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Tomas Krcka a2bc5241ee iommu/arm-smmu-v3: Acknowledge pri/event queue overflow if any 
[ Upstream commit 67ea0b7ce4 ]

When an overflow occurs in the PRI queue, the SMMU toggles the overflow
flag in the PROD register. To exit the overflow condition, the PRI thread
is supposed to acknowledge it by toggling this flag in the CONS register.
Unacknowledged overflow causes the queue to stop adding anything new.

Currently, the priq thread always writes the CONS register back to the
SMMU after clearing the queue.

The writeback is not necessary if the OVFLG in the PROD register has not
been changed, no overflow has occured.

This commit checks the difference of the overflow flag between CONS and
PROD register. If it's different, toggles the OVACKFLG flag in the CONS
register and write it to the SMMU.

The situation is similar for the event queue.
The acknowledge register is also toggled after clearing the event
queue but never propagated to the hardware. This would only be done the
next time when executing evtq thread.

Unacknowledged event queue overflow doesn't affect the event
queue, because the SMMU still adds elements to that queue when the
overflow condition is active.
But it feel nicer to keep SMMU in sync when possible, so use the same
way here as well.

Signed-off-by: Tomas Krcka <krckatom@amazon.de>
Link: https://lore.kernel.org/r/20230329123420.34641-1-tomas.krcka@gmail.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2023-05-24 17:36:48 +01:00
arch arm64: dts: qcom: msm8996: Add missing DWC3 quirks 2023-05-24 17:36:43 +01:00
block blk-crypto: make blk_crypto_evict_key() more robust 2023-05-11 23:00:16 +09:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-22 14:22:01 +02:00
crypto crypto: engine - fix crypto_queue backlog handling 2023-05-17 11:50:20 +02:00
Documentation riscv: Move early dtb mapping into the fixmap region 2023-05-01 08:23:24 +09:00
drivers iommu/arm-smmu-v3: Acknowledge pri/event queue overflow if any 2023-05-24 17:36:48 +01:00
fs fs/ntfs3: Fix a possible null-pointer dereference in ni_clear() 2023-05-24 17:36:47 +01:00
include sched: Fix KCSAN noinstr violation 2023-05-24 17:36:47 +01:00
init kbuild: Add CONFIG_PAHOLE_VERSION 2023-02-25 12:06:45 +01:00
io_uring io_uring: avoid null-ptr-deref in io_arm_poll_handler 2023-03-22 13:31:37 +01:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2022-12-08 11:28:45 +01:00
kernel bpf: Add preempt_count_{sub,add} into btf id deny list 2023-05-24 17:36:45 +01:00
lib lib: cpu_rmap: Avoid use after free on rmap->obj array entries 2023-05-24 17:36:45 +01:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm writeback, cgroup: fix null-ptr-deref write in bdi_split_work_to_wbs 2023-05-11 23:00:18 +09:00
net Bluetooth: L2CAP: fix "bad unlock balance" in l2cap_disconnect_rsp 2023-05-24 17:36:46 +01:00
samples samples/bpf: Fix fout leak in hbm's run_bpf_prog 2023-05-24 17:36:45 +01:00
scripts recordmcount: Fix memory leaks in the uwrite function 2023-05-24 17:36:47 +01:00
security selinux: ensure av_permissions.h is built when needed 2023-05-11 23:00:19 +09:00
sound ASoC: soc-pcm.c: call __soc_pcm_close() in soc_pcm_close() 2023-05-17 11:50:27 +02:00
tools perf stat: Separate bperf from bpf_profiler 2023-05-17 11:50:21 +02:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2022-02-01 17:27:15 +01:00
virt KVM: fix memoryleak in kvm_init() 2023-03-17 08:49:04 +01:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: add Andrej Shadura 2021-10-18 20:22:03 -10:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS counter: Internalize sysfs interface code 2023-04-20 12:13:55 +02:00
Makefile Linux 5.15.112 2023-05-17 11:50:31 +02:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.