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NTB: add new parameter to peer_db_addr() db_bit and db_data

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NTB door bell usage depends on NTB hardware.

ex: intel NTB gen1 has one peer door bell register which can be controlled
by the bitmap writen to it, while Intel NTB gen3 has a registers
per door bell and the data trigering the each door bell is always 1.

therefore exposing only peer door bell address forcing the user
to be aware of such low level details

Signed-off-by: Leonid Ravich <Leonid.Ravich@emc.com>
Acked-by: Logan Gunthorpe <logang@deltatee.com>
Acked-by: Dave Jiang <dave.jiang@intel.com>
Acked-by: Allen Hubbe <allenbh@gmail.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
This commit is contained in:
Leonid Ravich
2019-02-12 22:09:28 +02:00
committed by Jon Mason
parent c59666bb32
commit ebb09b33c6
5 changed files with 69 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
include/linux/ntb.h
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@@ -296,7 +296,8 @@ struct ntb_dev_ops {
int (*db_clear_mask)(struct ntb_dev *ntb, u64 db_bits);
int (*peer_db_addr)(struct ntb_dev *ntb,
phys_addr_t *db_addr, resource_size_t *db_size);
phys_addr_t *db_addr, resource_size_t *db_size,
u64 *db_data, int db_bit);
u64 (*peer_db_read)(struct ntb_dev *ntb);
int (*peer_db_set)(struct ntb_dev *ntb, u64 db_bits);
int (*peer_db_clear)(struct ntb_dev *ntb, u64 db_bits);
@@ -1078,6 +1079,8 @@ static inline int ntb_db_clear_mask(struct ntb_dev *ntb, u64 db_bits)
* @ntb: NTB device context.
* @db_addr: OUT - The address of the peer doorbell register.
* @db_size: OUT - The number of bytes to write the peer doorbell register.
* @db_data: OUT - The data of peer doorbell register
* @db_bit: door bell bit number
*
* Return the address of the peer doorbell register. This may be used, for
* example, by drivers that offload memory copy operations to a dma engine.
@@ -1091,12 +1094,13 @@ static inline int ntb_db_clear_mask(struct ntb_dev *ntb, u64 db_bits)
*/
static inline int ntb_peer_db_addr(struct ntb_dev *ntb,
phys_addr_t *db_addr,
resource_size_t *db_size)
resource_size_t *db_size,
u64 *db_data, int db_bit)
{
if (!ntb->ops->peer_db_addr)
return -EINVAL;
return ntb->ops->peer_db_addr(ntb, db_addr, db_size);
return ntb->ops->peer_db_addr(ntb, db_addr, db_size, db_data, db_bit);
}
/**