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When large writes take place I saw a Samsung EVO 970+ return a status value of 0x13, PRP Offset Invalid. I tracked this down to the improper handling of PRP entries. The blocks the PRP entries are placed in cannot cross a page boundary and thus should be allocated on page boundaries. This is how the Linux kernel driver works. With this patch, the PRP pool is allocated on a page boundary and other than the very first allocation, the pool size is a multiple of the page size. Each page can hold (4096 / 8) - 1 entries since the last entry must point to the next page in the pool. Signed-off-by: Aaron Williams <awilliams@marvell.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> |
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| nvme_show.c | ||
| nvme-uclass.c | ||
| nvme.c | ||
| nvme.h | ||