From aeab199d84c2616ffc5e29aa4831bd8a660bde96 Mon Sep 17 00:00:00 2001 From: Sukadev Bhattiprolu Date: Mon, 30 Mar 2015 18:53:47 -0700 Subject: [PATCH] powerpc/perf/hv-24x7: Break up single_24x7_request Break up the function single_24x7_request() into smaller functions. This would later enable us to "prepare" a multi-event request buffer and then submit a single hcall for several events. Signed-off-by: Sukadev Bhattiprolu Signed-off-by: Michael Ellerman --- arch/powerpc/perf/hv-24x7.c | 56 +++++++++++++++++++++++++++++++++------------ 1 file changed, 42 insertions(+), 14 deletions(-) diff --git a/arch/powerpc/perf/hv-24x7.c b/arch/powerpc/perf/hv-24x7.c index cf82026..46be032 100644 --- a/arch/powerpc/perf/hv-24x7.c +++ b/arch/powerpc/perf/hv-24x7.c @@ -1003,6 +1003,44 @@ static void log_24x7_hcall(struct hv_24x7_request_buffer *request_buffer, } /* + * Start the process for a new H_GET_24x7_DATA hcall. + */ +static void init_24x7_request(struct hv_24x7_request_buffer *request_buffer, + struct hv_24x7_data_result_buffer *result_buffer) +{ + + memset(request_buffer, 0, 4096); + memset(result_buffer, 0, 4096); + + request_buffer->interface_version = HV_24X7_IF_VERSION_CURRENT; + /* memset above set request_buffer->num_requests to 0 */ +} + +/* + * Commit (i.e perform) the H_GET_24x7_DATA hcall using the data collected + * by 'init_24x7_request()' and 'add_event_to_24x7_request()'. + */ +static int make_24x7_request(struct hv_24x7_request_buffer *request_buffer, + struct hv_24x7_data_result_buffer *result_buffer) +{ + unsigned long ret; + + /* + * NOTE: Due to variable number of array elements in request and + * result buffer(s), sizeof() is not reliable. Use the actual + * allocated buffer size, H24x7_DATA_BUFFER_SIZE. + */ + ret = plpar_hcall_norets(H_GET_24X7_DATA, + virt_to_phys(request_buffer), H24x7_DATA_BUFFER_SIZE, + virt_to_phys(result_buffer), H24x7_DATA_BUFFER_SIZE); + + if (ret) + log_24x7_hcall(request_buffer, result_buffer, ret); + + return ret; +} + +/* * Add the given @event to the next slot in the 24x7 request_buffer. * * Note that H_GET_24X7_DATA hcall allows reading several counters' @@ -1044,7 +1082,6 @@ static int add_event_to_24x7_request(struct perf_event *event, static unsigned long single_24x7_request(struct perf_event *event, u64 *count) { unsigned long ret; - struct hv_24x7_request_buffer *request_buffer; struct hv_24x7_data_result_buffer *result_buffer; struct hv_24x7_result *resb; @@ -1055,31 +1092,22 @@ static unsigned long single_24x7_request(struct perf_event *event, u64 *count) request_buffer = (void *)get_cpu_var(hv_24x7_reqb); result_buffer = (void *)get_cpu_var(hv_24x7_resb); - memset(request_buffer, 0, 4096); - memset(result_buffer, 0, 4096); - - request_buffer->interface_version = HV_24X7_IF_VERSION_CURRENT; + init_24x7_request(request_buffer, result_buffer); ret = add_event_to_24x7_request(event, request_buffer); if (ret) return ret; - /* - * NOTE: Due to variable number of array elements in request and - * result buffer(s), sizeof() is not reliable. Use the actual - * allocated buffer size, H24x7_DATA_BUFFER_SIZE. - */ - ret = plpar_hcall_norets(H_GET_24X7_DATA, - virt_to_phys(request_buffer), H24x7_DATA_BUFFER_SIZE, - virt_to_phys(result_buffer), H24x7_DATA_BUFFER_SIZE); - + ret = make_24x7_request(request_buffer, result_buffer); if (ret) { log_24x7_hcall(request_buffer, result_buffer, ret); goto out; } + /* process result from hcall */ resb = &result_buffer->results[0]; *count = be64_to_cpu(resb->elements[0].element_data[0]); + out: return ret; } -- 2.7.4