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Date: Wed, 14 Oct 2020 10:30:25 -0500
From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To: Tomasz Figa <tfiga@...omium.org>, alsa-devel@...a-project.org
Cc: linux-kernel@...r.kernel.org,
Cezary Rojewski <cezary.rojewski@...el.com>,
Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
Jie Yang <yang.jie@...ux.intel.com>,
Mark Brown <broonie@...nel.org>,
Jaroslav Kysela <perex@...ex.cz>,
Takashi Iwai <tiwai@...e.com>, cujomalainey@...omium.org,
Łukasz Majczak <lmajczak@...gle.com>
Subject: Re: [PATCH] ASoC: Intel: kbl_rt5663_max98927: Fix kabylake_ssp_fixup
function
On 10/14/20 9:16 AM, Tomasz Figa wrote:
> This is a copy of commit 5c5f1baee85a ("ASoC: Intel:
> kbl_rt5663_rt5514_max98927: Fix kabylake_ssp_fixup function") applied to
> the kbl_rt5663_max98927 board file.
>
> Original explanation of the change:
>
> kabylake_ssp_fixup function uses snd_soc_dpcm to identify the
> codecs DAIs. The HW parameters are changed based on the codec DAI of the
> stream. The earlier approach to get snd_soc_dpcm was using container_of()
> macro on snd_pcm_hw_params.
>
> The structures have been modified over time and snd_soc_dpcm does not have
> snd_pcm_hw_params as a reference but as a copy. This causes the current
> driver to crash when used.
>
> This patch changes the way snd_soc_dpcm is extracted. snd_soc_pcm_runtime
> holds 2 dpcm instances (one for playback and one for capture). 2 codecs
> on the SSP are dmic (capture) and speakers (playback). Based on the
> stream direction, snd_soc_dpcm is extracted from snd_soc_pcm_runtime.
>
> Fixes a boot crash on a HP Chromebook x2:
>
> [ 16.582225] BUG: kernel NULL pointer dereference, address: 0000000000000050
> [ 16.582231] #PF: supervisor read access in kernel mode
> [ 16.582233] #PF: error_code(0x0000) - not-present page
> [ 16.582234] PGD 0 P4D 0
> [ 16.582238] Oops: 0000 [#1] PREEMPT SMP PTI
> [ 16.582241] CPU: 0 PID: 1980 Comm: cras Tainted: G C 5.4.58 #1
> [ 16.582243] Hardware name: HP Soraka/Soraka, BIOS Google_Soraka.10431.75.0 08/30/2018
> [ 16.582247] RIP: 0010:kabylake_ssp_fixup+0x19/0xbb [snd_soc_kbl_rt5663_max98927]
> [ 16.582250] Code: c6 6f c5 80 c0 44 89 f2 31 c0 e8 3e c9 4c d6 eb de 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 53 48 89 f3 48 8b 46 c8 48 8b 4e d0 <48> 8b 49 10 4c 8b 78 10 4c 8b 31 4c 89 f7 48 c7 c6 4b c2 80 c0 e8
> [ 16.582252] RSP: 0000:ffffaf7e81e0b958 EFLAGS: 00010282
> [ 16.582254] RAX: ffffffff96f13e0d RBX: ffffaf7e81e0ba00 RCX: 0000000000000040
> [ 16.582256] RDX: ffffaf7e81e0ba00 RSI: ffffaf7e81e0ba00 RDI: ffffa3b208558028
> [ 16.582258] RBP: ffffaf7e81e0b970 R08: ffffa3b203b54160 R09: ffffaf7e81e0ba00
> [ 16.582259] R10: 0000000000000000 R11: ffffffffc080b345 R12: ffffa3b209fb6e00
> [ 16.582261] R13: ffffa3b1b1a47838 R14: ffffa3b1e6197f28 R15: ffffaf7e81e0ba00
> [ 16.582263] FS: 00007eb3f25aaf80(0000) GS:ffffa3b236a00000(0000) knlGS:0000000000000000
> [ 16.582265] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 16.582267] CR2: 0000000000000050 CR3: 0000000246bc8006 CR4: 00000000003606f0
> [ 16.582269] Call Trace:
> [ 16.582275] snd_soc_link_be_hw_params_fixup+0x21/0x68
> [ 16.582278] snd_soc_dai_hw_params+0x25/0x94
> [ 16.582282] soc_pcm_hw_params+0x2d8/0x583
> [ 16.582288] dpcm_be_dai_hw_params+0x172/0x29e
> [ 16.582291] dpcm_fe_dai_hw_params+0x9f/0x12f
> [ 16.582295] snd_pcm_hw_params+0x137/0x41c
> [ 16.582298] snd_pcm_hw_params_user+0x3c/0x71
> [ 16.582301] snd_pcm_common_ioctl+0x2c6/0x565
> [ 16.582304] snd_pcm_ioctl+0x32/0x36
> [ 16.582307] do_vfs_ioctl+0x506/0x783
> [ 16.582311] ksys_ioctl+0x58/0x83
> [ 16.582313] __x64_sys_ioctl+0x1a/0x1e
> [ 16.582316] do_syscall_64+0x54/0x7e
> [ 16.582319] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [ 16.582322] RIP: 0033:0x7eb3f1886157
> [ 16.582324] Code: 8a 66 90 48 8b 05 11 dd 2b 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 dc 2b 00 f7 d8 64 89 01 48
> [ 16.582326] RSP: 002b:00007ffff7559818 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> [ 16.582329] RAX: ffffffffffffffda RBX: 00005acc9188b140 RCX: 00007eb3f1886157
