[PATCHv7 15/24] zram: introduce algorithm_params device attribute

[Sergey Senozhatsky]

This attribute is used to setup compression algorithms'
parameters, so we can tweak algorithms' characteristics.
At this point only 'level' is supported (to be extended
in the future).

Each call sets up parameters for one particular algorithm,
which should be specified either by the algorithm's priority
or algo name.  This is expected to be called after corresponding
algorithm is selected via comp_algorithm or recomp_algorithm.

 echo "priority=0 level=1" > /sys/block/zram0/algorithm_params
or
 echo "algo=zstd level=1" > /sys/block/zram0/algorithm_params

Signed-off-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
---
 Documentation/ABI/testing/sysfs-block-zram  |  7 +++
 Documentation/admin-guide/blockdev/zram.rst |  1 +
 drivers/block/zram/zram_drv.c               | 68 +++++++++++++++++++++
 3 files changed, 76 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-block-zram b/Documentation/ABI/testing/sysfs-block-zram
index 628a00fb20a9..1ef69e0271f9 100644
--- a/Documentation/ABI/testing/sysfs-block-zram
+++ b/Documentation/ABI/testing/sysfs-block-zram
@@ -151,3 +151,10 @@ Contact:	Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
 Description:
 		The recompress file is write-only and triggers re-compression
 		with secondary compression algorithms.
+
+What:		/sys/block/zram<id>/algorithm_params
+Date:		August 2024
+Contact:	Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
+Description:
+		The algorithm_params file is write-only and is used to setup
+		compression algorithm parameters.
diff --git a/Documentation/admin-guide/blockdev/zram.rst b/Documentation/admin-guide/blockdev/zram.rst
index 181d55d64326..96d81dc12528 100644
--- a/Documentation/admin-guide/blockdev/zram.rst
+++ b/Documentation/admin-guide/blockdev/zram.rst
@@ -198,6 +198,7 @@ writeback_limit_enable  RW	show and set writeback_limit feature
 max_comp_streams  	RW	the number of possible concurrent compress
 				operations
 comp_algorithm    	RW	show and change the compression algorithm
+algorithm_params	WO	setup compression algorithm parameters
 compact           	WO	trigger memory compaction
 debug_stat        	RO	this file is used for zram debugging purposes
 backing_dev	  	RW	set up backend storage for zram to write out
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index ff6724bbdf91..e29e952b99c3 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -998,6 +998,72 @@ static int __comp_algorithm_store(struct zram *zram, u32 prio, const char *buf)
 	return 0;
 }
 
+static int comp_params_store(struct zram *zram, u32 prio, s32 level)
+{
+	zram->params[prio].level = level;
+	return 0;
+}
+
+static ssize_t algorithm_params_store(struct device *dev,
+				      struct device_attribute *attr,
+				      const char *buf,
+				      size_t len)
+{
+	s32 prio = ZRAM_PRIMARY_COMP, level = ZCOMP_PARAM_NO_LEVEL;
+	char *args, *param, *val, *algo = NULL;
+	struct zram *zram = dev_to_zram(dev);
+	int ret;
+
+	args = skip_spaces(buf);
+	while (*args) {
+		args = next_arg(args, &param, &val);
+
+		if (!val || !*val)
+			return -EINVAL;
+
+		if (!strcmp(param, "priority")) {
+			ret = kstrtoint(val, 10, &prio);
+			if (ret)
+				return ret;
+			continue;
+		}
+
+		if (!strcmp(param, "level")) {
+			ret = kstrtoint(val, 10, &level);
+			if (ret)
+				return ret;
+			continue;
+		}
+
+		if (!strcmp(param, "algo")) {
+			algo = val;
+			continue;
+		}
+	}
+
+	/* Lookup priority by algorithm name */
+	if (algo) {
+		s32 p;
+
+		prio = -EINVAL;
+		for (p = ZRAM_PRIMARY_COMP; p < ZRAM_MAX_COMPS; p++) {
+			if (!zram->comp_algs[p])
+				continue;
+
+			if (!strcmp(zram->comp_algs[p], algo)) {
+				prio = p;
+				break;
+			}
+		}
+	}
+
+	if (prio < ZRAM_PRIMARY_COMP || prio >= ZRAM_MAX_COMPS)
+		return -EINVAL;
+
+	ret = comp_params_store(zram, prio, level);
+	return ret ? ret : len;
+}
+
 static ssize_t comp_algorithm_show(struct device *dev,
 				   struct device_attribute *attr,
 				   char *buf)
@@ -2169,6 +2235,7 @@ static DEVICE_ATTR_RW(writeback_limit_enable);
 static DEVICE_ATTR_RW(recomp_algorithm);
 static DEVICE_ATTR_WO(recompress);
 #endif
+static DEVICE_ATTR_WO(algorithm_params);
 
 static struct attribute *zram_disk_attrs[] = {
 	&dev_attr_disksize.attr,
@@ -2196,6 +2263,7 @@ static struct attribute *zram_disk_attrs[] = {
 	&dev_attr_recomp_algorithm.attr,
 	&dev_attr_recompress.attr,
 #endif
+	&dev_attr_algorithm_params.attr,
 	NULL,
 };
 
-- 
2.46.0.469.g59c65b2a67-goog