Merge branch 'next' into for-linus

Prepare input updates for 6.12 merge window.

Merge branch 'ib/6.11-rc6-matrix-keypad-spitz' into next

Bring in changes removing support for platform data from matrix-keypad
driver.

Merge tag 'v6.11-rc1' into clk-meson-next

Linux 6.11-rc1

Merge tag 'v6.11-rc3' into trace/ring-buffer/core

The "reserve_mem" kernel command line parameter has been pulled into
v6.11. Merge the latest -rc3 to allow the persistent ring buffer memory to
be a

Merge tag 'v6.11-rc3' into trace/ring-buffer/core

The "reserve_mem" kernel command line parameter has been pulled into
v6.11. Merge the latest -rc3 to allow the persistent ring buffer memory to
be able to be mapped at the address specified by the "reserve_mem" command
line parameter.

Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

show more ...

Merge tag 'v6.11-rc1' into for-6.12

Linux 6.11-rc1

Merge branch 'bpf/for-next' into sched_ext-base

Merge drm/drm-next into drm-xe-next

Get drm-xe-next on v6.11-rc2 and synchronized with drm-intel-next for
the display side. This resolves the current conflict for the
enable_display module parameter

Merge drm/drm-next into drm-xe-next

Get drm-xe-next on v6.11-rc2 and synchronized with drm-intel-next for
the display side. This resolves the current conflict for the
enable_display module parameter and allows further pending refactors.

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>

show more ...

Merge drm/drm-next into drm-misc-next

Get drm-misc-next to the state of v6.11-rc2.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>

Merge drm/drm-next into drm-intel-next

Sync with v6.11-rc1 in general, and specifically get the new
BACKLIGHT_POWER_ constants for power states.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>

Merge branch 'linus' into x86/mm

Bring x86 and selftests up to date

Merge drm/drm-fixes into drm-misc-fixes

Let's start the new drm-misc-fixes cycle by bringing in 6.11-rc1.

Signed-off-by: Maxime Ripard <mripard@kernel.org>

Merge branch 'next' into for-linus

Prepare input updates for 6.11 merge window.

Merge tag 'v6.9' into next

Sync up with the mainline to bring in the new cleanup API.

Merge drm/drm-next into drm-intel-gt-next

Some display refactoring patches are needed in order to allow conflict-
less merging.

Signed-off-by: Tvrtko Ursulin <tursulin@ursulin.net>

Merge tag 'net-next-6.11' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next

Pull networking updates from Jakub Kicinski:
"Not much excitement - a handful of large patchsets (devmem a

Merge tag 'net-next-6.11' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next

Pull networking updates from Jakub Kicinski:
"Not much excitement - a handful of large patchsets (devmem among them)
did not make it in time.

Core & protocols:

- Use local_lock in addition to local_bh_disable() to protect per-CPU
resources in networking, a step closer for local_bh_disable() not
to act as a big lock on PREEMPT_RT

- Use flex array for netdevice priv area, ensure its cache alignment

- Add a sysctl knob to allow user to specify a default rto_min at
socket init time. Bit of a big hammer but multiple companies were
independently carrying such patch downstream so clearly it's useful

- Support scheduling transmission of packets based on CLOCK_TAI

- Un-pin TCP TIMEWAIT timer to avoid it firing on CPUs later cordoned
off using cpusets

- Support multiple L2TPv3 UDP tunnels using the same 5-tuple address

- Allow configuration of multipath hash seed, to both allow
synchronizing hashing of two routers, and preventing partial
accidental sync

- Improve TCP compliance with RFC 9293 for simultaneous connect()

- Support sending NAT keepalives in IPsec ESP in UDP states.
Userspace IKE daemon had to do this before, but the kernel can
better keep track of it

- Support sending supervision HSR frames with MAC addresses stored in
ProxyNodeTable when RedBox (i.e. HSR-SAN) is enabled

