[igt-dev] [PATCH v2 i-g-t 19/23] tests/core_hotunplug: Unload snd driver before i915 unbind
venkata.sai.patnana at intel.com
venkata.sai.patnana at intel.com
Thu Jun 3 14:40:18 UTC 2021
From: Uma Shankar <uma.shankar at intel.com>
Unload the snd module before unbinding i915. Audio holds a wakeref
which triggers a warning otherwise, resulting in below warning and
test failure. Currently HSW/BDW and DG1 are the platforms affected,
can be extended to other platforms as well.
<4> [137.001006] ------------[ cut here ]------------
<4> [137.001010] i915 0000:00:02.0: i915 raw-wakerefs=1 wakelocks=1 on cleanup
<4> [137.001076] WARNING: CPU: 0 PID: 1417 at drivers/gpu/drm/i915/intel_runtime_pm.c:619 intel_runtime_pm_driver_release+0x56/0x60 [i915]
<4> [137.001078] Modules linked in: snd_hda_intel i915 snd_hda_codec_hdmi mei_hdcp intel_pmt_telemetry intel_pmt_core x86_pkg_temp_thermal coretemp smsc75xx crct10dif_pclmul usbnet crc32_pclmul mii ghash_clmulni_intel kvm_intel e1000e snd_intel_dspcfg snd_hda_codec snd_hwdep snd_hda_core ptp pps_core mei_me snd_pcm mei prime_numbers intel_pmt [last unloaded: i915]
<4> [137.001095] CPU: 0 PID: 1417 Comm: kworker/u16:7 Tainted: G U 5.9.0-g79478e23b1878-DII_3204+ #1
<4> [137.001097] Hardware name: Intel Corporation Tiger Lake Client Platform/TigerLake U DDR4 SODIMM RVP, BIOS TGLSFWI1.R00.3197.A00.2005110542 05/11/2020
<4> [137.001102] Workqueue: events_unbound async_run_entry_fn
<4> [137.001140] RIP: 0010:intel_runtime_pm_driver_release+0x56/0x60 [i915]
<4> [137.001142] Code: fd 10 4c 8b 67 50 4d 85 e4 75 03 4c 8b 27 e8 91 59 58 e1 45 89 e8 89 e9 4c 89 e2 48 89 c6 48 c7 c7 b0 f3 48 a0 e8 55 25 ef e0 <0f> 0b eb b5 66 0f 1f 44 00 00 48 8b 87 88 45 ff ff b9 02 00 00 00
<4> [137.001144] RSP: 0018:ffffc900007dbd68 EFLAGS: 00010286
<4> [137.001147] RAX: 0000000000000000 RBX: ffff88847338bea8 RCX: 0000000000000001
<4> [137.001148] RDX: 0000000080000001 RSI: ffffffff823efa86 RDI: 00000000ffffffff
<4> [137.001150] RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000001
<4> [137.001152] R10: 000000009bda34df R11: 00000000e2a8a89a R12: ffff88849b209880
<4> [137.001153] R13: 0000000000000001 R14: ffff88847338bea8 R15: ffff88847338fcc0
<4> [137.001155] FS: 0000000000000000(0000) GS:ffff8884a0600000(0000) knlGS:0000000000000000
<4> [137.001157] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4> [137.001159] CR2: 00007fc03597dd88 CR3: 0000000006610005 CR4: 0000000000770ef0
<4> [137.001160] PKRU: 55555554
<4> [137.001162] Call Trace:
<4> [137.001199] i915_drm_suspend_late+0x102/0x120 [i915]
<4> [137.001204] ? pci_pm_poweroff_late+0x30/0x30
<4> [137.001209] dpm_run_callback+0x61/0x270
<4> [137.001214] __device_suspend_late+0x8b/0x180
<4> [137.001217] async_suspend_late+0x15/0x90
<4> [137.001220] async_run_entry_fn+0x34/0x160
<4> [137.001224] process_one_work+0x26c/0x5c0
<4> [137.001231] worker_thread+0x37/0x380
<4> [137.001235] ? process_one_work+0x5c0/0x5c0
<4> [137.001238] kthread+0x149/0x170
<4> [137.001241] ? kthread_park+0x80/0x80
<4> [137.001246] ret_from_fork+0x1f/0x30
<4> [137.001256] irq event stamp: 2329
v2: Extended the WA to HSW/BDW, added an igt warning on unload to keep
visibility on the issue as suggested by Janusz
v3: Merged the revert of earlier WA within this patch and added
a flag to track the WA, as suggested by Janusz.
