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cxl/test: Improve init-order fidelity relative to real-world systems
The investigation of an initialization failure [1] highlighted that cxl_test does not reflect the init-order of real world systems. The expected order is root/bus first then async probing of the memory devices. Fix up cxl_test to reflect that order. While it did not reproduce the initial bug report (since that is dependent on built-in vs modular builds), it did reveal a separate latent bug in the subsystem's decoder shutdown flow. Fix for that sent separately. Link: http://lore.kernel.org/20241004212504.1246-1-gourry@gourry.net [1] Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Jonathan Cameron <jonathan.cameron@huawei.com> Cc: Dave Jiang <dave.jiang@intel.com> Cc: Alison Schofield <alison.schofield@intel.com> Cc: Vishal Verma <vishal.l.verma@intel.com> Cc: Ira Weiny <ira.weiny@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Link: https://patch.msgid.link/172964784521.81806.15791069994065969243.stgit@dwillia2-xfh.jf.intel.com Signed-off-by: Ira Weiny <ira.weiny@intel.com>
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-83
lines changed

2 files changed

+104
-83
lines changed

‎tools/testing/cxl/test/cxl.c

Lines changed: 103 additions & 83 deletions
Original file line numberDiff line numberDiff line change
@@ -1058,7 +1058,7 @@ static void mock_companion(struct acpi_device *adev, struct device *dev)
10581058
#define SZ_64G (SZ_32G * 2)
10591059
#endif
10601060

1061-
static __init int cxl_rch_init(void)
1061+
static __init int cxl_rch_topo_init(void)
10621062
{
10631063
int rc, i;
10641064

@@ -1086,30 +1086,8 @@ static __init int cxl_rch_init(void)
10861086
goto err_bridge;
10871087
}
10881088

1089-
for (i = 0; i < ARRAY_SIZE(cxl_rcd); i++) {
1090-
int idx = NR_MEM_MULTI + NR_MEM_SINGLE + i;
1091-
struct platform_device *rch = cxl_rch[i];
1092-
struct platform_device *pdev;
1093-
1094-
pdev = platform_device_alloc("cxl_rcd", idx);
1095-
if (!pdev)
1096-
goto err_mem;
1097-
pdev->dev.parent = &rch->dev;
1098-
set_dev_node(&pdev->dev, i % 2);
1099-
1100-
rc = platform_device_add(pdev);
1101-
if (rc) {
1102-
platform_device_put(pdev);
1103-
goto err_mem;
1104-
}
1105-
cxl_rcd[i] = pdev;
1106-
}
1107-
11081089
return 0;
11091090

1110-
err_mem:
1111-
for (i = ARRAY_SIZE(cxl_rcd) - 1; i >= 0; i--)
1112-
platform_device_unregister(cxl_rcd[i]);
11131091
err_bridge:
11141092
for (i = ARRAY_SIZE(cxl_rch) - 1; i >= 0; i--) {
11151093
struct platform_device *pdev = cxl_rch[i];
@@ -1123,12 +1101,10 @@ static __init int cxl_rch_init(void)
11231101
return rc;
11241102
}
11251103

1126-
static void cxl_rch_exit(void)
1104+
static void cxl_rch_topo_exit(void)
11271105
{
11281106
int i;
11291107

1130-
for (i = ARRAY_SIZE(cxl_rcd) - 1; i >= 0; i--)
1131-
platform_device_unregister(cxl_rcd[i]);
11321108
for (i = ARRAY_SIZE(cxl_rch) - 1; i >= 0; i--) {
11331109
struct platform_device *pdev = cxl_rch[i];
11341110

@@ -1139,7 +1115,7 @@ static void cxl_rch_exit(void)
11391115
}
11401116
}
11411117

1142-
static __init int cxl_single_init(void)
1118+
static __init int cxl_single_topo_init(void)
11431119
{
11441120
int i, rc;
11451121

@@ -1224,29 +1200,8 @@ static __init int cxl_single_init(void)
12241200
cxl_swd_single[i] = pdev;
12251201
}
12261202

