#include <drm/drmP.h>
#include <drm/drm_gem.h>
#include <drm/drm_vma_manager.h>
+#include <linux/iommu.h>
#include "rockchip_drm_drv.h"
#include "rockchip_drm_gem.h"
-static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,
+static int rockchip_gem_iommu_map(struct rockchip_gem_object *rk_obj)
+{
+ struct drm_device *drm = rk_obj->base.dev;
+ struct rockchip_drm_private *private = drm->dev_private;
+ int prot = IOMMU_READ | IOMMU_WRITE;
+ ssize_t ret;
+
+ mutex_lock(&private->mm_lock);
+
+ ret = drm_mm_insert_node_generic(&private->mm, &rk_obj->mm,
+ rk_obj->base.size, PAGE_SIZE,
+ 0, 0);
+
+ mutex_unlock(&private->mm_lock);
+ if (ret < 0) {
+ DRM_ERROR("out of I/O virtual memory: %zd\n", ret);
+ return ret;
+ }
+
+ rk_obj->dma_addr = rk_obj->mm.start;
+
+ ret = iommu_map_sg(private->domain, rk_obj->dma_addr, rk_obj->sgt->sgl,
+ rk_obj->sgt->nents, prot);
+ if (ret < rk_obj->base.size) {
+ DRM_ERROR("failed to map buffer: size=%zd request_size=%zd\n",
+ ret, rk_obj->base.size);
+ ret = -ENOMEM;
+ goto err_remove_node;
+ }
+
+ rk_obj->size = ret;
+
+ return 0;
+
+err_remove_node:
+ drm_mm_remove_node(&rk_obj->mm);
+
+ return ret;
+}
+
+static int rockchip_gem_iommu_unmap(struct rockchip_gem_object *rk_obj)
+{
+ struct drm_device *drm = rk_obj->base.dev;
+ struct rockchip_drm_private *private = drm->dev_private;
+
+ iommu_unmap(private->domain, rk_obj->dma_addr, rk_obj->size);
+
+ mutex_lock(&private->mm_lock);
+
+ drm_mm_remove_node(&rk_obj->mm);
+
+ mutex_unlock(&private->mm_lock);
+
+ return 0;
+}
+
+static int rockchip_gem_get_pages(struct rockchip_gem_object *rk_obj)
+{
+ struct drm_device *drm = rk_obj->base.dev;
+ int ret, i;
+ struct scatterlist *s;
+
+ rk_obj->pages = drm_gem_get_pages(&rk_obj->base);
+ if (IS_ERR(rk_obj->pages))
+ return PTR_ERR(rk_obj->pages);
+
+ rk_obj->num_pages = rk_obj->base.size >> PAGE_SHIFT;
+
+ rk_obj->sgt = drm_prime_pages_to_sg(rk_obj->pages, rk_obj->num_pages);
+ if (IS_ERR(rk_obj->sgt)) {
+ ret = PTR_ERR(rk_obj->sgt);
+ goto err_put_pages;
+ }
+
+ /*
+ * Fake up the SG table so that dma_sync_sg_for_device() can be used
+ * to flush the pages associated with it.
+ *
+ * TODO: Replace this by drm_clflush_sg() once it can be implemented
+ * without relying on symbols that are not exported.
+ */
+ for_each_sg(rk_obj->sgt->sgl, s, rk_obj->sgt->nents, i)
+ sg_dma_address(s) = sg_phys(s);
+
+ dma_sync_sg_for_device(drm->dev, rk_obj->sgt->sgl, rk_obj->sgt->nents,
+ DMA_TO_DEVICE);
+
+ return 0;
+
+err_put_pages:
+ drm_gem_put_pages(&rk_obj->base, rk_obj->pages, false, false);
+ return ret;
+}
+
+static void rockchip_gem_put_pages(struct rockchip_gem_object *rk_obj)
+{
+ sg_free_table(rk_obj->sgt);
+ kfree(rk_obj->sgt);
+ drm_gem_put_pages(&rk_obj->base, rk_obj->pages, true, true);
+}
+
+static int rockchip_gem_alloc_iommu(struct rockchip_gem_object *rk_obj,
+ bool alloc_kmap)
+{
+ int ret;
+
+ ret = rockchip_gem_get_pages(rk_obj);
+ if (ret < 0)
+ return ret;
+
+ ret = rockchip_gem_iommu_map(rk_obj);
+ if (ret < 0)
+ goto err_free;
+
+ if (alloc_kmap) {
+ rk_obj->kvaddr = vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
+ pgprot_writecombine(PAGE_KERNEL));
+ if (!rk_obj->kvaddr) {
+ DRM_ERROR("failed to vmap() buffer\n");
+ ret = -ENOMEM;
+ goto err_unmap;
+ }
+ }
+
+ return 0;
+
+err_unmap:
+ rockchip_gem_iommu_unmap(rk_obj);
+err_free:
+ rockchip_gem_put_pages(rk_obj);
+
+ return ret;
+}
+
+static int rockchip_gem_alloc_dma(struct rockchip_gem_object *rk_obj,
bool alloc_kmap)
{
struct drm_gem_object *obj = &rk_obj->base;
return 0;
}
-static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
+static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,
+ bool alloc_kmap)
+{
+ struct drm_gem_object *obj = &rk_obj->base;
+ struct drm_device *drm = obj->dev;
+ struct rockchip_drm_private *private = drm->dev_private;
+
+ if (private->domain)
