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| author | John David Anglin <dave.anglin@bell.net> | 2022-03-30 14:42:30 +0000 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2022-05-23 13:44:24 +0200 |
| commit | 1fc7db2401d62df5a0b19250ddf3bb89d430dd86 (patch) | |
| tree | 821739050a04c307d8e6fcba3dda433be2fff7d5 /arch/parisc/kernel/cache.c | |
| parent | 41dc0b53bcb1be3840bd616aea67f5b73400c169 (diff) | |
| download | linux-1fc7db2401d62df5a0b19250ddf3bb89d430dd86.tar.bz2 | |
parisc: Don't enforce DMA completion order in cache flushes
The only place we need to ensure all outstanding cache coherence
operations are complete is in invalidate_kernel_vmap_range. All
parisc drivers synchronize DMA operations internally and do not
call invalidate_kernel_vmap_range. We only need this for non-coherent
I/O operations.
Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch/parisc/kernel/cache.c')
| -rw-r--r-- | arch/parisc/kernel/cache.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c index 0fd04073d4b6..c8a11fcecf4c 100644 --- a/arch/parisc/kernel/cache.c +++ b/arch/parisc/kernel/cache.c @@ -754,6 +754,9 @@ void invalidate_kernel_vmap_range(void *vaddr, int size) unsigned long start = (unsigned long)vaddr; unsigned long end = start + size; + /* Ensure DMA is complete */ + asm_syncdma(); + if ((!IS_ENABLED(CONFIG_SMP) || !arch_irqs_disabled()) && (unsigned long)size >= parisc_cache_flush_threshold) { flush_tlb_kernel_range(start, end); |