linux-kernel - [RFC 2/2] fpga: versal: Use the scatterlist interface

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Date:   Wed, 22 Nov 2023 11:00:35 +0530
From:   Nava kishore Manne <nava.kishore.manne@....com>
To:     <mdf@...nel.org>, <hao.wu@...el.com>, <yilun.xu@...el.com>,
        <trix@...hat.com>, <sumit.semwal@...aro.org>,
        <christian.koenig@....com>, <linux-fpga@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-media@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <linaro-mm-sig@...ts.linaro.org>
Subject: [RFC 2/2] fpga: versal: Use the scatterlist interface

Allows drivers to request the Configuration image
be loaded from dma-able continuous buffer to avoid
needless memory pressure and delays due to multiple
copies.

Signed-off-by: Nava kishore Manne <nava.kishore.manne@....com>
---
 drivers/fpga/versal-fpga.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/fpga/versal-fpga.c b/drivers/fpga/versal-fpga.c
index 3710e8f01be2..bf4fb4426417 100644
--- a/drivers/fpga/versal-fpga.c
+++ b/drivers/fpga/versal-fpga.c
@@ -19,6 +19,18 @@ static int versal_fpga_ops_write_init(struct fpga_manager *mgr,
 	return 0;
 }
 
+static int versal_fpga_ops_write_sg(struct fpga_manager *mgr,
+				    struct sg_table *sgt)
+{
+	dma_addr_t dma_addr;
+	int ret;
+
+	dma_addr = sg_dma_address(sgt->sgl);
+	ret = zynqmp_pm_load_pdi(PDI_SRC_DDR, dma_addr);
+
+	return ret;
+}
+
 static int versal_fpga_ops_write(struct fpga_manager *mgr,
 				 const char *buf, size_t size)
 {
@@ -40,6 +52,7 @@ static int versal_fpga_ops_write(struct fpga_manager *mgr,
 static const struct fpga_manager_ops versal_fpga_ops = {
 	.write_init = versal_fpga_ops_write_init,
 	.write = versal_fpga_ops_write,
+	.write_sg = versal_fpga_ops_write_sg,
 };
 
 static int versal_fpga_probe(struct platform_device *pdev)
-- 
2.25.1