linux-kernel - [PATCH v3 07/13] remoteproc: introduce rproc_find_carveout_by

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Date:   Thu, 1 Mar 2018 17:23:54 +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>,
        Loic Pallardy <loic.pallardy@...com>
Subject: [PATCH v3 07/13] 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@...com>
---
 drivers/remoteproc/remoteproc_core.c | 43 ++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 91aa22b..7a500cb 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -216,6 +216,49 @@ void *rproc_da_to_va(struct rproc *rproc, u64 da, int len)
 }
 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.
+ *
+ * The function returns 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;
+
+	va_start(args, name);
+	snprintf(_name, sizeof(_name), name, args);
+	va_end(args);
+
+	if (!name)
+		return NULL;
+
+	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;
-- 
1.9.1