[PATCH v4 03/17] remoteproc: add release ops in rproc_mem_entry struct

[Loic Pallardy]

Memory entry could be allocated in different ways (ioremap,
dma_alloc_coherent, internal RAM allocator...).
This patch introduces a release ops in rproc_mem_entry structure
to associate dedicated release mechanism to each memory entry descriptor
in order to keep remoteproc core generic.

Signed-off-by: Loic Pallardy <loic.palla...@st.com>
Acked-by: Bjorn Andersson <bjorn.anders...@linaro.org>
---
 drivers/remoteproc/remoteproc_core.c | 23 +++++++++++++++++++++--
 include/linux/remoteproc.h           |  5 ++++-
 2 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_core.c 
b/drivers/remoteproc/remoteproc_core.c
index 8e5fe1e..24fe11f 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -600,6 +600,24 @@ static int rproc_handle_devmem(struct rproc *rproc, struct 
fw_rsc_devmem *rsc,
 }
 
 /**
+ * rproc_release_carveout() - release acquired carveout
+ * @rproc: rproc handle
+ * @mem: the memory entry to release
+ *
+ * This function releases specified memory entry @mem allocated via
+ * dma_alloc_coherent() function by @rproc.
+ */
+static int rproc_release_carveout(struct rproc *rproc,
+                                 struct rproc_mem_entry *mem)
+{
+       struct device *dev = &rproc->dev;
+
+       /* clean up carveout allocations */
+       dma_free_coherent(dev->parent, mem->len, mem->va, mem->dma);
+       return 0;
+}
+
+/**
  * rproc_handle_carveout() - handle phys contig memory allocation requests
  * @rproc: rproc handle
  * @rsc: the resource entry
@@ -733,6 +751,7 @@ static int rproc_handle_carveout(struct rproc *rproc,
        carveout->len = rsc->len;
        carveout->dma = dma;
        carveout->da = rsc->da;
+       carveout->release = rproc_release_carveout;
 
        list_add_tail(&carveout->node, &rproc->carveouts);
 
@@ -920,8 +939,8 @@ static void rproc_resource_cleanup(struct rproc *rproc)
 
        /* clean up carveout allocations */
        list_for_each_entry_safe(entry, tmp, &rproc->carveouts, node) {
-               dma_free_coherent(dev->parent, entry->len, entry->va,
-                                 entry->dma);
+               if (entry->release)
+                       entry->release(rproc, entry);
                list_del(&entry->node);
                kfree(entry);
        }
diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index e3c5d85..bef2e83 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -305,12 +305,15 @@ struct fw_rsc_vdev {
        struct fw_rsc_vdev_vring vring[0];
 } __packed;
 
+struct rproc;
+
 /**
  * struct rproc_mem_entry - memory entry descriptor
  * @va:        virtual address
  * @dma: dma address
  * @len: length, in bytes
  * @da: device address
+ * @release: release associated memory
  * @priv: associated data
  * @node: list node
  */
@@ -321,9 +324,9 @@ struct rproc_mem_entry {
        u32 da;
        void *priv;
        struct list_head node;
+       int (*release)(struct rproc *rproc, struct rproc_mem_entry *mem);
 };
 
-struct rproc;
 struct firmware;
 
 /**
-- 
1.9.1