From patchwork Tue Mar 28 16:42:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manish Mandlik X-Patchwork-Id: 667967 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 851E4C6FD18 for ; Tue, 28 Mar 2023 16:42:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229986AbjC1Qmw (ORCPT ); Tue, 28 Mar 2023 12:42:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53596 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229783AbjC1Qmt (ORCPT ); Tue, 28 Mar 2023 12:42:49 -0400 Received: from mail-pl1-x64a.google.com (mail-pl1-x64a.google.com [IPv6:2607:f8b0:4864:20::64a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CBFB5976A for ; Tue, 28 Mar 2023 09:42:43 -0700 (PDT) Received: by mail-pl1-x64a.google.com with SMTP id x4-20020a170902ec8400b001a1a5f6f272so7913162plg.1 for ; Tue, 28 Mar 2023 09:42:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; t=1680021763; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=5VKvgGWZGaiHsmGfZk5Wg1RcI5NhE9DQQixPHeF5hYY=; b=ZlwJhIbVbso71yiZtb7YeU7gJ6VR0SvCYAtbxdkCtLbvrQh/8/auw0jRTnXlYWInpw Y8YDjuh7zsjw4FqqfQ458CHW07PyQPEG5gOwGKs2SRHaBt4PjIh1RyqILeMnCa3mFzke KtocscTQRTN02KQMU0ghKqNXmKMAVH+BDHFkz/Yza3tHB2APm8nRd912vf9l5OES4MKN P58BHYiSml65Qb0eU8z0tCJ5pOz+zLZ5sZK/n/UZVg5f5e4fGiJAyMeXD/tC4pgMHVwN 75XRz7lPH9LHu8qbxBPRdrEca4BeHjTOVE8ol5u999Pwi0YwpX5CdUMYv5XPUETNk86d UtHw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1680021763; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=5VKvgGWZGaiHsmGfZk5Wg1RcI5NhE9DQQixPHeF5hYY=; b=tPG2a/1g3U5MA8RS7TZ5/6h1U8dOlokLNJDQUdgLIECMRMG7oe0pUs1haOKs2rUCLO 7uj0cUHe0FQLEBJ0LEXj+4Ezbp8gpAbJPmoLIOab7ZYTc8SV9IV3VFGdzJmvYWYKbD1h id2kXvZPQGXZqdUzeL99Okif1ffB0boJWqHftrde0gzWDvUd3PBNM85rwEKM1hLRU9rW 10CEVp2Vweu0KVEYjm/VPB5bXOzlfo7hNO68wArr5bGVAYP0Ysjey1uHZrvbJcavoVeP K3B/CvD5saWISk8wFrT0N0NLh23+ibmEDd1PDK94BGmF9yM0EK1IoU4cPbadoRUnTtUd E50A== X-Gm-Message-State: AO0yUKUEBmjkQDoHbXvCdW3IgYzfC6PwGLsQkPiy6dve78A9GfyClBzI dQ0rIUroxH9vvcKgZJG1Owgt9nXNmKg+KA== X-Google-Smtp-Source: AK7set9aml2SnzXWefYaYI/pd+4ybDb98A1UKPDNB/Uho+bRMdk2BJVUb1Ux6H1LY1RiA6Big4fmAqicjm+L3A== X-Received: from mmandlik-cloudtop.c.googlers.com ([fda3:e722:ac3:cc00:24:72f4:c0a8:2893]) (user=mmandlik job=sendgmr) by 2002:a05:6a00:4510:b0:626:1710:9b7d with SMTP id cw16-20020a056a00451000b0062617109b7dmr9726619pfb.0.1680021762979; Tue, 28 Mar 2023 09:42:42 -0700 (PDT) Date: Tue, 28 Mar 2023 09:42:37 -0700 Mime-Version: 1.0 X-Mailer: git-send-email 2.40.0.348.gf938b09366-goog Message-ID: <20230328094207.v11.1.I9b4e4818bab450657b19cda3497d363c9baa616e@changeid> Subject: [PATCH v11 1/4] Bluetooth: Add support for hci devcoredump From: Manish Mandlik To: marcel@holtmann.org, luiz.dentz@gmail.com Cc: chromeos-bluetooth-upstreaming@chromium.org, linux-bluetooth@vger.kernel.