801 lines
16 KiB
C
801 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
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*/
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#include <linux/debugfs.h>
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#include <linux/dma-mapping.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <soc/tegra/bpmp.h>
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#include <soc/tegra/bpmp-abi.h>
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static DEFINE_MUTEX(bpmp_debug_lock);
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struct seqbuf {
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char *buf;
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size_t pos;
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size_t size;
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};
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static void seqbuf_init(struct seqbuf *seqbuf, void *buf, size_t size)
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{
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seqbuf->buf = buf;
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seqbuf->size = size;
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seqbuf->pos = 0;
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}
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static size_t seqbuf_avail(struct seqbuf *seqbuf)
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{
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return seqbuf->pos < seqbuf->size ? seqbuf->size - seqbuf->pos : 0;
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}
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static size_t seqbuf_status(struct seqbuf *seqbuf)
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{
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return seqbuf->pos <= seqbuf->size ? 0 : -EOVERFLOW;
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}
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static int seqbuf_eof(struct seqbuf *seqbuf)
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{
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return seqbuf->pos >= seqbuf->size;
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}
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static int seqbuf_read(struct seqbuf *seqbuf, void *buf, size_t nbyte)
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{
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nbyte = min(nbyte, seqbuf_avail(seqbuf));
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memcpy(buf, seqbuf->buf + seqbuf->pos, nbyte);
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seqbuf->pos += nbyte;
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return seqbuf_status(seqbuf);
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}
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static int seqbuf_read_u32(struct seqbuf *seqbuf, u32 *v)
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{
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return seqbuf_read(seqbuf, v, 4);
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}
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static int seqbuf_read_str(struct seqbuf *seqbuf, const char **str)
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{
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*str = seqbuf->buf + seqbuf->pos;
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seqbuf->pos += strnlen(*str, seqbuf_avail(seqbuf));
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seqbuf->pos++;
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return seqbuf_status(seqbuf);
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}
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static void seqbuf_seek(struct seqbuf *seqbuf, ssize_t offset)
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{
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seqbuf->pos += offset;
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}
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/* map filename in Linux debugfs to corresponding entry in BPMP */
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static const char *get_filename(struct tegra_bpmp *bpmp,
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const struct file *file, char *buf, int size)
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{
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const char *root_path, *filename = NULL;
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char *root_path_buf;
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size_t root_len;
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size_t root_path_buf_len = 512;
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root_path_buf = kzalloc(root_path_buf_len, GFP_KERNEL);
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if (!root_path_buf)
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goto out;
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root_path = dentry_path(bpmp->debugfs_mirror, root_path_buf,
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root_path_buf_len);
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if (IS_ERR(root_path))
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goto out;
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root_len = strlen(root_path);
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filename = dentry_path(file->f_path.dentry, buf, size);
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if (IS_ERR(filename)) {
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filename = NULL;
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goto out;
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}
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if (strlen(filename) < root_len || strncmp(filename, root_path, root_len)) {
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filename = NULL;
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goto out;
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}
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filename += root_len;
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out:
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kfree(root_path_buf);
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return filename;
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}
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static int mrq_debug_open(struct tegra_bpmp *bpmp, const char *name,
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u32 *fd, u32 *len, bool write)
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{
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struct mrq_debug_request req = {
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.cmd = write ? CMD_DEBUG_OPEN_WO : CMD_DEBUG_OPEN_RO,
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};
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struct mrq_debug_response resp;
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struct tegra_bpmp_message msg = {
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.mrq = MRQ_DEBUG,
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.tx = {
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.data = &req,
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.size = sizeof(req),
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},
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.rx = {
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.data = &resp,
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.size = sizeof(resp),
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},
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};
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ssize_t sz_name;
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int err = 0;
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sz_name = strscpy(req.fop.name, name, sizeof(req.fop.name));
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if (sz_name < 0) {
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pr_err("File name too large: %s\n", name);
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return -EINVAL;
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}
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err = tegra_bpmp_transfer(bpmp, &msg);
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if (err < 0)
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return err;
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else if (msg.rx.ret < 0)
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return -EINVAL;
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*len = resp.fop.datalen;
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*fd = resp.fop.fd;
