Support for dma scatter-gather mapping and is intended for testing
mapping performance. It achieves by introducing the dma_sg_map_param
structure and related functions, which enable the implementation of
scatter-gather mapping preparation, mapping, and unmapping operations.
Additionally, the dma_map_benchmark_ops array is updated to include
operations for scatter-gather mapping. This commit aims to provide
a wider range of mapping performance test to cater to different scenarios.

Signed-off-by: Qinxin Xia <xiaqinxin@huawei.com>
---
 include/linux/map_benchmark.h |  43 ++++++++++----
 kernel/dma/map_benchmark.c    | 102 ++++++++++++++++++++++++++++++++++
 2 files changed, 133 insertions(+), 12 deletions(-)

diff --git a/include/linux/map_benchmark.h b/include/linux/map_benchmark.h
index 5294dfd1870f..bf8c9ade43fd 100644
--- a/include/linux/map_benchmark.h
+++ b/include/linux/map_benchmark.h
@@ -17,22 +17,41 @@
 
 enum {
 	DMA_MAP_SINGLE_MODE,
+	DMA_MAP_SG_MODE,
 	DMA_MAP_MODE_MAX
 };
 
+/**
+ * struct map_benchmark - Benchmarking data for DMA mapping operations.
+ * @avg_map_100ns: Average map latency in 100ns.
+ * @map_stddev: Standard deviation of map latency.
+ * @avg_unmap_100ns: Average unmap latency in 100ns.
+ * @unmap_stddev: Standard deviation of unmap latency.
+ * @threads: Number of threads performing map/unmap operations in parallel.
+ * @seconds: Duration of the test in seconds.
+ * @node: NUMA node on which this benchmark will run.
+ * @dma_bits: DMA addressing capability.
+ * @dma_dir: DMA data direction.
+ * @dma_trans_ns: Time for DMA transmission in ns.
+ * @granule: Number of PAGE_SIZE units to map/unmap at once.
+	     In SG mode, this represents the number of scatterlist entries.
+	     In single mode, this represents the total size of the mapping.
+ * @map_mode: Mode of DMA mapping.
+ * @expansion: Reserved for future use.
+ */
 struct map_benchmark {
-	__u64 avg_map_100ns; /* average map latency in 100ns */
-	__u64 map_stddev; /* standard deviation of map latency */
-	__u64 avg_unmap_100ns; /* as above */
+	__u64 avg_map_100ns;
+	__u64 map_stddev;
+	__u64 avg_unmap_100ns;
 	__u64 unmap_stddev;
-	__u32 threads; /* how many threads will do map/unmap in parallel */
-	__u32 seconds; /* how long the test will last */
-	__s32 node; /* which numa node this benchmark will run on */
-	__u32 dma_bits; /* DMA addressing capability */
-	__u32 dma_dir; /* DMA data direction */
-	__u32 dma_trans_ns; /* time for DMA transmission in ns */
-	__u32 granule;  /* how many PAGE_SIZE will do map/unmap once a time */
-	__u8  map_mode; /* the mode of dma map */
-	__u8 expansion[75];     /* For future use */
+	__u32 threads;
+	__u32 seconds;
+	__s32 node;
+	__u32 dma_bits;
+	__u32 dma_dir;
+	__u32 dma_trans_ns;
+	__u32 granule;
+	__u8  map_mode;
+	__u8 expansion[75];
 };
 #endif /* _KERNEL_DMA_BENCHMARK_H */
diff --git a/kernel/dma/map_benchmark.c b/kernel/dma/map_benchmark.c
index f04973eba1d8..72cd2c5f839e 100644
--- a/kernel/dma/map_benchmark.c
+++ b/kernel/dma/map_benchmark.c
@@ -17,6 +17,7 @@
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/platform_device.h>
+#include <linux/scatterlist.h>
 #include <linux/slab.h>
 #include <linux/timekeeping.h>
 
@@ -110,8 +111,109 @@ static struct map_benchmark_ops dma_single_map_benchmark_ops = {
 	.do_unmap = dma_single_map_benchmark_do_unmap,
 };
 