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 v11: - Fix formatting/indentation Changes in v10: - Fix compiler warnings Changes in v9: - Use scnprintf instead of snprintf - Remove unnecessary out-of-memory logs - Add a function for each devcoredump state - Use skb_pull_data whenever possible - Rename hci_devcoredump_*() to hci_devcd_*() 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 v5: - No changes in v5 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 | 112 +++++++ include/net/bluetooth/hci_core.h | 14 + net/bluetooth/Makefile | 2 + net/bluetooth/coredump.c | 525 +++++++++++++++++++++++++++++++ net/bluetooth/hci_core.c | 1 + net/bluetooth/hci_sync.c | 2 + 6 files changed, 656 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..331e27e3f24c --- /dev/null +++ b/include/net/bluetooth/coredump.h @@ -0,0 +1,112 @@ +/* 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_devcd_reset(struct hci_dev *hdev); +void hci_devcd_rx(struct work_struct *work); +void hci_devcd_timeout(struct work_struct *work); + +int hci_devcd_register(struct hci_dev *hdev, coredump_t coredump, + dmp_hdr_t dmp_hdr, notify_change_t notify_change); +int hci_devcd_init(struct hci_dev *hdev, u32 dump_size); +int hci_devcd_append(struct hci_dev *hdev, struct sk_buff *skb); +int hci_devcd_append_pattern(struct hci_dev *hdev, u8 pattern, u32 len); +int hci_devcd_complete(struct hci_dev *hdev); +int hci_devcd_abort(struct hci_dev *hdev); + +#else + +static inline void hci_devcd_reset(struct hci_dev *hdev) {} +static inline void hci_devcd_rx(struct work_struct *work) {} +static inline void hci_devcd_timeout(struct work_struct *work) {} + +static inline int hci_devcd_register(struct hci_dev *hdev, coredump_t coredump, + dmp_hdr_t dmp_hdr, + notify_change_t notify_change) +{ + return -EOPNOTSUPP; +} + +static inline int hci_devcd_init(struct hci_dev *hdev, u32 dump_size) +{ + return -EOPNOTSUPP; +} + +static inline int hci_devcd_append(struct hci_dev *hdev, struct sk_buff *skb) +{ + return -EOPNOTSUPP; +} + +static inline int hci_devcd_append_pattern(struct hci_dev *hdev, + u8 pattern, u32 len) +{ + return -EOPNOTSUPP; +} + +static inline int hci_devcd_complete(struct hci_dev *hdev) +{ + return -EOPNOTSUPP; +} + +static inline int hci_devcd_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..300aaac84adf 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_devcd_setup(struct hci_dev *hdev) +{ +#ifdef CONFIG_DEV_COREDUMP + INIT_WORK(&hdev->dump.dump_rx, hci_devcd_rx); + INIT_DELAYED_WORK(&hdev->dump.dump_timeout, hci_devcd_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..fb5545c16636 --- /dev/null +++ b/net/bluetooth/coredump.c @@ -0,0 +1,525 @@ +// 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 DBG_UNEXPECTED_STATE() \ + bt_dev_dbg(hdev, \ + "Unexpected packet (%d) for state (%d). ", \ + hci_dmp_cb(skb)->pkt_type, hdev->dump.state) + +#define MAX_DEVCOREDUMP_HDR_SIZE 512 /* bytes */ + +static int hci_devcd_update_hdr_state(char *buf, size_t size, int state) +{ + int len = 0; + + if (!buf) + return 0; + + len = scnprintf(buf, size, "Bluetooth devcoredump\nState: %d\n", state); + + return len + 1; /* scnprintf