[RFC PATCH 21/21] pci: Define pci_iomap_range_encrypted
From: Alexey Kardashevskiy <hidden>
Date: 2024-08-23 13:33:35
Also in:
kvm, linux-iommu, linux-pci
Subsystem:
generic include/asm header files, pci subsystem, the rest · Maintainers:
Arnd Bergmann, Bjorn Helgaas, Linus Torvalds
So far PCI BARs could not be mapped as encrypted so there was no need in API supporting encrypted mappings. TDISP is adding such support so add pci_iomap_range_encrypted() to allow PCI drivers do the encrypted mapping when needed. Signed-off-by: Alexey Kardashevskiy <redacted> --- include/asm-generic/pci_iomap.h | 4 ++++ drivers/pci/iomap.c | 24 ++++++++++++++++++++ 2 files changed, 28 insertions(+)
diff --git a/include/asm-generic/pci_iomap.h b/include/asm-generic/pci_iomap.h
index 8fbb0a55545d..d7b922c5ab86 100644
--- a/include/asm-generic/pci_iomap.h
+++ b/include/asm-generic/pci_iomap.h@@ -15,6 +15,10 @@ extern void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long ma extern void __iomem *pci_iomap_range(struct pci_dev *dev, int bar, unsigned long offset, unsigned long maxlen); +extern void __iomem *pci_iomap_range_encrypted(struct pci_dev *dev, + int bar, + unsigned long offset, + unsigned long maxlen); extern void __iomem *pci_iomap_wc_range(struct pci_dev *dev, int bar, unsigned long offset, unsigned long maxlen);
diff --git a/drivers/pci/iomap.c b/drivers/pci/iomap.c
index a715a4803c95..2bf8ef4f672b 100644
--- a/drivers/pci/iomap.c
+++ b/drivers/pci/iomap.c@@ -52,6 +52,30 @@ void __iomem *pci_iomap_range(struct pci_dev *dev, } EXPORT_SYMBOL(pci_iomap_range); +void __iomem *pci_iomap_range_encrypted(struct pci_dev *dev, + int bar, + unsigned long offset, + unsigned long maxlen) +{ + resource_size_t start = pci_resource_start(dev, bar); + resource_size_t len = pci_resource_len(dev, bar); + unsigned long flags = pci_resource_flags(dev, bar); + + if (len <= offset || !start) + return NULL; + len -= offset; + start += offset; + if (maxlen && len > maxlen) + len = maxlen; + if (flags & IORESOURCE_IO) + return NULL; + if (flags & IORESOURCE_MEM) + return ioremap_encrypted(start, len); + /* What? */ + return NULL; +} +EXPORT_SYMBOL(pci_iomap_range_encrypted); + /** * pci_iomap_wc_range - create a virtual WC mapping cookie for a PCI BAR * @dev: PCI device that owns the BAR
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2.45.2