[PATCH 14/14] perf/arm-cmn: Add debugfs topology info
Robin Murphy
robin.murphy at arm.com
Fri Dec 3 03:45:03 PST 2021
In general, detailed performance analysis will require knoweldge of the
the SoC beyond the CMN itself - e.g. which actual CPUs/peripherals/etc.
are connected to each node. However for certain development and bringup
tasks it can be useful to have a quick overview of the CMN internal
topology to hand too. Add a debugfs file to map this out.
Signed-off-by: Robin Murphy <robin.murphy at arm.com>
---
drivers/perf/arm-cmn.c | 151 ++++++++++++++++++++++++++++++++++++++++-
1 file changed, 148 insertions(+), 3 deletions(-)
diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c
index 28ab87a6cde4..0e48adce57ef 100644
--- a/drivers/perf/arm-cmn.c
+++ b/drivers/perf/arm-cmn.c
@@ -5,6 +5,7 @@
#include <linux/acpi.h>
#include <linux/bitfield.h>
#include <linux/bitops.h>
+#include <linux/debugfs.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/io-64-nonatomic-lo-hi.h>
@@ -287,6 +288,7 @@ struct arm_cmn {
struct hlist_node cpuhp_node;
struct pmu pmu;
+ struct dentry *debug;
};
#define to_cmn(p) container_of(p, struct arm_cmn, pmu)
@@ -351,6 +353,140 @@ static struct arm_cmn_node *arm_cmn_node(const struct arm_cmn *cmn,
return NULL;
}
+struct dentry *arm_cmn_debugfs;
+
+#ifdef CONFIG_DEBUG_FS
+static const char *arm_cmn_device_type(u8 type)
+{
+ switch(type) {
+ case 0x01: return " RN-I |";
+ case 0x02: return " RN-D |";
+ case 0x04: return " RN-F_B |";
+ case 0x05: return "RN-F_B_E|";
+ case 0x06: return " RN-F_A |";
+ case 0x07: return "RN-F_A_E|";
+ case 0x08: return " HN-T |";
+ case 0x09: return " HN-I |";
+ case 0x0a: return " HN-D |";
+ case 0x0c: return " SN-F |";
+ case 0x0d: return " SBSX |";
+ case 0x0e: return " HN-F |";
+ case 0x0f: return " SN-F_E |";
+ case 0x10: return " SN-F_D |";
+ case 0x11: return " CXHA |";
+ case 0x12: return " CXRA |";
+ case 0x13: return " CXRH |";
+ case 0x14: return " RN-F_D |";
+ case 0x15: return "RN-F_D_E|";
+ case 0x16: return " RN-F_C |";
+ case 0x17: return "RN-F_C_E|";
+ case 0x1c: return " MTSX |";
+ default: return " |";
+ }
+}
+
+static void arm_cmn_show_logid(struct seq_file *s, int x, int y, int p, int d)
+{
+ struct arm_cmn *cmn = s->private;
+ struct arm_cmn_node *dn;
+
+ for (dn = cmn->dns; dn->type; dn++) {
+ struct arm_cmn_nodeid nid = arm_cmn_nid(cmn, dn->id);
+
+ if (dn->type == CMN_TYPE_XP)
+ continue;
+ /* Ignore the extra components that will overlap on some ports */
+ if (dn->type < CMN_TYPE_HNI)
+ continue;
+
+ if (nid.x != x || nid.y != y || nid.port != p || nid.dev != d)
+ continue;
+
+ seq_printf(s, " #%-2d |", dn->logid);
+ return;
+ }
+ seq_puts(s, " |");
+}
+
+static int arm_cmn_map_show(struct seq_file *s, void *data)
+{
+ struct arm_cmn *cmn = s->private;
+ int x, y, p, pmax = fls(cmn->ports_used);
+
+ seq_puts(s, " X");
+ for (x = 0; x < cmn->mesh_x; x++)
+ seq_printf(s, " %d ", x);
+ seq_puts(s, "\nY P D+");
+ y = cmn->mesh_y;
+ while (y--) {
+ int xp_base = cmn->mesh_x * y;
+ u8 port[6][CMN_MAX_DIMENSION];
+
+ for (x = 0; x < cmn->mesh_x; x++)
+ seq_puts(s, "--------+");
+
+ seq_printf(s, "\n%d |", y);
+ for (x = 0; x < cmn->mesh_x; x++) {
+ struct arm_cmn_node *xp = cmn->xps + xp_base + x;
+ void __iomem *base = xp->pmu_base - CMN_PMU_OFFSET;
+
+ port[0][x] = readl_relaxed(base + CMN_MXP__CONNECT_INFO_P0);