Cc: Kai Vehmanen <kai.vehmanen at linux.intel.com>
Cc: Janusz Krzysztofik <janusz.krzysztofik at linux.intel.com>
Signed-off-by: Uma Shankar <uma.shankar at intel.com>
---
tests/core_hotunplug.c | 53 +++++++++++++++++++++++++++++++-----------
1 file changed, 40 insertions(+), 13 deletions(-)
diff --git a/tests/core_hotunplug.c b/tests/core_hotunplug.c
index a639cfb4b4..878efcc7bf 100644
--- a/tests/core_hotunplug.c
+++ b/tests/core_hotunplug.c
@@ -29,6 +29,7 @@
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
+#include <signal.h>
#include "i915/gem.h"
#include "i915/gem_create.h"
@@ -53,6 +54,7 @@ struct hotunplug {
const char *failure;
bool need_healthcheck;
bool has_intel_perf;
+ bool snd_unload;
};
/* Helpers */
@@ -138,6 +140,34 @@ static void prepare(struct hotunplug *priv)
static void driver_unbind(struct hotunplug *priv, const char *prefix,
int timeout)
{
+ /**
+ * FIXME: Unbinding the i915 driver on affected platforms with
+ * audio results in a kernel WARN on "i915 raw-wakerefs=1
+ * wakelocks=1 on cleanup". The below CI friendly user level
+ * workaround to unload and de-couple audio from IGT testing,
+ * prevents the warning from appearing. Drop this hack as soon
+ * as this is fixed in the kernel. unbind/re-bind validation
+ * on audio side is not robust and we could have potential
+ * failures blocking display CI, currently this seems to the
+ * safest and easiest way out.
+ */
+ if (priv->snd_unload) {
+ igt_terminate_process(SIGTERM, "alsactl");
+
+ /* unbind snd_hda_intel */
+ kick_snd_hda_intel();
+
+ if (igt_kmod_unload("snd_hda_intel", 0)) {
+ priv->snd_unload = false;
+ igt_warn("Could not unload snd_hda_intel\n");
+ igt_kmod_list_loaded();
+ igt_lsof("/dev/snd");
+ igt_skip("Audio is in use, skipping\n");
+ } else {
+ igt_warn("Preventively unloaded snd_hda_intel\n");
+ }
+ }
+
local_debug("%sunbinding the driver from the device\n", prefix);
priv->failure = "Driver unbind failure!";
@@ -166,6 +196,9 @@ static void driver_bind(struct hotunplug *priv, int timeout)
igt_fail_on_f(faccessat(priv->fd.sysfs_drv, priv->dev_bus_addr,
F_OK, 0),
"Rebound device not present!\n");
+
+ if (priv->snd_unload)
+ igt_kmod_load("snd_hda_intel", NULL);
}
/* Remove (virtually unplug) the device from its bus */
@@ -574,6 +607,7 @@ igt_main
.failure = NULL,
.need_healthcheck = true,
.has_intel_perf = false,
+ .snd_unload = false,
};
igt_fixture {
@@ -585,23 +619,16 @@ igt_main
if (is_i915_device(fd_drm)) {
uint32_t devid = intel_get_drm_devid(fd_drm);
+ if ((IS_HASWELL(devid) || IS_BROADWELL(devid) ||
+ IS_DG1(devid)) && (igt_kmod_is_loaded("snd_hda_intel"))) {
+ igt_debug("Enable WA to unload snd driver\n");
+ priv.snd_unload = true;
+ }
+
gem_quiescent_gpu(fd_drm);
igt_require_gem(fd_drm);
priv.has_intel_perf = local_i915_perf_healthcheck(fd_drm);
-
- /**
- * FIXME: Unbinding the i915 driver on some Haswell
- * platforms with Azalia audio results in a kernel WARN
- * on "i915 raw-wakerefs=1 wakelocks=1 on cleanup". The
- * below CI friendly user level workaround prevents the
- * warning from appearing. Drop this hack as soon as
- * this is fixed in the kernel.
- */
- if (igt_warn_on_f(IS_HASWELL(devid) ||
- IS_BROADWELL(devid),
- "Manually enabling audio PM to work around a kernel WARN\n"))
- igt_pm_enable_audio_runtime_pm();
}
/* Make sure subtests always reopen the same device */
--
2.25.1
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