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Subject[PATCH 9/9] ttm/dma: Implement set_page_caching implementation in the TTM DMA pool code.
Date
. 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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