Marc Zyngier 0be8153cbc genirq/msi: Allow level-triggered MSIs to be exposed by MSI providers ... So far, MSIs have been used to signal edge-triggered interrupts, as a write is a good model for an edge (you can't "unwrite" something). On the other hand, routing zillions of wires in an SoC because you need level interrupts is a bit extreme. People have come up with a variety of schemes to support this, which involves sending two messages: one to signal the interrupt, and one to clear it. Since the kernel cannot represent this, we've ended up with side-band mechanisms that are pretty awful. Instead, let's acknoledge the requirement, and ensure that, under the right circumstances, the irq_compose_msg and irq_write_msg can take as a parameter an array of two messages instead of a pointer to a single one. We also add some checking that the compose method only clobbers the second message if the MSI domain has been created with the MSI_FLAG_LEVEL_CAPABLE flags. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Rob Herring <robh@kernel.org> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com> Cc: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lkml.kernel.org/r/20180508121438.11301-2-marc.zyngier@arm.com		2018-05-13 15:58:59 +02:00
..
bpf	kernel/bpf/syscall: fix warning defined but not used	2018-04-04 11:08:36 +02:00
cgroup	Merge branch 'for-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq	2018-04-03 18:00:13 -07:00
configs	KVM changes for 4.16	2018-02-10 13:16:35 -08:00
debug	* Fix 2032 time access issues and new compiler warnings	2018-04-12 10:21:19 -07:00
events	perf: Remove superfluous allocation error check	2018-04-17 09:47:40 -03:00
gcov
irq	genirq/msi: Allow level-triggered MSIs to be exposed by MSI providers	2018-05-13 15:58:59 +02:00
livepatch	livepatch: Allow to call a custom callback when freeing shadow variables	2018-04-17 13:42:48 +02:00
locking	locking/rwsem: Add DEBUG_RWSEMS to look for lock/unlock mismatches	2018-03-31 07:30:50 +02:00
power	PM / QoS: mark expected switch fall-throughs	2018-04-09 13:49:40 +02:00
printk	New features:	2018-04-10 11:27:30 -07:00
rcu	Merge branches 'fixes.2018.02.23a', 'srcu.2018.02.20a' and 'torture.2018.02.20a' into HEAD	2018-02-23 15:15:41 -08:00
sched	Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-04-15 12:43:30 -07:00
time	posix-cpu-timers: Ensure set_process_cpu_timer is always evaluated	2018-04-19 12:54:57 +02:00
trace	trace_kprobe: Remove warning message "Could not insert probe at..."	2018-04-17 07:54:57 +02:00
.gitignore
acct.c
async.c	kernel/async.c: revert "async: simplify lowest_in_progress()"	2018-02-06 18:32:44 -08:00
audit_fsnotify.c
audit_tree.c	audit: track the owner of the command mutex ourselves	2018-02-23 11:22:22 -05:00
audit_watch.c
audit.c	audit/stable-4.17 PR 20180403	2018-04-06 15:01:25 -07:00
audit.h	audit: track the owner of the command mutex ourselves	2018-02-23 11:22:22 -05:00
auditfilter.c	audit: deprecate the AUDIT_FILTER_ENTRY filter	2018-02-15 14:36:29 -05:00
auditsc.c	audit: bail before bug check if audit disabled	2018-02-15 14:40:25 -05:00
backtracetest.c
bounds.c
capability.c
compat.c	mm: add kernel_move_pages() helper, move compat syscall to mm/migrate.c	2018-04-02 20:15:32 +02:00
configs.c
context_tracking.c
cpu_pm.c
cpu.c	cpu/hotplug: Fix unused function warning	2018-03-15 20:34:40 +01:00
crash_core.c	kexec: export PG_swapbacked to VMCOREINFO	2018-04-13 17:10:27 -07:00
crash_dump.c
cred.c
delayacct.c
dma.c
elfcore.c
exec_domain.c	get rid of pointless includes of fs_struct.h	2018-02-22 14:28:50 -05:00
exit.c	kernel: use kernel_wait4() instead of sys_wait4()	2018-04-02 20:14:51 +02:00
