From patchwork Tue Aug 24 20:14:32 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ferry Toth X-Patchwork-Id: 12455787 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5015FC4338F for ; Tue, 24 Aug 2021 20:35:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 298EE6121E for ; Tue, 24 Aug 2021 20:35:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235006AbhHXUgZ (ORCPT ); Tue, 24 Aug 2021 16:36:25 -0400 Received: from mailfilter02-out40.webhostingserver.nl ([195.211.72.22]:41795 "EHLO mailfilter02-out40.webhostingserver.nl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234941AbhHXUgZ (ORCPT ); Tue, 24 Aug 2021 16:36:25 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=exalondelft.nl; s=whs1; h=content-transfer-encoding:mime-version:message-id:date:subject:cc:to:from: from; bh=pO7TNRIb6JSKmZPlcGilxXCPGrDmrzQdllO644a0/fM=; b=cf8qy+z/Ni3tbSqfe0s4P36ZjLmfZBO6lb9nvUmWBe6DxGrcWFVUMNK3eDsoeof2o3xQtcJMkIe42 urbNFk9WZtAl4JWr8HZNcomxn1i7aks9rg2/Hk80w4RZ+4wvYDDIYujej8tUJzQM14/FZW9BDafphQ O95uTHNU1i3tCrkbsOYGA3/7pwigh2/RaQy6ApGPbXE9ii6n1AcqcdPKYUQLBKkKen2EMm3dyP9fma 2px02T2toUkFXH8gV6Co6mw80jhW27tQcaEWJ5EhRZ4XoGMITCH2gJ5j7BgEGC/rfENvr8byYgsulo eQwcXHeq8/irRY0y3dmuZchxZJ9c0MQ== X-Halon-ID: 99b3193d-0518-11ec-a0ff-001a4a4cb922 Received: from s198.webhostingserver.nl (s198.webhostingserver.nl [141.138.168.154]) by mailfilter02.webhostingserver.nl (Halon) with ESMTPSA id 99b3193d-0518-11ec-a0ff-001a4a4cb922; Tue, 24 Aug 2021 22:19:35 +0200 (CEST) Received: from [2001:981:6fec:1:a2a7:9be0:8d3d:f950] (helo=localhost.localdomain) by s198.webhostingserver.nl with esmtpa (Exim 4.94.2) (envelope-from ) id 1mIctV-007aM4-EG; Tue, 24 Aug 2021 22:19:35 +0200 From: Ferry Toth To: Greg Kroah-Hartman , Jerome Brunet , Ruslan Bilovol , Oded Gabbay , Cezary Rojewski , Ferry Toth , Mauro Carvalho Chehab , Pawel Laszczak , Felipe Balbi , Jack Pham , linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, linux-doc@vger.kernel.org Cc: Jonathan Corbet , Lorenzo Colitti , Wesley Cheng , robh+dt@kernel.org, agross@kernel.org, bjorn.andersson@linaro.org, frowand.list@gmail.com, devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org, heikki.krogerus@linux.intel.com, Thinh Nguyen , Andy Shevchenko , Pavel Hofman , Ferry Toth Subject: [PATCH v1 1/3] Revert "usb: gadget: u_audio: add real feedback implementation" Date: Tue, 24 Aug 2021 22:14:32 +0200 Message-Id: <20210824201433.11385-1-ftoth@exalondelft.nl> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-Antivirus-Scanner: Clean mail though you should still use an Antivirus Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org This reverts commit e89bb4288378b85c82212b60dc98ecda6b3d3a70. The commit is part of a series with commit 24f779dac8f3efb9629adc0e486914d93dc45517 causing a BUG on dwc3 hardware, at least on Intel Merrifield platform when configured through configfs: BUG: kernel NULL pointer dereference, address: 0000000000000008 ... RIP: 0010:dwc3_gadget_del_and_unmap_request+0x19/0xe0 ... Call Trace: dwc3_remove_requests.constprop.0+0x12f/0x170 __dwc3_gadget_ep_disable+0x7a/0x160 dwc3_gadget_ep_disable+0x3d/0xd0 usb_ep_disable+0x1c/0x70 u_audio_stop_capture+0x79/0x120 [u_audio] afunc_set_alt+0x73/0x80 [usb_f_uac2] composite_setup+0x224/0x1b90 [libcomposite] Pavel's suggestion to add `echo "adaptive" > functions/uac2.usb0/c_sync` to the configfs script resolves the issue. Thinh suggests "the crash is probably because of f_uac2 prematurely freeing feedback request before its completion. usb_ep_dequeue() is asynchronous. dwc2() may treat it as a synchronous call so