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wil6210: add debugfs to show PMC ring content 

PMC is a hardware debug mechanism which allows capturing real time
debug data and stream it to host memory. The driver allocates memory
buffers and set them inside PMC ring of descriptors.
Add pmcring debugfs that application can use to read the binary
content of descriptors inside the PMC ring (cat pmcring).

Signed-off-by: Dedy Lansky <dlansky@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Dedy Lansky 2019-09-10 16:46:24 +03:00 committed by Kalle Valo
parent f99fe49ff3
commit 977c45ab5f
3 changed files with 40 additions and 0 deletions
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13
drivers/net/wireless/ath/wil6210/debugfs.c
View File

@ -959,6 +959,18 @@ static const struct file_operations fops_pmcdata = {
.llseek = wil_pmc_llseek,
};
static int wil_pmcring_seq_open(struct inode *inode, struct file *file)
{
return single_open(file, wil_pmcring_read, inode->i_private);
}
static const struct file_operations fops_pmcring = {
.open = wil_pmcring_seq_open,
.release = single_release,
.read = seq_read,
.llseek = seq_lseek,
};
/*---tx_mgmt---*/
/* Write mgmt frame to this file to send it */
static ssize_t wil_write_file_txmgmt(struct file *file, const char __user *buf,
@ -2371,6 +2383,7 @@ static const struct {
{"back", 0644, &fops_back},
{"pmccfg", 0644, &fops_pmccfg},
{"pmcdata", 0444, &fops_pmcdata},
{"pmcring", 0444, &fops_pmcring},
{"temp", 0444, &temp_fops},
{"freq", 0444, &freq_fops},
{"link", 0444, &link_fops},

26
drivers/net/wireless/ath/wil6210/pmc.c
View File

@ -18,6 +18,7 @@
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/seq_file.h>
#include "wmi.h"
#include "wil6210.h"
#include "txrx.h"
@ -431,3 +432,28 @@ loff_t wil_pmc_llseek(struct file *filp, loff_t off, int whence)
return newpos;
}
int wil_pmcring_read(struct seq_file *s, void *data)
{
struct wil6210_priv *wil = s->private;
struct pmc_ctx *pmc = &wil->pmc;
size_t pmc_ring_size =
sizeof(struct vring_rx_desc) * pmc->num_descriptors;
mutex_lock(&pmc->lock);
if (!wil_is_pmc_allocated(pmc)) {
wil_err(wil, "error, pmc is not allocated!\n");
pmc->last_cmd_status = -EPERM;
mutex_unlock(&pmc->lock);
return -EPERM;
}
wil_dbg_misc(wil, "pmcring_read: size %zu\n", pmc_ring_size);
seq_write(s, pmc->pring_va, pmc_ring_size);
mutex_unlock(&pmc->lock);
return 0;
}

1
drivers/net/wireless/ath/wil6210/pmc.h
View File

@ -25,3 +25,4 @@ void wil_pmc_free(struct wil6210_priv *wil, int send_pmc_cmd);
int wil_pmc_last_cmd_status(struct wil6210_priv *wil);
ssize_t wil_pmc_read(struct file *, char __user *, size_t, loff_t *);
loff_t wil_pmc_llseek(struct file *filp, loff_t off, int whence);
int wil_pmcring_read(struct seq_file *s, void *data);