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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 <mst@dev.mellanox.co.il> Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il> Signed-off-by: Roland Dreier <rolandd@cisco.com>
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parent
1c69fc2a90
commit
313abe55a8
2 changed files with 18 additions and 2 deletions
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@ -151,6 +151,19 @@ int mlx4_buf_alloc(struct mlx4_dev *dev, int size, int max_direct,
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memset(buf->u.page_list[i].buf, 0, PAGE_SIZE);
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}
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if (BITS_PER_LONG == 64) {
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struct page **pages;
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pages = kmalloc(sizeof *pages * buf->nbufs, GFP_KERNEL);
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if (!pages)
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goto err_free;
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for (i = 0; i < buf->nbufs; ++i)
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pages[i] = virt_to_page(buf->u.page_list[i].buf);
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buf->u.direct.buf = vmap(pages, buf->nbufs, VM_MAP, PAGE_KERNEL);
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kfree(pages);
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if (!buf->u.direct.buf)
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goto err_free;
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}
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}
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return 0;
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@ -170,6 +183,9 @@ void mlx4_buf_free(struct mlx4_dev *dev, int size, struct mlx4_buf *buf)
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dma_free_coherent(&dev->pdev->dev, size, buf->u.direct.buf,
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buf->u.direct.map);
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else {
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if (BITS_PER_LONG == 64)
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vunmap(buf->u.direct.buf);
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for (i = 0; i < buf->nbufs; ++i)
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if (buf->u.page_list[i].buf)
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dma_free_coherent(&dev->pdev->dev, PAGE_SIZE,
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@ -189,7 +189,7 @@ struct mlx4_buf_list {
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};
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struct mlx4_buf {
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union {
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struct {
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struct mlx4_buf_list direct;
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struct mlx4_buf_list *page_list;
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} u;
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@ -310,7 +310,7 @@ int mlx4_buf_alloc(struct mlx4_dev *dev, int size, int max_direct,
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void mlx4_buf_free(struct mlx4_dev *dev, int size, struct mlx4_buf *buf);
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static inline void *mlx4_buf_offset(struct mlx4_buf *buf, int offset)
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{
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if (buf->nbufs == 1)
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if (BITS_PER_LONG == 64 || buf->nbufs == 1)
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return buf->u.direct.buf + offset;
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else
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return buf->u.page_list[offset >> PAGE_SHIFT].buf +
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