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Bluetooth: hci_qca: Collect controller memory dump during SSR

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We will collect the ramdump of BT controller when hardware error event
received before rebooting the HCI layer. Before restarting a subsystem
or a process running on a subsystem, it is often required to request
either a subsystem or a process to perform proper cache dump and
software failure reason into a memory buffer which application
processor can retrieve afterwards. SW developers can often provide
initial investigation by looking into that debugging information.

Signed-off-by: Balakrishna Godavarthi <bgodavar@codeaurora.org>
Signed-off-by: Venkata Lakshmi Narayana Gubba <gubbaven@codeaurora.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Balakrishna Godavarthi 2020-01-02 20:19:11 +05:30 committed by Marcel Holtmann
parent e601daed27
commit d841502c79
1 changed files with 291 additions and 5 deletions
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296
drivers/bluetooth/hci_qca.c
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@ -20,6 +20,7 @@
#include <linux/completion.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/devcoredump.h>
#include <linux/device.h>
#include <linux/gpio/consumer.h>
#include <linux/mod_devicetable.h>
@ -46,6 +47,7 @@
#define IBS_BTSOC_TX_IDLE_TIMEOUT_MS 40
#define IBS_HOST_TX_IDLE_TIMEOUT_MS 2000
#define CMD_TRANS_TIMEOUT_MS 100
#define MEMDUMP_TIMEOUT_MS 8000
/* susclk rate */
#define SUSCLK_RATE_32KHZ 32768
@ -53,12 +55,21 @@
/* Controller debug log header */
#define QCA_DEBUG_HANDLE 0x2EDC
/* Controller dump header */
#define QCA_SSR_DUMP_HANDLE 0x0108
#define QCA_DUMP_PACKET_SIZE 255
#define QCA_LAST_SEQUENCE_NUM 0xFFFF
#define QCA_CRASHBYTE_PACKET_LEN 1096
#define QCA_MEMDUMP_BYTE 0xFB
enum qca_flags {
QCA_IBS_ENABLED,
QCA_DROP_VENDOR_EVENT,
QCA_SUSPENDING,
QCA_MEMDUMP_COLLECTION
};
/* HCI_IBS transmit side sleep protocol states */
enum tx_ibs_states {
HCI_IBS_TX_ASLEEP,
@ -81,11 +92,40 @@ enum hci_ibs_clock_state_vote {
HCI_IBS_RX_VOTE_CLOCK_OFF,
};
/* Controller memory dump states */
enum qca_memdump_states {
QCA_MEMDUMP_IDLE,
QCA_MEMDUMP_COLLECTING,
QCA_MEMDUMP_COLLECTED,
QCA_MEMDUMP_TIMEOUT,
};
struct qca_memdump_data {
char *memdump_buf_head;
char *memdump_buf_tail;
u32 current_seq_no;
u32 received_dump;
};
struct qca_memdump_event_hdr {
__u8 evt;
__u8 plen;
__u16 opcode;
__u16 seq_no;
__u8 reserved;
} __packed;
struct qca_dump_size {
u32 dump_size;
} __packed;
struct qca_data {
struct hci_uart *hu;
struct sk_buff *rx_skb;
struct sk_buff_head txq;
struct sk_buff_head tx_wait_q; /* HCI_IBS wait queue */
struct sk_buff_head rx_memdump_q; /* Memdump wait queue */
spinlock_t hci_ibs_lock; /* HCI_IBS state lock */
u8 tx_ibs_state; /* HCI_IBS transmit side power state*/
u8 rx_ibs_state; /* HCI_IBS receive side power state */
@ -95,14 +135,18 @@ struct qca_data {
u32 tx_idle_delay;
struct timer_list wake_retrans_timer;
u32 wake_retrans;
struct timer_list memdump_timer;
struct workqueue_struct *workqueue;
struct work_struct ws_awake_rx;
struct work_struct ws_awake_device;
struct work_struct ws_rx_vote_off;
struct work_struct ws_tx_vote_off;
struct work_struct ctrl_memdump_evt;
struct qca_memdump_data *qca_memdump;
unsigned long flags;
struct completion drop_ev_comp;
wait_queue_head_t suspend_wait_q;
enum qca_memdump_states memdump_state;
/* For debugging purpose */
u64 ibs_sent_wacks;
@ -167,6 +211,7 @@ static int qca_regulator_enable(struct qca_serdev *qcadev);
