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Herve Codina 42604f8eb7 of: address: Fix address translation when address-size is greater than 2 
With the recent addition of of_pci_prop_ranges() in commit 407d1a5192
("PCI: Create device tree node for bridge"), the ranges property can
have a 3 cells child address, a 3 cells parent address and a 2 cells
child size.

A range item property for a PCI device is filled as follow:
  <BAR_nbr> 0 0 <phys.hi> <phys.mid> <phys.low> <BAR_sizeh> <BAR_sizel>
  <-- Child --> <-- Parent (PCI definition) --> <- BAR size (64bit) -->

This allow to translate BAR addresses from the DT. For instance:
pci@0,0 {
  #address-cells = <0x03>;
  #size-cells = <0x02>;
  device_type = "pci";
  compatible = "pci11ab,100", "pciclass,060400", "pciclass,0604";
  ranges = <0x82000000 0x00 0xe8000000
            0x82000000 0x00 0xe8000000
	    0x00 0x4400000>;
  ...
  dev@0,0 {
    #address-cells = <0x03>;
    #size-cells = <0x02>;
    compatible = "pci1055,9660", "pciclass,020000", "pciclass,0200";
    /* Translations for BAR0 to BAR5 */
    ranges = <0x00 0x00 0x00 0x82010000 0x00 0xe8000000 0x00 0x2000000
              0x01 0x00 0x00 0x82010000 0x00 0xea000000 0x00 0x1000000
              0x02 0x00 0x00 0x82010000 0x00 0xeb000000 0x00 0x800000
              0x03 0x00 0x00 0x82010000 0x00 0xeb800000 0x00 0x800000
              0x04 0x00 0x00 0x82010000 0x00 0xec000000 0x00 0x20000
              0x05 0x00 0x00 0x82010000 0x00 0xec020000 0x00 0x2000>;
    ...
    pci-ep-bus@0 {
      #address-cells = <0x01>;
      #size-cells = <0x01>;
      compatible = "simple-bus";
      /* Translate 0xe2000000 to BAR0 and 0xe0000000 to BAR1 */
      ranges = <0xe2000000 0x00 0x00 0x00 0x2000000
                0xe0000000 0x01 0x00 0x00 0x1000000>;
      ...
    };
  };
};

During the translation process, the "default-flags" map() function is
used to select the matching item in the ranges table and determine the
address offset from this matching item.
This map() function simply calls of_read_number() and when address-size
is greater than 2, the map() function skips the extra high address part
(ie part over 64bit). This lead to a wrong matching item and a wrong
offset computation.
Also during the translation itself, the extra high part related to the
parent address is not present in the translated address.

Fix the "default-flags" map() and translate() in order to take into
account the child extra high address part in map() and the parent extra
high address part in translate() and so having a correct address
translation for ranges patterns such as the one given in the example
above.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Link: https://lore.kernel.org/r/20231017110221.189299-2-herve.codina@bootlin.com
Signed-off-by: Rob Herring <robh@kernel.org>
History 2023-10-26 09:05:50 -05:00
arch Fix preemption delays in the SGX code, remove unnecessarily UAPI-exported code, 2023-09-10 10:39:31 -07:00
block block: fix pin count management when merging same-page segments 2023-09-06 07:32:27 -06:00
certs certs: Reference revocation list for all keyrings 2023-08-17 20:12:41 +00:00
crypto This update includes the following changes: 2023-08-29 11:23:29 -07:00
Documentation dt-bindings: watchdog: cnxt,cx92755-wdt: convert txt to yaml 2023-10-25 15:03:32 -05:00
drivers of: address: Fix address translation when address-size is greater than 2 2023-10-26 09:05:50 -05:00
fs six smb3 client fixes, one fix for nls Kconfig, one minor spnego registry update 2023-09-09 19:56:23 -07:00
include six smb3 client fixes, one fix for nls Kconfig, one minor spnego registry update 2023-09-09 19:56:23 -07:00
init workqueue: Changes for v6.6 2023-09-01 16:06:32 -07:00
io_uring Revert "io_uring: fix IO hang in io_wq_put_and_exit from do_exit()" 2023-09-07 09:41:49 -06:00
ipc Add x86 shadow stack support 2023-08-31 12:20:12 -07:00
kernel RISC-V Patches for the 6.6 Merge Window, Part 2 (try 2) 2023-09-09 14:25:11 -07:00
lib iov_iter: Kunit tests for page extraction 2023-09-09 15:11:49 -07:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm LoongArch changes for v6.6 2023-09-08 12:16:52 -07:00
net Including fixes from netfilter and bpf. 2023-09-07 18:33:07 -07:00
rust Documentation work keeps chugging along; stuff for 6.6 includes: 2023-08-30 20:05:42 -07:00
samples VFIO updates for v6.6-rc1 2023-08-30 20:36:01 -07:00
scripts dt: dt-extract-compatibles: Add flag for driver matching compatibles 2023-09-20 14:25:10 -05:00
security Landlock updates for v6.6-rc1 2023-09-08 12:06:51 -07:00
sound sound fixes for 6.6-rc1 2023-09-08 13:07:50 -07:00
tools kselftest: Add new test for detecting unprobed Devicetree devices 2023-09-20 14:25:10 -05:00
usr initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP 2023-06-06 17:54:49 +09:00
virt ARM: 2023-09-07 13:52:20 -07:00
.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 for-linus-2023083101 2023-09-01 12:31:44 -07:00
.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 kselftest: Add new test for detecting unprobed Devicetree devices 2023-09-20 14:25:10 -05:00
Makefile Linux 6.6-rc1 2023-09-10 16:28:41 -07:00
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.