linux/drivers/usb/core
Thomas Zimmermann 659ab7a49c drm: Use USB controller's DMA mask when importing dmabufs
USB devices cannot perform DMA and hence have no dma_mask set in their
device structure. Therefore importing dmabuf into a USB-based driver
fails, which breaks joining and mirroring of display in X11.

For USB devices, pick the associated USB controller as attachment device.
This allows the DRM import helpers to perform the DMA setup. If the DMA
controller does not support DMA transfers, we're out of luck and cannot
import. Our current USB-based DRM drivers don't use DMA, so the actual
DMA device is not important.

Tested by joining/mirroring displays of udl and radeon under Gnome/X11.

v8:
	* release dmadev if device initialization fails (Noralf)
	* fix commit description (Noralf)
v7:
	* fix use-before-init bug in gm12u320 (Dan)
v6:
	* implement workaround in DRM drivers and hold reference to
	  DMA device while USB device is in use
	* remove dev_is_usb() (Greg)
	* collapse USB helper into usb_intf_get_dma_device() (Alan)
	* integrate Daniel's TODO statement (Daniel)
	* fix typos (Greg)
v5:
	* provide a helper for USB interfaces (Alan)
	* add FIXME item to documentation and TODO list (Daniel)
v4:
	* implement workaround with USB helper functions (Greg)
	* use struct usb_device->bus->sysdev as DMA device (Takashi)
v3:
	* drop gem_create_object
	* use DMA mask of USB controller, if any (Daniel, Christian, Noralf)
v2:
	* move fix to importer side (Christian, Daniel)
	* update SHMEM and CMA helpers for new PRIME callbacks

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Fixes: 6eb0233ec2 ("usb: don't inherity DMA properties for USB devices")
Tested-by: Pavel Machek <pavel@ucw.cz>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Christian König <christian.koenig@amd.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Noralf Trønnes <noralf@tronnes.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: <stable@vger.kernel.org> # v5.10+
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20210303133229.3288-1-tzimmermann@suse.de
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
2021-03-11 11:11:33 +01:00
..
buffer.c usb: core: Replace in_interrupt() in comments 2020-10-28 12:32:59 +01:00
config.c usb: fix a few cases of -Wfallthrough 2020-11-13 15:20:52 +01:00
devices.c USB: core: remove polling for /sys/kernel/debug/usb/devices 2020-10-02 15:32:46 +02:00
devio.c USB: core: Change %pK for __user pointers to %px 2020-11-20 16:36:31 +01:00
driver.c usbcore: Check both id_table and match() when both available 2020-10-28 13:24:58 +01:00
endpoint.c USB: core: Constify static attribute_group structs 2020-11-26 13:40:42 +01:00
file.c USB: core: Fix races in character device registration and deregistraion 2019-08-12 22:47:24 +02:00
generic.c usbcore: Check both id_table and match() when both available 2020-10-28 13:24:58 +01:00
hcd-pci.c usb: core: Replace in_interrupt() in comments 2020-10-28 12:32:59 +01:00
hcd.c kbuild: simplify access to the kernel's version 2021-02-16 12:01:45 +09:00
hub.c usb: core: Replace in_interrupt() in comments 2020-10-28 12:32:59 +01:00
hub.h USB: core: Use the correct style for SPDX License Identifier 2020-04-16 14:32:45 +02:00
Kconfig USB: hub: Add Kconfig option to reduce number of port initialization retries 2020-10-02 11:29:02 +02:00
ledtrig-usbport.c usb: core: ledtrig-usbport: Demote obvious misuse of kerneldoc to standard comment blocks 2020-07-09 16:46:57 +02:00
Makefile usb: core: add a wrapper for the USB PHYs on the HCD 2018-03-09 09:43:53 -08:00
message.c USB: core: drop pipe-type check from new control-message helpers 2020-12-07 15:23:24 +01:00
notify.c USB: core: Remove usbfs_mutex 2019-06-26 10:28:09 +08:00
of.c drivers: usb: Fix trivial spelling 2020-06-18 10:13:16 +02:00
otg_productlist.h USB: OTG: rename product list of devices 2020-06-19 08:58:55 +02:00
phy.c usb: core: phy: add support for PHY calibration 2019-09-03 15:54:55 +02:00
phy.h usb: core: phy: add support for PHY calibration 2019-09-03 15:54:55 +02:00
port.c USB: core: Constify static attribute_group structs 2020-11-26 13:40:42 +01:00
quirks.c usb: quirks: add quirk to start video capture on ELMO L-12F document camera reliable 2021-02-10 15:59:27 +01:00
sysfs.c USB: core: Constify static attribute_group structs 2020-11-26 13:40:42 +01:00
urb.c USB: move snd_usb_pipe_sanity_check into the USB core 2020-09-16 11:02:23 +02:00
usb-acpi.c usb: core: Use ACPI_SUCCESS() at appropriate places 2020-02-19 11:08:52 +01:00
usb.c drm: Use USB controller's DMA mask when importing dmabufs 2021-03-11 11:11:33 +01:00
usb.h usbcore: Check both id_table and match() when both available 2020-10-28 13:24:58 +01:00