Messages in this thread | | | Date | Fri, 15 Apr 2022 13:26:04 +0200 | From | Corentin Labbe <> | Subject | Re: [PATCH 0/2] riscv: implement Zicbom-based CMO instructions + the t-head variant |
| |
Le Mon, Mar 07, 2022 at 11:46:18PM +0100, Heiko Stuebner a écrit : > This series is based on the alternatives changes done in my svpbmt series > and thus also depends on Atish's isa-extension parsing series. > > It implements using the cache-management instructions from the Zicbom- > extension to handle cache flush, etc actions on platforms needing them. > > SoCs using cpu cores from T-Head like the Allwinne D1 implement a > different set of cache instructions. But while they are different, > instructions they provide the same functionality, so a variant can > easly hook into the existing alternatives mechanism on those. > >
Hello
I am testing https://github.com/smaeul/linux.git branch:origin/riscv/d1-wip which contain this serie.
I am hitting a buffer corruption problem with DMA. The sun8i-ce crypto driver fail self tests due to "device overran destination buffer". In fact the buffer is not overran by device but by dma_map_single() operation.
The following small code show the problem:
dma_addr_t dma; u8 *buf; #define BSIZE 2048 #define DMASIZE 16
buf = kmalloc(BSIZE, GFP_KERNEL | GFP_DMA); for (i = 0; i < BSIZE; i++) buf[i] = 0xFE; print_hex_dump(KERN_INFO, "DMATEST1:", DUMP_PREFIX_NONE, 16, 4, buf, 256, false); dma = dma_map_single(ce->dev, buf, DMASIZE, DMA_FROM_DEVICE); dma_unmap_single(ce->dev, dma, DMASIZE, DMA_FROM_DEVICE); print_hex_dump(KERN_INFO, "DMATEST3:", DUMP_PREFIX_NONE, 16, 4, buf, 256, false);
Will lead to: [ 2.960040] DMATEST1:fefefefe fefefefe fefefefe fefefefe [ 2.965354] DMATEST1:fefefefe fefefefe fefefefe fefefefe [ 2.970709] DMATEST1:fefefefe fefefefe fefefefe fefefefe [ 2.976069] DMATEST1:fefefefe fefefefe fefefefe fefefefe [ 2.981440] DMATEST1:fefefefe fefefefe fefefefe fefefefe [ 2.986814] DMATEST1:fefefefe fefefefe fefefefe fefefefe [ 2.992188] DMATEST1:fefefefe fefefefe fefefefe fefefefe [ 2.997560] DMATEST1:fefefefe fefefefe fefefefe fefefefe [ 3.002934] DMATEST1:fefefefe fefefefe fefefefe fefefefe [ 3.008307] DMATEST1:fefefefe fefefefe fefefefe fefefefe [ 3.013680] DMATEST1:fefefefe fefefefe fefefefe fefefefe [ 3.019054] DMATEST1:fefefefe fefefefe fefefefe fefefefe [ 3.024427] DMATEST1:fefefefe fefefefe fefefefe fefefefe [ 3.029802] DMATEST1:fefefefe fefefefe fefefefe fefefefe [ 3.035175] DMATEST1:fefefefe fefefefe fefefefe fefefefe [ 3.040546] DMATEST1:fefefefe fefefefe fefefefe fefefefe [ 3.401647] DMATEST3:a9c3a9c3 a9c3a9c3 a9c3a9c3 a9c3a9c3 [ 3.406982] DMATEST3:a9c3a9c3 a9c3a9c3 a9c3a9c3 a9c3a9c3 [ 3.412350] DMATEST3:a9c3a9c3 a9c3a9c3 a9c3a9c3 a9c3a9c3 [ 3.417720] DMATEST3:a9c3a9c3 a9c3a9c3 a9c3a9c3 a9c3a9c3 [ 3.423094] DMATEST3:fefefefe fefefefe fefefefe fefefefe [ 3.428468] DMATEST3:fefefefe fefefefe fefefefe fefefefe [ 3.433841] DMATEST3:fefefefe fefefefe fefefefe fefefefe [ 3.439213] DMATEST3:fefefefe fefefefe fefefefe fefefefe [ 3.444588] DMATEST3:fefefefe fefefefe fefefefe fefefefe [ 3.449962] DMATEST3:fefefefe fefefefe fefefefe fefefefe [ 3.455334] DMATEST3:fefefefe fefefefe fefefefe fefefefe [ 3.460707] DMATEST3:fefefefe fefefefe fefefefe fefefefe [ 3.466081] DMATEST3:fefefefe fefefefe fefefefe fefefefe [ 3.471454] DMATEST3:fefefefe fefefefe fefefefe fefefefe [ 3.476828] DMATEST3:fefefefe fefefefe fefefefe fefefefe [ 3.482200] DMATEST3:fefefefe fefefefe fefefefe fefefefe
Even with no DMA action, the buffer is corrupted.
Regards
| |