static void qca_regulator_disable(struct qca_serdev *qcadev);
static void qca_power_shutdown(struct hci_uart *hu);
static int qca_power_off(struct hci_dev *hdev);
static void qca_controller_memdump(struct work_struct *work);
static enum qca_btsoc_type qca_soc_type(struct hci_uart *hu)
{
@ -474,6 +519,23 @@ static void hci_ibs_wake_retrans_timeout(struct timer_list *t)
hci_uart_tx_wakeup(hu);
}
static void hci_memdump_timeout(struct timer_list *t)
{
struct qca_data *qca = from_timer(qca, t, tx_idle_timer);
struct hci_uart *hu = qca->hu;
struct qca_memdump_data *qca_memdump = qca->qca_memdump;
char *memdump_buf = qca_memdump->memdump_buf_tail;
bt_dev_err(hu->hdev, "clearing allocated memory due to memdump timeout");
/* Inject hw error event to reset the device and driver. */
hci_reset_dev(hu->hdev);
kfree(memdump_buf);
kfree(qca_memdump);
qca->memdump_state = QCA_MEMDUMP_TIMEOUT;
del_timer(&qca->memdump_timer);
cancel_work_sync(&qca->ctrl_memdump_evt);
}
/* Initialize protocol */
static int qca_open(struct hci_uart *hu)
{
@ -492,6 +554,7 @@ static int qca_open(struct hci_uart *hu)
skb_queue_head_init(&qca->txq);
skb_queue_head_init(&qca->tx_wait_q);
skb_queue_head_init(&qca->rx_memdump_q);
spin_lock_init(&qca->hci_ibs_lock);
qca->workqueue = alloc_ordered_workqueue("qca_wq", 0);
if (!qca->workqueue) {
@ -504,7 +567,7 @@ static int qca_open(struct hci_uart *hu)
INIT_WORK(&qca->ws_awake_device, qca_wq_awake_device);
INIT_WORK(&qca->ws_rx_vote_off, qca_wq_serial_rx_clock_vote_off);
INIT_WORK(&qca->ws_tx_vote_off, qca_wq_serial_tx_clock_vote_off);
INIT_WORK(&qca->ctrl_memdump_evt, qca_controller_memdump);
init_waitqueue_head(&qca->suspend_wait_q);
qca->hu = hu;
@ -544,6 +607,7 @@ static int qca_open(struct hci_uart *hu)
timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0);
qca->tx_idle_delay = IBS_HOST_TX_IDLE_TIMEOUT_MS;
timer_setup(&qca->memdump_timer, hci_memdump_timeout, 0);
BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u",
qca->tx_idle_delay, qca->wake_retrans);
@ -622,8 +686,10 @@ static int qca_close(struct hci_uart *hu)
skb_queue_purge(&qca->tx_wait_q);
skb_queue_purge(&qca->txq);
skb_queue_purge(&qca->rx_memdump_q);
del_timer(&qca->tx_idle_timer);
del_timer(&qca->wake_retrans_timer);
del_timer(&qca->memdump_timer);
destroy_workqueue(qca->workqueue);
qca->hu = NULL;
@ -900,6 +966,126 @@ static int qca_recv_acl_data(struct hci_dev *hdev, struct sk_buff *skb)
return hci_recv_frame(hdev, skb);
}
static void qca_controller_memdump(struct work_struct *work)
{
struct qca_data *qca = container_of(work, struct qca_data,
ctrl_memdump_evt);
struct hci_uart *hu = qca->hu;
struct sk_buff *skb;
struct qca_memdump_event_hdr *cmd_hdr;
struct qca_memdump_data *qca_memdump = qca->qca_memdump;
struct qca_dump_size *dump;
char *memdump_buf;
char nullBuff[QCA_DUMP_PACKET_SIZE] = { 0 };
u16 opcode, seq_no;
u32 dump_size;
while ((skb = skb_dequeue(&qca->rx_memdump_q))) {
if (!qca_memdump) {
qca_memdump = kzalloc(sizeof(struct qca_memdump_data),
GFP_ATOMIC);
if (!qca_memdump)
return;
qca->qca_memdump = qca_memdump;
}
qca->memdump_state = QCA_MEMDUMP_COLLECTING;
cmd_hdr = (void *) skb->data;
opcode = __le16_to_cpu(cmd_hdr->opcode);
seq_no = __le16_to_cpu(cmd_hdr->seq_no);
skb_pull(skb, sizeof(struct qca_memdump_event_hdr));
if (!seq_no) {
/* This is the first frame of memdump packet from
* the controller, Disable IBS to recevie dump
* with out any interruption, ideally time required for
* the controller to send the dump is 8 seconds. let us
* start timer to handle this asynchronous activity.
