Commit Graph
323 Commits
Author SHA1 Message Date
Jakub Kicinski 4f10f1dfb2 net: remove ISDN subsystem and Bluetooth CMTP
Remove the ISDN (mISDN, CAPI) subsystem and Bluetooth CMTP protocol
from the kernel tree.

ISDN is a pretty old technology and it's unclear whether anyone still
uses it. I went over the last few years of git history and all the
commits are either tree-wide conversions or syzbot/static analyzer
fixes.

When we discussed removal in the past IIRC there were some concerns
about ISDN still being used in parts of Germany. Unfortunately, the
code base is quite old, none of the current maintainers are familiar
with it and AI tools will have a field day finding bugs here.

Delete this code and preserve it in an out-of-tree repository
for any remaining users:
https://github.com/linux-netdev/mod-orphan

UAPI constants AF_ISDN/PF_ISDN and the SELinux isdn_socket class
are preserved for ABI stability, but the rest of uAPI is removed.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20260421022108.1299678-1-kuba@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2026-04-23 10:24:02 -07:00
Vladimir OlteanandVinod Koul 3ddcd24b4d phy: enter drivers/phy/Makefile even without CONFIG_GENERIC_PHY
Kconfig option CONFIG_PHY_COMMON_PROPS, which builds
drivers/phy/phy-common-props.c, was intended to be selectable
independently of CONFIG_GENERIC_PHY. Yet it lives in drivers/phy/, which
is entered by the Makefile only if CONFIG_GENERIC_PHY is set.

Allow the Makefile to enter one level deeper, but stop at drivers/phy/
if CONFIG_GENERIC_PHY is unselected (i.e. do not enter vendor folders).
The other stuff from drivers/phy/Makefile except for CONFIG_PHY_COMMON_PROPS,
like CONFIG_PHY_NXP_PTN3222, all depends on CONFIG_GENERIC_PHY.

Fixes: e7556b59ba ("phy: add phy_get_rx_polarity() and phy_get_tx_polarity()")
Closes: https://lore.kernel.org/lkml/43ea0202-891d-4582-980b-5cb557b41114@linux.ibm.com/
Reported-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Debugged-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Link: https://patch.msgid.link/20260123110600.3118561-1-vladimir.oltean@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
2026-02-04 20:45:26 +05:30
Linus Torvalds 37bb2e7217 Merge tag 'staging-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging
Pull staging driver updates from Greg KH:
 "Here is the big set of staging driver updates for 6.19-rc1.

  Only thing "major" in here is that two subsystems, gpib and vc04 have
  moved out of the staging tree into the "real" portion of the kernel,
  which is great to see. Other than that, the rest of the changes are
  just tiny coding style cleanups, nothing earth-shattering.

  All of these have been in linux-next for a while with no reported
  problems"

* tag 'staging-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (53 commits)
  staging: rtl8723bs: fix out-of-bounds read in OnBeacon ESR IE parsing
  staging: rtl8723bs: fix stack buffer overflow in OnAssocReq IE parsing
  staging: rtl8723bs: fix out-of-bounds read in rtw_get_ie() parser
  staging: gpib: Clean-up commented-out code
  staging: rtl8723bs: remove custom FIELD_OFFSET macro
  staging: rtl8723bs: replace FIELD_OFFSET usage with offsetof in rtw_mlme_ext.c
  staging: rtl8723bs: remove dead commented code from odm.c
  staging: rtl8723bs: use standard offsetof in cfg80211 operations
  staging: rtl8723bs: remove unused registry and BSSID offset macros
  staging: rtl8723bs: core: delete commented-out code
  staging: rtl8723bs: core: fix block comment style issues
  staging: greybus: uart: check return values during probe
  staging: fbtft: core: fix potential memory leak in fbtft_probe_common()
  staging: gpib: Destage gpib
  staging: gpib: Fix SPDX license for gpib headers
  staging: gpib: Update TODO file
  staging: gpib: Change // comments in uapi header file
  platform/raspberrypi: Destage VCHIQ MMAL driver
  platform/raspberrypi: Destage VCHIQ interface
  staging: vc04_services: Cleanup VCHIQ TODO entries
  ...
2025-12-06 18:52:00 -08:00
Linus Torvalds 249872f53d Merge tag 'tsm-for-6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/devsec/tsm
Pull PCIe Link Encryption and Device Authentication from Dan Williams:
 "New PCI infrastructure and one architecture implementation for PCIe
  link encryption establishment via platform firmware services.

