powerpc/perf/hv-24x7: Fix return value of hcalls

The H_GET_24X7_CATALOG_PAGE hcall can return a signed error code, so fix
this in the code.

The H_GET_24X7_DATA hcall can return a signed error code, so fix this in
the code. Also, don't truncate it to 32 bit to use as return value for
make_24x7_request. In case of error h_24x7_event_commit_txn passes that
return value to generic code, so it should be a proper errno. The other
caller of make_24x7_request is single_24x7_request, whose callers don't
actually care which error code is returned so they are not affected by this
change.

Finally, h_24x7_get_value doesn't use the error code from
single_24x7_request, so there's no need to store it.

Reviewed-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/perf/hv-24x7.c b/arch/powerpc/perf/hv-24x7.c
index 111c61ea7416be05d3d63b155c5a0cc1c6c7688a..7e47dcdea62a309616357378928e5f8dbdc3f40f 100644 (file)
--- a/arch/powerpc/perf/hv-24x7.c
+++ b/arch/powerpc/perf/hv-24x7.c
@@ -264,9 +264,8 @@ static void *event_end(struct hv_24x7_event_data *ev, void *end)
        return start + nl + dl + ldl;
 }
 
-static unsigned long h_get_24x7_catalog_page_(unsigned long phys_4096,
-                                             unsigned long version,
-                                             unsigned long index)
+static long h_get_24x7_catalog_page_(unsigned long phys_4096,
+                                    unsigned long version, unsigned long index)
 {
        pr_devel("h_get_24x7_catalog_page(0x%lx, %lu, %lu)",
                        phys_4096, version, index);
@@ -277,8 +276,7 @@ static unsigned long h_get_24x7_catalog_page_(unsigned long phys_4096,
                        phys_4096, version, index);
 }
 
-static unsigned long h_get_24x7_catalog_page(char page[],
-                                            u64 version, u32 index)
+static long h_get_24x7_catalog_page(char page[], u64 version, u32 index)
 {
        return h_get_24x7_catalog_page_(virt_to_phys(page),
                                        version, index);
@@ -668,7 +666,7 @@ static int create_events_from_catalog(struct attribute ***events_,
                                      struct attribute ***event_descs_,
                                      struct attribute ***event_long_descs_)
 {
-       unsigned long hret;
+       long hret;
        size_t catalog_len, catalog_page_len, event_entry_count,
               event_data_len, event_data_offs,
               event_data_bytes, junk_events, event_idx, event_attr_ct, i,
@@ -907,7 +905,7 @@ static ssize_t catalog_read(struct file *filp, struct kobject *kobj,
                            struct bin_attribute *bin_attr, char *buf,
                            loff_t offset, size_t count)
 {
-       unsigned long hret;
+       long hret;
        ssize_t ret = 0;
        size_t catalog_len = 0, catalog_page_len = 0;
        loff_t page_offset = 0;
@@ -992,7 +990,7 @@ static ssize_t _name##_show(struct device *dev,                     \
                            struct device_attribute *dev_attr,  \
                            char *buf)                          \
 {                                                              \
-       unsigned long hret;                                     \
+       long hret;                                              \
        ssize_t ret = 0;                                        \
        void *page = kmem_cache_alloc(hv_page_cache, GFP_USER); \
        struct hv_24x7_catalog_page_0 *page_0 = page;           \
@@ -1065,7 +1063,7 @@ static void init_24x7_request(struct hv_24x7_request_buffer *request_buffer,
 static int make_24x7_request(struct hv_24x7_request_buffer *request_buffer,
                             struct hv_24x7_data_result_buffer *result_buffer)
 {
-       unsigned long ret;
+       long ret;
 
        /*
         * NOTE: Due to variable number of array elements in request and
@@ -1085,9 +1083,10 @@ static int make_24x7_request(struct hv_24x7_request_buffer *request_buffer,
                                      req->starting_ix, req->starting_lpar_ix,
                                      ret, ret, result_buffer->detailed_rc,
                                      result_buffer->failing_request_ix);
+               return -EIO;
        }
 
-       return ret;
+       return 0;
 }
 
 /*
@@ -1135,10 +1134,10 @@ static int add_event_to_24x7_request(struct perf_event *event,
        return 0;
 }
 
-static unsigned long single_24x7_request(struct perf_event *event, u64 *count)
+static int single_24x7_request(struct perf_event *event, u64 *count)
 {
+       int ret;
        u16 num_elements;
-       unsigned long ret;
        struct hv_24x7_result *result;
        struct hv_24x7_request_buffer *request_buffer;
        struct hv_24x7_data_result_buffer *result_buffer;
@@ -1253,10 +1252,9 @@ static int h_24x7_event_init(struct perf_event *event)
 
 static u64 h_24x7_get_value(struct perf_event *event)
 {
-       unsigned long ret;
        u64 ct;
-       ret = single_24x7_request(event, &ct);
-       if (ret)
+
+       if (single_24x7_request(event, &ct))
                /* We checked this in event init, shouldn't fail here... */
                return 0;