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@@ -0,0 +1,163 @@
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+
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+#include "drmP.h"
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+#include "drm.h"
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+
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+#include "nouveau_drv.h"
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+#include "nouveau_drm.h"
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+#include "nouveau_dma.h"
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+
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+#include <linux/dma-buf.h>
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+
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+static struct sg_table *nouveau_gem_map_dma_buf(struct dma_buf_attachment *attachment,
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+ enum dma_data_direction dir)
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+{
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+ struct nouveau_bo *nvbo = attachment->dmabuf->priv;
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+ struct drm_device *dev = nvbo->gem->dev;
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+ int npages = nvbo->bo.num_pages;
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+ struct sg_table *sg;
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+ int nents;
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+
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+ mutex_lock(&dev->struct_mutex);
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+ sg = drm_prime_pages_to_sg(nvbo->bo.ttm->pages, npages);
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+ nents = dma_map_sg(attachment->dev, sg->sgl, sg->nents, dir);
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+ mutex_unlock(&dev->struct_mutex);
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+ return sg;
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+}
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+
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+static void nouveau_gem_unmap_dma_buf(struct dma_buf_attachment *attachment,
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+ struct sg_table *sg, enum dma_data_direction dir)
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+{
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+ dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir);
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+ sg_free_table(sg);
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+ kfree(sg);
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+}
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+
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+static void nouveau_gem_dmabuf_release(struct dma_buf *dma_buf)
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+{
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+ struct nouveau_bo *nvbo = dma_buf->priv;
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+
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+ if (nvbo->gem->export_dma_buf == dma_buf) {
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+ nvbo->gem->export_dma_buf = NULL;
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+ drm_gem_object_unreference_unlocked(nvbo->gem);
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+ }
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+}
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+
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+static void *nouveau_gem_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num)
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+{
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+ return NULL;
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+}
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+
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+static void nouveau_gem_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
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+{
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+
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+}
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+static void *nouveau_gem_kmap(struct dma_buf *dma_buf, unsigned long page_num)
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+{
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+ return NULL;
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+}
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+
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+static void nouveau_gem_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
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+{
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+
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+}
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+
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+struct dma_buf_ops nouveau_dmabuf_ops = {
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+ .map_dma_buf = nouveau_gem_map_dma_buf,
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+ .unmap_dma_buf = nouveau_gem_unmap_dma_buf,
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+ .release = nouveau_gem_dmabuf_release,
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+ .kmap = nouveau_gem_kmap,
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+ .kmap_atomic = nouveau_gem_kmap_atomic,
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+ .kunmap = nouveau_gem_kunmap,
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+ .kunmap_atomic = nouveau_gem_kunmap_atomic,
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+};
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+
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+static int
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+nouveau_prime_new(struct drm_device *dev,
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+ size_t size,
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+ struct sg_table *sg,
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+ struct nouveau_bo **pnvbo)
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+{
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+ struct nouveau_bo *nvbo;
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+ u32 flags = 0;
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+ int ret;
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+
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+ flags = TTM_PL_FLAG_TT;
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+
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+ ret = nouveau_bo_new(dev, size, 0, flags, 0, 0,
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+ sg, pnvbo);
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+ if (ret)
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+ return ret;
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+ nvbo = *pnvbo;
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+
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+ /* we restrict allowed domains on nv50+ to only the types
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+ * that were requested at creation time. not possibly on
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+ * earlier chips without busting the ABI.
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+ */
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+ nvbo->valid_domains = NOUVEAU_GEM_DOMAIN_GART;
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+ nvbo->gem = drm_gem_object_alloc(dev, nvbo->bo.mem.size);
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+ if (!nvbo->gem) {
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+ nouveau_bo_ref(NULL, pnvbo);
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+ return -ENOMEM;
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+ }
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+
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+ nvbo->gem->driver_private = nvbo;
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+ return 0;
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+}
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+
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+struct dma_buf *nouveau_gem_prime_export(struct drm_device *dev,
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+ struct drm_gem_object *obj, int flags)
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+{
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+ struct nouveau_bo *nvbo = nouveau_gem_object(obj);
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+ int ret = 0;
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+
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+ /* pin buffer into GTT */
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+ ret = nouveau_bo_pin(nvbo, TTM_PL_FLAG_TT);
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+ if (ret)
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+ return ERR_PTR(-EINVAL);
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+
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+ return dma_buf_export(nvbo, &nouveau_dmabuf_ops, obj->size, flags);
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+}
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+
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+struct drm_gem_object *nouveau_gem_prime_import(struct drm_device *dev,
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+ struct dma_buf *dma_buf)
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+{
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+ struct dma_buf_attachment *attach;
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+ struct sg_table *sg;
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+ struct nouveau_bo *nvbo;
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+ int ret;
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+
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+ if (dma_buf->ops == &nouveau_dmabuf_ops) {
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+ nvbo = dma_buf->priv;
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+ if (nvbo->gem) {
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+ if (nvbo->gem->dev == dev) {
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+ drm_gem_object_reference(nvbo->gem);
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+ return nvbo->gem;
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+ }
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+ }
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+ }
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+ /* need to attach */
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+ attach = dma_buf_attach(dma_buf, dev->dev);
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+ if (IS_ERR(attach))
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+ return ERR_PTR(PTR_ERR(attach));
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+
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+ sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
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+ if (IS_ERR(sg)) {
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+ ret = PTR_ERR(sg);
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+ goto fail_detach;
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+ }
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+
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+ ret = nouveau_prime_new(dev, dma_buf->size, sg, &nvbo);
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+ if (ret)
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+ goto fail_unmap;
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+
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+ nvbo->gem->import_attach = attach;
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+
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+ return nvbo->gem;
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+
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+fail_unmap:
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+ dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL);
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+fail_detach:
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+ dma_buf_detach(dma_buf, attach);
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+ return ERR_PTR(ret);
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+}
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+
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