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| author | Li Chen <me@linux.beauty> | 2026-06-30 17:23:35 +0800 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2026-08-19 06:38:46 -0400 |
| commit | 8de2bc46dbeadbcb6c1e119d72ffa59a630195fb (patch) | |
| tree | 8e1fc98ea1d85a0d89c5123bf7cd8b391a2697cd | |
| parent | 3f14003ce7f03cd77cea54ff072d437016b9393e (diff) | |
| download | linux-8de2bc46dbeadbcb6c1e119d72ffa59a630195fb.tar.gz linux-8de2bc46dbeadbcb6c1e119d72ffa59a630195fb.zip | |
nvdimm: virtio_pmem: isolate DMA request buffers
The virtio-pmem request object stores wait queues, flags, and list
pointers next to buffers mapped for virtqueue DMA. The response buffer is
mapped DMA_FROM_DEVICE, so non-coherent DMA invalidation must not share a
cache line with CPU-owned fields.
Keep the request buffer outside the DMA-from-device group and wrap only
the response buffer with __dma_from_device_group_begin/end.
Signed-off-by: Li Chen <me@linux.beauty>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Message-ID: <20260630092338.2094628-11-me@linux.beauty>
| -rw-r--r-- | drivers/nvdimm/virtio_pmem.h | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/nvdimm/virtio_pmem.h b/drivers/nvdimm/virtio_pmem.h index 3af92588bd9d..8843a8b96587 100644 --- a/drivers/nvdimm/virtio_pmem.h +++ b/drivers/nvdimm/virtio_pmem.h @@ -10,6 +10,7 @@ #ifndef _LINUX_VIRTIO_PMEM_H #define _LINUX_VIRTIO_PMEM_H +#include <linux/dma-mapping.h> #include <linux/module.h> #include <uapi/linux/virtio_pmem.h> #include <linux/kref.h> @@ -20,8 +21,6 @@ struct virtio_pmem_request { struct kref kref; - struct virtio_pmem_req req; - struct virtio_pmem_resp resp; /* Wait queue to process deferred work after ack from host */ wait_queue_head_t host_acked; @@ -31,6 +30,11 @@ struct virtio_pmem_request { wait_queue_head_t wq_buf; bool wq_buf_avail; struct list_head list; + + struct virtio_pmem_req req; + __dma_from_device_group_begin(resp); + struct virtio_pmem_resp resp; + __dma_from_device_group_end(resp); }; struct virtio_pmem { |