From c4eef59faab6ae4ecb1beae6d4391b0889bc3ff3 Mon Sep 17 00:00:00 2001 From: Jon Lin Date: Tue, 19 Oct 2021 10:40:54 +0800 Subject: [PATCH] nvme: Fix error in nvme_setup_prps MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Consulting to "NVM Express® Base Specification, revision 2.0". If more PRP List pages are required, then the last entry of the PRP List contains the Page Base Address of the next PRP List page. The next PRP List page shall be memory page aligned. Signed-off-by: Jon Lin Reviewed-by: Shawn Lin --- drivers/nvme/nvme.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/nvme/nvme.c b/drivers/nvme/nvme.c index 9623c89..22ded62 100644 --- a/drivers/nvme/nvme.c +++ b/drivers/nvme/nvme.c @@ -100,7 +100,7 @@ static int nvme_setup_prps(struct nvme_dev *dev, u64 *prp2, } nprps = DIV_ROUND_UP(length, page_size); - num_pages = DIV_ROUND_UP(nprps, prps_per_page); + num_pages = DIV_ROUND_UP(nprps + 1, prps_per_page); if (nprps > dev->prp_entry_num) { free(dev->prp_pool); @@ -119,10 +119,11 @@ static int nvme_setup_prps(struct nvme_dev *dev, u64 *prp2, prp_pool = dev->prp_pool; i = 0; while (nprps) { - if (i == ((page_size >> 3) - 1)) { - *(prp_pool + i) = cpu_to_le64((ulong)prp_pool + + if (i == prps_per_page) { + *(prp_pool + i) = *(prp_pool + i - 1); + *(prp_pool + i - 1) = cpu_to_le64((ulong)prp_pool + page_size); - i = 0; + i = 1; prp_pool += page_size; } *(prp_pool + i++) = cpu_to_le64(dma_addr); -- 2.7.4