+ return rockchip_gem_alloc_iommu(rk_obj, alloc_kmap);
+ else
+ return rockchip_gem_alloc_dma(rk_obj, alloc_kmap);
+}
+
+static void rockchip_gem_free_iommu(struct rockchip_gem_object *rk_obj)
+{
+ vunmap(rk_obj->kvaddr);
+ rockchip_gem_iommu_unmap(rk_obj);
+ rockchip_gem_put_pages(rk_obj);
+}
+
+static void rockchip_gem_free_dma(struct rockchip_gem_object *rk_obj)
{
struct drm_gem_object *obj = &rk_obj->base;
struct drm_device *drm = obj->dev;
rk_obj->dma_attrs);
}
-static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
- struct vm_area_struct *vma)
+static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
+{
+ if (rk_obj->pages)
+ rockchip_gem_free_iommu(rk_obj);
+ else
+ rockchip_gem_free_dma(rk_obj);
+}
+static int rockchip_drm_gem_object_mmap_iommu(struct drm_gem_object *obj,
+ struct vm_area_struct *vma)
{
+ struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
+ unsigned int i, count = obj->size >> PAGE_SHIFT;
+ unsigned long user_count = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
+ unsigned long uaddr = vma->vm_start;
+ unsigned long offset = vma->vm_pgoff;
+ unsigned long end = user_count + offset;
int ret;
+
+ if (user_count == 0)
+ return -ENXIO;
+ if (end > count)
+ return -ENXIO;
+
+ for (i = offset; i < end; i++) {
+ ret = vm_insert_page(vma, uaddr, rk_obj->pages[i]);
+ if (ret)
+ return ret;
+ uaddr += PAGE_SIZE;
+ }
+
+ return 0;
+}
+
+static int rockchip_drm_gem_object_mmap_dma(struct drm_gem_object *obj,
+ struct vm_area_struct *vma)
+{
struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
struct drm_device *drm = obj->dev;
+ return dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
+ obj->size, rk_obj->dma_attrs);
+}
+
+static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
+ struct vm_area_struct *vma)
+{
+ int ret;
+ struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
+
/*
- * dma_alloc_attrs() allocated a struct page table for rk_obj, so clear
+ * We allocated a struct page table for rk_obj, so clear
* VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
*/
vma->vm_flags &= ~VM_PFNMAP;
vma->vm_pgoff = 0;
- ret = dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
- obj->size, rk_obj->dma_attrs);
+ if (rk_obj->pages)
+ ret = rockchip_drm_gem_object_mmap_iommu(obj, vma);
+ else
+ ret = rockchip_drm_gem_object_mmap_dma(obj, vma);
+
if (ret)
drm_gem_vm_close(vma);
return rockchip_drm_gem_object_mmap(obj, vma);
}
+static void rockchip_gem_release_object(struct rockchip_gem_object *rk_obj)
+{
+ drm_gem_object_release(&rk_obj->base);
+ kfree(rk_obj);
+}
+
struct rockchip_gem_object *
rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
bool alloc_kmap)
obj = &rk_obj->base;
- drm_gem_private_object_init(drm, obj, size);
+ drm_gem_object_init(drm, obj, size);
ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
if (ret)
return rk_obj;
err_free_rk_obj:
- kfree(rk_obj);
+ rockchip_gem_release_object(rk_obj);
return ERR_PTR(ret);
}
{
struct rockchip_gem_object *rk_obj;
- drm_gem_free_mmap_offset(obj);
-
rk_obj = to_rockchip_obj(obj);
rockchip_gem_free_buf(rk_obj);
- kfree(rk_obj);
+ rockchip_gem_release_object(rk_obj);
}
/*
struct sg_table *sgt;
int ret;
+ if (rk_obj->pages)
+ return drm_prime_pages_to_sg(rk_obj->pages, rk_obj->num_pages);
+
sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
if (!sgt)
return ERR_PTR(-ENOMEM);
{
struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
+ if (rk_obj->pages)
+ return vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
+ pgprot_writecombine(PAGE_KERNEL));
+
if (rk_obj->dma_attrs & DMA_ATTR_NO_KERNEL_MAPPING)
return NULL;
void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
{
- /* Nothing to do */
+ struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
+
+ if (rk_obj->pages) {
+ vunmap(vaddr);
+ return;
+ }
+
+ /* Nothing to do if allocated by DMA mapping API. */
}
projects / karo-tx-linux.git / blobdiff