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authorMichael Kelley <mikelley@microsoft.com>2022-03-24 09:14:51 -0700
committerWei Liu <wei.liu@kernel.org>2022-03-29 12:12:50 +0000
commit37200078ed6aa2ac3c88a01a64996133dccfdd34 (patch)
treef207568ffac02555c7909b4c0fcaa53c6cdbf212 /include/asm-generic
parent792f232d57ff28bbd5f9c4abe0466b23d5879dc8 (diff)
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.h1
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 */