[PATCH v5 01/11] cpumask: factor out show_cpumap into separate helper function
From: Sudeep Holla
Date: Tue Sep 30 2014 - 09:48:53 EST
Many sysfs *_show function use cpu{list,mask}_scnprintf to copy cpumap
to the buffer aligned to PAGE_SIZE, append '\n' and '\0' to return null
terminated buffer with newline.
This patch creates a new helper function cpumap_print_to_pagebuf in
cpumask.h using newly added bitmap_print_to_pagebuf and consolidates
most of those sysfs functions using the new helper function.
Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx>
Suggested-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
Tested-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
Acked-by: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>
Acked-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: x86@xxxxxxxxxx
Cc: linux-acpi@xxxxxxxxxxxxxxx
Cc: linux-pci@xxxxxxxxxxxxxxx
---
arch/x86/kernel/cpu/perf_event_amd_iommu.c | 5 +---
arch/x86/kernel/cpu/perf_event_amd_uncore.c | 6 +----
arch/x86/kernel/cpu/perf_event_intel_rapl.c | 6 +----
arch/x86/kernel/cpu/perf_event_intel_uncore.c | 6 +----
drivers/acpi/acpi_pad.c | 8 +++---
drivers/base/cpu.c | 5 +---
drivers/base/node.c | 14 +++-------
drivers/base/topology.c | 22 ++-------------
drivers/pci/pci-sysfs.c | 39 +++++++--------------------
include/linux/bitmap.h | 3 +++
include/linux/cpumask.h | 17 ++++++++++++
lib/bitmap.c | 29 ++++++++++++++++++++
12 files changed, 73 insertions(+), 87 deletions(-)
diff --git a/arch/x86/kernel/cpu/perf_event_amd_iommu.c b/arch/x86/kernel/cpu/perf_event_amd_iommu.c
index 639d1289b1ba..97242a9242bd 100644
--- a/arch/x86/kernel/cpu/perf_event_amd_iommu.c
+++ b/arch/x86/kernel/cpu/perf_event_amd_iommu.c
@@ -130,10 +130,7 @@ static ssize_t _iommu_cpumask_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
- int n = cpulist_scnprintf(buf, PAGE_SIZE - 2, &iommu_cpumask);
- buf[n++] = '\n';
- buf[n] = '\0';
- return n;
+ return cpumap_print_to_pagebuf(true, buf, &iommu_cpumask);
}
static DEVICE_ATTR(cpumask, S_IRUGO, _iommu_cpumask_show, NULL);
diff --git a/arch/x86/kernel/cpu/perf_event_amd_uncore.c b/arch/x86/kernel/cpu/perf_event_amd_uncore.c
index 30790d798e6b..cc6cedb8f25d 100644
--- a/arch/x86/kernel/cpu/perf_event_amd_uncore.c
+++ b/arch/x86/kernel/cpu/perf_event_amd_uncore.c
@@ -219,7 +219,6 @@ static ssize_t amd_uncore_attr_show_cpumask(struct device *dev,
struct device_attribute *attr,
char *buf)
{
- int n;
cpumask_t *active_mask;
struct pmu *pmu = dev_get_drvdata(dev);
@@ -230,10 +229,7 @@ static ssize_t amd_uncore_attr_show_cpumask(struct device *dev,
else
return 0;
- n = cpulist_scnprintf(buf, PAGE_SIZE - 2, active_mask);
- buf[n++] = '\n';
- buf[n] = '\0';
- return n;
+ return cpumap_print_to_pagebuf(true, buf, active_mask);
}
static DEVICE_ATTR(cpumask, S_IRUGO, amd_uncore_attr_show_cpumask, NULL);
