[coreboot-gerrit] Patch set updated for coreboot: region: add xlate_region_device
Aaron Durbin (adurbin@chromium.org)
gerrit at coreboot.org
Wed Oct 28 22:22:42 CET 2015
Aaron Durbin (adurbin at chromium.org) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/12227
-gerrit
commit 4e724aeb5d04bfe59f6624259247eae4eed096db
Author: Aaron Durbin <adurbin at chromium.org>
Date: Wed Oct 28 16:09:42 2015 -0500
region: add xlate_region_device
There are cases where one region_device needs to be
accessed using offset/sizes from one address space
that need the offset translated into a different
address space for operations to take place. The
xlate_region_device provides an offset that is
subtracted from the incoming transaction before
deferring to the backing access region.
Change-Id: I41d43924bb6fbc7b4d3681877543209e1085e15c
Signed-off-by: Aaron Durbin <adurbin at chromium.org>
---
src/commonlib/include/commonlib/region.h | 22 ++++++++++++++++++++
src/commonlib/region.c | 35 ++++++++++++++++++++++++++++++++
2 files changed, 57 insertions(+)
diff --git a/src/commonlib/include/commonlib/region.h b/src/commonlib/include/commonlib/region.h
index d3e7ebd..e52fb93 100644
--- a/src/commonlib/include/commonlib/region.h
+++ b/src/commonlib/include/commonlib/region.h
@@ -154,4 +154,26 @@ void mmap_helper_device_init(struct mmap_helper_region_device *mdev,
void *mmap_helper_rdev_mmap(const struct region_device *, size_t, size_t);
int mmap_helper_rdev_munmap(const struct region_device *, void *);
+/* A translated region device provides the ability to publish a region device
+ * in on address space and use an access mechansim within another address
+ * space. The offset is peeled from the incoming transaction before
+ * utilizing the backing access_dev. */
+struct xlate_region_device {
+ const struct region_device *access_dev;
+ size_t offset;
+ struct region_device rdev;
+};
+
+extern const struct region_device_ops xlate_rdev_ops;
+
+#define XLATE_REGION_INIT_OFF(access_dev_, xlate_offset_, offset_, size_) \
+ { \
+ .access_dev = access_dev_, \
+ .offset = xlate_offset_, \
+ .rdev = REGION_DEV_INIT(&xlate_rdev_ops, (offset_), (size_)),\
+ }
+
+#define XLATE_REGION_INIT(access_dev_, offset_, size_) \
+ XLATE_REGION_INIT_OFF((access_dev_, (offset_), (offset_), (size_)
+
#endif /* _REGION_H_ */
diff --git a/src/commonlib/region.c b/src/commonlib/region.c
index 352f92e..fc87880 100644
--- a/src/commonlib/region.c
+++ b/src/commonlib/region.c
@@ -194,3 +194,38 @@ int mmap_helper_rdev_munmap(const struct region_device *rd, void *mapping)
return 0;
}
+
+static void *xlate_mmap(const struct region_device *rd, size_t offset,
+ size_t size)
+{
+ const struct xlate_region_device *xldev;
+
+ xldev = container_of(rd, typeof(*xldev), rdev);
+
+ return rdev_mmap(xldev->access_dev, offset - xldev->offset, size);
+}
+
+static int xlate_munmap(const struct region_device *rd, void *mapping)
+{
+ const struct xlate_region_device *xldev;
+
+ xldev = container_of(rd, typeof(*xldev), rdev);
+
+ return rdev_munmap(xldev->access_dev, mapping);
+}
+
+static ssize_t xlate_readat(const struct region_device *rd, void *b,
+ size_t offset, size_t size)
+{
+ const struct xlate_region_device *xldev;
+
+ xldev = container_of(rd, typeof(*xldev), rdev);
+
+ return rdev_readat(xldev->access_dev, b, offset - xldev->offset, size);
+}
+
+const struct region_device_ops xlate_rdev_ops = {
+ .mmap = xlate_mmap,
+ .munmap = xlate_munmap,
+ .readat = xlate_readat,
+};
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