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authorNiklas Schnelle <schnelle@linux.ibm.com>2022-09-07 12:38:30 +0300
committerVasily Gorbik <gor@linux.ibm.com>2022-09-14 17:46:00 +0300
commit2187582c361fcd33a6ab5e9e6fef5b774c3b8cda (patch)
tree416efbb4ecbc83199d7d54c594af12eea9ea17fb /arch/s390/pci
parent50787755317ddf8c9bb3419a15b87c42237000cb (diff)
downloadlinux-2187582c361fcd33a6ab5e9e6fef5b774c3b8cda.tar.xz
s390/pci: convert high_memory to physical address
We use high_memory as a measure for amount of memory available in determining the required minimum size of our IOVA space with the assumption that one rarely maps more than the available memory for DMA. In special cases like mapping significant amounts of memory more than once this can still be tuned with the s390_iommu_apterture kernel parameter. In this use case high_memory is treated as a physical address. As high_memory is a virtual address however this means we need to convert it using virt_to_phys() before use Note that at the moment physical and virtual addresses are identical so this mismatch does not currently cause trouble. Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com> Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390/pci')
-rw-r--r--arch/s390/pci/pci_dma.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c
index f46833a25526..227cf0a62800 100644
--- a/arch/s390/pci/pci_dma.c
+++ b/arch/s390/pci/pci_dma.c
@@ -666,7 +666,7 @@ static int __init dma_alloc_cpu_table_caches(void)
int __init zpci_dma_init(void)
{
- s390_iommu_aperture = (u64)high_memory;
+ s390_iommu_aperture = (u64)virt_to_phys(high_memory);
if (!s390_iommu_aperture_factor)
s390_iommu_aperture = ULONG_MAX;
else