  This work is the result of multiple vendors coming to consensus on
  some core infrastructure (thanks Alexey, Yilun, and Aneesh!), and
  three vendor implementations, although only one is included in this
  pull. The PCI core changes have an ack from Bjorn, the crypto/ccp/
  changes have an ack from Tom, and the iommu/amd/ changes have an ack
  from Joerg.

  PCIe link encryption is made possible by the soup of acronyms
  mentioned in the shortlog below. Link Integrity and Data Encryption
  (IDE) is a protocol for installing keys in the transmitter and
  receiver at each end of a link. That protocol is transported over Data
  Object Exchange (DOE) mailboxes using PCI configuration requests.

  The aspect that makes this a "platform firmware service" is that the
  key provisioning and protocol is coordinated through a Trusted
  Execution Envrionment (TEE) Security Manager (TSM). That is either
  firmware running in a coprocessor (AMD SEV-TIO), or quasi-hypervisor
  software (Intel TDX Connect / ARM CCA) running in a protected CPU
  mode.

  Now, the only reason to ask a TSM to run this protocol and install the
  keys rather than have a Linux driver do the same is so that later, a
  confidential VM can ask the TSM directly "can you certify this
  device?".

  That precludes host Linux from provisioning its own keys, because host
  Linux is outside the trust domain for the VM. It also turns out that
  all architectures, save for one, do not publish a mechanism for an OS
  to establish keys in the root port. So "TSM-established link
  encryption" is the only cross-architecture path for this capability
  for the foreseeable future.

  This unblocks the other arch implementations to follow in v6.20/v7.0,
  once they clear some other dependencies, and it unblocks the next
  phase of work to implement the end-to-end flow of confidential device
  assignment. The PCIe specification calls this end-to-end flow Trusted
  Execution Environment (TEE) Device Interface Security Protocol
  (TDISP).

  In the meantime, Linux gets a link encryption facility which has
  practical benefits along the same lines as memory encryption. It
  authenticates devices via certificates and may protect against
  interposer attacks trying to capture clear-text PCIe traffic.

  Summary:

   - Introduce the PCI/TSM core for the coordination of device
     authentication, link encryption and establishment (IDE), and later
     management of the device security operational states (TDISP).
     Notify the new TSM core layer of PCI device arrival and departure

   - Add a low level TSM driver for the link encryption establishment
     capabilities of the AMD SEV-TIO architecture

   - Add a library of helpers TSM drivers to use for IDE establishment
     and the DOE transport

   - Add skeleton support for 'bind' and 'guest_request' operations in
     support of TDISP"

