kernel/linux.git/arch/s390/include/asm/ccwdev.h, branch v6.12.80

driver core: have match() callback in struct bus_type take a const *

2024-07-03T13:16:54+00:00

In the match() callback, the struct device_driver * should not be changed, so change the function callback to be a const *. This is one step of many towards making the driver core safe to have struct device_driver in read-only memory. Because the match() callback is in all busses, all busses are modified to handle this properly. This does entail switching some container_of() calls to container_of_const() to properly handle the constant *. For some busses, like PCI and USB and HV, the const * is cast away in the match callback as those busses do want to modify those structures at this point in time (they have a local lock in the driver structure.) That will have to be changed in the future if they wish to have their struct device * in read-only-memory. Cc: Rafael J. Wysocki Reviewed-by: Alex Elder Acked-by: Sumit Garg Link: https://lore.kernel.org/r/2024070136-wrongdoer-busily-01e8@gregkh Signed-off-by: Greg Kroah-Hartman

s390/virtio_ccw: use DMA handle from DMA API

2024-03-13T08:23:46+00:00

Change and use ccw_device_dma_zalloc() so it returns a virtual address like before, which can be used to access data. However also pass a new dma32_t pointer type handle, which correlates to the returned virtual address. This pointer is used to directly pass/set the DMA handle as returned by the DMA API. Signed-off-by: Halil Pasic Reviewed-by: Eric Farman Signed-off-by: Heiko Carstens

s390/cio: introduce locking for register/unregister functions

2023-01-31T17:56:36+00:00

Unbinding an I/O subchannel with a child-CCW device in disconnected state sometimes causes a kernel-panic. The race condition was seen mostly during testing, when setting all the CHPIDs of a device to offline and at the same time, the unbinding the I/O subchannel driver. The kernel-panic occurs because of double delete, the I/O subchannel driver calls device_del on the CCW device while another device_del invocation for the same device is in-flight. For instance, disabling all the CHPIDs will trigger the ccw_device_remove function, which will call a ccw_device_unregister(), which ends up calling the device_del() which is asynchronous via cdev's todo workqueue. And unbinding the I/O subchannel driver calls io_subchannel_remove() function which calls the ccw_device_unregister() and device_del(). This double delete can be prevented by serializing all CCW device registration/unregistration calls into the driver core. This patch introduces a mutex which will be used for this purpose. Signed-off-by: Vineeth Vijayan Reported-by: Boris Fiuczynski Reviewed-by: Peter Oberparleiter Signed-off-by: Heiko Carstens

s390/cio: remove unused ccw_device_force_console() declaration

2022-09-28T09:12:44+00:00

ccw_device_force_console() has been removed by commit 8cc0dcfdc1c0 ("s390/cio: remove pm support from ccw bus driver"), so remove the declaration, too. Signed-off-by: Gaosheng Cui Acked-by: Vineeth Vijayan Signed-off-by: Vasily Gorbik

s390/cio: remove duplicate struct ccw1 declaration

2021-04-05T09:30:57+00:00

struct ccw1 is declared twice. One has been declared at 21st line. Remove the duplicate. Signed-off-by: Wan Jiabing Acked-by: Vineeth Vijayan Signed-off-by: Heiko Carstens