*/
clear_bit(QCA_IBS_ENABLED, &qca->flags);
set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
dump = (void *) skb->data;
dump_size = __le32_to_cpu(dump->dump_size);
if (!(dump_size)) {
bt_dev_err(hu->hdev, "Rx invalid memdump size");
kfree_skb(skb);
return;
}
bt_dev_info(hu->hdev, "QCA collecting dump of size:%u",
dump_size);
mod_timer(&qca->memdump_timer, (jiffies +
msecs_to_jiffies(MEMDUMP_TIMEOUT_MS)));
skb_pull(skb, sizeof(dump_size));
memdump_buf = vmalloc(dump_size);
qca_memdump->memdump_buf_head = memdump_buf;
qca_memdump->memdump_buf_tail = memdump_buf;
}
memdump_buf = qca_memdump->memdump_buf_tail;
/* If sequence no 0 is missed then there is no point in
* accepting the other sequences.
*/
if (!memdump_buf) {
bt_dev_err(hu->hdev, "QCA: Discarding other packets");
kfree(qca_memdump);
kfree_skb(skb);
qca->qca_memdump = NULL;
return;
}
/* There could be chance of missing some packets from
* the controller. In such cases let us store the dummy
* packets in the buffer.
*/
while ((seq_no > qca_memdump->current_seq_no + 1) &&
seq_no != QCA_LAST_SEQUENCE_NUM) {
bt_dev_err(hu->hdev, "QCA controller missed packet:%d",
qca_memdump->current_seq_no);
memcpy(memdump_buf, nullBuff, QCA_DUMP_PACKET_SIZE);
memdump_buf = memdump_buf + QCA_DUMP_PACKET_SIZE;
qca_memdump->received_dump += QCA_DUMP_PACKET_SIZE;
qca_memdump->current_seq_no++;
}
memcpy(memdump_buf, (unsigned char *) skb->data, skb->len);
memdump_buf = memdump_buf + skb->len;
qca_memdump->memdump_buf_tail = memdump_buf;
qca_memdump->current_seq_no = seq_no + 1;
qca_memdump->received_dump += skb->len;
qca->qca_memdump = qca_memdump;
kfree_skb(skb);
if (seq_no == QCA_LAST_SEQUENCE_NUM) {
bt_dev_info(hu->hdev, "QCA writing crash dump of size %d bytes",
qca_memdump->received_dump);
memdump_buf = qca_memdump->memdump_buf_head;
dev_coredumpv(&hu->serdev->dev, memdump_buf,
qca_memdump->received_dump, GFP_KERNEL);
del_timer(&qca->memdump_timer);
kfree(qca->qca_memdump);
qca->qca_memdump = NULL;
qca->memdump_state = QCA_MEMDUMP_COLLECTED;
}
}
}
int qca_controller_memdump_event(struct hci_dev *hdev, struct sk_buff *skb)
{
struct hci_uart *hu = hci_get_drvdata(hdev);
struct qca_data *qca = hu->priv;
skb_queue_tail(&qca->rx_memdump_q, skb);
queue_work(qca->workqueue, &qca->ctrl_memdump_evt);
return 0;
}
static int qca_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
{
struct hci_uart *hu = hci_get_drvdata(hdev);
@ -925,6 +1111,14 @@ static int qca_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
return 0;
}
/* We receive chip memory dump as an event packet, With a dedicated
* handler followed by a hardware error event. When this event is
* received we store dump into a file before closing hci. This
* dump will help in triaging the issues.
*/
if ((skb->data[0] == HCI_VENDOR_PKT) &&
(get_unaligned_be16(skb->data + 2) == QCA_SSR_DUMP_HANDLE))
return qca_controller_memdump_event(hdev, skb);
return hci_recv_frame(hdev, skb);
}
@ -1203,6 +1397,91 @@ static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
return ret;
}
static int qca_send_crashbuffer(struct hci_uart *hu)
{
struct qca_data *qca = hu->priv;
struct sk_buff *skb;
skb = bt_skb_alloc(QCA_CRASHBYTE_PACKET_LEN, GFP_KERNEL);
if (!skb) {
bt_dev_err(hu->hdev, "Failed to allocate memory for skb packet");
return -ENOMEM;
}
/* We forcefully crash the controller, by sending 0xfb byte for
* 1024 times. We also might have chance of losing data, To be
* on safer side we send 1096 bytes to the SoC.
