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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/firmware/tegra/bpmp-debugfs.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/firmware/tegra/bpmp-debugfs.c')
-rw-r--r--drivers/firmware/tegra/bpmp-debugfs.c804
1 files changed, 804 insertions, 0 deletions
diff --git a/drivers/firmware/tegra/bpmp-debugfs.c b/drivers/firmware/tegra/bpmp-debugfs.c
new file mode 100644
index 0000000000..6dfe3d3410
--- /dev/null
+++ b/drivers/firmware/tegra/bpmp-debugfs.c
@@ -0,0 +1,804 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
+ */
+#include <linux/debugfs.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+
+#include <soc/tegra/bpmp.h>
+#include <soc/tegra/bpmp-abi.h>
+
+static DEFINE_MUTEX(bpmp_debug_lock);
+
+struct seqbuf {
+ char *buf;
+ size_t pos;
+ size_t size;
+};
+
+static void seqbuf_init(struct seqbuf *seqbuf, void *buf, size_t size)
+{
+ seqbuf->buf = buf;
+ seqbuf->size = size;
+ seqbuf->pos = 0;
+}
+
+static size_t seqbuf_avail(struct seqbuf *seqbuf)
+{
+ return seqbuf->pos < seqbuf->size ? seqbuf->size - seqbuf->pos : 0;
+}
+
+static size_t seqbuf_status(struct seqbuf *seqbuf)
+{
+ return seqbuf->pos <= seqbuf->size ? 0 : -EOVERFLOW;
+}
+
+static int seqbuf_eof(struct seqbuf *seqbuf)
+{
+ return seqbuf->pos >= seqbuf->size;
+}
+
+static int seqbuf_read(struct seqbuf *seqbuf, void *buf, size_t nbyte)
+{
+ nbyte = min(nbyte, seqbuf_avail(seqbuf));
+ memcpy(buf, seqbuf->buf + seqbuf->pos, nbyte);
+ seqbuf->pos += nbyte;
+ return seqbuf_status(seqbuf);
+}
+
+static int seqbuf_read_u32(struct seqbuf *seqbuf, u32 *v)
+{
+ return seqbuf_read(seqbuf, v, 4);
+}
+
+static int seqbuf_read_str(struct seqbuf *seqbuf, const char **str)
+{
+ *str = seqbuf->buf + seqbuf->pos;
+ seqbuf->pos += strnlen(*str, seqbuf_avail(seqbuf));
+ seqbuf->pos++;
+ return seqbuf_status(seqbuf);
+}
+
+static void seqbuf_seek(struct seqbuf *seqbuf, ssize_t offset)
+{
+ seqbuf->pos += offset;
+}
+
+/* map filename in Linux debugfs to corresponding entry in BPMP */
+static const char *get_filename(struct tegra_bpmp *bpmp,
+ const struct file *file, char *buf, int size)
+{
+ const char *root_path, *filename = NULL;
+ char *root_path_buf;
+ size_t root_len;
+ size_t root_path_buf_len = 512;
+
+ root_path_buf = kzalloc(root_path_buf_len, GFP_KERNEL);
+ if (!root_path_buf)
+ goto out;
+
+ root_path = dentry_path(bpmp->debugfs_mirror, root_path_buf,
+ root_path_buf_len);
+ if (IS_ERR(root_path))
+ goto out;
+
+ root_len = strlen(root_path);
+
+ filename = dentry_path(file->f_path.dentry, buf, size);
+ if (IS_ERR(filename)) {
+ filename = NULL;
+ goto out;
+ }
+
+ if (strlen(filename) < root_len || strncmp(filename, root_path, root_len)) {
+ filename = NULL;
+ goto out;
+ }
+
+ filename += root_len;
+
+out:
+ kfree(root_path_buf);
+ return filename;
+}
+
