diff options
Diffstat (limited to 'drivers/hwtracing/coresight/coresight-platform.c')
-rw-r--r-- | drivers/hwtracing/coresight/coresight-platform.c | 269 |
1 files changed, 106 insertions, 163 deletions
diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c index 475899714104..3e2e135cb8f6 100644 --- a/drivers/hwtracing/coresight/coresight-platform.c +++ b/drivers/hwtracing/coresight/coresight-platform.c @@ -19,22 +19,85 @@ #include <asm/smp_plat.h> #include "coresight-priv.h" + /* - * coresight_alloc_conns: Allocate connections record for each output - * port from the device. + * Add an entry to the connection list and assign @conn's contents to it. + * + * If the output port is already assigned on this device, return -EINVAL */ -static int coresight_alloc_conns(struct device *dev, - struct coresight_platform_data *pdata) +struct coresight_connection * +coresight_add_out_conn(struct device *dev, + struct coresight_platform_data *pdata, + const struct coresight_connection *new_conn) { - if (pdata->nr_outport) { - pdata->conns = devm_kcalloc(dev, pdata->nr_outport, - sizeof(*pdata->conns), GFP_KERNEL); - if (!pdata->conns) - return -ENOMEM; + int i; + struct coresight_connection *conn; + + /* + * Warn on any existing duplicate output port. + */ + for (i = 0; i < pdata->nr_outconns; ++i) { + conn = pdata->out_conns[i]; + /* Output == -1 means ignore the port for example for helpers */ + if (conn->src_port != -1 && + conn->src_port == new_conn->src_port) { + dev_warn(dev, "Duplicate output port %d\n", + conn->src_port); + return ERR_PTR(-EINVAL); + } } + pdata->nr_outconns++; + pdata->out_conns = + devm_krealloc_array(dev, pdata->out_conns, pdata->nr_outconns, + sizeof(*pdata->out_conns), GFP_KERNEL); + if (!pdata->out_conns) + return ERR_PTR(-ENOMEM); + + conn = devm_kmalloc(dev, sizeof(struct coresight_connection), + GFP_KERNEL); + if (!conn) + return ERR_PTR(-ENOMEM); + + /* + * Copy the new connection into the allocation, save the pointer to the + * end of the connection array and also return it in case it needs to be + * used right away. + */ + *conn = *new_conn; + pdata->out_conns[pdata->nr_outconns - 1] = conn; + return conn; +} +EXPORT_SYMBOL_GPL(coresight_add_out_conn); + +/* + * Add an input connection reference to @out_conn in the target's in_conns array + * + * @out_conn: Existing output connection to store as an input on the + * connection's remote device. + */ +int coresight_add_in_conn(struct coresight_connection *out_conn) +{ + int i; + struct device *dev = out_conn->dest_dev->dev.parent; + struct coresight_platform_data *pdata = out_conn->dest_dev->pdata; + + for (i = 0; i < pdata->nr_inconns; ++i) + if (!pdata->in_conns[i]) { + pdata->in_conns[i] = out_conn; + return 0; + } + + pdata->nr_inconns++; + pdata->in_conns = + devm_krealloc_array(dev, pdata->in_conns, pdata->nr_inconns, + sizeof(*pdata->in_conns), GFP_KERNEL); + if (!pdata->in_conns) + return -ENOMEM; + pdata->in_conns[pdata->nr_inconns - 1] = out_conn; return 0; } +EXPORT_SYMBOL_GPL(coresight_add_in_conn); static struct device * coresight_find_device_by_fwnode(struct fwnode_handle *fwnode) @@ -83,41 +146,6 @@ static inline bool of_coresight_legacy_ep_is_input(struct device_node *ep) return of_property_read_bool(ep, "slave-mode"); } -static void of_coresight_get_ports_legacy(const struct device_node *node, - int *nr_inport, int *nr_outport) -{ - struct device_node *ep = NULL; - struct of_endpoint endpoint; - int in = 0, out = 0; - - /* - * Avoid warnings in of_graph_get_next_endpoint() - * if the device doesn't have any graph connections - */ - if (!of_graph_is_present(node)) - return; - do { - ep = of_graph_get_next_endpoint(node, ep); - if (!ep) - break; - - if (of_graph_parse_endpoint(ep, &endpoint)) - continue; - - if (of_coresight_legacy_ep_is_input(ep)) { - in = (endpoint.port + 1 > in) ? - endpoint.port + 1 : in; - } else { - out = (endpoint.port + 1) > out ? - endpoint.port + 1 : out; - } - - } while (ep); - - *nr_inport = in; - *nr_outport = out; -} - static struct device_node *of_coresight_get_port_parent(struct