adds \0 at the end upon state rewrite */ +} + +/* Call with hci_dev_lock only. */ +static int hci_devcd_update_state(struct hci_dev *hdev, int state) +{ + bt_dev_dbg(hdev, "Updating devcoredump state from %d to %d.", + hdev->dump.state, state); + + hdev->dump.state = state; + + return hci_devcd_update_hdr_state(hdev->dump.head, + hdev->dump.alloc_size, state); +} + +static int hci_devcd_mkheader(struct hci_dev *hdev, struct sk_buff *skb) +{ + char dump_start[] = "--- Start dump ---\n"; + char hdr[80]; + int hdr_len; + + hdr_len = hci_devcd_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_devcd_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_devcd_reset(struct hci_dev *hdev) +{ + hdev->dump.head = NULL; + hdev->dump.tail = NULL; + hdev->dump.alloc_size = 0; + + hci_devcd_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_devcd_free(struct hci_dev *hdev) +{ + if (hdev->dump.head) + vfree(hdev->dump.head); + + hci_devcd_reset(hdev); +} + +/* Call with hci_dev_lock only. */ +static int hci_devcd_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_devcd_update_state(hdev, HCI_DEVCOREDUMP_IDLE); + + return 0; +} + +/* Call with hci_dev_lock only. */ +static bool hci_devcd_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_devcd_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_devcd_prepare(struct hci_dev *hdev, u32 dump_size) +{ + struct sk_buff *skb; + int dump_hdr_size; + int err = 0; + + skb = alloc_skb(MAX_DEVCOREDUMP_HDR_SIZE, GFP_ATOMIC); + if (!skb) + return -ENOMEM; + + dump_hdr_size = hci_devcd_mkheader(hdev, skb); + + if (hci_devcd_alloc(hdev, dump_hdr_size + dump_size)) { + err = -ENOMEM; + goto hdr_free; + } + + /* Insert the device header */ + if (!hci_devcd_copy(hdev, skb->data, skb->len)) { + bt_dev_err(hdev, "Failed to insert header"); + hci_devcd_free(hdev); + + err = -ENOMEM; + goto hdr_free; + } + +hdr_free: + kfree_skb(skb); + + return err; +} + +static void hci_devcd_handle_pkt_init(struct hci_dev *hdev, struct sk_buff *skb) +{ + u32 *dump_size; + + if (hdev->dump.state != HCI_DEVCOREDUMP_IDLE) { + DBG_UNEXPECTED_STATE(); + return; + } + + if (skb->len != sizeof(*dump_size)) { + bt_dev_dbg(hdev, "Invalid dump init pkt"); + return; + } + + dump_size = skb_pull_data(skb, sizeof(*dump_size)); + if (!*dump_size) { + bt_dev_err(hdev, "Zero size dump init pkt"); + return; + } + + if (hci_devcd_prepare(hdev, *dump_size)) { + bt_dev_err(hdev, "Failed to prepare for dump"); + return; + } + + hci_devcd_update_state(hdev, HCI_DEVCOREDUMP_ACTIVE); + queue_delayed_work(hdev->workqueue, &hdev->dump.dump_timeout, + DEVCOREDUMP_TIMEOUT); +} + +static void hci_devcd_handle_pkt_skb(struct hci_dev *hdev, struct sk_buff *skb) +{ + if (hdev->dump.state != HCI_DEVCOREDUMP_ACTIVE) { + DBG_UNEXPECTED_STATE(); + return; + } + + if (!hci_devcd_copy(hdev, skb->data, skb->len)) + bt_dev_dbg(hdev, "Failed to insert skb"); +} + +static void hci_devcd_handle_pkt_pattern(struct hci_dev *hdev, + struct