+struct dma_sg_map_param {
+	struct sg_table sgt;
+	struct device *dev;
+	void **buf;
+	u32 npages;
+	u32 dma_dir;
+};
+
+static void *dma_sg_map_benchmark_prepare(struct map_benchmark_data *map)
+{
+	struct scatterlist *sg;
+	int i = 0;
+
+	struct dma_sg_map_param *mparam __free(kfree) = kzalloc(sizeof(*mparam), GFP_KERNEL);
+	if (!mparam)
+		return NULL;
+
+	/*
+	 * Set the number of scatterlist entries based on the granule.
+	 * In SG mode, 'granule' represents the number of scatterlist entries.
+	 * Each scatterlist entry corresponds to a single page.
+	 */
+	mparam->npages = map->bparam.granule;
+	mparam->dma_dir = map->bparam.dma_dir;
+	mparam->dev = map->dev;
+	mparam->buf = kmalloc_array(mparam->npages, sizeof(*mparam->buf),
+				    GFP_KERNEL);
+	if (!mparam->buf)
+		goto out;
+
+	if (sg_alloc_table(&mparam->sgt, mparam->npages, GFP_KERNEL))
+		goto free_buf;
+
+	for_each_sgtable_sg(&mparam->sgt, sg, i) {
+		mparam->buf[i] = (void *)__get_free_page(GFP_KERNEL);
+		if (!mparam->buf[i])
+			goto free_page;
+
+		if (mparam->dma_dir != DMA_FROM_DEVICE)
+			memset(mparam->buf[i], 0x66, PAGE_SIZE);
+
+		sg_set_buf(sg, mparam->buf[i], PAGE_SIZE);
+	}
+
+	return_ptr(mparam);
+
+free_page:
+	while (i-- > 0)
+		free_page((unsigned long)mparam->buf[i]);
+
+	sg_free_table(&mparam->sgt);
+free_buf:
+	kfree(mparam->buf);
+out:
+	return NULL;
+}
+
+static void dma_sg_map_benchmark_unprepare(void *arg)
+{
+	struct dma_sg_map_param *mparam = arg;
+	int i;
+
+	for (i = 0; i < mparam->npages; i++)
+		free_page((unsigned long)mparam->buf[i]);
+
+	sg_free_table(&mparam->sgt);
+
+	kfree(mparam->buf);
+	kfree(mparam);
+}
+
+static int dma_sg_map_benchmark_do_map(void *arg)
+{
+	struct dma_sg_map_param *mparam = arg;
+
+	int sg_mapped = dma_map_sg(mparam->dev, mparam->sgt.sgl,
+				   mparam->npages, mparam->dma_dir);
+	if (!sg_mapped) {
+		pr_err("dma_map_sg failed on %s\n", dev_name(mparam->dev));
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+static void dma_sg_map_benchmark_do_unmap(void *arg)
+{
+	struct dma_sg_map_param *mparam = arg;
+
+	dma_unmap_sg(mparam->dev, mparam->sgt.sgl, mparam->npages,
+		     mparam->dma_dir);
+}
+
+static struct map_benchmark_ops dma_sg_map_benchmark_ops = {
+	.prepare = dma_sg_map_benchmark_prepare,
+	.unprepare = dma_sg_map_benchmark_unprepare,
+	.do_map = dma_sg_map_benchmark_do_map,
+	.do_unmap = dma_sg_map_benchmark_do_unmap,
+};
+
 static struct map_benchmark_ops *dma_map_benchmark_ops[DMA_MAP_MODE_MAX] = {
 	[DMA_MAP_SINGLE_MODE] = &dma_single_map_benchmark_ops,
+	[DMA_MAP_SG_MODE] = &dma_sg_map_benchmark_ops,
 };
 
