409 lines
8.7 KiB
C
409 lines
8.7 KiB
C
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// 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/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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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, uint32_t *v)
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{
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int err;
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err = seqbuf_read(seqbuf, v, 4);
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*v = le32_to_cpu(*v);
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return err;
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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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char root_path_buf[512];
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const char *root_path;
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const char *filename;
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size_t root_len;
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root_path = dentry_path(bpmp->debugfs_mirror, root_path_buf,
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sizeof(root_path_buf));
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if (IS_ERR(root_path))
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return NULL;
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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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return NULL;
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if (strlen(filename) < root_len ||
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strncmp(filename, root_path, root_len))
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return NULL;
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filename += root_len;
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return filename;
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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 = cpu_to_le32(CMD_DEBUGFS_READ),
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.fop = {
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.fnameaddr = cpu_to_le32((uint32_t)name),
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.fnamelen = cpu_to_le32((uint32_t)sz_name),
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.dataaddr = cpu_to_le32((uint32_t)data),
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.datalen = cpu_to_le32((uint32_t)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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*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 = cpu_to_le32(CMD_DEBUGFS_WRITE),
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.fop = {
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.fnameaddr = cpu_to_le32((uint32_t)name),
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.fnamelen = cpu_to_le32((uint32_t)sz_name),
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.dataaddr = cpu_to_le32((uint32_t)data),
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.datalen = cpu_to_le32((uint32_t)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 = cpu_to_le32(CMD_DEBUGFS_DUMPDIR),
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.dumpdir = {
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.dataaddr = cpu_to_le32((uint32_t)addr),
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.datalen = cpu_to_le32((uint32_t)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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};
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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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*nbytes = (size_t)resp.dumpdir.nbytes;
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return 0;
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}
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static int debugfs_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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const size_t datasize = m->size;
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const size_t namesize = SZ_256;
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void *datavirt, *namevirt;
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dma_addr_t dataphys, namephys;
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char buf[256];
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const char *filename;
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size_t len, nbytes;
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int ret;
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filename = get_filename(bpmp, file, buf, sizeof(buf));
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if (!filename)
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return -ENOENT;
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namevirt = dma_alloc_coherent(bpmp->dev, namesize, &namephys,
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GFP_KERNEL | GFP_DMA32);
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if (!namevirt)
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return -ENOMEM;
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datavirt = dma_alloc_coherent(bpmp->dev, datasize, &dataphys,
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GFP_KERNEL | GFP_DMA32);
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if (!datavirt) {
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ret = -ENOMEM;
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goto free_namebuf;
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}
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len = strlen(filename);
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strncpy(namevirt, filename, namesize);
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ret = mrq_debugfs_read(bpmp, namephys, len, dataphys, datasize,
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&nbytes);
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if (!ret)
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seq_write(m, datavirt, nbytes);
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dma_free_coherent(bpmp->dev, datasize, datavirt, dataphys);
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free_namebuf:
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dma_free_coherent(bpmp->dev, namesize, namevirt, namephys);
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return ret;
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}
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static int debugfs_open(struct inode *inode, struct file *file)
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{
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return single_open_size(file, debugfs_show, file, SZ_128K);
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}
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static ssize_t debugfs_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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const size_t datasize = count;
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const size_t namesize = SZ_256;
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void *datavirt, *namevirt;
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dma_addr_t dataphys, namephys;
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char fnamebuf[256];
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const char *filename;
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size_t len;
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int ret;
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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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namevirt = dma_alloc_coherent(bpmp->dev, namesize, &namephys,
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GFP_KERNEL | GFP_DMA32);
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if (!namevirt)