> [ 16.582330] RDX: 00007ffff7559940 RSI: 00000000c2604111 RDI: 000000000000001e
> [ 16.582332] RBP: 00007ffff7559840 R08: 0000000000000004 R09: 0000000000000000
> [ 16.582333] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000bb80
> [ 16.582335] R13: 00005acc91702e80 R14: 00007ffff7559940 R15: 00005acc91702e80
> [ 16.582337] Modules linked in: rfcomm cmac algif_hash algif_skcipher af_alg uinput hid_google_hammer snd_soc_kbl_rt5663_max98927 snd_soc_hdac_hdmi snd_soc_dmic snd_soc_skl_ssp_clk snd_soc_skl snd_soc_sst_ipc snd_soc_sst_dsp snd_soc_hdac_hda snd_soc_acpi_intel_match snd_soc_acpi snd_hda_ext_core snd_intel_dspcfg snd_hda_codec snd_hwdep snd_hda_core ipu3_cio2 ipu3_imgu(C) videobuf2_v4l2 videobuf2_common videobuf2_dma_sg videobuf2_memops snd_soc_rt5663 snd_soc_max98927 snd_soc_rl6231 ov5670 ov13858 acpi_als v4l2_fwnode dw9714 fuse xt_MASQUERADE iio_trig_sysfs cros_ec_light_prox cros_ec_sensors cros_ec_sensors_core cros_ec_sensors_ring industrialio_triggered_buffer kfifo_buf industrialio cros_ec_sensorhub cdc_ether usbnet btusb btrtl btintel btbcm bluetooth ecdh_generic ecc lzo_rle lzo_compress iwlmvm zram iwl7000_mac80211 r8152 mii iwlwifi cfg80211 joydev
> [ 16.584243] gsmi: Log Shutdown Reason 0x03
> [ 16.584246] CR2: 0000000000000050
> [ 16.584248] ---[ end trace c8511d090c11edff ]---
>
> Suggested-by: Łukasz Majczak <lmajczak@...gle.com>
> Fixes: 2e5894d73789e ("ASoC: pcm: Add support for DAI multicodec")
> Signed-off-by: Tomasz Figa <tfiga@...omium.org>
Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Thanks!
> ---
> sound/soc/intel/boards/kbl_rt5663_max98927.c | 39 ++++++++++++++++----
> 1 file changed, 31 insertions(+), 8 deletions(-)
>
> diff --git a/sound/soc/intel/boards/kbl_rt5663_max98927.c b/sound/soc/intel/boards/kbl_rt5663_max98927.c
> index 3ea4602dfb3e..9a4b3d0973f6 100644
> --- a/sound/soc/intel/boards/kbl_rt5663_max98927.c
> +++ b/sound/soc/intel/boards/kbl_rt5663_max98927.c
> @@ -401,17 +401,40 @@ static int kabylake_ssp_fixup(struct snd_soc_pcm_runtime *rtd,
> struct snd_interval *chan = hw_param_interval(params,
> SNDRV_PCM_HW_PARAM_CHANNELS);
> struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
> - struct snd_soc_dpcm *dpcm = container_of(
> - params, struct snd_soc_dpcm, hw_params);
> - struct snd_soc_dai_link *fe_dai_link = dpcm->fe->dai_link;
> - struct snd_soc_dai_link *be_dai_link = dpcm->be->dai_link;
> + struct snd_soc_dpcm *dpcm, *rtd_dpcm = NULL;
> +
> + /*
> + * The following loop will be called only for playback stream
> + * In this platform, there is only one playback device on every SSP
> + */
> + for_each_dpcm_fe(rtd, SNDRV_PCM_STREAM_PLAYBACK, dpcm) {
> + rtd_dpcm = dpcm;
> + break;
> + }
> +
> + /*
> + * This following loop will be called only for capture stream
> + * In this platform, there is only one capture device on every SSP
> + */
> + for_each_dpcm_fe(rtd, SNDRV_PCM_STREAM_CAPTURE, dpcm) {
> + rtd_dpcm = dpcm;
> + break;
> + }
> +
> + if (!rtd_dpcm)
> + return -EINVAL;
> +
> + /*
> + * The above 2 loops are mutually exclusive based on the stream direction,
> + * thus rtd_dpcm variable will never be overwritten
> + */
>
> /*
> * The ADSP will convert the FE rate to 48k, stereo, 24 bit
> */
> - if (!strcmp(fe_dai_link->name, "Kbl Audio Port") ||
> - !strcmp(fe_dai_link->name, "Kbl Audio Headset Playback") ||
> - !strcmp(fe_dai_link->name, "Kbl Audio Capture Port")) {
> + if (!strcmp(rtd_dpcm->fe->dai_link->name, "Kbl Audio Port") ||
> + !strcmp(rtd_dpcm->fe->dai_link->name, "Kbl Audio Headset Playback") ||
> + !strcmp(rtd_dpcm->fe->dai_link->name, "Kbl Audio Capture Port")) {
> rate->min = rate->max = 48000;
> chan->min = chan->max = 2;
> snd_mask_none(fmt);
> @@ -421,7 +444,7 @@ static int kabylake_ssp_fixup(struct snd_soc_pcm_runtime *rtd,
> * The speaker on the SSP0 supports S16_LE and not S24_LE.
> * thus changing the mask here
> */
> - if (!strcmp(be_dai_link->name, "SSP0-Codec"))
> + if (!strcmp(rtd_dpcm->be->dai_link->name, "SSP0-Codec"))
> snd_mask_set_format(fmt, SNDRV_PCM_FORMAT_S16_LE);
>
> return 0;
>
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