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authorLoic Pallardy <loic.pallardy@st.com>2019-01-10 16:50:49 +0300
committerBjorn Andersson <bjorn.andersson@linaro.org>2019-02-21 08:15:35 +0300
commit086d08725d34c6b3333db710344ae9c4fdafb2d5 (patch)
tree6e68e3ed2fecc9c456c55b150f34aef1058aba3f /drivers/remoteproc/remoteproc_virtio.c
parent621eafdb0f0dbb46b8ba9c12dbf566a49f07363d (diff)
downloadlinux-086d08725d34c6b3333db710344ae9c4fdafb2d5.tar.xz
remoteproc: create vdev subdevice with specific dma memory pool
This patch creates a dedicated vdev subdevice for each vdev declared in firmware resource table and associates carveout named "vdev%dbuffer" (with %d vdev index in resource table) if any as dma coherent memory pool. Then vdev subdevice is used as parent for virtio device. Signed-off-by: Loic Pallardy <loic.pallardy@st.com> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Diffstat (limited to 'drivers/remoteproc/remoteproc_virtio.c')
-rw-r--r--drivers/remoteproc/remoteproc_virtio.c42
1 files changed, 41 insertions, 1 deletions
diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
index 183fc42a510a..d08b2cfd875b 100644
--- a/drivers/remoteproc/remoteproc_virtio.c
+++ b/drivers/remoteproc/remoteproc_virtio.c
@@ -17,7 +17,9 @@
* GNU General Public License for more details.
*/
+#include <linux/dma-mapping.h>
#include <linux/export.h>
+#include <linux/of_reserved_mem.h>
#include <linux/remoteproc.h>
#include <linux/virtio.h>
#include <linux/virtio_config.h>
@@ -328,10 +330,48 @@ static void rproc_virtio_dev_release(struct device *dev)
int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
{
struct rproc *rproc = rvdev->rproc;
- struct device *dev = &rproc->dev;
+ struct device *dev = &rvdev->dev;
struct virtio_device *vdev = &rvdev->vdev;
+ struct rproc_mem_entry *mem;
int ret;
+ /* Try to find dedicated vdev buffer carveout */
+ mem = rproc_find_carveout_by_name(rproc, "vdev%dbuffer", rvdev->index);
+ if (mem) {
+ phys_addr_t pa;
+
+ if (mem->of_resm_idx != -1) {
+ struct device_node *np = rproc->dev.parent->of_node;
+
+ /* Associate reserved memory to vdev device */
+ ret = of_reserved_mem_device_init_by_idx(dev, np,
+ mem->of_resm_idx);
+ if (ret) {
+ dev_err(dev, "Can't associate reserved memory\n");
+ goto out;
+ }
+ } else {
+ if (mem->va) {
+ dev_warn(dev, "vdev %d buffer already mapped\n",
+ rvdev->index);
+ pa = rproc_va_to_pa(mem->va);
+ } else {
+ /* Use dma address as carveout no memmapped yet */
+ pa = (phys_addr_t)mem->dma;
+ }
+
+ /* Associate vdev buffer memory pool to vdev subdev */
+ ret = dma_declare_coherent_memory(dev, pa,
+ mem->da,
+ mem->len,
+ DMA_MEMORY_EXCLUSIVE);
+ if (ret < 0) {
+ dev_err(dev, "Failed to associate buffer\n");
+ goto out;
+ }
+ }
+ }
+
vdev->id.device = id,
vdev->config = &rproc_virtio_config_ops,
vdev->dev.parent = dev;