I was trying to read files from a Samsung MZ-VLB1T0B NVME device, that was formatted with an ext4 filesystem. But I observed some memory corruptions for the loaded file in u-boot. Closer investigation revealed that the u-boot nvme driver can't handle large IO-operations that are not aligned with the 4KB pages of the NVME device. In detail the nvme driver would split the read operation into 2MB chunks. Due to the misalignment 513 prp-entries are needed for reading one such 2MB chunk. The driver split the read into 1 entry for prp1 and a prp-list containing 512 entries for prp2. The issue is now that the driver splitted this list across 2 pages (first page with 511 entries and pointer to the second page, second page containing a single entry). This split violated the nvme-spec (as all 512 entries of the list would fit on a single page) and caused the observed memory corruption. The provided patch fixes the issue. END
Alexander Sowarka (1): nvme: Fix multipage prp-list
drivers/nvme/nvme.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)