sk_buff *skb) +{ + struct hci_devcoredump_skb_pattern *pattern; + + if (hdev->dump.state != HCI_DEVCOREDUMP_ACTIVE) { + DBG_UNEXPECTED_STATE(); + return; + } + + if (skb->len != sizeof(*pattern)) { + bt_dev_dbg(hdev, "Invalid pattern skb"); + return; + } + + pattern = skb_pull_data(skb, sizeof(*pattern)); + + if (!hci_devcd_memset(hdev, pattern->pattern, pattern->len)) + bt_dev_dbg(hdev, "Failed to set pattern"); +} + +static void hci_devcd_handle_pkt_complete(struct hci_dev *hdev, + struct sk_buff *skb) +{ + u32 dump_size; + + if (hdev->dump.state != HCI_DEVCOREDUMP_ACTIVE) { + DBG_UNEXPECTED_STATE(); + return; + } + + hci_devcd_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); +} + +static void hci_devcd_handle_pkt_abort(struct hci_dev *hdev, + struct sk_buff *skb) +{ + u32 dump_size; + + if (hdev->dump.state != HCI_DEVCOREDUMP_ACTIVE) { + DBG_UNEXPECTED_STATE(); + return; + } + + hci_devcd_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); +} + +/* 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_devcd_init(). Once active, the driver + * can append data using hci_devcd_append() or insert a pattern + * using hci_devcd_append_pattern(). + * + * HCI_DEVCOREDUMP_DONE: Once the dump collection is complete, the drive + * can signal the completion using hci_devcd_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_devcd_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_devcd_register() before using the hci + * devcoredump APIs. + */ +void hci_devcd_rx(struct work_struct *work) +{ + struct hci_dev *hdev = container_of(work, struct hci_dev, dump.dump_rx); + struct sk_buff *skb; + int start_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: + hci_devcd_handle_pkt_init(hdev, skb); + break; + + case HCI_DEVCOREDUMP_PKT_SKB: + hci_devcd_handle_pkt_skb(hdev, skb); + break; + + case HCI_DEVCOREDUMP_PKT_PATTERN: + hci_devcd_handle_pkt_pattern(hdev, skb); + break; + + case HCI_DEVCOREDUMP_PKT_COMPLETE: + hci_devcd_handle_pkt_complete(hdev, skb); + break; + + case HCI_DEVCOREDUMP_PKT_ABORT: + hci_devcd_handle_pkt_abort(hdev, skb); + break; + + default: + bt_dev_dbg(hdev, "Unknown packet (%d) for state (%d). ", + hci_dmp_cb(skb)->pkt_type, hdev->dump.state); + break; + } + + hci_dev_unlock(hdev); + kfree_skb(skb); + + /* Notify the driver about any state changes before resetting + * the state machine + */ + if (start_state != hdev->dump.state) + hci_devcd_notify(hdev, hdev->dump.state); + + /* Reset the state machine if the devcoredump is complete */ + hci_dev_lock(hdev); + if (hdev->dump.state == HCI_DEVCOREDUMP_DONE || + hdev->dump.state == HCI_DEVCOREDUMP_ABORT) + hci_devcd_reset(hdev); + hci_dev_unlock(hdev); + } +} +EXPORT_SYMBOL(hci_devcd_rx); + +void hci_devcd_timeout(struct work_struct *work) +{ + struct hci_dev *hdev = container_of(work, struct hci_dev, + dump.dump_timeout.work); + u32 