nouveau: add PRIME support
This adds prime->fd and fd->prime support to nouveau,
it passes the SG object to TTM, and then populates the
GART entries using it.
v2: add stubbed kmap + use new function to fill out pages array
for faulting + add reimport test.
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_prime.c b/drivers/gpu/drm/nouveau/nouveau_prime.c
new file mode 100644
index 0000000..ed6b846
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nouveau_prime.c
@@ -0,0 +1,163 @@
+
+#include "drmP.h"
+#include "drm.h"
+
+#include "nouveau_drv.h"
+#include "nouveau_drm.h"
+#include "nouveau_dma.h"
+
+#include <linux/dma-buf.h>
+
+static struct sg_table *nouveau_gem_map_dma_buf(struct dma_buf_attachment *attachment,
+ enum dma_data_direction dir)
+{
+ struct nouveau_bo *nvbo = attachment->dmabuf->priv;
+ struct drm_device *dev = nvbo->gem->dev;
+ int npages = nvbo->bo.num_pages;
+ struct sg_table *sg;
+ int nents;
+
+ mutex_lock(&dev->struct_mutex);
+ sg = drm_prime_pages_to_sg(nvbo->bo.ttm->pages, npages);
+ nents = dma_map_sg(attachment->dev, sg->sgl, sg->nents, dir);
+ mutex_unlock(&dev->struct_mutex);
+ return sg;
+}
+
+static void nouveau_gem_unmap_dma_buf(struct dma_buf_attachment *attachment,
+ struct sg_table *sg, enum dma_data_direction dir)
+{
+ dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir);
+ sg_free_table(sg);
+ kfree(sg);
+}
+
+static void nouveau_gem_dmabuf_release(struct dma_buf *dma_buf)
+{
+ struct nouveau_bo *nvbo = dma_buf->priv;
+
+ if (nvbo->gem->export_dma_buf == dma_buf) {
+ nvbo->gem->export_dma_buf = NULL;
+ drm_gem_object_unreference_unlocked(nvbo->gem);
+ }
+}
+
+static void *nouveau_gem_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num)
+{
+ return NULL;
+}
+
+static void nouveau_gem_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
+{
+
+}
+static void *nouveau_gem_kmap(struct dma_buf *dma_buf, unsigned long page_num)
+{
+ return NULL;
+}
+
+static void nouveau_gem_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
+{
+
+}
+
+struct dma_buf_ops nouveau_dmabuf_ops = {
+ .map_dma_buf = nouveau_gem_map_dma_buf,
+ .unmap_dma_buf = nouveau_gem_unmap_dma_buf,
+ .release = nouveau_gem_dmabuf_release,
+ .kmap = nouveau_gem_kmap,
+ .kmap_atomic = nouveau_gem_kmap_atomic,
+ .kunmap = nouveau_gem_kunmap,
+ .kunmap_atomic = nouveau_gem_kunmap_atomic,
+};
+
+static int
+nouveau_prime_new(struct drm_device *dev,
+ size_t size,
+ struct sg_table *sg,
+ struct nouveau_bo **pnvbo)
+{
+ struct nouveau_bo *nvbo;
+ u32 flags = 0;
+ int ret;
+
+ flags = TTM_PL_FLAG_TT;
+
+ ret = nouveau_bo_new(dev, size, 0, flags, 0, 0,
+ sg, pnvbo);
+ if (ret)
+ return ret;
+ nvbo = *pnvbo;
+
+ /* we restrict allowed domains on nv50+ to only the types
+ * that were requested at creation time. not possibly on
+ * earlier chips without busting the ABI.
+ */
+ nvbo->valid_domains = NOUVEAU_GEM_DOMAIN_GART;
+ nvbo->gem = drm_gem_object_alloc(dev, nvbo->bo.mem.size);
+ if (!nvbo->gem) {
+ nouveau_bo_ref(NULL, pnvbo);
+ return -ENOMEM;
+ }
+
+ nvbo->gem->driver_private = nvbo;
+ return 0;
+}
+
+struct dma_buf *nouveau_gem_prime_export(struct drm_device *dev,
+ struct drm_gem_object *obj, int flags)
+{
+ struct nouveau_bo *nvbo = nouveau_gem_object(obj);
+ int ret = 0;
+
+ /* pin buffer into GTT */
+ ret = nouveau_bo_pin(nvbo, TTM_PL_FLAG_TT);
+ if (ret)
+ return ERR_PTR(-EINVAL);
+
+ return dma_buf_export(nvbo, &nouveau_dmabuf_ops, obj->size, flags);
+}
+
+struct drm_gem_object *nouveau_gem_prime_import(struct drm_device *dev,
+ struct dma_buf *dma_buf)
+{
+ struct dma_buf_attachment *attach;
+ struct sg_table *sg;
+ struct nouveau_bo *nvbo;
+ int ret;
+
+ if (dma_buf->ops == &nouveau_dmabuf_ops) {
+ nvbo = dma_buf->priv;
+ if (nvbo->gem) {
+ if (nvbo->gem->dev == dev) {
+ drm_gem_object_reference(nvbo->gem);
+ return nvbo->gem;
+ }
+ }
+ }
+ /* need to attach */
+ attach = dma_buf_attach(dma_buf, dev->dev);
+ if (IS_ERR(attach))
+ return ERR_PTR(PTR_ERR(attach));
+
+ sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
+ if (IS_ERR(sg)) {
+ ret = PTR_ERR(sg);
+ goto fail_detach;
+ }
+
+ ret = nouveau_prime_new(dev, dma_buf->size, sg, &nvbo);
+ if (ret)
+ goto fail_unmap;
+
+ nvbo->gem->import_attach = attach;
+
+ return nvbo->gem;
+
+fail_unmap:
+ dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL);
+fail_detach:
+ dma_buf_detach(dma_buf, attach);
+ return ERR_PTR(ret);
+}
+