[PATCH bpf-next v3 13/17] HID: bpf: implement hid_bpf_get|set_bits
From: Benjamin Tissoires <hidden>
Date: 2022-03-18 16:19:53
Also in:
bpf, linux-doc, linux-kselftest, lkml, netdev
Subsystem:
hid core layer, the rest · Maintainers:
Jiri Kosina, Benjamin Tissoires, Linus Torvalds
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 <redacted>
---
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