The CXL port enumeration process adds intermediate CXL ports that are
discovered between "root" CXL ports enumerated by 'cxl_acpi' and
endpoints enumerated by 'cxl_pci + cxl_mem'. Test the dynamic discovery
of intermediate switch ports in a CXL topology.
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
tools/testing/cxl/test/cxl.c | 138 ++++++++++++++++++++++++++++++------------
1 file changed, 97 insertions(+), 41 deletions(-)
diff --git a/tools/testing/cxl/test/cxl.c b/tools/testing/cxl/test/cxl.c
index 7e4a0b1ee436..ea88fabc3198 100644
--- a/tools/testing/cxl/test/cxl.c
+++ b/tools/testing/cxl/test/cxl.c
@@ -11,14 +11,21 @@
#include <cxlmem.h>
#include "mock.h"
-#define NR_CXL_HOST_BRIDGES 4
+#define NR_CXL_HOST_BRIDGES 2
#define NR_CXL_ROOT_PORTS 2
+#define NR_CXL_SWITCH_PORTS 2
static struct platform_device *cxl_acpi;
static struct platform_device *cxl_host_bridge[NR_CXL_HOST_BRIDGES];
static struct platform_device
*cxl_root_port[NR_CXL_HOST_BRIDGES * NR_CXL_ROOT_PORTS];
-struct platform_device *cxl_mem[NR_CXL_HOST_BRIDGES * NR_CXL_ROOT_PORTS];
+static struct platform_device
+ *cxl_switch_uport[NR_CXL_HOST_BRIDGES * NR_CXL_ROOT_PORTS];
+static struct platform_device
+ *cxl_switch_dport[NR_CXL_HOST_BRIDGES * NR_CXL_ROOT_PORTS *
+ NR_CXL_SWITCH_PORTS];
+struct platform_device
+ *cxl_mem[NR_CXL_HOST_BRIDGES * NR_CXL_ROOT_PORTS * NR_CXL_SWITCH_PORTS];
static struct acpi_device acpi0017_mock;
static struct acpi_device host_bridge[NR_CXL_HOST_BRIDGES] = {
@@ -28,12 +35,6 @@ static struct acpi_device host_bridge[NR_CXL_HOST_BRIDGES] = {
[1] = {
.handle = &host_bridge[1],
},
- [2] = {
- .handle = &host_bridge[2],
- },
- [3] = {
- .handle = &host_bridge[3],
- },
};
static bool is_mock_dev(struct device *dev)
@@ -71,7 +72,7 @@ static struct {
} cfmws0;
struct {
struct acpi_cedt_cfmws cfmws;
- u32 target[4];
+ u32 target[2];
} cfmws1;
struct {
struct acpi_cedt_cfmws cfmws;
@@ -79,7 +80,7 @@ static struct {
} cfmws2;
struct {
struct acpi_cedt_cfmws cfmws;
- u32 target[4];
+ u32 target[2];
} cfmws3;
} __packed mock_cedt = {
.cedt = {
@@ -105,22 +106,6 @@ static struct {
.uid = 1,
.cxl_version = ACPI_CEDT_CHBS_VERSION_CXL20,
},
- .chbs[2] = {
- .header = {
- .type = ACPI_CEDT_TYPE_CHBS,
- .length = sizeof(mock_cedt.chbs[0]),
- },
- .uid = 2,
- .cxl_version = ACPI_CEDT_CHBS_VERSION_CXL20,
- },
- .chbs[3] = {
- .header = {
- .type = ACPI_CEDT_TYPE_CHBS,
- .length = sizeof(mock_cedt.chbs[0]),
- },
- .uid = 3,
- .cxl_version = ACPI_CEDT_CHBS_VERSION_CXL20,
- },
.cfmws0 = {
.cfmws = {
.header = {
@@ -142,14 +127,14 @@ static struct {
.type = ACPI_CEDT_TYPE_CFMWS,
.length = sizeof(mock_cedt.cfmws1),
},
- .interleave_ways = 2,
+ .interleave_ways = 1,
.granularity = 4,
.restrictions = ACPI_CEDT_CFMWS_RESTRICT_TYPE3 |
ACPI_CEDT_CFMWS_RESTRICT_VOLATILE,
.qtg_id = 1,
- .window_size = SZ_256M * 4,
+ .window_size = SZ_256M * 2,
},
- .target = { 0, 1, 2, 3 },
+ .target = { 0, 1, },
},
.cfmws2 = {
.cfmws = {
@@ -172,14 +157,14 @@ static struct {
.type = ACPI_CEDT_TYPE_CFMWS,
.length = sizeof(mock_cedt.cfmws3),
},
- .interleave_ways = 2,
+ .interleave_ways = 1,
.granularity = 4,
.restrictions = ACPI_CEDT_CFMWS_RESTRICT_TYPE3 |
ACPI_CEDT_CFMWS_RESTRICT_PMEM,
.qtg_id = 3,
- .window_size = SZ_256M * 4,
+ .window_size = SZ_256M * 2,
},
- .target = { 0, 1, 2, 3 },
+ .target = { 0, 1, },
},
};
@@ -332,6 +317,17 @@ static bool is_mock_port(struct device *dev)
if (dev == &cxl_root_port[i]->dev)
return true;
+ for (i = 0; i < ARRAY_SIZE(cxl_switch_uport); i++)
+ if (dev == &cxl_switch_uport[i]->dev)
+ return true;
+
+ for (i = 0; i < ARRAY_SIZE(cxl_switch_dport); i++)