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return 0;
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}
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static int mrq_debug_close(struct tegra_bpmp *bpmp, u32 fd)
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{
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struct mrq_debug_request req = {
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.cmd = CMD_DEBUG_CLOSE,
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.frd = {
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.fd = fd,
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},
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};
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struct mrq_debug_response resp;
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struct tegra_bpmp_message msg = {
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.mrq = MRQ_DEBUG,
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.tx = {
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.data = &req,
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.size = sizeof(req),
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},
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.rx = {
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.data = &resp,
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.size = sizeof(resp),
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},
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};
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int err = 0;
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err = tegra_bpmp_transfer(bpmp, &msg);
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if (err < 0)
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return err;
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else if (msg.rx.ret < 0)
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return -EINVAL;
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return 0;
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}
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static int mrq_debug_read(struct tegra_bpmp *bpmp, const char *name,
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char *data, size_t sz_data, u32 *nbytes)
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{
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struct mrq_debug_request req = {
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.cmd = CMD_DEBUG_READ,
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};
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struct mrq_debug_response resp;
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struct tegra_bpmp_message msg = {
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.mrq = MRQ_DEBUG,
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.tx = {
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.data = &req,
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.size = sizeof(req),
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},
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.rx = {
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.data = &resp,
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.size = sizeof(resp),
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},
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};
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u32 fd = 0, len = 0;
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int remaining, err;
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mutex_lock(&bpmp_debug_lock);
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err = mrq_debug_open(bpmp, name, &fd, &len, 0);
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if (err)
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goto out;
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if (len > sz_data) {
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err = -EFBIG;
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goto close;
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}
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req.frd.fd = fd;
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remaining = len;
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while (remaining > 0) {
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err = tegra_bpmp_transfer(bpmp, &msg);
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if (err < 0) {
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goto close;
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} else if (msg.rx.ret < 0) {
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err = -EINVAL;
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goto close;
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}
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if (resp.frd.readlen > remaining) {
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pr_err("%s: read data length invalid\n", __func__);
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err = -EINVAL;
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goto close;
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}
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memcpy(data, resp.frd.data, resp.frd.readlen);
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data += resp.frd.readlen;
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remaining -= resp.frd.readlen;
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}
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*nbytes = len;
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close:
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err = mrq_debug_close(bpmp, fd);
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out:
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mutex_unlock(&bpmp_debug_lock);
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return err;
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}
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static int mrq_debug_write(struct tegra_bpmp *bpmp, const char *name,
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uint8_t *data, size_t sz_data)
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{
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struct mrq_debug_request req = {
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.cmd = CMD_DEBUG_WRITE
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};
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struct mrq_debug_response resp;
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struct tegra_bpmp_message msg = {
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.mrq = MRQ_DEBUG,
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.tx = {
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.data = &req,
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.size = sizeof(req),
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},
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.rx = {
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.data = &resp,
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.size = sizeof(resp),
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},
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};
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u32 fd = 0, len = 0;
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size_t remaining;
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int err;
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mutex_lock(&bpmp_debug_lock);
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err = mrq_debug_open(bpmp, name, &fd, &len, 1);
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if (err)
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goto out;
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if (sz_data > len) {
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err = -EINVAL;
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goto close;
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}
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req.fwr.fd = fd;
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remaining = sz_data;
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while (remaining > 0) {
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len = min(remaining, sizeof(req.fwr.data));
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memcpy(req.fwr.data, data, len);
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req.fwr.datalen = len;
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err = tegra_bpmp_transfer(bpmp, &msg);
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if (err < 0) {
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goto close;
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} else if (msg.rx.ret < 0) {
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err = -EINVAL;
