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wil6210: prevent device memory access while in reset or suspend

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Accessing some of the memory of the device while the device is
resetting or suspending may cause unexpected error as the HW is still
not in a stable state. Prevent this access to guarantee successful
read/write memory operations.

Signed-off-by: Ahmad Masri <amasri@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Ahmad Masri 2019-02-28 11:34:44 +02:00 committed by Kalle Valo
parent 73a7d1e34d
commit a061894587
5 changed files with 80 additions and 38 deletions
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25
drivers/net/wireless/ath/wil6210/debugfs.c
View File

@ -258,6 +258,11 @@ static void wil_print_mbox_ring(struct seq_file *s, const char *prefix,
wil_halp_vote(wil);
if (wil_mem_access_lock(wil)) {
wil_halp_unvote(wil);
return;
}
wil_memcpy_fromio_32(&r, off, sizeof(r));
wil_mbox_ring_le2cpus(&r);
/*
@ -323,6 +328,7 @@ static void wil_print_mbox_ring(struct seq_file *s, const char *prefix,
}
out:
seq_puts(s, "}\n");
wil_mem_access_unlock(wil);
wil_halp_unvote(wil);
}
@ -601,6 +607,12 @@ static int memread_show(struct seq_file *s, void *data)
if (ret < 0)
return ret;
ret = wil_mem_access_lock(wil);
if (ret) {
wil_pm_runtime_put(wil);
return ret;
}
a = wmi_buffer(wil, cpu_to_le32(mem_addr));
if (a)
@ -608,6 +620,7 @@ static int memread_show(struct seq_file *s, void *data)
else
seq_printf(s, "[0x%08x] = INVALID\n", mem_addr);
wil_mem_access_unlock(wil);
wil_pm_runtime_put(wil);
return 0;
@ -626,10 +639,6 @@ static ssize_t wil_read_file_ioblob(struct file *file, char __user *user_buf,
size_t unaligned_bytes, aligned_count, ret;
int rc;
if (test_bit(wil_status_suspending, wil_blob->wil->status) ||
test_bit(wil_status_suspended, wil_blob->wil->status))
return 0;
if (pos < 0)
return -EINVAL;
@ -656,11 +665,19 @@ static ssize_t wil_read_file_ioblob(struct file *file, char __user *user_buf,
return rc;
}
rc = wil_mem_access_lock(wil);
if (rc) {
kfree(buf);
wil_pm_runtime_put(wil);
return rc;
}
wil_memcpy_fromio_32(buf, (const void __iomem *)
wil_blob->blob.data + aligned_pos, aligned_count);
ret = copy_to_user(user_buf, buf + unaligned_bytes, count);
wil_mem_access_unlock(wil);
wil_pm_runtime_put(wil);
kfree(buf);

41
drivers/net/wireless/ath/wil6210/main.c
View File

@ -184,6 +184,28 @@ void wil_memcpy_toio_32(volatile void __iomem *dst, const void *src,
}
}
/* Device memory access is prohibited while reset or suspend.
* wil_mem_access_lock protects accessing device memory in these cases
*/
int wil_mem_access_lock(struct wil6210_priv *wil)
{
if (!down_read_trylock(&wil->mem_lock))
return -EBUSY;
if (test_bit(wil_status_suspending, wil->status) ||
test_bit(wil_status_suspended, wil->status)) {
up_read(&wil->mem_lock);
return -EBUSY;
}
return 0;
}
void wil_mem_access_unlock(struct wil6210_priv *wil)
{
up_read(&wil->mem_lock);
}
static void wil_ring_fini_tx(struct wil6210_priv *wil, int id)
{
struct wil_ring *ring = &wil->ring_tx[id];
@ -703,6 +725,7 @@ int wil_priv_init(struct wil6210_priv *wil)
spin_lock_init(&wil->wmi_ev_lock);
spin_lock_init(&wil->net_queue_lock);
init_waitqueue_head(&wil->wq);
init_rwsem(&wil->mem_lock);
wil->wmi_wq = create_singlethread_workqueue(WIL_NAME "_wmi");
if (!wil->wmi_wq)
@ -1599,15 +1622,6 @@ int wil_reset(struct wil6210_priv *wil, bool load_fw)
}
set_bit(wil_status_resetting, wil->status);
if (test_bit(wil_status_collecting_dumps, wil->status)) {
/* Device collects crash dump, cancel the reset.
* following crash dump collection, reset would take place.
*/
wil_dbg_misc(wil, "reject reset while collecting crash dump\n");
rc = -EBUSY;
goto out;
}
mutex_lock(&wil->vif_mutex);
wil_abort_scan_all_vifs(wil, false);
mutex_unlock(&wil->vif_mutex);
@ -1782,7 +1796,9 @@ int __wil_up(struct wil6210_priv *wil)
WARN_ON(!mutex_is_locked(&wil->mutex));
down_write(&wil->mem_lock);
rc = wil_reset(wil, true);
up_write(&wil->mem_lock);
if (rc)
return rc;
@ -1854,6 +1870,7 @@ int wil_up(struct wil6210_priv *wil)
int __wil_down(struct wil6210_priv *wil)
{
int rc;
WARN_ON(!mutex_is_locked(&wil->mutex));
set_bit(wil_status_resetting, wil->status);
@ -1873,7 +1890,11 @@ int __wil_down(struct wil6210_priv *wil)
wil_abort_scan_all_vifs(wil, false);
mutex_unlock(&wil->vif_mutex);
return wil_reset(wil, false);
down_write(&wil->mem_lock);
rc = wil_reset(wil, false);
up_write(&wil->mem_lock);
return rc;
}
int wil_down(struct wil6210_priv *wil)

