Changes in Makefile

4a86220e - HID: bpf: remove tracing HID-BPF capability

Sat, 08 Jun 2024 09:01:20 +0000

HID: bpf: remove tracing HID-BPF capabilityWe can now rely on struct_ops as we cleared the users in-tree.Link: https://lore.kernel.org/r/20240608-hid_bpf_struct_ops-v3-8-6ac6ade58329@kernel.orgSigned-off-by: Benjamin Tissoires List of files: /linux-6.15/drivers/hid/bpf/Makefile

ebc0d809 - HID: bpf: implement HID-BPF through bpf_struct_ops

Sat, 08 Jun 2024 09:01:15 +0000

HID: bpf: implement HID-BPF through bpf_struct_opsWe do this implementation in several steps to not have the CI failing:- first (this patch), we add struct_ops while keeping the existing infra available- then we change the selftests, the examples and the existing in-tree HID-BPF programs- then we remove the existing trace points making old HID-BPF obsoleteThere are a few advantages of struct_ops over tracing:- compatibility with sleepable programs (for hid_hw_raw_request() in a later patch)- a lot simpler in the kernel: it's a simple rcu protected list- we can add more parameters to the function called without much trouble- the "attach" is now generic through BPF-core: the caller just needs to set hid_id and flags before calling __load().- all the BPF tough part is not handled in BPF-core through generic processing- hid_bpf_ctx is now only writable where it needs beAcked-by: Alexei Starovoitov Link: https://lore.kernel.org/r/20240608-hid_bpf_struct_ops-v3-3-6ac6ade58329@kernel.orgSigned-off-by: Benjamin Tissoires List of files: /linux-6.15/drivers/hid/bpf/Makefile

f5c27da4 - HID: initial BPF implementation

Thu, 03 Nov 2022 15:57:44 +0000

HID: initial BPF implementationDeclare an entry point that can use fmod_ret BPF programs, andalso an API to access and change the incoming data.A simpler implementation would consist in just callinghid_bpf_device_event() for any incoming event and let users dealwith the fact that they will be called for any event of any device.The goal of HID-BPF is to partially replace drivers, so this situationcan be problematic because we might have programs which will step oneach other toes.For that, we add a new API hid_bpf_attach_prog() that can be calledfrom a syscall and we manually deal with a jump table in hid-bpf.Whenever we add a program to the jump table (in other words, when weattach a program to a HID device), we keep the number of time we addedthis program in the jump table so we can release it whenever there areno other users.HID devices have an RCU protected list of available programs in thejump table, and those programs are called one after the other thanksto bpf_tail_call().To achieve the detection of users losing their fds on the programs weattached, we add 2 tracing facilities on bpf_prog_release() (for whena fd is closed) and bpf_free_inode() (for when a pinned program getsunpinned).Reviewed-by: Greg Kroah-Hartman Signed-off-by: Benjamin Tissoires Signed-off-by: Jiri Kosina List of files: /linux-6.15/drivers/hid/bpf/Makefile