forked from Minki/linux
perf/arm-cmn: Add debugfs topology info
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@arm.com> Link: https://lore.kernel.org/r/159fd4d7e19fb3c8801a8cb64ee73ec50f55903c.1638530442.git.robin.murphy@arm.com Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Robin Murphy
Will Deacon
parent
b2fea780c9
commit
a88fa6c28b
@ -5,6 +5,7 @@
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#include <linux/acpi.h>
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#include <linux/bitfield.h>
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#include <linux/bitops.h>
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#include <linux/debugfs.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/io-64-nonatomic-lo-hi.h>
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@ -287,6 +288,7 @@ struct arm_cmn {
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struct hlist_node cpuhp_node;
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struct pmu pmu;
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struct dentry *debug;
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};
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#define to_cmn(p) container_of(p, struct arm_cmn, pmu)
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@ -351,6 +353,140 @@ static struct arm_cmn_node *arm_cmn_node(const struct arm_cmn *cmn,
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return NULL;
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}
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struct dentry *arm_cmn_debugfs;
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#ifdef CONFIG_DEBUG_FS
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static const char *arm_cmn_device_type(u8 type)
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{
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switch(type) {
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case 0x01: return " RN-I |";
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case 0x02: return " RN-D |";
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case 0x04: return " RN-F_B |";
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case 0x05: return "RN-F_B_E|";
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case 0x06: return " RN-F_A |";
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case 0x07: return "RN-F_A_E|";
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case 0x08: return " HN-T |";
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case 0x09: return " HN-I |";
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case 0x0a: return " HN-D |";
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case 0x0c: return " SN-F |";
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case 0x0d: return " SBSX |";
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case 0x0e: return " HN-F |";
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case 0x0f: return " SN-F_E |";
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case 0x10: return " SN-F_D |";
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case 0x11: return " CXHA |";
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case 0x12: return " CXRA |";
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case 0x13: return " CXRH |";
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case 0x14: return " RN-F_D |";
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case 0x15: return "RN-F_D_E|";
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case 0x16: return " RN-F_C |";
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case 0x17: return "RN-F_C_E|";
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case 0x1c: return " MTSX |";
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default: return " |";
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}
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}
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static void arm_cmn_show_logid(struct seq_file *s, int x, int y, int p, int d)
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{
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struct arm_cmn *cmn = s->private;
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struct arm_cmn_node *dn;
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for (dn = cmn->dns; dn->type; dn++) {
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struct arm_cmn_nodeid nid = arm_cmn_nid(cmn, dn->id);
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if (dn->type == CMN_TYPE_XP)
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continue;
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/* Ignore the extra components that will overlap on some ports */
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if (dn->type < CMN_TYPE_HNI)
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continue;
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if (nid.x != x || nid.y != y || nid.port != p || nid.dev != d)
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continue;
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seq_printf(s, " #%-2d |", dn->logid);
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return;
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}
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seq_puts(s, " |");
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}
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static int arm_cmn_map_show(struct seq_file *s, void *data)
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{
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struct arm_cmn *cmn = s->private;
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int x, y, p, pmax = fls(cmn->ports_used);
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seq_puts(s, " X");
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for (x = 0; x < cmn->mesh_x; x++)
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seq_printf(s, " %d ", x);
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seq_puts(s, "\nY P D+");
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y = cmn->mesh_y;
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while (y--) {
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int xp_base = cmn->mesh_x * y;
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u8 port[6][CMN_MAX_DIMENSION];
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for (x = 0; x < cmn->mesh_x; x++)
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seq_puts(s, "--------+");
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seq_printf(s, "\n%d |", y);
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for (x = 0; x < cmn->mesh_x; x++) {
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struct arm_cmn_node *xp = cmn->xps + xp_base + x;
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void __iomem *base = xp->pmu_base - CMN_PMU_OFFSET;
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port[0][x] = readl_relaxed(base + CMN_MXP__CONNECT_INFO_P0);
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port[1][x] = readl_relaxed(base + CMN_MXP__CONNECT_INFO_P1);
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port[2][x] = readl_relaxed(base + CMN_MXP__CONNECT_INFO_P2);
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port[3][x] = readl_relaxed(base + CMN_MXP__CONNECT_INFO_P3);
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port[4][x] = readl_relaxed(base + CMN_MXP__CONNECT_INFO_P4);
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port[5][x] = readl_relaxed(base + CMN_MXP__CONNECT_INFO_P5);
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seq_printf(s, " XP #%-2d |", xp_base + x);