dump_size; + + hci_devcd_notify(hdev, HCI_DEVCOREDUMP_TIMEOUT); + + hci_dev_lock(hdev); + + cancel_work_sync(&hdev->dump.dump_rx); + + hci_devcd_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_devcd_reset(hdev); + + hci_dev_unlock(hdev); +} +EXPORT_SYMBOL(hci_devcd_timeout); + +int hci_devcd_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_devcd_register); + +static inline bool hci_devcd_enabled(struct hci_dev *hdev) +{ + return hdev->dump.supported; +} + +int hci_devcd_init(struct hci_dev *hdev, u32 dump_size) +{ + struct sk_buff *skb; + + if (!hci_devcd_enabled(hdev)) + return -EOPNOTSUPP; + + skb = alloc_skb(sizeof(dump_size), GFP_ATOMIC); + if (!skb) + return -ENOMEM; + + hci_dmp_cb(skb)->pkt_type = HCI_DEVCOREDUMP_PKT_INIT; + skb_put_data(skb, &dump_size, sizeof(dump_size)); + + skb_queue_tail(&hdev->dump.dump_q, skb); + queue_work(hdev->workqueue, &hdev->dump.dump_rx); + + return 0; +} +EXPORT_SYMBOL(hci_devcd_init); + +int hci_devcd_append(struct hci_dev *hdev, struct sk_buff *skb) +{ + if (!skb) + return -ENOMEM; + + if (!hci_devcd_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_devcd_append); + +int hci_devcd_append_pattern(struct hci_dev *hdev, u8 pattern, u32 len) +{ + struct hci_devcoredump_skb_pattern p; + struct sk_buff *skb; + + if (!hci_devcd_enabled(hdev)) + return -EOPNOTSUPP; + + skb = alloc_skb(sizeof(p), GFP_ATOMIC); + if (!skb) + 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_devcd_append_pattern); + +int hci_devcd_complete(struct hci_dev *hdev) +{ + struct sk_buff *skb; + + if (!hci_devcd_enabled(hdev)) + return -EOPNOTSUPP; + + skb = alloc_skb(0, GFP_ATOMIC); + if (!skb) + 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_devcd_complete); + +int hci_devcd_abort(struct hci_dev *hdev) +{ + struct sk_buff *skb; + + if (!hci_devcd_enabled(hdev)) + return -EOPNOTSUPP; + + skb = alloc_skb(0, GFP_ATOMIC); + if (!skb) + 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_devcd_abort); diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index 334e308451f5..393b317ae68f 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_devcd_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..2448423912fd 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_devcd_reset(hdev); + set_bit(HCI_RUNNING, &hdev->flags); hci_sock_dev_event(hdev, HCI_DEV_OPEN); From patchwork Tue Mar 28 16:42:38 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manish Mandlik X-Patchwork-Id: 668308 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 87D3EC761AF for ; Tue, 28 Mar 2023 16:42:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229806AbjC1Qmt (ORCPT ); Tue, 28 Mar 2023 12:42:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53570 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229589AbjC1Qmr (ORCPT ); Tue, 28 Mar 2023 12:42:47 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 522BD9778 for ; Tue, 28 Mar 2023 09:42:45 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id e186-20020a2537c3000000b00b72501acf50so12689297yba.20 for ; Tue, 28 Mar 2023 