29
drivers/net/wireless/ath/wil6210/pm.c
View File

@ -1,6 +1,6 @@
/*
* Copyright (c) 2014,2017 Qualcomm Atheros, Inc.
* Copyright (c) 2018, The Linux Foundation. All rights reserved.
* Copyright (c) 2018-2019, The Linux Foundation. All rights reserved.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
@ -195,14 +195,18 @@ static int wil_suspend_keep_radio_on(struct wil6210_priv *wil)
wil_dbg_pm(wil, "suspend keep radio on\n");
/* Prevent handling of new tx and wmi commands */
set_bit(wil_status_suspending, wil->status);
if (test_bit(wil_status_collecting_dumps, wil->status)) {
/* Device collects crash dump, cancel the suspend */
wil_dbg_pm(wil, "reject suspend while collecting crash dump\n");
clear_bit(wil_status_suspending, wil->status);
rc = down_write_trylock(&wil->mem_lock);
if (!rc) {
wil_err(wil,
"device is busy. down_write_trylock failed, returned (0x%x)\n",
rc);
wil->suspend_stats.rejected_by_host++;
return -EBUSY;
}
set_bit(wil_status_suspending, wil->status);
up_write(&wil->mem_lock);
wil_pm_stop_all_net_queues(wil);
if (!wil_is_tx_idle(wil)) {
@ -310,15 +314,18 @@ static int wil_suspend_radio_off(struct wil6210_priv *wil)
wil_dbg_pm(wil, "suspend radio off\n");
set_bit(wil_status_suspending, wil->status);
if (test_bit(wil_status_collecting_dumps, wil->status)) {
/* Device collects crash dump, cancel the suspend */
wil_dbg_pm(wil, "reject suspend while collecting crash dump\n");
clear_bit(wil_status_suspending, wil->status);
rc = down_write_trylock(&wil->mem_lock);
if (!rc) {
wil_err(wil,
"device is busy. down_write_trylock failed, returned (0x%x)\n",
rc);
wil->suspend_stats.rejected_by_host++;
return -EBUSY;
}
set_bit(wil_status_suspending, wil->status);
up_write(&wil->mem_lock);
/* if netif up, hardware is alive, shut it down */
mutex_lock(&wil->vif_mutex);
active_ifaces = wil_has_active_ifaces(wil, true, false);

5
drivers/net/wireless/ath/wil6210/wil6210.h
View File

@ -660,7 +660,6 @@ enum { /* for wil6210_priv.status */
wil_status_suspending, /* suspend in progress */
wil_status_suspended, /* suspend completed, device is suspended */
wil_status_resuming, /* resume in progress */
wil_status_collecting_dumps, /* crashdump collection in progress */
wil_status_last /* keep last */
};
@ -992,6 +991,8 @@ struct wil6210_priv {
struct wil_txrx_ops txrx_ops;
struct mutex mutex; /* for wil6210_priv access in wil_{up|down} */
/* for synchronizing device memory access while reset or suspend */
struct rw_semaphore mem_lock;
/* statistics */
atomic_t isr_count_rx, isr_count_tx;
/* debugfs */
@ -1176,6 +1177,8 @@ void wil_memcpy_fromio_32(void *dst, const volatile void __iomem *src,
size_t count);
void wil_memcpy_toio_32(volatile void __iomem *dst, const void *src,
size_t count);
int wil_mem_access_lock(struct wil6210_priv *wil);
void wil_mem_access_unlock(struct wil6210_priv *wil);
struct wil6210_vif *
wil_vif_alloc(struct wil6210_priv *wil, const char *name,

18
drivers/net/wireless/ath/wil6210/wil_crash_dump.c
View File

@ -1,6 +1,6 @@
/*
* Copyright (c) 2015,2017 Qualcomm Atheros, Inc.
* Copyright (c) 2018, The Linux Foundation. All rights reserved.
* Copyright (c) 2018-2019, The Linux Foundation. All rights reserved.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
@ -57,7 +57,7 @@ static int wil_fw_get_crash_dump_bounds(struct wil6210_priv *wil,
int wil_fw_copy_crash_dump(struct wil6210_priv *wil, void *dest, u32 size)
{
int i;
int i, rc;
const struct fw_map *map;
void *data;
u32 host_min, dump_size, offset, len;
@ -73,14 +73,9 @@ int wil_fw_copy_crash_dump(struct wil6210_priv *wil, void *dest, u32 size)
return -EINVAL;
}
set_bit(wil_status_collecting_dumps, wil->status);
if (test_bit(wil_status_suspending, wil->status) ||
test_bit(wil_status_suspended, wil->status) ||
test_bit(wil_status_resetting, wil->status)) {
wil_err(wil, "cannot collect fw dump during suspend/reset\n");
clear_bit(wil_status_collecting_dumps, wil->status);
return -EINVAL;
}
rc = wil_mem_access_lock(wil);
if (rc)
return rc;
/* copy to crash dump area */
for (i = 0; i < ARRAY_SIZE(fw_mapping); i++) {
@ -100,8 +95,7 @@ int wil_fw_copy_crash_dump(struct wil6210_priv *wil, void *dest, u32 size)
wil_memcpy_fromio_32((void * __force)(dest + offset),
(const void __iomem * __force)data, len);
}
clear_bit(wil_status_collecting_dumps, wil->status);
wil_mem_access_unlock(wil);
return 0;
}