/* * linux/fs/hfs/attr.c * * (C) 2003 Ardis Technologies * * Export hfs data via xattr */ #include #include #include "hfs_fs.h" #include "btree.h" enum hfs_xattr_type { HFS_TYPE, HFS_CREATOR, }; static int __hfs_setxattr(struct inode *inode, enum hfs_xattr_type type, const void *value, size_t size, int flags) { struct hfs_find_data fd; hfs_cat_rec rec; struct hfs_cat_file *file; int res; if (!S_ISREG(inode->i_mode) || HFS_IS_RSRC(inode)) return -EOPNOTSUPP; res = hfs_find_init(HFS_SB(inode->i_sb)->cat_tree, &fd); if (res) return res; fd.search_key->cat = HFS_I(inode)->cat_key; res = hfs_brec_find(&fd); if (res) goto out; hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, sizeof(struct hfs_cat_file)); file = &rec.file; switch (type) { case HFS_TYPE: if (size == 4) memcpy(&file->UsrWds.fdType, value, 4); else res = -ERANGE; break; case HFS_CREATOR: if (size == 4) memcpy(&file->UsrWds.fdCreator, value, 4); else res = -ERANGE; break; } if (!res) hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, sizeof(struct hfs_cat_file)); out: hfs_find_exit(&fd); return res; } static ssize_t __hfs_getxattr(struct inode *inode, enum hfs_xattr_type type, void *value, size_t size) { struct hfs_find_data fd; hfs_cat_rec rec; struct hfs_cat_file *file; ssize_t res = 0; if (!S_ISREG(inode->i_mode) || HFS_IS_RSRC(inode)) return -EOPNOTSUPP; if (size) { res = hfs_find_init(HFS_SB(inode->i_sb)->cat_tree, &fd); if (res) return res; fd.search_key->cat = HFS_I(inode)->cat_key; res = hfs_brec_find(&fd); if (res) goto out; hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, sizeof(struct hfs_cat_file)); } file = &rec.file; switch (type) { case HFS_TYPE: if (size >= 4) { memcpy(value, &file->UsrWds.fdType, 4); res = 4; } else res = size ? -ERANGE : 4; break; case HFS_CREATOR: if (size >= 4) { memcpy(value, &file->UsrWds.fdCreator, 4); res = 4; } else res = size ? -ERANGE : 4; break; } out: if (size) hfs_find_exit(&fd); return res; } static int hfs_xattr_get(const struct xattr_handler *handler, struct dentry *unused, struct inode *inode, const char *name, void *value, size_t size) { return __hfs_getxattr(inode, handler->flags, value, size); } static int hfs_xattr_set(const struct xattr_handler *handler, struct dentry *unused, struct inode *inode, const char *name, const void *value, size_t size, int flags) { if (!value) return -EOPNOTSUPP; return __hfs_setxattr(inode, handler->flags, value, size, flags); } static const struct xattr_handler hfs_creator_handler = { .name = "hfs.creator", .flags = HFS_CREATOR, .get = hfs_xattr_get, .set = hfs_xattr_set, }; static const struct xattr_handler hfs_type_handler = { .name = "hfs.type", .flags = HFS_TYPE, .get = hfs_xattr_get, .set = hfs_xattr_set, }; const struct xattr_handler *hfs_xattr_handlers[] = { &hfs_creator_handler, &hfs_type_handler, NULL }; db9f6e71b24440b5f1d93e968ee3'>net/nfc/nci
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authorSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>2017-02-03 14:18:39 -0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-02-04 00:11:08 +0100
commit6e978b22efa1db9f6e71b24440b5f1d93e968ee3 (patch)
treec666f7a26b860674848949e39a610222b0723f89 /net/nfc/nci
parent3c223c19aea85d3dda1416c187915f4a30b04b1f (diff)
cpufreq: intel_pstate: Disable energy efficiency optimization
Some Kabylake desktop processors may not reach max turbo when running in HWP mode, even if running under sustained 100% utilization. This occurs when the HWP.EPP (Energy Performance Preference) is set to "balance_power" (0x80) -- the default on most systems. It occurs because the platform BIOS may erroneously enable an energy-efficiency setting -- MSR_IA32_POWER_CTL BIT-EE, which is not recommended to be enabled on this SKU. On the failing systems, this BIOS issue was not discovered when the desktop motherboard was tested with Windows, because the BIOS also neglects to provide the ACPI/CPPC table, that Windows requires to enable HWP, and so Windows runs in legacy P-state mode, where this setting has no effect. Linux' intel_pstate driver does not require ACPI/CPPC to enable HWP, and so it runs in HWP mode, exposing this incorrect BIOS configuration. There are several ways to address this problem. First, Linux can also run in legacy P-state mode on this system. As intel_pstate is how Linux enables HWP, booting with "intel_pstate=disable" will run in acpi-cpufreq/ondemand legacy p-state mode. Or second, the "performance" governor can be used with intel_pstate, which will modify HWP.EPP to 0. Or third, starting in 4.10, the /sys/devices/system/cpu/cpufreq/policy*/energy_performance_preference attribute in can be updated from "balance_power" to "performance". Or fourth, apply this patch, which fixes the erroneous setting of MSR_IA32_POWER_CTL BIT_EE on this model, allowing the default configuration to function as designed. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Reviewed-by: Len Brown <len.brown@intel.com> Cc: 4.6+ <stable@vger.kernel.org> # 4.6+ Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'net/nfc/nci')