* tag 'tsm-for-6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/devsec/tsm: (23 commits)
  crypto/ccp: Fix CONFIG_PCI=n build
  virt: Fix Kconfig warning when selecting TSM without VIRT_DRIVERS
  crypto/ccp: Implement SEV-TIO PCIe IDE (phase1)
  iommu/amd: Report SEV-TIO support
  psp-sev: Assign numbers to all status codes and add new
  ccp: Make snp_reclaim_pages and __sev_do_cmd_locked public
  PCI/TSM: Add 'dsm' and 'bound' attributes for dependent functions
  PCI/TSM: Add pci_tsm_guest_req() for managing TDIs
  PCI/TSM: Add pci_tsm_bind() helper for instantiating TDIs
  PCI/IDE: Initialize an ID for all IDE streams
  PCI/IDE: Add Address Association Register setup for downstream MMIO
  resource: Introduce resource_assigned() for discerning active resources
  PCI/TSM: Drop stub for pci_tsm_doe_transfer()
  drivers/virt: Drop VIRT_DRIVERS build dependency
  PCI/TSM: Report active IDE streams
  PCI/IDE: Report available IDE streams
  PCI/IDE: Add IDE establishment helpers
  PCI: Establish document for PCI host bridge sysfs attributes
  PCI: Add PCIe Device 3 Extended Capability enumeration
  PCI/TSM: Establish Secure Sessions and Link Encryption
  ...
2025-12-06 10:15:41 -08:00
Dave PenklerandGreg Kroah-Hartman e6ab504633 staging: gpib: Destage gpib
Move the gpib drivers out of staging and into the "real" part of the
kernel.  This entails:

 - Remove the gpib Kconfig menu and Makefile build rule from staging.
 - Remove gpib/uapi from the header file search path in subdir-ccflags
   of the gpib Makefile
 - move the gpib/uapi files to include/uapi/linux
 - Move the gpib tree out of staging to drivers.
 - Remove the word "Linux" from the gpib Kconfig file.
 - Add the gpib Kconfig menu and Makefile build rule to drivers

Signed-off-by: Dave Penkler <dpenkler@gmail.com>
Link: https://patch.msgid.link/20251117144021.23569-5-dpenkler@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2025-11-24 17:52:11 +01:00
James MorseandCatalin Marinas f04046f257 arm_mpam: Add probe/remove for mpam msc driver and kbuild boiler plate
Probing MPAM is convoluted. MSCs that are integrated with a CPU may
only be accessible from those CPUs, and they may not be online.
Touching the hardware early is pointless as MPAM can't be used until
the system-wide common values for num_partid and num_pmg have been
discovered.

Start with driver probe/remove and mapping the MSC.

Cc: Carl Worth <carl@os.amperecomputing.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com>
Tested-by: Gavin Shan <gshan@redhat.com>
Tested-by: Zeng Heng <zengheng4@huawei.com>
Tested-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2025-11-19 18:34:20 +00:00
Dan Williams 110c155e8a drivers/virt: Drop VIRT_DRIVERS build dependency
All of the objects in drivers/virt/ have their own configuration symbols to
gate compilation. I.e. nothing gets added to the kernel with
CONFIG_VIRT_DRIVERS=y in isolation.

Unconditionally descend into drivers/virt/ so that consumers do not need to
add an additional CONFIG_VIRT_DRIVERS dependency.

Fix warnings of the form:

    Kconfig warnings: (for reference only)
       WARNING: unmet direct dependencies detected for TSM
       Depends on [n]: VIRT_DRIVERS [=n]
       Selected by [y]:
       - PCI_TSM [=y] && PCI [=y]

...where PCI_TSM selects CONFIG_TSM, but fails to select
CONFIG_VIRT_DRIVERS.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202511041832.ylcgIiqN-lkp@intel.com/
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Link: https://patch.msgid.link/20251113021446.436830-2-dan.j.williams@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2025-11-13 17:05:08 -08:00
Linus Torvalds 2215336295 Merge tag 'hyperv-next-signed-20251006' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux
Pull hyperv updates from Wei Liu:

 - Unify guest entry code for KVM and MSHV (Sean Christopherson)

 - Switch Hyper-V MSI domain to use msi_create_parent_irq_domain()
   (Nam Cao)

 - Add CONFIG_HYPERV_VMBUS and limit the semantics of CONFIG_HYPERV
   (Mukesh Rathor)

 - Add kexec/kdump support on Azure CVMs (Vitaly Kuznetsov)

 - Deprecate hyperv_fb in favor of Hyper-V DRM driver (Prasanna
   Kumar T S M)

