netdev - [PATCH v3 5/8] ath10k: use new taint_firmware

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Date:   Tue, 26 May 2020 14:58:12 +0000
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     jeyu@...nel.org, davem@...emloft.net, kuba@...nel.org
Cc:     michael.chan@...adcom.com, dchickles@...vell.com,
        sburla@...vell.com, fmanlunas@...vell.com, aelior@...vell.com,
        GR-everest-linux-l2@...vell.com, kvalo@...eaurora.org,
        johannes@...solutions.net, akpm@...ux-foundation.org,
        arnd@...db.de, rostedt@...dmis.org, mingo@...hat.com,
        aquini@...hat.com, cai@....pw, dyoung@...hat.com, bhe@...hat.com,
        peterz@...radead.org, tglx@...utronix.de, gpiccoli@...onical.com,
        pmladek@...e.com, tiwai@...e.de, schlad@...e.de,
        andriy.shevchenko@...ux.intel.com, derosier@...il.com,
        keescook@...omium.org, daniel.vetter@...ll.ch, will@...nel.org,
        mchehab+samsung@...nel.org, vkoul@...nel.org,
        mchehab+huawei@...nel.org, robh@...nel.org, mhiramat@...nel.org,
        sfr@...b.auug.org.au, linux@...inikbrodowski.net,
        glider@...gle.com, paulmck@...nel.org, elver@...gle.com,
        bauerman@...ux.ibm.com, yamada.masahiro@...ionext.com,
        samitolvanen@...gle.com, yzaikin@...gle.com, dvyukov@...gle.com,
        rdunlap@...radead.org, corbet@....net, dianders@...omium.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, Luis Chamberlain <mcgrof@...nel.org>,
        linux-wireless@...r.kernel.org, ath10k@...ts.infradead.org
Subject: [PATCH v3 5/8] ath10k: use new taint_firmware_crashed()

This makes use of the new taint_firmware_crashed() to help
annotate when firmware for device drivers crash. When firmware
crashes devices can sometimes become unresponsive, and recovery
sometimes requires a driver unload / reload and in the worst cases
a reboot.

Using a taint flag allows us to annotate when this happens clearly.

I have run into this situation with this driver with the latest
firmware as of today, May 21, 2020 using v5.6.0, leaving me at
a state at which my only option is to reboot. Driver removal and
addition does not fix the situation. This is reported on kernel.org
bugzilla korg#207851 [0]. But this isn't the first firmware crash reported,
others have been filed before and none of these bugs have yet been
addressed [1] [2] [3].  Including my own I see these firmware crash
reports:

  * korg#207851 [0]
  * korg#197013 [1]
  * korg#201237 [2]
  * korg#195987 [3]

[0] https://bugzilla.kernel.org/show_bug.cgi?id=207851
[1] https://bugzilla.kernel.org/show_bug.cgi?id=197013
[2] https://bugzilla.kernel.org/show_bug.cgi?id=201237
[3] https://bugzilla.kernel.org/show_bug.cgi?id=195987

Cc: linux-wireless@...r.kernel.org
Cc: ath10k@...ts.infradead.org
Cc: Kalle Valo <kvalo@...eaurora.org>
Acked-by: Rafael Aquini <aquini@...hat.com>
Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
---
 drivers/net/wireless/ath/ath10k/pci.c  | 2 ++
 drivers/net/wireless/ath/ath10k/sdio.c | 2 ++
 drivers/net/wireless/ath/ath10k/snoc.c | 1 +
 3 files changed, 5 insertions(+)

diff --git a/drivers/net/wireless/ath/ath10k/pci.c b/drivers/net/wireless/ath/ath10k/pci.c
index 1d941d53fdc9..818c3acc2468 100644
--- a/drivers/net/wireless/ath/ath10k/pci.c
+++ b/drivers/net/wireless/ath/ath10k/pci.c
@@ -1767,6 +1767,7 @@ static void ath10k_pci_fw_dump_work(struct work_struct *work)
 		scnprintf(guid, sizeof(guid), "n/a");
 
 	ath10k_err(ar, "firmware crashed! (guid %s)\n", guid);
+	taint_firmware_crashed();
 	ath10k_print_driver_info(ar);
 	ath10k_pci_dump_registers(ar, crash_data);
 	ath10k_ce_dump_registers(ar, crash_data);
@@ -2837,6 +2838,7 @@ static int ath10k_pci_hif_power_up(struct ath10k *ar,
 	if (ret) {
 		if (ath10k_pci_has_fw_crashed(ar)) {
 			ath10k_warn(ar, "firmware crashed during chip reset\n");
+			taint_firmware_crashed();
 			ath10k_pci_fw_crashed_clear(ar);
 			ath10k_pci_fw_crashed_dump(ar);
 		}
diff --git a/drivers/net/wireless/ath/ath10k/sdio.c b/drivers/net/wireless/ath/ath10k/sdio.c
index e2aff2254a40..8b2fc0b89be4 100644
--- a/drivers/net/wireless/ath/ath10k/sdio.c
+++ b/drivers/net/wireless/ath/ath10k/sdio.c
@@ -794,6 +794,7 @@ static int ath10k_sdio_mbox_proc_dbg_intr(struct ath10k *ar)
 
 	/* TODO: Add firmware crash handling */
 	ath10k_warn(ar, "firmware crashed\n");
+	taint_firmware_crashed();
 
 	/* read counter to clear the interrupt, the debug error interrupt is
 	 * counter 0.
@@ -915,6 +916,7 @@ static int ath10k_sdio_mbox_proc_cpu_intr(struct ath10k *ar)
 	if (cpu_int_status & MBOX_CPU_STATUS_ENABLE_ASSERT_MASK) {
 		ath10k_err(ar, "firmware crashed!\n");
 		queue_work(ar->workqueue, &ar->restart_work);
+		taint_firmware_crashed();
 	}
 	return ret;
 }
diff --git a/drivers/net/wireless/ath/ath10k/snoc.c b/drivers/net/wireless/ath/ath10k/snoc.c
index 354d49b1cd45..071ee7607a4c 100644
--- a/drivers/net/wireless/ath/ath10k/snoc.c
+++ b/drivers/net/wireless/ath/ath10k/snoc.c
@@ -1451,6 +1451,7 @@ void ath10k_snoc_fw_crashed_dump(struct ath10k *ar)
 		scnprintf(guid, sizeof(guid), "n/a");
 
 	ath10k_err(ar, "firmware crashed! (guid %s)\n", guid);
+	taint_firmware_crashed();
 	ath10k_print_driver_info(ar);
 	ath10k_msa_dump_memory(ar, crash_data);
 	mutex_unlock(&ar->dump_mutex);
-- 
2.26.2