[PATCH v4 42/42] qtest/cxl: Add very basic sanity tests

[Jonathan Cameron via <qemu-devel@nongnu.org>]

From: Ben Widawsky <ben.widawsky@intel.com>

Simple 'does it boot tests' with up to
2x PXB host bridge, each with 2x CXL RP and each of those with
a Type 3 memory device.  Single CFMWS to interleave across the
two HBs and ultimate the 4 devices.

More complete tests may be possible but CXL interleave setup
is complex so a lot of steps will be needed.

Signed-off-by: Ben Widawsky <ben.widawsky@intel.com>
Co-developed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 tests/qtest/cxl-test.c  | 151 ++++++++++++++++++++++++++++++++++++++++
 tests/qtest/meson.build |   4 ++
 2 files changed, 155 insertions(+)

diff --git a/tests/qtest/cxl-test.c b/tests/qtest/cxl-test.c
new file mode 100644
index 0000000000..bbefbaa870
--- /dev/null
+++ b/tests/qtest/cxl-test.c
@@ -0,0 +1,151 @@
+/*
+ * QTest testcase for CXL
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "libqtest-single.h"
+
+#define QEMU_PXB_CMD "-machine q35,cxl=on " \
+                     "-device pxb-cxl,id=cxl.0,bus=pcie.0,bus_nr=52,uid=22 "  \
+                     "-cxl-fixed-memory-window targets=cxl.0,size=4G "
+
+#define QEMU_2PXB_CMD "-machine q35,cxl=on " \
+                      "-device pxb-cxl,id=cxl.0,bus=pcie.0,bus_nr=52,uid=22 "  \
+                      "-device pxb-cxl,id=cxl.1,bus=pcie.0,bus_nr=53,uid=122 " \
+                      "-cxl-fixed-memory-window targets=cxl.0,targets=cxl.1,size=4G "
+
+#define QEMU_RP "-device cxl-rp,id=rp0,bus=cxl.0,chassis=0,slot=0 "
+
+/* Dual ports on first pxb */
+#define QEMU_2RP "-device cxl-rp,id=rp0,bus=cxl.0,chassis=0,slot=0 " \
+                 "-device cxl-rp,id=rp1,bus=cxl.0,chassis=0,slot=1 "
+
+/* Dual ports on each of the pxb instances */
+#define QEMU_4RP "-device cxl-rp,id=rp0,bus=cxl.0,chassis=0,slot=0 " \
+                 "-device cxl-rp,id=rp1,bus=cxl.0,chassis=0,slot=1 " \
+                 "-device cxl-rp,id=rp2,bus=cxl.1,chassis=0,slot=2 " \
+                 "-device cxl-rp,id=rp3,bus=cxl.1,chassis=0,slot=3 "
+
+#define QEMU_T3D "-object memory-backend-file,id=cxl-mem0,mem-path=%s,size=256M " \
+                 "-device cxl-type3,bus=rp0,memdev=cxl-mem0,id=cxl-pmem0,size=256M "
+
+#define QEMU_2T3D "-object memory-backend-file,id=cxl-mem0,mem-path=%s,size=256M "    \
+                  "-device cxl-type3,bus=rp0,memdev=cxl-mem0,id=cxl-pmem0,size=256M " \
+                  "-object memory-backend-file,id=cxl-mem1,mem-path=%s,size=256M "    \
+                  "-device cxl-type3,bus=rp1,memdev=cxl-mem1,id=cxl-pmem1,size=256M "
+
+#define QEMU_4T3D "-object memory-backend-file,id=cxl-mem0,mem-path=%s,size=256M "    \
+                  "-device cxl-type3,bus=rp0,memdev=cxl-mem0,id=cxl-pmem0,size=256M " \
+                  "-object memory-backend-file,id=cxl-mem1,mem-path=%s,size=256M "    \
+                  "-device cxl-type3,bus=rp1,memdev=cxl-mem1,id=cxl-pmem1,size=256M " \
+                  "-object memory-backend-file,id=cxl-mem2,mem-path=%s,size=256M "    \
+                  "-device cxl-type3,bus=rp2,memdev=cxl-mem2,id=cxl-pmem2,size=256M " \
+                  "-object memory-backend-file,id=cxl-mem3,mem-path=%s,size=256M "    \
+                  "-device cxl-type3,bus=rp3,memdev=cxl-mem3,id=cxl-pmem3,size=256M "
+
+static void cxl_basic_hb(void)
+{
+    qtest_start("-machine q35,cxl=on");
+    qtest_end();
+}
+
+static void cxl_basic_pxb(void)