 static int map_benchmark_thread(void *data)
-- 
2.33.0

On Tue, May 6, 2025 at 3:01 PM Qinxin Xia <xiaqinxin@huawei.com> wrote:
>
> Support for dma scatter-gather mapping and is intended for testing
> mapping performance. It achieves by introducing the dma_sg_map_param
> structure and related functions, which enable the implementation of
> scatter-gather mapping preparation, mapping, and unmapping operations.
> Additionally, the dma_map_benchmark_ops array is updated to include
> operations for scatter-gather mapping. This commit aims to provide
> a wider range of mapping performance test to cater to different scenarios.
>
> Signed-off-by: Qinxin Xia <xiaqinxin@huawei.com>
> ---
>  include/linux/map_benchmark.h |  43 ++++++++++----
>  kernel/dma/map_benchmark.c    | 102 ++++++++++++++++++++++++++++++++++
>  2 files changed, 133 insertions(+), 12 deletions(-)
>
> diff --git a/include/linux/map_benchmark.h b/include/linux/map_benchmark.h
> index 5294dfd1870f..bf8c9ade43fd 100644
> --- a/include/linux/map_benchmark.h
> +++ b/include/linux/map_benchmark.h
> @@ -17,22 +17,41 @@
>
>  enum {
>         DMA_MAP_SINGLE_MODE,
> +       DMA_MAP_SG_MODE,
>         DMA_MAP_MODE_MAX
>  };
>
> +/**
> + * struct map_benchmark - Benchmarking data for DMA mapping operations.
> + * @avg_map_100ns: Average map latency in 100ns.
> + * @map_stddev: Standard deviation of map latency.
> + * @avg_unmap_100ns: Average unmap latency in 100ns.
> + * @unmap_stddev: Standard deviation of unmap latency.
> + * @threads: Number of threads performing map/unmap operations in parallel.
> + * @seconds: Duration of the test in seconds.
> + * @node: NUMA node on which this benchmark will run.
> + * @dma_bits: DMA addressing capability.
> + * @dma_dir: DMA data direction.
> + * @dma_trans_ns: Time for DMA transmission in ns.
> + * @granule: Number of PAGE_SIZE units to map/unmap at once.
> +            In SG mode, this represents the number of scatterlist entries.
> +            In single mode, this represents the total size of the mapping.
> + * @map_mode: Mode of DMA mapping.
> + * @expansion: Reserved for future use.
> + */
>  struct map_benchmark {
> -       __u64 avg_map_100ns; /* average map latency in 100ns */
> -       __u64 map_stddev; /* standard deviation of map latency */
> -       __u64 avg_unmap_100ns; /* as above */
> +       __u64 avg_map_100ns;
> +       __u64 map_stddev;
> +       __u64 avg_unmap_100ns;
>         __u64 unmap_stddev;
> -       __u32 threads; /* how many threads will do map/unmap in parallel */
> -       __u32 seconds; /* how long the test will last */
> -       __s32 node; /* which numa node this benchmark will run on */
> -       __u32 dma_bits; /* DMA addressing capability */
> -       __u32 dma_dir; /* DMA data direction */
> -       __u32 dma_trans_ns; /* time for DMA transmission in ns */
> -       __u32 granule;  /* how many PAGE_SIZE will do map/unmap once a time */
> -       __u8  map_mode; /* the mode of dma map */
> -       __u8 expansion[75];     /* For future use */
> +       __u32 threads;
> +       __u32 seconds;
> +       __s32 node;
> +       __u32 dma_bits;
> +       __u32 dma_dir;
> +       __u32 dma_trans_ns;
> +       __u32 granule;
> +       __u8  map_mode;
> +       __u8 expansion[75];
>  };
>  #endif /* _KERNEL_DMA_BENCHMARK_H */
> diff --git a/kernel/dma/map_benchmark.c b/kernel/dma/map_benchmark.c
> index f04973eba1d8..72cd2c5f839e 100644
> --- a/kernel/dma/map_benchmark.c
> +++ b/kernel/dma/map_benchmark.c
> @@ -17,6 +17,7 @@
>  #include <linux/module.h>
>  #include <linux/pci.h>
>  #include <linux/platform_device.h>
> +#include <linux/scatterlist.h>
>  #include <linux/slab.h>
>  #include <linux/timekeeping.h>
>
> @@ -110,8 +111,109 @@ static struct map_benchmark_ops dma_single_map_benchmark_ops = {
>         .do_unmap = dma_single_map_benchmark_do_unmap,
>  };
>
> +struct dma_sg_map_param {
> +       struct sg_table sgt;
> +       struct device *dev;
> +       void **buf;
> +       u32 npages;
> +       u32 dma_dir;
> +};
> +
> +static void *dma_sg_map_benchmark_prepare(struct map_benchmark_data *map)
> +{
> +       struct scatterlist *sg;
> +       int i = 0;

I'm not sure we need `i = 0`; perhaps just `int i` would be sufficient.