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goto close;
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}
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data += req.fwr.datalen;
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remaining -= req.fwr.datalen;
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}
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close:
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err = mrq_debug_close(bpmp, fd);
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out:
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mutex_unlock(&bpmp_debug_lock);
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return err;
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}
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static int bpmp_debug_show(struct seq_file *m, void *p)
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{
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struct file *file = m->private;
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struct inode *inode = file_inode(file);
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struct tegra_bpmp *bpmp = inode->i_private;
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char fnamebuf[256];
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const char *filename;
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struct mrq_debug_request req = {
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.cmd = CMD_DEBUG_READ,
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};
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struct mrq_debug_response resp;
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struct tegra_bpmp_message msg = {
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.mrq = MRQ_DEBUG,
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.tx = {
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.data = &req,
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.size = sizeof(req),
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},
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.rx = {
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.data = &resp,
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.size = sizeof(resp),
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},
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};
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u32 fd = 0, len = 0;
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int remaining, err;
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filename = get_filename(bpmp, file, fnamebuf, sizeof(fnamebuf));
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if (!filename)
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return -ENOENT;
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mutex_lock(&bpmp_debug_lock);
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err = mrq_debug_open(bpmp, filename, &fd, &len, 0);
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if (err)
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goto out;
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req.frd.fd = fd;
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remaining = len;
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while (remaining > 0) {
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err = tegra_bpmp_transfer(bpmp, &msg);
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if (err < 0) {
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goto close;
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} else if (msg.rx.ret < 0) {
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err = -EINVAL;
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goto close;
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}
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if (resp.frd.readlen > remaining) {
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pr_err("%s: read data length invalid\n", __func__);
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err = -EINVAL;
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goto close;
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}
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seq_write(m, resp.frd.data, resp.frd.readlen);
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remaining -= resp.frd.readlen;
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}
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close:
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err = mrq_debug_close(bpmp, fd);
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out:
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mutex_unlock(&bpmp_debug_lock);
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return err;
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}
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static ssize_t bpmp_debug_store(struct file *file, const char __user *buf,
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size_t count, loff_t *f_pos)
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{
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struct inode *inode = file_inode(file);
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struct tegra_bpmp *bpmp = inode->i_private;
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char *databuf = NULL;
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char fnamebuf[256];
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const char *filename;
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ssize_t err;
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filename = get_filename(bpmp, file, fnamebuf, sizeof(fnamebuf));
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if (!filename)
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return -ENOENT;
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databuf = memdup_user(buf, count);
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if (IS_ERR(databuf))
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return PTR_ERR(databuf);
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err = mrq_debug_write(bpmp, filename, databuf, count);
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kfree(databuf);
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return err ?: count;
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}
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static int bpmp_debug_open(struct inode *inode, struct file *file)
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{
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return single_open_size(file, bpmp_debug_show, file, SZ_256K);
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}
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static const struct file_operations bpmp_debug_fops = {
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.open = bpmp_debug_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.write = bpmp_debug_store,
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.release = single_release,
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};
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static int bpmp_populate_debugfs_inband(struct tegra_bpmp *bpmp,
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struct dentry *parent,
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char *ppath)
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{
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const size_t pathlen = SZ_256;
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const size_t bufsize = SZ_16K;
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struct dentry *dentry;
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u32 dsize, attrs = 0;
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struct seqbuf seqbuf;
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char *buf, *pathbuf;
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const char *name;
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int err = 0;
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if (!bpmp || !parent || !ppath)
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return -EINVAL;
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buf = kmalloc(bufsize, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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pathbuf = kzalloc(pathlen, GFP_KERNEL);
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if (!pathbuf) {
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kfree(buf);
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return -ENOMEM;
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}
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err = mrq_debug_read(bpmp, ppath, buf, bufsize, &dsize);
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if (err)
