From 313abe55a87bc10e55d00f337d609e17ad5f8c9a Mon Sep 17 00:00:00 2001 From: Jack Morgenstein Date: Mon, 28 Jan 2008 10:40:51 +0200 Subject: mlx4_core: For 64-bit systems, vmap() kernel queue buffers Since kernel virtual memory is not a problem on 64-bit systems, there is no reason to use our own 2-layer page mapping scheme for large kernel queue buffers on such systems. Instead, map the page list to a single virtually contiguous buffer with vmap(), so that can we access buffer memory via direct indexing. Signed-off-by: Michael S. Tsirkin Signed-off-by: Jack Morgenstein Signed-off-by: Roland Dreier --- drivers/net/mlx4/alloc.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'drivers/net/mlx4') diff --git a/drivers/net/mlx4/alloc.c b/drivers/net/mlx4/alloc.c index b226e019bc8b..2da2c2ec1f22 100644 --- a/drivers/net/mlx4/alloc.c +++ b/drivers/net/mlx4/alloc.c @@ -151,6 +151,19 @@ int mlx4_buf_alloc(struct mlx4_dev *dev, int size, int max_direct, memset(buf->u.page_list[i].buf, 0, PAGE_SIZE); } + + if (BITS_PER_LONG == 64) { + struct page **pages; + pages = kmalloc(sizeof *pages * buf->nbufs, GFP_KERNEL); + if (!pages) + goto err_free; + for (i = 0; i < buf->nbufs; ++i) + pages[i] = virt_to_page(buf->u.page_list[i].buf); + buf->u.direct.buf = vmap(pages, buf->nbufs, VM_MAP, PAGE_KERNEL); + kfree(pages); + if (!buf->u.direct.buf) + goto err_free; + } } return 0; @@ -170,6 +183,9 @@ void mlx4_buf_free(struct mlx4_dev *dev, int size, struct mlx4_buf *buf) dma_free_coherent(&dev->pdev->dev, size, buf->u.direct.buf, buf->u.direct.map); else { + if (BITS_PER_LONG == 64) + vunmap(buf->u.direct.buf); + for (i = 0; i < buf->nbufs; ++i) if (buf->u.page_list[i].buf) dma_free_coherent(&dev->pdev->dev, PAGE_SIZE, -- cgit v1.2.1