device_node *ep) { struct device_node *parent = of_graph_get_port_parent(ep); @@ -134,58 +162,11 @@ static struct device_node *of_coresight_get_port_parent(struct device_node *ep) } static inline struct device_node * -of_coresight_get_input_ports_node(const struct device_node *node) -{ - return of_get_child_by_name(node, "in-ports"); -} - -static inline struct device_node * of_coresight_get_output_ports_node(const struct device_node *node) { return of_get_child_by_name(node, "out-ports"); } -static inline int -of_coresight_count_ports(struct device_node *port_parent) -{ - int i = 0; - struct device_node *ep = NULL; - struct of_endpoint endpoint; - - while ((ep = of_graph_get_next_endpoint(port_parent, ep))) { - /* Defer error handling to parsing */ - if (of_graph_parse_endpoint(ep, &endpoint)) - continue; - if (endpoint.port + 1 > i) - i = endpoint.port + 1; - } - - return i; -} - -static void of_coresight_get_ports(const struct device_node *node, - int *nr_inport, int *nr_outport) -{ - struct device_node *input_ports = NULL, *output_ports = NULL; - - input_ports = of_coresight_get_input_ports_node(node); - output_ports = of_coresight_get_output_ports_node(node); - - if (input_ports || output_ports) { - if (input_ports) { - *nr_inport = of_coresight_count_ports(input_ports); - of_node_put(input_ports); - } - if (output_ports) { - *nr_outport = of_coresight_count_ports(output_ports); - of_node_put(output_ports); - } - } else { - /* Fall back to legacy DT bindings parsing */ - of_coresight_get_ports_legacy(node, nr_inport, nr_outport); - } -} - static int of_coresight_get_cpu(struct device *dev) { int cpu; @@ -206,7 +187,7 @@ static int of_coresight_get_cpu(struct device *dev) /* * of_coresight_parse_endpoint : Parse the given output endpoint @ep - * and fill the connection information in @conn + * and fill the connection information in @pdata->out_conns * * Parses the local port, remote device name and the remote port. * @@ -224,7 +205,8 @@ static int of_coresight_parse_endpoint(struct device *dev, struct device_node *rep = NULL; struct device *rdev = NULL; struct fwnode_handle *rdev_fwnode; - struct coresight_connection *conn; + struct coresight_connection conn = {}; + struct coresight_connection *new_conn; do { /* Parse the local port details */ @@ -251,14 +233,7 @@ static int of_coresight_parse_endpoint(struct device *dev, break; } - conn = &pdata->conns[endpoint.port]; - if (conn->child_fwnode) { - dev_warn(dev, "Duplicate output port %d\n", - endpoint.port); - ret = -EINVAL; - break; - } - conn->outport = endpoint.port; + conn.src_port = endpoint.port; /* * Hold the refcount to the target device. This could be * released via: @@ -267,8 +242,14 @@ static int of_coresight_parse_endpoint(struct device *dev, * 2) While removing the target device via * coresight_remove_match() */ - conn->child_fwnode = fwnode_handle_get(rdev_fwnode); - conn->child_port = rendpoint.port; + conn.dest_fwnode = fwnode_handle_get(rdev_fwnode); + conn.dest_port = rendpoint.port; + + new_conn = coresight_add_out_conn(dev, pdata, &conn); + if (IS_ERR_VALUE(new_conn)) { + fwnode_handle_put(conn.dest_fwnode); + return PTR_ERR(new_conn); + } /* Connection record updated */ } while (0); @@ -288,17 +269,6 @@ static int of_get_coresight_platform_data(struct device *dev, bool legacy_binding = false; struct device_node *node = dev->of_node; - /* Get the number of input and output port for this component */ - of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport); - - /* If there are no output connections, we are done */ - if (!pdata->nr_outport) - return 0; - - ret = coresight_alloc_conns(dev, pdata); - if (ret) - return ret; - parent = of_coresight_get_output_ports_node(node); /* * If the DT uses obsoleted bindings, the ports are listed @@ -306,6 +276,12 @@ static int of_get_coresight_platform_data(struct device *dev, * ports. */ if (!parent) { + /* + * Avoid warnings in of_graph_get_next_endpoint() + * if the device doesn't have any graph connections + */ + if (!of_graph_is_present(node)) + return 