Re: [PATCH v4 7/9] iommu/vt-d: Add trace events for domain map/unmap

Steven Rostedt
2019-06-04T09:01:35Z

On Mon, 3 Jun 2019 09:16:18 +0800
Lu Baolu <baolu.lu@linux.intel.com> wrote:

> +TRACE_EVENT(bounce_unmap_single,
> + TP_PROTO(struct device *dev, dma_addr_t dev_addr, size_t size),
> +
> + TP_ARGS(dev, dev_addr, size),
> +
> + TP_STRUCT__entry(
> + __string(dev_name, dev_name(dev))
> + __field(dma_addr_t, dev_addr)
> + __field(size_t, size)
> + ),
> +
> + TP_fast_assign(
> + __assign_str(dev_name, dev_name(dev));
> + __entry->dev_addr = dev_addr;
> + __entry->size = size;
> + ),
> +
> + TP_printk("dev=%s dev_addr=0x%llx size=%zu",
> + __get_str(dev_name),
> + (unsigned long long)__entry->dev_addr,
> + __entry->size)
> +);
> +
> +TRACE_EVENT(bounce_map_sg,
> + TP_PROTO(struct device *dev, unsigned int i, unsigned int nelems,
> + dma_addr_t dev_addr, phys_addr_t phys_addr, size_t size),
> +
> + TP_ARGS(dev, i, nelems, dev_addr, phys_addr, size),
> +
> + TP_STRUCT__entry(
> + __string(dev_name, dev_name(dev))
> + __field(unsigned int, i)
> + __field(unsigned int, last)
> + __field(dma_addr_t, dev_addr)
> + __field(phys_addr_t, phys_addr)
> + __field(size_t, size)
> + ),
> +
> + TP_fast_assign(
> + __assign_str(dev_name, dev_name(dev));
> + __entry->i = i;
> + __entry->last = nelems - 1;
> + __entry->dev_addr = dev_addr;
> + __entry->phys_addr = phys_addr;
> + __entry->size = size;
> + ),
> +
> + TP_printk("dev=%s elem=%u/%u dev_addr=0x%llx phys_addr=0x%llx size=%zu",
> + __get_str(dev_name), __entry->i, __entry->last,
> + (unsigned long long)__entry->dev_addr,
> + (unsigned long long)__entry->phys_addr,
> + __entry->size)
> +);
> +
> +TRACE_EVENT(bounce_unmap_sg,
> + TP_PROTO(struct device *dev, unsigned int i, unsigned int nelems,
> + dma_addr_t dev_addr, phys_addr_t phys_addr, size_t size),
> +
> + TP_ARGS(dev, i, nelems, dev_addr, phys_addr, size),
> +
> + TP_STRUCT__entry(
> + __string(dev_name, dev_name(dev))
> + __field(unsigned int, i)
> + __field(unsigned int, last)
> + __field(dma_addr_t, dev_addr)
> + __field(phys_addr_t, phys_addr)
> + __field(size_t, size)
> + ),
> +
> + TP_fast_assign(
> + __assign_str(dev_name, dev_name(dev));
> + __entry->i = i;
> + __entry->last = nelems - 1;
> + __entry->dev_addr = dev_addr;
> + __entry->phys_addr = phys_addr;
> + __entry->size = size;
> + ),
> +
> + TP_printk("dev=%s elem=%u/%u dev_addr=0x%llx phys_addr=0x%llx size=%zu",
> + __get_str(dev_name), __entry->i, __entry->last,
> + (unsigned long long)__entry->dev_addr,
> + (unsigned long long)__entry->phys_addr,
> + __entry->size)
> +);

These last two events look identical. Please use the
DECLARE_EVENT_CLASS() to describe the event and then DEFINE_EVENT() for
the two events.

Each TRACE_EVENT() can add up to 5k of data/text, where as a
DEFINE_EVENT() just adds around 250 bytes.

(Note, a TRACE_EVENT() is defined as a
DECLARE_EVENT_CLASS()/DEFINE_EVENT() pair)

-- Steve

> +#endif /* _TRACE_INTEL_IOMMU_H */
> +
> +/* This part must be outside protection */
> +#include <trace/define_trace.h>