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Date: Thu, 10 Jan 2019 14:50:49 +0100
From: Loic Pallardy <loic.pallardy@...com>
To: <bjorn.andersson@...aro.org>, <ohad@...ery.com>
CC: <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<arnaud.pouliquen@...com>, <benjamin.gaignard@...aro.org>,
<s-anna@...com>, Loic Pallardy <loic.pallardy@...com>
Subject: [PATCH v2 1/3] 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@...com>
---
Changes from v1:
- rebase on v5.0-rc1 (dma_declare_coherent_memory() API change)
- call put_device() in case of error returned by device_register()
---
drivers/remoteproc/remoteproc_core.c | 47 ++++++++++++++++++++++++++++++--
drivers/remoteproc/remoteproc_internal.h | 1 +
drivers/remoteproc/remoteproc_virtio.c | 42 +++++++++++++++++++++++++++-
include/linux/remoteproc.h | 1 +
4 files changed, 87 insertions(+), 4 deletions(-)
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 54ec38fc5dca..821dbedef18e 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -39,9 +39,11 @@
#include <linux/idr.h>
#include <linux/elf.h>
#include <linux/crc32.h>
+#include <linux/of_reserved_mem.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_ring.h>
#include <asm/byteorder.h>
+#include <linux/platform_device.h>
#include "remoteproc_internal.h"
@@ -145,7 +147,7 @@ static void rproc_disable_iommu(struct rproc *rproc)
iommu_domain_free(domain);
}
-static phys_addr_t rproc_va_to_pa(void *cpu_addr)
+phys_addr_t rproc_va_to_pa(void *cpu_addr)
{
/*
* Return physical address according to virtual address location
@@ -160,6 +162,7 @@ static phys_addr_t rproc_va_to_pa(void *cpu_addr)
WARN_ON(!virt_addr_valid(cpu_addr));
return virt_to_phys(cpu_addr);
}
+EXPORT_SYMBOL(rproc_va_to_pa);
/**
* rproc_da_to_va() - lookup the kernel virtual address for a remoteproc address
@@ -423,6 +426,20 @@ static void rproc_vdev_do_stop(struct rproc_subdev *subdev, bool crashed)
}
/**
+ * rproc_rvdev_release() - release the existence of a rvdev
+ *
+ * @dev: the subdevice's dev
+ */
+static void rproc_rvdev_release(struct device *dev)
+{
+ struct rproc_vdev *rvdev = container_of(dev, struct rproc_vdev, dev);
+
+ of_reserved_mem_device_release(dev);
+
+ kfree(rvdev);
+}
+
+/**
* rproc_handle_vdev() - handle a vdev fw resource
* @rproc: the remote processor
* @rsc: the vring resource descriptor
@@ -455,6 +472,7 @@ static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc,
struct device *dev = &rproc->dev;
struct rproc_vdev *rvdev;
int i, ret;
+ char name[16];
/* make sure resource isn't truncated */
if (sizeof(*rsc) + rsc->num_of_vrings * sizeof(struct fw_rsc_vdev_vring)
@@ -488,6 +506,29 @@ static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc,
rvdev->rproc = rproc;
rvdev->index = rproc->nb_vdev++;
+ /* Initialise vdev subdevice */
+ snprintf(name, sizeof(name), "vdev%dbuffer", rvdev->index);
+ rvdev->dev.parent = rproc->dev.parent;
+ rvdev->dev.release = rproc_rvdev_release;
+ dev_set_name(&rvdev->dev, "%s#%s", dev_name(rvdev->dev.parent), name);
+ dev_set_drvdata(&rvdev->dev, rvdev);
+
+ ret = device_register(&rvdev->dev);
+ if (ret) {
+ put_device(&rvdev->dev);
+ return ret;
+ }
+ /* Make device dma capable by inheriting from parent's capabilities */
+ set_dma_ops(&rvdev->dev, get_dma_ops(rproc->dev.parent));
+
+ ret = dma_coerce_mask_and_coherent(&rvdev->dev,
+ dma_get_mask(rproc->dev.parent));
+ if (ret) {
+ dev_warn(dev,
+ "Failed to set DMA mask %llx. Trying to continue... %x\n",
+ dma_get_mask(rproc->dev.parent), ret);
+ }
+
/* parse the vrings */
for (i = 0; i < rsc->num_of_vrings; i++) {
ret = rproc_parse_vring(rvdev, rsc, i);
@@ -518,7 +559,7 @@ static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc,
for (i--; i >= 0; i--)
rproc_free_vring(&rvdev->vring[i]);
free_rvdev:
- kfree(rvdev);
+ device_unregister(&rvdev->dev);
return ret;
}
@@ -536,7 +577,7 @@ void rproc_vdev_release(struct kref *ref)
rproc_remove_subdev(rproc, &rvdev->subdev);
list_del(&rvdev->node);
- kfree(rvdev);
+ device_unregister(&rvdev->dev);
}
/**
diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
index f6cad243d7ca..bfeacfd40947 100644
--- a/drivers/remoteproc/remoteproc_internal.h
+++ b/drivers/remoteproc/remoteproc_internal.h
@@ -52,6 +52,7 @@ void rproc_free_vring(struct rproc_vring *rvring);
int rproc_alloc_vring(struct rproc_vdev *rvdev, int i);
void *rproc_da_to_va(struct rproc *rproc, u64 da, int len);
+phys_addr_t rproc_va_to_pa(void *cpu_addr);
int rproc_trigger_recovery(struct rproc *rproc);
int rproc_elf_sanity_check(struct rproc *rproc, const struct firmware *fw);
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;
diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index 507a2b524208..beecd8cf2eb5 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -554,6 +554,7 @@ struct rproc_vdev {
struct kref refcount;
struct rproc_subdev subdev;
+ struct device dev;
unsigned int id;
struct list_head node;
--
2.7.4
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