diff options
| author | Alexandre Courbot <acourbot@nvidia.com> | 2015-02-20 12:23:02 +0300 |
|---|---|---|
| committer | Ben Skeggs <bskeggs@redhat.com> | 2015-04-14 10:00:44 +0300 |
| commit | 5dc240bcfe9a8d30b151be58b174261ba388cb01 (patch) | |
| tree | 61637f05cba373da5ae3d14674fb33179984eabf /drivers/gpu/drm | |
| parent | 14520876751e1022704b58ce08e0dadc8c736656 (diff) | |
| download | linux-5dc240bcfe9a8d30b151be58b174261ba388cb01.tar.xz | |
drm/nouveau/instmem/gk20a: use DMA attributes
instmem for GK20A is allocated using dma_alloc_coherent(), which
provides us with a coherent CPU mapping that we never use because
instmem objects are accessed through PRAMIN. Switch to
dma_alloc_attrs() which gives us the option to dismiss that CPU mapping
and free up some CPU virtual space.
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Diffstat (limited to 'drivers/gpu/drm')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nvkm/subdev/instmem/gk20a.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/gk20a.c b/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/gk20a.c index 9a1fc8404ace..175ac187d382 100644 --- a/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/gk20a.c +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/gk20a.c @@ -24,6 +24,10 @@ #include <core/mm.h> #include <core/device.h> +#ifdef __KERNEL__ +#include <linux/dma-attrs.h> +#endif + #include "priv.h" struct gk20a_instobj_priv { @@ -41,6 +45,7 @@ struct gk20a_instmem_priv { struct nvkm_instmem base; spinlock_t lock; u64 addr; + struct dma_attrs attrs; }; static u32 @@ -91,8 +96,8 @@ gk20a_instobj_dtor(struct nvkm_object *object) if (unlikely(!node->handle)) return; - dma_free_coherent(dev, node->mem->size << PAGE_SHIFT, node->cpuaddr, - node->handle); + dma_free_attrs(dev, node->mem->size << PAGE_SHIFT, node->cpuaddr, + node->handle, &priv->attrs); nvkm_instobj_destroy(&node->base); } @@ -126,8 +131,9 @@ gk20a_instobj_ctor(struct nvkm_object *parent, struct nvkm_object *engine, node->mem = &node->_mem; - node->cpuaddr = dma_alloc_coherent(dev, npages << PAGE_SHIFT, - &node->handle, GFP_KERNEL); + node->cpuaddr = dma_alloc_attrs(dev, npages << PAGE_SHIFT, + &node->handle, GFP_KERNEL, + &priv->attrs); if (!node->cpuaddr) { nv_error(priv, "cannot allocate DMA memory\n"); return -ENOMEM; @@ -195,6 +201,16 @@ gk20a_instmem_ctor(struct nvkm_object *parent, struct nvkm_object *engine, spin_lock_init(&priv->lock); + init_dma_attrs(&priv->attrs); + /* + * We will access instmem through PRAMIN and thus do not need a + * consistent CPU pointer or kernel mapping + */ + dma_set_attr(DMA_ATTR_NON_CONSISTENT, &priv->attrs); + dma_set_attr(DMA_ATTR_WEAK_ORDERING, &priv->attrs); + dma_set_attr(DMA_ATTR_WRITE_COMBINE, &priv->attrs); + dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &priv->attrs); + return 0; } |