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iommu/amd: Update event log pointer as soon as processing is complete

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Update event buffer head pointer once driver completes processing. So
that IOMMU can write new log without waiting for driver to complete
processing all event logs.

Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Link: https://lore.kernel.org/r/20240828111029.5429-2-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Vasant Hegde
2024-08-28 11:10:22 +00:00
committed by Joerg Roedel
parent 014e756247
commit fdc39b77db
1 changed files with 3 additions and 1 deletions
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drivers/iommu/amd/iommu.c
+3 -1
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@@ -825,10 +825,12 @@ static void iommu_poll_events(struct amd_iommu *iommu)
while (head != tail) {
iommu_print_event(iommu, iommu->evt_buf + head);
/* Update head pointer of hardware ring-buffer */
head = (head + EVENT_ENTRY_SIZE) % EVT_BUFFER_SIZE;
writel(head, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
}
writel(head, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
}
#ifdef CONFIG_IRQ_REMAP