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| author | Niklas Schnelle <schnelle@linux.ibm.com> | 2022-11-09 17:29:03 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2022-11-19 12:28:18 +0300 |
| commit | 21c1f9021f0e7d28c3edfcc70e1ca1926ea3774e (patch) | |
| tree | 6322eb5fdba1271c77978cb03e7accb21d3e7f64 /arch/s390/include/asm/pci.h | |
| parent | 08955af0600303455f57fe2f2a26f24f9b496b49 (diff) | |
| download | linux-21c1f9021f0e7d28c3edfcc70e1ca1926ea3774e.tar.xz | |
s390/pci: use lock-free I/O translation updates
I/O translation tables on s390 use 8 byte page table entries and tables
which are allocated lazily but only freed when the entire I/O
translation table is torn down. Also each IOVA can at any time only
translate to one physical address Furthermore I/O table accesses by the
IOMMU hardware are cache coherent. With a bit of care we can thus use
atomic updates to manipulate the translation table without having to use
a global lock at all. This is done analogous to the existing I/O
translation table handling code used on Intel and AMD x86 systems.
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Link: https://lore.kernel.org/r/20221109142903.4080275-6-schnelle@linux.ibm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'arch/s390/include/asm/pci.h')
| -rw-r--r-- | arch/s390/include/asm/pci.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h index e4c3e4e04d30..b248694e0024 100644 --- a/arch/s390/include/asm/pci.h +++ b/arch/s390/include/asm/pci.h @@ -157,7 +157,6 @@ struct zpci_dev { /* DMA stuff */ unsigned long *dma_table; - spinlock_t dma_table_lock; int tlb_refresh; spinlock_t iommu_bitmap_lock; |