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Diffstat (limited to 'arch/powerpc/perf/hv-gpci.c')
-rw-r--r--arch/powerpc/perf/hv-gpci.c43
1 files changed, 25 insertions, 18 deletions
diff --git a/arch/powerpc/perf/hv-gpci.c b/arch/powerpc/perf/hv-gpci.c
index 856fe6e03..7aa37236b 100644
--- a/arch/powerpc/perf/hv-gpci.c
+++ b/arch/powerpc/perf/hv-gpci.c
@@ -127,8 +127,16 @@ static const struct attribute_group *attr_groups[] = {
NULL,
};
-#define GPCI_MAX_DATA_BYTES \
- (1024 - sizeof(struct hv_get_perf_counter_info_params))
+#define HGPCI_REQ_BUFFER_SIZE 4096
+#define HGPCI_MAX_DATA_BYTES \
+ (HGPCI_REQ_BUFFER_SIZE - sizeof(struct hv_get_perf_counter_info_params))
+
+DEFINE_PER_CPU(char, hv_gpci_reqb[HGPCI_REQ_BUFFER_SIZE]) __aligned(sizeof(uint64_t));
+
+struct hv_gpci_request_buffer {
+ struct hv_get_perf_counter_info_params params;
+ uint8_t bytes[HGPCI_MAX_DATA_BYTES];
+} __packed;
static unsigned long single_gpci_request(u32 req, u32 starting_index,
u16 secondary_index, u8 version_in, u32 offset, u8 length,
@@ -137,24 +145,21 @@ static unsigned long single_gpci_request(u32 req, u32 starting_index,
unsigned long ret;
size_t i;
u64 count;
+ struct hv_gpci_request_buffer *arg;
+
+ arg = (void *)get_cpu_var(hv_gpci_reqb);
+ memset(arg, 0, HGPCI_REQ_BUFFER_SIZE);
- struct {
- struct hv_get_perf_counter_info_params params;
- uint8_t bytes[GPCI_MAX_DATA_BYTES];
- } __packed __aligned(sizeof(uint64_t)) arg = {
- .params = {
- .counter_request = cpu_to_be32(req),
- .starting_index = cpu_to_be32(starting_index),
- .secondary_index = cpu_to_be16(secondary_index),
- .counter_info_version_in = version_in,
- }
- };
+ arg->params.counter_request = cpu_to_be32(req);
+ arg->params.starting_index = cpu_to_be32(starting_index);
+ arg->params.secondary_index = cpu_to_be16(secondary_index);
+ arg->params.counter_info_version_in = version_in;
ret = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO,
- virt_to_phys(&arg), sizeof(arg));
+ virt_to_phys(arg), HGPCI_REQ_BUFFER_SIZE);
if (ret) {
pr_devel("hcall failed: 0x%lx\n", ret);
- return ret;
+ goto out;
}
/*
@@ -163,9 +168,11 @@ static unsigned long single_gpci_request(u32 req, u32 starting_index,
*/
count = 0;
for (i = offset; i < offset + length; i++)
- count |= arg.bytes[i] << (i - offset);
+ count |= arg->bytes[i] << (i - offset);
*value = count;
+out:
+ put_cpu_var(hv_gpci_reqb);
return ret;
}
@@ -245,10 +252,10 @@ static int h_gpci_event_init(struct perf_event *event)
}
/* last byte within the buffer? */
- if ((event_get_offset(event) + length) > GPCI_MAX_DATA_BYTES) {
+ if ((event_get_offset(event) + length) > HGPCI_MAX_DATA_BYTES) {
pr_devel("request outside of buffer: %zu > %zu\n",
(size_t)event_get_offset(event) + length,
- GPCI_MAX_DATA_BYTES);
+ HGPCI_MAX_DATA_BYTES);
return -EINVAL;
}