+ if (dev == &cxl_switch_dport[i]->dev)
+ return true;
+
+ if (is_cxl_memdev(dev))
+ return is_mock_dev(dev->parent);
+
return false;
}
@@ -372,12 +368,6 @@ static struct acpi_pci_root mock_pci_root[NR_CXL_HOST_BRIDGES] = {
[1] = {
.bus = &mock_pci_bus[1],
},
- [2] = {
- .bus = &mock_pci_bus[2],
- },
- [3] = {
- .bus = &mock_pci_bus[3],
- },
};
static bool is_mock_bus(struct pci_bus *bus)
@@ -446,6 +436,26 @@ static int mock_cxl_port_enumerate_dports(struct cxl_port *port)
dev_name(&pdev->dev));
}
+ for (i = 0; i < ARRAY_SIZE(cxl_switch_dport); i++) {
+ struct platform_device *pdev = cxl_switch_dport[i];
+ struct cxl_dport *dport;
+
+ if (pdev->dev.parent != port->uport)
+ continue;
+
+ dport = devm_cxl_add_dport(port, &pdev->dev, pdev->id,
+ CXL_RESOURCE_NONE);
+
+ if (IS_ERR(dport)) {
+ dev_err(dev, "failed to add dport: %s (%ld)\n",
+ dev_name(&pdev->dev), PTR_ERR(dport));
+ return PTR_ERR(dport);
+ }
+
+ dev_dbg(dev, "add dport%d: %s\n", pdev->id,
+ dev_name(&pdev->dev));
+ }
+
return 0;
}
@@ -574,15 +584,51 @@ static __init int cxl_test_init(void)
cxl_root_port[i] = pdev;
}
- BUILD_BUG_ON(ARRAY_SIZE(cxl_mem) != ARRAY_SIZE(cxl_root_port));
+ BUILD_BUG_ON(ARRAY_SIZE(cxl_switch_uport) != ARRAY_SIZE(cxl_root_port));
+ for (i = 0; i < ARRAY_SIZE(cxl_switch_uport); i++) {
+ struct platform_device *root_port = cxl_root_port[i];
+ struct platform_device *pdev;
+
+ pdev = platform_device_alloc("cxl_switch_uport", i);
+ if (!pdev)
+ goto err_port;
+ pdev->dev.parent = &root_port->dev;
+
+ rc = platform_device_add(pdev);
+ if (rc) {
+ platform_device_put(pdev);
+ goto err_uport;
+ }
+ cxl_switch_uport[i] = pdev;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(cxl_switch_dport); i++) {
+ struct platform_device *uport =
+ cxl_switch_uport[i % ARRAY_SIZE(cxl_switch_uport)];
+ struct platform_device *pdev;
+
+ pdev = platform_device_alloc("cxl_switch_dport", i);
+ if (!pdev)
+ goto err_port;
+ pdev->dev.parent = &uport->dev;
+
+ rc = platform_device_add(pdev);
+ if (rc) {
+ platform_device_put(pdev);
+ goto err_dport;
+ }
+ cxl_switch_dport[i] = pdev;
+ }
+
+ BUILD_BUG_ON(ARRAY_SIZE(cxl_mem) != ARRAY_SIZE(cxl_switch_dport));
for (i = 0; i < ARRAY_SIZE(cxl_mem); i++) {
- struct platform_device *port = cxl_root_port[i];
+ struct platform_device *dport = cxl_switch_dport[i];
struct platform_device *pdev;
pdev = alloc_memdev(i);
if (!pdev)
goto err_mem;
- pdev->dev.parent = &port->dev;
+ pdev->dev.parent = &dport->dev;
set_dev_node(&pdev->dev, i % 2);
rc = platform_device_add(pdev);
@@ -611,6 +657,12 @@ static __init int cxl_test_init(void)
err_mem:
for (i = ARRAY_SIZE(cxl_mem) - 1; i >= 0; i--)
platform_device_unregister(cxl_mem[i]);
+err_dport:
+ for (i = ARRAY_SIZE(cxl_switch_dport) - 1; i >= 0; i--)
+ platform_device_unregister(cxl_switch_dport[i]);
+err_uport:
+ for (i = ARRAY_SIZE(cxl_switch_uport) - 1; i >= 0; i--)
+ platform_device_unregister(cxl_switch_uport[i]);
err_port:
for (i = ARRAY_SIZE(cxl_root_port) - 1; i >= 0; i--)
platform_device_unregister(cxl_root_port[i]);
@@ -633,6 +685,10 @@ static __exit void cxl_test_exit(void)
platform_device_unregister(cxl_acpi);
for (i = ARRAY_SIZE(cxl_mem) - 1; i >= 0; i--)
platform_device_unregister(cxl_mem[i]);
+ for (i = ARRAY_SIZE(cxl_switch_dport) - 1; i >= 0; i--)
+ platform_device_unregister(cxl_switch_dport[i]);
+ for (i = ARRAY_SIZE(cxl_switch_uport) - 1; i >= 0; i--)
+ platform_device_unregister(cxl_switch_uport[i]);
for (i = ARRAY_SIZE(cxl_root_port) - 1; i >= 0; i--)
platform_device_unregister(cxl_root_port[i]);
for (i = ARRAY_SIZE(cxl_host_bridge) - 1; i >= 0; i--)
