Commit 4e8c11b7 authored by Serge Semin's avatar Serge Semin Committed by Jon Mason
Browse files

NTB: Alter link-state API to support multi-port devices 



Multi-port devices permit the NTB connections between multiple domains,
so a local device can have NTB link being up with one peer and being
down with another. NTB link-state API is appropriately altered to return
a bitfield of the link-states between the local device and possible peers.

Signed-off-by: default avatarSerge Semin <fancer.lancer@gmail.com>
Acked-by: default avatarAllen Hubbe <Allen.Hubbe@dell.com>
Signed-off-by: default avatarJon Mason <jdmason@kudzu.us>
parent 1e530119

drivers/ntb/hw/amd/ntb_hw_amd.c

+1 −1
Original line number Diff line number Diff line
@@ -212,7 +212,7 @@ static int amd_link_is_up(struct amd_ntb_dev *ndev) 
	return 0;

}



static int amd_ntb_link_is_up(struct ntb_dev *ntb,

static u64 amd_ntb_link_is_up(struct ntb_dev *ntb,

			      enum ntb_speed *speed,

			      enum ntb_width *width)

{

drivers/ntb/hw/intel/ntb_hw_intel.c

+1 −1
Original line number Diff line number Diff line
@@ -1171,7 +1171,7 @@ static int intel_ntb_mw_set_trans(struct ntb_dev *ntb, int idx, 
	return 0;

}



static int intel_ntb_link_is_up(struct ntb_dev *ntb,

static u64 intel_ntb_link_is_up(struct ntb_dev *ntb,

				enum ntb_speed *speed,

				enum ntb_width *width)

{

include/linux/ntb.h

+16 −15
Original line number Diff line number Diff line
@@ -235,7 +235,7 @@ struct ntb_dev_ops { 
	int (*peer_port_number)(struct ntb_dev *ntb, int pidx);

	int (*peer_port_idx)(struct ntb_dev *ntb, int port);



	int (*link_is_up)(struct ntb_dev *ntb,

	u64 (*link_is_up)(struct ntb_dev *ntb,

			  enum ntb_speed *speed, enum ntb_width *width);

	int (*link_enable)(struct ntb_dev *ntb,

			   enum ntb_speed max_speed, enum ntb_width max_width);
@@ -607,25 +607,26 @@ static inline int ntb_peer_port_idx(struct ntb_dev *ntb, int port) 
 * state once after every link event.  It is safe to query the link state in

 * the context of the link event callback.

 *

 * Return: One if the link is up, zero if the link is down, otherwise a

 *		negative value indicating the error number.

 * Return: bitfield of indexed ports link state: bit is set/cleared if the

 *         link is up/down respectively.

 */

static inline int ntb_link_is_up(struct ntb_dev *ntb,

static inline u64 ntb_link_is_up(struct ntb_dev *ntb,

				 enum ntb_speed *speed, enum ntb_width *width)

{

	return ntb->ops->link_is_up(ntb, speed, width);

}



/**

 * ntb_link_enable() - enable the link on the secondary side of the ntb

 * ntb_link_enable() - enable the local port ntb connection

 * @ntb:	NTB device context.

 * @max_speed:	The maximum link speed expressed as PCIe generation number.

 * @max_width:	The maximum link width expressed as the number of PCIe lanes.

 *

 * Enable the link on the secondary side of the ntb.  This can only be done

 * from the primary side of the ntb in primary or b2b topology.  The ntb device

 * should train the link to its maximum speed and width, or the requested speed

 * and width, whichever is smaller, if supported.

 * Enable the NTB/PCIe link on the local or remote (for bridge-to-bridge

 * topology) side of the bridge. If it's supported the ntb device should train

 * the link to its maximum speed and width, or the requested speed and width,

 * whichever is smaller. Some hardware doesn't support PCIe link training, so

 * the last two arguments will be ignored then.

 *

 * Return: Zero on success, otherwise an error number.

 */
@@ -637,14 +638,14 @@ static inline int ntb_link_enable(struct ntb_dev *ntb, 
}



/**

 * ntb_link_disable() - disable the link on the secondary side of the ntb

 * ntb_link_disable() - disable the local port ntb connection

 * @ntb:	NTB device context.

 *

 * Disable the link on the secondary side of the ntb.  This can only be

 * done from the primary side of the ntb in primary or b2b topology.  The ntb

 * device should disable the link.  Returning from this call must indicate that

 * a barrier has passed, though with no more writes may pass in either

 * direction across the link, except if this call returns an error number.

 * Disable the link on the local or remote (for b2b topology) of the ntb.

 * The ntb device should disable the link.  Returning from this call must

 * indicate that a barrier has passed, though with no more writes may pass in

 * either direction across the link, except if this call returns an error

 * number.

 *

 * Return: Zero on success, otherwise an error number.

 */

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