you didn't get a crash." Revert as this is a regression and the kernel shouldn't crash depending on configuration parameters. Reported-by: Ferry Toth --- .../ABI/testing/configfs-usb-gadget-uac2 | 1 - Documentation/usb/gadget-testing.rst | 1 - drivers/usb/gadget/function/f_uac2.c | 9 +- drivers/usb/gadget/function/u_audio.c | 124 ++---------------- drivers/usb/gadget/function/u_audio.h | 9 -- drivers/usb/gadget/function/u_uac2.h | 2 - 6 files changed, 10 insertions(+), 136 deletions(-) diff --git a/Documentation/ABI/testing/configfs-usb-gadget-uac2 b/Documentation/ABI/testing/configfs-usb-gadget-uac2 index 26fb8e9b4e61..e7e59d7fb12f 100644 --- a/Documentation/ABI/testing/configfs-usb-gadget-uac2 +++ b/Documentation/ABI/testing/configfs-usb-gadget-uac2 @@ -9,7 +9,6 @@ Description: c_srate capture sampling rate c_ssize capture sample size (bytes) c_sync capture synchronization type (async/adaptive) - fb_max maximum extra bandwidth in async mode p_chmask playback channel mask p_srate playback sampling rate p_ssize playback sample size (bytes) diff --git a/Documentation/usb/gadget-testing.rst b/Documentation/usb/gadget-testing.rst index 9d6276f82774..f5a12667bd41 100644 --- a/Documentation/usb/gadget-testing.rst +++ b/Documentation/usb/gadget-testing.rst @@ -729,7 +729,6 @@ The uac2 function provides these attributes in its function directory: c_srate capture sampling rate c_ssize capture sample size (bytes) c_sync capture synchronization type (async/adaptive) - fb_max maximum extra bandwidth in async mode p_chmask playback channel mask p_srate playback sampling rate p_ssize playback sample size (bytes) diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c index ae29ff2b2b68..321e6c05ba93 100644 --- a/drivers/usb/gadget/function/f_uac2.c +++ b/drivers/usb/gadget/function/f_uac2.c @@ -584,11 +584,8 @@ static int set_ep_max_packet_size(const struct f_uac2_opts *uac2_opts, ssize = uac2_opts->c_ssize; } - if (!is_playback && (uac2_opts->c_sync == USB_ENDPOINT_SYNC_ASYNC)) - srate = srate * (1000 + uac2_opts->fb_max) / 1000; - max_size_bw = num_channels(chmask) * ssize * - DIV_ROUND_UP(srate, factor / (1 << (ep_desc->bInterval - 1))); + ((srate / (factor / (1 << (ep_desc->bInterval - 1)))) + 1); ep_desc->wMaxPacketSize = cpu_to_le16(min_t(u16, max_size_bw, max_size_ep)); @@ -960,7 +957,6 @@ afunc_bind(struct usb_configuration *cfg, struct usb_function *fn) agdev->params.c_srate = uac2_opts->c_srate; agdev->params.c_ssize = uac2_opts->c_ssize; agdev->params.req_number = uac2_opts->req_number; - agdev->params.fb_max = uac2_opts->fb_max; ret = g_audio_setup(agdev, "UAC2 PCM", "UAC2_Gadget"); if (ret) goto err_free_descs; @@ -1333,7 +1329,6 @@ UAC2_ATTRIBUTE(c_srate); UAC2_ATTRIBUTE_SYNC(c_sync); UAC2_ATTRIBUTE(c_ssize); UAC2_ATTRIBUTE(req_number); -UAC2_ATTRIBUTE(fb_max); static struct configfs_attribute *f_uac2_attrs[] = { &f_uac2_opts_attr_p_chmask, @@ -1344,7 +1339,6 @@ static struct configfs_attribute *f_uac2_attrs[] = { &f_uac2_opts_attr_c_ssize, &f_uac2_opts_attr_c_sync, &f_uac2_opts_attr_req_number, - &f_uac2_opts_attr_fb_max, NULL, }; @@ -1384,7 +1378,6 @@ static struct usb_function_instance *afunc_alloc_inst(void) opts->c_ssize = UAC2_DEF_CSSIZE; opts->c_sync = UAC2_DEF_CSYNC; opts->req_number = UAC2_DEF_REQ_NUM; - opts->fb_max = UAC2_DEF_FB_MAX; return &opts->func_inst; } diff --git a/drivers/usb/gadget/function/u_audio.c b/drivers/usb/gadget/function/u_audio.c index 018dd0978995..f637ebec80b0 100644 --- a/drivers/usb/gadget/function/u_audio.c +++ b/drivers/usb/gadget/function/u_audio.c @@ -16,7 +16,6 @@ #include #include #include -#include #include "u_audio.h" @@ -36,12 +35,12 @@ struct uac_rtd_params { void *rbuf; - unsigned int pitch; /* Stream pitch ratio to 1000000 */ unsigned int max_psize; /* MaxPacketSize of endpoint */ struct usb_request **reqs; struct usb_request *req_fback; /* Feedback endpoint request */ + unsigned int ffback; /* Real frequency reported by feedback endpoint */ bool fb_ep_enabled; /* if the ep is enabled */ }; @@ -76,29 +75,18 @@ static const struct snd_pcm_hardware uac_pcm_hardware = { }; static void u_audio_set_fback_frequency(enum usb_device_speed speed, - unsigned long long freq, - unsigned int pitch, - void *buf) + unsigned int freq, void *buf) { u32 ff = 0; - /* - * Because the pitch base is 1000000, the final divider here - * will be 1000 * 1000000 = 1953125 << 9 - * - * Instead of dealing with big numbers lets fold this 9 left shift - */ - if (speed == USB_SPEED_FULL) { /* * Full-speed feedback endpoints report frequency - * in samples/frame + * in samples/microframe * Format is encoded in Q10.10 left-justified in the 24 bits, * so that it has a Q10.14 format. - * - * ff = (freq << 14) / 1000 */ - freq <<= 5; + ff = DIV_ROUND_UP((freq << 14), 1000); } else { /* * High-speed feedback endpoints report frequency @@ -106,14 +94,9 @@ static void u_audio_set_fback_frequency(enum usb_device_speed speed, * Format is encoded in Q12.13 fitted into four bytes so that * the binary point is located between the second and the third * byte fromat (that is Q16.16) - * - * ff = (freq << 16) / 8000 */ - freq <<= 4; + ff = DIV_ROUND_UP((freq << 13), 1000); } - - ff = DIV_ROUND_CLOSEST_ULL((freq * pitch), 1953125); - *(__le32 *)buf = cpu_to_le32(ff); } @@ -226,8 +209,8 @@ static void u_audio_iso_fback_complete(struct usb_ep *ep, struct uac_rtd_params *prm = req->context; struct snd_uac_chip *uac = prm->uac; struct g_audio *audio_dev = uac->audio_dev; - struct uac_params *params = &audio_dev->params; int status = req->status; + unsigned long flags; /* i/f shutting down */ if (!prm->fb_ep_enabled || req->status == -ESHUTDOWN) @@ -242,8 +225,7 @@ static void u_audio_iso_fback_complete(struct usb_ep *ep, __func__, status, req->actual, req->length); u_audio_set_fback_frequency(audio_dev->gadget->speed, - params->c_srate, prm->pitch, - req->buf); + prm->ffback, req->buf); if (usb_ep_queue(ep, req, GFP_ATOMIC)) dev_err(uac->card->dev, "%d Error!\n", __LINE__); @@ -498,10 +480,9 @@ int u_audio_start_capture(struct g_audio *audio_dev) * Always start with original frequency since its deviation can't * be meauserd at start of playback */ - prm->pitch = 1000000; + prm->ffback = params->c_srate; u_audio_set_fback_frequency(audio_dev->gadget->speed, - params->c_srate, prm->pitch, - req_fback->buf); + prm->ffback, req_fback->buf); if (usb_ep_queue(ep_fback, req_fback, GFP_ATOMIC)) dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); @@ -597,82 +578,12 @@ void u_audio_stop_playback(struct g_audio *audio_dev) } EXPORT_SYMBOL_GPL(u_audio_stop_playback); -static int u_audio_pitch_info(struct snd_kcontrol *kcontrol, - struct snd_ctl_elem_info *uinfo) -{ - struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol); - struct snd_uac_chip *uac = prm->uac; - struct g_audio *audio_dev = uac->audio_dev; - struct uac_params *params = &audio_dev->params; - unsigned int pitch_min, pitch_max; - - pitch_min = (1000 - FBACK_SLOW_MAX) * 1000; - pitch_max = (1000 + params->fb_max) * 1000; - - uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; - uinfo->count = 1; - uinfo->value.integer.min = pitch_min; - uinfo->value.integer.max = pitch_max; - uinfo->value.integer.step = 1; - return 0; -} - -static int u_audio_pitch_get(struct snd_kcontrol *kcontrol, - struct snd_ctl_elem_value *ucontrol) -{ - struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol); - - ucontrol->value.integer.value[0] = prm->pitch; - - return 0; -} - -static int u_audio_pitch_put(struct snd_kcontrol *kcontrol, - struct snd_ctl_elem_value *ucontrol) -{ - struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol); - struct snd_uac_chip *uac = prm->uac; - struct g_audio *audio_dev = uac->audio_dev; - struct uac_params *params = &audio_dev->params; - unsigned int val; - unsigned int pitch_min, pitch_max; - int change = 0; - - pitch_min = (1000 - FBACK_SLOW_MAX) * 1000; - pitch_max = (1000 + params->fb_max) * 1000; - - val = ucontrol->value.integer.value[0]; - - if (val < pitch_min) - val = pitch_min; - if (val > pitch_max) - val = pitch_max; - - if (prm->pitch != val) { - prm->pitch = val; - change = 1; - } - - return change; -} - -static const struct snd_kcontrol_new u_audio_controls[] = { -{ - .iface = SNDRV_CTL_ELEM_IFACE_PCM, - .name = "Capture Pitch 1000000", - .info = u_audio_pitch_info, - .get = u_audio_pitch_get, - .put = u_audio_pitch_put, -}, -}; - int g_audio_setup(struct g_audio *g_audio, const char *pcm_name, const char *card_name) { struct snd_uac_chip *uac; struct snd_card *card; struct snd_pcm *pcm; - struct snd_kcontrol *kctl; struct uac_params *params; int p_chmask, c_chmask; int err; @@ -760,23 +671,6 @@ int g_audio_setup(struct g_audio *g_audio, const char *pcm_name, snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &uac_pcm_ops); snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &uac_pcm_ops); - if (c_chmask && g_audio->in_ep_fback) { - strscpy(card->mixername, card_name, sizeof(card->driver)); - - kctl = snd_ctl_new1(&u_audio_controls[0], &uac->c_prm); - if (!kctl) { - err = -ENOMEM; - goto snd_fail; - } - - kctl->id.device = pcm->device; - kctl->id.subdevice = 0; - - err = snd_ctl_add(card, kctl); - if (err < 0) - goto snd_fail; - } - strscpy(card->driver, card_name, sizeof(card->driver)); strscpy(card->shortname, card_name, sizeof(card->shortname)); sprintf(card->longname, "%s %i", card_name, card->dev->id); diff --git a/drivers/usb/gadget/function/u_audio.h b/drivers/usb/gadget/function/u_audio.h index a218cdf771fe..53e6baf55cbf 100644 --- a/drivers/usb/gadget/function/u_audio.h +++ b/drivers/usb/gadget/function/u_audio.h @@ -11,14 +11,6 @@ #include -/* - * Same maximum frequency deviation on the slower side as in - * sound/usb/endpoint.c. Value is expressed in per-mil deviation. - * The maximum deviation on the faster side will be provided as - * parameter, as it impacts the endpoint required bandwidth. - */ -#define FBACK_SLOW_MAX 250 - struct uac_params { /* playback */ int p_chmask; /* channel mask */ @@ -31,7 +23,6 @@ struct uac_params { int c_ssize; /* sample size */ int req_number; /* number of preallocated requests */ - int fb_max; /* upper frequency drift feedback limit per-mil */ }; struct g_audio { diff --git a/drivers/usb/gadget/function/u_uac2.h b/drivers/usb/gadget/function/u_uac2.h index 179d3ef6a195..13589c3c805c 100644 --- a/drivers/usb/gadget/function/u_uac2.h +++ b/drivers/usb/gadget/function/u_uac2.h @@ -23,7 +23,6 @@ #define UAC2_DEF_CSSIZE 2 #define UAC2_DEF_CSYNC USB_ENDPOINT_SYNC_ASYNC #define UAC2_DEF_REQ_NUM 2 -#define UAC2_DEF_FB_MAX 5 struct f_uac2_opts { struct usb_function_instance func_inst; @@ -35,7 +34,6 @@ struct f_uac2_opts { int c_ssize; int c_sync; int req_number; - int fb_max; bool bound; struct mutex lock;