Re: [RFC PATCH v3 07/16] coresight: cti: Add device tree support for impdef CTI.

Abbreviation or shorthands like "impdef" are sure to attrack criticism. To me using the work "custom" in the subject would work just as well. Using "implementation defined" elsewhere in the code to match the documentation is a good idea.

On Wed, Jun 05, 2019 at 08:03:04PM +0100, Mike Leach wrote:

Adds support for CTIs that are implementation defined at design time, and not constrained by v8 architecture.

These CTIs have no standard connection setup, all the settings have to be defined in the device tree files. The patch creates a set of connections and trigger signals based on the information provided.

Signed-off-by: Mike Leach mike.leach@linaro.org

.../coresight/coresight-cti-platform.c | 202 +++++++++++++++++- 1 file changed, 197 insertions(+), 5 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-cti-platform.c b/drivers/hwtracing/coresight/coresight-cti-platform.c index 2fb7d356e9c9..806941e1011e 100644 --- a/drivers/hwtracing/coresight/coresight-cti-platform.c +++ b/drivers/hwtracing/coresight/coresight-cti-platform.c @@ -12,10 +12,19 @@ #define NR_V8PE_OUT_SIGS 3 #define NR_V8ETM_INOUT_SIGS 4 +/* CTI device tree trigger connection node keyword */ +#define CTI_DT_CONNS "trig-conns"

/* CTI device tree connection property keywords */ #define CTI_DT_V8ARCH "arm,cti-v8-arch" #define CTI_DT_CSDEV_ASSOC "arm,cs-dev-assoc" #define CTI_DT_CTM_ID "arm,cti-ctm-id" +#define CTI_DT_TRIGIN_SIGS "arm,trig-in-sigs" +#define CTI_DT_TRIGOUT_SIGS "arm,trig-out-sigs" +#define CTI_DT_TRIGIN_TYPES "arm,trig-in-types" +#define CTI_DT_TRIGOUT_TYPES "arm,trig-out-types" +#define CTI_DT_FILTER_OUT_SIGS "arm,trig-filters" +#define CTI_DT_CONN_NAME "arm,trig-conn-name" /*

• Find a registered coresight device from a device fwnode.

@@ -210,6 +219,182 @@ static int of_cti_create_v8_connections(struct device *dev, return ret; } +static int of_cti_read_trig_group(struct cti_trig_grp **trig_grp_ptr,

• 		  struct device_node *np,
  

• 		  const char *grp_name,
  

• 		  int max_trigs)
  

+{

• int items, err = 0;
• u32 value, pidx;
• struct cti_trig_grp *grp;
• grp = kzalloc(sizeof(struct cti_trig_grp), GFP_KERNEL);
• if (!grp)

• return -ENOMEM;
  

• *trig_grp_ptr = grp;
• items = of_property_count_elems_of_size(np, grp_name, 4);
• /* if the property doesn't exist or has no values, then return

• * an empty connection group
  

• */
  

• if (items < 0)

• return 0;
  

• if (items > max_trigs)

• return -EINVAL;
  

• /* set the number of signals and usage mask */
• for (pidx = 0; pidx < items; pidx++) {

• err = of_property_read_u32_index(np, grp_name, pidx, &value);
  

• if (err)
  

• 	return err;
  

• grp->nr_sigs++;
  

• grp->used_mask |= (0x1 << value);
  

• }
• return 0;

+}

+static int of_cti_read_trig_types(struct cti_trig_grp *trig_grp_ptr,

• 		  struct device_node *np,
  

• 		  const char *type_name)
  

+{

• int items, used = 0, err = 0, nr_sigs;
• u32 value, i;
• /* allocate an array according to number of signals in connection */
• nr_sigs = trig_grp_ptr->nr_sigs;
• if (!nr_sigs)

• return 0;
  

• trig_grp_ptr->sig_types = kcalloc(nr_sigs, sizeof(int), GFP_KERNEL);
• if (!trig_grp_ptr->sig_types)

• return -ENOMEM;
  

• /* see if any types have been included in the device description */
• items = of_property_count_elems_of_size(np, type_name, 4);
• /*

• * Match type id to signal index,
  

• * too few - default to genio,
  

• * too many - ignore excess.
  

