remoteproc: introduce rproc_find_carveout_by_name function

This patch provides a new function to find a carveout according
to a name.
If match found, this function returns a pointer on the corresponding
carveout (rproc_mem_entry structure).

Signed-off-by: Loic Pallardy <loic.pallardy@st.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index db771e5..800320d 100644 (file)
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -217,6 +217,48 @@ out:
 }
 EXPORT_SYMBOL(rproc_da_to_va);
 
+/**
+ * rproc_find_carveout_by_name() - lookup the carveout region by a name
+ * @rproc: handle of a remote processor
+ * @name,..: carveout name to find (standard printf format)
+ *
+ * Platform driver has the capability to register some pre-allacoted carveout
+ * (physically contiguous memory regions) before rproc firmware loading and
+ * associated resource table analysis. These regions may be dedicated memory
+ * regions internal to the coprocessor or specified DDR region with specific
+ * attributes
+ *
+ * This function is a helper function with which we can go over the
+ * allocated carveouts and return associated region characteristics like
+ * coprocessor address, length or processor virtual address.
+ *
+ * Return: a valid pointer on carveout entry on success or NULL on failure.
+ */
+struct rproc_mem_entry *
+rproc_find_carveout_by_name(struct rproc *rproc, const char *name, ...)
+{
+       va_list args;
+       char _name[32];
+       struct rproc_mem_entry *carveout, *mem = NULL;
+
+       if (!name)
+               return NULL;
+
+       va_start(args, name);
+       vsnprintf(_name, sizeof(_name), name, args);
+       va_end(args);
+
+       list_for_each_entry(carveout, &rproc->carveouts, node) {
+               /* Compare carveout and requested names */
+               if (!strcmp(carveout->name, _name)) {
+                       mem = carveout;
+                       break;
+               }
+       }
+
+       return mem;
+}
+
 int rproc_alloc_vring(struct rproc_vdev *rvdev, int i)
 {
        struct rproc *rproc = rvdev->rproc;