+static int mrq_debug_open(struct tegra_bpmp *bpmp, const char *name,
+ u32 *fd, u32 *len, bool write)
+{
+ struct mrq_debug_request req = {
+ .cmd = write ? CMD_DEBUG_OPEN_WO : CMD_DEBUG_OPEN_RO,
+ };
+ struct mrq_debug_response resp;
+ struct tegra_bpmp_message msg = {
+ .mrq = MRQ_DEBUG,
+ .tx = {
+ .data = &req,
+ .size = sizeof(req),
+ },
+ .rx = {
+ .data = &resp,
+ .size = sizeof(resp),
+ },
+ };
+ ssize_t sz_name;
+ int err = 0;
+
+ sz_name = strscpy(req.fop.name, name, sizeof(req.fop.name));
+ if (sz_name < 0) {
+ pr_err("File name too large: %s\n", name);
+ return -EINVAL;
+ }
+
+ err = tegra_bpmp_transfer(bpmp, &msg);
+ if (err < 0)
+ return err;
+ else if (msg.rx.ret < 0)
+ return -EINVAL;
+
+ *len = resp.fop.datalen;
+ *fd = resp.fop.fd;
+
+ return 0;
+}
+
+static int mrq_debug_close(struct tegra_bpmp *bpmp, u32 fd)
+{
+ struct mrq_debug_request req = {
+ .cmd = CMD_DEBUG_CLOSE,
+ .frd = {
+ .fd = fd,
+ },
+ };
+ struct mrq_debug_response resp;
+ struct tegra_bpmp_message msg = {
+ .mrq = MRQ_DEBUG,
+ .tx = {
+ .data = &req,
+ .size = sizeof(req),
+ },
+ .rx = {
+ .data = &resp,
+ .size = sizeof(resp),
+ },
+ };
+ int err = 0;
+
+ err = tegra_bpmp_transfer(bpmp, &msg);
+ if (err < 0)
+ return err;
+ else if (msg.rx.ret < 0)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int mrq_debug_read(struct tegra_bpmp *bpmp, const char *name,
+ char *data, size_t sz_data, u32 *nbytes)
+{
+ struct mrq_debug_request req = {
+ .cmd = CMD_DEBUG_READ,
+ };
+ struct mrq_debug_response resp;
+ struct tegra_bpmp_message msg = {
+ .mrq = MRQ_DEBUG,
+ .tx = {
+ .data = &req,
+ .size = sizeof(req),
+ },
+ .rx = {
+ .data = &resp,
+ .size = sizeof(resp),
+ },
+ };
+ u32 fd = 0, len = 0;
+ int remaining, err, close_err;
+
+ mutex_lock(&bpmp_debug_lock);
+ err = mrq_debug_open(bpmp, name, &fd, &len, 0);
+ if (err)
+ goto out;
+
+ if (len > sz_data) {
+ err = -EFBIG;
+ goto close;
+ }
+
+ req.frd.fd = fd;
+ remaining = len;
+
+ while (remaining > 0) {
+ err = tegra_bpmp_transfer(bpmp, &msg);
+ if (err < 0) {
+ goto close;
+ } else if (msg.rx.ret < 0) {
+ err = -EINVAL;
+ goto close;
+ }
+
+ if (resp.frd.readlen > remaining) {
+ pr_err("%s: read data length invalid\n", __func__);
+ err = -EINVAL;
+ goto close;
+ }
+
+ memcpy(data, resp.frd.data, resp.frd.readlen);
+ data += resp.frd.readlen;
+ remaining -= resp.frd.readlen;
+ }
+
+ *nbytes = len;
+
+close:
+ close_err = mrq_debug_close(bpmp, fd);
+ if (!err)
+ err = close_err;
+out:
+ mutex_unlock(&bpmp_debug_lock);
+ return err;
+}
+
+static int mrq_debug_write(struct tegra_bpmp *bpmp, const char *name,
+ uint8_t *data, size_t sz_data)
+{
+ struct mrq_debug_request req = {
+ .cmd = CMD_DEBUG_WRITE
+ };
+ struct mrq_debug_response resp;
+ struct tegra_bpmp_message msg = {
+ .mrq = MRQ_DEBUG,
+ .tx = {
+ .data = &req,
+ .size = sizeof(req),
+ },
+ .rx = {
+ .data = &resp,
