/* * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas. * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sub license, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice (including the * next paragraph) shall be included in all copies or substantial portions * of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. * */ #ifndef _I915_DRM_H_ #define _I915_DRM_H_ #include <drm/i915_pciids.h> #include <uapi/drm/i915_drm.h> /* For use by IPS driver */ extern unsigned long i915_read_mch_val(void); extern bool i915_gpu_raise(void); extern bool i915_gpu_lower(void); extern bool i915_gpu_busy(void); extern bool i915_gpu_turbo_disable(void); /* * The Bridge device's PCI config space has information about the * fb aperture size and the amount of pre-reserved memory. * This is all handled in the intel-gtt.ko module. i915.ko only * cares about the vga bit for the vga rbiter. */ #define INTEL_GMCH_CTRL 0x52 #define INTEL_GMCH_VGA_DISABLE (1 << 1) #define SNB_GMCH_CTRL 0x50 #define SNB_GMCH_GGMS_SHIFT 8 /* GTT Graphics Memory Size */ #define SNB_GMCH_GGMS_MASK 0x3 #define SNB_GMCH_GMS_SHIFT 3 /* Graphics Mode Select */ #define SNB_GMCH_GMS_MASK 0x1f #define BDW_GMCH_GGMS_SHIFT 6 #define BDW_GMCH_GGMS_MASK 0x3 #define BDW_GMCH_GMS_SHIFT 8 #define BDW_GMCH_GMS_MASK 0xff #define I830_GMCH_CTRL 0x52 #define I830_GMCH_GMS_MASK 0x70 #define I830_GMCH_GMS_LOCAL 0x10 #define I830_GMCH_GMS_STOLEN_512 0x20 #define I830_GMCH_GMS_STOLEN_1024 0x30 #define I830_GMCH_GMS_STOLEN_8192 0x40 #define I855_GMCH_GMS_MASK 0xF0 #define I855_GMCH_GMS_STOLEN_0M 0x0 #define I855_GMCH_GMS_STOLEN_1M (0x1 << 4) #define I855_GMCH_GMS_STOLEN_4M (0x2 << 4) #define I855_GMCH_GMS_STOLEN_8M (0x3 << 4) #define I855_GMCH_GMS_STOLEN_16M (0x4 << 4) #define I855_GMCH_GMS_STOLEN_32M (0x5 << 4) #define I915_GMCH_GMS_STOLEN_48M (0x6 << 4) #define I915_GMCH_GMS_STOLEN_64M (0x7 << 4) #define G33_GMCH_GMS_STOLEN_128M (0x8 << 4) #define G33_GMCH_GMS_STOLEN_256M (0x9 << 4) #define INTEL_GMCH_GMS_STOLEN_96M (0xa << 4) #define INTEL_GMCH_GMS_STOLEN_160M (0xb << 4) #define INTEL_GMCH_GMS_STOLEN_224M (0xc << 4) #define INTEL_GMCH_GMS_STOLEN_352M (0xd << 4) #define I830_DRB3 0x63 #define I85X_DRB3 0x43 #define I865_TOUD 0xc4 #define I830_ESMRAMC 0x91 #define I845_ESMRAMC 0x9e #define I85X_ESMRAMC 0x61 #define TSEG_ENABLE (1 << 0) #define I830_TSEG_SIZE_512K (0 << 1) #define I830_TSEG_SIZE_1M (1 << 1) #define I845_TSEG_SIZE_MASK (3 << 1) #define I845_TSEG_SIZE_512K (2 << 1) #define I845_TSEG_SIZE_1M (3 << 1) #define INTEL_BSM 0x5c #define INTEL_BSM_MASK (-(1u << 20)) #endif /* _I915_DRM_H_ */ ?h=nds-private-remove&id=966d2b04e070bc040319aaebfec09e0144dc3341'>ulpqueue.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='966d2b04e070bc040319aaebfec09e0144dc3341'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' 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summary='commit info' class='commit-info'> <tr><th>author</th><td>Douglas Miller <dougmill@linux.vnet.ibm.com></td><td class='right'>2017-01-28 06:42:20 -0600</td></tr> <tr><th>committer</th><td>Tejun Heo <tj@kernel.org></td><td class='right'>2017-01-28 07:49:42 -0500</td></tr> <tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/net/sctp/ulpqueue.h?h=nds-private-remove&id=966d2b04e070bc040319aaebfec09e0144dc3341'>966d2b04e070bc040319aaebfec09e0144dc3341</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/net/sctp/ulpqueue.h?id=966d2b04e070bc040319aaebfec09e0144dc3341'>patch</a>)</td></tr> <tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&id=966d2b04e070bc040319aaebfec09e0144dc3341'>4b96156e3d1dd4dfd6039b7c219c9dc4616da52d</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/net/sctp/ulpqueue.h?h=nds-private-remove&id=966d2b04e070bc040319aaebfec09e0144dc3341'>include/net/sctp/ulpqueue.h</a></td></tr> <tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/net/sctp/ulpqueue.h?h=nds-private-remove&id=1b1bc42c1692e9b62756323c675a44cb1a1f9dbd'>1b1bc42c1692e9b62756323c675a44cb1a1f9dbd</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/net/sctp/ulpqueue.h?h=nds-private-remove&id=966d2b04e070bc040319aaebfec09e0144dc3341&id2=1b1bc42c1692e9b62756323c675a44cb1a1f9dbd'>diff</a>)</td></tr></table> <div class='commit-subject'>percpu-refcount: fix reference leak during percpu-atomic transition</div><div class='commit-msg'>percpu_ref_tryget() and percpu_ref_tryget_live() should return "true" IFF they acquire a reference. But the return value from atomic_long_inc_not_zero() is a long and may have high bits set, e.g. PERCPU_COUNT_BIAS, and the return value of the tryget routines is bool so the reference may actually be acquired but the routines return "false" which results in a reference leak since the caller assumes it does not need to do a corresponding percpu_ref_put(). This was seen when performing CPU hotplug during I/O, as hangs in blk_mq_freeze_queue_wait where percpu_ref_kill (blk_mq_freeze_queue_start) raced with percpu_ref_tryget (blk_mq_timeout_work). Sample stack trace: __switch_to+0x2c0/0x450 __schedule+0x2f8/0x970 schedule+0x48/0xc0 blk_mq_freeze_queue_wait+0x94/0x120 blk_mq_queue_reinit_work+0xb8/0x180 blk_mq_queue_reinit_prepare+0x84/0xa0 cpuhp_invoke_callback+0x17c/0x600 cpuhp_up_callbacks+0x58/0x150 _cpu_up+0xf0/0x1c0 do_cpu_up+0x120/0x150 cpu_subsys_online+0x64/0xe0 device_online+0xb4/0x120 online_store+0xb4/0xc0 dev_attr_store+0x68/0xa0 sysfs_kf_write+0x80/0xb0 kernfs_fop_write+0x17c/0x250 __vfs_write+0x6c/0x1e0 vfs_write+0xd0/0x270 SyS_write+0x6c/0x110 system_call+0x38/0xe0 Examination of the queue showed a single reference (no PERCPU_COUNT_BIAS, and __PERCPU_REF_DEAD, __PERCPU_REF_ATOMIC set) and no requests. However, conditions at the time of the race are count of PERCPU_COUNT_BIAS + 0 and __PERCPU_REF_DEAD and __PERCPU_REF_ATOMIC set. The fix is to make the tryget routines use an actual boolean internally instead of the atomic long result truncated to a int. Fixes: e625305b3907 percpu-refcount: make percpu_ref based on longs instead of ints Link: https://bugzilla.kernel.org/show_bug.cgi?id=190751 Signed-off-by: Douglas Miller <dougmill@linux.vnet.ibm.com> Reviewed-by: Jens Axboe <axboe@fb.com> Signed-off-by: Tejun Heo <tj@kernel.org> Fixes: e625305b3907 ("percpu-refcount: make percpu_ref based on longs instead of ints") Cc: stable@vger.kernel.org # v3.18+ </div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&id=966d2b04e070bc040319aaebfec09e0144dc3341'>Diffstat</a> (limited to 'include/net/sctp/ulpqueue.h')</div><table summary='diffstat' class='diffstat'>