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Ilpo Järvinen f2d7da8faf PCI: Add locking to RMW PCI Express Capability Register accessors [ Upstream commit `5e70d0acf0` ] Many places in the kernel write the Link Control and Root Control PCI Express Capability Registers without proper concurrency control and this could result in losing the changes one of the writers intended to make. Add pcie_cap_lock spinlock into the struct pci_dev and use it to protect bit changes made in the RMW capability accessors. Protect only a selected set of registers by differentiating the RMW accessor internally to locked/unlocked variants using a wrapper which has the same signature as pcie_capability_clear_and_set_word(). As the Capability Register (pos) given to the wrapper is always a constant, the compiler should be able to simplify all the dead-code away. So far only the Link Control Register (ASPM, hotplug, link retraining, various drivers) and the Root Control Register (AER & PME) seem to require RMW locking. Suggested-by: Lukas Wunner <lukas@wunner.de> Fixes: `c7f486567c` ("PCI PM: PCIe PME root port service driver") Fixes: `f12eb72a26` ("PCI/ASPM: Use PCI Express Capability accessors") Fixes: `7d715a6c1a` ("PCI: add PCI Express ASPM support") Fixes: `affa48de84` ("staging/rdma/hfi1: Add support for enabling/disabling PCIe ASPM") Fixes: `849a9366cb` ("misc: rtsx: Add support new chip rts5228 mmc: rtsx: Add support MMC_CAP2_NO_MMC") Fixes: `3d1e7aa80d` ("misc: rtsx: Use pcie_capability_clear_and_set_word() for PCI_EXP_LNKCTL") Fixes: `c0e5f4e73a` ("misc: rtsx: Add support for RTS5261") Fixes: `3df4fce739` ("misc: rtsx: separate aspm mode into MODE_REG and MODE_CFG") Fixes: `121e9c6b5c` ("misc: rtsx: modify and fix init_hw function") Fixes: `19f3bd548f` ("mfd: rtsx: Remove LCTLR defination") Fixes: `773ccdfd9c` ("mfd: rtsx: Read vendor setting from config space") Fixes: `8275b77a15` ("mfd: rts5249: Add support for RTS5250S power saving") Fixes: `5da4e04ae4` ("misc: rtsx: Add support for RTS5260") Fixes: `0f49bfbd0f` ("tg3: Use PCI Express Capability accessors") Fixes: `5e7dfd0fb9` ("tg3: Prevent corruption at 10 / 100Mbps w CLKREQ") Fixes: `b726e493e8` ("r8169: sync existing 8168 device hardware start sequences with vendor driver") Fixes: `e6de30d63e` ("r8169: more 8168dp support.") Fixes: `8a06127602` ("Bluetooth: hci_bcm4377: Add new driver for BCM4377 PCIe boards") Fixes: `6f461f6c7c` ("e1000e: enable/disable ASPM L0s and L1 and ERT according to hardware errata") Fixes: `1eae4eb2a1` ("e1000e: Disable L1 ASPM power savings for 82573 mobile variants") Fixes: `8060e169e0` ("ath9k: Enable extended synch for AR9485 to fix L0s recovery issue") Fixes: `69ce674bfa` ("ath9k: do btcoex ASPM disabling at initialization time") Fixes: `f37f055035` ("mt76: mt76x2e: disable pcie_aspm by default") Link: https://lore.kernel.org/r/20230717120503.15276-2-ilpo.jarvinen@linux.intel.com Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: "Rafael J. Wysocki" <rafael@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-09-13 09:42:46 +02:00
arch	arm64: dts: qcom: sc8280xp-x13s: Unreserve NC pins	2023-09-13 09:42:43 +02:00
block	block/mq-deadline: use correct way to throttling write requests	2023-09-13 09:42:42 +02:00
certs	certs: Fix build error when PKCS#11 URI contains semicolon	2023-02-09 11:28:11 +01:00
crypto	crypto: api - Use work queue in crypto_destroy_instance	2023-09-13 09:42:32 +02:00
Documentation	media: uapi: HEVC: Add num_delta_pocs_of_ref_rps_idx field	2023-09-13 09:42:20 +02:00
drivers	PCI: Add locking to RMW PCI Express Capability Register accessors	2023-09-13 09:42:46 +02:00
fs	ext4: avoid potential data overflow in next_linear_group	2023-09-13 09:42:46 +02:00
include	PCI: Add locking to RMW PCI Express Capability Register accessors	2023-09-13 09:42:46 +02:00
init	sched/psi: Select KERNFS as needed	2023-09-13 09:42:28 +02:00
io_uring	io_uring: fix drain stalls by invalid SQE	2023-09-13 09:42:43 +02:00
ipc	ipc: fix memory leak in init_mqueue_fs()	2022-12-31 13:32:01 +01:00
kernel	PCI: Allow drivers to request exclusive config regions	2023-09-13 09:42:46 +02:00
lib	maple_tree: disable mas_wr_append() when other readers are possible	2023-08-30 16:11:13 +02:00
LICENSES	LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers	2021-12-16 14:33:10 +01:00
mm	net-memcg: Fix scope of sockmem pressure indicators	2023-09-13 09:42:33 +02:00
net	netrom: Deny concurrent connect().	2023-09-13 09:42:35 +02:00
rust	rust: allocator: Prevent mis-aligned allocation	2023-08-11 12:08:18 +02:00
samples	samples/bpf: fix broken map lookup probe	2023-09-13 09:42:34 +02:00
scripts	kbuild: rust_is_available: fix confusion when a version appears in the path	2023-09-13 09:42:32 +02:00
security	smackfs: Prevent underflow in smk_set_cipso()	2023-09-13 09:42:42 +02:00
sound	ALSA: ac97: Fix possible error value of *rac97	2023-09-13 09:42:44 +02:00
tools	selftests/bpf: Clean up fmod_ret in bench_rename test script	2023-09-13 09:42:33 +02:00
usr	usr/gen_init_cpio.c: remove unnecessary -1 values from int file	2022-10-03 14:21:44 -07:00
virt	kvm/vfio: ensure kvg instance stays around in kvm_vfio_group_add()	2023-09-13 09:42:46 +02:00
.clang-format	inet: ping: use hlist_nulls rcu iterator during lookup	2022-12-01 12:42:46 +01:00
.cocciconfig
.get_maintainer.ignore	get_maintainer: add Alan to .get_maintainer.ignore	2022-08-20 15:17:44 -07:00
.gitattributes
.gitignore	Kbuild: add Rust support	2022-09-28 09:02:20 +02:00
.mailmap	9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address	2022-12-10 17:10:52 -08:00
.rustfmt.toml	rust: add `.rustfmt.toml`	2022-09-28 09:02:20 +02:00
COPYING
CREDITS	MAINTAINERS: Remove Michal Marek from Kbuild maintainers	2022-11-16 14:53:00 +09:00
Kbuild	Kbuild updates for v6.1	2022-10-10 12:00:45 -07:00
Kconfig
MAINTAINERS	devlink: move code to a dedicated directory	2023-08-30 16:11:00 +02:00
Makefile	kbuild: rust_is_available: remove -v option	2023-09-13 09:42:32 +02:00
README

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.