+ .size = sizeof(resp),
+ },
+ };
+ u32 fd = 0, len = 0;
+ size_t remaining;
+ int err;
+
+ mutex_lock(&bpmp_debug_lock);
+ err = mrq_debug_open(bpmp, name, &fd, &len, 1);
+ if (err)
+ goto out;
+
+ if (sz_data > len) {
+ err = -EINVAL;
+ goto close;
+ }
+
+ req.fwr.fd = fd;
+ remaining = sz_data;
+
+ while (remaining > 0) {
+ len = min(remaining, sizeof(req.fwr.data));
+ memcpy(req.fwr.data, data, len);
+ req.fwr.datalen = len;
+
+ err = tegra_bpmp_transfer(bpmp, &msg);
+ if (err < 0) {
+ goto close;
+ } else if (msg.rx.ret < 0) {
+ err = -EINVAL;
+ goto close;
+ }
+
+ data += req.fwr.datalen;
+ remaining -= req.fwr.datalen;
+ }
+
+close:
+ err = mrq_debug_close(bpmp, fd);
+out:
+ mutex_unlock(&bpmp_debug_lock);
+ return err;
+}
+
+static int bpmp_debug_show(struct seq_file *m, void *p)
+{
+ struct file *file = m->private;
+ struct inode *inode = file_inode(file);
+ struct tegra_bpmp *bpmp = inode->i_private;
+ char fnamebuf[256];
+ const char *filename;
+ struct mrq_debug_request req = {
+ .cmd = CMD_DEBUG_READ,
+ };
+ struct mrq_debug_response resp;
+ struct tegra_bpmp_message msg = {
+ .mrq = MRQ_DEBUG,
+ .tx = {
+ .data = &req,
+ .size = sizeof(req),
+ },
+ .rx = {
+ .data = &resp,
+ .size = sizeof(resp),
+ },
+ };
+ u32 fd = 0, len = 0;
+ int remaining, err, close_err;
+
+ filename = get_filename(bpmp, file, fnamebuf, sizeof(fnamebuf));
+ if (!filename)
+ return -ENOENT;
+
+ mutex_lock(&bpmp_debug_lock);
+ err = mrq_debug_open(bpmp, filename, &fd, &len, 0);
+ if (err)
+ goto out;
+
+ req.frd.fd = fd;
+ remaining = len;
+
+ while (remaining > 0) {
+ err = tegra_bpmp_transfer(bpmp, &msg);
+ if (err < 0) {
+ goto close;
+ } else if (msg.rx.ret < 0) {
+ err = -EINVAL;
+ goto close;
+ }
+
+ if (resp.frd.readlen > remaining) {
+ pr_err("%s: read data length invalid\n", __func__);
+ err = -EINVAL;
+ goto close;
+ }
+
+ seq_write(m, resp.frd.data, resp.frd.readlen);
+ remaining -= resp.frd.readlen;
+ }
+
+close:
+ close_err = mrq_debug_close(bpmp, fd);
+ if (!err)
+ err = close_err;
+out:
+ mutex_unlock(&bpmp_debug_lock);
+ return err;
+}
+
+static ssize_t bpmp_debug_store(struct file *file, const char __user *buf,
+ size_t count, loff_t *f_pos)
+{
+ struct inode *inode = file_inode(file);
+ struct tegra_bpmp *bpmp = inode->i_private;
+ char *databuf = NULL;
+ char fnamebuf[256];
+ const char *filename;
+ ssize_t err;
+
+ filename = get_filename(bpmp, file, fnamebuf, sizeof(fnamebuf));
+ if (!filename)
+ return -ENOENT;
+
+ databuf = memdup_user(buf, count);
+ if (IS_ERR(databuf))
+ return PTR_ERR(databuf);
+
+ err = mrq_debug_write(bpmp, filename, databuf, count);
+ kfree(databuf);
+
+ return err ?: count;
+}
+
+static int bpmp_debug_open(struct inode *inode, struct file *file)
+{
+ return single_open_size(file, bpmp_debug_show, file, SZ_256K);
+}
+
+static const struct file_operations bpmp_debug_fops = {
