mirror of https://gitee.com/openkylin/linux.git
topology: use bin_attribute to break the size limitation of cpumap ABI
Reading /sys/devices/system/cpu/cpuX/topology/ returns cpu topology. However, the size of this file is limited to PAGE_SIZE because of the limitation for sysfs attribute. This patch moves to use bin_attribute to extend the ABI to be more than one page so that cpumap bitmask and list won't be potentially trimmed. Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: "Rafael J. Wysocki" <rafael@kernel.org> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Tian Tao <tiantao6@hisilicon.com> Signed-off-by: Barry Song <song.bao.hua@hisilicon.com> Link: https://lore.kernel.org/r/20210806110251.560-4-song.bao.hua@hisilicon.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -21,25 +21,27 @@ static ssize_t name##_show(struct device *dev, \
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return sysfs_emit(buf, "%d\n", topology_##name(dev->id)); \
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}
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#define define_siblings_show_map(name, mask) \
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static ssize_t name##_show(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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return cpumap_print_to_pagebuf(false, buf, topology_##mask(dev->id));\
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#define define_siblings_read_func(name, mask) \
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static ssize_t name##_read(struct file *file, struct kobject *kobj, \
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struct bin_attribute *attr, char *buf, \
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loff_t off, size_t count) \
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{ \
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struct device *dev = kobj_to_dev(kobj); \
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\
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return cpumap_print_bitmask_to_buf(buf, topology_##mask(dev->id), \
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off, count); \
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} \
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\
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static ssize_t name##_list_read(struct file *file, struct kobject *kobj, \
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struct bin_attribute *attr, char *buf, \
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loff_t off, size_t count) \
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{ \
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struct device *dev = kobj_to_dev(kobj); \
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\
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return cpumap_print_list_to_buf(buf, topology_##mask(dev->id), \
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off, count); \
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}
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#define define_siblings_show_list(name, mask) \
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static ssize_t name##_list_show(struct device *dev, \
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struct device_attribute *attr, \
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char *buf) \
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{ \
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return cpumap_print_to_pagebuf(true, buf, topology_##mask(dev->id));\
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}
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#define define_siblings_show_func(name, mask) \
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define_siblings_show_map(name, mask); \
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define_siblings_show_list(name, mask)
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define_id_show_func(physical_package_id);
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static DEVICE_ATTR_RO(physical_package_id);
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@ -49,71 +51,80 @@ static DEVICE_ATTR_RO(die_id);
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define_id_show_func(core_id);
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static DEVICE_ATTR_RO(core_id);
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define_siblings_show_func(thread_siblings, sibling_cpumask);
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static DEVICE_ATTR_RO(thread_siblings);
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static DEVICE_ATTR_RO(thread_siblings_list);
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define_siblings_read_func(thread_siblings, sibling_cpumask);
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static BIN_ATTR_RO(thread_siblings, 0);
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static BIN_ATTR_RO(thread_siblings_list, 0);
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define_siblings_show_func(core_cpus, sibling_cpumask);
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static DEVICE_ATTR_RO(core_cpus);
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static DEVICE_ATTR_RO(core_cpus_list);
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define_siblings_read_func(core_cpus, sibling_cpumask);
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static BIN_ATTR_RO(core_cpus, 0);
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static BIN_ATTR_RO(core_cpus_list, 0);
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define_siblings_show_func(core_siblings, core_cpumask);
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static DEVICE_ATTR_RO(core_siblings);
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static DEVICE_ATTR_RO(core_siblings_list);
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define_siblings_read_func(core_siblings, core_cpumask);
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static BIN_ATTR_RO(core_siblings, 0);
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static BIN_ATTR_RO(core_siblings_list, 0);
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define_siblings_show_func(die_cpus, die_cpumask);
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static DEVICE_ATTR_RO(die_cpus);
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static DEVICE_ATTR_RO(die_cpus_list);
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define_siblings_read_func(die_cpus, die_cpumask);
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static BIN_ATTR_RO(die_cpus, 0);
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static BIN_ATTR_RO(die_cpus_list, 0);
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define_siblings_show_func(package_cpus, core_cpumask);
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static DEVICE_ATTR_RO(package_cpus);
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static DEVICE_ATTR_RO(package_cpus_list);
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define_siblings_read_func(package_cpus, core_cpumask);
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static BIN_ATTR_RO(package_cpus, 0);
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static BIN_ATTR_RO(package_cpus_list, 0);
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#ifdef CONFIG_SCHED_BOOK
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define_id_show_func(book_id);
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static DEVICE_ATTR_RO(book_id);
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define_siblings_show_func(book_siblings, book_cpumask);
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static DEVICE_ATTR_RO(book_siblings);
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static DEVICE_ATTR_RO(book_siblings_list);
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define_siblings_read_func(book_siblings, book_cpumask);
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static BIN_ATTR_RO(book_siblings, 0);
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static BIN_ATTR_RO(book_siblings_list, 0);
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#endif
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#ifdef CONFIG_SCHED_DRAWER
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define_id_show_func(drawer_id);
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static DEVICE_ATTR_RO(drawer_id);
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define_siblings_show_func(drawer_siblings, drawer_cpumask);
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static DEVICE_ATTR_RO(drawer_siblings);
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static DEVICE_ATTR_RO(drawer_siblings_list);
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define_siblings_read_func(drawer_siblings, drawer_cpumask);
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static BIN_ATTR_RO(drawer_siblings, 0);
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static BIN_ATTR_RO(drawer_siblings_list, 0);
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#endif
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static struct bin_attribute *bin_attrs[] = {
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&bin_attr_core_cpus,
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&bin_attr_core_cpus_list,
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&bin_attr_thread_siblings,
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&bin_attr_thread_siblings_list,
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&bin_attr_core_siblings,
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&bin_attr_core_siblings_list,
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&bin_attr_die_cpus,
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&bin_attr_die_cpus_list,
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&bin_attr_package_cpus,
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&bin_attr_package_cpus_list,
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#ifdef CONFIG_SCHED_BOOK
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&bin_attr_book_siblings,
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&bin_attr_book_siblings_list,
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#endif
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#ifdef CONFIG_SCHED_DRAWER
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&bin_attr_drawer_siblings,
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&bin_attr_drawer_siblings_list,
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#endif
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NULL
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};
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static struct attribute *default_attrs[] = {
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&dev_attr_physical_package_id.attr,
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&dev_attr_die_id.attr,
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&dev_attr_core_id.attr,
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&dev_attr_thread_siblings.attr,
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&dev_attr_thread_siblings_list.attr,
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&dev_attr_core_cpus.attr,
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&dev_attr_core_cpus_list.attr,
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&dev_attr_core_siblings.attr,
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&dev_attr_core_siblings_list.attr,
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&dev_attr_die_cpus.attr,
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&dev_attr_die_cpus_list.attr,
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&dev_attr_package_cpus.attr,
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&dev_attr_package_cpus_list.attr,
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#ifdef CONFIG_SCHED_BOOK
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&dev_attr_book_id.attr,
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&dev_attr_book_siblings.attr,
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&dev_attr_book_siblings_list.attr,
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#endif
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#ifdef CONFIG_SCHED_DRAWER
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&dev_attr_drawer_id.attr,
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&dev_attr_drawer_siblings.attr,
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&dev_attr_drawer_siblings_list.attr,
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#endif
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NULL
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};
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static const struct attribute_group topology_attr_group = {
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.attrs = default_attrs,
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.bin_attrs = bin_attrs,
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.name = "topology"
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};
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