linux-kernel - [PATCH AUTOSEL 5.4 36/49] iommu/amd: Call domain_flush_complete() in update

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Message-Id: <20200514185311.20294-36-sashal@kernel.org>
Date:   Thu, 14 May 2020 14:52:57 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Joerg Roedel <jroedel@...e.de>, Qian Cai <cai@....pw>,
        Sasha Levin <sashal@...nel.org>,
        iommu@...ts.linux-foundation.org
Subject: [PATCH AUTOSEL 5.4 36/49] iommu/amd: Call domain_flush_complete() in update_domain()

From: Joerg Roedel <jroedel@...e.de>

[ Upstream commit f44a4d7e4f1cdef73c90b1dc749c4d8a7372a8eb ]

The update_domain() function is expected to also inform the hardware
about domain changes. This needs a COMPLETION_WAIT command to be sent
to all IOMMUs which use the domain.

Signed-off-by: Joerg Roedel <jroedel@...e.de>
Tested-by: Qian Cai <cai@....pw>
Link: https://lore.kernel.org/r/20200504125413.16798-4-joro@8bytes.org
Signed-off-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iommu/amd_iommu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index bc77714983421..32de8e7bb8b45 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2386,6 +2386,7 @@ static void update_domain(struct protection_domain *domain)
 
 	domain_flush_devices(domain);
 	domain_flush_tlb_pde(domain);
+	domain_flush_complete(domain);
 }
 
 static int dir2prot(enum dma_data_direction direction)
-- 
2.20.1