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path: root/include/trace/events/swiotlb.h
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#undef TRACE_SYSTEM
#define TRACE_SYSTEM swiotlb

#if !defined(_TRACE_SWIOTLB_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_SWIOTLB_H

#include <linux/tracepoint.h>

TRACE_EVENT(swiotlb_bounced,

	TP_PROTO(struct device *dev,
		 dma_addr_t dev_addr,
		 size_t size,
		 enum swiotlb_force swiotlb_force),

	TP_ARGS(dev, dev_addr, size, swiotlb_force),

	TP_STRUCT__entry(
		__string(	dev_name,	dev_name(dev)		)
		__field(	u64,	dma_mask			)
		__field(	dma_addr_t,	dev_addr		)
		__field(	size_t,	size				)
		__field(	enum swiotlb_force,	swiotlb_force	)
	),

	TP_fast_assign(
		__assign_str(dev_name, dev_name(dev));
		__entry->dma_mask = (dev->dma_mask ? *dev->dma_mask : 0);
		__entry->dev_addr = dev_addr;
		__entry->size = size;
		__entry->swiotlb_force = swiotlb_force;
	),

	TP_printk("dev_name: %s dma_mask=%llx dev_addr=%llx "
		"size=%zu %s",
		__get_str(dev_name),
		__entry->dma_mask,
		(unsigned long long)__entry->dev_addr,
		__entry->size,
		__print_symbolic(__entry->swiotlb_force,
			{ SWIOTLB_NORMAL,	"NORMAL" },
			{ SWIOTLB_FORCE,	"FORCE" },
			{ SWIOTLB_NO_FORCE,	"NO_FORCE" }))
);

#endif /*  _TRACE_SWIOTLB_H */

/* This part must be outside protection */
#include <trace/define_trace.h>
pu_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+
Diffstat (limited to 'include/dt-bindings/reset/qcom,mmcc-apq8084.h')