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author | Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> | 2015-03-30 18:53:44 -0700 |
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committer | Michael Ellerman <mpe@ellerman.id.au> | 2015-04-11 20:49:25 +1000 |
commit | e3ee15dc5d19d060012d0a89b085d56e50d40a2b (patch) | |
tree | 19fffede700c05a8cb492b6efbfe846b4698c65a /arch/powerpc/perf | |
parent | 33ba14c0d8ff64d51adb543f689cde7a9a227cd8 (diff) | |
download | linux-e3ee15dc5d19d060012d0a89b085d56e50d40a2b.tar.gz linux-e3ee15dc5d19d060012d0a89b085d56e50d40a2b.tar.bz2 linux-e3ee15dc5d19d060012d0a89b085d56e50d40a2b.zip |
powerpc/perf/hv-24x7: Define add_event_to_24x7_request()
Move code that maps a perf_event to a 24x7 request buffer into a
separate function, add_event_to_24x7_request().
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/perf')
-rw-r--r-- | arch/powerpc/perf/hv-24x7.c | 59 |
1 files changed, 42 insertions, 17 deletions
diff --git a/arch/powerpc/perf/hv-24x7.c b/arch/powerpc/perf/hv-24x7.c index e78b1272aa0e..fe74221a35ff 100644 --- a/arch/powerpc/perf/hv-24x7.c +++ b/arch/powerpc/perf/hv-24x7.c @@ -1000,15 +1000,52 @@ static void log_24x7_hcall(struct hv_24x7_request_buffer *request_buffer, result_buffer->failing_request_ix); } -static unsigned long single_24x7_request(struct perf_event *event, u64 *count) +/* + * Add the given @event to the next slot in the 24x7 request_buffer. + * + * Note that H_GET_24X7_DATA hcall allows reading several counters' + * values in a single HCALL. We expect the caller to add events to the + * request buffer one by one, make the HCALL and process the results. + */ +static int add_event_to_24x7_request(struct perf_event *event, + struct hv_24x7_request_buffer *request_buffer) { u16 idx; + int i; + struct hv_24x7_request *req; + + if (request_buffer->num_requests > 254) { + pr_devel("Too many requests for 24x7 HCALL %d\n", + request_buffer->num_requests); + return -EINVAL; + } + + if (is_physical_domain(event_get_domain(event))) + idx = event_get_core(event); + else + idx = event_get_vcpu(event); + + i = request_buffer->num_requests++; + req = &request_buffer->requests[i]; + + req->performance_domain = event_get_domain(event); + req->data_size = cpu_to_be16(8); + req->data_offset = cpu_to_be32(event_get_offset(event)); + req->starting_lpar_ix = cpu_to_be16(event_get_lpar(event)), + req->max_num_lpars = cpu_to_be16(1); + req->starting_ix = cpu_to_be16(idx); + req->max_ix = cpu_to_be16(1); + + return 0; +} + +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; - struct hv_24x7_request *req; BUILD_BUG_ON(sizeof(*request_buffer) > 4096); BUILD_BUG_ON(sizeof(*result_buffer) > 4096); @@ -1019,23 +1056,11 @@ static unsigned long single_24x7_request(struct perf_event *event, u64 *count) memset(request_buffer, 0, 4096); memset(result_buffer, 0, 4096); - if (is_physical_domain(event_get_domain(event))) - idx = event_get_core(event); - else - idx = event_get_vcpu(event); - request_buffer->interface_version = HV_24X7_IF_VERSION_CURRENT; - request_buffer->num_requests = 1; - - req = &request_buffer->requests[0]; - req->performance_domain = event_get_domain(event); - req->data_size = cpu_to_be16(8); - req->data_offset = cpu_to_be32(event_get_offset(event)); - req->starting_lpar_ix = cpu_to_be16(event_get_lpar(event)), - req->max_num_lpars = cpu_to_be16(1); - req->starting_ix = cpu_to_be16(idx); - req->max_ix = cpu_to_be16(1); + ret = add_event_to_24x7_request(event, request_buffer); + if (ret) + return ret; /* * NOTE: Due to variable number of array elements in request and |