Transactional memory is currently only supported on KVM-HV, and
not yet on KVM-PR. So it's better to check the device tree first
and fail gracefully if it's not available.
Signed-off-by: Thomas Huth <thuth@xxxxxxxxxx>
---
powerpc/tm.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/powerpc/tm.c b/powerpc/tm.c
index 6ce750a..83d9d3d 100644
--- a/powerpc/tm.c
+++ b/powerpc/tm.c
@@ -10,6 +10,32 @@
#include <asm/processor.h>
#include <asm/handlers.h>
#include <asm/smp.h>
+#include <asm/setup.h>
+#include <devicetree.h>
+
+/* Check "ibm,pa-features" property of a CPU node for the TM flag */
+static void cpu_has_tm(int fdtnode, u32 regval __unused, void *ptr)
+{
+ const struct fdt_property *prop;
+ int plen;
+
+ prop = fdt_get_property(dt_fdt(), fdtnode, "ibm,pa-features", &plen);
+ assert(prop != NULL);
+
+ if (plen >= 26 && prop->data[1] == 0 && (prop->data[24] & 0x80) != 0)
+ *(int *)ptr += 1;
+}
+
+/* Check whether all CPU nodes have the TM flag */
+static bool all_cpus_have_tm(void)
+{
+ int ret;
+ int available = 0;
+
+ ret = dt_for_each_cpu_node(cpu_has_tm, &available);
+
+ return ret == 0 && available == nr_cpus;
+}
static int h_cede(void)
{
@@ -106,6 +132,11 @@ int main(int argc, char **argv)
report_prefix_push("tm");
+ i = all_cpus_have_tm();
+ report_xfail("TM available in 'ibm,pa-features' property", !i, i);
+ if (!i)
+ return report_summary();
+
all = argc == 1 || !strcmp(argv[1], "all");
for (i = 0; hctests[i].name != NULL; i++) {
--
1.8.3.1
--
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