• */
  

• for (i = 0; i < nr_sigs; i++) {

• if (used < items) {
  

• 	err = of_property_read_u32_index(np, type_name,
  

• 					 i, &value);
  

• 	if (!err)
  

• 		trig_grp_ptr->sig_types[i] = value;
  

• 	else
  

• 		trig_grp_ptr->sig_types[i] = CTITRIG_GEN_IO;
  

• 	used++;
  

• } else
  

• 	trig_grp_ptr->sig_types[i] = CTITRIG_GEN_IO;
  

• }
• return 0;

+}

+static void of_cti_free_trig_grp(struct cti_trig_grp *grp) +{

• if (grp) {

• kfree(grp->sig_types);
  

• kfree(grp);
  

• }

+}

+static int of_cti_create_connection(struct device *dev,

• 		    struct cti_drvdata *drvdata,
  

• 		    struct device_node *np)
  

+{

• struct cti_trig_grp *in = 0, *out = 0, *filter = 0;
• int cpuid = -1, err = 0, trig_max = drvdata->config.nr_trig_max;
• struct device_node *cs_np;
• struct coresight_device *csdev = NULL;
• const char *assoc_name = "unknown";
• char cpu_name_str[16];
• struct fwnode_handle *r_fwnode;
• /* look for the signals properties. */
• err = of_cti_read_trig_group(&in, np, CTI_DT_TRIGIN_SIGS, trig_max);
• if (err)

• goto of_create_con_err;
  

• err = of_cti_read_trig_types(in, np, CTI_DT_TRIGIN_TYPES);
• if (err)

• goto of_create_con_err;
  

• err = of_cti_read_trig_group(&out, np, CTI_DT_TRIGOUT_SIGS, trig_max);
• if (err)

• goto of_create_con_err;
  

• err = of_cti_read_trig_types(out, np, CTI_DT_TRIGOUT_TYPES);
• if (err)

• goto of_create_con_err;
  

• err = of_cti_read_trig_group(&filter, np, CTI_DT_FILTER_OUT_SIGS,

• 		     trig_max);
  

• if (err)

• goto of_create_con_err;
  

• /* read the connection name if set - may be overridden by later */
• of_property_read_string(np, CTI_DT_CONN_NAME, &assoc_name);
• /* associated cpu ? */
• cpuid = of_cti_get_cpu(np);
• if (cpuid >= 0) {

• drvdata->ctidev.cpu = cpuid;
  

• scnprintf(cpu_name_str, 16, "cpu%d", cpuid);
  

• assoc_name = cpu_name_str;
  

• } else {

• /* associated device ? */
  

• cs_np = of_parse_phandle(np,  CTI_DT_CSDEV_ASSOC, 0);
  

• if (cs_np) {
  

• 	r_fwnode = of_fwnode_handle(cs_np);
  

• 	csdev = cti_get_assoc_csdev_by_fwnode(r_fwnode);
  

• 	if (csdev) /* use device name if csdev found */
  

• 		assoc_name = dev_name(&csdev->dev);
  

• 	else  /* otherwise node name for later association */
  

• 		assoc_name = cs_np->full_name;
  

• 	of_node_put(cs_np);
  

• }
  

• }
• /* set up a connection */
• err = cti_add_connection_entry(drvdata, in, out, csdev, assoc_name);
• if (err)

• goto of_create_con_err;
  

• /* note any filter info */
• drvdata->config.trig_out_filter |= filter->used_mask;
• kfree(filter);
• return err;

+of_create_con_err:

• of_cti_free_trig_grp(in);
• of_cti_free_trig_grp(out);
• of_cti_free_trig_grp(filter);
• return err;

+}

+static int of_cti_create_impdef_connections(struct device *dev,

• 			    struct cti_drvdata *drvdata,
  

• 			    struct device_node *np)
  

+{

• int rc = 0;
• struct device_node *nc = NULL;
• for_each_child_of_node(np, nc) {

• if (of_node_cmp(nc->name, CTI_DT_CONNS) != 0)
  

• 	continue;
  

• rc = of_cti_create_connection(dev, drvdata, nc);
  

• if (rc != 0)
  

• 	goto of_cti_impdef_create_err;
  

• }
• return rc;

+of_cti_impdef_create_err:

• /* last create should have freed its mem - unpick previous */
• cti_free_conn_info(drvdata);
• return rc;

+}

/* get the hardware configuration & connection data. */ int of_cti_get_hw_data(struct device *dev, struct device_node *np, @@ -218,12 +403,19 @@ int of_cti_get_hw_data(struct device *dev, int rc = 0; struct cti_device *cti_dev = &drvdata->ctidev;

• /* check for a v8 architectural CTI device */
• if (of_property_read_bool(np, CTI_DT_V8ARCH)) {

• /* get any CTM ID - defaults to 0 */
• of_property_read_u32(np, CTI_DT_CTM_ID, &cti_dev->ctm_id);
• /*

• * Check for a v8 architectural CTI device,
  

• * otherwise implementation defined.
  

• */
  

• if (of_property_read_bool(np, CTI_DT_V8ARCH)) rc = of_cti_create_v8_connections(dev, drvdata, np);

• if (rc)
  

• 	return rc;
  

• }

• else

• rc = of_cti_create_impdef_connections(dev, drvdata, np);
  

• if (rc)

• return rc;
  

/* if no connections, just add a single default based on max IN-OUT */ if (cti_dev->nr_trig_con == 0) -- 2.20.1

---

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