*/
memset(skb_put(skb, QCA_CRASHBYTE_PACKET_LEN), QCA_MEMDUMP_BYTE,
QCA_CRASHBYTE_PACKET_LEN);
hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
bt_dev_info(hu->hdev, "crash the soc to collect controller dump");
skb_queue_tail(&qca->txq, skb);
hci_uart_tx_wakeup(hu);
return 0;
}
static void qca_wait_for_dump_collection(struct hci_dev *hdev)
{
struct hci_uart *hu = hci_get_drvdata(hdev);
struct qca_data *qca = hu->priv;
struct qca_memdump_data *qca_memdump = qca->qca_memdump;
char *memdump_buf = NULL;
wait_on_bit_timeout(&qca->flags, QCA_MEMDUMP_COLLECTION,
TASK_UNINTERRUPTIBLE, MEMDUMP_TIMEOUT_MS);
clear_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
if (qca->memdump_state == QCA_MEMDUMP_IDLE) {
bt_dev_err(hu->hdev, "Clearing the buffers due to timeout");
if (qca_memdump)
memdump_buf = qca_memdump->memdump_buf_tail;
kfree(memdump_buf);
kfree(qca_memdump);
qca->memdump_state = QCA_MEMDUMP_TIMEOUT;
del_timer(&qca->memdump_timer);
cancel_work_sync(&qca->ctrl_memdump_evt);
}
}
static void qca_hw_error(struct hci_dev *hdev, u8 code)
{
struct hci_uart *hu = hci_get_drvdata(hdev);
struct qca_data *qca = hu->priv;
bt_dev_info(hdev, "mem_dump_status: %d", qca->memdump_state);
if (qca->memdump_state == QCA_MEMDUMP_IDLE) {
/* If hardware error event received for other than QCA
* soc memory dump event, then we need to crash the SOC
* and wait here for 8 seconds to get the dump packets.
* This will block main thread to be on hold until we
* collect dump.
*/
set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
qca_send_crashbuffer(hu);
qca_wait_for_dump_collection(hdev);
} else if (qca->memdump_state == QCA_MEMDUMP_COLLECTING) {
/* Let us wait here until memory dump collected or
* memory dump timer expired.
*/
bt_dev_info(hdev, "waiting for dump to complete");
qca_wait_for_dump_collection(hdev);
}
}
static void qca_cmd_timeout(struct hci_dev *hdev)
{
struct hci_uart *hu = hci_get_drvdata(hdev);
struct qca_data *qca = hu->priv;
if (qca->memdump_state == QCA_MEMDUMP_IDLE)
qca_send_crashbuffer(hu);
else
bt_dev_info(hdev, "Dump collection is in process");
}
static int qca_wcn3990_init(struct hci_uart *hu)
{
struct qca_serdev *qcadev;
@ -1320,6 +1599,8 @@ static int qca_setup(struct hci_uart *hu)
if (!ret) {
set_bit(QCA_IBS_ENABLED, &qca->flags);
qca_debugfs_init(hdev);
hu->hdev->hw_error = qca_hw_error;
hu->hdev->cmd_timeout = qca_cmd_timeout;
} else if (ret == -ENOENT) {
/* No patch/nvm-config found, run with original fw/config */
ret = 0;
@ -1408,17 +1689,22 @@ static void qca_power_shutdown(struct hci_uart *hu)
host_set_baudrate(hu, 2400);
qca_send_power_pulse(hu, false);
qca_regulator_disable(qcadev);
hu->hdev->hw_error = NULL;
hu->hdev->cmd_timeout = NULL;
}
static int qca_power_off(struct hci_dev *hdev)
{
struct hci_uart *hu = hci_get_drvdata(hdev);
struct qca_data *qca = hu->priv;
/* Perform pre shutdown command */
qca_send_pre_shutdown_cmd(hdev);
usleep_range(8000, 10000);
/* Stop sending shutdown command if soc crashes. */
if (qca->memdump_state == QCA_MEMDUMP_IDLE) {
qca_send_pre_shutdown_cmd(hdev);
usleep_range(8000, 10000);
}
qca->memdump_state = QCA_MEMDUMP_IDLE;
qca_power_shutdown(hu);
return 0;
}