1227-
for (i = 0; i < ARRAY_SIZE(cxl_mem_single); i++) {
1228-
struct platform_device *dport = cxl_swd_single[i];
1229-
struct platform_device *pdev;
1230-
1231-
pdev = platform_device_alloc("cxl_mem", NR_MEM_MULTI + i);
1232-
if (!pdev)
1233-
goto err_mem;
1234-
pdev->dev.parent = &dport->dev;
1235-
set_dev_node(&pdev->dev, i % 2);
1236-
1237-
rc = platform_device_add(pdev);
1238-
if (rc) {
1239-
platform_device_put(pdev);
1240-
goto err_mem;
1241-
}
1242-
cxl_mem_single[i] = pdev;
1243-
}
1244-
12451203
return 0;
12461204

1247-
err_mem:
1248-
for (i = ARRAY_SIZE(cxl_mem_single) - 1; i >= 0; i--)
1249-
platform_device_unregister(cxl_mem_single[i]);
12501205
err_dport:
12511206
for (i = ARRAY_SIZE(cxl_swd_single) - 1; i >= 0; i--)
12521207
platform_device_unregister(cxl_swd_single[i]);
@@ -1269,12 +1224,10 @@ static __init int cxl_single_init(void)
12691224
return rc;
12701225
}
12711226

1272-
static void cxl_single_exit(void)
1227+
static void cxl_single_topo_exit(void)
12731228
{
12741229
int i;
12751230

1276-
for (i = ARRAY_SIZE(cxl_mem_single) - 1; i >= 0; i--)
1277-
platform_device_unregister(cxl_mem_single[i]);
12781231
for (i = ARRAY_SIZE(cxl_swd_single) - 1; i >= 0; i--)
12791232
platform_device_unregister(cxl_swd_single[i]);
12801233
for (i = ARRAY_SIZE(cxl_swu_single) - 1; i >= 0; i--)
@@ -1291,6 +1244,91 @@ static void cxl_single_exit(void)
12911244
}
12921245
}
12931246

1247+
static void cxl_mem_exit(void)
1248+
{
1249+
int i;
1250+
1251+
for (i = ARRAY_SIZE(cxl_rcd) - 1; i >= 0; i--)
1252+
platform_device_unregister(cxl_rcd[i]);
1253+
for (i = ARRAY_SIZE(cxl_mem_single) - 1; i >= 0; i--)
1254+
platform_device_unregister(cxl_mem_single[i]);
1255+
for (i = ARRAY_SIZE(cxl_mem) - 1; i >= 0; i--)
1256+
platform_device_unregister(cxl_mem[i]);
1257+
}
1258+
1259+
static int cxl_mem_init(void)
1260+
{
1261+
int i, rc;
1262+
1263+
for (i = 0; i < ARRAY_SIZE(cxl_mem); i++) {
1264+
struct platform_device *dport = cxl_switch_dport[i];
1265+
struct platform_device *pdev;
1266+
1267+
pdev = platform_device_alloc("cxl_mem", i);
1268+
if (!pdev)
1269+
goto err_mem;
1270+
pdev->dev.parent = &dport->dev;
1271+
set_dev_node(&pdev->dev, i % 2);
1272+
1273+
rc = platform_device_add(pdev);
1274+
if (rc) {
1275+
platform_device_put(pdev);
1276+
goto err_mem;
1277+
}
1278+
cxl_mem[i] = pdev;
1279+
}
1280+
1281+
for (i = 0; i < ARRAY_SIZE(cxl_mem_single); i++) {
1282+
struct platform_device *dport = cxl_swd_single[i];
1283+
struct platform_device *pdev;
1284+
1285+
pdev = platform_device_alloc("cxl_mem", NR_MEM_MULTI + i);
1286+
if (!pdev)
1287+
goto err_single;
1288+
pdev->dev.parent = &dport->dev;
1289+
set_dev_node(&pdev->dev, i % 2);
1290+
1291+
rc = platform_device_add(pdev);
1292+
if (rc) {
1293+
platform_device_put(pdev);
1294+
goto err_single;
1295+
}
1296+
cxl_mem_single[i] = pdev;
1297+
}
1298+
1299+
for (i = 0; i < ARRAY_SIZE(cxl_rcd); i++) {
1300+
int idx = NR_MEM_MULTI + NR_MEM_SINGLE + i;
1301+
struct platform_device *rch = cxl_rch[i];
1302+
struct platform_device *pdev;
1303+
1304+
pdev = platform_device_alloc("cxl_rcd", idx);
1305+
if (!pdev)
1306+
goto err_rcd;
1307+
pdev->dev.parent = &rch->dev;
1308+
set_dev_node(&pdev->dev, i % 2);
1309+
1310+
rc = platform_device_add(pdev);
1311+
if (rc) {
1312+
platform_device_put(pdev);
1313+
goto err_rcd;
1314+
}
1315+
cxl_rcd[i] = pdev;
1316+
}
1317+
1318+
return 0;
1319+
1320+
err_rcd:
1321+
for (i = ARRAY_SIZE(cxl_rcd) - 1; i >= 0; i--)
1322+
platform_device_unregister(cxl_rcd[i]);
1323+
err_single:
1324+
for (i = ARRAY_SIZE(cxl_mem_single) - 1; i >= 0; i--)
1325+
platform_device_unregister(cxl_mem_single[i]);
1326+
err_mem:
1327+
for (i = ARRAY_SIZE(cxl_mem) - 1; i >= 0; i--)
1328+
platform_device_unregister(cxl_mem[i]);
1329+
return rc;
1330+
}
1331+
12941332
static __init int cxl_test_init(void)
12951333
{
12961334
int rc, i;
@@ -1403,29 +1441,11 @@ static __init int cxl_test_init(void)
14031441
cxl_switch_dport[i] = pdev;
14041442
}
14051443

