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firmware: tegra: Add support for in-band debug
Add support for retrieving BPMP debug information via in-band messaging as opposed to using shared-memory which older BPMP firmware used. Note that it is possible to detect at runtime whether the BPMP firmware being used supports the in-band messaging for retrieving the debug informaation. Therefore, if the BPMP firmware supports the in-band messaging for debug use this and otherwise fall-back to using shared memory. Signed-off-by: Jon Hunter <jonathanh@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Jon Hunter
Thierry Reding
parent
cc8d0a4538
commit
5e37b9c137
@ -4,11 +4,14 @@
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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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@ -96,6 +99,354 @@ static const char *get_filename(struct tegra_bpmp *bpmp,
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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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uint32_t *fd, uint32_t *len, bool write)
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{
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struct mrq_debug_request req = {
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.cmd = cpu_to_le32(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, uint32_t fd)
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{
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struct mrq_debug_request req = {
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.cmd = cpu_to_le32(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, uint32_t *nbytes)
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{
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struct mrq_debug_request req = {
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.cmd = cpu_to_le32(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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uint32_t 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 = cpu_to_le32(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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uint32_t 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 *databuf = NULL;
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char fnamebuf[256];
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const char *filename;
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uint32_t nbytes = 0;
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size_t len;
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int err;
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len = seq_get_buf(m, &databuf);
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if (!databuf)
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return -ENOMEM;
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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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err = mrq_debug_read(bpmp, filename, databuf, len, &nbytes);
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if (!err)
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seq_commit(m, nbytes);
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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 = kmalloc(count, GFP_KERNEL);
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if (!databuf)
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return -ENOMEM;
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if (copy_from_user(databuf, buf, count)) {
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err = -EFAULT;
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goto free_ret;
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}
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err = mrq_debug_write(bpmp, filename, databuf, count);
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free_ret:
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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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uint32_t dsize, attrs = 0;
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struct dentry *dentry;
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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 = strlen(ppath) + strlen(name) + 1;
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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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strncpy(pathbuf, ppath, pathlen);
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strncat(pathbuf, name, strlen(name));
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strcat(pathbuf, "/");
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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 (!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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@ -354,8 +705,7 @@ static int bpmp_populate_dir(struct tegra_bpmp *bpmp, struct seqbuf *seqbuf,
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return 0;
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}
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static int bpmp_populate_debugfs_shmem(struct tegra_bpmp *bpmp,
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struct dentry *root)
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static int bpmp_populate_debugfs_shmem(struct tegra_bpmp *bpmp)
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{
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struct seqbuf seqbuf;
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const size_t sz = SZ_512K;
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@ -364,10 +714,6 @@ static int bpmp_populate_debugfs_shmem(struct tegra_bpmp *bpmp,
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void *virt;
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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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virt = dma_alloc_coherent(bpmp->dev, sz, &phys,
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GFP_KERNEL | GFP_DMA32);
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if (!virt)
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@ -392,16 +738,31 @@ free:
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int tegra_bpmp_init_debugfs(struct tegra_bpmp *bpmp)
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{
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struct dentry *root;
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bool inband;
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int err;
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if (!tegra_bpmp_mrq_is_supported(bpmp, MRQ_DEBUGFS))
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inband = tegra_bpmp_mrq_is_supported(bpmp, MRQ_DEBUG);
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if (!inband && !tegra_bpmp_mrq_is_supported(bpmp, MRQ_DEBUGFS))
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return 0;
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root = debugfs_create_dir("bpmp", NULL);
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if (!root)
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return -ENOMEM;
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err = bpmp_populate_debugfs_shmem(bpmp, root);
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bpmp->debugfs_mirror = debugfs_create_dir("debug", root);
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if (!bpmp->debugfs_mirror) {
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err = -ENOMEM;
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goto out;
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}
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if (inband)
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err = bpmp_populate_debugfs_inband(bpmp, bpmp->debugfs_mirror,
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"/");
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else
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err = bpmp_populate_debugfs_shmem(bpmp);
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out:
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if (err < 0)
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debugfs_remove_recursive(root);
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@ -148,6 +148,7 @@ struct mrq_response {
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#define MRQ_FMON 72
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#define MRQ_EC 73
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#define MRQ_FBVOLT_STATUS 74
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#define MRQ_DEBUG 75
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/** @} */
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@ -156,7 +157,7 @@ struct mrq_response {
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* @brief Maximum MRQ code to be sent by CPU software to
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* BPMP. Subject to change in future
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*/
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#define MAX_CPU_MRQ_ID 74
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#define MAX_CPU_MRQ_ID 75
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/**
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* @addtogroup MRQ_Payloads
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@ -532,6 +533,8 @@ struct mrq_module_mail_response {
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* @def MRQ_DEBUGFS
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* @brief Interact with BPMP's debugfs file nodes
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*
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* @deprecated use MRQ_DEBUG instead.