+{
+    qtest_start("-machine q35,cxl=on -device pxb-cxl,bus=pcie.0,uid=22");
+    qtest_end();
+}
+
+static void cxl_pxb_with_window(void)
+{
+    qtest_start(QEMU_PXB_CMD);
+    qtest_end();
+}
+
+static void cxl_2pxb_with_window(void)
+{
+    qtest_start(QEMU_2PXB_CMD);
+    qtest_end();
+}
+
+static void cxl_root_port(void)
+{
+    qtest_start(QEMU_PXB_CMD QEMU_RP);
+    qtest_end();
+}
+
+static void cxl_2root_port(void)
+{
+    qtest_start(QEMU_PXB_CMD QEMU_2RP);
+    qtest_end();
+}
+
+static void cxl_t3d(void)
+{
+    GString *cmdline;
+    char template[] = "/tmp/cxl-test-XXXXXX";
+    const char *tmpfs;
+
+    tmpfs = mkdtemp(template);
+
+    cmdline = g_string_new(NULL);
+    g_string_printf(cmdline, QEMU_PXB_CMD QEMU_RP QEMU_T3D, tmpfs);
+
+    qtest_start(cmdline->str);
+    qtest_end();
+
+    g_string_free(cmdline, TRUE);
+}
+
+static void cxl_1pxb_2rp_2t3d(void)
+{
+    GString *cmdline;
+    char template[] = "/tmp/cxl-test-XXXXXX";
+    const char *tmpfs;
+
+    tmpfs = mkdtemp(template);
+
+    cmdline = g_string_new(NULL);
+    g_string_printf(cmdline, QEMU_PXB_CMD QEMU_2RP QEMU_2T3D, tmpfs, tmpfs);
+
+    qtest_start(cmdline->str);
+    qtest_end();
+
+    g_string_free(cmdline, TRUE);
+}
+
+static void cxl_2pxb_4rp_4t3d(void)
+{
+    GString *cmdline;
+    char template[] = "/tmp/cxl-test-XXXXXX";
+    const char *tmpfs;
+
+    tmpfs = mkdtemp(template);
+
+    cmdline = g_string_new(NULL);
+    g_string_printf(cmdline, QEMU_2PXB_CMD QEMU_4RP QEMU_4T3D,
+                    tmpfs, tmpfs, tmpfs, tmpfs);
+
+    qtest_start(cmdline->str);
+    qtest_end();
+
+    g_string_free(cmdline, TRUE);
+}
+
+int main(int argc, char **argv)
+{
+    g_test_init(&argc, &argv, NULL);
+
+    qtest_add_func("/pci/cxl/basic_hostbridge", cxl_basic_hb);
+    qtest_add_func("/pci/cxl/basic_pxb", cxl_basic_pxb);
+    qtest_add_func("/pci/cxl/pxb_with_window", cxl_pxb_with_window);
+    qtest_add_func("/pci/cxl/pxb_x2_with_window", cxl_2pxb_with_window);
+    qtest_add_func("/pci/cxl/rp", cxl_root_port);
+    qtest_add_func("/pci/cxl/rp_x2", cxl_2root_port);
+    qtest_add_func("/pci/cxl/type3_device", cxl_t3d);
+    qtest_add_func("/pci/cxl/rp_x2_type3_x2", cxl_1pxb_2rp_2t3d);
+    qtest_add_func("/pci/cxl/pxb_x2_root_port_x4_type3_x4", cxl_2pxb_4rp_4t3d);
+    return g_test_run();
+}
diff --git a/tests/qtest/meson.build b/tests/qtest/meson.build
index 26937deb6d..a016449657 100644
--- a/tests/qtest/meson.build
+++ b/tests/qtest/meson.build
@@ -41,6 +41,9 @@ qtests_pci = \
   (config_all_devices.has_key('CONFIG_VGA') ? ['display-vga-test'] : []) +                  \
   (config_all_devices.has_key('CONFIG_IVSHMEM_DEVICE') ? ['ivshmem-test'] : [])
 
+qtests_cxl = \
+  (config_all_devices.has_key('CONFIG_CXL') ? ['cxl-test'] : [])
+
 qtests_i386 = \
   (slirp.found() ? ['pxe-test', 'test-netfilter'] : []) +             \
   (config_host.has_key('CONFIG_POSIX') ? ['test-filter-mirror'] : []) +                     \
@@ -74,6 +77,7 @@ qtests_i386 = \
    slirp.found() ? ['virtio-net-failover'] : []) +                                          \
   (unpack_edk2_blobs ? ['bios-tables-test'] : []) +                                         \
   qtests_pci +                                                                              \
+  qtests_cxl +                                                                              \
   ['fdc-test',
    'ide-test',
    'hd-geo-test',
-- 
2.32.0