 - Miscellaneous enhancements, fixes and cleanups (Abhishek Tiwari,
   Alok Tiwari, Nuno Das Neves, Wei Liu, Roman Kisel, Michael Kelley)

* tag 'hyperv-next-signed-20251006' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux:
  hyperv: Remove the spurious null directive line
  MAINTAINERS: Mark hyperv_fb driver Obsolete
  fbdev/hyperv_fb: deprecate this in favor of Hyper-V DRM driver
  Drivers: hv: Make CONFIG_HYPERV bool
  Drivers: hv: Add CONFIG_HYPERV_VMBUS option
  Drivers: hv: vmbus: Fix typos in vmbus_drv.c
  Drivers: hv: vmbus: Fix sysfs output format for ring buffer index
  Drivers: hv: vmbus: Clean up sscanf format specifier in target_cpu_store()
  x86/hyperv: Switch to msi_create_parent_irq_domain()
  mshv: Use common "entry virt" APIs to do work in root before running guest
  entry: Rename "kvm" entry code assets to "virt" to genericize APIs
  entry/kvm: KVM: Move KVM details related to signal/-EINTR into KVM proper
  mshv: Handle NEED_RESCHED_LAZY before transferring to guest
  x86/hyperv: Add kexec/kdump support on Azure CVMs
  Drivers: hv: Simplify data structures for VMBus channel close message
  Drivers: hv: util: Cosmetic changes for hv_utils_transport.c
  mshv: Add support for a new parent partition configuration
  clocksource: hyper-v: Skip unnecessary checks for the root partition
  hyperv: Add missing field to hv_output_map_device_interrupt
2025-10-07 08:40:15 -07:00
Mukesh RathorandWei Liu e3ec97c3ab Drivers: hv: Make CONFIG_HYPERV bool
With CONFIG_HYPERV and CONFIG_HYPERV_VMBUS separated, change CONFIG_HYPERV
to bool from tristate. CONFIG_HYPERV now becomes the core Hyper-V
hypervisor support, such as hypercalls, clocks/timers, Confidential
Computing setup, PCI passthru, etc. that doesn't involve VMBus or VMBus
devices.

Signed-off-by: Mukesh Rathor <mrathor@linux.microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
2025-10-01 00:00:45 +00:00
Alexandra WinterandPaolo Abeni 35758b0032 dibs: Create drivers/dibs
Create the file structure for a 'DIBS - Direct Internal Buffer Sharing'
shim layer that will provide generic functionality and declarations for
dibs device drivers and dibs clients.

Following patches will add functionality.

Signed-off-by: Alexandra Winter <wintera@linux.ibm.com>
Link: https://patch.msgid.link/20250918110500.1731261-4-wintera@linux.ibm.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2025-09-23 11:13:21 +02:00
Jason Gunthorpe 2e4986cf2d fwctl: Add basic structure for a class subsystem with a cdev
Create the class, character device and functions for a fwctl driver to
un/register to the subsystem.

A typical fwctl driver has a sysfs presence like:

$ ls -l /dev/fwctl/fwctl0
crw------- 1 root root 250, 0 Apr 25 19:16 /dev/fwctl/fwctl0

$ ls /sys/class/fwctl/fwctl0
dev  device  power  subsystem  uevent

$ ls /sys/class/fwctl/fwctl0/device/infiniband/
ibp0s10f0

$ ls /sys/class/infiniband/ibp0s10f0/device/fwctl/
fwctl0/

$ ls /sys/devices/pci0000:00/0000:00:0a.0/fwctl/fwctl0
dev  device  power  subsystem  uevent

Which allows userspace to link all the multi-subsystem driver components
together and learn the subsystem specific names for the device's
components.

