aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--drivers/cxl/core/pci.c27
-rw-r--r--drivers/cxl/cxl.h1
-rw-r--r--drivers/cxl/port.c14
-rw-r--r--tools/testing/cxl/Kbuild1
-rw-r--r--tools/testing/cxl/test/mock.c15
5 files changed, 49 insertions, 9 deletions
diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c
index f332fe7af92b..c35c002b65dd 100644
--- a/drivers/cxl/core/pci.c
+++ b/drivers/cxl/core/pci.c
@@ -241,17 +241,36 @@ static void disable_hdm(void *_cxlhdm)
hdm + CXL_HDM_DECODER_CTRL_OFFSET);
}
-static int devm_cxl_enable_hdm(struct device *host, struct cxl_hdm *cxlhdm)
+int devm_cxl_enable_hdm(struct cxl_port *port, struct cxl_hdm *cxlhdm)
{
- void __iomem *hdm = cxlhdm->regs.hdm_decoder;
+ void __iomem *hdm;
u32 global_ctrl;
+ /*
+ * If the hdm capability was not mapped there is nothing to enable and
+ * the caller is responsible for what happens next. For example,
+ * emulate a passthrough decoder.
+ */
+ if (IS_ERR(cxlhdm))
+ return 0;
+
+ hdm = cxlhdm->regs.hdm_decoder;
global_ctrl = readl(hdm + CXL_HDM_DECODER_CTRL_OFFSET);
+
+ /*
+ * If the HDM decoder capability was enabled on entry, skip
+ * registering disable_hdm() since this decode capability may be
+ * owned by platform firmware.
+ */
+ if (global_ctrl & CXL_HDM_DECODER_ENABLE)
+ return 0;
+
writel(global_ctrl | CXL_HDM_DECODER_ENABLE,
hdm + CXL_HDM_DECODER_CTRL_OFFSET);
- return devm_add_action_or_reset(host, disable_hdm, cxlhdm);
+ return devm_add_action_or_reset(&port->dev, disable_hdm, cxlhdm);
}
+EXPORT_SYMBOL_NS_GPL(devm_cxl_enable_hdm, CXL);
int cxl_dvsec_rr_decode(struct device *dev, int d,
struct cxl_endpoint_dvsec_info *info)
@@ -425,7 +444,7 @@ int cxl_hdm_decode_init(struct cxl_dev_state *cxlds, struct cxl_hdm *cxlhdm,
if (info->mem_enabled)
return 0;
- rc = devm_cxl_enable_hdm(&port->dev, cxlhdm);
+ rc = devm_cxl_enable_hdm(port, cxlhdm);
if (rc)
return rc;
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index 044a92d9813e..f93a28538962 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -710,6 +710,7 @@ struct cxl_endpoint_dvsec_info {
struct cxl_hdm;
struct cxl_hdm *devm_cxl_setup_hdm(struct cxl_port *port,
struct cxl_endpoint_dvsec_info *info);
+int devm_cxl_enable_hdm(struct cxl_port *port, struct cxl_hdm *cxlhdm);
int devm_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm,
struct cxl_endpoint_dvsec_info *info);
int devm_cxl_add_passthrough_decoder(struct cxl_port *port);
diff --git a/drivers/cxl/port.c b/drivers/cxl/port.c
index eb57324c4ad4..17a95f469c26 100644
--- a/drivers/cxl/port.c
+++ b/drivers/cxl/port.c
@@ -60,13 +60,17 @@ static int discover_region(struct device *dev, void *root)
static int cxl_switch_port_probe(struct cxl_port *port)
{
struct cxl_hdm *cxlhdm;
- int rc;
+ int rc, nr_dports;
- rc = devm_cxl_port_enumerate_dports(port);
- if (rc < 0)
- return rc;
+ nr_dports = devm_cxl_port_enumerate_dports(port);
+ if (nr_dports < 0)
+ return nr_dports;
cxlhdm = devm_cxl_setup_hdm(port, NULL);
+ rc = devm_cxl_enable_hdm(port, cxlhdm);
+ if (rc)
+ return rc;
+
if (!IS_ERR(cxlhdm))
return devm_cxl_enumerate_decoders(cxlhdm, NULL);
@@ -75,7 +79,7 @@ static int cxl_switch_port_probe(struct cxl_port *port)
return PTR_ERR(cxlhdm);
}
- if (rc == 1) {
+ if (nr_dports == 1) {
dev_dbg(&port->dev, "Fallback to passthrough decoder\n");
return devm_cxl_add_passthrough_decoder(port);
}
diff --git a/tools/testing/cxl/Kbuild b/tools/testing/cxl/Kbuild
index fba7bec96acd..6f9347ade82c 100644
--- a/tools/testing/cxl/Kbuild
+++ b/tools/testing/cxl/Kbuild
@@ -6,6 +6,7 @@ ldflags-y += --wrap=acpi_pci_find_root
ldflags-y += --wrap=nvdimm_bus_register
ldflags-y += --wrap=devm_cxl_port_enumerate_dports
ldflags-y += --wrap=devm_cxl_setup_hdm
+ldflags-y += --wrap=devm_cxl_enable_hdm
ldflags-y += --wrap=devm_cxl_add_passthrough_decoder
ldflags-y += --wrap=devm_cxl_enumerate_decoders
ldflags-y += --wrap=cxl_await_media_ready
diff --git a/tools/testing/cxl/test/mock.c b/tools/testing/cxl/test/mock.c
index de3933a776fd..284416527644 100644
--- a/tools/testing/cxl/test/mock.c
+++ b/tools/testing/cxl/test/mock.c
@@ -149,6 +149,21 @@ struct cxl_hdm *__wrap_devm_cxl_setup_hdm(struct cxl_port *port,
}
EXPORT_SYMBOL_NS_GPL(__wrap_devm_cxl_setup_hdm, CXL);
+int __wrap_devm_cxl_enable_hdm(struct cxl_port *port, struct cxl_hdm *cxlhdm)
+{
+ int index, rc;
+ struct cxl_mock_ops *ops = get_cxl_mock_ops(&index);
+
+ if (ops && ops->is_mock_port(port->uport))
+ rc = 0;
+ else
+ rc = devm_cxl_enable_hdm(port, cxlhdm);
+ put_cxl_mock_ops(index);
+
+ return rc;
+}
+EXPORT_SYMBOL_NS_GPL(__wrap_devm_cxl_enable_hdm, CXL);
+
int __wrap_devm_cxl_add_passthrough_decoder(struct cxl_port *port)
{
int rc, index;