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Message-Id: <20240913-jag-iopfv8-v2-5-dea01c2343bc@samsung.com>
Date: Fri, 13 Sep 2024 13:44:51 +0200
From: Joel Granados via B4 Relay <devnull+j.granados.samsung.com@...nel.org>
To: David Woodhouse <dwmw2@...radead.org>,
Lu Baolu <baolu.lu@...ux.intel.com>, Joerg Roedel <joro@...tes.org>,
Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
Jason Gunthorpe <jgg@...pe.ca>, Kevin Tian <kevin.tian@...el.com>,
Klaus Jensen <its@...elevant.dk>
Cc: linux-kernel@...r.kernel.org, iommu@...ts.linux.dev,
Joel Granados <j.granados@...sung.com>, Klaus Jensen <k.jensen@...sung.com>
Subject: [PATCH v2 5/5] iommu/vt-d: drop pasid requirement for prq
initialization
From: Klaus Jensen <k.jensen@...sung.com>
PASID support within the IOMMU is not required to enable the Page
Request Queue, only the PRS capability.
Signed-off-by: Klaus Jensen <k.jensen@...sung.com>
Signed-off-by: Joel Granados <j.granados@...sung.com>
---
drivers/iommu/intel/iommu.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 3d1c971eb9e5..9f3bbdbd6372 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -1487,10 +1487,8 @@ static void free_dmar_iommu(struct intel_iommu *iommu)
/* free context mapping */
free_context_table(iommu);
- if (pasid_supported(iommu)) {
- if (ecap_prs(iommu->ecap))
- intel_finish_prq(iommu);
- }
+ if (ecap_prs(iommu->ecap))
+ intel_finish_prq(iommu);
}
/*
@@ -2480,7 +2478,7 @@ static int __init init_dmars(void)
iommu_flush_write_buffer(iommu);
- if (pasid_supported(iommu) && ecap_prs(iommu->ecap)) {
+ if (ecap_prs(iommu->ecap)) {
/*
* Call dmar_alloc_hwirq() with dmar_global_lock held,
* could cause possible lock race condition.
@@ -2921,7 +2919,7 @@ static int intel_iommu_add(struct dmar_drhd_unit *dmaru)
intel_iommu_init_qi(iommu);
iommu_flush_write_buffer(iommu);
- if (pasid_supported(iommu) && ecap_prs(iommu->ecap)) {
+ if (ecap_prs(iommu->ecap)) {
ret = intel_enable_prq(iommu);
if (ret)
goto disable_iommu;
--
2.43.0
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