linux-kernel - [PATCH 2/7] s390/pci: set appropriate IOTA region type

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Message-ID: <20241209192549.107226-3-mjrosato@linux.ibm.com>
Date: Mon,  9 Dec 2024 14:25:44 -0500
From: Matthew Rosato <mjrosato@...ux.ibm.com>
To: joro@...tes.org, will@...nel.org, robin.murphy@....com,
        gerald.schaefer@...ux.ibm.com, schnelle@...ux.ibm.com
Cc: hca@...ux.ibm.com, gor@...ux.ibm.com, agordeev@...ux.ibm.com,
        svens@...ux.ibm.com, borntraeger@...ux.ibm.com, clegoate@...hat.com,
        iommu@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org
Subject: [PATCH 2/7] s390/pci: set appropriate IOTA region type

When registering the I/O Translation Anchor, use the current table type
stored in the zdev to set the apporpriate region type indication.

Signed-off-by: Matthew Rosato <mjrosato@...ux.ibm.com>
---
 arch/s390/pci/pci.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
index 88f72745fa59..9f7adf913729 100644
--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c
@@ -116,6 +116,21 @@ int pci_proc_domain(struct pci_bus *bus)
 }
 EXPORT_SYMBOL_GPL(pci_proc_domain);
 
+static u64 zpci_get_iota_region_flag(struct zpci_dev *zdev)
+{
+	switch (zdev->origin_type) {
+	case ZPCI_TABLE_TYPE_RTX:
+		return ZPCI_IOTA_RTTO_FLAG;
+	case ZPCI_TABLE_TYPE_RSX:
+		return ZPCI_IOTA_RSTO_FLAG;
+	case ZPCI_TABLE_TYPE_RFX:
+		return ZPCI_IOTA_RFTO_FLAG;
+	default:
+		WARN_ONCE(1, "Invalid IOMMU table (%x)\n", zdev->origin_type);
+		return 0;
+	}
+}
+
 /* Modify PCI: Register I/O address translation parameters */
 int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
 		       u64 base, u64 limit, u64 iota, u8 *status)
@@ -131,7 +146,7 @@ int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
 		fib.pal = limit + (1 << 12);
 	else
 		fib.pal = limit;
-	fib.iota = iota | ZPCI_IOTA_RTTO_FLAG;
+	fib.iota = iota | zpci_get_iota_region_flag(zdev);
 	fib.gd = zdev->gisa;
 	cc = zpci_mod_fc(req, &fib, status);
 	if (cc)
-- 
2.47.0