Link: https://patch.msgid.link/r/1-v5-642aa0c94070+4447f-fwctl_jgg@nvidia.com
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Shannon Nelson <shannon.nelson@amd.com>
Tested-by: Dave Jiang <dave.jiang@intel.com>
Tested-by: Shannon Nelson <shannon.nelson@amd.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
2025-03-06 15:11:30 -04:00
Mariusz TkaczykandBjorn Helgaas 78efa53e71 leds: Init leds class earlier
NPEM driver will require leds class, there is an init-order conflict.
Make sure that LEDs initialization happens first and add comment.

Link: https://lore.kernel.org/r/20240904104848.23480-2-mariusz.tkaczyk@linux.intel.com
Suggested-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Stuart Hayes <stuart.w.hayes@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
2024-09-04 17:24:58 -05:00
Masahiro Yamada b1992c3772 kbuild: use $(src) instead of $(srctree)/$(src) for source directory
Kbuild conventionally uses $(obj)/ for generated files, and $(src)/ for
checked-in source files. It is merely a convention without any functional
difference. In fact, $(obj) and $(src) are exactly the same, as defined
in scripts/Makefile.build:

    src := $(obj)

When the kernel is built in a separate output directory, $(src) does
not accurately reflect the source directory location. While Kbuild
resolves this discrepancy by specifying VPATH=$(srctree) to search for
source files, it does not cover all cases. For example, when adding a
header search path for local headers, -I$(srctree)/$(src) is typically
passed to the compiler.

This introduces inconsistency between upstream and downstream Makefiles
because $(src) is used instead of $(srctree)/$(src) for the latter.

To address this inconsistency, this commit changes the semantics of
$(src) so that it always points to the directory in the source tree.

Going forward, the variables used in Makefiles will have the following
meanings:

  $(obj)     - directory in the object tree
  $(src)     - directory in the source tree  (changed by this commit)
  $(objtree) - the top of the kernel object tree
  $(srctree) - the top of the kernel source tree

Consequently, $(srctree)/$(src) in upstream Makefiles need to be replaced
with $(src).

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
2024-05-10 04:34:52 +09:00
Duje MihanovićandLee Jones 041d2a0ea7 Revert "leds: Only descend into leds directory when CONFIG_NEW_LEDS is set"
This reverts commit b1ae40a5db.

The ExpressWire library introduced in commit 25ae5f5f4168 ("leds:
Introduce ExpressWire library") does not depend on NEW_LEDS, but without
this revert it would never get compiled if NEW_LEDS is not enabled.
Revert this commit to allow the library to be compiled.

Link: https://lore.kernel.org/2cacd8dc-6150-4aa2-af9e-830a202fb0a8@app.fastmail.com
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Duje Mihanović <duje.mihanovic@skole.hr>
Link: https://lore.kernel.org/r/20240216-expresswire-deps-v2-1-8be59c4a75f5@skole.hr
Signed-off-by: Lee Jones <lee@kernel.org>
2024-03-07 08:48:10 +00:00
Thomas ZimmermannandHelge Deller 689237ab37 fbdev/intelfb: Remove driver
From looking at the PCI IDs, every device supported by intelfb is
also supported by i915. Anyone still using intelfb should please
move on to i915, which does everything intelfb does but better.

Removing intelfb is motivated by the driver's excessive use of the
global screen_info state. The state belongs to architecture and
firmware code; device drivers should not attempt to access it. But
fixing intelfb would require a significant change in the driver's
probing logic. As intelfb has been obsolete for nearly 2 decades,
it is probably not worth the effort. Let's just remove it. Also
remove the related documentation.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Maik Broemme <mbroemme@libmpq.org>
Signed-off-by: Helge Deller <deller@gmx.de>
2024-01-12 12:38:37 +01:00
Linus Torvalds 656d88c3b6 Merge tag 'mips_6.7' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux
Pull MIPS updates from Thomas Bogendoerfer:

