kernel/linux.git/include/linux/pds, branch v7.3-rc1

pds_core: add host backed memory support for firmware

2026-08-06T00:59:29+00:00

Some newer AMD/Pensando cards have minimal memory and there are cases where components, specifically in the control plane, need more memory. This series adds support for host backed DMA memory that can be used by the firmware for the previously mentioned cases. Host memory allocation is best-effort: if some allocations fail, the driver continues with whatever succeeded. Firmware gracefully degrades when less memory is available than requested. Signed-off-by: Vamsi Atluri Signed-off-by: Nikhil P. Rao Link: https://patch.msgid.link/20260730-upstream_v8-v12-5-136cd174ee85@amd.com Signed-off-by: Jakub Kicinski

pds_core: add PLDM firmware update support via devlink flash

2026-08-06T00:59:29+00:00

Implement PLDM FW Update in the pds_core driver using the upstream pldmfw API. This allows updating an entire PLDM FW package at once or updating specific firmware components by name. Flash the entire image: devlink dev flash pci/0000:b5:00.0 file firmware.pldmfw Flash a specific component from the PLDM FW package: devlink dev flash pci/0000:b5:00.0 \ file firmware.pldmfw component fw.cpld Per-component update uses driver-defined component names (fw, fw.cpld, etc.). Not all components support per-component update - devlink will reject the request if the specified component cannot be updated. Signed-off-by: Brett Creeley Signed-off-by: Nikhil P. Rao Link: https://patch.msgid.link/20260730-upstream_v8-v12-3-136cd174ee85@amd.com Signed-off-by: Jakub Kicinski

pds_core: add support for identity version 2

2026-08-06T00:59:29+00:00

Add a new capabilities field in struct pds_core_dev_identity, which requires bumping the identity version to 2, i.e. PDS_CORE_IDENTITY_VERSION_2. If version 2 negotiation fails, then quietly fall back to version 1. If version 1 negotiation fails, then driver load will fail. Another patch in the series will make use of the capabilities field. Signed-off-by: Brett Creeley Link: https://patch.msgid.link/20260730-upstream_v8-v12-2-136cd174ee85@amd.com Signed-off-by: Jakub Kicinski

pds_core: smaller adminq poll starting interval

2025-04-30T11:55:59+00:00

Shorten the adminq poll starting interval in order to notice any transaction errors more quickly. Signed-off-by: Shannon Nelson Reviewed-by: Simon Horman Signed-off-by: David S. Miller

pds_core: remove extra name description

2025-04-30T11:55:59+00:00

Fix the kernel-doc complaint include/linux/pds/pds_adminq.h:481: warning: Excess struct member 'name' description in 'pds_core_lif_getattr_comp' Reviewed-by: Simon Horman Signed-off-by: Shannon Nelson Signed-off-by: David S. Miller

pds_fwctl: add rpc and query support

2025-03-21T23:57:55+00:00

The pds_fwctl driver doesn't know what RPC operations are available in the firmware, so also doesn't know what scope they might have. The userland utility supplies the firmware "endpoint" and "operation" id values and this driver queries the firmware for endpoints and their available operations. The operation descriptions include the scope information which the driver uses for scope testing. Link: https://patch.msgid.link/r/20250320194412.67983-6-shannon.nelson@amd.com Reviewed-by: Leon Romanovsky Signed-off-by: Brett Creeley Reviewed-by: Jonathan Cameron Signed-off-by: Shannon Nelson Signed-off-by: Jason Gunthorpe

pds_fwctl: initial driver framework

2025-03-21T23:57:55+00:00

Initial files for adding a new fwctl driver for the AMD/Pensando PDS devices. This sets up a simple auxiliary_bus driver that registers with fwctl subsystem. It expects that a pds_core device has set up the auxiliary_device pds_core.fwctl Link: https://patch.msgid.link/r/20250320194412.67983-5-shannon.nelson@amd.com Reviewed-by: Leon Romanovsky Reviewed-by: Dave Jiang Reviewed-by: Jonathan Cameron Signed-off-by: Shannon Nelson Signed-off-by: Jason Gunthorpe

