From patchwork Thu Mar 23 21:10:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manish Mandlik X-Patchwork-Id: 666281 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1287EC6FD1C for ; Thu, 23 Mar 2023 21:10:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231346AbjCWVK3 (ORCPT ); Thu, 23 Mar 2023 17:10:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37694 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229625AbjCWVK2 (ORCPT ); Thu, 23 Mar 2023 17:10:28 -0400 Received: from mail-pj1-x1049.google.com (mail-pj1-x1049.google.com [IPv6:2607:f8b0:4864:20::1049]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CB0B124C83 for ; Thu, 23 Mar 2023 14:10:25 -0700 (PDT) Received: by mail-pj1-x1049.google.com with SMTP id o10-20020a17090ac08a00b0023f3196fa6fso1323698pjs.2 for ; Thu, 23 Mar 2023 14:10:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; t=1679605825; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=jZhVO8fhX5S0B6hNgwRSXbVhGLvceCnx/d0fQZ5dkvE=; b=mM2To+D3jZzdrRmU1EbS0ws+L3fj25/Sx4+JakFu2hEPtHAuCr67uKcAo/6FESSC/5 vFlQyh7VJJW0+gGMn8KUv5ObCmanvY2H8YG+L4LxbWwmizTSZDTD622dKeC9oewzXpc5 Ye8dotlqQNIbTBycyitvllpUpe7tDzPN3elN0aKDSAlMhdoRt3l7d/mlGara7y23Uc8O 3+zjtxxrniIj7QEaDZz0OIBjz4WInRSKsI69nAUKGuzxRBAvJ6tjTth04+X68Wz/lWiU hqXukPzitQgEpW9xMvdRm10uSQNpVxPXctnHhrD42bnnqut0r4uwX+ranNZKBdshIWpm 0mAA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679605825; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=jZhVO8fhX5S0B6hNgwRSXbVhGLvceCnx/d0fQZ5dkvE=; b=0f+HCi+OXsSpwuSkwyQr37Fdsxt44v5DYXARzSXQuBV1pJSVwG1bUdfLvreUFf+Xvu LVgE0/ha1dxXPWvM0AyKXc538LC4e/Zxrqqy+fNIzu50OaYr48UQHjhwg6SgxfFksvZJ mdk5enN8Lq7BwoLq1v4sIoX0wAy7gzUmyrkwVcQ31KnfOYbV1MPEI+y46L5QKWbgVjHw /8PADkOVRLo25Fw/FzfR3tcOjheodGrv0QCVIi53s9NMTkJZgp7oxJalFfH4RtsOvxa2 5qcMwVtaEIbrVrddF7KVIjBbU9sN1oEv1sP9jeTBagOneWia2MA45qw7+HsrIoG5KrPo bVbA== X-Gm-Message-State: AO0yUKVLGKef0yWVGGL2WgHsyPHDnzkgZAsh8qptzh1gYUW5ZwkSS1pb yX6Vtm8UyjLG/9xm3XUnM7bwn7VoFRScrQ== X-Google-Smtp-Source: AK7set/5CLZR79wGOQKwpn9DWMPdLVfHArqmRj1XQtt7KKbHuhf/eIzcen2yh/p64Rz4r3HCaAaPI8Iuy3OfrQ== X-Received: from mmandlik-cloudtop.c.googlers.com ([fda3:e722:ac3:cc00:24:72f4:c0a8:2893]) (user=mmandlik job=sendgmr) by 2002:a65:6447:0:b0:50f:aafa:6bc9 with SMTP id s7-20020a656447000000b0050faafa6bc9mr2424029pgv.6.1679605824864; Thu, 23 Mar 2023 14:10:24 -0700 (PDT) Date: Thu, 23 Mar 2023 14:10:15 -0700 Mime-Version: 1.0 X-Mailer: git-send-email 2.40.0.348.gf938b09366-goog Message-ID: <20230323140942.v8.1.I9b4e4818bab450657b19cda3497d363c9baa616e@changeid> Subject: [PATCH v8 1/4] Bluetooth: Add support for hci devcoredump From: Manish Mandlik To: marcel@holtmann.org, luiz.dentz@gmail.com Cc: linux-bluetooth@vger.kernel.org, chromeos-bluetooth-upstreaming@chromium.org, Abhishek Pandit-Subedi , Manish Mandlik , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Johan Hedberg , Paolo Abeni , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org From: Abhishek Pandit-Subedi Add devcoredump APIs to hci core so that drivers only have to provide the dump skbs instead of managing the synchronization and timeouts. The devcoredump APIs should be used in the following manner: - hci_devcoredump_init is called to allocate the dump. - hci_devcoredump_append is called to append any skbs with dump data OR hci_devcoredump_append_pattern is called to insert a pattern. - hci_devcoredump_complete is called when all dump packets have been sent OR hci_devcoredump_abort is called to indicate an error and cancel an ongoing dump collection. The high level APIs just prepare some skbs with the appropriate data and queue it for the dump to process. Packets part of the crashdump can be intercepted in the driver in interrupt context and forwarded directly to the devcoredump APIs. Internally, there are 5 states for the dump: idle, active, complete, abort and timeout. A devcoredump will only be in active state after it has been initialized. Once active, it accepts data to be appended, patterns to be inserted (i.e. memset) and a completion event or an abort event to generate a devcoredump. The timeout is initialized at the same time the dump is initialized (defaulting to 10s) and will be cleared either when the timeout occurs or the dump is complete or aborted. Signed-off-by: Abhishek Pandit-Subedi Signed-off-by: Manish Mandlik Reviewed-by: Abhishek Pandit-Subedi --- Changes in v8: - Update hci_devcoredump_mkheader() and .dmp_hdr() to use skb Changes in v6: - Remove #ifdef from .c and move to function in .h as per suggestion - Remove coredump_enabled from hci_devcoredump struct since the sysfs flag related change has been abandoned Changes in v4: - Add .enabled() and .coredump() to hci_devcoredump struct Changes in v3: - Add attribute to enable/disable and set default state to disabled Changes in v2: - Move hci devcoredump implementation to new files - Move dump queue and dump work to hci_devcoredump struct - Add CONFIG_DEV_COREDUMP conditional compile include/net/bluetooth/coredump.h | 114 +++++++ include/net/bluetooth/hci_core.h | 14 + net/bluetooth/Makefile | 2 + net/bluetooth/coredump.c | 508 +++++++++++++++++++++++++++++++ net/bluetooth/hci_core.c | 1 + net/bluetooth/hci_sync.c | 2 + 6 files changed, 641 insertions(+) create mode 100644 include/net/bluetooth/coredump.h create mode 100644 net/bluetooth/coredump.c diff --git a/include/net/bluetooth/coredump.h b/include/net/bluetooth/coredump.h new file mode 100644 index 000000000000..168b1afb5c33 --- /dev/null +++ b/include/net/bluetooth/coredump.h @@ -0,0 +1,114 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2022 Google Corporation + */ + +#ifndef __COREDUMP_H +#define __COREDUMP_H + +#define DEVCOREDUMP_TIMEOUT msecs_to_jiffies(10000) /* 10 sec */ + +typedef void (*coredump_t)(struct hci_dev *hdev); +typedef