drm/xe/pxp: Don't kill queues while holding PXP locks

xe_exec_queue_kill can sleep, so we can't call it from under a spinlock.
We can instead move the queues to a separate list and then kill them all
after we release the spinlock.

Furthermore, xe_exec_queue_kill can take the VM lock so we can't call it
while holding the PXP mutex because the mutex is taken under VM lock at
queue creation time. Note that while it is safe to call the kill without
holding the mutex, we must call it after the PXP state has been updated,
otherwise an app might be able to create a queue between the
invalidation and the state update, which would break the state machine.

Since being in the list is used to track whether RPM cleanup is needed,
we can no longer defer that to queue_destroy, so we perform it
immediately instead.

v2: also avoid calling kill() under pxp->mutex.

Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/intel-xe/34aaced9-4a9d-4e8c-900a-b8f73452e35c@stanley.mountain/
Fixes: f8caa80154c4 ("drm/xe/pxp: Add PXP queue tracking and session start")
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: John Harrison <John.C.Harrison@Intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250225235328.2895877-1-daniele.ceraolospurio@intel.com

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