+ .open = bpmp_debug_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .write = bpmp_debug_store,
+ .release = single_release,
+};
+
+static int bpmp_populate_debugfs_inband(struct tegra_bpmp *bpmp,
+ struct dentry *parent,
+ char *ppath)
+{
+ const size_t pathlen = SZ_256;
+ const size_t bufsize = SZ_16K;
+ struct dentry *dentry;
+ u32 dsize, attrs = 0;
+ struct seqbuf seqbuf;
+ char *buf, *pathbuf;
+ const char *name;
+ int err = 0;
+
+ if (!bpmp || !parent || !ppath)
+ return -EINVAL;
+
+ buf = kmalloc(bufsize, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ pathbuf = kzalloc(pathlen, GFP_KERNEL);
+ if (!pathbuf) {
+ kfree(buf);
+ return -ENOMEM;
+ }
+
+ err = mrq_debug_read(bpmp, ppath, buf, bufsize, &dsize);
+ if (err)
+ goto out;
+
+ seqbuf_init(&seqbuf, buf, dsize);
+
+ while (!seqbuf_eof(&seqbuf)) {
+ err = seqbuf_read_u32(&seqbuf, &attrs);
+ if (err)
+ goto out;
+
+ err = seqbuf_read_str(&seqbuf, &name);
+ if (err < 0)
+ goto out;
+
+ if (attrs & DEBUGFS_S_ISDIR) {
+ size_t len;
+
+ dentry = debugfs_create_dir(name, parent);
+ if (IS_ERR(dentry)) {
+ err = PTR_ERR(dentry);
+ goto out;
+ }
+
+ len = snprintf(pathbuf, pathlen, "%s%s/", ppath, name);
+ if (len >= pathlen) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ err = bpmp_populate_debugfs_inband(bpmp, dentry,
+ pathbuf);
+ if (err < 0)
+ goto out;
+ } else {
+ umode_t mode;
+
+ mode = attrs & DEBUGFS_S_IRUSR ? 0400 : 0;
+ mode |= attrs & DEBUGFS_S_IWUSR ? 0200 : 0;
+ dentry = debugfs_create_file(name, mode, parent, bpmp,
+ &bpmp_debug_fops);
+ if (IS_ERR(dentry)) {
+ err = -ENOMEM;
+ goto out;
+ }
+ }
+ }
+
+out:
+ kfree(pathbuf);
+ kfree(buf);
+
+ return err;
+}
+
+static int mrq_debugfs_read(struct tegra_bpmp *bpmp,
+ dma_addr_t name, size_t sz_name,
+ dma_addr_t data, size_t sz_data,
+ size_t *nbytes)
+{
+ struct mrq_debugfs_request req = {
+ .cmd = CMD_DEBUGFS_READ,
+ .fop = {
+ .fnameaddr = (u32)name,
+ .fnamelen = (u32)sz_name,
+ .dataaddr = (u32)data,
+ .datalen = (u32)sz_data,
+ },
+ };
+ struct mrq_debugfs_response resp;
+ struct tegra_bpmp_message msg = {
+ .mrq = MRQ_DEBUGFS,
+ .tx = {
+ .data = &req,
+ .size = sizeof(req),
+ },
+ .rx = {
+ .data = &resp,
+ .size = sizeof(resp),
+ },
+ };
+ int err;
+
+ err = tegra_bpmp_transfer(bpmp, &msg);
+ if (err < 0)
+ return err;
+ else if (msg.rx.ret < 0)
+ return -EINVAL;
+
+ *nbytes = (size_t)resp.fop.nbytes;
+
+ return 0;
+}
+
+static int mrq_debugfs_write(struct tegra_bpmp *bpmp,
+ dma_addr_t name, size_t sz_name,
+ dma_addr_t data, size_t sz_data)
+{
+ const struct mrq_debugfs_request req = {
+ .cmd = CMD_DEBUGFS_WRITE,
+ .fop = {
+ .fnameaddr = (u32)name,
+ .fnamelen = (u32)sz_name,
+ .dataaddr = (u32)data,
+ .datalen = (u32)sz_data,
+ },
+ };
+ struct tegra_bpmp_message msg = {
+ .mrq = MRQ_DEBUGFS,
+ .tx = {
+ .data = &req,
+ .size = sizeof(req),
+ },
+ };
+