void (*dmp_hdr_t)(struct hci_dev *hdev, struct sk_buff *skb); +typedef void (*notify_change_t)(struct hci_dev *hdev, int state); + +/* struct hci_devcoredump - Devcoredump state + * + * @supported: Indicates if FW dump collection is supported by driver + * @state: Current state of dump collection + * @alloc_size: Total size of the dump + * @head: Start of the dump + * @tail: Pointer to current end of dump + * @end: head + alloc_size for easy comparisons + * + * @dump_q: Dump queue for state machine to process + * @dump_rx: Devcoredump state machine work + * @dump_timeout: Devcoredump timeout work + * + * @coredump: Called from the driver's .coredump() function. + * @dmp_hdr: Create a dump header to identify controller/fw/driver info + * @notify_change: Notify driver when devcoredump state has changed + */ +struct hci_devcoredump { + bool supported; + + enum devcoredump_state { + HCI_DEVCOREDUMP_IDLE, + HCI_DEVCOREDUMP_ACTIVE, + HCI_DEVCOREDUMP_DONE, + HCI_DEVCOREDUMP_ABORT, + HCI_DEVCOREDUMP_TIMEOUT + } state; + + size_t alloc_size; + char *head; + char *tail; + char *end; + + struct sk_buff_head dump_q; + struct work_struct dump_rx; + struct delayed_work dump_timeout; + + coredump_t coredump; + dmp_hdr_t dmp_hdr; + notify_change_t notify_change; +}; + +#ifdef CONFIG_DEV_COREDUMP + +void hci_devcoredump_reset(struct hci_dev *hdev); +void hci_devcoredump_rx(struct work_struct *work); +void hci_devcoredump_timeout(struct work_struct *work); + +int hci_devcoredump_register(struct hci_dev *hdev, coredump_t coredump, + dmp_hdr_t dmp_hdr, notify_change_t notify_change); +int hci_devcoredump_init(struct hci_dev *hdev, u32 dmp_size); +int hci_devcoredump_append(struct hci_dev *hdev, struct sk_buff *skb); +int hci_devcoredump_append_pattern(struct hci_dev *hdev, u8 pattern, u32 len); +int hci_devcoredump_complete(struct hci_dev *hdev); +int hci_devcoredump_abort(struct hci_dev *hdev); + +#else + +static inline void hci_devcoredump_reset(struct hci_dev *hdev) {} +static inline void hci_devcoredump_rx(struct work_struct *work) {} +static inline void hci_devcoredump_timeout(struct work_struct *work) {} + +static inline int hci_devcoredump_register(struct hci_dev *hdev, + coredump_t coredump, + dmp_hdr_t dmp_hdr, + notify_change_t notify_change) +{ + return -EOPNOTSUPP; +} + +static inline int hci_devcoredump_init(struct hci_dev *hdev, u32 dmp_size) +{ + return -EOPNOTSUPP; +} + +static inline int hci_devcoredump_append(struct hci_dev *hdev, + struct sk_buff *skb) +{ + return -EOPNOTSUPP; +} + +static inline int hci_devcoredump_append_pattern(struct hci_dev *hdev, + u8 pattern, u32 len) +{ + return -EOPNOTSUPP; +} + +static inline int hci_devcoredump_complete(struct hci_dev *hdev) +{ + return -EOPNOTSUPP; +} + +static inline int hci_devcoredump_abort(struct hci_dev *hdev) +{ + return -EOPNOTSUPP; +} + +#endif /* CONFIG_DEV_COREDUMP */ + +#endif /* __COREDUMP_H */ diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h index 9488671c1219..e405fd4d25db 100644 --- a/include/net/bluetooth/hci_core.h +++ b/include/net/bluetooth/hci_core.h @@ -32,6 +32,7 @@ #include #include #include +#include /* HCI priority */ #define HCI_PRIO_MAX 7 @@ -590,6 +591,10 @@ struct hci_dev { const char *fw_info; struct dentry *debugfs; +#ifdef CONFIG_DEV_COREDUMP + struct hci_devcoredump dump; +#endif + struct device dev; struct rfkill *rfkill; @@ -1496,6 +1501,15 @@ static inline void hci_set_aosp_capable(struct hci_dev *hdev) #endif } +static inline void hci_devcoredump_setup(struct hci_dev *hdev) +{ +#ifdef CONFIG_DEV_COREDUMP + INIT_WORK(&hdev->dump.dump_rx, hci_devcoredump_rx); + INIT_DELAYED_WORK(&hdev->dump.dump_timeout, hci_devcoredump_timeout); + skb_queue_head_init(&hdev->dump.dump_q); +#endif +} + int hci_dev_open(__u16 dev); int hci_dev_close(__u16 dev); int hci_dev_do_close(struct hci_dev *hdev); diff --git a/net/bluetooth/Makefile b/net/bluetooth/Makefile index 0e7b7db42750..141ac1fda0bf 100644 --- a/net/bluetooth/Makefile +++ b/net/bluetooth/Makefile @@ -17,6 +17,8 @@ bluetooth-y := af_bluetooth.o hci_core.o hci_conn.o hci_event.o mgmt.o \ ecdh_helper.o hci_request.o mgmt_util.o mgmt_config.o hci_codec.o \ eir.o hci_sync.o +bluetooth-$(CONFIG_DEV_COREDUMP) += coredump.o + bluetooth-$(CONFIG_BT_BREDR) += sco.o bluetooth-$(CONFIG_BT_LE) += iso.o bluetooth-$(CONFIG_BT_HS) += a2mp.o amp.o diff --git a/net/bluetooth/coredump.c b/net/bluetooth/coredump.c new file mode 100644 index 000000000000..c4bf408baef6 --- /dev/null +++ b/net/bluetooth/coredump.c @@ -0,0 +1,508 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2022 Google Corporation + */ + +#include + +#include +#include + +enum hci_devcoredump_pkt_type { + HCI_DEVCOREDUMP_PKT_INIT, + HCI_DEVCOREDUMP_PKT_SKB, + HCI_DEVCOREDUMP_PKT_PATTERN, + HCI_DEVCOREDUMP_PKT_COMPLETE, + HCI_DEVCOREDUMP_PKT_ABORT, +}; + +struct hci_devcoredump_skb_cb { + u16 pkt_type; +}; + +struct hci_devcoredump_skb_pattern { + u8 pattern; + u32 len; +} __packed; + +#define hci_dmp_cb(skb) ((struct hci_devcoredump_skb_cb *)((skb)->cb)) + +#define MAX_DEVCOREDUMP_HDR_SIZE 512 /* bytes */ + +static int hci_devcoredump_update_hdr_state(char *buf, size_t size, int state) +{ + int len = 0; + + if (!buf) + return 0; + + len = snprintf(buf, size, "Bluetooth devcoredump\nState: %d\n", state); + + return len + 1; /* snprintf adds \0 at the end upon state rewrite */ +} + +/* Call with hci_dev_lock only. */ +static int hci_devcoredump_update_state(struct hci_dev *hdev, int state) +{ + hdev->dump.state = state; + + return hci_devcoredump_update_hdr_state(hdev->dump.head, + hdev->dump.alloc_size, state); +} + +static int hci_devcoredump_mkheader(struct hci_dev *hdev, struct sk_buff *skb) +{ + char dump_start[] = "--- Start dump ---\n"; + char hdr[80]; + int hdr_len; + + hdr_len = hci_devcoredump_update_hdr_state(hdr, sizeof(hdr), + HCI_DEVCOREDUMP_IDLE); + skb_put_data(skb, hdr, hdr_len); + + if (hdev->dump.dmp_hdr) + hdev->dump.dmp_hdr(hdev, skb); + + skb_put_data(skb, dump_start, strlen(dump_start)); + + return skb->len; +} + +/* Do not call with hci_dev_lock since this calls driver code. */ +static void hci_devcoredump_notify(struct hci_dev *hdev, int state) +{ + if (hdev->dump.notify_change) + hdev->dump.notify_change(hdev, state); +} + +/* Call with hci_dev_lock only. */ +void hci_devcoredump_reset(struct hci_dev *hdev) +{ + hdev->dump.head = NULL; + hdev->dump.tail = NULL; + hdev->dump.alloc_size = 0; + + hci_devcoredump_update_state(hdev, HCI_DEVCOREDUMP_IDLE); + + cancel_delayed_work(&hdev->dump.dump_timeout); + skb_queue_purge(&hdev->dump.dump_q); +} + +/* Call with hci_dev_lock only. */ +static void hci_devcoredump_free(struct hci_dev *hdev) +{ + if (hdev->dump.head) + vfree(hdev->dump.head); + + hci_devcoredump_reset(hdev); +} + +/* Call with hci_dev_lock only. */ +static int hci_devcoredump_alloc(struct hci_dev *hdev, u32 size) +{ + hdev->dump.head = vmalloc(size); + if (!hdev->dump.head) + return -ENOMEM; + + hdev->dump.alloc_size = size; + hdev->dump.tail = hdev->dump.head; + hdev->dump.end = hdev->dump.head + size; + + hci_devcoredump_update_state(hdev, HCI_DEVCOREDUMP_IDLE); + + return 0; +} + +/* Call with hci_dev_lock only. */ +static bool hci_devcoredump_copy(struct hci_dev *hdev, char *buf, u32 size) +{ + if (hdev->dump.tail + size > hdev->dump.end) + return false; + + memcpy(hdev->dump.tail, buf, size); + hdev->dump.tail += size; + + return true; +} + +/* Call with hci_dev_lock only. */ +static bool hci_devcoredump_memset(struct hci_dev *hdev, u8 pattern, u32 len) +{ + if (hdev->dump.tail + len > hdev->dump.end) + return false; + + memset(hdev->dump.tail, pattern, len); + hdev->dump.tail += len; + + return true; +} + +/* Call with hci_dev_lock only. */ +static int hci_devcoredump_prepare(struct hci_dev *hdev, u32 dump_size) +{ + struct sk_buff *skb = NULL; + int dump_hdr_size; + int err = 0; + + skb = alloc_skb(MAX_DEVCOREDUMP_HDR_SIZE, GFP_ATOMIC); + if (!skb) { + bt_dev_err(hdev, "Failed to allocate devcoredump prepare"); + return -ENOMEM; + } + + dump_hdr_size = hci_devcoredump_mkheader(hdev, skb); + + if (hci_devcoredump_alloc(hdev, dump_hdr_size + dump_size)) { + err = -ENOMEM; + goto hdr_free; + } + + /* Insert the device header */ + if (!hci_devcoredump_copy(hdev, skb->data, skb->len)) { + bt_dev_err(hdev, "Failed to insert header"); + hci_devcoredump_free(hdev); + + err = -ENOMEM; + goto hdr_free; + } + +hdr_free: + if (skb) + kfree_skb(skb); + + return err; +} + +/* Bluetooth devcoredump state machine. + * + * Devcoredump states: + * + * HCI_DEVCOREDUMP_IDLE: The default state. + * + * HCI_DEVCOREDUMP_ACTIVE: A devcoredump will be in this state once it has + * been initialized using hci_devcoredump_init(). Once active, the + * driver can append data using hci_devcoredump_append() or insert + * a pattern using hci_devcoredump_append_pattern(). + * + * HCI_DEVCOREDUMP_DONE: Once the dump collection is complete, the drive + * can signal the completion using hci_devcoredump_complete(). A + * devcoredump is generated indicating the completion event and + * then the state machine is reset to the default state. + * + * HCI_DEVCOREDUMP_ABORT: The driver can cancel ongoing dump collection in + * case of any error using hci_devcoredump_abort(). A devcoredump + * is still generated with the available data indicating the abort + * event and then the state machine is reset to the default state. + * + * HCI_DEVCOREDUMP_TIMEOUT: A timeout timer for HCI_DEVCOREDUMP_TIMEOUT sec + * is started during devcoredump initialization. Once the timeout + * occurs, the driver is notified, a devcoredump is generated with + * the available data indicating the timeout event and then the + * state machine is reset to the default state. + * + * The driver must register using hci_devcoredump_register() before using the + * hci devcoredump APIs. + */ +void hci_devcoredump_rx(struct work_struct *work) +{ + struct hci_dev *hdev = container_of(work, struct hci_dev, dump.dump_rx); + struct sk_buff *skb; + struct hci_devcoredump_skb_pattern *pattern; + u32 dump_size; + int start_state; + +#define DBG_UNEXPECTED_STATE() \ + bt_dev_dbg(hdev, \ + "Unexpected packet (%d) for state (%d). ", \ + hci_dmp_cb(skb)->pkt_type, hdev->dump.state) + + while ((skb = skb_dequeue(&hdev->dump.dump_q))) { + hci_dev_lock(hdev); + start_state = hdev->dump.state; + + switch (hci_dmp_cb(skb)->pkt_type) { + case HCI_DEVCOREDUMP_PKT_INIT: + if (hdev->dump.state != HCI_DEVCOREDUMP_IDLE) { + DBG_UNEXPECTED_STATE(); + goto loop_continue; + } + + if (skb->len != sizeof(dump_size)) { + bt_dev_dbg(hdev, "Invalid dump init pkt"); + goto loop_continue; + } + + dump_size = *((u32 *)skb->data); + if (!dump_size) { + bt_dev_err(hdev, "Zero size dump init pkt"); + goto loop_continue; + } + + if (hci_devcoredump_prepare(hdev, dump_size)) { + bt_dev_err(hdev, "Failed to prepare for dump"); + goto loop_continue; + } + + hci_devcoredump_update_state(hdev, + HCI_DEVCOREDUMP_ACTIVE); + queue_delayed_work(hdev->workqueue, + &hdev->dump.dump_timeout, + DEVCOREDUMP_TIMEOUT); + break; + + case HCI_DEVCOREDUMP_PKT_SKB: + if (hdev->dump.state != HCI_DEVCOREDUMP_ACTIVE) { + DBG_UNEXPECTED_STATE(); + goto loop_continue; + } + + if (!hci_devcoredump_copy(hdev, skb->data, skb->len)) + bt_dev_dbg(hdev, "Failed to insert skb"); + break; + + case HCI_DEVCOREDUMP_PKT_PATTERN: + if (hdev->dump.state != HCI_DEVCOREDUMP_ACTIVE) { + DBG_UNEXPECTED_STATE(); + goto loop_continue; + } + + if (skb->len != sizeof(*pattern)) { + bt_dev_dbg(hdev, "Invalid pattern skb"); + goto loop_continue; + } + + pattern = (void *)skb->data; + + if (!hci_devcoredump_memset(hdev, pattern->pattern, + pattern->len)) + bt_dev_dbg(hdev, "Failed to set pattern"); + break; + + case HCI_DEVCOREDUMP_PKT_COMPLETE: + if (hdev->dump.state != HCI_DEVCOREDUMP_ACTIVE) { + DBG_UNEXPECTED_STATE(); + goto loop_continue; + } + + hci_devcoredump_update_state(hdev, + HCI_DEVCOREDUMP_DONE); + dump_size = hdev->dump.tail - hdev->dump.head; + + bt_dev_info(hdev, + "Devcoredump complete with size %u " + "(expect %zu)", + dump_size, hdev->dump.alloc_size); + + dev_coredumpv(&hdev->dev, hdev->dump.head, dump_size, + GFP_KERNEL); + break; + + case HCI_DEVCOREDUMP_PKT_ABORT: + if (hdev->dump.state != HCI_DEVCOREDUMP_ACTIVE) { + DBG_UNEXPECTED_STATE(); + goto loop_continue; + } + + hci_devcoredump_update_state(hdev, + HCI_DEVCOREDUMP_ABORT); + dump_size = hdev->dump.tail - hdev->dump.head; + + bt_dev_info(hdev, + "Devcoredump aborted with size %u " + "(expect %zu)", + dump_size, hdev->dump.alloc_size); + + /* Emit a devcoredump with the available data */ + dev_coredumpv(&hdev->dev, hdev->dump.head, dump_size, + GFP_KERNEL); + break; + + default: + bt_dev_dbg(hdev, + "Unknown packet (%d) for state (%d). ", + hci_dmp_cb(skb)->pkt_type, hdev->dump.state); + break; + } + +loop_continue: + kfree_skb(skb); + hci_dev_unlock(hdev); + + if (start_state != hdev->dump.state) + hci_devcoredump_notify(hdev, hdev->dump.state); + + hci_dev_lock(hdev); + if (hdev->dump.state == HCI_DEVCOREDUMP_DONE || + hdev->dump.state == HCI_DEVCOREDUMP_ABORT) + hci_devcoredump_reset(hdev); + hci_dev_unlock(hdev); + } +} +EXPORT_SYMBOL(hci_devcoredump_rx); + +void hci_devcoredump_timeout(struct work_struct *work) +{ + struct hci_dev *hdev = container_of(work, struct hci_dev, + dump.dump_timeout.work); + u32 dump_size; + + hci_devcoredump_notify(hdev, HCI_DEVCOREDUMP_TIMEOUT); + + hci_dev_lock(hdev); + + cancel_work_sync(&hdev->dump.dump_rx); + + hci_devcoredump_update_state(hdev, HCI_DEVCOREDUMP_TIMEOUT); + dump_size = hdev->dump.tail - hdev->dump.head; + bt_dev_info(hdev, "Devcoredump timeout with size %u (expect %zu)", + dump_size, hdev->dump.alloc_size); + + /* Emit a devcoredump with the available data */ + dev_coredumpv(&hdev->dev, hdev->dump.head, dump_size, GFP_KERNEL); + + hci_devcoredump_reset(hdev); + + hci_dev_unlock(hdev); +} +EXPORT_SYMBOL(hci_devcoredump_timeout); + +int hci_devcoredump_register(struct hci_dev *hdev, coredump_t coredump, + dmp_hdr_t dmp_hdr, notify_change_t notify_change) +{ + /* Driver must implement coredump() and dmp_hdr() functions for + * bluetooth devcoredump. The coredump() should trigger a coredump + * event on the controller when the device's coredump sysfs entry is + * written to. The dmp_hdr() should create a dump header to identify + * the controller/fw/driver info. + */ + if (!coredump || !dmp_hdr) + return -EINVAL; + + hci_dev_lock(hdev); + hdev->dump.coredump = coredump; + hdev->dump.dmp_hdr = dmp_hdr; + hdev->dump.notify_change = notify_change; + hdev->dump.supported = true; + hci_dev_unlock(hdev); + + return 0; +} +EXPORT_SYMBOL(hci_devcoredump_register); + +static inline bool hci_devcoredump_enabled(struct hci_dev *hdev) +{ + return hdev->dump.supported; +} + +int hci_devcoredump_init(struct hci_dev *hdev, u32 dmp_size) +{ + struct sk_buff *skb = NULL; + + if (!hci_devcoredump_enabled(hdev)) + return -EOPNOTSUPP; + + skb = alloc_skb(sizeof(dmp_size), GFP_ATOMIC); + if (!skb) { + bt_dev_err(hdev, "Failed to allocate devcoredump init"); + return -ENOMEM; + } + + hci_dmp_cb(skb)->pkt_type = HCI_DEVCOREDUMP_PKT_INIT; + skb_put_data(skb, &dmp_size, sizeof(dmp_size)); + + skb_queue_tail(&hdev->dump.dump_q, skb); + queue_work(hdev->workqueue, &hdev->dump.dump_rx); + + return 0; +} +EXPORT_SYMBOL(hci_devcoredump_init); + +int hci_devcoredump_append(struct hci_dev *hdev, struct sk_buff *skb) +{ + if (!skb) + return -ENOMEM; + + if (!hci_devcoredump_enabled(hdev)) { + kfree_skb(skb); + return -EOPNOTSUPP; + } + + hci_dmp_cb(skb)->pkt_type = HCI_DEVCOREDUMP_PKT_SKB; + + skb_queue_tail(&hdev->dump.dump_q, skb); + queue_work(hdev->workqueue, &hdev->dump.dump_rx); + + return 0; +} +EXPORT_SYMBOL(hci_devcoredump_append); + +int hci_devcoredump_append_pattern(struct hci_dev *hdev, u8 pattern, u32 len) +{ + struct hci_devcoredump_skb_pattern p; + struct sk_buff *skb = NULL; + + if (!hci_devcoredump_enabled(hdev)) + return -EOPNOTSUPP; + + skb = alloc_skb(sizeof(p), GFP_ATOMIC); + if (!skb) { + bt_dev_err(hdev, "Failed to allocate devcoredump pattern"); + return -ENOMEM; + } + + p.pattern = pattern; + p.len = len; + + hci_dmp_cb(skb)->pkt_type = HCI_DEVCOREDUMP_PKT_PATTERN; + skb_put_data(skb, &p, sizeof(p)); + + skb_queue_tail(&hdev->dump.dump_q, skb); + queue_work(hdev->workqueue, &hdev->dump.dump_rx); + + return 0; +} +EXPORT_SYMBOL(hci_devcoredump_append_pattern); + +int hci_devcoredump_complete(struct hci_dev *hdev) +{ + struct sk_buff *skb = NULL; + + if (!hci_devcoredump_enabled(hdev)) + return -EOPNOTSUPP; + + skb = alloc_skb(0, GFP_ATOMIC); + if (!skb) { + bt_dev_err(hdev, "Failed to allocate devcoredump complete"); + return -ENOMEM; + } + + hci_dmp_cb(skb)->pkt_type = HCI_DEVCOREDUMP_PKT_COMPLETE; + + skb_queue_tail(&hdev->dump.dump_q, skb); + queue_work(hdev->workqueue, &hdev->dump.dump_rx); + + return 0; +} +EXPORT_SYMBOL(hci_devcoredump_complete); + +int hci_devcoredump_abort(struct hci_dev *hdev) +{ + struct sk_buff *skb = NULL; + + if (!hci_devcoredump_enabled(hdev)) + return -EOPNOTSUPP; + + skb = alloc_skb(0, GFP_ATOMIC); + if (!skb) { + bt_dev_err(hdev, "Failed to allocate devcoredump abort"); + return -ENOMEM; + } + + hci_dmp_cb(skb)->pkt_type = HCI_DEVCOREDUMP_PKT_ABORT; + + skb_queue_tail(&hdev->dump.dump_q, skb); + queue_work(hdev->workqueue, &hdev->dump.dump_rx); + + return 0; +} +EXPORT_SYMBOL(hci_devcoredump_abort); diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index 