- Introduce IPPROTO_SMC for selecting SMC when socket is created

- Allow UDP GSO transmit from devices with no checksum offload

- openvswitch: add packet sampling via psample, separating the
sampled traffic from "upcall" packets sent to user space for
forwarding

- nf_tables: shrink memory consumption for transaction objects

Things we sprinkled into general kernel code:

- Power Sequencing subsystem (used by Qualcomm Bluetooth driver for
QCA6390) [ Already merged separately - Linus ]

- Add IRQ information in sysfs for auxiliary bus

- Introduce guard definition for local_lock

- Add aligned flavor of __cacheline_group_{begin, end}() markings for
grouping fields in structures

BPF:

- Notify user space (via epoll) when a struct_ops object is getting
detached/unregistered

- Add new kfuncs for a generic, open-coded bits iterator

- Enable BPF programs to declare arrays of kptr, bpf_rb_root, and
bpf_list_head

- Support resilient split BTF which cuts down on duplication and
makes BTF as compact as possible WRT BTF from modules

- Add support for dumping kfunc prototypes from BTF which enables
both detecting as well as dumping compilable prototypes for kfuncs

- riscv64 BPF JIT improvements in particular to add 12-argument
support for BPF trampolines and to utilize bpf_prog_pack for the
latter

- Add the capability to offload the netfilter flowtable in XDP layer
through kfuncs

Driver API:

- Allow users to configure IRQ tresholds between which automatic IRQ
moderation can choose

- Expand Power Sourcing (PoE) status with power, class and failure
reason. Support setting power limits

- Track additional RSS contexts in the core, make sure configuration
changes don't break them

- Support IPsec crypto offload for IPv6 ESP and IPv4 UDP-encapsulated
ESP data paths

- Support updating firmware on SFP modules

Tests and tooling:

- mptcp: use net/lib.sh to manage netns

- TCP-AO and TCP-MD5: replace debug prints used by tests with
tracepoints

- openvswitch: make test self-contained (don't depend on OvS CLI
tools)

Drivers:

- Ethernet high-speed NICs:
- Broadcom (bnxt):
- increase the max total outstanding PTP TX packets to 4
- add timestamping statistics support
- implement netdev_queue_mgmt_ops
- support new RSS context API
- Intel (100G, ice, idpf):
- implement FEC statistics and dumping signal quality indicators
- support E825C products (with 56Gbps PHYs)
- nVidia/Mellanox:
- support HW-GRO
- mlx4/mlx5: support per-queue statistics via netlink
- obey the max number of EQs setting in sub-functions
- AMD/Solarflare:
- support new RSS context API
- AMD/Pensando:
- ionic: rework fix for doorbell miss to lower overhead and
skip it on new HW
- Wangxun:
- txgbe: support Flow Director perfect filters

- Ethernet NICs consumer, embedded and virtual:
- Add driver for Tehuti Networks TN40xx chips
- Add driver for Meta's internal NIC chips
- Add driver for Ethernet MAC on Airoha EN7581 SoCs
- Add driver for Renesas Ethernet-TSN devices
- Google cloud vNIC:
- flow steering support
- Microsoft vNIC:
- support page sizes other than 4KB on ARM64
- vmware vNIC:
- support latency measurement (update to version 9)
- VirtIO net:
- support for Byte Queue Limits
- support configuring thresholds for automatic IRQ moderation
- support for AF_XDP Rx zero-copy
- Synopsys (stmmac):
- support for STM32MP13 SoC
- let platforms select the right PCS implementation
- TI:
- icssg-prueth: add multicast filtering support
- icssg-prueth: enable PTP timestamping and PPS
- Renesas:
- ravb: improve Rx performance 30-400% by using page pool,
theaded NAPI and timer-based IRQ coalescing
- ravb: add MII support for R-Car V4M
- Cadence (macb):
- macb: add ARP support to Wake-On-LAN
- Cortina:
- use phylib for RX and TX pause configuration