+ port[1][x] = readl_relaxed(base + CMN_MXP__CONNECT_INFO_P1);
+ port[2][x] = readl_relaxed(base + CMN_MXP__CONNECT_INFO_P2);
+ port[3][x] = readl_relaxed(base + CMN_MXP__CONNECT_INFO_P3);
+ port[4][x] = readl_relaxed(base + CMN_MXP__CONNECT_INFO_P4);
+ port[5][x] = readl_relaxed(base + CMN_MXP__CONNECT_INFO_P5);
+ seq_printf(s, " XP #%-2d |", xp_base + x);
+ }
+
+ seq_puts(s, "\n |");
+ for (x = 0; x < cmn->mesh_x; x++) {
+ u8 dtc = cmn->xps[xp_base + x].dtc;
+
+ if (dtc & (dtc - 1))
+ seq_puts(s, " DTC ?? |");
+ else
+ seq_printf(s, " DTC %ld |", __ffs(dtc));
+ }
+ seq_puts(s, "\n |");
+ for (x = 0; x < cmn->mesh_x; x++)
+ seq_puts(s, "........|");
+
+ for (p = 0; p < pmax; p++) {
+ seq_printf(s, "\n %d |", p);
+ for (x = 0; x < cmn->mesh_x; x++)
+ seq_puts(s, arm_cmn_device_type(port[p][x]));
+ seq_puts(s, "\n 0|");
+ for (x = 0; x < cmn->mesh_x; x++)
+ arm_cmn_show_logid(s, x, y, p, 0);
+ seq_puts(s, "\n 1|");
+ for (x = 0; x < cmn->mesh_x; x++)
+ arm_cmn_show_logid(s, x, y, p, 1);
+ }
+ seq_puts(s, "\n-----+");
+ }
+ for (x = 0; x < cmn->mesh_x; x++)
+ seq_puts(s, "--------+");
+ seq_puts(s, "\n");
+ return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(arm_cmn_map);
+
+static void arm_cmn_debugfs_init(struct arm_cmn *cmn, int id)
+{
+ const char *name = "map";
+
+ if (id > 0)
+ name = devm_kasprintf(cmn->dev, GFP_KERNEL, "map_%d", id);
+ if (!name)
+ return;
+
+ cmn->debug = debugfs_create_file(name, 0444, arm_cmn_debugfs, cmn, &arm_cmn_map_fops);
+}
+#else
+static void arm_cmn_debugfs_init(struct arm_cmn *cmn, int id) {}
+#endif
+
struct arm_cmn_hw_event {
struct arm_cmn_node *dn;
u64 dtm_idx[2];
@@ -1738,7 +1874,7 @@ static int arm_cmn_probe(struct platform_device *pdev)
struct arm_cmn *cmn;
const char *name;
static atomic_t id;
- int err, rootnode;
+ int err, rootnode, this_id;
cmn = devm_kzalloc(&pdev->dev, sizeof(*cmn), GFP_KERNEL);
if (!cmn)
@@ -1792,7 +1928,8 @@ static int arm_cmn_probe(struct platform_device *pdev)
.cancel_txn = arm_cmn_end_txn,
};
- name = devm_kasprintf(cmn->dev, GFP_KERNEL, "arm_cmn_%d", atomic_fetch_inc(&id));
+ this_id = atomic_fetch_inc(&id);
+ name = devm_kasprintf(cmn->dev, GFP_KERNEL, "arm_cmn_%d", this_id);
if (!name)
return -ENOMEM;
@@ -1803,6 +1940,8 @@ static int arm_cmn_probe(struct platform_device *pdev)
err = perf_pmu_register(&cmn->pmu, name, -1);
if (err)
cpuhp_state_remove_instance_nocalls(arm_cmn_hp_state, &cmn->cpuhp_node);
+ else
+ arm_cmn_debugfs_init(cmn, this_id);
return err;
}
@@ -1815,6 +1954,7 @@ static int arm_cmn_remove(struct platform_device *pdev)
perf_pmu_unregister(&cmn->pmu);
cpuhp_state_remove_instance_nocalls(arm_cmn_hp_state, &cmn->cpuhp_node);
+ debugfs_remove(cmn->debug);
return 0;
}
@@ -1857,9 +1997,13 @@ static int __init arm_cmn_init(void)
return ret;
arm_cmn_hp_state = ret;
+ arm_cmn_debugfs = debugfs_create_dir("arm-cmn", NULL);
+
ret = platform_driver_register(&arm_cmn_driver);
- if (ret)
+ if (ret) {
cpuhp_remove_multi_state(arm_cmn_hp_state);
+ debugfs_remove(arm_cmn_debugfs);
+ }
return ret;
}
@@ -1867,6 +2011,7 @@ static void __exit arm_cmn_exit(void)
{
platform_driver_unregister(&arm_cmn_driver);
cpuhp_remove_multi_state(arm_cmn_hp_state);
+ debugfs_remove(arm_cmn_debugfs);
}
module_init(arm_cmn_init);
--
2.28.0.dirty
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