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Manivannan Sadhasivam 7aeca6f44c PCI: qcom: Enable BDF to SID translation properly 
[ Upstream commit bf79e33cdd ]

Qcom SoCs making use of ARM SMMU require BDF to SID translation table in
the driver to properly map the SID for the PCIe devices based on their BDF
identifier. This is currently achieved with the help of
qcom_pcie_config_sid_1_9_0() function for SoCs supporting the 1_9_0 config.

But With newer Qcom SoCs starting from SM8450, BDF to SID translation is
set to bypass mode by default in hardware. Due to this, the translation
table that is set in the qcom_pcie_config_sid_1_9_0() is essentially
unused and the default SID is used for all endpoints in SoCs starting from
SM8450.

This is a security concern and also warrants swapping the DeviceID in DT
while using the GIC ITS to handle MSIs from endpoints. The swapping is
currently done like below in DT when using GIC ITS:

      /*
	* MSIs for BDF (1:0.0) only works with Device ID 0x5980.
	* Hence, the IDs are swapped.
	*/
      msi-map = <0x0 &gic_its 0x5981 0x1>,
		<0x100 &gic_its 0x5980 0x1>;

Here, swapping of the DeviceIDs ensure that the endpoint with BDF (1:0.0)
gets the DeviceID 0x5980 which is associated with the default SID as per
the iommu mapping in DT. So MSIs were delivered with IDs swapped so far.
But this also means the Root Port (0:0.0) won't receive any MSIs (for PME,
AER etc...)

So let's fix these issues by clearing the BDF to SID bypass mode for all
SoCs making use of the 1_9_0 config. This allows the PCIe devices to use
the correct SID, thus avoiding the DeviceID swapping hack in DT and also
achieving the isolation between devices.

Fixes: 4c93988221 ("PCI: qcom: Add support for configuring BDF to SID mapping for SM8250")
Link: https://lore.kernel.org/linux-pci/20240307-pci-bdf-sid-fix-v1-1-9423a7e2d63c@linaro.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Cc: stable@vger.kernel.org # 5.11
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2024-04-03 15:28:29 +02:00
arch sparc32: Fix parport build with sparc32 2024-04-03 15:28:29 +02:00
block block: Fix page refcounts for unaligned buffers in __bio_release_pages() 2024-04-03 15:28:27 +02:00
certs certs: Reference revocation list for all keyrings 2023-08-17 20:12:41 +00:00
crypto crypto: jitter - fix CRYPTO_JITTERENTROPY help text 2024-03-26 18:19:52 -04:00
Documentation docs: Restore "smart quotes" for quotes 2024-04-03 15:28:22 +02:00
drivers PCI: qcom: Enable BDF to SID translation properly 2024-04-03 15:28:29 +02:00
fs NFS: Read unlock folio on nfs_page_create_from_folio() error 2024-04-03 15:28:29 +02:00
include nfs: fix UAF in direct writes 2024-04-03 15:28:29 +02:00
init modules: wait do_free_init correctly 2024-03-26 18:19:55 -04:00
io_uring io_uring: fix mshot io-wq checks 2024-04-03 15:28:29 +02:00
ipc Add x86 shadow stack support 2023-08-31 12:20:12 -07:00
kernel serial: Lock console when calling into driver before registration 2024-04-03 15:28:26 +02:00
lib pci_iounmap(): Fix MMIO mapping leak 2024-04-03 15:28:17 +02:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm: swap: fix race between free_swap_and_cache() and swapoff() 2024-04-03 15:28:27 +02:00
net mac802154: fix llsec key resources release in mac802154_llsec_key_del 2024-04-03 15:28:27 +02:00
rust rust: upgrade to Rust 1.73.0 2024-02-16 19:10:43 +01:00
samples work around gcc bugs with 'asm goto' with outputs 2024-02-23 09:24:47 +01:00
scripts kbuild: Move -Wenum-{compare-conditional,enum-conversion} into W=1 2024-04-03 15:28:29 +02:00
security landlock: Warn once if a Landlock action is requested while disabled 2024-04-03 15:28:27 +02:00
sound ASoC: rockchip: i2s-tdm: Fix inaccurate sampling rates 2024-03-26 18:20:07 -04:00
tools selftests/mqueue: Set timeout to 180 seconds 2024-04-03 15:28:20 +02:00
usr initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP 2023-06-06 17:54:49 +09:00
virt KVM: Always flush async #PF workqueue when vCPU is being destroyed 2024-04-03 15:28:18 +02:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: rpm-pkg: rename binkernel.spec to kernel.spec 2023-07-25 00:59:33 +09:00
.mailmap 20 hotfixes. 12 are cc:stable and the remainder address post-6.5 issues 2023-10-24 09:52:16 -10:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS USB: Remove Wireless USB and UWB documentation 2023-08-09 14:17:32 +02:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS MAINTAINERS: add Catherine as xfs maintainer for 6.6.y 2024-02-16 19:10:43 +01:00
Makefile Linux 6.6.23 2024-03-26 18:22:53 -04:00
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.