From 4007b493ee6e4a52c2b618ab8361847fba5bf116 Mon Sep 17 00:00:00 2001 From: Olof Johansson Date: Tue, 2 Oct 2007 20:45:27 -0500 Subject: [PATCH] libata: fix for sata_mv >64KB DMA segments Fix bug in sata_mv for cases where the IOMMU layer has merged SG entries to larger than 64KB. They need to be split up before being sent to the driver. Just for simplicity's sake, split up at 64K boundary instead of 64K size, since that's what the common code does anyway. Signed-off-by: Olof Johansson Signed-off-by: Jeff Garzik --- drivers/ata/sata_mv.c | 26 +++++++++++++++++++------- 1 file changed, 19 insertions(+), 7 deletions(-) diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c index 11bf6c7ac12..1a82e22b3ef 100644 --- a/drivers/ata/sata_mv.c +++ b/drivers/ata/sata_mv.c @@ -1139,15 +1139,27 @@ static unsigned int mv_fill_sg(struct ata_queued_cmd *qc) dma_addr_t addr = sg_dma_address(sg); u32 sg_len = sg_dma_len(sg); - mv_sg->addr = cpu_to_le32(addr & 0xffffffff); - mv_sg->addr_hi = cpu_to_le32((addr >> 16) >> 16); - mv_sg->flags_size = cpu_to_le32(sg_len & 0xffff); + while (sg_len) { + u32 offset = addr & 0xffff; + u32 len = sg_len; - if (ata_sg_is_last(sg, qc)) - mv_sg->flags_size |= cpu_to_le32(EPRD_FLAG_END_OF_TBL); + if ((offset + sg_len > 0x10000)) + len = 0x10000 - offset; + + mv_sg->addr = cpu_to_le32(addr & 0xffffffff); + mv_sg->addr_hi = cpu_to_le32((addr >> 16) >> 16); + mv_sg->flags_size = cpu_to_le32(len); + + sg_len -= len; + addr += len; + + if (!sg_len && ata_sg_is_last(sg, qc)) + mv_sg->flags_size |= cpu_to_le32(EPRD_FLAG_END_OF_TBL); + + mv_sg++; + n_sg++; + } - mv_sg++; - n_sg++; } return n_sg; -- 2.41.1