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ftrace,bpf: Use single direct ops for bpf trampolines #6403

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@kernel-patches-daemon-bpf-rc kernel-patches-daemon-bpf-rc bot commented Nov 20, 2025

Pull request for series with
subject: ftrace,bpf: Use single direct ops for bpf trampolines
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1026027

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kernel-patches-daemon-bpf-rc bot commented Nov 20, 2025

Upstream branch: d088da9
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=1026027
version: 1

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Upstream branch: e0940c6
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=1026027
version: 1

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Upstream branch: 792f258
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=1026027
version: 1

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kernel-patches-daemon-bpf-rc bot commented Nov 22, 2025

Upstream branch: 878ee3c
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=1026027
version: 1

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Upstream branch: ae24fc8
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=1026027
version: 1

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Upstream branch: b7f7d76
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=1026027
version: 1

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Upstream branch: 4dd3a48
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=1026027
version: 1

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Upstream branch: 8f7cf30
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=1026027
version: 1

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Upstream branch: c427320
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=1026027
version: 1

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Upstream branch: 4617b30
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=1026027
version: 1

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kernel-patches-daemon-bpf-rc bot commented Nov 25, 2025

Upstream branch: 590699d
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=1026027
version: 1

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kernel-patches-daemon-bpf-rc bot commented Nov 25, 2025

Upstream branch: f2cb066
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=1026027
version: 1

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kernel-patches-daemon-bpf-rc bot commented Nov 25, 2025

Upstream branch: 8c868a3
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=1026027
version: 1

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kernel-patches-daemon-bpf-rc bot commented Nov 25, 2025

Upstream branch: 8f6ddc0
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=1026027
version: 1

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kernel-patches-daemon-bpf-rc bot commented Nov 25, 2025

Upstream branch: 5262cb2
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=1026027
version: 1

@olsajiri
ftrace: Make alloc_and_copy_ftrace_hash direct friendly
316d043 
Make alloc_and_copy_ftrace_hash to copy also direct address
for each hash entry.

Signed-off-by: Jiri Olsa <[email protected]>
@olsajiri
ftrace: Export some of hash related functions
1490df6 
We are going to use these functions in following changes.

Signed-off-by: Jiri Olsa <[email protected]>
@olsajiri
ftrace: Add update_ftrace_direct_add function
9a8a9b2 
Adding update_ftrace_direct_add function that adds all entries
(ip -> addr) provided in hash argument to direct ftrace ops
and updates its attachments.

The difference to current register_ftrace_direct is
 - hash argument that allows to register multiple ip -> direct
   entries at once
 - we can call update_ftrace_direct_add multiple times on the
   same ftrace_ops object, becase after first registration with
   register_ftrace_function_nolock, it uses ftrace_update_ops to
   update the ftrace_ops object

This change will allow us to have simple ftrace_ops for all bpf
direct interface users in following changes.

Signed-off-by: Jiri Olsa <[email protected]>
@olsajiri
ftrace: Add update_ftrace_direct_del function
dbb3de5 
Adding update_ftrace_direct_del function that removes all entries
(ip -> addr) provided in hash argument to direct ftrace ops and
updates its attachments.

The difference to current unregister_ftrace_direct is
 - hash argument that allows to unregister multiple ip -> direct
   entries at once
 - we can call update_ftrace_direct_del multiple times on the
   same ftrace_ops object, becase we do not need to unregister
   all entries at once, we can do it gradualy with the help of
   ftrace_update_ops function

This change will allow us to have simple ftrace_ops for all bpf
direct interface users in following changes.

Signed-off-by: Jiri Olsa <[email protected]>
@olsajiri
ftrace: Add update_ftrace_direct_mod function
5149b15 
Adding update_ftrace_direct_mod function that modifies all entries
(ip -> direct) provided in hash argument to direct ftrace ops and
updates its attachments.

The difference to current modify_ftrace_direct is:
- hash argument that allows to modify multiple ip -> direct
  entries at once

This change will allow us to have simple ftrace_ops for all bpf
direct interface users in following changes.

Signed-off-by: Jiri Olsa <[email protected]>
@olsajiri
bpf: Add trampoline ip hash table
5b36b5e 
Following changes need to lookup trampoline based on its ip address,
adding hash table for that.

Signed-off-by: Jiri Olsa <[email protected]>
@olsajiri
ftrace: Factor ftrace_ops ops_func interface
34256b9 
We are going to remove "ftrace_ops->private == bpf_trampoline" setup
in following changes.

Adding ip argument to ftrace_ops_func_t callback function, so we can
use it to look up the trampoline.

Signed-off-by: Jiri Olsa <[email protected]>
@olsajiri
bpf, x86: Use single ftrace_ops for direct calls
fecd0ab 
Using single ftrace_ops for direct calls update instead of allocating
ftrace_ops object for each trampoline.

With single ftrace_ops object we can use update_ftrace_direct_* api
that allows multiple ip sites updates on single ftrace_ops object.

Adding HAVE_SINGLE_FTRACE_DIRECT_OPS config option to be enabled on
each arch that supports this.

At the moment we can enable this only on x86 arch, because arm relies
on ftrace_ops object representing just single trampoline image (stored
in ftrace_ops::direct_call). Ach that do not support this will continue
to use *_ftrace_direct api.

Signed-off-by: Jiri Olsa <[email protected]>
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kernel-patches-daemon-bpf-rc bot commented Nov 26, 2025

Upstream branch: 688b745
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=1026027
version: 1

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@olsajiri