- Ethernet switches:
- nVidia/Mellanox:
- support configuration of multipath hash seed
- report more accurate max MTU
- use page_pool to improve Rx performance
- MediaTek:
- mt7530: add support for bridge port isolation
- Qualcomm:
- qca8k: add support for bridge port isolation
- Microchip:
- lan9371/2: add 100BaseTX PHY support
- NXP:
- vsc73xx: implement VLAN operations

- Ethernet PHYs:
- aquantia: enable support for aqr115c
- aquantia: add support for PHY LEDs
- realtek: add support for rtl8224 2.5Gbps PHY
- xpcs: add memory-mapped device support
- add BroadR-Reach link mode and support in Broadcom's PHY driver

- CAN:
- add document for ISO 15765-2 protocol support
- mcp251xfd: workaround for erratum DS80000789E, use timestamps to
catch when device returns incorrect FIFO status

- WiFi:
- mac80211/cfg80211:
- parse Transmit Power Envelope (TPE) data in mac80211 instead
of in drivers
- improvements for 6 GHz regulatory flexibility
- multi-link improvements
- support multiple radios per wiphy
- remove DEAUTH_NEED_MGD_TX_PREP flag
- Intel (iwlwifi):
- bump FW API to 91 for BZ/SC devices
- report 64-bit radiotap timestamp
- enable P2P low latency by default
- handle Transmit Power Envelope (TPE) advertised by AP
- remove support for older FW for new devices
- fast resume (keeping the device configured)
- mvm: re-enable Multi-Link Operation (MLO)
- aggregation (A-MSDU) optimizations
- MediaTek (mt76):
- mt7925 Multi-Link Operation (MLO) support
- Qualcomm (ath10k):
- LED support for various chipsets
- Qualcomm (ath12k):
- remove unsupported Tx monitor handling
- support channel 2 in 6 GHz band
- support Spatial Multiplexing Power Save (SMPS) in 6 GHz band
- supprt multiple BSSID (MBSSID) and Enhanced Multi-BSSID
Advertisements (EMA)
- support dynamic VLAN
- add panic handler for resetting the firmware state
- DebugFS support for datapath statistics
- WCN7850: support for Wake on WLAN
- Microchip (wilc1000):
- read MAC address during probe to make it visible to user space
- suspend/resume improvements
- TI (wl18xx):
- support newer firmware versions
- RealTek (rtw89):
- preparation for RTL8852BE-VT support
- Wake on WLAN support for WiFi 6 chips
- 36-bit PCI DMA support
- RealTek (rtlwifi):
- RTL8192DU support
- Broadcom (brcmfmac):
- Management Frame Protection support (to enable WPA3)

- Bluetooth:
- qualcomm: use the power sequencer for QCA6390
- btusb: mediatek: add ISO data transmission functions
- hci_bcm4377: add BCM4388 support
- btintel: add support for BlazarU core
- btintel: add support for Whale Peak2
- btnxpuart: add support for AW693 A1 chipset
- btnxpuart: add support for IW615 chipset
- btusb: add Realtek RTL8852BE support ID 0x13d3:0x3591"

* tag 'net-next-6.11' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1589 commits)
eth: fbnic: Fix spelling mistake "tiggerring" -> "triggering"
tcp: Replace strncpy() with strscpy()
wifi: ath12k: fix build vs old compiler
tcp: Don't access uninit tcp_rsk(req)->ao_keyid in tcp_create_openreq_child().
eth: fbnic: Write the TCAM tables used for RSS control and Rx to host
eth: fbnic: Add L2 address programming
eth: fbnic: Add basic Rx handling
eth: fbnic: Add basic Tx handling
eth: fbnic: Add link detection
eth: fbnic: Add initial messaging to notify FW of our presence
eth: fbnic: Implement Rx queue alloc/start/stop/free
eth: fbnic: Implement Tx queue alloc/start/stop/free
eth: fbnic: Allocate a netdevice and napi vectors with queues
eth: fbnic: Add FW communication mechanism
eth: fbnic: Add message parsing for FW messages
eth: fbnic: Add register init to set PCIe/Ethernet device config
eth: fbnic: Allocate core device specific structures and devlink interface
eth: fbnic: Add scaffolding for Meta's NIC driver
PCI: Add Meta Platforms vendor ID
net/sched: cls_flower: propagate tca[TCA_OPTIONS] to NL_REQ_ATTR_CHECK
...

show more ...

