .bus_suspend = ehci_bus_suspend, .bus_resume = ehci_bus_resume, #endif .relinquish_port = NULL, .port_handed_over = ehci_xilinx_port_handed_over, .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, }; /** * ehci_hcd_xilinx_of_probe - Probe method for the USB host controller * @op: pointer to the platform_device bound to the host controller * * This function requests resources and sets up appropriate properties for the * host controller. Because the Xilinx USB host controller can be configured * as HS only or HS/FS only, it checks the configuration in the device tree * entry, and sets an appropriate value for hcd->has_tt. */ static int ehci_hcd_xilinx_of_probe(struct platform_device *op) { struct device_node *dn = op->dev.of_node; struct usb_hcd *hcd; struct ehci_hcd *ehci; struct resource res; int irq; int rv; int *value; if (usb_disabled()) return -ENODEV; dev_dbg(&op->dev, "initializing XILINX-OF USB Controller\n"); rv = of_address_to_resource(dn, 0, &res); if (rv) return rv; hcd = usb_create_hcd(&ehci_xilinx_of_hc_driver, &op->dev, "XILINX-OF USB"); if (!hcd) return -ENOMEM; hcd->rsrc_start = res.start; hcd->rsrc_len = resource_size(&res); irq = irq_of_parse_and_map(dn, 0); if (!irq) { dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n", __FILE__); rv = -EBUSY; goto err_irq; } hcd->regs = devm_ioremap_resource(&op->dev, &res); if (IS_ERR(hcd->regs)) { rv = PTR_ERR(hcd->regs); goto err_irq; } ehci = hcd_to_ehci(hcd); /* This core always has big-endian register interface and uses * big-endian memory descriptors. */ ehci->big_endian_mmio = 1; ehci->big_endian_desc = 1; /* Check whether the FS support option is selected in the hardware. */ value = (int *)of_get_property(dn, "xlnx,support-usb-fs", NULL); if (value && (*value == 1)) { ehci_dbg(ehci, "USB host controller supports FS devices\n"); hcd->has_tt = 1; } else { ehci_dbg(ehci, "USB host controller is HS only\n"); hcd->has_tt = 0; } /* Debug registers are at the first 0x100 region */ ehci->caps = hcd->regs + 0x100; rv = usb_add_hcd(hcd, irq, 0); if (rv == 0) { device_wakeup_enable(hcd->self.controller); return 0; } err_irq: usb_put_hcd(hcd); return rv; } /** * ehci_hcd_xilinx_of_remove - shutdown hcd and release resources * @op: pointer to platform_device structure that is to be removed * * Remove the hcd structure, and release resources that has been requested * during probe. */ static int ehci_hcd_xilinx_of_remove(struct platform_device *op) { struct usb_hcd *hcd = platform_get_drvdata(op); dev_dbg(&op->dev, "stopping XILINX-OF USB Controller\n"); usb_remove_hcd(hcd); usb_put_hcd(hcd); return 0; } static const struct of_device_id ehci_hcd_xilinx_of_match[] = { {.compatible = "xlnx,xps-usb-host-1.00.a",}, {}, }; MODULE_DEVICE_TABLE(of, ehci_hcd_xilinx_of_match); static struct platform_driver ehci_hcd_xilinx_of_driver = { .probe = ehci_hcd_xilinx_of_probe, .remove = ehci_hcd_xilinx_of_remove, .shutdown = usb_hcd_platform_shutdown, .driver = { .name = "xilinx-of-ehci", .of_match_table = ehci_hcd_xilinx_of_match, }, }; rm/i915: Check for NULL i915_vma in intel_unpin_fb_obj()
I've seen this trigger twice now, where the i915_gem_object_to_ggtt() call in intel_unpin_fb_obj() returns NULL, resulting in an oops immediately afterwards as the (inlined) call to i915_vma_unpin_fence() tries to dereference it. It seems to be some race condition where the object is going away at shutdown time, since both times happened when shutting down the X server. The call chains were different: - VT ioctl(KDSETMODE, KD_TEXT): intel_cleanup_plane_fb+0x5b/0xa0 [i915] drm_atomic_helper_cleanup_planes+0x6f/0x90 [drm_kms_helper] intel_atomic_commit_tail+0x749/0xfe0 [i915] intel_atomic_commit+0x3cb/0x4f0 [i915] drm_atomic_commit+0x4b/0x50 [drm] restore_fbdev_mode+0x14c/0x2a0 [drm_kms_helper] drm_fb_helper_restore_fbdev_mode_unlocked+0x34/0x80 [drm_kms_helper] drm_fb_helper_set_par+0x2d/0x60 [drm_kms_helper] intel_fbdev_set_par+0x18/0x70 [i915] fb_set_var+0x236/0x460 fbcon_blank+0x30f/0x350 do_unblank_screen+0xd2/0x1a0 vt_ioctl+0x507/0x12a0 tty_ioctl+0x355/0xc30 do_vfs_ioctl+0xa3/0x5e0 SyS_ioctl+0x79/0x90 entry_SYSCALL_64_fastpath+0x13/0x94 - i915 unpin_work workqueue: intel_unpin_work_fn+0x58/0x140 [i915] process_one_work+0x1f1/0x480 worker_thread+0x48/0x4d0 kthread+0x101/0x140 and this patch purely papers over the issue by adding a NULL pointer check and a WARN_ON_ONCE() to avoid the oops that would then generally make the machine unresponsive. Other callers of i915_gem_object_to_ggtt() seem to also check for the returned pointer being NULL and warn about it, so this clearly has happened before in other places. [ Reported it originally to the i915 developers on Jan 8, applying the ugly workaround on my own now after triggering the problem for the second time with no feedback. This is likely to be the same bug reported as https://bugs.freedesktop.org/show_bug.cgi?id=98829 https://bugs.freedesktop.org/show_bug.cgi?id=99134 which has a patch for the underlying problem, but it hasn't gotten to me, so I'm applying the workaround. ] Cc: Daniel Vetter <daniel.vetter@intel.com> Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Imre Deak <imre.deak@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'sound/synth/emux/Makefile')