diff options
| author | Michael Kelley <mikelley@microsoft.com> | 2022-03-24 19:14:51 +0300 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2022-03-29 15:12:50 +0300 |
| commit | 37200078ed6aa2ac3c88a01a64996133dccfdd34 (patch) | |
| tree | f207568ffac02555c7909b4c0fcaa53c6cdbf212 /include/asm-generic | |
| parent | 792f232d57ff28bbd5f9c4abe0466b23d5879dc8 (diff) | |
| download | linux-37200078ed6aa2ac3c88a01a64996133dccfdd34.tar.xz | |
Drivers: hv: vmbus: Propagate VMbus coherence to each VMbus device
VMbus synthetic devices are not represented in the ACPI DSDT -- only
the top level VMbus device is represented. As a result, on ARM64
coherence information in the _CCA method is not specified for
synthetic devices, so they default to not hardware coherent.
Drivers for some of these synthetic devices have been recently
updated to use the standard DMA APIs, and they are incurring extra
overhead of unneeded software coherence management.
Fix this by propagating coherence information from the VMbus node
in ACPI to the individual synthetic devices. There's no effect on
x86/x64 where devices are always hardware coherent.
Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/1648138492-2191-2-git-send-email-mikelley@microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Diffstat (limited to 'include/asm-generic')
| -rw-r--r-- | include/asm-generic/mshyperv.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h index c08758b6b364..c05d2ce9b6cd 100644 --- a/include/asm-generic/mshyperv.h +++ b/include/asm-generic/mshyperv.h @@ -269,6 +269,7 @@ bool hv_isolation_type_snp(void); u64 hv_ghcb_hypercall(u64 control, void *input, void *output, u32 input_size); void hyperv_cleanup(void); bool hv_query_ext_cap(u64 cap_query); +void hv_setup_dma_ops(struct device *dev, bool coherent); void *hv_map_memory(void *addr, unsigned long size); void hv_unmap_memory(void *addr); #else /* CONFIG_HYPERV */ |