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return -ENOMEM;
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datavirt = dma_alloc_coherent(bpmp->dev, datasize, &dataphys,
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GFP_KERNEL | GFP_DMA32);
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if (!datavirt) {
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ret = -ENOMEM;
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goto free_namebuf;
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}
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len = strlen(filename);
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strncpy(namevirt, filename, namesize);
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if (copy_from_user(datavirt, buf, count)) {
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ret = -EFAULT;
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goto free_databuf;
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}
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ret = mrq_debugfs_write(bpmp, namephys, len, dataphys,
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count);
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free_databuf:
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dma_free_coherent(bpmp->dev, datasize, datavirt, dataphys);
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free_namebuf:
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dma_free_coherent(bpmp->dev, namesize, namevirt, namephys);
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return ret ?: count;
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}
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static const struct file_operations debugfs_fops = {
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.open = debugfs_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.write = debugfs_store,
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.release = single_release,
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};
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static int bpmp_populate_dir(struct tegra_bpmp *bpmp, struct seqbuf *seqbuf,
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struct dentry *parent, uint32_t depth)
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{
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int err;
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uint32_t d, t;
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const char *name;
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struct dentry *dentry;
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while (!seqbuf_eof(seqbuf)) {
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err = seqbuf_read_u32(seqbuf, &d);
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if (err < 0)
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return err;
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if (d < depth) {
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seqbuf_seek(seqbuf, -4);
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/* go up a level */
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return 0;
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} else if (d != depth) {
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/* malformed data received from BPMP */
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return -EIO;
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}
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err = seqbuf_read_u32(seqbuf, &t);
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if (err < 0)
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return err;
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err = seqbuf_read_str(seqbuf, &name);
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if (err < 0)
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return err;
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if (t & DEBUGFS_S_ISDIR) {
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dentry = debugfs_create_dir(name, parent);
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if (!dentry)
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return -ENOMEM;
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err = bpmp_populate_dir(bpmp, seqbuf, dentry, depth+1);
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if (err < 0)
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return err;
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} else {
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umode_t mode;
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mode = t & DEBUGFS_S_IRUSR ? S_IRUSR : 0;
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mode |= t & DEBUGFS_S_IWUSR ? S_IWUSR : 0;
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dentry = debugfs_create_file(name, mode,
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parent, bpmp,
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&debugfs_fops);
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if (!dentry)
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return -ENOMEM;
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}
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}
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return 0;
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}
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static int create_debugfs_mirror(struct tegra_bpmp *bpmp, void *buf,
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size_t bufsize, struct dentry *root)
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{
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struct seqbuf seqbuf;
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int err;
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bpmp->debugfs_mirror = debugfs_create_dir("debug", root);
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if (!bpmp->debugfs_mirror)
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return -ENOMEM;
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seqbuf_init(&seqbuf, buf, bufsize);
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err = bpmp_populate_dir(bpmp, &seqbuf, bpmp->debugfs_mirror, 0);
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if (err < 0) {
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debugfs_remove_recursive(bpmp->debugfs_mirror);
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bpmp->debugfs_mirror = NULL;
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}
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return err;
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}
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int tegra_bpmp_init_debugfs(struct tegra_bpmp *bpmp)
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{
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dma_addr_t phys;
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void *virt;
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const size_t sz = SZ_256K;
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size_t nbytes;
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int ret;
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struct dentry *root;
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if (!tegra_bpmp_mrq_is_supported(bpmp, MRQ_DEBUGFS))
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return 0;
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|
|
root = debugfs_create_dir("bpmp", NULL);
|
||
|
|
if (!root)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
virt = dma_alloc_coherent(bpmp->dev, sz, &phys,
|
||
|
|
GFP_KERNEL | GFP_DMA32);
|
||
|
|
if (!virt) {
|
||
|
|
ret = -ENOMEM;
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = mrq_debugfs_dumpdir(bpmp, phys, sz, &nbytes);
|
||
|
|
if (ret < 0)
|
||
|
|
goto free;
|
||
|
|
|
||
|
|
ret = create_debugfs_mirror(bpmp, virt, nbytes, root);
|
||
|
|
free:
|
||
|
|
dma_free_coherent(bpmp->dev, sz, virt, phys);
|
||
|
|
out:
|
||
|
|
if (ret < 0)
|
||
|
|
debugfs_remove(root);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|