1406-
for (i = 0; i < ARRAY_SIZE(cxl_mem); i++) {
1407-
struct platform_device *dport = cxl_switch_dport[i];
1408-
struct platform_device *pdev;
1409-
1410-
pdev = platform_device_alloc("cxl_mem", i);
1411-
if (!pdev)
1412-
goto err_mem;
1413-
pdev->dev.parent = &dport->dev;
1414-
set_dev_node(&pdev->dev, i % 2);
1415-
1416-
rc = platform_device_add(pdev);
1417-
if (rc) {
1418-
platform_device_put(pdev);
1419-
goto err_mem;
1420-
}
1421-
cxl_mem[i] = pdev;
1422-
}
1423-
1424-
rc = cxl_single_init();
1444+
rc = cxl_single_topo_init();
14251445
if (rc)
1426-
goto err_mem;
1446+
goto err_dport;
14271447

1428-
rc = cxl_rch_init();
1448+
rc = cxl_rch_topo_init();
14291449
if (rc)
14301450
goto err_single;
14311451

@@ -1438,19 +1458,20 @@ static __init int cxl_test_init(void)
14381458

14391459
rc = platform_device_add(cxl_acpi);
14401460
if (rc)
1441-
goto err_add;
1461+
goto err_root;
1462+
1463+
rc = cxl_mem_init();
1464+
if (rc)
1465+
goto err_root;
14421466

14431467
return 0;
14441468

1445-
err_add:
1469+
err_root:
14461470
platform_device_put(cxl_acpi);
14471471
err_rch:
1448-
cxl_rch_exit();
1472+
cxl_rch_topo_exit();
14491473
err_single:
1450-
cxl_single_exit();
1451-
err_mem:
1452-
for (i = ARRAY_SIZE(cxl_mem) - 1; i >= 0; i--)
1453-
platform_device_unregister(cxl_mem[i]);
1474+
cxl_single_topo_exit();
14541475
err_dport:
14551476
for (i = ARRAY_SIZE(cxl_switch_dport) - 1; i >= 0; i--)
14561477
platform_device_unregister(cxl_switch_dport[i]);
@@ -1482,11 +1503,10 @@ static __exit void cxl_test_exit(void)
14821503
{
14831504
int i;
14841505

1506+
cxl_mem_exit();
14851507
platform_device_unregister(cxl_acpi);
1486-
cxl_rch_exit();
1487-
cxl_single_exit();
1488-
for (i = ARRAY_SIZE(cxl_mem) - 1; i >= 0; i--)
1489-
platform_device_unregister(cxl_mem[i]);
1508+
cxl_rch_topo_exit();
1509+
cxl_single_topo_exit();
14901510
for (i = ARRAY_SIZE(cxl_switch_dport) - 1; i >= 0; i--)
14911511
platform_device_unregister(cxl_switch_dport[i]);
14921512
for (i = ARRAY_SIZE(cxl_switch_uport) - 1; i >= 0; i--)

‎tools/testing/cxl/test/mem.c

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1673,6 +1673,7 @@ static struct platform_driver cxl_mock_mem_driver = {
16731673
.name = KBUILD_MODNAME,
16741674
.dev_groups = cxl_mock_mem_groups,
16751675
.groups = cxl_mock_mem_core_groups,
1676+
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
16761677
},
16771678
};
16781679

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