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*
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* * Platforms: T186, T194
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* * Initiators: Any
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* * Targets: BPMP
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@ -671,6 +674,190 @@ struct mrq_debugfs_response {
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#define DEBUGFS_S_IWUSR (1 << 7)
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/** @} */
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/**
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* @ingroup MRQ_Codes
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* @def MRQ_DEBUG
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* @brief Interact with BPMP's debugfs file nodes. Use message payload
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* for exchanging data. This is functionally equivalent to
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* @ref MRQ_DEBUGFS. But the way in which data is exchanged is different.
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* When software running on CPU tries to read a debugfs file,
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* the file path and read data will be stored in message payload.
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* Since the message payload size is limited, a debugfs file
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* transaction might require multiple frames of data exchanged
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* between BPMP and CPU until the transaction completes.
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*
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* * Platforms: T194
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* * Initiators: Any
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* * Targets: BPMP
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* * Request Payload: @ref mrq_debug_request
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* * Response Payload: @ref mrq_debug_response
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*/
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|
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/** @ingroup Debugfs */
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enum mrq_debug_commands {
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/** @brief Open required file for read operation */
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CMD_DEBUG_OPEN_RO = 0,
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/** @brief Open required file for write operation */
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CMD_DEBUG_OPEN_WO = 1,
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/** @brief Perform read */
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CMD_DEBUG_READ = 2,
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/** @brief Perform write */
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CMD_DEBUG_WRITE = 3,
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/** @brief Close file */
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CMD_DEBUG_CLOSE = 4,
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/** @brief Not a command */
|
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CMD_DEBUG_MAX
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};
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|
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/**
|
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* @ingroup Debugfs
|
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* @brief Maximum number of files that can be open at a given time
|
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*/
|
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#define DEBUG_MAX_OPEN_FILES 1
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|
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/**
|
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* @ingroup Debugfs
|
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* @brief Maximum size of null-terminated file name string in bytes.
|
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* Value is derived from memory available in message payload while
|
||||
* using @ref cmd_debug_fopen_request
|
||||
* Value 4 corresponds to size of @ref mrq_debug_commands
|
||||
* in @ref mrq_debug_request.
|
||||
* 120 - 4 dbg_cmd(32bit) = 116
|
||||
*/
|
||||
#define DEBUG_FNAME_MAX_SZ (MSG_DATA_MIN_SZ - 4)
|
||||
|
||||
/**
|
||||
* @ingroup Debugfs
|
||||
* @brief Parameters for CMD_DEBUG_OPEN command
|
||||
*/
|
||||
struct cmd_debug_fopen_request {
|
||||
/** @brief File name - Null-terminated string with maximum
|
||||
* length @ref DEBUG_FNAME_MAX_SZ
|
||||
*/
|
||||
char name[DEBUG_FNAME_MAX_SZ];
|
||||
} __ABI_PACKED;
|
||||
|
||||
/**
|
||||
* @ingroup Debugfs
|
||||
* @brief Response data for CMD_DEBUG_OPEN_RO/WO command
|
||||
*/
|
||||
struct cmd_debug_fopen_response {
|
||||
/** @brief Identifier for file access */
|
||||
uint32_t fd;
|
||||
/** @brief Data length. File data size for READ command.
|
||||
* Maximum allowed length for WRITE command
|
||||
*/
|
||||
uint32_t datalen;
|
||||
} __ABI_PACKED;
|
||||
|
||||
/**
|
||||
* @ingroup Debugfs
|
||||
* @brief Parameters for CMD_DEBUG_READ command
|
||||
*/
|
||||
struct cmd_debug_fread_request {
|
||||
/** @brief File access identifier received in response
|
||||
* to CMD_DEBUG_OPEN_RO request
|
||||
*/
|
||||
uint32_t fd;
|
||||
} __ABI_PACKED;
|
||||
|
||||
/**
|
||||
* @ingroup Debugfs
|
||||
* @brief Maximum size of read data in bytes.
|
||||
* Value is derived from memory available in message payload while
|
||||
* using @ref cmd_debug_fread_response.