Merge tag 'for-netdev' of https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

Daniel Borkmann says:

====================
pull-request: bpf-next 2024-07-08

The following pull-request conta

Merge tag 'for-netdev' of https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

Daniel Borkmann says:

====================
pull-request: bpf-next 2024-07-08

The following pull-request contains BPF updates for your *net-next* tree.

We've added 102 non-merge commits during the last 28 day(s) which contain
a total of 127 files changed, 4606 insertions(+), 980 deletions(-).

The main changes are:

1) Support resilient split BTF which cuts down on duplication and makes BTF
as compact as possible wrt BTF from modules, from Alan Maguire & Eduard Zingerman.

2) Add support for dumping kfunc prototypes from BTF which enables both detecting
as well as dumping compilable prototypes for kfuncs, from Daniel Xu.

3) Batch of s390x BPF JIT improvements to add support for BPF arena and to implement
support for BPF exceptions, from Ilya Leoshkevich.

4) Batch of riscv64 BPF JIT improvements in particular to add 12-argument support
for BPF trampolines and to utilize bpf_prog_pack for the latter, from Pu Lehui.

5) Extend BPF test infrastructure to add a CHECKSUM_COMPLETE validation option
for skbs and add coverage along with it, from Vadim Fedorenko.

6) Inline bpf_get_current_task/_btf() helpers in the arm64 BPF JIT which gives
a small 1% performance improvement in micro-benchmarks, from Puranjay Mohan.

7) Extend the BPF verifier to track the delta between linked registers in order
to better deal with recent LLVM code optimizations, from Alexei Starovoitov.

8) Fix bpf_wq_set_callback_impl() kfunc signature where the third argument should
have been a pointer to the map value, from Benjamin Tissoires.

9) Extend BPF selftests to add regular expression support for test output matching
and adjust some of the selftest when compiled under gcc, from Cupertino Miranda.

10) Simplify task_file_seq_get_next() and remove an unnecessary loop which always
iterates exactly once anyway, from Dan Carpenter.

11) Add the capability to offload the netfilter flowtable in XDP layer through
kfuncs, from Florian Westphal & Lorenzo Bianconi.

12) Various cleanups in networking helpers in BPF selftests to shave off a few
lines of open-coded functions on client/server handling, from Geliang Tang.

13) Properly propagate prog->aux->tail_call_reachable out of BPF verifier, so
that x86 JIT does not need to implement detection, from Leon Hwang.

14) Fix BPF verifier to add a missing check_func_arg_reg_off() to prevent an
out-of-bounds memory access for dynpointers, from Matt Bobrowski.

15) Fix bpf_session_cookie() kfunc to return __u64 instead of long pointer as
it might lead to problems on 32-bit archs, from Jiri Olsa.

16) Enhance traffic validation and dynamic batch size support in xsk selftests,
from Tushar Vyavahare.

bpf-next-for-netdev

* tag 'for-netdev' of https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next: (102 commits)
selftests/bpf: DENYLIST.aarch64: Remove fexit_sleep
selftests/bpf: amend for wrong bpf_wq_set_callback_impl signature
bpf: helpers: fix bpf_wq_set_callback_impl signature
libbpf: Add NULL checks to bpf_object__{prev_map,next_map}
selftests/bpf: Remove exceptions tests from DENYLIST.s390x
s390/bpf: Implement exceptions
s390/bpf: Change seen_reg to a mask
bpf: Remove unnecessary loop in task_file_seq_get_next()
riscv, bpf: Optimize stack usage of trampoline
bpf, devmap: Add .map_alloc_check
selftests/bpf: Remove arena tests from DENYLIST.s390x
selftests/bpf: Add UAF tests for arena atomics
selftests/bpf: Introduce __arena_global
s390/bpf: Support arena atomics
s390/bpf: Enable arena
s390/bpf: Support address space cast instruction
s390/bpf: Support BPF_PROBE_MEM32
s390/bpf: Land on the next JITed instruction after exception
s390/bpf: Introduce pre- and post- probe functions
s390/bpf: Get rid of get_probe_mem_regno()
...
====================

