mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-07-21 21:38:04 -04:00
Code Issues Packages Projects Releases Wiki Activity

firmware: tegra: bpmp: Add support for multi-socket platforms

Browse Source 
On multi-socket platforms each socket has its own BPMP that is
registered with the kernel, so the existing single fixed "bpmp"
debugfs directory name cannot accommodate more than one instance.

Group the per-socket BPMP debugfs entries under a shared top-level
/sys/kernel/debug/bpmp/ directory, with each socket's BPMP device
under a "<numa-node-id>-bpmp" subdirectory:

  /sys/kernel/debug/bpmp/0-bpmp/...
  /sys/kernel/debug/bpmp/1-bpmp/...

For a multi-socket platform, the root debugfs bpmp/ directory is created
by the first BPMP device that is populated. For single-socket platforms,
the existing directory structure is preserved.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Jon Hunter
2026-05-29 18:33:37 +01:00
committed by Thierry Reding
parent 7ba53a3d1c
commit 040eeafee0
1 changed files with 40 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

45
drivers/firmware/tegra/bpmp-debugfs.c
View File

@@ -2,6 +2,8 @@
/*
* Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
*/
#include <linux/cleanup.h>
#include <linux/debugfs.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
@@ -769,9 +771,21 @@ static int bpmp_populate_debugfs_shmem(struct tegra_bpmp *bpmp)
return err;
}
static DEFINE_MUTEX(bpmp_debugfs_root_lock);
static struct dentry *bpmp_debugfs_root;
static struct dentry *bpmp_debugfs_get_root(void)
{
guard(mutex)(&bpmp_debugfs_root_lock);
if (!bpmp_debugfs_root)
bpmp_debugfs_root = debugfs_create_dir("bpmp", NULL);
return bpmp_debugfs_root;
}
int tegra_bpmp_init_debugfs(struct tegra_bpmp *bpmp)
{
struct dentry *root;
struct dentry *root, *d;
char name[32];
bool inband;
int err;
@@ -780,11 +794,22 @@ int tegra_bpmp_init_debugfs(struct tegra_bpmp *bpmp)
if (!inband && !tegra_bpmp_mrq_is_supported(bpmp, MRQ_DEBUGFS))
return 0;
root = debugfs_create_dir("bpmp", NULL);
root = bpmp_debugfs_get_root();
if (IS_ERR(root))
return PTR_ERR(root);
bpmp->debugfs_mirror = debugfs_create_dir("debug", root);
if (dev_to_node(bpmp->dev) == NUMA_NO_NODE) {
d = root;
} else {
snprintf(name, sizeof(name), "%d-bpmp", dev_to_node(bpmp->dev));
d = debugfs_create_dir(name, root);
if (IS_ERR(d)) {
err = PTR_ERR(d);
goto out;
}
}
bpmp->debugfs_mirror = debugfs_create_dir("debug", d);
if (IS_ERR(bpmp->debugfs_mirror)) {
err = PTR_ERR(bpmp->debugfs_mirror);
goto out;
@@ -797,8 +822,18 @@ int tegra_bpmp_init_debugfs(struct tegra_bpmp *bpmp)
err = bpmp_populate_debugfs_shmem(bpmp);
out:
if (err < 0)
debugfs_remove_recursive(root);
if (err < 0) {
if (!IS_ERR(d))
debugfs_remove_recursive(d);
guard(mutex)(&bpmp_debugfs_root_lock);
if (root == d) {
bpmp_debugfs_root = NULL;
} else if (simple_empty(root)) {
debugfs_remove(root);
bpmp_debugfs_root = NULL;
}
}
return err;
}