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}
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seq_puts(s, "\n |");
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for (x = 0; x < cmn->mesh_x; x++) {
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u8 dtc = cmn->xps[xp_base + x].dtc;
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if (dtc & (dtc - 1))
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seq_puts(s, " DTC ?? |");
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else
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seq_printf(s, " DTC %ld |", __ffs(dtc));
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}
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seq_puts(s, "\n |");
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for (x = 0; x < cmn->mesh_x; x++)
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seq_puts(s, "........|");
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for (p = 0; p < pmax; p++) {
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seq_printf(s, "\n %d |", p);
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for (x = 0; x < cmn->mesh_x; x++)
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seq_puts(s, arm_cmn_device_type(port[p][x]));
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seq_puts(s, "\n 0|");
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for (x = 0; x < cmn->mesh_x; x++)
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arm_cmn_show_logid(s, x, y, p, 0);
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seq_puts(s, "\n 1|");
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for (x = 0; x < cmn->mesh_x; x++)
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arm_cmn_show_logid(s, x, y, p, 1);
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}
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seq_puts(s, "\n-----+");
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}
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for (x = 0; x < cmn->mesh_x; x++)
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seq_puts(s, "--------+");
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seq_puts(s, "\n");
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(arm_cmn_map);
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static void arm_cmn_debugfs_init(struct arm_cmn *cmn, int id)
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{
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const char *name = "map";
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if (id > 0)
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name = devm_kasprintf(cmn->dev, GFP_KERNEL, "map_%d", id);
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if (!name)
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return;
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cmn->debug = debugfs_create_file(name, 0444, arm_cmn_debugfs, cmn, &arm_cmn_map_fops);
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}
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#else
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static void arm_cmn_debugfs_init(struct arm_cmn *cmn, int id) {}
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#endif
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struct arm_cmn_hw_event {
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struct arm_cmn_node *dn;
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u64 dtm_idx[2];
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@ -1738,7 +1874,7 @@ static int arm_cmn_probe(struct platform_device *pdev)
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struct arm_cmn *cmn;
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const char *name;
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static atomic_t id;
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int err, rootnode;
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int err, rootnode, this_id;
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cmn = devm_kzalloc(&pdev->dev, sizeof(*cmn), GFP_KERNEL);
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if (!cmn)
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@ -1792,7 +1928,8 @@ static int arm_cmn_probe(struct platform_device *pdev)
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.cancel_txn = arm_cmn_end_txn,
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};
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name = devm_kasprintf(cmn->dev, GFP_KERNEL, "arm_cmn_%d", atomic_fetch_inc(&id));
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this_id = atomic_fetch_inc(&id);
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name = devm_kasprintf(cmn->dev, GFP_KERNEL, "arm_cmn_%d", this_id);
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if (!name)
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return -ENOMEM;
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@ -1803,6 +1940,8 @@ static int arm_cmn_probe(struct platform_device *pdev)
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err = perf_pmu_register(&cmn->pmu, name, -1);
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if (err)
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cpuhp_state_remove_instance_nocalls(arm_cmn_hp_state, &cmn->cpuhp_node);
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else
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arm_cmn_debugfs_init(cmn, this_id);
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return err;
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}
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@ -1815,6 +1954,7 @@ static int arm_cmn_remove(struct platform_device *pdev)
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perf_pmu_unregister(&cmn->pmu);
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cpuhp_state_remove_instance_nocalls(arm_cmn_hp_state, &cmn->cpuhp_node);
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debugfs_remove(cmn->debug);
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return 0;
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}
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@ -1857,9 +1997,13 @@ static int __init arm_cmn_init(void)
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return ret;
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arm_cmn_hp_state = ret;
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arm_cmn_debugfs = debugfs_create_dir("arm-cmn", NULL);
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ret = platform_driver_register(&arm_cmn_driver);
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if (ret)
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if (ret) {
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cpuhp_remove_multi_state(arm_cmn_hp_state);
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debugfs_remove(arm_cmn_debugfs);
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}
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return ret;
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}
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@ -1867,6 +2011,7 @@ static void __exit arm_cmn_exit(void)
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{
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platform_driver_unregister(&arm_cmn_driver);
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cpuhp_remove_multi_state(arm_cmn_hp_state);
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debugfs_remove(arm_cmn_debugfs);
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}
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module_init(arm_cmn_init);
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