Link: https://patch.msgid.link/20240708221438.10974-1-daniel@iogearbox.net
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

show more ...

Merge branch 'bpf-resilient-split-btf-followups'

Alan Maguire says:

====================
bpf: resilient split BTF followups

Follow-up to resilient split BTF series [1],

- cleaning up libbpf reloc

Merge branch 'bpf-resilient-split-btf-followups'

Alan Maguire says:

====================
bpf: resilient split BTF followups

Follow-up to resilient split BTF series [1],

- cleaning up libbpf relocation code (patch 1);
- adding 'struct module' support for base BTF data (patch 2);
- splitting out field iteration code into separate file (patch 3);
- sharing libbpf relocation code with the kernel (patch 4);
- adding a kbuild --btf_features flag to generate distilled base
BTF in the module-specific case where KBUILD_EXTMOD is true
(patch 5); and
- adding test coverage for module-based kfunc dtor (patch 6)

Generation of distilled base BTF for modules requires the pahole patch
at [2], but without it we just won't get distilled base BTF (and thus BTF
relocation on module load) for bpf_testmod.ko.

Changes since v1 [3]:

- fixed line lengths and made comparison an explicit == 0 (Andrii, patch 1)
- moved btf_iter.c changes to separate patch (Andrii, patch 3)
- grouped common targets in kernel/bpf/Makefile (Andrii, patch 4)
- updated bpf_testmod ctx alloc to use GFP_ATOMIC, and updated dtor
selftest to use map-based dtor cleanup (Eduard, patch 6)

[1] https://lore.kernel.org/bpf/20240613095014.357981-1-alan.maguire@oracle.com/
[2] https://lore.kernel.org/bpf/20240517102714.4072080-1-alan.maguire@oracle.com/
[3] https://lore.kernel.org/bpf/20240618162449.809994-1-alan.maguire@oracle.com/
====================

Link: https://lore.kernel.org/r/20240620091733.1967885-1-alan.maguire@oracle.com
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

show more ...

libbpf: Split field iter code into its own file kernel

This will allow it to be shared with the kernel. No functional change.

Suggested-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alan

libbpf: Split field iter code into its own file kernel

This will allow it to be shared with the kernel. No functional change.

Suggested-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240620091733.1967885-4-alan.maguire@oracle.com

show more ...

Merge branch 'bpf-support-resilient-split-btf'

Alan Maguire says:

====================
bpf: support resilient split BTF

Split BPF Type Format (BTF) provides huge advantages in that kernel
modules

Merge branch 'bpf-support-resilient-split-btf'

Alan Maguire says:

====================
bpf: support resilient split BTF

Split BPF Type Format (BTF) provides huge advantages in that kernel
modules only have to provide type information for types that they do not
share with the core kernel; for core kernel types, split BTF refers to
core kernel BTF type ids. So for a STRUCT sk_buff, a module that
uses that structure (or a pointer to it) simply needs to refer to the
core kernel type id, saving the need to define the structure and its many
dependents. This cuts down on duplication and makes BTF as compact
as possible.

However, there is a downside. This scheme requires the references from
split BTF to base BTF to be valid not just at encoding time, but at use
time (when the module is loaded). Even a small change in kernel types
can perturb the type ids in core kernel BTF, and - if the new reproducible
BTF option is not used - pahole's parallel processing of compilation units
can lead to different type ids for the same kernel if the BTF is
regenerated.

