powerpc/perf/hv-24x7: Minor improvements

There's an H24x7_DATA_BUFFER_SIZE constant, so use it in init_24x7_request.

There's also an HV_PERF_DOMAIN_MAX constant, so use it in
h_24x7_event_init. This makes the comment above the check redundant,
so remove it.

In add_event_to_24x7_request, a statement is terminated with a comma
instead of a semicolon. Fix it.

In hv-24x7.h, improve comments in struct hv_24x7_result.
Signed-off-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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

@@ -1049,8 +1049,8 @@ 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);
+	memset(request_buffer, 0, H24x7_DATA_BUFFER_SIZE);
+	memset(result_buffer, 0, H24x7_DATA_BUFFER_SIZE);
 
 	request_buffer->interface_version = HV_24X7_IF_VERSION_CURRENT;
 	/* memset above set request_buffer->num_requests to 0 */
@@ -1126,7 +1126,7 @@ static int add_event_to_24x7_request(struct perf_event *event,
 	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->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);
@@ -1218,9 +1218,8 @@ static int h_24x7_event_init(struct perf_event *event)
 		return -EINVAL;
 	}
 
-	/* Domains above 6 are invalid */
 	domain = event_get_domain(event);
-	if (domain > 6) {
+	if (domain >= HV_PERF_DOMAIN_MAX) {
 		pr_devel("invalid domain %d\n", domain);
 		return -EINVAL;
 	}

arch/powerpc/perf/hv-24x7.h

@@ -71,6 +71,10 @@ struct hv_24x7_result_element {
 } __packed;
 
 struct hv_24x7_result {
+	/*
+	 * The index of the 24x7 Request Structure in the 24x7 Request Buffer
+	 * used to request this result.
+	 */
 	__u8 result_ix;
 
 	/*
@@ -81,7 +85,12 @@ struct hv_24x7_result {
 	__u8 results_complete;
 	__be16 num_elements_returned;
 
-	/* This is a copy of @data_size from the corresponding hv_24x7_request */
+	/*
+	 * This is a copy of @data_size from the corresponding hv_24x7_request
+	 *
+	 * Warning: to obtain the size of each element in @elements you have
+	 * to add the size of the other members of the result_element struct.
+	 */
 	__be16 result_element_data_size;
 	__u8 reserved[0x2];