From 378efe798ecf0e7d9730a595ef3419b046e34fb4 Mon Sep 17 00:00:00 2001 From: Wei Hu\(Xavier\) Date: Tue, 28 Nov 2017 15:10:28 +0800 Subject: RDMA/hns: Get rid of page operation after dma_alloc_coherent In general, dma_alloc_coherent() returns a CPU virtual address and a DMA address, and we have no guarantee that the underlying memory even has an associated struct page at all. This patch gets rid of the page operation after dma_alloc_coherent, and records the VA returned form dma_alloc_coherent in the struct of hem in hns RoCE driver. Fixes: 9a44353("IB/hns: Add driver files for hns RoCE driver") Signed-off-by: Wei Hu (Xavier) Signed-off-by: Shaobo Xu Signed-off-by: Lijun Ou Signed-off-by: Yixian Liu Signed-off-by: Xiping Zhang (Francis) Signed-off-by: Jason Gunthorpe --- drivers/infiniband/hw/hns/hns_roce_hem.c | 25 +++++++++++++------------ drivers/infiniband/hw/hns/hns_roce_hem.h | 1 + 2 files changed, 14 insertions(+), 12 deletions(-) (limited to 'drivers/infiniband') diff --git a/drivers/infiniband/hw/hns/hns_roce_hem.c b/drivers/infiniband/hw/hns/hns_roce_hem.c index 8b733a66fae5..0eeabfbee192 100644 --- a/drivers/infiniband/hw/hns/hns_roce_hem.c +++ b/drivers/infiniband/hw/hns/hns_roce_hem.c @@ -224,6 +224,7 @@ static struct hns_roce_hem *hns_roce_alloc_hem(struct hns_roce_dev *hr_dev, sg_init_table(chunk->mem, HNS_ROCE_HEM_CHUNK_LEN); chunk->npages = 0; chunk->nsg = 0; + memset(chunk->buf, 0, sizeof(chunk->buf)); list_add_tail(&chunk->list, &hem->chunk_list); } @@ -240,8 +241,7 @@ static struct hns_roce_hem *hns_roce_alloc_hem(struct hns_roce_dev *hr_dev, if (!buf) goto fail; - sg_set_buf(mem, buf, PAGE_SIZE << order); - WARN_ON(mem->offset); + chunk->buf[chunk->npages] = buf; sg_dma_len(mem) = PAGE_SIZE << order; ++chunk->npages; @@ -267,8 +267,8 @@ void hns_roce_free_hem(struct hns_roce_dev *hr_dev, struct hns_roce_hem *hem) list_for_each_entry_safe(chunk, tmp, &hem->chunk_list, list) { for (i = 0; i < chunk->npages; ++i) dma_free_coherent(hr_dev->dev, - chunk->mem[i].length, - lowmem_page_address(sg_page(&chunk->mem[i])), + sg_dma_len(&chunk->mem[i]), + chunk->buf[i], sg_dma_address(&chunk->mem[i])); kfree(chunk); } @@ -722,11 +722,12 @@ void *hns_roce_table_find(struct hns_roce_dev *hr_dev, struct hns_roce_hem_chunk *chunk; struct hns_roce_hem_mhop mhop; struct hns_roce_hem *hem; - struct page *page = NULL; + void *addr = NULL; unsigned long mhop_obj = obj; unsigned long obj_per_chunk; unsigned long idx_offset; int offset, dma_offset; + int length; int i, j; u32 hem_idx = 0; @@ -763,25 +764,25 @@ void *hns_roce_table_find(struct hns_roce_dev *hr_dev, list_for_each_entry(chunk, &hem->chunk_list, list) { for (i = 0; i < chunk->npages; ++i) { + length = sg_dma_len(&chunk->mem[i]); if (dma_handle && dma_offset >= 0) { - if (sg_dma_len(&chunk->mem[i]) > - (u32)dma_offset) + if (length > (u32)dma_offset) *dma_handle = sg_dma_address( &chunk->mem[i]) + dma_offset; - dma_offset -= sg_dma_len(&chunk->mem[i]); + dma_offset -= length; } - if (chunk->mem[i].length > (u32)offset) { - page = sg_page(&chunk->mem[i]); + if (length > (u32)offset) { + addr = chunk->buf[i] + offset; goto out; } - offset -= chunk->mem[i].length; + offset -= length; } } out: mutex_unlock(&table->mutex); - return page ? lowmem_page_address(page) + offset : NULL; + return addr; } EXPORT_SYMBOL_GPL(hns_roce_table_find); diff --git a/drivers/infiniband/hw/hns/hns_roce_hem.h b/drivers/infiniband/hw/hns/hns_roce_hem.h index db66db12075e..e8850d59e780 100644 --- a/drivers/infiniband/hw/hns/hns_roce_hem.h +++ b/drivers/infiniband/hw/hns/hns_roce_hem.h @@ -78,6 +78,7 @@ struct hns_roce_hem_chunk { int npages; int nsg; struct scatterlist mem[HNS_ROCE_HEM_CHUNK_LEN]; + void *buf[HNS_ROCE_HEM_CHUNK_LEN]; }; struct hns_roce_hem { -- cgit v1.2.3