+ return tegra_bpmp_transfer(bpmp, &msg);
+}
+
+static int mrq_debugfs_dumpdir(struct tegra_bpmp *bpmp, dma_addr_t addr,
+ size_t size, size_t *nbytes)
+{
+ const struct mrq_debugfs_request req = {
+ .cmd = CMD_DEBUGFS_DUMPDIR,
+ .dumpdir = {
+ .dataaddr = (u32)addr,
+ .datalen = (u32)size,
+ },
+ };
+ struct mrq_debugfs_response resp;
+ struct tegra_bpmp_message msg = {
+ .mrq = MRQ_DEBUGFS,
+ .tx = {
+ .data = &req,
+ .size = sizeof(req),
+ },
+ .rx = {
+ .data = &resp,
+ .size = sizeof(resp),
+ },
+ };
+ int err;
+
+ err = tegra_bpmp_transfer(bpmp, &msg);
+ if (err < 0)
+ return err;
+ else if (msg.rx.ret < 0)
+ return -EINVAL;
+
+ *nbytes = (size_t)resp.dumpdir.nbytes;
+
+ return 0;
+}
+
+static int debugfs_show(struct seq_file *m, void *p)
+{
+ struct file *file = m->private;
+ struct inode *inode = file_inode(file);
+ struct tegra_bpmp *bpmp = inode->i_private;
+ const size_t datasize = m->size;
+ const size_t namesize = SZ_256;
+ void *datavirt, *namevirt;
+ dma_addr_t dataphys, namephys;
+ char buf[256];
+ const char *filename;
+ size_t len, nbytes;
+ int err;
+
+ filename = get_filename(bpmp, file, buf, sizeof(buf));
+ if (!filename)
+ return -ENOENT;
+
+ namevirt = dma_alloc_coherent(bpmp->dev, namesize, &namephys,
+ GFP_KERNEL | GFP_DMA32);
+ if (!namevirt)
+ return -ENOMEM;
+
+ datavirt = dma_alloc_coherent(bpmp->dev, datasize, &dataphys,
+ GFP_KERNEL | GFP_DMA32);
+ if (!datavirt) {
+ err = -ENOMEM;
+ goto free_namebuf;
+ }
+
+ len = strlen(filename);
+ strncpy(namevirt, filename, namesize);
+
+ err = mrq_debugfs_read(bpmp, namephys, len, dataphys, datasize,
+ &nbytes);
+
+ if (!err)
+ seq_write(m, datavirt, nbytes);
+
+ dma_free_coherent(bpmp->dev, datasize, datavirt, dataphys);
+free_namebuf:
+ dma_free_coherent(bpmp->dev, namesize, namevirt, namephys);
+
+ return err;
+}
+
+static int debugfs_open(struct inode *inode, struct file *file)
+{
+ return single_open_size(file, debugfs_show, file, SZ_128K);
+}
+
+static ssize_t debugfs_store(struct file *file, const char __user *buf,
+ size_t count, loff_t *f_pos)
+{
+ struct inode *inode = file_inode(file);
+ struct tegra_bpmp *bpmp = inode->i_private;
+ const size_t datasize = count;
+ const size_t namesize = SZ_256;
+ void *datavirt, *namevirt;
+ dma_addr_t dataphys, namephys;
+ char fnamebuf[256];
+ const char *filename;
+ size_t len;
+ int err;
+
+ filename = get_filename(bpmp, file, fnamebuf, sizeof(fnamebuf));
+ if (!filename)
+ return -ENOENT;
+
+ namevirt = dma_alloc_coherent(bpmp->dev, namesize, &namephys,
+ GFP_KERNEL | GFP_DMA32);
+ if (!namevirt)
+ return -ENOMEM;
+
+ datavirt = dma_alloc_coherent(bpmp->dev, datasize, &dataphys,
+ GFP_KERNEL | GFP_DMA32);
+ if (!datavirt) {
+ err = -ENOMEM;
+ goto free_namebuf;
+ }
+
+ len = strlen(filename);
+ strncpy(namevirt, filename, namesize);
+
+ if (copy_from_user(datavirt, buf, count)) {