 - removed AR7 platform support

 - cleanups and fixes

* tag 'mips_6.7' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux:
  MIPS: AR7: remove platform
  watchdog: ar7_wdt: remove driver to prepare for platform removal
  vlynq: remove bus driver
  mtd: parsers: ar7: remove support
  serial: 8250: remove AR7 support
  arch: mips: remove ReiserFS from defconfig
  MIPS: lantiq: Remove unnecessary include of <linux/of_irq.h>
  MIPS: lantiq: Fix pcibios_plat_dev_init() "no previous prototype" warning
  MIPS: KVM: Fix a build warning about variable set but not used
  MIPS: Remove dead code in relocate_new_kernel
  mips: dts: ralink: mt7621: rename to GnuBee GB-PC1 and GnuBee GB-PC2
  mips: dts: ralink: mt7621: define each reset as an item
  mips: dts: ingenic: Remove unneeded probe-type properties
  MIPS: loongson32: Remove dma.h and nand.h
2023-11-10 09:19:46 -08:00
Wolfram SangandThomas Bogendoerfer 9a6c782158 vlynq: remove bus driver
There are no users with a vlynq_driver in the Kernel tree. Also, only
the AR7 platform ever initialized a VLYNQ bus, but AR7 is going to be
removed from the Kernel. OpenWRT had some out-of-tree drivers which they
probably intended to upport, but AR7 devices are even there not
supported anymore because they are "stuck with Kernel
3.18" [1]. This code can go.

[1] https://openwrt.org/docs/techref/targets/ar7

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2023-10-19 10:33:10 +02:00
Vadim FedorenkoandDavid S. Miller 9431063ad3 dpll: core: Add DPLL framework base functions
DPLL framework is used to represent and configure DPLL devices
in systems. Each device that has DPLL and can configure inputs
and outputs can use this framework.

Implement core framework functions for further interactions
with device drivers implementing dpll subsystem, as well as for
interactions of DPLL netlink framework part with the subsystem
itself.

Co-developed-by: Milena Olech <milena.olech@intel.com>
Signed-off-by: Milena Olech <milena.olech@intel.com>
Co-developed-by: Michal Michalik <michal.michalik@intel.com>
Signed-off-by: Michal Michalik <michal.michalik@intel.com>
Signed-off-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Co-developed-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@intel.com>
Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@intel.com>
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2023-09-17 11:50:20 +01:00
Ulf Hansson e2ad626f8f pmdomain: Rename the genpd subsystem to pmdomain
It has been pointed out that naming a subsystem "genpd" isn't very
self-explanatory and the acronym itself that means Generic PM Domain, is
known only by a limited group of people.

In a way to improve the situation, let's rename the subsystem to pmdomain,
which ideally should indicate that this is about so called Power Domains or
"PM domains" as we often also use within the Linux Kernel terminology.

Suggested-by: Rafael J. Wysocki <rafael@kernel.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20230912221127.487327-1-ulf.hansson@linaro.org
2023-09-13 11:09:21 +02:00
Palmer Dabbelt c23be918c5 Merge patch series "Add non-coherent DMA support for AX45MP"
Prabhakar <prabhakar.csengg@gmail.com> says:

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

non-coherent DMA support for AX45MP
====================================

On the Andes AX45MP core, cache coherency is a specification option so it
may not be supported. In this case DMA will fail. To get around with this
issue this patch series does the below:

1] Andes alternative ports is implemented as errata which checks if the
IOCP is missing and only then applies to CMO errata. One vendor specific
SBI EXT (ANDES_SBI_EXT_IOCP_SW_WORKAROUND) is implemented as part of
errata.

Below are the configs which Andes port provides (and are selected by
RZ/Five):
      - ERRATA_ANDES
      - ERRATA_ANDES_CMO

OpenSBI patch supporting ANDES_SBI_EXT_IOCP_SW_WORKAROUND SBI is now
part v1.3 release.

2] Andes AX45MP core has a Programmable Physical Memory Attributes (PMA)
block that allows dynamic adjustment of memory attributes in the runtime.
It contains a configurable amount of PMA entries implemented as CSR
registers to control the attributes of memory locations in interest.
OpenSBI configures the PMA regions as required and creates a reserve memory
node and propagates it to the higher boot stack.