09:42:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; t=1680021764; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=sVqYiqqONgJinnmUNat86CZDMiZZiJLuOgYyNlqZ0G4=; b=YzSg/dxn12AXMZGR4PZHWXYmubtTWVftbnNXFSbaOpsDfG2DswYExmXfmFLbRqvM3k tlFsIKs369BYwzvWnxdg27fVO0TR37LvM6aog8UdLoMcHpgzt4+A4FB9kQ4AHAfHFCNE TqSJKXH2rHeqhvWalOlQFVZ0adddTg+WdIQ/ZeE1wxStTCGa3z/hIoPQmwHJntsDAtTU NKxGnVXPTLInviqdQ1qIFbAs/yyapWInkSHMXWowYSMCF7GHGRCrej+Tu9Z59/XPtWRg 10INxw77xWiAsOCg9ZtkWKWt4VMaMrBtHS+t3UZCUGOQ+lH5A8GtAjLnbwlDLevatcAE Mtuw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1680021764; 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=sVqYiqqONgJinnmUNat86CZDMiZZiJLuOgYyNlqZ0G4=; b=SR1/7xQ2LDLQwG/TkrmxK5Fy+nPPkO5sHuPkfxXyEoAGUq5XlMT6uqV6nLZwJqCCuV xXB3qfmCFr2YXM7nX92Q2SemSHfeWt/9iZv20JNS6VWFQU9kLoPFfLG6AjoVUMx8biIe 2WRubKUrBpaSMJT8I9Lu93afeZRDSUEsjPfcd5nT85keee05PNS7z89Ilq8PG8c0tK/d hhz1QQ0u7v9CzCSjdoD1DZB/EDxe6Hd1B2+qYWUj84kKvuO8pQi5e96uDh4XyqlxO3UG M4QwPcdO1QyWlzrWnO3NlPCrPoZFd1iT5L8I7ERhRTSyx9g7DOXyNqt/2gWgmldivsL0 JrnQ== X-Gm-Message-State: AAQBX9e4W5UOpv++xdxRn4EGN6DU4hBsp22HV2/6QGQcHOuk9PjJyw4h IX7hudWKCQqru53MzI4f4bWw/XZmwArtOg== X-Google-Smtp-Source: AKy350ZdF5XB6NGqz4AFBj0o9/gHdRDuFwjjD5sa8NXdDLsWlwsAh8BmUU/+FdYpZNwctVLYwkKI8mynGHsVSw== X-Received: from mmandlik-cloudtop.c.googlers.com ([fda3:e722:ac3:cc00:24:72f4:c0a8:2893]) (user=mmandlik job=sendgmr) by 2002:a81:b65f:0:b0:545:611c:8d19 with SMTP id h31-20020a81b65f000000b00545611c8d19mr7765281ywk.4.1680021764629; Tue, 28 Mar 2023 09:42:44 -0700 (PDT) Date: Tue, 28 Mar 2023 09:42:38 -0700 In-Reply-To: <20230328094207.v11.1.I9b4e4818bab450657b19cda3497d363c9baa616e@changeid> Mime-Version: 1.0 References: <20230328094207.v11.1.I9b4e4818bab450657b19cda3497d363c9baa616e@changeid> X-Mailer: git-send-email 2.40.0.348.gf938b09366-goog Message-ID: <20230328094207.v11.2.Ief9a81a3643d2291f6db2b3695c3a6e0159467dc@changeid> Subject: [PATCH v11 2/4] Bluetooth: Add vhci devcoredump support From: Manish Mandlik To: marcel@holtmann.org, luiz.dentz@gmail.com Cc: chromeos-bluetooth-upstreaming@chromium.org, linux-bluetooth@vger.kernel.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 --- (no changes since v9) Changes in v9: - Rename hci_devcoredump_*() to hci_devcd_*() 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..a265dcaf8275 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_devcd_register(hdev, vhci_coredump, vhci_coredump_hdr, NULL); + + ret = hci_devcd_init(hdev, skb->len); + if (ret) { + BT_ERR("Failed to generate devcoredump"); + kfree_skb(skb); + return ret; + } + + hci_devcd_append(hdev, skb); + hci_devcd_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 Tue Mar 28 16:42:39 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manish Mandlik X-Patchwork-Id: 667968 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 A5751C77B61 for ; Tue, 28 Mar 2023 16:42:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229866AbjC1Qmv (ORCPT ); Tue, 28 Mar 2023 