334e308451f5..37aa70192ccb 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -2544,6 +2544,7 @@ struct hci_dev *hci_alloc_dev_priv(int sizeof_priv) INIT_DELAYED_WORK(&hdev->cmd_timer, hci_cmd_timeout); INIT_DELAYED_WORK(&hdev->ncmd_timer, hci_ncmd_timeout); + hci_devcoredump_setup(hdev); hci_request_setup(hdev); hci_init_sysfs(hdev); diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c index 561a519a11bd..e0423867ff19 100644 --- a/net/bluetooth/hci_sync.c +++ b/net/bluetooth/hci_sync.c @@ -4722,6 +4722,8 @@ int hci_dev_open_sync(struct hci_dev *hdev) goto done; } + hci_devcoredump_reset(hdev); + set_bit(HCI_RUNNING, &hdev->flags); hci_sock_dev_event(hdev, HCI_DEV_OPEN); From patchwork Thu Mar 23 21:10:16 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manish Mandlik X-Patchwork-Id: 667022 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E7973C74A5B for ; Thu, 23 Mar 2023 21:10:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231417AbjCWVKb (ORCPT ); Thu, 23 Mar 2023 17:10:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37730 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231128AbjCWVK3 (ORCPT ); Thu, 23 Mar 2023 17:10:29 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 903A624CAD for ; Thu, 23 Mar 2023 14:10:27 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id i11-20020a256d0b000000b0086349255277so23829945ybc.8 for ; Thu, 23 Mar 2023 14:10:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; t=1679605827; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=vb8xGekqLZEVswI0VXnWBbiOZDnEjcKbHS0+1g7cZR4=; b=L+DAp2MOt1+8vAsdO/zxTmqAUl6PsMPqtBeQXy0P2jSvlukJIyVJjOqgOPy+UKV0H1 x8mmXxHbULbceu1L/ka66cuA4w8ZH/XyUJ44nLaTPk7I9F//Ec4Wo6lS8yM9lkJN3ypB l1f0sysmj7ibeMdHoDuVJQhymiW98UsjMmaM+yvpS2So+/jfS44Ufv2LizHWFmuZULEV VmubLNxsmTe3nS8ksdXCCb9k1Ue5Etede03yupybyDCPn0AtuvPa42GQciMCtb8rWtff T56hLVMzbANMVRr9jAYbjE0Hhp41GCzLeGyLKVbaJjl1U3dpdeLdjuhn0ZwyItVTW5Pj uNGg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679605827; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=vb8xGekqLZEVswI0VXnWBbiOZDnEjcKbHS0+1g7cZR4=; b=qm/clA8nMedDiy8KZBf5wjvlxA9HJpbi+/p45/5g8SL+UesHXXnEmgoc8eyWu00JpF F8HAfmUo0Sq1ec+YbJKVb1LAW3EsX/QCJDh1uPptw3BFqY2TlglypaCCnXvNVF0Nyppz kNUasjBSYnl/KeCuYXaaSfQofAaGd7LtxrZEqS0NhWiJBZ44pk2DAwQN72LVvgF1mhDl 2tBLRvAejEOVLFwoYkYIRD7ke1MxKyx+ZIpT8xvMdEUZznZM6DrnogbGcI+qJk8Rsa2s PYwYDHKxHsCNUsQYnWHGMnMdzkl3LPs2doWOr1XvVytyzzNvn5MKVY1Z3RRDlkwOgKTu d04g== X-Gm-Message-State: AAQBX9c8SQxNA7LcRdCbzEPIfCqDnBoFME1tltTKU+PF77NHCoX8GI+Q SBKApmmXz8Y0Nt1tH8dx5F8g9jBgV9hm8g== X-Google-Smtp-Source: AKy350bu4TW4l20Z3Ldxb/R0F1xir4olYbbOOl5RxmNznamXu2tiEKHzmbLClVF0jJHQciyDqGDlbu6V9qqTdg== X-Received: from mmandlik-cloudtop.c.googlers.com ([fda3:e722:ac3:cc00:24:72f4:c0a8:2893]) (user=mmandlik job=sendgmr) by 2002:a81:a782:0:b0:541:a17f:c77d with SMTP id e124-20020a81a782000000b00541a17fc77dmr2498836ywh.10.1679605826783; Thu, 23 Mar 2023 14:10:26 -0700 (PDT) Date: Thu, 23 Mar 2023 14:10:16 -0700 In-Reply-To: <20230323140942.v8.1.I9b4e4818bab450657b19cda3497d363c9baa616e@changeid> Mime-Version: 1.0 References: <20230323140942.v8.1.I9b4e4818bab450657b19cda3497d363c9baa616e@changeid> X-Mailer: git-send-email 2.40.0.348.gf938b09366-goog Message-ID: <20230323140942.v8.2.Ief9a81a3643d2291f6db2b3695c3a6e0159467dc@changeid> Subject: [PATCH v8 2/4] Bluetooth: Add vhci devcoredump support From: Manish Mandlik To: marcel@holtmann.org, luiz.dentz@gmail.com Cc: linux-bluetooth@vger.kernel.org, chromeos-bluetooth-upstreaming@chromium.org, Manish Mandlik , Johan Hedberg , linux-kernel@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org Add devcoredump support for vhci that creates forcce_devcoredump debugfs entry. This is used for mgmt-tester tests. Signed-off-by: Manish Mandlik --- Changes in v8: - Update vhci_coredump_hdr() to use skb Changes in v7: - New patch in the series drivers/bluetooth/Kconfig | 1 + drivers/bluetooth/hci_vhci.c | 64 ++++++++++++++++++++++++++++++++++++ 2 files changed, 65 insertions(+) diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig index 5a1a7bec3c42..7bc7a765ad69 100644 --- a/drivers/bluetooth/Kconfig +++ b/drivers/bluetooth/Kconfig @@ -363,6 +363,7 @@ config BT_HCIBLUECARD config BT_HCIVHCI tristate "HCI VHCI (Virtual HCI device) driver" + select WANT_DEV_COREDUMP help Bluetooth Virtual HCI device driver. This driver is required if you want to use HCI Emulation software. diff --git a/drivers/bluetooth/hci_vhci.c b/drivers/bluetooth/hci_vhci.c index c443c3b0a4da..1c3c27b7e9b6 100644 --- a/drivers/bluetooth/hci_vhci.c +++ b/drivers/bluetooth/hci_vhci.c @@ -278,6 +278,67 @@ static int vhci_setup(struct hci_dev *hdev) return 0; } +static void vhci_coredump(struct hci_dev *hdev) +{ + /* No need to do anything */ +} + +static void vhci_coredump_hdr(struct hci_dev *hdev, struct sk_buff *skb) +{ + char buf[80]; + + snprintf(buf, sizeof(buf), "Controller Name: vhci_ctrl\n"); + skb_put_data(skb, buf, strlen(buf)); + + snprintf(buf, sizeof(buf), "Firmware Version: vhci_fw\n"); + skb_put_data(skb, buf, strlen(buf)); + + snprintf(buf, sizeof(buf), "Driver: vhci_drv\n"); + skb_put_data(skb, buf, strlen(buf)); + + snprintf(buf, sizeof(buf), "Vendor: vhci\n"); + skb_put_data(skb, buf, strlen(buf)); +} + +static ssize_t force_devcoredump_write(struct file *file, + const char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct vhci_data *data = file->private_data; + struct hci_dev *hdev = data->hdev; + struct sk_buff *skb = NULL; + char buf[512]; + int ret; + + ret = simple_write_to_buffer(&buf, sizeof(buf), ppos, user_buf, count); + if (ret < count) + return ret; + + skb = alloc_skb(count, GFP_ATOMIC); + if (!skb) + return -ENOMEM; + skb_put_data(skb, &buf, count); + + hci_devcoredump_register(hdev, vhci_coredump, vhci_coredump_hdr, NULL); + + ret = hci_devcoredump_init(hdev, skb->len); + if (ret) { + BT_ERR("Failed to generate devcoredump"); + kfree_skb(skb); + return ret; + } + + hci_devcoredump_append(hdev, skb); + hci_devcoredump_complete(hdev); + + return count; +} + +static const struct file_operations force_devcoredump_fops = { + .open = simple_open, + .write = force_devcoredump_write, +}; + static int __vhci_create_device(struct vhci_data *data, __u8 opcode) { struct hci_dev *hdev; @@ -355,6 +416,9 @@ static int __vhci_create_device(struct vhci_data *data, __u8 opcode) debugfs_create_file("aosp_capable", 0644, hdev->debugfs, data, &aosp_capable_fops); + debugfs_create_file("force_devcoredump", 0644, hdev->debugfs, data, + &force_devcoredump_fops); + hci_skb_pkt_type(skb) = HCI_VENDOR_PKT; skb_put_u8(skb, 0xff); From patchwork Thu Mar 23 21:10:17 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manish Mandlik X-Patchwork-Id: 666280 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 169DEC6FD1C for ; Thu, 23 Mar 2023 21:10:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231452AbjCWVKd (ORCPT ); Thu, 23 Mar 2023 17:10:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37746 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231359AbjCWVK3 (ORCPT ); Thu, 23 Mar 2023 17:10:29 -0400 Received: from mail-pl1-x649.google.com (mail-pl1-x649.google.com [IPv6:2607:f8b0:4864:20::649]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AF4411ADE0 for ; Thu, 23 Mar 2023 14:10:28 -0700 (PDT) Received: by mail-pl1-x649.google.com with SMTP id s11-20020a170902a50b00b001a1f8fc0d2cso32304plq.15 for ; Thu, 23 Mar 2023 14:10:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; t=1679605828; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=3IPXOF71xhyJEtqQ3Z98VllJlolVRDwWUwDqo2jNXHo=; b=EhYvkoKvgCCbxOwjd6FuNdq1QrRIoJpWIF7cJLLZ9gASmnAaRc+cEHJaCpIAkfBfUg bL/I+y8T8nHmo6qbtvmbKbUsCqzj9JjBzg++8JYVM78eHpCxyl3oilRt/AnkhiAncn90 IKEK+BWoX5XhAUB973cOyK7Jg9eku+sMNyWkrycSxQkg6o5ID2JM0YuLOybxk61aMjWy M+eFazc3nyJLiG9V//Kqckr/f+am+zrkTAsMgXJAA8+U8h2ZeyouKn18jsnA8LYw6T+9 KSiO0GkQ+3CEqqnpdpnP8IqnkO650sTRlV/DS3G3/UVUwQwjag6wNhfkSwnWsIcw+CJb dM1w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679605828; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=3IPXOF71xhyJEtqQ3Z98VllJlolVRDwWUwDqo2jNXHo=; b=bnrY4e9O6H3F5QqVpNT6ecdK2AMIG5JHXPq17wdfkLwWX+KYWDRYY/gLysjtIRUgcH vKBY6pyXaL7xTG1Ym9KQ+V5+ROJMjSDyNMESvvZcXMGUMVbN6JQ2N6DmW9ZhUhy7wa9d n+WS4vi3DfBKPyIG/Wnppn/foUD+T3MtsVusB8yYS6iEIQfcGCEWzYsXezcUYuFrPQIk X/Q3ZUZ2z0KzVSULnQAPqboI3M63+gpP3JXXZaieHqm6vk0hXIMrPo+9QbDxRsJi2331 AtWgnza7Xn9IjgiXHUOM8JKBZQ3fS8jgeZCArwQOFQY/A40QGTpgIx/lx9OXbh9prxUP 4KYQ== X-Gm-Message-State: AO0yUKWqT5krsZBwLMaAW/ferC6ZqUqb49srMML92+gYvYWZTJ/rWO3+ Z4z52rOaSoWsGlSi+a8fnPWoJ+1Eg1Wc7w== X-Google-Smtp-Source: AK7set8+jv1JzR3p1mgIcB67lMvllj7a5DVGzCsJvMiKKf4L89EIKtT8Ml5k+po/ClBmv1Tb0DZy265BlbJ47w== X-Received: from mmandlik-cloudtop.c.googlers.com ([fda3:e722:ac3:cc00:24:72f4:c0a8:2893]) (user=mmandlik job=sendgmr) by 2002:a65:5086:0:b0:503:7bbb:9a77 with SMTP id r6-20020a655086000000b005037bbb9a77mr2310504pgp.8.1679605828243; Thu, 23 Mar 2023 14:10:28 -0700 (PDT) Date: Thu, 23 Mar 2023 14:10:17 -0700 In-Reply-To: <20230323140942.v8.1.I9b4e4818bab450657b19cda3497d363c9baa616e@changeid> Mime-Version: 1.0 References: <20230323140942.v8.1.I9b4e4818bab450657b19cda3497d363c9baa616e@changeid> X-Mailer: git-send-email 2.40.0.348.gf938b09366-goog Message-ID: <20230323140942.v8.3.I8cd97c192e8268567b6f467ccd993ec71897318e@changeid> Subject: [PATCH v8 3/4] Bluetooth: btusb: Add btusb devcoredump support From: Manish Mandlik To: marcel@holtmann.org, luiz.dentz@gmail.com Cc: linux-bluetooth@vger.kernel.org, chromeos-bluetooth-upstreaming@chromium.org, Manish Mandlik , Abhishek Pandit-Subedi , Johan Hedberg , linux-kernel@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org This patch implements the btusb driver side .coredump() callback to trigger a devcoredump via sysfs. Signed-off-by: Manish Mandlik Reviewed-by: Abhishek Pandit-Subedi --- (no changes since v6) Changes in v6: - Remove dev->coredump_disabled check since the sysfs flag related change has been abandoned Changes in v4: - New patch in the series drivers/bluetooth/btusb.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index 4ca91c033d2f..9c9f7bf1375a 100644 --- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -4385,6 +4385,17 @@ static int btusb_resume(struct usb_interface *intf) } #endif +#ifdef CONFIG_DEV_COREDUMP +static void btusb_coredump(struct device *dev) +{ + struct btusb_data *data = dev_get_drvdata(dev); + struct hci_dev *hdev = data->hdev; + + if (hdev->dump.coredump) + hdev->dump.coredump(hdev); +} +#endif + static struct usb_driver btusb_driver = { .name = "btusb", .probe = btusb_probe, @@ -4396,6 +4407,14 @@ static struct usb_driver btusb_driver = { .id_table = btusb_table, .supports_autosuspend = 1, .disable_hub_initiated_lpm = 1, + +#ifdef CONFIG_DEV_COREDUMP + .drvwrap = { + .driver = { + .coredump = btusb_coredump, + }, + }, +#endif }; module_usb_driver(btusb_driver); From patchwork Thu Mar 23 21:10:18 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manish Mandlik X-Patchwork-Id: 667021 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 02838C761AF for ; Thu, 23 Mar 2023 21:10:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231438AbjCWVKe (ORCPT ); Thu, 23 Mar 2023 17:10:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37746 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231445AbjCWVKc (ORCPT ); Thu, 23 Mar 2023 17:10:32 -0400 Received: from mail-yw1-x1149.google.com (mail-yw1-x1149.google.com [IPv6:2607:f8b0:4864:20::1149]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A28EB25941 for ; Thu, 23 Mar 2023 14:10:30 -0700 (PDT) Received: by