diff --git a/arch/x86/kernel/cpu/perf_event_intel_rapl.c b/arch/x86/kernel/cpu/perf_event_intel_rapl.c
index 619f7699487a..3256cb87834e 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_rapl.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_rapl.c
@@ -365,11 +365,7 @@ static void rapl_pmu_event_read(struct perf_event *event)
static ssize_t rapl_get_attr_cpumask(struct device *dev,
struct device_attribute *attr, char *buf)
{
- int n = cpulist_scnprintf(buf, PAGE_SIZE - 2, &rapl_cpu_mask);
-
- buf[n++] = '\n';
- buf[n] = '\0';
- return n;
+ return cpumap_print_to_pagebuf(true, buf, &rapl_cpu_mask);
}
static DEVICE_ATTR(cpumask, S_IRUGO, rapl_get_attr_cpumask, NULL);
diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
index 0939f86f543d..3c8ddf0b89ad 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
@@ -3617,11 +3617,7 @@ static int uncore_pmu_event_init(struct perf_event *event)
static ssize_t uncore_get_attr_cpumask(struct device *dev,
struct device_attribute *attr, char *buf)
{
- int n = cpulist_scnprintf(buf, PAGE_SIZE - 2, &uncore_cpu_mask);
-
- buf[n++] = '\n';
- buf[n] = '\0';
- return n;
+ return cpumap_print_to_pagebuf(true, buf, &uncore_cpu_mask);
}
static DEVICE_ATTR(cpumask, S_IRUGO, uncore_get_attr_cpumask, NULL);
diff --git a/drivers/acpi/acpi_pad.c b/drivers/acpi/acpi_pad.c
index f148a0580e04..c7b105c0e1d3 100644
--- a/drivers/acpi/acpi_pad.c
+++ b/drivers/acpi/acpi_pad.c
@@ -350,12 +350,10 @@ static ssize_t acpi_pad_idlecpus_store(struct device *dev,
static ssize_t acpi_pad_idlecpus_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- int n = 0;
- n = cpumask_scnprintf(buf, PAGE_SIZE-2, to_cpumask(pad_busy_cpus_bits));
- buf[n++] = '\n';
- buf[n] = '\0';
- return n;
+ return cpumap_print_to_pagebuf(false, buf,
+ to_cpumask(pad_busy_cpus_bits));
}
+
static DEVICE_ATTR(idlecpus, S_IRUGO|S_IWUSR,
acpi_pad_idlecpus_show,
acpi_pad_idlecpus_store);
diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index 006b1bc5297d..4d8a56406fbb 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -207,11 +207,8 @@ static ssize_t show_cpus_attr(struct device *dev,
char *buf)
{
struct cpu_attr *ca = container_of(attr, struct cpu_attr, attr);
- int n = cpulist_scnprintf(buf, PAGE_SIZE-2, *(ca->map));
- buf[n++] = '\n';
- buf[n] = '\0';
- return n;
+ return cpumap_print_to_pagebuf(true, buf, *ca->map);
}
#define _CPU_ATTR(name, map) \
diff --git a/drivers/base/node.c b/drivers/base/node.c
index c6d3ae05f1ca..e68c134551ea 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -25,32 +25,26 @@ static struct bus_type node_subsys = {
};
-static ssize_t node_read_cpumap(struct device *dev, int type, char *buf)
+static ssize_t node_read_cpumap(struct device *dev, bool list, char *buf)
{
struct node *node_dev = to_node(dev);
const struct cpumask *mask = cpumask_of_node(node_dev->dev.id);
- int len;
/* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));
- len = type?