pds_core: add new fwctl auxiliary_device

2025-03-20T23:03:29+00:00

Add support for a new fwctl-based auxiliary_device for creating a channel for fwctl support into the AMD/Pensando DSC. Link: https://patch.msgid.link/r/20250320194412.67983-4-shannon.nelson@amd.com Reviewed-by: Leon Romanovsky Reviewed-by: Dave Jiang Reviewed-by: Jonathan Cameron Signed-off-by: Shannon Nelson Signed-off-by: Jason Gunthorpe

fix missing vmalloc.h includes

2024-04-26T03:55:49+00:00

Patch series "Memory allocation profiling", v6. Overview: Low overhead [1] per-callsite memory allocation profiling. Not just for debug kernels, overhead low enough to be deployed in production. Example output: root@moria-kvm:~# sort -rn /proc/allocinfo 127664128 31168 mm/page_ext.c:270 func:alloc_page_ext 56373248 4737 mm/slub.c:2259 func:alloc_slab_page 14880768 3633 mm/readahead.c:247 func:page_cache_ra_unbounded 14417920 3520 mm/mm_init.c:2530 func:alloc_large_system_hash 13377536 234 block/blk-mq.c:3421 func:blk_mq_alloc_rqs 11718656 2861 mm/filemap.c:1919 func:__filemap_get_folio 9192960 2800 kernel/fork.c:307 func:alloc_thread_stack_node 4206592 4 net/netfilter/nf_conntrack_core.c:2567 func:nf_ct_alloc_hashtable 4136960 1010 drivers/staging/ctagmod/ctagmod.c:20 [ctagmod] func:ctagmod_start 3940352 962 mm/memory.c:4214 func:alloc_anon_folio 2894464 22613 fs/kernfs/dir.c:615 func:__kernfs_new_node ... Usage: kconfig options: - CONFIG_MEM_ALLOC_PROFILING - CONFIG_MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT - CONFIG_MEM_ALLOC_PROFILING_DEBUG adds warnings for allocations that weren't accounted because of a missing annotation sysctl: /proc/sys/vm/mem_profiling Runtime info: /proc/allocinfo Notes: [1]: Overhead To measure the overhead we are comparing the following configurations: (1) Baseline with CONFIG_MEMCG_KMEM=n (2) Disabled by default (CONFIG_MEM_ALLOC_PROFILING=y && CONFIG_MEM_ALLOC_PROFILING_BY_DEFAULT=n) (3) Enabled by default (CONFIG_MEM_ALLOC_PROFILING=y && CONFIG_MEM_ALLOC_PROFILING_BY_DEFAULT=y) (4) Enabled at runtime (CONFIG_MEM_ALLOC_PROFILING=y && CONFIG_MEM_ALLOC_PROFILING_BY_DEFAULT=n && /proc/sys/vm/mem_profiling=1) (5) Baseline with CONFIG_MEMCG_KMEM=y && allocating with __GFP_ACCOUNT (6) Disabled by default (CONFIG_MEM_ALLOC_PROFILING=y && CONFIG_MEM_ALLOC_PROFILING_BY_DEFAULT=n) && CONFIG_MEMCG_KMEM=y (7) Enabled by default (CONFIG_MEM_ALLOC_PROFILING=y && CONFIG_MEM_ALLOC_PROFILING_BY_DEFAULT=y) && CONFIG_MEMCG_KMEM=y Performance overhead: To evaluate performance we implemented an in-kernel test executing multiple get_free_page/free_page and kmalloc/kfree calls with allocation sizes growing from 8 to 240 bytes with CPU frequency set to max and CPU affinity set to a specific CPU to minimize the noise. Below are results from running the test on Ubuntu 22.04.2 LTS with 6.8.0-rc1 kernel on 56 core Intel Xeon: kmalloc pgalloc (1 baseline) 6.764s 16.902s (2 default disabled) 6.793s (+0.43%) 17.007s (+0.62%) (3 default enabled) 