Messages in this thread | | | From | Xianting Tian <> | Subject | [PATCH v4 0/2] make hvc pass dma capable memory to its backend | Date | Fri, 6 Aug 2021 11:01:36 +0800 |
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Dear all,
This patch series make hvc framework pass DMA capable memory to put_chars() of hvc backend(eg, virtio-console), and revert commit c4baad5029 ("virtio-console: avoid DMA from stack”)
V1 virtio-console: avoid DMA from vmalloc area https://lkml.org/lkml/2021/7/27/494
For v1 patch, Arnd Bergmann suggests to fix the issue in the first place: Make hvc pass DMA capable memory to put_chars() The fix suggestion is included in v2.
V2 [PATCH 1/2] tty: hvc: pass DMA capable memory to put_chars() https://lkml.org/lkml/2021/8/1/8 [PATCH 2/2] virtio-console: remove unnecessary kmemdup() https://lkml.org/lkml/2021/8/1/9
For v2 patch, Arnd Bergmann suggests to make new buf part of the hvc_struct structure, and fix the compile issue. The fix suggestion is included in v3.
V3 [PATCH v3 1/2] tty: hvc: pass DMA capable memory to put_chars() https://lkml.org/lkml/2021/8/3/1347 [PATCH v3 2/2] virtio-console: remove unnecessary kmemdup() https://lkml.org/lkml/2021/8/3/1348
For v3 patch, Jiri Slaby suggests to make 'char c[N_OUTBUF]' part of hvc_struct, and make 'hp->outbuf' aligned and use struct_size() to calculate the size of hvc_struct. The fix suggestion is included in v4.
drivers/char/virtio_console.c | 12 ++---------- drivers/tty/hvc/hvc_console.c | 33 ++++++++++++++++++--------------- drivers/tty/hvc/hvc_console.h | 16 ++++++++++++++-- 3 file changed
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