https://github.com/torvalds/linux
Revision 4033f35d174af4804a79fd5731d9e6be976f9f28 authored by Christoph Hellwig on 28 August 2017, 08:47:18 UTC, committed by Christoph Hellwig on 30 August 2017, 12:46:16 UTC
The NVMe 1.3 specification says in section 5.21.1.13:
"After a successful completion of a Set Features enabling the host memory
buffer, the host shall not write to the associated host memory region,
buffer size, or descriptor list until the host memory buffer has been
disabled."
While this doesn't state that the descriptor list must remain accessible
to the device it certainly implies it must remaing readable by the device.
So switch to a dma coherent allocation for the descriptor list just to be
safe - it's not like the cost for it matters compared to the actual
memory buffers.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Fixes: 87ad72a59a38 ("nvme-pci: implement host memory buffer support")
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History 
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Tip revision: 4033f35d174af4804a79fd5731d9e6be976f9f28 authored by Christoph Hellwig on 28 August 2017, 08:47:18 UTC
nvme-pci: use dma memory for the host memory buffer descriptors
nvme-pci: use dma memory for the host memory buffer descriptors
Tip revision: 4033f35
| File | Mode | Size |
|---|---|---|
| Documentation | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .cocciconfig | -rw-r--r-- | 59 bytes |
| .get_maintainer.ignore | -rw-r--r-- | 31 bytes |
| .gitattributes | -rw-r--r-- | 30 bytes |
| .gitignore | -rw-r--r-- | 1.3 KB |
| .mailmap | -rw-r--r-- | 8.1 KB |
| COPYING | -rw-r--r-- | 18.3 KB |
| CREDITS | -rw-r--r-- | 96.2 KB |
| Kbuild | -rw-r--r-- | 2.2 KB |
| Kconfig | -rw-r--r-- | 252 bytes |
| MAINTAINERS | -rw-r--r-- | 410.7 KB |
| Makefile | -rw-r--r-- | 58.8 KB |
| README | -rw-r--r-- | 722 bytes |
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