linux-kernel - [PATCH v1 1/4] iommu: Pass the Requester ID in the fault parameter structure

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Message-ID: <20250710134215.97840-2-sergey.temerkhanov@intel.com>
Date: Thu, 10 Jul 2025 13:42:12 +0000
From: Sergey Temerkhanov <sergey.temerkhanov@...el.com>
To: iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Cc: 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>,
	Sergey Temerkhanov <sergey.temerkhanov@...el.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1 1/4] iommu: Pass the Requester ID in the fault parameter structure

Pass the Requester ID in the fault parameter structure to facilitate
requester notifications on IOMMU faults.

Signed-off-by: Sergey Temerkhanov <sergey.temerkhanov@...el.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/iommu/intel/prq.c | 1 +
 include/linux/iommu.h     | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/drivers/iommu/intel/prq.c b/drivers/iommu/intel/prq.c
index 52570e42a14c..d88385adc3cb 100644
--- a/drivers/iommu/intel/prq.c
+++ b/drivers/iommu/intel/prq.c
@@ -181,6 +181,7 @@ static void intel_prq_report(struct intel_iommu *iommu, struct device *dev,
 	/* Fill in event data for device specific processing */
 	event.fault.type = IOMMU_FAULT_PAGE_REQ;
 	event.fault.prm.addr = (u64)desc->addr << VTD_PAGE_SHIFT;
+	event.fault.prm.rid = desc->rid;
 	event.fault.prm.pasid = desc->pasid;
 	event.fault.prm.grpid = desc->prg_index;
 	event.fault.prm.perm = prq_to_iommu_prot(desc);
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 156732807994..4ddb63a3f2cf 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -65,6 +65,7 @@ enum iommu_fault_type {
  *         When IOMMU_FAULT_PAGE_RESPONSE_NEEDS_PASID is set, the page response
  *         must have the same PASID value as the page request. When it is clear,
  *         the page response should not have a PASID.
+ * @rid: Requester ID
  * @pasid: Process Address Space ID
  * @grpid: Page Request Group Index
  * @perm: requested page permissions (IOMMU_FAULT_PERM_* values)
@@ -76,6 +77,7 @@ struct iommu_fault_page_request {
 #define IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE	(1 << 1)
 #define IOMMU_FAULT_PAGE_RESPONSE_NEEDS_PASID	(1 << 2)
 	u32	flags;
+	u32	rid;
 	u32	pasid;
 	u32	grpid;
 	u32	perm;
-- 
2.43.0