[RFC PATCH v4 10/38] NTB: core: Add .get_private_data() to ntb_dev_ops
From: Koichiro Den <hidden>
Date: 2026-01-18 13:55:16
Also in:
dmaengine, linux-devicetree, linux-doc, linux-iommu, linux-kselftest, linux-pci, linux-renesas-soc, lkml
Subsystem:
ntb driver core, the rest · Maintainers:
Jon Mason, Dave Jiang, Allen Hubbe, Linus Torvalds
Add an optional get_private_data() callback to retrieve a private data specific to the underlying hardware driver, e.g. pci_epc device associated with the NTB implementation. Signed-off-by: Koichiro Den <redacted> --- include/linux/ntb.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)
diff --git a/include/linux/ntb.h b/include/linux/ntb.h
index 84908753f446..aa888219732a 100644
--- a/include/linux/ntb.h
+++ b/include/linux/ntb.h@@ -262,6 +262,7 @@ struct ntb_mw_subrange { * @msg_clear_mask: See ntb_msg_clear_mask(). * @msg_read: See ntb_msg_read(). * @peer_msg_write: See ntb_peer_msg_write(). + * @get_private_data: See ntb_get_private_data(). */ struct ntb_dev_ops { int (*port_number)(struct ntb_dev *ntb);
@@ -338,6 +339,7 @@ struct ntb_dev_ops { int (*msg_clear_mask)(struct ntb_dev *ntb, u64 mask_bits); u32 (*msg_read)(struct ntb_dev *ntb, int *pidx, int midx); int (*peer_msg_write)(struct ntb_dev *ntb, int pidx, int midx, u32 msg); + void *(*get_private_data)(struct ntb_dev *ntb); }; static inline int ntb_dev_ops_is_valid(const struct ntb_dev_ops *ops)
@@ -401,6 +403,9 @@ static inline int ntb_dev_ops_is_valid(const struct ntb_dev_ops *ops) /* !ops->msg_clear_mask == !ops->msg_count && */ !ops->msg_read == !ops->msg_count && !ops->peer_msg_write == !ops->msg_count && + + /* Miscellaneous optional callbacks */ + /* ops->get_private_data && */ 1; }
@@ -1609,6 +1614,21 @@ static inline int ntb_peer_msg_write(struct ntb_dev *ntb, int pidx, int midx, return ntb->ops->peer_msg_write(ntb, pidx, midx, msg); } +/** + * ntb_get_private_data() - get private data specific to the hardware driver + * @ntb: NTB device context. + * + * Retrieve private data specific to the hardware driver. + * + * Return: Pointer to the private data if available, or %NULL otherwise. + */ +static inline void *ntb_get_private_data(struct ntb_dev *ntb) +{ + if (!ntb->ops->get_private_data) + return NULL; + return ntb->ops->get_private_data(ntb); +} + /** * ntb_peer_resource_idx() - get a resource index for a given peer idx * @ntb: NTB device context.
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2.51.0