So we have a robustness problem for split BTF for cases where a module is
not always compiled at the same time as the kernel. This problem is
particularly acute for distros which generally want module builders to be
able to compile a module for the lifetime of a Linux stable-based release,
and have it continue to be valid over the lifetime of that release, even
as changes in data structures (and hence BTF types) accrue. Today it's not
possible to generate BTF for modules that works beyond the initial
kernel it is compiled against - kernel bugfixes etc invalidate the split
BTF references to vmlinux BTF, and BTF is no longer usable for the
module.

The goal of this series is to provide options to provide additional
context for cases like this. That context comes in the form of
distilled base BTF; it stands in for the base BTF, and contains
information about the types referenced from split BTF, but not their
full descriptions. The modified split BTF will refer to type ids in
this .BTF.base section, and when the kernel loads such modules it
will use that .BTF.base to map references from split BTF to the
equivalent current vmlinux base BTF types. Once this relocation
process has succeeded, the module BTF available in /sys/kernel/btf
will look exactly as if it was built with the current vmlinux;
references to base types will be fixed up etc.

A module builder - using this series along with the pahole changes -
can then build a module with distilled base BTF via an out-of-tree
module build, i.e.

make -C . M=path/2/module

The module will have a .BTF section (the split BTF) and a
.BTF.base section. The latter is small in size - distilled base
BTF does not need full struct/union/enum information for named
types for example. For 2667 modules built with distilled base BTF,
the average size observed was 1556 bytes (stddev 1563). The overall
size added to this 2667 modules was 5.3Mb.

Note that for the in-tree modules, this approach is not needed as
split and base BTF in the case of in-tree modules are always built
and re-built together.

The series first focuses on generating split BTF with distilled base
BTF; then relocation support is added to allow split BTF with
an associated distlled base to be relocated with a new base BTF.

Next Eduard's patch allows BTF ELF parsing to work with both
.BTF and .BTF.base sections; this ensures that bpftool will be
able to dump BTF for a module with a .BTF.base section for example,
or indeed dump relocated BTF where a module and a "-B vmlinux"
is supplied.

Then we add support to resolve_btfids to ignore base BTF - i.e.
to avoid relocation - if a .BTF.base section is found. This ensures
the .BTF.ids section is populated with ids relative to the distilled
base (these will be relocated as part of module load).

Finally the series supports storage of .BTF.base data/size in modules
and supports sharing of relocation code with the kernel to allow
relocation of module BTF. For the kernel, this relocation
process happens at module load time, and we relocate split BTF
references to point at types in the current vmlinux BTF. As part of
this, .BTF.ids references need to be mapped also.

So concretely, what happens is

- we generate split BTF in the .BTF section of a module that refers to
types in the .BTF.base section as base types; the latter are not full
type descriptions but provide information about the base type. So
a STRUCT sk_buff would be represented as a FWD struct sk_buff in
distilled base BTF for example.
- when the module is loaded, the split BTF is relocated with vmlinux
BTF; in the case of the FWD struct sk_buff, we find the STRUCT sk_buff
in vmlinux BTF and map all split BTF references to the distilled base
FWD sk_buff, replacing them with references to the vmlinux BTF
STRUCT sk_buff.

A previous approach to this problem [1] utilized standalone BTF for such
cases - where the BTF is not defined relative to base BTF so there is no
relocation required. The problem with that approach is that from
the verifier perspective, some types are special, and having a custom
representation of a core kernel type that did not necessarily match the
current representation is not tenable. So the approach taken here was
to preserve the split BTF model while minimizing the representation of
the context needed to relocate split and current vmlinux BTF.

To generate distilled .BTF.base sections the associated dwarves
patch (to be applied on the "next" branch there) is needed [3]
Without it, things will still work but modules will not be built
with a .BTF.base section.