Currently OpenSBI (upstream) configures the required PMA region and passes
this a shared DMA pool to Linux.

    reserved-memory {
        #address-cells = <2>;
        #size-cells = <2>;
        ranges;

        pma_resv0@58000000 {
            compatible = "shared-dma-pool";
            reg = <0x0 0x58000000 0x0 0x08000000>;
            no-map;
            linux,dma-default;
        };
    };

The above shared DMA pool gets appended to Linux DTB so the DMA memory
requests go through this region.

3] We provide callbacks to synchronize specific content between memory and
cache.

4] RZ/Five SoC selects the below configs
        - AX45MP_L2_CACHE
        - DMA_GLOBAL_POOL
        - ERRATA_ANDES
        - ERRATA_ANDES_CMO

----------x---------------------x--------------------x---------------x----

* b4-shazam-merge:
  soc: renesas: Kconfig: Select the required configs for RZ/Five SoC
  cache: Add L2 cache management for Andes AX45MP RISC-V core
  dt-bindings: cache: andestech,ax45mp-cache: Add DT binding documentation for L2 cache controller
  riscv: mm: dma-noncoherent: nonstandard cache operations support
  riscv: errata: Add Andes alternative ports
  riscv: asm: vendorid_list: Add Andes Technology to the vendors list

Link: https://lore.kernel.org/r/20230818135723.80612-1-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
2023-09-08 11:24:34 -07:00
Lad PrabhakarandPalmer Dabbelt d34599bcd2 cache: Add L2 cache management for Andes AX45MP RISC-V core
I/O Coherence Port (IOCP) provides an AXI interface for connecting
external non-caching masters, such as DMA controllers. The accesses
from IOCP are coherent with D-Caches and L2 Cache.

IOCP is a specification option and is disabled on the Renesas RZ/Five
SoC due to this reason IP blocks using DMA will fail.

The Andes AX45MP core has a Programmable Physical Memory Attributes (PMA)
block that allows dynamic adjustment of memory attributes in the runtime.
It contains a configurable amount of PMA entries implemented as CSR
registers to control the attributes of memory locations in interest.
Below are the memory attributes supported:
* Device, Non-bufferable
* Device, bufferable
* Memory, Non-cacheable, Non-bufferable
* Memory, Non-cacheable, Bufferable
* Memory, Write-back, No-allocate
* Memory, Write-back, Read-allocate
* Memory, Write-back, Write-allocate
* Memory, Write-back, Read and Write-allocate

More info about PMA (section 10.3):
Link: http://www.andestech.com/wp-content/uploads/AX45MP-1C-Rev.-5.0.0-Datasheet.pdf

As a workaround for SoCs with IOCP disabled CMO needs to be handled by
software. Firstly OpenSBI configures the memory region as
"Memory, Non-cacheable, Bufferable" and passes this region as a global
shared dma pool as a DT node. With DMA_GLOBAL_POOL enabled all DMA
allocations happen from this region and synchronization callbacks are
implemented to synchronize when doing DMA transactions.

Example PMA region passes as a DT node from OpenSBI:
    reserved-memory {
        #address-cells = <2>;
        #size-cells = <2>;
        ranges;

        pma_resv0@58000000 {
            compatible = "shared-dma-pool";
            reg = <0x0 0x58000000 0x0 0x08000000>;
            no-map;
            linux,dma-default;
        };
    };

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Tested-by: Conor Dooley <conor.dooley@microchip.com> # tyre-kicking on a d1
Link: https://lore.kernel.org/r/20230818135723.80612-6-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
2023-09-01 09:08:59 -07:00
Linus Torvalds c66403f627 Merge tag 'genpd-v6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/linux-pm
Pull ARM SoC generic power domain driver updates from Ulf Hansson:
 "This adds a new subsystem for generic power domain providers in
  drivers/genpd and starts moving some of the corresponding code in
  there.

