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authorLeonid Ravich <lravich@gmail.com>2019-02-12 22:09:28 +0200
committerJon Mason <jdmason@kudzu.us>2019-02-13 11:03:18 -0500
commitebb09b33c60c46fd4f7ffa0af9e693eebe765d1b (patch)
treed41b706a6f27e5b4d9270cf3e62b6a4249037ab3 /include
parentc59666bb32b91da84b1d3df0e88789de9e827f61 (diff)
downloadlinux-0-day-ebb09b33c60c46fd4f7ffa0af9e693eebe765d1b.tar.gz
linux-0-day-ebb09b33c60c46fd4f7ffa0af9e693eebe765d1b.tar.xz
NTB: add new parameter to peer_db_addr() db_bit and db_data
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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/ntb.h10
1 files changed, 7 insertions, 3 deletions
diff --git a/include/linux/ntb.h b/include/linux/ntb.h
index 181d16601dd9c..56a92e3ae3ae5 100644
--- a/include/linux/ntb.h
+++ b/include/linux/ntb.h
@@ -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);
}
/**