[PATCH 01/10] qtest/phb4: Add testbench for PHB4

[Saif Abrar <saif.abrar@linux.vnet.ibm.com>]

New qtest TB added for PHB4.
TB reads PHB Version register and asserts that
bits[24:31] have value 0xA5.

Signed-off-by: Saif Abrar <saif.abrar@linux.vnet.ibm.com>
---
 tests/qtest/meson.build     |  1 +
 tests/qtest/pnv-phb4-test.c | 74 +++++++++++++++++++++++++++++++++++++
 2 files changed, 75 insertions(+)
 create mode 100644 tests/qtest/pnv-phb4-test.c

diff --git a/tests/qtest/meson.build b/tests/qtest/meson.build
index 36c5c13a7b..4795e51c17 100644
--- a/tests/qtest/meson.build
+++ b/tests/qtest/meson.build
@@ -168,6 +168,7 @@ qtests_ppc64 = \
   (config_all_devices.has_key('CONFIG_PSERIES') ? ['device-plug-test'] : []) +               \
   (config_all_devices.has_key('CONFIG_POWERNV') ? ['pnv-xscom-test'] : []) +                 \
   (config_all_devices.has_key('CONFIG_POWERNV') ? ['pnv-host-i2c-test'] : []) +              \
+  (config_all_devices.has_key('CONFIG_POWERNV') ? ['pnv-phb4-test'] : []) +                  \
   (config_all_devices.has_key('CONFIG_PSERIES') ? ['rtas-test'] : []) +                      \
   (slirp.found() ? ['pxe-test'] : []) +              \
   (config_all_devices.has_key('CONFIG_USB_UHCI') ? ['usb-hcd-uhci-test'] : []) +             \
diff --git a/tests/qtest/pnv-phb4-test.c b/tests/qtest/pnv-phb4-test.c
new file mode 100644
index 0000000000..e3b809e9c4
--- /dev/null
+++ b/tests/qtest/pnv-phb4-test.c
@@ -0,0 +1,74 @@
+/*
+ * QTest testcase for PowerNV PHB4
+ *
+ * Copyright (c) 2024, IBM Corporation.
+ *
+ * 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.h"
+#include "hw/pci-host/pnv_phb4_regs.h"
+
+#define P10_XSCOM_BASE          0x000603fc00000000ull
+#define PHB4_MMIO               0x000600c3c0000000ull
+#define PHB4_XSCOM              0x8010900ull
+
+#define PPC_BIT(bit)            (0x8000000000000000ULL >> (bit))
+#define PPC_BITMASK(bs, be)     ((PPC_BIT(bs) - PPC_BIT(be)) | PPC_BIT(bs))
+
+static uint64_t pnv_xscom_addr(uint32_t pcba)
+{
+    return P10_XSCOM_BASE | ((uint64_t) pcba << 3);
+}
+
+static uint64_t pnv_phb4_xscom_addr(uint32_t reg)
+{
+    return pnv_xscom_addr(PHB4_XSCOM + reg);
+}
+
+/*
+ * XSCOM read/write is indirect in PHB4:
+ * Write 'SCOM - HV Indirect Address Register'
+ * with register-offset to read/write.
+   - bit[0]: Valid Bit
+   - bit[51:61]: Indirect Address(00:10)
+ * Read/write 'SCOM - HV Indirect Data Register' to get/set the value.
+ */
+
+static uint64_t pnv_phb4_xscom_read(QTestState *qts, uint32_t reg)
+{
+    qtest_writeq(qts, pnv_phb4_xscom_addr(PHB_SCOM_HV_IND_ADDR),
+            PPC_BIT(0) | reg);
+    return qtest_readq(qts, pnv_phb4_xscom_addr(PHB_SCOM_HV_IND_DATA));
+}
+
+/* Assert that 'PHB - Version Register Offset 0x0800' bits-[24:31] are 0xA5 */
+static void phb4_version_test(QTestState *qts)
+{
+    uint64_t ver = pnv_phb4_xscom_read(qts, PHB_VERSION);
+
+    /* PHB Version register [24:31]: Major Revision ID 0xA5 */
+    ver = ver >> (63 - 31);
+    g_assert_cmpuint(ver, ==, 0xA5);
+}
+
+static void test_phb4(void)
+{
+    QTestState *qts = NULL;
+
+    qts = qtest_initf("-machine powernv10 -accel tcg -nographic -d unimp");
+
+    /* Make sure test is running on PHB */
+    phb4_version_test(qts);
+
+    qtest_quit(qts);
+}
+
+int main(int argc, char **argv)
+{
+    g_test_init(&argc, &argv, NULL);
+    qtest_add_func("phb4", test_phb4);
+    return g_test_run();
+}
-- 
2.39.3