linux-kernel - [PATCH 2/6] s390: enable ARCH_HAS_PHYS_TO

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20241209192403.107090-3-mjrosato@linux.ibm.com>
Date: Mon,  9 Dec 2024 14:23:59 -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, farman@...ux.ibm.com,
        clegoate@...hat.com, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Subject: [PATCH 2/6] s390: enable ARCH_HAS_PHYS_TO_DMA

PCI devices on s390 have a DMA offset that is reported via CLP.  In
preparation for allowing identity domains, enable ARCH_HAS_PHYS_TO_DMA
for s390 and get the dma offset for all PCI devices from the reported
CLP value.

Reviewed-by: Niklas Schnelle <schnelle@...ux.ibm.com>
Signed-off-by: Matthew Rosato <mjrosato@...ux.ibm.com>
---
 arch/s390/Kconfig                  |  1 +
 arch/s390/include/asm/device.h     | 12 ++++++++++++
 arch/s390/include/asm/dma-direct.h | 14 ++++++++++++++
 arch/s390/pci/pci_bus.c            |  2 ++
 4 files changed, 29 insertions(+)
 create mode 100644 arch/s390/include/asm/device.h
 create mode 100644 arch/s390/include/asm/dma-direct.h

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 0077969170e8..5746d8abc8a7 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -83,6 +83,7 @@ config S390
 	select ARCH_HAS_FORTIFY_SOURCE
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_GIGANTIC_PAGE
+	select ARCH_HAS_PHYS_TO_DMA
 	select ARCH_HAS_KCOV
 	select ARCH_HAS_MEMBARRIER_SYNC_CORE
 	select ARCH_HAS_MEM_ENCRYPT
diff --git a/arch/s390/include/asm/device.h b/arch/s390/include/asm/device.h
new file mode 100644
index 000000000000..a6bf5e137a17
--- /dev/null
+++ b/arch/s390/include/asm/device.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_S390_DEVICE_H
+#define _ASM_S390_DEVICE_H
+
+struct dev_archdata {
+	dma_addr_t		dma_offset;
+};
+
+struct pdev_archdata {
+};
+
+#endif /* _ASM_S390_DEVICE_H */
diff --git a/arch/s390/include/asm/dma-direct.h b/arch/s390/include/asm/dma-direct.h
new file mode 100644
index 000000000000..9391820fca2c
--- /dev/null
+++ b/arch/s390/include/asm/dma-direct.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef ASM_S390_DMA_DIRECT_H
+#define ASM_S390_DMA_DIRECT_H 1
+
+static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
+{
+	return paddr + dev->archdata.dma_offset;
+}
+
+static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
+{
+	return daddr - dev->archdata.dma_offset;
+}
+#endif /* ASM_S390_DMA_DIRECT_H */
diff --git a/arch/s390/pci/pci_bus.c b/arch/s390/pci/pci_bus.c
index d5ace00d10f0..ec874ba858c6 100644
--- a/arch/s390/pci/pci_bus.c
+++ b/arch/s390/pci/pci_bus.c
@@ -288,6 +288,8 @@ void pcibios_bus_add_device(struct pci_dev *pdev)
 {
 	struct zpci_dev *zdev = to_zpci(pdev);
 
+	pdev->dev.archdata.dma_offset = zdev->start_dma;
+
 	/*
 	 * With pdev->no_vf_scan the common PCI probing code does not
 	 * perform PF/VF linking.
-- 
2.47.0