Changes since v5[4]:

- Update search of distilled types to return the first occurrence
of a string (or a string+size pair); this allows us to iterate
over all matches in distilled base BTF (Andrii, patch 3)
- Update to use BTF field iterators (Andrii, patches 1, 3 and 8)
- Update tests to cover multiple match and associated error cases
(Eduard, patch 4)
- Rename elf_sections_info to btf_elf_secs, remove use of
libbpf_get_error(), reset btf->owns_base when relocation
succeeds (Andrii, patch 5)

Changes since v4[5]:

- Moved embeddedness, duplicate name checks to relocation time
and record struct/union size for all distilled struct/unions
instead of using forwards. This allows us to carry out
type compatibility checks based on the base BTF we want to
relocate with (Eduard, patches 1, 3)
- Moved to using qsort() instead of qsort_r() as support for
qsort_r() appears to be missing in Android libc (Andrii, patch 3)
- Sorting/searching now incorporates size matching depending
on BTF kind and embeddedness of struct/union (Eduard, Andrii,
patch 3)
- Improved naming of various types during relocation to avoid
confusion (Andrii, patch 3)
- Incorporated Eduard's patch (patch 5) which handles .BTF.base
sections internally in btf_parse_elf(). This makes ELF parsing
work with split BTF, split BTF with a distilled base, split
BTF with a distilled base _and_ base BTF (by relocating) etc.
Having this avoids the need for bpftool changes; it will work
as-is with .BTF.base sections (Eduard, patch 4)
- Updated resolve_btfids to _not_ relocate BTF for modules
where a .BTF.base section is present; in that one case we
do not want to relocate BTF as the .BTF.ids section should
reflect ids in .BTF.base which will later be relocated on
module load (Eduard, Andrii, patch 5)

Changes since v3[6]:

- distill now checks for duplicate-named struct/unions and records
them as a sized struct/union to help identify which of the
multiple base BTF structs/unions it refers to (Eduard, patch 1)
- added test support for multiple name handling (Eduard, patch 2)
- simplified the string mapping when updating split BTF to use
base BTF instead of distilled base. Since the only string
references split BTF can make to base BTF are the names of
the base types, create a string map from distilled string
offset -> base BTF string offset and update string offsets
by visiting all strings in split BTF; this saves having to
do costly searches of base BTF (Eduard, patch 7,10)
- fixed bpftool manpage and indentation issues (Quentin, patch 11)

Also explored Eduard's suggestion of doing an implicit fallback
to checking for .BTF.base section in btf__parse() when it is
called to get base BTF. However while it is doable, it turned
out to be difficult operationally. Since fallback is implicit
we do not know the source of the BTF - was it from .BTF or
.BTF.base? In bpftool, we want to try first standalone BTF,
then split, then split with distilled base. Having a way
to explicitly request .BTF.base via btf__parse_opts() fits
that model better.

Changes since v2[7]:

- submitted patch to use --btf_features in Makefile.btf for pahole
v1.26 and later separately (Andrii). That has landed in bpf-next
now.
- distilled base now encodes ENUM64 as fwd ENUM (size 8), eliminating
the need for support for ENUM64 in btf__add_fwd (patch 1, Andrii)
- moved to distilling only named types, augmenting split BTF with
associated reference types; this simplifies greatly the distilled
base BTF and the mapping operation between distilled and base
BTF when relocating (most of the series changes, Andrii)
- relocation now iterates over base BTF, looking for matches based
on name in distilled BTF. Distilled BTF is pre-sorted by name
(Andrii, patch 8)
- removed most redundant compabitiliby checks aside from struct
size for base types/embedded structs and kind compatibility
(since we only match on name) (Andrii, patch 8)
- btf__parse_opts() now replaces btf_parse() internally in libbpf
(Eduard, patch 3)

Changes since RFC [8]:

