linux-kernel - [PATCH 09/19] dma-buf-map: Add wrapper over memset

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Message-Id: <20220126203702.1784589-10-lucas.demarchi@intel.com>
Date:   Wed, 26 Jan 2022 12:36:52 -0800
From:   Lucas De Marchi <lucas.demarchi@...el.com>
To:     intel-gfx@...ts.freedesktop.org
Cc:     dri-devel@...ts.freedesktop.org,
        Matt Roper <matthew.d.roper@...el.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        linux-media@...r.kernel.org, linaro-mm-sig@...ts.linaro.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 09/19] dma-buf-map: Add wrapper over memset

Just like memcpy_toio(), there is also need to write a direct value to a
memory block. Add dma_buf_map_memset() to abstract memset() vs memset_io()

Cc: Matt Roper <matthew.d.roper@...el.com>
Cc: Sumit Semwal <sumit.semwal@...aro.org>
Cc: Christian König <christian.koenig@....com>
Cc: linux-media@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org
Cc: linaro-mm-sig@...ts.linaro.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Lucas De Marchi <lucas.demarchi@...el.com>
---
 include/linux/dma-buf-map.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/include/linux/dma-buf-map.h b/include/linux/dma-buf-map.h
index 3514a859f628..c9fb04264cd0 100644
--- a/include/linux/dma-buf-map.h
+++ b/include/linux/dma-buf-map.h
@@ -317,6 +317,23 @@ static inline void dma_buf_map_memcpy_to(struct dma_buf_map *dst, const void *sr
 		memcpy(dst->vaddr, src, len);
 }
 
+/**
+ * dma_buf_map_memset - Memset into dma-buf mapping
+ * @dst:	The dma-buf mapping structure
+ * @value:	The value to set
+ * @len:	The number of bytes to set in dst
+ *
+ * Set value in dma-buf mapping. Depending on the buffer's location, the helper
+ * picks the correct method of accessing the memory.
+ */
+static inline void dma_buf_map_memset(struct dma_buf_map *dst, int value, size_t len)
+{
+	if (dst->is_iomem)
+		memset_io(dst->vaddr_iomem, value, len);
+	else
+		memset(dst->vaddr, value, len);
+}
+
 /**
  * dma_buf_map_incr - Increments the address stored in a dma-buf mapping
  * @map:	The dma-buf mapping structure
-- 
2.35.0