extable.c	extable: Make init_kernel_text() global	2018-02-21 16:54:06 +01:00
fail_function.c	error-injection: Fix to prohibit jump optimization	2018-03-12 16:16:00 +01:00
fork.c	fork: unconditionally clear stack on fork	2018-04-20 17:18:35 -07:00
freezer.c
futex_compat.c
futex.c	pids: introduce find_get_task_by_vpid() helper	2018-02-06 18:32:46 -08:00
groups.c
hung_task.c
irq_work.c
jump_label.c	jump_label: Disable jump labels in __exit code	2018-03-20 08:57:17 +01:00
kallsyms.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk	2018-02-01 13:36:15 -08:00
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c	kcov: detect double association with a single task	2018-02-06 18:32:46 -08:00
kexec_core.c
kexec_file.c	kernel/kexec_file.c: allow archs to set purgatory load address	2018-04-13 17:10:28 -07:00
kexec_internal.h
kexec.c	kexec: call do_kexec_load() in compat syscall directly	2018-04-02 20:15:01 +02:00
kmod.c
kprobes.c	kprobes: Propagate error from disarm_kprobe_ftrace()	2018-02-16 09:12:58 +01:00
ksysfs.c
kthread.c
latencytop.c
Makefile
memremap.c	kernel/memremap: Remove stale devres_free() call	2018-03-06 10:58:54 -08:00
module_signing.c
module-internal.h
module.c	arch: remove obsolete architecture ports	2018-04-02 20:20:12 -07:00
notifier.c
nsproxy.c
padata.c
panic.c	taint: add taint for randstruct	2018-04-11 10:28:35 -07:00
params.c	kernel/params.c: downgrade warning for unsafe parameters	2018-04-11 10:28:37 -07:00
pid_namespace.c	Merge branch 'userns-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2018-04-03 19:15:32 -07:00
pid.c	xarray: add the xa_lock to the radix_tree_root	2018-04-11 10:28:39 -07:00
profile.c
ptrace.c	pids: introduce find_get_task_by_vpid() helper	2018-02-06 18:32:46 -08:00
range.c
reboot.c
relay.c	kernel/relay.c: limit kmalloc size to KMALLOC_MAX_SIZE	2018-02-21 15:35:43 -08:00
resource.c	resource: fix integer overflow at reallocation	2018-04-13 17:10:27 -07:00
seccomp.c	- Fix seccomp GET_METADATA to deal with field sizes correctly (Tycho Andersen)	2018-02-22 10:50:24 -08:00
signal.c	Merge branch 'next-general' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2018-04-07 11:11:41 -07:00
smp.c
smpboot.c
smpboot.h
softirq.c	softirq: Consolidate common code in tasklet_[hi]_action()	2018-03-09 11:50:55 +01:00
stacktrace.c
stop_machine.c
sys_ni.c	syscalls/core: Prepare CONFIG_ARCH_HAS_SYSCALL_WRAPPER=y for compat syscalls	2018-04-05 16:59:38 +02:00
sys.c	kernel: add ksys_setsid() helper; remove in-kernel call to sys_setsid()	2018-04-02 20:16:06 +02:00
sysctl_binary.c
sysctl.c	kernel/sysctl.c: add kdoc comments to do_proc_do{u}intvec_minmax_conv_param	2018-04-11 10:28:38 -07:00
task_work.c
taskstats.c	pids: introduce find_get_task_by_vpid() helper	2018-02-06 18:32:46 -08:00
test_kprobes.c
torture.c
tracepoint.c
tsacct.c
ucount.c	headers: untangle kmemleak.h from mm.h	2018-04-05 21:36:27 -07:00
uid16.c	fs: add do_fchownat(), ksys_fchown() helpers and ksys_{,l}chown() wrappers	2018-04-02 20:15:59 +02:00
uid16.h	kernel: provide ksys_*() wrappers for syscalls called by kernel/uid16.c	2018-04-02 20:15:30 +02:00
umh.c	kernel: use kernel_wait4() instead of sys_wait4()	2018-04-02 20:14:51 +02:00
up.c
user_namespace.c
user-return-notifier.c
user.c	efivarfs: Limit the rate for non-root to read files	2018-02-22 10:21:02 -08:00
utsname_sysctl.c
utsname.c	uts: create "struct uts_namespace" from kmem_cache	2018-04-11 10:28:35 -07:00
watchdog_hld.c
watchdog.c
workqueue_internal.h
workqueue.c	Merge branch 'for-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq	2018-04-03 18:00:13 -07:00