kernel/drivers/misc/sgi-xp/xpc.h, branch linux-rolling-stable

misc/sgi-xp: Replace in_interrupt() usage

2020-12-09T18:35:52Z

The usage of in_interrupt() in xpc_partition_disengaged() is clearly intended to avoid canceling the timeout timer when the function is invoked from the timer callback. While in_interrupt() is deprecated and ill defined as it does not provide what the name suggests it catches the intended case. Add an argument to xpc_partition_disengaged() which is true if called from timer and otherwise false. Use del_timer_sync() instead of del_singleshot_timer_sync() which is the same thing. Note: This does not prevent reentrancy into the function as the function has no concurrency control and timer callback and regular task context callers can happen concurrently on different CPUs or the timer can interrupt the task context before it is able to cancel it. While the only driver which is providing the arch_xpc_ops callbacks (xpc_uv) seems not to have a reentrancy problem and the only negative effect would be a double dev_info() entry in dmesg, the whole mechanism is conceptually broken. But that's not subject of this cleanup endeavour and left as an exercise to the folks who might have interest to make that code fully correct. [bigeasy: Add the argument, use del_timer_sync().] Cc: Greg Kroah-Hartman Cc: Cliff Whickman Cc: Arnd Bergmann Cc: Robin Holt Cc: Steve Wahl Cc: Dimitri Sivanich Cc: Russ Anderson Reviewed-by: Steve Wahl Signed-off-by: Thomas Gleixner Signed-off-by: Sebastian Andrzej Siewior Link: https://lore.kernel.org/r/20201119103151.ppo45mj53ulbxjx4@linutronix.de Signed-off-by: Greg Kroah-Hartman

misc/sgi-xp: remove SGI SN2 support

2019-08-16T18:33:56Z

Note this also marks xp broken on ia64 now, as the UV support, which was disable in generic kernels before actually never compiled due to undefined uv_gpa_to_soc_phys_ram and uv_gpa_in_mmr_space symbols since at least commit c2c9f1157414 ("x86: uv: update XPC to handle updated BIOS interface"). Signed-off-by: Christoph Hellwig Link: https://lkml.kernel.org/r/20190813072514.23299-11-hch@lst.de Signed-off-by: Tony Luck

sgi-xpc: clean up numerous globals

2009-04-13T22:04:33Z

Introduce xpc_arch_ops and eliminate numerous individual global definitions. Signed-off-by: Robin Holt Cc: Dean Nelson Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

sgi-xpc: implement opencomplete messaging

2009-04-13T22:04:33Z

sgi-xpc has a window of failure where an open message can be sent and a subsequent data message can get lost. We have added a new message (opencomplete) which closes that window. Signed-off-by: Robin Holt Signed-off-by: Dean Nelson Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

sgi-xpc: prevent false heartbeat failures

2009-04-13T22:04:33Z

The heartbeat timeout functionality in sgi-xpc is currently not trained to the connection time. If a connection is made and the code is in the last polling window prior to doing a timeout, the next polling window will see the heartbeat as unchanged and initiate a no-heartbeat disconnect. Signed-off-by: Robin Holt Signed-off-by: Dean Nelson Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

sgi-gru: add support to the GRU driver for message queue interrupts

2009-04-03T02:05:06Z

Add support to the GRU driver for message queue interrupts. Signed-off-by: Jack Steiner Signed-off-by: Dean Nelson Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

sgi-xp: fix writing past the end of kzalloc()'d space

2009-02-05T20:56:49Z

A missing type cast results in writing way beyond the end of a kzalloc()'d memory segment resulting in slab corruption. But it seems like the better solution is to define ->recv_msg_slots as a 'void *' rather than a 'struct xpc_notify_mq_msg_uv *' and add the type cast. Signed-off-by: Dean Nelson Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

sgi-xp: create activate and notify gru message queues

2008-11-06T04:32:20Z

For UV add the code to create the activate and notify gru message queues. Signed-off-by: Dean Nelson Signed-off-by: H. Peter Anvin

sgi-xp: setup the notify GRU message queue

2008-07-30T16:41:50Z

Setup the notify GRU message queue that is used for sending user messages on UV systems. Signed-off-by: Dean Nelson Cc: Jack Steiner Cc: "Luck, Tony" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

sgi-xp: setup the activate GRU message queue

2008-07-30T16:41:50Z

Setup the activate GRU message queue that is used for partition activation and channel connection on UV systems. Signed-off-by: Dean Nelson Cc: Jack Steiner Cc: "Luck, Tony" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds