{
unsigned nl = be16_to_cpu(ev->event_name_len);
__be16 *desc_len = (__be16 *)(ev->remainder + nl - 2);
+
*len = be16_to_cpu(*desc_len) - 2;
return (char *)ev->remainder + nl;
}
__be16 *desc_len_ = (__be16 *)(ev->remainder + nl - 2);
unsigned desc_len = be16_to_cpu(*desc_len_);
__be16 *long_desc_len = (__be16 *)(ev->remainder + nl + desc_len - 2);
+
*len = be16_to_cpu(*long_desc_len) - 2;
return (char *)ev->remainder + nl + desc_len;
}
unsigned long index)
{
pr_devel("h_get_24x7_catalog_page(0x%lx, %lu, %lu)",
- phys_4096,
- version,
- index);
+ phys_4096, version, index);
+
WARN_ON(!IS_ALIGNED(phys_4096, 4096));
+
return plpar_hcall_norets(H_GET_24X7_CATALOG_PAGE,
- phys_4096,
- version,
- index);
+ phys_4096, version, index);
}
static unsigned long h_get_24x7_catalog_page(char page[],
struct dev_ext_attribute *d;
d = container_of(attr, struct dev_ext_attribute, attr);
+
return sprintf(buf, "%s\n", (char *)d->var);
}
attr->attr.attr.name = name;
attr->attr.attr.mode = 0444;
attr->attr.show = device_show_string;
+
return &attr->attr.attr;
}
a_ev_name = kasprintf(GFP_KERNEL, "%.*s%s__%d",
(int)event_name_len, ev_name, ev_suffix, nonce);
-
if (!a_ev_name)
goto out_val;
uint64_t catalog_version_num = 0;
void *page = kmem_cache_alloc(hv_page_cache, GFP_USER);
struct hv_24x7_catalog_page_0 *page_0 = page;
+
if (!page)
return -ENOMEM;
result_buffer->failing_request_ix);
}
-static unsigned long single_24x7_request(struct perf_event *event, u64 *count)
+/*
+ * 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)
{
- u16 idx;
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;
+ /*
+ * 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);
- BUILD_BUG_ON(sizeof(*request_buffer) > 4096);
- BUILD_BUG_ON(sizeof(*result_buffer) > 4096);
+ if (ret)
+ log_24x7_hcall(request_buffer, result_buffer, ret);
- request_buffer = (void *)get_cpu_var(hv_24x7_reqb);
- result_buffer = (void *)get_cpu_var(hv_24x7_resb);
+ return ret;
+}
- memset(request_buffer, 0, 4096);
- memset(result_buffer, 0, 4096);
+/*
+ * 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);
- request_buffer->interface_version = HV_24X7_IF_VERSION_CURRENT;
- request_buffer->num_requests = 1;
-
- req = &request_buffer->requests[0];
+ 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->starting_ix = cpu_to_be16(idx);
req->max_ix = cpu_to_be16(1);
- /*
- * 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);
+ 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;
+
+ BUILD_BUG_ON(sizeof(*request_buffer) > 4096);
+ BUILD_BUG_ON(sizeof(*result_buffer) > 4096);
+
+ request_buffer = (void *)get_cpu_var(hv_24x7_reqb);
+ result_buffer = (void *)get_cpu_var(hv_24x7_resb);
+
+ init_24x7_request(request_buffer, result_buffer);
+
+ ret = add_event_to_24x7_request(event, request_buffer);
+ if (ret)
+ return ret;
+ 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;
}
return ct;
}
-static void h_24x7_event_update(struct perf_event *event)
+static void update_event_count(struct perf_event *event, u64 now)
{
s64 prev;
- u64 now;
- now = h_24x7_get_value(event);
+
prev = local64_xchg(&event->hw.prev_count, now);
local64_add(now - prev, &event->count);
}
+static void h_24x7_event_read(struct perf_event *event)
+{
+ u64 now;
+
+ now = h_24x7_get_value(event);
+ update_event_count(event, now);
+}
+
static void h_24x7_event_start(struct perf_event *event, int flags)
{
if (flags & PERF_EF_RELOAD)
static void h_24x7_event_stop(struct perf_event *event, int flags)
{
- h_24x7_event_update(event);
+ h_24x7_event_read(event);
}
static int h_24x7_event_add(struct perf_event *event, int flags)
.del = h_24x7_event_stop,
.start = h_24x7_event_start,
.stop = h_24x7_event_stop,
- .read = h_24x7_event_update,
+ .read = h_24x7_event_read,
};
static int hv_24x7_init(void)