Since region programming sees all components in the topology as a port, it's required that endpoints are treated equally. The easiest way to go from endpoint to port is to simply cache it at creation time.
Signed-off-by: Ben Widawsky <[email protected]> --- Changes since v2: - Rebased on Dan's latest port/mem changes - Keep a reference to the port until the memdev goes away - add action to release device reference for the port --- drivers/cxl/cxlmem.h | 2 ++ drivers/cxl/mem.c | 35 ++++++++++++++++++++++++++++------- 2 files changed, 30 insertions(+), 7 deletions(-) diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h index 7ba0edb4a1ab..2b8c66616d4e 100644 --- a/drivers/cxl/cxlmem.h +++ b/drivers/cxl/cxlmem.h @@ -37,6 +37,7 @@ * @id: id number of this memdev instance. * @detach_work: active memdev lost a port in its ancestry * @component_reg_phys: register base of component registers + * @port: The port created by this device */ struct cxl_memdev { struct device dev; @@ -44,6 +45,7 @@ struct cxl_memdev { struct cxl_dev_state *cxlds; struct work_struct detach_work; int id; + struct cxl_port *port; }; static inline struct cxl_memdev *to_cxl_memdev(struct device *dev) diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c index 27f9dd0d55b6..c36219193886 100644 --- a/drivers/cxl/mem.c +++ b/drivers/cxl/mem.c @@ -45,26 +45,31 @@ static int wait_for_media(struct cxl_memdev *cxlmd) return 0; } -static int create_endpoint(struct cxl_memdev *cxlmd, - struct cxl_port *parent_port) +static struct cxl_port *create_endpoint(struct cxl_memdev *cxlmd, + struct cxl_port *parent_port) { struct cxl_dev_state *cxlds = cxlmd->cxlds; struct cxl_port *endpoint; + int rc; endpoint = devm_cxl_add_port(&parent_port->dev, &cxlmd->dev, cxlds->component_reg_phys, parent_port); if (IS_ERR(endpoint)) - return PTR_ERR(endpoint); + return endpoint; dev_dbg(&cxlmd->dev, "add: %s\n", dev_name(&endpoint->dev)); if (!endpoint->dev.driver) { dev_err(&cxlmd->dev, "%s failed probe\n", dev_name(&endpoint->dev)); - return -ENXIO; + return ERR_PTR(-ENXIO); } - return cxl_endpoint_autoremove(cxlmd, endpoint); + rc = cxl_endpoint_autoremove(cxlmd, endpoint); + if (rc) + return ERR_PTR(rc); + + return endpoint; } /** @@ -127,11 +132,18 @@ __mock bool cxl_dvsec_decode_init(struct cxl_dev_state *cxlds) return do_hdm_init; } +static void delete_memdev(void *dev) +{ + struct cxl_memdev *cxlmd = dev; + + put_device(&cxlmd->port->dev); +} + static int cxl_mem_probe(struct device *dev) { struct cxl_memdev *cxlmd = to_cxl_memdev(dev); struct cxl_dev_state *cxlds = cxlmd->cxlds; - struct cxl_port *parent_port; + struct cxl_port *parent_port, *ep_port; int rc; /* @@ -201,7 +213,16 @@ static int cxl_mem_probe(struct device *dev) goto out; } - rc = create_endpoint(cxlmd, parent_port); + ep_port = create_endpoint(cxlmd, parent_port); + if (IS_ERR(ep_port)) { + rc = PTR_ERR(ep_port); + goto out; + } + + get_device(&ep_port->dev); + cxlmd->port = ep_port; + + rc = devm_add_action_or_reset(dev, delete_memdev, cxlmd); out: cxl_device_unlock(&parent_port->dev); put_device(&parent_port->dev); -- 2.35.0