mail-yw1-x1149.google.com with SMTP id 00721157ae682-54574d6204aso54494957b3.15 for ; Thu, 23 Mar 2023 14:10:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; t=1679605830; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=8ytdhHuX3jMSfEHqF2ahkw52uQtlQQOw46P7+8SNYBo=; b=sJlmMKKE+019KNGJPJE0CPHOFuHiucoKH7zkYMt2fHUfWEB+NHCOkIQ/FCIy1jPGtQ utPnfKi4rOQHpYoBD0KCD4qMOmn0wQ9Og6v/LHRL4l9dSnsCrQTRgms4aXcaEJjOxHJp H3i4j6HoQr+vA8Dvdn6XoZYq9pvmA/TKpIH+jVVwBb8lxGAGmlBQ22C2VjnolsyVXLts xDrbpNh2Q67K5Kled/huzz0C9qhYNL99ntDNaImHpxN4P8wspMxlgSUCk26bRBmKkJit w6n/YkyUexg+86V4x4NW7cxkf9Fld8u6I6FYYDJGvYpYpR3nvJ5q+H4gW3q3+/Ue9ZTF MNlw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679605830; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=8ytdhHuX3jMSfEHqF2ahkw52uQtlQQOw46P7+8SNYBo=; b=drcnvZUwbSi9bhdT1mJHTdGe5iJnCA5faurWgJN2BxIO/M8XW+RVo32UQEvg+b4IBC L3APJcE449teC6CJB4Hl/qiD9bHmyY3JaGjW0+Y+RvqzQsCtfBXI1fIdUEPTOmm9nmwZ 22BA3h29NKhOLxe7H9313/m+Bf50fnn9QG56gy5IN/kf2e/X5ZhChwAKieWG03mp0JRa DAxWjKhWAdFtbD+PWuhIdWRHswdF81tk45luvUPrqzO4A+wkdu6Ki4n3zHVWFJ0hAC1R 4XXiGDaC+F2J2Sb7IQkSwaeSTiqLHfxJ8eJVEvMvhZh4KarxVEKkNGutwb5FS4mk5QPG cftQ== X-Gm-Message-State: AAQBX9crlIHmOreNk0RUun9Q/tQ311LjwIknmq6a85XkEg1MyfPQKFEq tQ0yw133mjiqp6VFrq7i/4ko6UU93pvvug== X-Google-Smtp-Source: AKy350Y8qL5seVLBau9tywz4DS26PRzHT3s/1G+XbNC/MtywM1v+IPI4NMFDr0OBE3ERdvQFkL3uarl3lTv9Xw== X-Received: from mmandlik-cloudtop.c.googlers.com ([fda3:e722:ac3:cc00:24:72f4:c0a8:2893]) (user=mmandlik job=sendgmr) by 2002:a05:6902:1108:b0:b6d:fc53:c5c0 with SMTP id o8-20020a056902110800b00b6dfc53c5c0mr452432ybu.1.1679605829933; Thu, 23 Mar 2023 14:10:29 -0700 (PDT) Date: Thu, 23 Mar 2023 14:10:18 -0700 In-Reply-To: <20230323140942.v8.1.I9b4e4818bab450657b19cda3497d363c9baa616e@changeid> Mime-Version: 1.0 References: <20230323140942.v8.1.I9b4e4818bab450657b19cda3497d363c9baa616e@changeid> X-Mailer: git-send-email 2.40.0.348.gf938b09366-goog Message-ID: <20230323140942.v8.4.I8ac78c64382c66cdb49076a2053ef9c44ebf1ea3@changeid> Subject: [PATCH v8 4/4] Bluetooth: btintel: Add Intel devcoredump support From: Manish Mandlik To: marcel@holtmann.org, luiz.dentz@gmail.com Cc: linux-bluetooth@vger.kernel.org, chromeos-bluetooth-upstreaming@chromium.org, Abhishek Pandit-Subedi , Manish Mandlik , Chethan Tumkur Narayan , Johan Hedberg , linux-kernel@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org From: Abhishek Pandit-Subedi Intercept debug exception events from the controller and put them into a devcoredump using hci devcoredump APIs. The debug exception contains data in a TLV format and it will be parsed in userspace. Signed-off-by: Abhishek Pandit-Subedi Signed-off-by: Manish Mandlik Reviewed-by: Abhishek Pandit-Subedi Reviewed-by: Chethan Tumkur Narayan --- Changes in v8: - Update btintel_dmp_hdr() to use skb - Use driver name reference instead of copying it Changes in v7: - Update btintel_coredump() and btusb_intel_diagnostics() Changes in v6: - Implement btintel_coredump() Changes in v4: - Add btintel_coredump() placeholder Changes in v2: - Create a local struct to store coredump_info in btintel.c - Call btintel_register_devcoredump_support() from btintel.c - Fix strncpy() destination bound warning drivers/bluetooth/btintel.c | 72 ++++++++++++++++++++++++++++++++++++- drivers/bluetooth/btintel.h | 12 +++++-- drivers/bluetooth/btusb.c | 54 ++++++++++++++++++++++++---- 3 files changed, 128 insertions(+), 10 deletions(-) diff --git a/drivers/bluetooth/btintel.c b/drivers/bluetooth/btintel.c index bede8b005594..cb84524bbacd 100644 --- a/drivers/bluetooth/btintel.c +++ b/drivers/bluetooth/btintel.c @@ -36,6 +36,12 @@ struct cmd_write_boot_params { u8 fw_build_yy; } __packed; +static struct { + const char *driver_name; + u8 hw_variant; + u32 fw_build_num; +} coredump_info; + int btintel_check_bdaddr(struct hci_dev *hdev) { struct hci_rp_read_bd_addr *bda; @@ -308,6 +314,9 @@ int btintel_version_info(struct hci_dev *hdev, struct intel_version *ver) return -EINVAL; } + coredump_info.hw_variant = ver->hw_variant; + coredump_info.fw_build_num = ver->fw_build_num; + bt_dev_info(hdev, "%s revision %u.%u build %u week %u %u", variant, ver->fw_revision >> 4, ver->fw_revision & 0x0f, ver->fw_build_num, ver->fw_build_ww, @@ -502,6 +511,9 @@ static int btintel_version_info_tlv(struct hci_dev *hdev, return -EINVAL; } + coredump_info.hw_variant = INTEL_HW_VARIANT(version->cnvi_bt); + coredump_info.fw_build_num = version->build_num; + bt_dev_info(hdev, "%s timestamp %u.%u buildtype %u build %u", variant, 2000 + (version->timestamp >> 8), version->timestamp & 0xff, version->build_type, version->build_num); @@ -1453,6 +1465,59 @@ int btintel_set_quality_report(struct hci_dev *hdev, bool enable) } EXPORT_SYMBOL_GPL(btintel_set_quality_report); +static void btintel_coredump(struct hci_dev *hdev) +{ + struct sk_buff *skb; + + skb = __hci_cmd_sync(hdev, 0xfc4e, 0, NULL, HCI_CMD_TIMEOUT); + if (IS_ERR(skb)) { + bt_dev_err(hdev, "Coredump failed (%ld)", PTR_ERR(skb)); + return; + } + + kfree_skb(skb); +} + +static void btintel_dmp_hdr(struct hci_dev *hdev, struct sk_buff *skb) +{ + char buf[80]; + + snprintf(buf, sizeof(buf), "Controller Name: 0x%X\n", + coredump_info.hw_variant); + skb_put_data(skb, buf, strlen(buf)); + + snprintf(buf, sizeof(buf), "Firmware Version: 0x%X\n", + coredump_info.fw_build_num); + skb_put_data(skb, buf, strlen(buf)); + + snprintf(buf, sizeof(buf), "Driver: %s\n", coredump_info.driver_name); + skb_put_data(skb, buf, strlen(buf)); + + snprintf(buf, sizeof(buf), "Vendor: Intel\n"); + skb_put_data(skb, buf, strlen(buf)); +} + +static int btintel_register_devcoredump_support(struct hci_dev *hdev) +{ + struct intel_debug_features features; + int err; + + err = btintel_read_debug_features(hdev, &features); + if (err) { + bt_dev_info(hdev, "Error reading debug features"); + return err; + } + + if (!