- updated terminology; we replace clunky "base reference" BTF with
distilling base BTF into a .BTF.base section. Similarly BTF
reconcilation becomes BTF relocation (Andrii, most patches)
- add distilled base BTF by default for out-of-tree modules
(Alexei, patch 8)
- distill algorithm updated to record size of embedded struct/union
by recording it as a 0-vlen STRUCT/UNION with size preserved
(Andrii, patch 2)
- verify size match on relocation for such STRUCT/UNIONs (Andrii,
patch 9)
- with embedded STRUCT/UNION recording size, we can have bpftool
dump a header representation using .BTF.base + .BTF sections
rather than special-casing and refusing to use "format c" for
that case (patch 5)
- match enum with enum64 and vice versa (Andrii, patch 9)
- ensure that resolve_btfids works with BTF without .BTF.base
section (patch 7)
- update tests to cover embedded types, arrays and function
prototypes (patches 3, 12)

[1] https://lore.kernel.org/bpf/20231112124834.388735-14-alan.maguire@oracle.com/
[2] https://lore.kernel.org/bpf/20240501175035.2476830-1-alan.maguire@oracle.com/
[3] https://lore.kernel.org/bpf/20240517102714.4072080-1-alan.maguire@oracle.com/
[4] https://lore.kernel.org/bpf/20240528122408.3154936-1-alan.maguire@oracle.com/
[5] https://lore.kernel.org/bpf/20240517102246.4070184-1-alan.maguire@oracle.com/
[6] https://lore.kernel.org/bpf/20240510103052.850012-1-alan.maguire@oracle.com/
[7] https://lore.kernel.org/bpf/20240424154806.3417662-1-alan.maguire@oracle.com/
[8] https://lore.kernel.org/bpf/20240322102455.98558-1-alan.maguire@oracle.com/
====================

Link: https://lore.kernel.org/r/20240613095014.357981-1-alan.maguire@oracle.com
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

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libbpf: Split BTF relocation

Map distilled base BTF type ids referenced in split BTF and their
references to the base BTF passed in, and if the mapping succeeds,
reparent the split BTF to the base B

libbpf: Split BTF relocation

Map distilled base BTF type ids referenced in split BTF and their
references to the base BTF passed in, and if the mapping succeeds,
reparent the split BTF to the base BTF.

Relocation is done by first verifying that distilled base BTF
only consists of named INT, FLOAT, ENUM, FWD, STRUCT and
UNION kinds; then we sort these to speed lookups. Once sorted,
the base BTF is iterated, and for each relevant kind we check
for an equivalent in distilled base BTF. When found, the
mapping from distilled -> base BTF id and string offset is recorded.
In establishing mappings, we need to ensure we check STRUCT/UNION
size when the STRUCT/UNION is embedded in a split BTF STRUCT/UNION,
and when duplicate names exist for the same STRUCT/UNION. Otherwise
size is ignored in matching STRUCT/UNIONs.

Once all mappings are established, we can update type ids
and string offsets in split BTF and reparent it to the new base.

Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/bpf/20240613095014.357981-4-alan.maguire@oracle.com

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Merge topic branches 'clkdev' and 'fixes' into for-linus

Merge branch 'master' into mm-stable

Merge drm/drm-next into drm-xe-next

Backmerging drm-next in order to get up-to-date and in particular
to access commit 9ca5facd0400f610f3f7f71aeb7fc0b949a48c67.

Signed-off-by: Thomas Hellström <tho

Merge drm/drm-next into drm-xe-next

Backmerging drm-next in order to get up-to-date and in particular
to access commit 9ca5facd0400f610f3f7f71aeb7fc0b949a48c67.

Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>

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Merge tag 'phy_dp_modes_6.10' into msm-next-lumag

Merge DisplayPort subnode API in order to allow DisplayPort driver to
configure the PHYs either to the DP or eDP mode, depending on hardware
configu

Merge tag 'phy_dp_modes_6.10' into msm-next-lumag

Merge DisplayPort subnode API in order to allow DisplayPort driver to
configure the PHYs either to the DP or eDP mode, depending on hardware
configuration.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

show more ...

Merge drm/drm-next into drm-intel-next

Catching up on 6.9-rc2

Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>