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authorSuzuki K Poulose <suzuki.poulose@arm.com>2019-06-19 22:53:04 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-06-20 08:56:13 +0300
commit0f5f9b6ba9e1a706f5a3b1bd467e9242ab31b352 (patch)
tree7d4ebefcc04f61613472ec9d2702aca45fc7e690 /include/linux/coresight.h
parent37ea1ffddffa63c920ce826786fe610c78f57842 (diff)
downloadlinux-0f5f9b6ba9e1a706f5a3b1bd467e9242ab31b352.tar.xz
coresight: Use platform agnostic names
So far we have reused the name of the "platform" device for the CoreSight device. But this is not very intuitive when we move to ACPI. Also, the ACPI device names have ":" in them (e.g, ARMHC97C:01), which the perf tool doesn't like very much. This patch introduces a generic naming scheme, givin more intuitive names for the devices that appear on the CoreSight bus. The names follow the pattern "prefix" followed by "index" (e.g, etm5). We maintain a list of allocated devices per "prefix" to make sure we don't allocate a new name when it is reprobed (e.g, due to unsatisifed device dependencies). So, we maintain the list of "fwnodes" of the parent devices to allocate a consistent name. All devices except the ETMs get an index allocated in the order of probing. ETMs get an index based on the CPU they are attached to. TMC devices are named using "tmc_etf", "tmc_etb", and "tmc_etr" prefixes depending on the configuration of the device. The replicators and funnels are not classified as dynamic/static anymore. One could easily figure that out by checking the presence of "mgmt" registers under sysfs. Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/coresight.h')
-rw-r--r--include/linux/coresight.h25
1 files changed, 24 insertions, 1 deletions
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index b40544bc06fe..a2b68823717b 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -168,6 +168,28 @@ struct coresight_device {
struct dev_ext_attribute *ea;
};
+/*
+ * coresight_dev_list - Mapping for devices to "name" index for device
+ * names.
+ *
+ * @nr_idx: Number of entries already allocated.
+ * @pfx: Prefix pattern for device name.
+ * @fwnode_list: Array of fwnode_handles associated with each allocated
+ * index, upto nr_idx entries.
+ */
+struct coresight_dev_list {
+ int nr_idx;
+ const char *pfx;
+ struct fwnode_handle **fwnode_list;
+};
+
+#define DEFINE_CORESIGHT_DEVLIST(var, dev_pfx) \
+static struct coresight_dev_list (var) = { \
+ .pfx = dev_pfx, \
+ .nr_idx = 0, \
+ .fwnode_list = NULL, \
+}
+
#define to_coresight_device(d) container_of(d, struct coresight_device, dev)
#define source_ops(csdev) csdev->ops->source_ops
@@ -261,7 +283,8 @@ extern int coresight_claim_device_unlocked(void __iomem *base);
extern void coresight_disclaim_device(void __iomem *base);
extern void coresight_disclaim_device_unlocked(void __iomem *base);
-
+extern char *coresight_alloc_device_name(struct coresight_dev_list *devs,
+ struct device *dev);
#else
static inline struct coresight_device *
coresight_register(struct coresight_desc *desc) { return NULL; }