+ err = -EFAULT;
+ goto free_databuf;
+ }
+
+ err = mrq_debugfs_write(bpmp, namephys, len, dataphys,
+ count);
+
+free_databuf:
+ dma_free_coherent(bpmp->dev, datasize, datavirt, dataphys);
+free_namebuf:
+ dma_free_coherent(bpmp->dev, namesize, namevirt, namephys);
+
+ return err ?: count;
+}
+
+static const struct file_operations debugfs_fops = {
+ .open = debugfs_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .write = debugfs_store,
+ .release = single_release,
+};
+
+static int bpmp_populate_dir(struct tegra_bpmp *bpmp, struct seqbuf *seqbuf,
+ struct dentry *parent, u32 depth)
+{
+ int err;
+ u32 d, t;
+ const char *name;
+ struct dentry *dentry;
+
+ while (!seqbuf_eof(seqbuf)) {
+ err = seqbuf_read_u32(seqbuf, &d);
+ if (err < 0)
+ return err;
+
+ if (d < depth) {
+ seqbuf_seek(seqbuf, -4);
+ /* go up a level */
+ return 0;
+ } else if (d != depth) {
+ /* malformed data received from BPMP */
+ return -EIO;
+ }
+
+ err = seqbuf_read_u32(seqbuf, &t);
+ if (err < 0)
+ return err;
+ err = seqbuf_read_str(seqbuf, &name);
+ if (err < 0)
+ return err;
+
+ if (t & DEBUGFS_S_ISDIR) {
+ dentry = debugfs_create_dir(name, parent);
+ if (IS_ERR(dentry))
+ return -ENOMEM;
+ err = bpmp_populate_dir(bpmp, seqbuf, dentry, depth+1);
+ if (err < 0)
+ return err;
+ } else {
+ umode_t mode;
+
+ mode = t & DEBUGFS_S_IRUSR ? S_IRUSR : 0;
+ mode |= t & DEBUGFS_S_IWUSR ? S_IWUSR : 0;
+ dentry = debugfs_create_file(name, mode,
+ parent, bpmp,
+ &debugfs_fops);
+ if (IS_ERR(dentry))
+ return -ENOMEM;
+ }
+ }
+
+ return 0;
+}
+
+static int bpmp_populate_debugfs_shmem(struct tegra_bpmp *bpmp)
+{
+ struct seqbuf seqbuf;
+ const size_t sz = SZ_512K;
+ dma_addr_t phys;
+ size_t nbytes;
+ void *virt;
+ int err;
+
+ virt = dma_alloc_coherent(bpmp->dev, sz, &phys,
+ GFP_KERNEL | GFP_DMA32);
+ if (!virt)
+ return -ENOMEM;
+
+ err = mrq_debugfs_dumpdir(bpmp, phys, sz, &nbytes);
+ if (err < 0) {
+ goto free;
+ } else if (nbytes > sz) {
+ err = -EINVAL;
+ goto free;
+ }
+
+ seqbuf_init(&seqbuf, virt, nbytes);
+ err = bpmp_populate_dir(bpmp, &seqbuf, bpmp->debugfs_mirror, 0);
+free:
+ dma_free_coherent(bpmp->dev, sz, virt, phys);
+
+ return err;
+}
+
+int tegra_bpmp_init_debugfs(struct tegra_bpmp *bpmp)
+{
+ struct dentry *root;
+ bool inband;
+ int err;
+
+ inband = tegra_bpmp_mrq_is_supported(bpmp, MRQ_DEBUG);
+
+ if (!inband && !tegra_bpmp_mrq_is_supported(bpmp, MRQ_DEBUGFS))
+ return 0;
+
+ root = debugfs_create_dir("bpmp", NULL);
+ if (IS_ERR(root))
+ return -ENOMEM;
+
+ bpmp->debugfs_mirror = debugfs_create_dir("debug", root);
+ if (IS_ERR(bpmp->debugfs_mirror)) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ if (inband)
+ err = bpmp_populate_debugfs_inband(bpmp, bpmp->debugfs_mirror,
+ "/");
+ else
+ err = bpmp_populate_debugfs_shmem(bpmp);
+
+out:
+ if (err < 0)
+ debugfs_remove_recursive(root);
+
+ return err;
+}