0; legacy_binding = true; parent = node; dev_warn_once(dev, "Uses obsolete Coresight DT bindings\n"); @@ -649,8 +625,8 @@ static int acpi_coresight_parse_link(struct acpi_device *adev, dir = fields[3].integer.value; if (dir == ACPI_CORESIGHT_LINK_MASTER) { - conn->outport = fields[0].integer.value; - conn->child_port = fields[1].integer.value; + conn->src_port = fields[0].integer.value; + conn->dest_port = fields[1].integer.value; rdev = coresight_find_device_by_fwnode(&r_adev->fwnode); if (!rdev) return -EPROBE_DEFER; @@ -662,14 +638,14 @@ static int acpi_coresight_parse_link(struct acpi_device *adev, * 2) While removing the target device via * coresight_remove_match(). */ - conn->child_fwnode = fwnode_handle_get(&r_adev->fwnode); + conn->dest_fwnode = fwnode_handle_get(&r_adev->fwnode); } else if (dir == ACPI_CORESIGHT_LINK_SLAVE) { /* * We are only interested in the port number * for the input ports at this component. * Store the port number in child_port. */ - conn->child_port = fields[0].integer.value; + conn->dest_port = fields[0].integer.value; } else { /* Invalid direction */ return -EINVAL; @@ -683,14 +659,15 @@ static int acpi_coresight_parse_link(struct acpi_device *adev, * connection information and populate the supplied coresight_platform_data * instance. */ -static int acpi_coresight_parse_graph(struct acpi_device *adev, +static int acpi_coresight_parse_graph(struct device *dev, + struct acpi_device *adev, struct coresight_platform_data *pdata) { - int rc, i, nlinks; + int i, nlinks; const union acpi_object *graph; - struct coresight_connection *conns, *ptr; + struct coresight_connection conn, zero_conn = {}; + struct coresight_connection *new_conn; - pdata->nr_inport = pdata->nr_outport = 0; graph = acpi_get_coresight_graph(adev); if (!graph) return -ENOENT; @@ -699,56 +676,22 @@ static int acpi_coresight_parse_graph(struct acpi_device *adev, if (!nlinks) return 0; - /* - * To avoid scanning the table twice (once for finding the number of - * output links and then later for parsing the output links), - * cache the links information in one go and then later copy - * it to the pdata. - */ - conns = devm_kcalloc(&adev->dev, nlinks, sizeof(*conns), GFP_KERNEL); - if (!conns) - return -ENOMEM; - ptr = conns; for (i = 0; i < nlinks; i++) { const union acpi_object *link = &graph->package.elements[3 + i]; int dir; - dir = acpi_coresight_parse_link(adev, link, ptr); + conn = zero_conn; + dir = acpi_coresight_parse_link(adev, link, &conn); if (dir < 0) return dir; if (dir == ACPI_CORESIGHT_LINK_MASTER) { - if (ptr->outport >= pdata->nr_outport) - pdata->nr_outport = ptr->outport + 1; - ptr++; - } else { - WARN_ON(pdata->nr_inport == ptr->child_port + 1); - /* - * We do not track input port connections for a device. - * However we need the highest port number described, - * which can be recorded now and reuse this connection - * record for an output connection. Hence, do not move - * the ptr for input connections - */ - if (ptr->child_port >= pdata->nr_inport) - pdata->nr_inport = ptr->child_port + 1; + new_conn = coresight_add_out_conn(dev, pdata, &conn); + if (IS_ERR(new_conn)) + return PTR_ERR(new_conn); } } - rc = coresight_alloc_conns(&adev->dev, pdata); - if (rc) - return rc; - - /* Copy the connection information to the final location */ - for (i = 0; conns + i < ptr; i++) { - int port = conns[i].outport; - - /* Duplicate output port */ - WARN_ON(pdata->conns[port].child_fwnode); - pdata->conns[port] = conns[i]; - } - - devm_kfree(&adev->dev, conns); return 0; } @@ -809,7 +752,7 @@ acpi_get_coresight_platform_data(struct device *dev, if (!adev) return -EINVAL; - return acpi_coresight_parse_graph(adev, pdata); + return acpi_coresight_parse_graph(dev, adev, pdata); } #else @@ -863,7 +806,7 @@ coresight_get_platform_data(struct device *dev) error: if (!IS_ERR_OR_NULL(pdata)) /* Cleanup the connection information */ - coresight_release_platform_data(NULL, pdata); + coresight_release_platform_data(NULL, dev, pdata); return ERR_PTR(ret); } EXPORT_SYMBOL_GPL(coresight_get_platform_data); |