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    Subject[PATCH 9/9] ttm/dma: Implement set_page_caching implementation in the TTM DMA pool code.
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    . which is pretty much like the other TTM pool except it
    also handles moving the page to another pool list.

    Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    ---
    drivers/gpu/drm/ttm/ttm_page_alloc_dma.c | 96 ++++++++++++++++++++++++++++++
    1 files changed, 96 insertions(+), 0 deletions(-)

    diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
    index 5909d28..cea031e 100644
    --- a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
    +++ b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
    @@ -1307,11 +1307,107 @@ static int ttm_dma_page_alloc_debugfs(struct seq_file *m, void *data)
    mutex_unlock(&_manager->lock);
    return 0;
    }
    +#ifdef CONFIG_X86
    +static int ttm_dma_page_set_page_caching(struct page *p,
    + int flags,
    + enum ttm_caching_state c_old,
    + enum ttm_caching_state c_new,
    + struct device *dev)
    +{
    + struct dma_pool *src, *dst;
    + enum pool_type type;
    + struct dma_page *dma_p;
    + bool found = false;
    + unsigned long irq_flags;
    + int ret = 0;
    +
    + if (!p)
    + return 0;
    +
    + if (PageHighMem(p))
    + return 0;
    +
    + type = ttm_to_type(flags, c_old);
    + src = ttm_dma_find_pool(dev, type);
    + if (!src) {
    + WARN_ON(!src);
    + return -ENOMEM;
    + }
    + type = ttm_to_type(flags, c_new);
    + dst = ttm_dma_find_pool(dev, type);
    + if (!dst) {
    + gfp_t gfp_flags;
    + if (flags & TTM_PAGE_FLAG_DMA32)
    + gfp_flags = GFP_USER | GFP_DMA32;
    + else
    + gfp_flags = GFP_HIGHUSER;
    +
    + if (flags & TTM_PAGE_FLAG_ZERO_ALLOC)
    + gfp_flags |= __GFP_ZERO;
    +
    + dst = ttm_dma_pool_init(dev, gfp_flags, type);
    + if (IS_ERR_OR_NULL(dst))
    + return -ENOMEM;
    + }
    +
    + dev_dbg(dev, "(%d) Caching %p (%p) from %x to %x.\n", current->pid,
    + p, page_address(p), c_old, c_new);
    +
    + if (c_old != tt_cached) {
    + /* p isn't in the default caching state, set it to
    + * writeback first to free its current memtype. */
    +
    + ret = set_pages_wb(p, 1);
    + if (ret)
    + return ret;
    + }

    + if (c_new == tt_wc)
    + ret = set_memory_wc((unsigned long) page_address(p), 1);
    + else if (c_new == tt_uncached)
    + ret = set_pages_uc(p, 1);
    +
    + if (ret)
    + return ret;
    +
    + dev_dbg(src->dev, "(%s:%d) Moving %p (%p) to %s.\n", src->name,
    + current->pid, p, page_address(p), dst->name);
    +
    + /* To make it faster we only take the spinlock on list
    + * removal, and later on adding the page to the destination pool. */
    + spin_lock_irqsave(&src->lock, irq_flags);
    + list_for_each_entry(dma_p, &src->page_list, page_list) {
    + if (virt_to_page(dma_p->vaddr) != p) {
    + pr_debug("%s: (%s:%d) Skipping %p (%p) (DMA:0x%lx)\n",
    + src->dev_name, src->name, current->pid,
    + dma_p->vaddr,
    + virt_to_page(dma_p->vaddr),
    + (unsigned long)dma_p->dma);
    + continue;
    + }
    + list_del(&dma_p->page_list);
    + src->npages_in_use -= 1;
    + found = true;
    + break;
    + }
    + spin_lock_irqsave(&src->lock, irq_flags);
    + if (!found)
    + return -ENODEV;
    +
    + spin_lock_irqsave(&dst->lock, irq_flags);
    + list_add(&dma_p->page_list, &dst->page_list);
    + dst->npages_in_use++;
    + spin_unlock_irqrestore(&dst->lock, irq_flags);
    + return 0;
    +};
    +#endif
    struct ttm_page_alloc_func ttm_page_alloc_dma = {
    .get_pages = ttm_dma_get_pages,
    .put_pages = ttm_dma_put_pages,
    .alloc_init = ttm_dma_page_alloc_init,
    .alloc_fini = ttm_dma_page_alloc_fini,
    .debugfs = ttm_dma_page_alloc_debugfs,
    +#ifdef CONFIG_X86
    + .set_caching = ttm_dma_page_set_page_caching,
    +#endif
    };
    --
    1.7.4.1


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