libhsakmt: add XNACK API set/get mode

XNACK API for GPUs that support this mode. This API
makes calls to amdgpu driver to configure xnack mode.
It supports set xnack mode and query the current mode used.

Change-Id: If865fd0e3f900f008243dc49504e1a0694e1791a
Signed-off-by: Alex Sierra <alex.sierra@amd.com>

src/libhsakmt.ver

@@ -74,7 +74,8 @@ hsaKmtSetAddressWatch;
 hsaKmtClearAddressWatch;
 hsaKmtSVMSetAttr;
 hsaKmtSVMGetAttr;
-
+hsaKmtSetXNACKMode;
+hsaKmtGetXNACKMode;
 local: *;
 };
 

src/svm.c

@@ -183,3 +183,42 @@ hsaKmtSVMGetAttr(void *start_addr, HSAuint64 size, unsigned int nattr,
 
 	return HSAKMT_STATUS_SUCCESS;
 }
+
+static HSAKMT_STATUS
+hsaKmtSetGetXNACKMode(HSAint32 * enable)
+{
+	struct kfd_ioctl_set_xnack_mode_args args;
+
+	CHECK_KFD_OPEN();
+
+	args.xnack_enabled = *enable;
+
+	if (kmtIoctl(kfd_fd, AMDKFD_IOC_SET_XNACK_MODE, &args)) {
+		if (errno == EPERM) {
+			pr_debug("set mode not supported %s\n",
+				 strerror(errno));
+			return HSAKMT_STATUS_NOT_SUPPORTED;
+		} else if (errno == EBUSY) {
+			pr_debug("kmtIoctl queues not empty %s\n",
+				 strerror(errno));
+		}
+		return HSAKMT_STATUS_ERROR;
+	}
+
+	*enable = args.xnack_enabled;
+
+	return HSAKMT_STATUS_SUCCESS;
+}
+
+HSAKMT_STATUS HSAKMTAPI
+hsaKmtSetXNACKMode(HSAint32 enable)
+{
+	return hsaKmtSetGetXNACKMode(&enable);
+}
+
+HSAKMT_STATUS HSAKMTAPI
+hsaKmtGetXNACKMode(HSAint32 * enable)
+{
+	*enable = -1;
+	return hsaKmtSetGetXNACKMode(enable);
+}