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goto out;
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seqbuf_init(&seqbuf, buf, dsize);
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while (!seqbuf_eof(&seqbuf)) {
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err = seqbuf_read_u32(&seqbuf, &attrs);
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if (err)
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goto out;
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err = seqbuf_read_str(&seqbuf, &name);
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if (err < 0)
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goto out;
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if (attrs & DEBUGFS_S_ISDIR) {
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size_t len;
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dentry = debugfs_create_dir(name, parent);
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if (IS_ERR(dentry)) {
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err = PTR_ERR(dentry);
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goto out;
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}
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len = snprintf(pathbuf, pathlen, "%s%s/", ppath, name);
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if (len >= pathlen) {
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err = -EINVAL;
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goto out;
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}
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err = bpmp_populate_debugfs_inband(bpmp, dentry,
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pathbuf);
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if (err < 0)
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goto out;
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} else {
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umode_t mode;
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mode = attrs & DEBUGFS_S_IRUSR ? 0400 : 0;
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mode |= attrs & DEBUGFS_S_IWUSR ? 0200 : 0;
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dentry = debugfs_create_file(name, mode, parent, bpmp,
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&bpmp_debug_fops);
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if (IS_ERR(dentry)) {
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err = -ENOMEM;
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goto out;
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}
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}
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}
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out:
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kfree(pathbuf);
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kfree(buf);
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return err;
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}
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static int mrq_debugfs_read(struct tegra_bpmp *bpmp,
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dma_addr_t name, size_t sz_name,
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dma_addr_t data, size_t sz_data,
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size_t *nbytes)
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{
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struct mrq_debugfs_request req = {
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.cmd = CMD_DEBUGFS_READ,
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.fop = {
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.fnameaddr = (u32)name,
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.fnamelen = (u32)sz_name,
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.dataaddr = (u32)data,
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.datalen = (u32)sz_data,
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},
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};
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struct mrq_debugfs_response resp;
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struct tegra_bpmp_message msg = {
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.mrq = MRQ_DEBUGFS,
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.tx = {
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.data = &req,
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.size = sizeof(req),
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},
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.rx = {
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.data = &resp,
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.size = sizeof(resp),
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},
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};
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int err;
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err = tegra_bpmp_transfer(bpmp, &msg);
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if (err < 0)
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return err;
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else if (msg.rx.ret < 0)
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return -EINVAL;
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*nbytes = (size_t)resp.fop.nbytes;
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return 0;
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}
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static int mrq_debugfs_write(struct tegra_bpmp *bpmp,
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dma_addr_t name, size_t sz_name,
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dma_addr_t data, size_t sz_data)
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{
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const struct mrq_debugfs_request req = {
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.cmd = CMD_DEBUGFS_WRITE,
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.fop = {
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.fnameaddr = (u32)name,
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.fnamelen = (u32)sz_name,
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.dataaddr = (u32)data,
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.datalen = (u32)sz_data,
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},
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};
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struct tegra_bpmp_message msg = {
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.mrq = MRQ_DEBUGFS,
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.tx = {
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.data = &req,
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.size = sizeof(req),
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},
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};
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return tegra_bpmp_transfer(bpmp, &msg);
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}
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static int mrq_debugfs_dumpdir(struct tegra_bpmp *bpmp, dma_addr_t addr,
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size_t size, size_t *nbytes)
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{
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const struct mrq_debugfs_request req = {
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.cmd = CMD_DEBUGFS_DUMPDIR,
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.dumpdir = {
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.dataaddr = (u32)addr,
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.datalen = (u32)size,
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},
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};
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struct mrq_debugfs_response resp;
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struct tegra_bpmp_message msg = {
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.mrq = MRQ_DEBUGFS,
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.tx = {
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.data = &req,
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.size = sizeof(req),
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},
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.rx = {
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.data = &resp,
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.size = sizeof(resp),
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},
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};
|
|
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;
|
|
}
|