12:42:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53590 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229752AbjC1Qms (ORCPT ); Tue, 28 Mar 2023 12:42:48 -0400 Received: from mail-yw1-x114a.google.com (mail-yw1-x114a.google.com [IPv6:2607:f8b0:4864:20::114a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 152043C1D for ; Tue, 28 Mar 2023 09:42:47 -0700 (PDT) Received: by mail-yw1-x114a.google.com with SMTP id 00721157ae682-536cb268ab8so126654757b3.17 for ; Tue, 28 Mar 2023 09:42:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; t=1680021766; 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=akG81if4jTiA5YzyK2S4GHzKQoAhTTq+47u+UaQ/VHIofm3zkprIOu6B7rYPy0tSyl UGUGltoHlgfE+76EaGusuobGe+lom/TQ52hOMw/twnoJxK9R3Yk/6h0k5KShhzn3To8f gYW0DhK35mOjv7aS7au1ZBOmUGhsI6ryXgzUQYQSSm2PKV33DE23sYJc2rioXGa0MsUY f/EJgHP565/cUHbq1M1UoGXALU239pGH/qxEiGJK7Z/1A+/+hbZwROBWpoYZqp3UBI9A T7Drp3G2KX0M/LyhaAJvdq2xc5i4v2uGrjOj3YHmEBie7OApXYb1qHy/IfIxxHduKF8+ EmfA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1680021766; 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=nATuSCqOcgupJmPJPk6+sQFiEHxTMKokrJ1716azQgmfWfgTdb07Gza2fLhqGUkdPp yglj+qnIRTk1zuIVT56nxcHP0xsuRclguYZSTpDNvL6RCgZs5PL9FIqocX3Qb8MQ++cf gGbdQQpOPX2S4fk7JNfhNQsjMRgZ9Kne1pVjaxMHS7KneLZHVuW25SkXP4Zrj6Lw5JML /XkpmPrpDmiiwbr6C2j+emdckeIDyMHoVKYiY2+OGMojpADgpecQqBHUM1oAmjKx8jCC A87e1GpJr3oHjF6R6qHlhT0tHnREIVfBElcM3K7jVbTEktfTHbaJfJHW4YV4vHOpwA/N qvuw== X-Gm-Message-State: AAQBX9edf9aC68WHh0etT7j6dD6oddAhcZgj452zWs6MJUxIhhPNfRT6 AF5yYPQOgZvDN42UXhjNT2r+QgQTLmtpPw== X-Google-Smtp-Source: AKy350bR6rJxmGAjFwURfQiBKLRMeY2B+66CwIhzIMLLr9+9B8WExIll1C/vuZ6mOLKs6yawoneAG/tQ3CHasw== X-Received: from mmandlik-cloudtop.c.googlers.com ([fda3:e722:ac3:cc00:24:72f4:c0a8:2893]) (user=mmandlik job=sendgmr) by 2002:a81:ac46:0:b0:533:9185:fc2c with SMTP id z6-20020a81ac46000000b005339185fc2cmr7783218ywj.7.1680021766358; Tue, 28 Mar 2023 09:42:46 -0700 (PDT) Date: Tue, 28 Mar 2023 09:42:39 -0700 In-Reply-To: <20230328094207.v11.1.I9b4e4818bab450657b19cda3497d363c9baa616e@changeid> Mime-Version: 1.0 References: <20230328094207.v11.1.I9b4e4818bab450657b19cda3497d363c9baa616e@changeid> X-Mailer: git-send-email 2.40.0.348.gf938b09366-goog Message-ID: <20230328094207.v11.3.I8cd97c192e8268567b6f467ccd993ec71897318e@changeid> Subject: [PATCH v11 3/4] Bluetooth: btusb: Add btusb devcoredump support From: Manish Mandlik To: marcel@holtmann.org, luiz.dentz@gmail.com Cc: chromeos-bluetooth-upstreaming@chromium.org, linux-bluetooth@vger.kernel.