These functions replace a section of common code found
in radeon/amdgpu drivers (and possibly others) as part
of the ttm_tt_*populate() callbacks.
Signed-off-by: Tom St Denis <tom.stde...@amd.com>
---
drivers/gpu/drm/ttm/ttm_page_alloc.c | 41 ++++++++++++++++++++++++++++++++++++
include/drm/ttm/ttm_page_alloc.h | 11 ++++++++++
2 files changed, 52 insertions(+)
diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c
b/drivers/gpu/drm/ttm/ttm_page_alloc.c
index 871599826773..6a660d196d87 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c
@@ -920,6 +920,47 @@ void ttm_pool_unpopulate(struct ttm_tt *ttm)
}
EXPORT_SYMBOL(ttm_pool_unpopulate);
+int ttm_populate_and_map_pages(struct device *dev, struct ttm_dma_tt *tt)
+{
+ unsigned i;
+ int r;
+
+ r = ttm_pool_populate(&tt->ttm);
+ if (r)
+ return r;
+
+ for (i = 0; i < tt->ttm.num_pages; i++) {
+ tt->dma_address[i] = dma_map_page(dev, tt->ttm.pages[i],
+ 0, PAGE_SIZE,
+ DMA_BIDIRECTIONAL);
+ if (dma_mapping_error(dev, tt->dma_address[i])) {
+ while (i--) {
+ dma_unmap_page(dev, tt->dma_address[i],
+ PAGE_SIZE, DMA_BIDIRECTIONAL);
+ tt->dma_address[i] = 0;
+ }
+ ttm_pool_unpopulate(&tt->ttm);
+ return -EFAULT;
+ }
+ }
+ return 0;
+}
+EXPORT_SYMBOL(ttm_populate_and_map_pages);
+
+void ttm_unmap_and_unpopulate_pages(struct device *dev, struct ttm_dma_tt *tt)
+{
+ unsigned i;
+
+ for (i = 0; i < tt->ttm.num_pages; i++) {
+ if (tt->dma_address[i]) {
+ dma_unmap_page(dev, tt->dma_address[i],
+ PAGE_SIZE, DMA_BIDIRECTIONAL);
+ }
+ }
+ ttm_pool_unpopulate(&tt->ttm);
+}
+EXPORT_SYMBOL(ttm_unmap_and_unpopulate_pages);
+
int ttm_page_alloc_debugfs(struct seq_file *m, void *data)
{
struct ttm_page_pool *p;
diff --git a/include/drm/ttm/ttm_page_alloc.h b/include/drm/ttm/ttm_page_alloc.h
index 49a828425fa2..8695918ea629 100644
--- a/include/drm/ttm/ttm_page_alloc.h
+++ b/include/drm/ttm/ttm_page_alloc.h
@@ -83,6 +83,17 @@ extern int ttm_dma_page_alloc_debugfs(struct seq_file *m,
void *data);
extern int ttm_dma_populate(struct ttm_dma_tt *ttm_dma, struct device *dev);
extern void ttm_dma_unpopulate(struct ttm_dma_tt *ttm_dma, struct device *dev);
+
+/**
+ * Populates and DMA maps pages to fullfil a ttm_dma_populate() request
+ */
+int ttm_populate_and_map_pages(struct device *dev, struct ttm_dma_tt *tt);
+
+/**
+ * Unpopulates and DMA unmaps pages as part of a
+ * ttm_dma_unpopulate() request */
+void ttm_unmap_and_unpopulate_pages(struct device *dev, struct ttm_dma_tt *tt);
+
#else
static inline int ttm_dma_page_alloc_init(struct ttm_mem_global *glob,
unsigned max_pages)
--
2.12.0
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