From 855ab61c16bf70b646fa9c84e7b07d14a003cd42 Mon Sep 17 00:00:00 2001 From: Mathieu Poirier Date: Thu, 25 Apr 2019 13:53:02 -0600 Subject: [PATCH] coresight: tmc-etr: Refactor function tmc_etr_setup_perf_buf() Refactoring function tmc_etr_setup_perf_buf() so that it only deals with the high level etr_perf_buffer, leaving the allocation of the backend buffer (i.e etr_buf) to another function. That way the backend buffer allocation function can decide if it wants to reuse an existing buffer (CPU-wide trace scenarios) or simply create a new one. Signed-off-by: Mathieu Poirier Tested-by: Leo Yan Tested-by: Robert Walker Signed-off-by: Greg Kroah-Hartman --- drivers/hwtracing/coresight/coresight-tmc-etr.c | 39 +++++++++++++++++++------ 1 file changed, 30 insertions(+), 9 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c index 55ee0ac..e1d2128 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -1160,29 +1160,24 @@ out: } /* - * tmc_etr_setup_perf_buf: Allocate ETR buffer for use by perf. + * alloc_etr_buf: Allocate ETR buffer for use by perf. * The size of the hardware buffer is dependent on the size configured * via sysfs and the perf ring buffer size. We prefer to allocate the * largest possible size, scaling down the size by half until it * reaches a minimum limit (1M), beyond which we give up. */ -static struct etr_perf_buffer * -tmc_etr_setup_perf_buf(struct tmc_drvdata *drvdata, struct perf_event *event, - int nr_pages, void **pages, bool snapshot) +static struct etr_buf * +alloc_etr_buf(struct tmc_drvdata *drvdata, struct perf_event *event, + int nr_pages, void **pages, bool snapshot) { int node, cpu = event->cpu; struct etr_buf *etr_buf; - struct etr_perf_buffer *etr_perf; unsigned long size; if (cpu == -1) cpu = smp_processor_id(); node = cpu_to_node(cpu); - etr_perf = kzalloc_node(sizeof(*etr_perf), GFP_KERNEL, node); - if (!etr_perf) - return ERR_PTR(-ENOMEM); - /* * Try to match the perf ring buffer size if it is larger * than the size requested via sysfs. @@ -1206,6 +1201,32 @@ tmc_etr_setup_perf_buf(struct tmc_drvdata *drvdata, struct perf_event *event, size /= 2; } while (size >= TMC_ETR_PERF_MIN_BUF_SIZE); + return ERR_PTR(-ENOMEM); + +done: + return etr_buf; +} + +static struct etr_perf_buffer * +tmc_etr_setup_perf_buf(struct tmc_drvdata *drvdata, struct perf_event *event, + int nr_pages, void **pages, bool snapshot) +{ + int node, cpu = event->cpu; + struct etr_buf *etr_buf; + struct etr_perf_buffer *etr_perf; + + if (cpu == -1) + cpu = smp_processor_id(); + node = cpu_to_node(cpu); + + etr_perf = kzalloc_node(sizeof(*etr_perf), GFP_KERNEL, node); + if (!etr_perf) + return ERR_PTR(-ENOMEM); + + etr_buf = alloc_etr_buf(drvdata, event, nr_pages, pages, snapshot); + if (!IS_ERR(etr_buf)) + goto done; + kfree(etr_perf); return ERR_PTR(-ENOMEM); -- 2.7.4