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powerpc/perf/hv-24x7: Define add_event_to_24x7_request()

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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>
This commit is contained in:
Sukadev Bhattiprolu 2015-03-30 18:53:44 -07:00 committed by Michael Ellerman
parent 33ba14c0d8
commit e3ee15dc5d
1 changed files with 42 additions and 17 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

59
arch/powerpc/perf/hv-24x7.c
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@ -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