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Commit e5b0d2d1 authored by Xiangliang Yu's avatar Xiangliang Yu Committed by Jon Mason
Browse files

NTB: add support for hotplug feature 



AMD NTB support hotplug under B2B mode. NTB will trigger link
up/down interrupt event when doing plug add/remove, this patch
implements the two interrupt event to support B2B hotplug function.

Signed-off-by: default avatarXiangliang Yu <Xiangliang.Yu@amd.com>
Signed-off-by: default avatarShyam Sundar S K <Shyam-sundar.S-k@amd.com>
Acked-by: default avatarAllen Hubbe <Allen.Hubbe@dell.com>
Signed-off-by: default avatarJon Mason <jdmason@kudzu.us>
parent 783dfa6c

drivers/ntb/hw/amd/ntb_hw_amd.c

+8 −1
Original line number Diff line number Diff line
@@ -199,6 +199,11 @@ static int amd_link_is_up(struct amd_ntb_dev *ndev) 
	if (!ndev->peer_sta)

		return NTB_LNK_STA_ACTIVE(ndev->cntl_sta);



	if (ndev->peer_sta & AMD_LINK_UP_EVENT) {

		ndev->peer_sta = 0;

		return 1;

	}



	/* If peer_sta is reset or D0 event, the ISR has

	 * started a timer to check link status of hardware.

	 * So here just clear status bit. And if peer_sta is
@@ -207,7 +212,7 @@ static int amd_link_is_up(struct amd_ntb_dev *ndev) 
	 */

	if (ndev->peer_sta & AMD_PEER_RESET_EVENT)

		ndev->peer_sta &= ~AMD_PEER_RESET_EVENT;

	else if (ndev->peer_sta & AMD_PEER_D0_EVENT)

	else if (ndev->peer_sta & (AMD_PEER_D0_EVENT | AMD_LINK_DOWN_EVENT))

		ndev->peer_sta = 0;



	return 0;
@@ -491,6 +496,8 @@ static void amd_handle_event(struct amd_ntb_dev *ndev, int vec) 
		break;

	case AMD_PEER_D3_EVENT:

	case AMD_PEER_PMETO_EVENT:

	case AMD_LINK_UP_EVENT:

	case AMD_LINK_DOWN_EVENT:

		amd_ack_smu(ndev, status);



		/* link down */

drivers/ntb/hw/amd/ntb_hw_amd.h

+4 −1
Original line number Diff line number Diff line
@@ -148,9 +148,12 @@ enum { 
	AMD_PEER_D3_EVENT	= BIT(2),

	AMD_PEER_PMETO_EVENT	= BIT(3),

	AMD_PEER_D0_EVENT	= BIT(4),

	AMD_LINK_UP_EVENT	= BIT(5),

	AMD_LINK_DOWN_EVENT	= BIT(6),

	AMD_EVENT_INTMASK	= (AMD_PEER_FLUSH_EVENT |

				AMD_PEER_RESET_EVENT | AMD_PEER_D3_EVENT |

				AMD_PEER_PMETO_EVENT | AMD_PEER_D0_EVENT),

				AMD_PEER_PMETO_EVENT | AMD_PEER_D0_EVENT |

				AMD_LINK_UP_EVENT | AMD_LINK_DOWN_EVENT),



	AMD_PMESTAT_OFFSET	= 0x480,

	AMD_PMSGTRIG_OFFSET	= 0x490,