> +
> +       struct dma_sg_map_param *mparam __free(kfree) = kzalloc(sizeof(*mparam), GFP_KERNEL);
> +       if (!mparam)
> +               return NULL;
> +
> +       /*
> +        * Set the number of scatterlist entries based on the granule.
> +        * In SG mode, 'granule' represents the number of scatterlist entries.
> +        * Each scatterlist entry corresponds to a single page.
> +        */
> +       mparam->npages = map->bparam.granule;
> +       mparam->dma_dir = map->bparam.dma_dir;
> +       mparam->dev = map->dev;
> +       mparam->buf = kmalloc_array(mparam->npages, sizeof(*mparam->buf),
> +                                   GFP_KERNEL);
> +       if (!mparam->buf)
> +               goto out;
> +
> +       if (sg_alloc_table(&mparam->sgt, mparam->npages, GFP_KERNEL))
> +               goto free_buf;
> +
> +       for_each_sgtable_sg(&mparam->sgt, sg, i) {
> +               mparam->buf[i] = (void *)__get_free_page(GFP_KERNEL);
> +               if (!mparam->buf[i])
> +                       goto free_page;
> +
> +               if (mparam->dma_dir != DMA_FROM_DEVICE)
> +                       memset(mparam->buf[i], 0x66, PAGE_SIZE);
> +
> +               sg_set_buf(sg, mparam->buf[i], PAGE_SIZE);
> +       }
> +
> +       return_ptr(mparam);
> +
> +free_page:
> +       while (i-- > 0)
> +               free_page((unsigned long)mparam->buf[i]);
> +
> +       sg_free_table(&mparam->sgt);
> +free_buf:
> +       kfree(mparam->buf);
> +out:
> +       return NULL;
> +}
> +
> +static void dma_sg_map_benchmark_unprepare(void *arg)

The term "arg" is meaningless for a function argument, as it's already implied
that it is an argument.

> +{
> +       struct dma_sg_map_param *mparam = arg;
> +       int i;
> +
> +       for (i = 0; i < mparam->npages; i++)
> +               free_page((unsigned long)mparam->buf[i]);
> +
> +       sg_free_table(&mparam->sgt);
> +
> +       kfree(mparam->buf);
> +       kfree(mparam);
> +}
> +
> +static int dma_sg_map_benchmark_do_map(void *arg)
> +{
> +       struct dma_sg_map_param *mparam = arg;
> +
> +       int sg_mapped = dma_map_sg(mparam->dev, mparam->sgt.sgl,
> +                                  mparam->npages, mparam->dma_dir);

int ret.

> +       if (!sg_mapped) {
> +               pr_err("dma_map_sg failed on %s\n", dev_name(mparam->dev));
> +               return -ENOMEM;
> +       }
> +
> +       return 0;
> +}
> +
> +static void dma_sg_map_benchmark_do_unmap(void *arg)
> +{
> +       struct dma_sg_map_param *mparam = arg;
> +
> +       dma_unmap_sg(mparam->dev, mparam->sgt.sgl, mparam->npages,
> +                    mparam->dma_dir);
> +}
> +
> +static struct map_benchmark_ops dma_sg_map_benchmark_ops = {
> +       .prepare = dma_sg_map_benchmark_prepare,
> +       .unprepare = dma_sg_map_benchmark_unprepare,
> +       .do_map = dma_sg_map_benchmark_do_map,
> +       .do_unmap = dma_sg_map_benchmark_do_unmap,
> +};
> +
>  static struct map_benchmark_ops *dma_map_benchmark_ops[DMA_MAP_MODE_MAX] = {
>         [DMA_MAP_SINGLE_MODE] = &dma_single_map_benchmark_ops,
> +       [DMA_MAP_SG_MODE] = &dma_sg_map_benchmark_ops,
>  };
>
>  static int map_benchmark_thread(void *data)
> --
> 2.33.0
>