- cpulist_scnprintf(buf, PAGE_SIZE-2, mask) :
- cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
- buf[len++] = '\n';
- buf[len] = '\0';
- return len;
+ return cpumap_print_to_pagebuf(list, buf, mask);
}
static inline ssize_t node_read_cpumask(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return node_read_cpumap(dev, 0, buf);
+ return node_read_cpumap(dev, false, buf);
}
static inline ssize_t node_read_cpulist(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return node_read_cpumap(dev, 1, buf);
+ return node_read_cpumap(dev, true, buf);
}
static DEVICE_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL);
diff --git a/drivers/base/topology.c b/drivers/base/topology.c
index be7c1fb7c0c9..f7c353843ddf 100644
--- a/drivers/base/topology.c
+++ b/drivers/base/topology.c
@@ -42,29 +42,11 @@ static ssize_t show_##name(struct device *dev, \
return sprintf(buf, "%d\n", topology_##name(dev->id)); \
}
-#if defined(topology_thread_cpumask) || defined(topology_core_cpumask) || \
- defined(topology_book_cpumask)
-static ssize_t show_cpumap(int type, const struct cpumask *mask, char *buf)
-{
- ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf;
- int n = 0;
-
- if (len > 1) {
- n = type?
- cpulist_scnprintf(buf, len-2, mask) :
- cpumask_scnprintf(buf, len-2, mask);
- buf[n++] = '\n';
- buf[n] = '\0';
- }
- return n;
-}
-#endif
-
#define define_siblings_show_map(name) \
static ssize_t show_##name(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
- return show_cpumap(0, topology_##name(dev->id), buf); \
+ return cpumap_print_to_pagebuf(false, buf, topology_##name(dev->id));\
}
#define define_siblings_show_list(name) \
@@ -72,7 +54,7 @@ static ssize_t show_##name##_list(struct device *dev, \
struct device_attribute *attr, \
char *buf) \
{ \
- return show_cpumap(1, topology_##name(dev->id), buf); \
+ return cpumap_print_to_pagebuf(true, buf, topology_##name(dev->id));\
}
#define define_siblings_show_func(name) \
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 9ff0a901ecf7..b8c0ffb36ae7 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -77,11 +77,10 @@ static ssize_t broken_parity_status_store(struct device *dev,
}
static DEVICE_ATTR_RW(broken_parity_status);
-static ssize_t pci_dev_show_local_cpu(struct device *dev, int type,
+static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list,
struct device_attribute *attr, char *buf)
{
const struct cpumask *mask;
- int len;
#ifdef CONFIG_NUMA
mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
@@ -89,59 +88,41 @@ static ssize_t pci_dev_show_local_cpu(struct device *dev, int type,
#else
mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
#endif
- len = type ?
- cpumask_scnprintf(buf, PAGE_SIZE-2, mask) :
- cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
-
- buf[len++] = '\n';
- buf[len] = '\0';
- return len;
+ return cpumap_print_to_pagebuf(list, buf, mask);
}
static ssize_t local_cpus_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return pci_dev_show_local_cpu(dev, 1, attr, buf);
+ return pci_dev_show_local_cpu(dev, false, attr, buf);
}
static DEVICE_ATTR_RO(local_cpus);
static ssize_t local_cpulist_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return pci_dev_show_local_cpu(dev, 0, attr, buf);
+ return pci_dev_show_local_cpu(dev, true, attr, buf);
}
static DEVICE_ATTR_RO(local_cpulist);
/*
* PCI Bus Class Devices
*/
-static ssize_t pci_bus_show_cpuaffinity(struct device *dev, int type,
- struct device_attribute *attr,
- char *buf)
-{
- int ret;
- const struct cpumask *cpumask;
-
- cpumask = cpumask_of_pcibus(to_pci_bus(dev));
- ret = type ?
- cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask) :
- cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
- buf[ret++] = '\n';
- buf[ret] = '\0';
- return ret;
-}
-
static ssize_t cpuaffinity_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
+ const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
+
+ return cpumap_print_to_pagebuf(false, buf, cpumask);
}
static DEVICE_ATTR_RO(cpuaffinity);
static ssize_t cpulistaffinity_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
+ const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
+
+ return cpumap_print_to_pagebuf(true, buf, cpumask);
}
static DEVICE_ATTR_RO(cpulistaffinity);
diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h
index e1c8d080c427..9d5c3224a1e2 100644
--- a/include/linux/bitmap.h
+++ b/include/linux/bitmap.h
@@ -60,6 +60,7 @@
* bitmap_find_free_region(bitmap, bits, order) Find and allocate bit region
* bitmap_release_region(bitmap, pos, order) Free specified bit region
* bitmap_allocate_region(bitmap, pos, order) Allocate specified bit region
+ * bitmap_print_to_pagebuf(list, buf, mask, nbits) Print bitmap src as list/hex
*/
/*
@@ -145,6 +146,8 @@ extern void bitmap_release_region(unsigned long *bitmap, unsigned int pos, int o
extern int bitmap_allocate_region(unsigned long *bitmap, unsigned int pos, int order);
extern void bitmap_copy_le(void *dst, const unsigned long *src, int nbits);
extern int bitmap_ord_to_pos(const unsigned long *bitmap, int n, int bits);
+extern int bitmap_print_to_pagebuf(bool list, char *buf,
+ const unsigned long *maskp, int nmaskbits);
#define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) % BITS_PER_LONG))
#define BITMAP_LAST_WORD_MASK(nbits) \
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index 2997af6d2ccd..d8a6f8a1d308 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -792,6 +792,23 @@ static inline const struct cpumask *get_cpu_mask(unsigned int cpu)
}
#endif /* NR_CPUS > BITS_PER_LONG */
+/**
+ * cpumap_print_to_pagebuf - copies the cpumask into the buffer either
+ * as comma-separated list of cpus or hex values of cpumask
+ * @list: indicates whether the cpumap must be list
+ * @mask: the cpumask to copy
+ * @buf: the buffer to copy into
+ *
+ * Returns the length of the (null-terminated) @buf string, zero if
+ * nothing is copied.
+ */
+static inline ssize_t
+cpumap_print_to_pagebuf(bool list, char *buf, const struct cpumask *mask)
+{
+ return bitmap_print_to_pagebuf(list, buf, cpumask_bits(mask),
+ nr_cpumask_bits);
+}
+
/*
*
* From here down, all obsolete. Use cpumask_ variants!
diff --git a/lib/bitmap.c b/lib/bitmap.c
index 1e031f2c9aba..0a9f39388c63 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -12,6 +12,8 @@
#include <linux/bitmap.h>
#include <linux/bitops.h>
#include <linux/bug.h>
+
+#include <asm/page.h>
#include <asm/uaccess.h>
/*
@@ -580,6 +582,33 @@ int bitmap_scnlistprintf(char *buf, unsigned int buflen,
EXPORT_SYMBOL(bitmap_scnlistprintf);
/**
+ * bitmap_print_to_pagebuf - convert bitmap to list or hex format ASCII string
+ * @list: indicates whether the bitmap must be list
+ * @buf: page aligned buffer into which string is placed
+ * @maskp: pointer to bitmap to convert
+ * @nmaskbits: size of bitmap, in bits
+ *
+ * Output format is a comma-separated list of decimal numbers and
+ * ranges if list is specified or hex digits grouped into comma-separated
+ * sets of 8 digits/set. Returns the number of characters written to buf.
+ */
+int bitmap_print_to_pagebuf(bool list, char *buf, const unsigned long *maskp,
+ int nmaskbits)
+{
+ ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf - 2;
+ int n = 0;
+
+ if (len > 1) {
+ n = list ? bitmap_scnlistprintf(buf, len, maskp, nmaskbits) :
+ bitmap_scnprintf(buf, len, maskp, nmaskbits);
+ buf[n++] = '\n';
+ buf[n] = '\0';
+ }
+ return n;
+}
+EXPORT_SYMBOL(bitmap_print_to_pagebuf);
+
+/**
* __bitmap_parselist - convert list format ASCII string to bitmap
* @buf: read nul-terminated user string from this buffer
* @buflen: buffer size in bytes. If string is smaller than this
--
1.9.1
--
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