Merge tag 'for-5.11/drivers-2020-12-14' of git://git.kernel.dk/linux-block

2020-12-16T21:09:32+00:00

Pull block driver updates from Jens Axboe: "Nothing major in here: - NVMe pull request from Christoph: - nvmet passthrough improvements (Chaitanya Kulkarni) - fcloop error injection support (James Smart) - read-only support for zoned namespaces without Zone Append (Javier González) - improve some error message (Minwoo Im) - reject I/O to offline fabrics namespaces (Victor Gladkov) - PCI queue allocation cleanups (Niklas Schnelle) - remove an unused allocation in nvmet (Amit Engel) - a Kconfig spelling fix (Colin Ian King) - nvme_req_qid simplication (Baolin Wang) - MD pull request from Song: - Fix race condition in md_ioctl() (Dae R. Jeong) - Initialize read_slot properly for raid10 (Kevin Vigor) - Code cleanup (Pankaj Gupta) - md-cluster resync/reshape fix (Zhao Heming) - Move null_blk into its own directory (Damien Le Moal) - null_blk zone and discard improvements (Damien Le Moal) - bcache race fix (Dongsheng Yang) - Set of rnbd fixes/improvements (Gioh Kim, Guoqing Jiang, Jack Wang, Lutz Pogrell, Md Haris Iqbal) - lightnvm NULL pointer deref fix (tangzhenhao) - sr in_interrupt() removal (Sebastian Andrzej Siewior) - FC endpoint security support for s390/dasd (Jan Höppner, Sebastian Ott, Vineeth Vijayan). From the s390 arch guys, arch bits included as it made it easier for them to funnel the feature through the block driver tree. - Follow up fixes (Colin Ian King)" * tag 'for-5.11/drivers-2020-12-14' of git://git.kernel.dk/linux-block: (64 commits) block: drop dead assignments in loop_init() sr: Remove in_interrupt() usage in sr_init_command(). sr: Switch the sector size back to 2048 if sr_read_sector() changed it. cdrom: Reset sector_size back it is not 2048. drivers/lightnvm: fix a null-ptr-deref bug in pblk-core.c null_blk: Move driver into its own directory null_blk: Allow controlling max_hw_sectors limit null_blk: discard zones on reset null_blk: cleanup discard handling null_blk: Improve implicit zone close null_blk: improve zone locking block: Align max_hw_sectors to logical blocksize null_blk: Fail zone append to conventional zones null_blk: Fix zone size initialization bcache: fix race between setting bdev state to none and new write request direct to backing block/rnbd: fix a null pointer dereference on dev->blk_symlink_name block/rnbd-clt: Dynamically alloc buffer for pathname & blk_symlink_name block/rnbd: call kobject_put in the failure path Documentation/ABI/rnbd-srv: add document for force_close block/rnbd-srv: close a mapped device from server side. ...

s390/cio: remove pm support from ccw bus driver

2020-12-02T17:19:25+00:00

As part of removing broken pm-support from s390 arch, remove the pm callbacks from ccw-bus driver.The power-management functions are unused since the 'commit 394216275c7d ("s390: remove broken hibernate / power management support")'. Signed-off-by: Vineeth Vijayan Reviewed-by: Peter Oberparleiter Signed-off-by: Heiko Carstens

s390/cio: fix kernel-doc markups in cio driver.

2020-11-20T18:19:10+00:00

Fix typo in the kernel-doc markups 1. ccw driver -> ccw_driver 2. ccw_device_id_is_equal() -> ccw_dev_id_is_equal Signed-off-by: Mauro Carvalho Chehab Reviewed-by: Cornelia Huck [vneethv@linux.ibm.com: slight modification in the changelog] Reviewed-by: Vineeth Vijayan Signed-off-by: Heiko Carstens

s390/cio: Add support for FCES status notification

2020-11-16T15:14:38+00:00

Fibre Channel Endpoint-Security event is received as an sei:nt0 type in the CIO layer. This information needs to be shared with the CCW device drivers using the path_events callback. Co-developed-by: Sebastian Ott Signed-off-by: Vineeth Vijayan Signed-off-by: Sebastian Ott Signed-off-by: Stefan Haberland Reviewed-by: Peter Oberparleiter Acked-by: Vasily Gorbik Signed-off-by: Jens Axboe

s390/cio: Helper functions to read CSSID, IID, and CHID

2020-09-15T20:21:46+00:00

Add helper functions to expose Channel Subsystem ID (CSSID), MIF Image Id (IID), Channel ID (CHID) and Channel Path ID (CHPID). These values are required by the qeth driver's exploitation of network- address-change-notifications to determine which entries belong to this interface. Store the Partition identifier in System log, as this may be used to map a Linux view to a Hardware view for debugging purpose. Signed-off-by: Alexandra Winter Reviewed-by: Vineeth Vijayan Signed-off-by: Julian Wiedmann Acked-by: Heiko Carstens Signed-off-by: David S. Miller