(features.page1[0] & 0x3f)) { + bt_dev_dbg(hdev, "Telemetry exception format not supported"); + return -EOPNOTSUPP; + } + + hci_devcoredump_register(hdev, btintel_coredump, btintel_dmp_hdr, NULL); + + return err; +} + static const struct firmware *btintel_legacy_rom_get_fw(struct hci_dev *hdev, struct intel_version *ver) { @@ -2582,6 +2647,7 @@ static int btintel_setup_combined(struct hci_dev *hdev) btintel_set_msft_opcode(hdev, ver.hw_variant); err = btintel_bootloader_setup(hdev, &ver); + btintel_register_devcoredump_support(hdev); break; default: bt_dev_err(hdev, "Unsupported Intel hw variant (%u)", @@ -2655,6 +2721,7 @@ static int btintel_setup_combined(struct hci_dev *hdev) btintel_set_msft_opcode(hdev, ver.hw_variant); err = btintel_bootloader_setup(hdev, &ver); + btintel_register_devcoredump_support(hdev); break; case 0x17: case 0x18: @@ -2678,6 +2745,7 @@ static int btintel_setup_combined(struct hci_dev *hdev) INTEL_HW_VARIANT(ver_tlv.cnvi_bt)); err = btintel_bootloader_setup_tlv(hdev, &ver_tlv); + btintel_register_devcoredump_support(hdev); break; default: bt_dev_err(hdev, "Unsupported Intel hw variant (%u)", @@ -2727,7 +2795,7 @@ static int btintel_shutdown_combined(struct hci_dev *hdev) return 0; } -int btintel_configure_setup(struct hci_dev *hdev) +int btintel_configure_setup(struct hci_dev *hdev, const char *driver_name) { hdev->manufacturer = 2; hdev->setup = btintel_setup_combined; @@ -2736,6 +2804,8 @@ int btintel_configure_setup(struct hci_dev *hdev) hdev->set_diag = btintel_set_diag_combined; hdev->set_bdaddr = btintel_set_bdaddr; + coredump_info.driver_name = driver_name; + return 0; } EXPORT_SYMBOL_GPL(btintel_configure_setup); diff --git a/drivers/bluetooth/btintel.h b/drivers/bluetooth/btintel.h index 8e7da877efae..c34553fef3b0 100644 --- a/drivers/bluetooth/btintel.h +++ b/drivers/bluetooth/btintel.h @@ -150,6 +150,13 @@ struct btintel_loc_aware_reg { __le32 delta; } __packed; +#define INTEL_TLV_TYPE_ID 0x01 + +#define INTEL_TLV_SYSTEM_EXCEPTION 0x00 +#define INTEL_TLV_FATAL_EXCEPTION 0x01 +#define INTEL_TLV_DEBUG_EXCEPTION 0x02 +#define INTEL_TLV_TEST_EXCEPTION 0xDE + #define INTEL_HW_PLATFORM(cnvx_bt) ((u8)(((cnvx_bt) & 0x0000ff00) >> 8)) #define INTEL_HW_VARIANT(cnvx_bt) ((u8)(((cnvx_bt) & 0x003f0000) >> 16)) #define INTEL_CNVX_TOP_TYPE(cnvx_top) ((cnvx_top) & 0x00000fff) @@ -219,7 +226,7 @@ int btintel_read_boot_params(struct hci_dev *hdev, struct intel_boot_params *params); int btintel_download_firmware(struct hci_dev *dev, struct intel_version *ver, const struct firmware *fw, u32 *boot_param); -int btintel_configure_setup(struct hci_dev *hdev); +int btintel_configure_setup(struct hci_dev *hdev, const char *driver_name); void btintel_bootup(struct hci_dev *hdev, const void *ptr, unsigned int len); void btintel_secure_send_result(struct hci_dev *hdev, const void *ptr, unsigned int len); @@ -300,7 +307,8 @@ static inline int btintel_download_firmware(struct hci_dev *dev, return -EOPNOTSUPP; } -static inline int btintel_configure_setup(struct hci_dev *hdev) +static inline int btintel_configure_setup(struct hci_dev *hdev, + const char *driver_name) { return -ENODEV; } diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index 9c9f7bf1375a..4f7aa32696f4 100644 --- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -2376,16 +2376,47 @@ static int btusb_recv_bulk_intel(struct btusb_data *data, void *buffer, return btusb_recv_bulk(data, buffer, count); } +static int btusb_intel_diagnostics(struct hci_dev *hdev, struct sk_buff *skb) +{ + struct intel_tlv *tlv = (void *)&skb->data[5]; + + /* The first event is always an event type TLV */ + if (tlv->type != INTEL_TLV_TYPE_ID) + goto recv_frame; + + switch (tlv->val[0]) { + case INTEL_TLV_SYSTEM_EXCEPTION: + case INTEL_TLV_FATAL_EXCEPTION: + case INTEL_TLV_DEBUG_EXCEPTION: + case INTEL_TLV_TEST_EXCEPTION: + /* Generate devcoredump from exception */ + if (!hci_devcoredump_init(hdev, skb->len)) { + hci_devcoredump_append(hdev, skb); + hci_devcoredump_complete(hdev); + } else { + bt_dev_err(hdev, "Failed to generate devcoredump"); + kfree_skb(skb); + } + return 0; + default: + bt_dev_err(hdev, "Invalid exception type %02X", tlv->val[0]); + } + +recv_frame: + return hci_recv_frame(hdev, skb); +} + static int btusb_recv_event_intel(struct hci_dev *hdev, struct sk_buff *skb) { - if (btintel_test_flag(hdev, INTEL_BOOTLOADER)) { - struct hci_event_hdr *hdr = (void *)skb->data; + struct hci_event_hdr *hdr = (void *)skb->data; + const char diagnostics_hdr[] = { 0x87, 0x80, 0x03 }; - if (skb->len > HCI_EVENT_HDR_SIZE && hdr->evt == 0xff && - hdr->plen > 0) { - const void *ptr = skb->data + HCI_EVENT_HDR_SIZE + 1; - unsigned int len = skb->len - HCI_EVENT_HDR_SIZE - 1; + if (skb->len > HCI_EVENT_HDR_SIZE && hdr->evt == 0xff && + hdr->plen > 0) { + const void *ptr = skb->data + HCI_EVENT_HDR_SIZE + 1; + unsigned int len = skb->len - HCI_EVENT_HDR_SIZE - 1; + if (btintel_test_flag(hdev, INTEL_BOOTLOADER)) { switch (skb->data[2]) { case 0x02: /* When switching to the operational firmware @@ -2404,6 +2435,15 @@ static int btusb_recv_event_intel(struct hci_dev *hdev, struct sk_buff *skb) break; } } + + /* Handle all diagnostics events separately. May still call + * hci_recv_frame. + */ + if (len >= sizeof(diagnostics_hdr) && + memcmp(&skb->data[2], diagnostics_hdr, + sizeof(diagnostics_hdr)) == 0) { + return btusb_intel_diagnostics(hdev, skb); + } } return hci_recv_frame(hdev, skb); @@ -4008,7 +4048,7 @@ static int btusb_probe(struct usb_interface *intf, /* Combined Intel Device setup to support multiple setup routine */ if (id->driver_info & BTUSB_INTEL_COMBINED) { - err = btintel_configure_setup(hdev); + err = btintel_configure_setup(hdev, btusb_driver.name); if (err) goto out_free_dev;