Thanks
barry

在 2025/5/7 10:39, Barry Song 写道:
> On Tue, May 6, 2025 at 3:01 PM Qinxin Xia <xiaqinxin@huawei.com> wrote:
>> Support for dma scatter-gather mapping and is intended for testing
>> mapping performance. It achieves by introducing the dma_sg_map_param
>> structure and related functions, which enable the implementation of
>> scatter-gather mapping preparation, mapping, and unmapping operations.
>> Additionally, the dma_map_benchmark_ops array is updated to include
>> operations for scatter-gather mapping. This commit aims to provide
>> a wider range of mapping performance test to cater to different scenarios.
>>
>> Signed-off-by: Qinxin Xia <xiaqinxin@huawei.com>
>> ---
>>   include/linux/map_benchmark.h |  43 ++++++++++----
>>   kernel/dma/map_benchmark.c    | 102 ++++++++++++++++++++++++++++++++++
>>   2 files changed, 133 insertions(+), 12 deletions(-)
>>
>> diff --git a/include/linux/map_benchmark.h b/include/linux/map_benchmark.h
>> index 5294dfd1870f..bf8c9ade43fd 100644
>> --- a/include/linux/map_benchmark.h
>> +++ b/include/linux/map_benchmark.h
>> @@ -17,22 +17,41 @@
>>
>>   enum {
>>          DMA_MAP_SINGLE_MODE,
>> +       DMA_MAP_SG_MODE,
>>          DMA_MAP_MODE_MAX
>>   };
>>
>> +/**
>> + * struct map_benchmark - Benchmarking data for DMA mapping operations.
>> + * @avg_map_100ns: Average map latency in 100ns.
>> + * @map_stddev: Standard deviation of map latency.
>> + * @avg_unmap_100ns: Average unmap latency in 100ns.
>> + * @unmap_stddev: Standard deviation of unmap latency.
>> + * @threads: Number of threads performing map/unmap operations in parallel.
>> + * @seconds: Duration of the test in seconds.
>> + * @node: NUMA node on which this benchmark will run.
>> + * @dma_bits: DMA addressing capability.
>> + * @dma_dir: DMA data direction.
>> + * @dma_trans_ns: Time for DMA transmission in ns.
>> + * @granule: Number of PAGE_SIZE units to map/unmap at once.
>> +            In SG mode, this represents the number of scatterlist entries.
>> +            In single mode, this represents the total size of the mapping.
>> + * @map_mode: Mode of DMA mapping.
>> + * @expansion: Reserved for future use.
>> + */
>>   struct map_benchmark {
>> -       __u64 avg_map_100ns; /* average map latency in 100ns */
>> -       __u64 map_stddev; /* standard deviation of map latency */
>> -       __u64 avg_unmap_100ns; /* as above */
>> +       __u64 avg_map_100ns;
>> +       __u64 map_stddev;
>> +       __u64 avg_unmap_100ns;
>>          __u64 unmap_stddev;
>> -       __u32 threads; /* how many threads will do map/unmap in parallel */
>> -       __u32 seconds; /* how long the test will last */
>> -       __s32 node; /* which numa node this benchmark will run on */
>> -       __u32 dma_bits; /* DMA addressing capability */
>> -       __u32 dma_dir; /* DMA data direction */
>> -       __u32 dma_trans_ns; /* time for DMA transmission in ns */
>> -       __u32 granule;  /* how many PAGE_SIZE will do map/unmap once a time */
>> -       __u8  map_mode; /* the mode of dma map */
>> -       __u8 expansion[75];     /* For future use */
>> +       __u32 threads;
>> +       __u32 seconds;
>> +       __s32 node;
>> +       __u32 dma_bits;
>> +       __u32 dma_dir;
>> +       __u32 dma_trans_ns;
>> +       __u32 granule;
>> +       __u8  map_mode;
>> +       __u8 expansion[75];
>>   };
>>   #endif /* _KERNEL_DMA_BENCHMARK_H */
>> diff --git a/kernel/dma/map_benchmark.c b/kernel/dma/map_benchmark.c
>> index f04973eba1d8..72cd2c5f839e 100644
>> --- a/kernel/dma/map_benchmark.c
>> +++ b/kernel/dma/map_benchmark.c
>> @@ -17,6 +17,7 @@
>>   #include <linux/module.h>
>>   #include <linux/pci.h>
>>   #include <linux/platform_device.h>
>> +#include <linux/scatterlist.h>
>>   #include <linux/slab.h>
>>   #include <linux/timekeeping.h>
>>
>> @@ -110,8 +111,109 @@ static struct map_benchmark_ops dma_single_map_benchmark_ops = {
>>          .do_unmap = dma_single_map_benchmark_do_unmap,
>>   };
>>
>> +struct dma_sg_map_param {
>> +       struct sg_table sgt;
>> +       struct device *dev;
>> +       void **buf;
>> +       u32 npages;
>> +       u32 dma_dir;
>> +};
>> +
>> +static void *dma_sg_map_benchmark_prepare(struct map_benchmark_data *map)
>> +{
>> +       struct scatterlist *sg;
>> +       int i = 0;
> I'm not sure we need `i = 0`; perhaps just `int i` would be sufficient.
You're right, 'int i' is more appropriate.
>
>> +
>> +       struct dma_sg_map_param *mparam __free(kfree) = kzalloc(sizeof(*mparam), GFP_KERNEL);
>> +       if (!mparam)
>> +               return NULL;
>> +
>> +       /*
>> +        * Set the number of scatterlist entries based on the granule.
>> +        * In SG mode, 'granule' represents the number of scatterlist entries.
>> +        * Each scatterlist entry corresponds to a single page.
>> +        */
>> +       mparam->npages = map->bparam.granule;
>> +       mparam->dma_dir = map->bparam.dma_dir;
>> +       mparam->dev = map->dev;
>> +       mparam->buf = kmalloc_array(mparam->npages, sizeof(*mparam->buf),
>> +                                   GFP_KERNEL);
>> +       if (!mparam->buf)
>> +               goto out;
>> +
>> +       if (sg_alloc_table(&mparam->sgt, mparam->npages, GFP_KERNEL))
>> +               goto free_buf;
>> +
>> +       for_each_sgtable_sg(&mparam->sgt, sg, i) {
>> +               mparam->buf[i] = (void *)__get_free_page(GFP_KERNEL);
>> +               if (!mparam->buf[i])
>> +                       goto free_page;
>> +
>> +               if (mparam->dma_dir != DMA_FROM_DEVICE)
>> +                       memset(mparam->buf[i], 0x66, PAGE_SIZE);
>> +
>> +               sg_set_buf(sg, mparam->buf[i], PAGE_SIZE);
>> +       }
>> +
>> +       return_ptr(mparam);
>> +
>> +free_page:
>> +       while (i-- > 0)
>> +               free_page((unsigned long)mparam->buf[i]);
>> +
>> +       sg_free_table(&mparam->sgt);
>> +free_buf:
>> +       kfree(mparam->buf);
>> +out:
>> +       return NULL;
>> +}
>> +
>> +static void dma_sg_map_benchmark_unprepare(void *arg)
> The term "arg" is meaningless for a function argument, as it's already implied
> that it is an argument.
Okay, I'm going to modify this in the next version.
>> +{
>> +       struct dma_sg_map_param *mparam = arg;
>> +       int i;
>> +
>> +       for (i = 0; i < mparam->npages; i++)
>> +               free_page((unsigned long)mparam->buf[i]);
>> +
>> +       sg_free_table(&mparam->sgt);
>> +
>> +       kfree(mparam->buf);
>> +       kfree(mparam);
>> +}
>> +
>> +static int dma_sg_map_benchmark_do_map(void *arg)
>> +{
>> +       struct dma_sg_map_param *mparam = arg;
>> +
>> +       int sg_mapped = dma_map_sg(mparam->dev, mparam->sgt.sgl,
>> +                                  mparam->npages, mparam->dma_dir);
> int ret.