7.197s (+6.40%) 23.666s (+40.02%) (4 runtime enabled) 7.405s (+9.48%) 23.901s (+41.41%) (5 memcg) 13.388s (+97.94%) 48.460s (+186.71%) (6 def disabled+memcg) 13.332s (+97.10%) 48.105s (+184.61%) (7 def enabled+memcg) 13.446s (+98.78%) 54.963s (+225.18%) Memory overhead: Kernel size: text data bss dec diff (1) 26515311 18890222 17018880 62424413 (2) 26524728 19423818 16740352 62688898 264485 (3) 26524724 19423818 16740352 62688894 264481 (4) 26524728 19423818 16740352 62688898 264485 (5) 26541782 18964374 16957440 62463596 39183 Memory consumption on a 56 core Intel CPU with 125GB of memory: Code tags: 192 kB PageExts: 262144 kB (256MB) SlabExts: 9876 kB (9.6MB) PcpuExts: 512 kB (0.5MB) Total overhead is 0.2% of total memory. Benchmarks: Hackbench tests run 100 times: hackbench -s 512 -l 200 -g 15 -f 25 -P baseline disabled profiling enabled profiling avg 0.3543 0.3559 (+0.0016) 0.3566 (+0.0023) stdev 0.0137 0.0188 0.0077 hackbench -l 10000 baseline disabled profiling enabled profiling avg 6.4218 6.4306 (+0.0088) 6.5077 (+0.0859) stdev 0.0933 0.0286 0.0489 stress-ng tests: stress-ng --class memory --seq 4 -t 60 stress-ng --class cpu --seq 4 -t 60 Results posted at: https://evilpiepirate.org/~kent/memalloc_prof_v4_stress-ng/ [2] https://lore.kernel.org/all/20240306182440.2003814-1-surenb@google.com/ This patch (of 37): The next patch drops vmalloc.h from a system header in order to fix a circular dependency; this adds it to all the files that were pulling it in implicitly. [kent.overstreet@linux.dev: fix arch/alpha/lib/memcpy.c] Link: https://lkml.kernel.org/r/20240327002152.3339937-1-kent.overstreet@linux.dev [surenb@google.com: fix arch/x86/mm/numa_32.c] Link: https://lkml.kernel.org/r/20240402180933.1663992-1-surenb@google.com [kent.overstreet@linux.dev: a few places were depending on sizes.h] Link: https://lkml.kernel.org/r/20240404034744.1664840-1-kent.overstreet@linux.dev [arnd@arndb.de: fix mm/kasan/hw_tags.c] Link: https://lkml.kernel.org/r/20240404124435.3121534-1-arnd@kernel.org [surenb@google.com: fix arc build] Link: https://lkml.kernel.org/r/20240405225115.431056-1-surenb@google.com Link: https://lkml.kernel.org/r/20240321163705.3067592-1-surenb@google.com Link: https://lkml.kernel.org/r/20240321163705.3067592-2-surenb@google.com Signed-off-by: Kent Overstreet Signed-off-by: Suren Baghdasaryan Signed-off-by: Arnd Bergmann Reviewed-by: Pasha Tatashin Tested-by: Kees Cook Cc: Alexander Viro Cc: Alex Gaynor Cc: Alice Ryhl Cc: Andreas Hindborg Cc: Benno Lossin Cc: "Björn Roy Baron" Cc: Boqun Feng Cc: Christoph Lameter Cc: Dennis Zhou Cc: Gary Guo Cc: Miguel Ojeda Cc: Peter Zijlstra Cc: Tejun Heo Cc: Vlastimil Babka Cc: Wedson Almeida Filho Signed-off-by: Andrew Morton

pds_core: check health in devcmd wait

2023-09-18T08:28:22+00:00

Similar to what we do in the AdminQ, check for devcmd health while waiting for an answer. Signed-off-by: Shannon Nelson Reviewed-by: Brett Creeley Signed-off-by: David S. Miller