github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-27 16:44:58 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

iommu/riscv: Empty iommu queue before enabling it

Browse Source 
Changing cqen/fqen/pqen from 0 to 1 sets the cqh/fqt/pqt registers to 0.
But the cqt/fqh/pqh registers are left unmodified. This commit resets
cqt/fqh/pqh registers to ensure corresponding queues are empty before
being enabled during initialization.

Signed-off-by: Xu Lu <luxu.kernel@bytedance.com>
Link: https://lore.kernel.org/r/20250103093220.38106-2-luxu.kernel@bytedance.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Xu Lu 2025-01-03 17:32:19 +08:00 committed by Joerg Roedel
parent d5f88acdd6
commit 8d8d3752c0
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/iommu/riscv/iommu.c
View File

@ -240,6 +240,12 @@ static int riscv_iommu_queue_enable(struct riscv_iommu_device *iommu,
return rc;
}
/* Empty queue before enabling it */
if (queue->qid == RISCV_IOMMU_INTR_CQ)
riscv_iommu_writel(queue->iommu, Q_TAIL(queue), 0);
else
riscv_iommu_writel(queue->iommu, Q_HEAD(queue), 0);
/*
* Enable queue with interrupts, clear any memory fault if any.
* Wait for the hardware to acknowledge request and activate queue