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 Tue Mar 28 16:42:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manish Mandlik X-Patchwork-Id: 668307 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 E1843C761AF for ; Tue, 28 Mar 2023 16:42:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230010AbjC1Qmy (ORCPT ); Tue, 28 Mar 2023 12:42:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53632 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229511AbjC1Qmt (ORCPT ); Tue, 28 Mar 2023 12:42:49 -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 298A99778 for ; Tue, 28 Mar 2023 09:42:48 -0700 (PDT) Received: by mail-pj1-x1049.google.com with SMTP id kx3-20020a17090b228300b0023cfd09ed94so6362004pjb.4 for ; Tue, 28 Mar 2023 09:42:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; t=1680021767; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=HdWPjBXZOPMosgtbDYXpGuXQ6q7Yes9wR9g9zEmd0+Y=; b=HlBDeeT1ONCzYw1LrVcVYcPpPt4dF4Sr9mJbwtYzA2MSd2/twyCPId0SuMop5+l3pR 3GdCVmj0tkOexZlAn+8RQH9JVVpCDe/FM8geU5CBp1roWj7h1jKAzDZo9op0TNMLOA4k 2aUQkNqDwBlRPZN3PamWWDf8YV/zr6V+vb2dYaptMl+7OWAhkUM5KpTXfVwWPBJMKs7C agppolWLYj5UanLMQZfi3yzryOMndm+YyzC6AeCLYCKWetiQ86ur3CoMyWkAU+O4dBhQ pPDz1xyLMrsWgFp6HOUVrXT0Ee6aenbhMVI3c6Q3i7frgtH7umX8yOHsBCFgKcB5b0r2 Jhjg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1680021767; 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=HdWPjBXZOPMosgtbDYXpGuXQ6q7Yes9wR9g9zEmd0+Y=; b=wlcInZCuo9FGWHw5g9jcpHGCh6eELmxmGNm46Rs2vOYVgjGY4IpIuPXD1x1VPeZXtb EwaCd2kP4lb6u5EEluZr/L6m9wYAvkfLmOSypTcUtAUb7S/w1H5Um33JJNJ8x5afRWYr TalhnNAZG76zhVUJ7GKQ5VvkvbSkz1IhV6VxP02LDMmmeo0P4m4+K9DrycE5AVL3ci99 Zm5Z119tqxDNnrtQERN24nw2Z0EwBu/iBpjP4cXFzNs40rKYHz2kab0/kdkxtKH9djtX Pckgfm/jGcr3p5jt6KiUSVBw9ulj/ZaPj0K68FPT8QXMa11w1DwRdAGiauLDgkT8+3Pa FtvQ== X-Gm-Message-State: AAQBX9eTU0zMAWQzroBScfv2QEE3HnX1mKHC0Yo1T75EL7z2LcVsfztC aq6gKcdkyqSzF/bNC84mxi/DhIXZMZO+hA== X-Google-Smtp-Source: AKy350a2BJKM+HS/RpoHGuy53nUJ/pAEreGKvMGFHp5z3PLURyjnWmffXt2dwfsIwsK2xL6uEP8d1xyeyjtSoQ== X-Received: from mmandlik-cloudtop.c.googlers.com ([fda3:e722:ac3:cc00:24:72f4:c0a8:2893]) (user=mmandlik job=sendgmr) by 2002:a05:6a00:1995:b0:626:2638:5a51 with SMTP id d21-20020a056a00199500b0062626385a51mr8475768pfl.5.1680021767742; Tue, 28 Mar 2023 09:42:47 -0700 (PDT) Date: Tue, 28 Mar 2023 09:42:40 -0700 In-Reply-To: <20230328094207.v11.1.I9b4e4818bab450657b19cda3497d363c9baa616e@changeid> Mime-Version: 1.0 References: <20230328094207.v11.1.I9b4e4818bab450657b19cda3497d363c9baa616e@changeid> X-Mailer: git-send-email 2.40.0.348.gf938b09366-goog Message-ID: <20230328094207.v11.4.I8ac78c64382c66cdb49076a2053ef9c44ebf1ea3@changeid> Subject: [PATCH v11 4/4] Bluetooth: btintel: Add Intel devcoredump support From: Manish Mandlik To: marcel@holtmann.org, luiz.dentz@gmail.com Cc: chromeos-bluetooth-upstreaming@chromium.org, linux-bluetooth@vger.kernel.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 --- (no changes since v9) Changes in v9: - Rename hci_devcoredump_*() to hci_devcd_*() 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..19698d5c3c1c 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_devcd_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..414426314600 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_devcd_init(hdev, skb->len)) { + hci_devcd_append(hdev, skb); + hci_devcd_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;