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remoteproc: create vdev subdevice with specific dma memory pool

Telusuri Sumber 
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>
This commit is contained in:
Loic Pallardy
2019-01-10 14:50:49 +01:00
committed by Bjorn Andersson
orang tua 621eafdb0f
melakukan 086d08725d
4 mengubah file dengan 87 tambahan dan 4 penghapusan
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42
drivers/remoteproc/remoteproc_virtio.c
Melihat File

@@ -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;