  We have currently ~60 users of the genpd provider interface, which are
  sprinkled across various subsystems. To release some burden from the
  soc maintainers (Arnd Bergmann, etc) in particular, but also to gain a
  better overall view of what goes on in the area, I will help out with
  maintenance"

[ I find the "genpd" name singularly uninformative, so we'll probably
  end up moving this driver subsystem somewhere else, but that's still
  being discussed  - Linus ]

* tag 'genpd-v6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/linux-pm: (30 commits)
  genpd: ti: Use for_each_node_with_property() simplify code logic
  genpd: Explicitly include correct DT includes
  genpd: imx: scu-pd: initialize is_off according to HW state
  genpd: imx: scu-pd: Suppress bind attrs
  genpd: imx: scu-pd: do not power off console if no_console_suspend
  genpd: imx: scu-pd: add more PDs
  genpd: imx: scu-pd: enlarge PD range
  genpd: imx: relocate scu-pd under genpd
  MAINTAINERS: adjust file entry in STARFIVE JH71XX PMU CONTROLLER DRIVER
  genpd: Makefile: build imx
  genpd: move owl-sps-helper.c from drivers/soc
  soc: starfive: remove stale Makefile entry
  ARM: ux500: Move power-domain driver to the genpd dir
  ARM: ux500: Convert power-domain code into a regular platform driver
  soc: xilinx: Move power-domain driver to the genpd dir
  soc: ti: Mover power-domain drivers to the genpd dir
  soc: tegra: Move powergate-bpmp driver to the genpd dir
  soc: sunxi: Move power-domain driver to the genpd dir
  soc: starfive: Move the power-domain driver to the genpd dir
  soc: samsung: Move power-domain driver to the genpd dir
  ...
2023-08-30 16:37:00 -07:00
Masahiro YamadaandHeiko Carstens 305b9f4f7b s390: use obj-y to descend into drivers/s390/
The single build rule does not work with the drivers-y syntax. [1]

Use the standard obj-y syntax. It moves the objects from drivers/s390/
to slightly lower address, but fixes the reported issue.

[1]: https://lore.kernel.org/linux-kbuild/d57ba55f-20a3-b836-783d-b49c8a161b6e@kernel.org/T/#m27f781ab60acadfed8a9e9642f30d5414a5e2df3

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Tested-by: Jiri Slaby <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20230721171358.3612099-1-masahiroy@kernel.org
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2023-07-24 12:12:25 +02:00
Ulf Hansson c1e213e547 genpd: Create a new subsystem directory to host genpd providers
There are currently ~60 users of the genpd provider interface, which
implementations are sprinkled across various subsystems. To simplify with
maintenance let's create a new subsystem (drivers/genpd) and start moving
the providers in there.

My intention is also to host a git tree to collect and to get the patches
tested/integrated through the linux-next tree. Ideally this should release
some of the burden on the soc maintainers.

Note that, I will of course require acks/reviews from the current platform
maintainers, hence the MAINTAINERS file needs to be updated accordingly for
each genpd provider that is moved into the new genpd subsystem.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2023-07-11 15:29:38 +02:00
Nipun GuptaandGreg Kroah-Hartman 2959ab2470 cdx: add the cdx bus driver
Introduce AMD CDX bus, which provides a mechanism for scanning
and probing CDX devices. These devices are memory mapped on
system bus for Application Processors(APUs).

CDX devices can be changed dynamically in the Fabric and CDX
bus interacts with CDX controller to rescan the bus and
rediscover the devices.

Signed-off-by: Nipun Gupta <nipun.gupta@amd.com>
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Tested-by: Nikhil Agarwal <nikhil.agarwal@amd.com>
Link: https://lore.kernel.org/r/20230313132636.31850-2-nipun.gupta@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-03-29 12:26:32 +02:00