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Date: Wed, 03 Sep 2014 23:46:29 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Sudeep Holla <sudeep.holla@....com>
Cc: LKML <linux-kernel@...r.kernel.org>,
Heiko Carstens <heiko.carstens@...ibm.com>,
Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Bjorn Helgaas <bhelgaas@...gle.com>, x86@...nel.org,
linux-acpi@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH v4 01/11] cpumask: factor out show_cpumap into separate helper function
On Wednesday, September 03, 2014 06:00:07 PM Sudeep Holla wrote:
> From: Sudeep Holla <sudeep.holla@....com>
>
> 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_copy_to_buf in
> cpumask.h and consolidates most of them using this new helper.
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com> for the ACPI PAD
part.
Thanks!
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> Suggested-by: Stephen Boyd <sboyd@...eaurora.org>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> Cc: x86@...nel.org
> Cc: linux-acpi@...r.kernel.org
> Cc: linux-pci@...r.kernel.org
> ---
> 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 | 6 +----
> drivers/base/cpu.c | 5 +---
> drivers/base/node.c | 14 +++-------
> drivers/base/topology.c | 22 ++-------------
> drivers/pci/pci-sysfs.c | 39 +++++++--------------------
> include/linux/cpumask.h | 27 +++++++++++++++++++
> 10 files changed, 49 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..61a670de0ef2 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_copy_to_buf(true, &iommu_cpumask, buf);
> }
> 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..d96a37ed8570 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_copy_to_buf(true, active_mask, buf);
> }
> 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..8a673e138e2e 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_copy_to_buf(true, &rapl_cpu_mask, buf);
> }
>
> 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..a0b810951743 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_copy_to_buf(true, &uncore_cpu_mask, buf);
> }
>
> 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..0dbe52ed6a0d 100644
> --- a/drivers/acpi/acpi_pad.c
> +++ b/drivers/acpi/acpi_pad.c
> @@ -350,11 +350,7 @@ 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_copy_to_buf(false, to_cpumask(pad_busy_cpus_bits), buf);
> }
> static DEVICE_ATTR(idlecpus, S_IRUGO|S_IWUSR,
> acpi_pad_idlecpus_show,
> diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
> index 006b1bc5297d..277a9cfa9040 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_copy_to_buf(true, *ca->map, buf);
> }
>
> #define _CPU_ATTR(name, map) \
> diff --git a/drivers/base/node.c b/drivers/base/node.c
> index c6d3ae05f1ca..6e58ad566c13 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_copy_to_buf(list, mask, buf);
> }
>
> 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..39b294bd769b 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_copy_to_buf(false, topology_##name(dev->id), buf);\
> }
>
> #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_copy_to_buf(true, topology_##name(dev->id), buf); \
> }
>
> #define define_siblings_show_func(name) \
> diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
> index 9ff0a901ecf7..aa0f1359ef30 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_copy_to_buf(list, mask, buf);
> }
>
> 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_copy_to_buf(false, cpumask, buf);
> }
> 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_copy_to_buf(true, cpumask, buf);
> }
> static DEVICE_ATTR_RO(cpulistaffinity);
>
> diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
> index 2997af6d2ccd..26d8348292dd 100644
> --- a/include/linux/cpumask.h
> +++ b/include/linux/cpumask.h
> @@ -11,6 +11,8 @@
> #include <linux/bitmap.h>
> #include <linux/bug.h>
>
> +#include <asm/page.h>
> +
> typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;
>
> /**
> @@ -792,6 +794,31 @@ static inline const struct cpumask *get_cpu_mask(unsigned int cpu)
> }
> #endif /* NR_CPUS > BITS_PER_LONG */
>
> +/**
> + * cpumap_copy_to_buf - 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_copy_to_buf(bool list, const struct cpumask *mask, char *buf)
> +{
> + ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf - 2;
> + int n = 0;
> +
> + if (len > 1) {
> + n = list ? cpulist_scnprintf(buf, len, mask) :
> + cpumask_scnprintf(buf, len, mask);
> + buf[n++] = '\n';
> + buf[n] = '\0';
> + }
> + return n;
> +}
> +
> /*
> *
> * From here down, all obsolete. Use cpumask_ variants!
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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