|
||||
*/
|
||||
#define DEBUG_READ_MAX_SZ (MSG_DATA_MIN_SZ - 4)
|
||||
|
||||
/**
|
||||
* @ingroup Debugfs
|
||||
* @brief Response data for CMD_DEBUG_READ command
|
||||
*/
|
||||
struct cmd_debug_fread_response {
|
||||
/** @brief Size of data provided in this response in bytes */
|
||||
uint32_t readlen;
|
||||
/** @brief File data from seek position */
|
||||
char data[DEBUG_READ_MAX_SZ];
|
||||
} __ABI_PACKED;
|
||||
|
||||
/**
|
||||
* @ingroup Debugfs
|
||||
* @brief Maximum size of write data in bytes.
|
||||
* Value is derived from memory available in message payload while
|
||||
* using @ref cmd_debug_fwrite_request.
|
||||
*/
|
||||
#define DEBUG_WRITE_MAX_SZ (MSG_DATA_MIN_SZ - 12)
|
||||
|
||||
/**
|
||||
* @ingroup Debugfs
|
||||
* @brief Parameters for CMD_DEBUG_WRITE command
|
||||
*/
|
||||
struct cmd_debug_fwrite_request {
|
||||
/** @brief File access identifier received in response
|
||||
* to CMD_DEBUG_OPEN_RO request
|
||||
*/
|
||||
uint32_t fd;
|
||||
/** @brief Size of write data in bytes */
|
||||
uint32_t datalen;
|
||||
/** @brief Data to be written */
|
||||
char data[DEBUG_WRITE_MAX_SZ];
|
||||
} __ABI_PACKED;
|
||||
|
||||
/**
|
||||
* @ingroup Debugfs
|
||||
* @brief Parameters for CMD_DEBUG_CLOSE command
|
||||
*/
|
||||
struct cmd_debug_fclose_request {
|
||||
/** @brief File access identifier received in response
|
||||
* to CMD_DEBUG_OPEN_RO request
|
||||
*/
|
||||
uint32_t fd;
|
||||
} __ABI_PACKED;
|
||||
|
||||
/**
|
||||
* @ingroup Debugfs
|
||||
* @brief Request with #MRQ_DEBUG.
|
||||
*
|
||||
* The sender of an MRQ_DEBUG message uses #cmd to specify a debugfs
|
||||
* command to execute. Legal commands are the values of @ref
|
||||
* mrq_debug_commands. Each command requires a specific additional
|
||||
* payload of data.
|
||||
*
|
||||
* |command |payload|
|
||||
* |-------------------|-------|
|
||||
* |CMD_DEBUG_OPEN_RO |fop |
|
||||
* |CMD_DEBUG_OPEN_WO |fop |
|
||||
* |CMD_DEBUG_READ |frd |
|
||||
* |CMD_DEBUG_WRITE |fwr |
|
||||
* |CMD_DEBUG_CLOSE |fcl |
|
||||
*/
|
||||
struct mrq_debug_request {
|
||||
/** @brief Sub-command (@ref mrq_debug_commands) */
|
||||
uint32_t cmd;
|
||||
union {
|
||||
/** @brief Request payload for CMD_DEBUG_OPEN_RO/WO command */
|
||||
struct cmd_debug_fopen_request fop;
|
||||
/** @brief Request payload for CMD_DEBUG_READ command */
|
||||
struct cmd_debug_fread_request frd;
|
||||
/** @brief Request payload for CMD_DEBUG_WRITE command */
|
||||
struct cmd_debug_fwrite_request fwr;
|
||||
/** @brief Request payload for CMD_DEBUG_CLOSE command */
|
||||
struct cmd_debug_fclose_request fcl;
|
||||
} __UNION_ANON;
|
||||
} __ABI_PACKED;
|
||||
|
||||
/**
|
||||
* @ingroup Debugfs
|
||||
*/
|
||||
struct mrq_debug_response {
|
||||
union {
|
||||
/** @brief Response data for CMD_DEBUG_OPEN_RO/WO command */
|
||||
struct cmd_debug_fopen_response fop;
|
||||
/** @brief Response data for CMD_DEBUG_READ command */
|
||||
struct cmd_debug_fread_response frd;
|
||||
} __UNION_ANON;
|
||||
} __ABI_PACKED;
|
||||
|
||||
/**
|
||||
* @ingroup MRQ_Codes
|
||||
* @def MRQ_RESET
|
||||
|
||||
Loading…
Reference in New Issue
Block a user