Okay, I'm going to modify this in the next version.

Thanks!

>> +       if (!sg_mapped) {
>> +               pr_err("dma_map_sg failed on %s\n", dev_name(mparam->dev));
>> +               return -ENOMEM;
>> +       }
>> +
>> +       return 0;
>> +}
>> +
>> +static void dma_sg_map_benchmark_do_unmap(void *arg)
>> +{
>> +       struct dma_sg_map_param *mparam = arg;
>> +
>> +       dma_unmap_sg(mparam->dev, mparam->sgt.sgl, mparam->npages,
>> +                    mparam->dma_dir);
>> +}
>> +
>> +static struct map_benchmark_ops dma_sg_map_benchmark_ops = {
>> +       .prepare = dma_sg_map_benchmark_prepare,
>> +       .unprepare = dma_sg_map_benchmark_unprepare,
>> +       .do_map = dma_sg_map_benchmark_do_map,
>> +       .do_unmap = dma_sg_map_benchmark_do_unmap,
>> +};
>> +
>>   static struct map_benchmark_ops *dma_map_benchmark_ops[DMA_MAP_MODE_MAX] = {
>>          [DMA_MAP_SINGLE_MODE] = &dma_single_map_benchmark_ops,
>> +       [DMA_MAP_SG_MODE] = &dma_sg_map_benchmark_ops,
>>   };
>>
>>   static int map_benchmark_thread(void *data)
>> --
>> 2.33.0
>>
> Thanks
> barry