[PATCH 3/5] drm/i915: Implement __for_each_sgt_daddr_next
Nirmoy Das
nirmoy.das at intel.com
Tue Sep 5 06:09:02 UTC 2023
Implement a way to iterate over sgt with pre-initialized
sgt_iter state.
Signed-off-by: Nirmoy Das <nirmoy.das at intel.com>
---
drivers/gpu/drm/i915/i915_scatterlist.h | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_scatterlist.h b/drivers/gpu/drm/i915/i915_scatterlist.h
index 5a10c1a31183..2a6f318e1de7 100644
--- a/drivers/gpu/drm/i915/i915_scatterlist.h
+++ b/drivers/gpu/drm/i915/i915_scatterlist.h
@@ -91,6 +91,16 @@ static inline struct scatterlist *__sg_next(struct scatterlist *sg)
((__dp) = (__iter).dma + (__iter).curr), (__iter).sgp; \
(((__iter).curr += (__step)) >= (__iter).max) ? \
(__iter) = __sgt_iter(__sg_next((__iter).sgp), true), 0 : 0)
+/**
+ * __for_each_daddr_next - iterates over the device addresses with pre-initialized iterator.
+ * @__dp: Device address (output)
+ * @__iter: 'struct sgt_iter' (iterator state, external)
+ * @__step: step size
+ */
+#define __for_each_daddr_next(__dp, __iter, __step) \
+ for (; ((__dp) = (__iter).dma + (__iter).curr), (__iter).sgp; \
+ (((__iter).curr += (__step)) >= (__iter).max) ? \
+ (__iter) = __sgt_iter(__sg_next((__iter).sgp), true), 0 : 0)
/**
* for_each_sgt_page - iterate over the pages of the given sg_table
--
2.41.0
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