add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/base/cacheinfo.c
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@@ -213,6 +213,8 @@
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 	return -ENOTSUPP;
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 }
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+unsigned int coherency_max_size;
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+
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 static int cache_shared_cpu_map_setup(unsigned int cpu)
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 {
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 	struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
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@@ -251,6 +253,9 @@
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 				cpumask_set_cpu(i, &this_leaf->shared_cpu_map);
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 			}
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 		}
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+		/* record the maximum cache line size */
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+		if (this_leaf->coherency_line_size > coherency_max_size)
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+			coherency_max_size = this_leaf->coherency_line_size;
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 	}
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 	return 0;
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@@ -357,7 +362,7 @@
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 		struct device_attribute *attr, char *buf)	\
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 {								\
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 	struct cacheinfo *this_leaf = dev_get_drvdata(dev);	\
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-	return sprintf(buf, "%u\n", this_leaf->object);		\
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+	return sysfs_emit(buf, "%u\n", this_leaf->object);	\
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 }
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 show_one(id, id);
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@@ -372,44 +377,48 @@
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 {
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 	struct cacheinfo *this_leaf = dev_get_drvdata(dev);
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-	return sprintf(buf, "%uK\n", this_leaf->size >> 10);
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-}
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-
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-static ssize_t shared_cpumap_show_func(struct device *dev, bool list, char *buf)
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-{
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-	struct cacheinfo *this_leaf = dev_get_drvdata(dev);
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-	const struct cpumask *mask = &this_leaf->shared_cpu_map;
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-
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-	return cpumap_print_to_pagebuf(list, buf, mask);
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+	return sysfs_emit(buf, "%uK\n", this_leaf->size >> 10);
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 }
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 static ssize_t shared_cpu_map_show(struct device *dev,
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 				   struct device_attribute *attr, char *buf)
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 {
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-	return shared_cpumap_show_func(dev, false, buf);
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+	struct cacheinfo *this_leaf = dev_get_drvdata(dev);
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+	const struct cpumask *mask = &this_leaf->shared_cpu_map;
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+
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+	return sysfs_emit(buf, "%*pb\n", nr_cpu_ids, mask);
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 }
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 static ssize_t shared_cpu_list_show(struct device *dev,
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 				    struct device_attribute *attr, char *buf)
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 {
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-	return shared_cpumap_show_func(dev, true, buf);
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+	struct cacheinfo *this_leaf = dev_get_drvdata(dev);
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+	const struct cpumask *mask = &this_leaf->shared_cpu_map;
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+
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+	return sysfs_emit(buf, "%*pbl\n", nr_cpu_ids, mask);
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 }
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 static ssize_t type_show(struct device *dev,
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 			 struct device_attribute *attr, char *buf)
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 {
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 	struct cacheinfo *this_leaf = dev_get_drvdata(dev);
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+	const char *output;
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 	switch (this_leaf->type) {
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 	case CACHE_TYPE_DATA:
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-		return sprintf(buf, "Data\n");
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+		output = "Data";
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+		break;
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 	case CACHE_TYPE_INST:
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-		return sprintf(buf, "Instruction\n");
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+		output = "Instruction";
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+		break;
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 	case CACHE_TYPE_UNIFIED:
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-		return sprintf(buf, "Unified\n");
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+		output = "Unified";
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+		break;
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 	default:
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 		return -EINVAL;
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 	}
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+
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+	return sysfs_emit(buf, "%s\n", output);
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 }
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 static ssize_t allocation_policy_show(struct device *dev,
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@@ -417,15 +426,18 @@
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 {
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 	struct cacheinfo *this_leaf = dev_get_drvdata(dev);
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 	unsigned int ci_attr = this_leaf->attributes;
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-	int n = 0;
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+	const char *output;
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 	if ((ci_attr & CACHE_READ_ALLOCATE) && (ci_attr & CACHE_WRITE_ALLOCATE))
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-		n = sprintf(buf, "ReadWriteAllocate\n");
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+		output = "ReadWriteAllocate";
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 	else if (ci_attr & CACHE_READ_ALLOCATE)
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-		n = sprintf(buf, "ReadAllocate\n");
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+		output = "ReadAllocate";
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 	else if (ci_attr & CACHE_WRITE_ALLOCATE)
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-		n = sprintf(buf, "WriteAllocate\n");
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-	return n;
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+		output = "WriteAllocate";
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+	else
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+		return 0;
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+
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+	return sysfs_emit(buf, "%s\n", output);
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 }
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 static ssize_t write_policy_show(struct device *dev,
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@@ -436,9 +448,9 @@
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 	int n = 0;
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 	if (ci_attr & CACHE_WRITE_THROUGH)
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-		n = sprintf(buf, "WriteThrough\n");
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+		n = sysfs_emit(buf, "WriteThrough\n");
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 	else if (ci_attr & CACHE_WRITE_BACK)
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-		n = sprintf(buf, "WriteBack\n");
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+		n = sysfs_emit(buf, "WriteBack\n");
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 	return n;
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 }
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@@ -613,6 +625,8 @@
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 		this_leaf = this_cpu_ci->info_list + i;
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 		if (this_leaf->disable_sysfs)
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 			continue;
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+		if (this_leaf->type == CACHE_TYPE_NOCACHE)
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+			break;
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 		cache_groups = cache_get_attribute_groups(this_leaf);
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 		ci_dev = cpu_device_create(parent, this_leaf, cache_groups,
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 					   "index%1u", i);