| Message ID | 20220318161528.1531164-14-benjamin.tissoires@redhat.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Introduce eBPF support for HID devices | expand |
On Fri, Mar 18, 2022 at 9:18 AM Benjamin Tissoires <benjamin.tissoires@redhat.com> wrote: > > Export implement() outside of hid-core.c and use this and Maybe rename implement() to something that makes sense? > hid_field_extract() to implement the helprs for hid-bpf. > > Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> > > --- > > changes in v3: > - renamed hid_{get|set}_data into hid_{get|set}_bits > > changes in v2: > - split the series by bpf/libbpf/hid/selftests and samples > - allow for n > 32, by relying on memcpy > --- > drivers/hid/hid-bpf.c | 29 +++++++++++++++++++++++++++++ > drivers/hid/hid-core.c | 4 ++-- > include/linux/hid.h | 2 ++ > 3 files changed, 33 insertions(+), 2 deletions(-) > > diff --git a/drivers/hid/hid-bpf.c b/drivers/hid/hid-bpf.c > index 45c87ff47324..650dd5e54919 100644 > --- a/drivers/hid/hid-bpf.c > +++ b/drivers/hid/hid-bpf.c > @@ -122,6 +122,33 @@ static void hid_bpf_array_detach(struct hid_device *hdev, enum bpf_hid_attach_ty > } > } > > +static int hid_bpf_get_bits(struct hid_device *hdev, u8 *buf, size_t buf_size, u64 offset, u32 n, > + u32 *data) > +{ > + if (n > 32) > + return -EINVAL; > + > + if (((offset + n) >> 3) >= buf_size) > + return -E2BIG; > + > + *data = hid_field_extract(hdev, buf, offset, n); > + return n; > +} > + > +static int hid_bpf_set_bits(struct hid_device *hdev, u8 *buf, size_t buf_size, u64 offset, u32 n, > + u32 data) > +{ > + if (n > 32) > + return -EINVAL; > + > + if (((offset + n) >> 3) >= buf_size) > + return -E2BIG; > + > + /* data must be a pointer to a u32 */ > + implement(hdev, buf, offset, n, data); > + return n; > +} > + > static int hid_bpf_run_progs(struct hid_device *hdev, struct hid_bpf_ctx_kern *ctx) > { > enum bpf_hid_attach_type type; > @@ -223,6 +250,8 @@ int __init hid_bpf_module_init(void) > .pre_link_attach = hid_bpf_pre_link_attach, > .post_link_attach = hid_bpf_post_link_attach, > .array_detach = hid_bpf_array_detach, > + .hid_get_bits = hid_bpf_get_bits, > + .hid_set_bits = hid_bpf_set_bits, > }; > > bpf_hid_set_hooks(&hooks); > diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c > index 3182c39db006..4f669dcddc08 100644 > --- a/drivers/hid/hid-core.c > +++ b/drivers/hid/hid-core.c > @@ -1416,8 +1416,8 @@ static void __implement(u8 *report, unsigned offset, int n, u32 value) > } > } > > -static void implement(const struct hid_device *hid, u8 *report, > - unsigned offset, unsigned n, u32 value) > +void implement(const struct hid_device *hid, u8 *report, unsigned int offset, unsigned int n, > + u32 value) > { > if (unlikely(n > 32)) { > hid_warn(hid, "%s() called with n (%d) > 32! (%s)\n", > diff --git a/include/linux/hid.h b/include/linux/hid.h > index 66d949d10b78..7454e844324c 100644 > --- a/include/linux/hid.h > +++ b/include/linux/hid.h > @@ -944,6 +944,8 @@ bool hid_compare_device_paths(struct hid_device *hdev_a, > s32 hid_snto32(__u32 value, unsigned n); > __u32 hid_field_extract(const struct hid_device *hid, __u8 *report, > unsigned offset, unsigned n); > +void implement(const struct hid_device *hid, u8 *report, unsigned int offset, unsigned int n, > + u32 value); > > #ifdef CONFIG_PM > int hid_driver_suspend(struct hid_device *hdev, pm_message_t state); > -- > 2.35.1 >
diff --git a/drivers/hid/hid-bpf.c b/drivers/hid/hid-bpf.c index 45c87ff47324..650dd5e54919 100644 --- a/drivers/hid/hid-bpf.c +++ b/drivers/hid/hid-bpf.c @@ -122,6 +122,33 @@ static void hid_bpf_array_detach(struct hid_device *hdev, enum bpf_hid_attach_ty } } +static int hid_bpf_get_bits(struct hid_device *hdev, u8 *buf, size_t buf_size, u64 offset, u32 n, + u32 *data) +{ + if (n > 32) + return -EINVAL; + + if (((offset + n) >> 3) >= buf_size) + return -E2BIG; + + *data = hid_field_extract(hdev, buf, offset, n); + return n; +} + +static int hid_bpf_set_bits(struct hid_device *hdev, u8 *buf, size_t buf_size, u64 offset, u32 n, + u32 data) +{ + if (n > 32) + return -EINVAL; + + if (((offset + n) >> 3) >= buf_size) + return -E2BIG; + + /* data must be a pointer to a u32 */ + implement(hdev, buf, offset, n, data); + return n; +} + static int hid_bpf_run_progs(struct hid_device *hdev, struct hid_bpf_ctx_kern *ctx) { enum bpf_hid_attach_type type; @@ -223,6 +250,8 @@ int __init hid_bpf_module_init(void) .pre_link_attach = hid_bpf_pre_link_attach, .post_link_attach = hid_bpf_post_link_attach, .array_detach = hid_bpf_array_detach, + .hid_get_bits = hid_bpf_get_bits, + .hid_set_bits = hid_bpf_set_bits, }; bpf_hid_set_hooks(&hooks); diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index 3182c39db006..4f669dcddc08 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -1416,8 +1416,8 @@ static void __implement(u8 *report, unsigned offset, int n, u32 value) } } -static void implement(const struct hid_device *hid, u8 *report, - unsigned offset, unsigned n, u32 value) +void implement(const struct hid_device *hid, u8 *report, unsigned int offset, unsigned int n, + u32 value) { if (unlikely(n > 32)) { hid_warn(hid, "%s() called with n (%d) > 32! (%s)\n", diff --git a/include/linux/hid.h b/include/linux/hid.h index 66d949d10b78..7454e844324c 100644 --- a/include/linux/hid.h +++ b/include/linux/hid.h @@ -944,6 +944,8 @@ bool hid_compare_device_paths(struct hid_device *hdev_a, s32 hid_snto32(__u32 value, unsigned n); __u32 hid_field_extract(const struct hid_device *hid, __u8 *report, unsigned offset, unsigned n); +void implement(const struct hid_device *hid, u8 *report, unsigned int offset, unsigned int n, + u32 value); #ifdef CONFIG_PM int hid_driver_suspend(struct hid_device *hdev, pm_message_t state);
Export implement() outside of hid-core.c and use this and hid_field_extract() to implement the helprs for hid-bpf. Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> --- changes in v3: - renamed hid_{get|set}_data into hid_{get|set}_bits changes in v2: - split the series by bpf/libbpf/hid/selftests and samples - allow for n > 32, by relying on memcpy --- drivers/hid/hid-bpf.c | 29 +++++++++++++++++++++++++++++ drivers/hid/hid-core.c | 4 ++-- include/linux/hid.h | 2 ++ 3 files changed, 33 insertions(+), 2 deletions(-)