Commit 4c5dae59 authored by Amitkumar Karwar's avatar Amitkumar Karwar Committed by Kalle Valo

mwifiex: add PCIe function level reset support

This patch implements pre and post FLR handlers to support PCIe FLR
functionality. Software cleanup is performed in pre-FLR whereas
firmware is downloaded and software is re-initialised in
post-FLR handler.

Following command triggers FLR.
echo "1" > /sys/bus/pci/devices/$NUMBER/reset

This feature can be used as a recovery mechanism when firmware gets
hang.
Signed-off-by: default avatarAmitkumar Karwar <akarwar@marvell.com>
Signed-off-by: default avatarKalle Valo <kvalo@codeaurora.org>
parent 5251b6be
...@@ -493,9 +493,11 @@ static void mwifiex_free_adapter(struct mwifiex_adapter *adapter) ...@@ -493,9 +493,11 @@ static void mwifiex_free_adapter(struct mwifiex_adapter *adapter)
*/ */
static void mwifiex_terminate_workqueue(struct mwifiex_adapter *adapter) static void mwifiex_terminate_workqueue(struct mwifiex_adapter *adapter)
{ {
if (adapter->workqueue) {
flush_workqueue(adapter->workqueue); flush_workqueue(adapter->workqueue);
destroy_workqueue(adapter->workqueue); destroy_workqueue(adapter->workqueue);
adapter->workqueue = NULL; adapter->workqueue = NULL;
}
if (adapter->rx_workqueue) { if (adapter->rx_workqueue) {
flush_workqueue(adapter->rx_workqueue); flush_workqueue(adapter->rx_workqueue);
...@@ -574,11 +576,14 @@ static void mwifiex_fw_dpc(const struct firmware *firmware, void *context) ...@@ -574,11 +576,14 @@ static void mwifiex_fw_dpc(const struct firmware *firmware, void *context)
} }
priv = adapter->priv[MWIFIEX_BSS_ROLE_STA]; priv = adapter->priv[MWIFIEX_BSS_ROLE_STA];
if (!adapter->wiphy) {
if (mwifiex_register_cfg80211(adapter)) { if (mwifiex_register_cfg80211(adapter)) {
mwifiex_dbg(adapter, ERROR, mwifiex_dbg(adapter, ERROR,
"cannot register with cfg80211\n"); "cannot register with cfg80211\n");
goto err_init_fw; goto err_init_fw;
} }
}
if (mwifiex_init_channel_scan_gap(adapter)) { if (mwifiex_init_channel_scan_gap(adapter)) {
mwifiex_dbg(adapter, ERROR, mwifiex_dbg(adapter, ERROR,
...@@ -671,7 +676,8 @@ static void mwifiex_fw_dpc(const struct firmware *firmware, void *context) ...@@ -671,7 +676,8 @@ static void mwifiex_fw_dpc(const struct firmware *firmware, void *context)
/* /*
* This function initializes the hardware and gets firmware. * This function initializes the hardware and gets firmware.
*/ */
static int mwifiex_init_hw_fw(struct mwifiex_adapter *adapter) static int mwifiex_init_hw_fw(struct mwifiex_adapter *adapter,
bool req_fw_nowait)
{ {
int ret; int ret;
...@@ -686,12 +692,25 @@ static int mwifiex_init_hw_fw(struct mwifiex_adapter *adapter) ...@@ -686,12 +692,25 @@ static int mwifiex_init_hw_fw(struct mwifiex_adapter *adapter)
return -1; return -1;
} }
} }
if (req_fw_nowait) {
ret = request_firmware_nowait(THIS_MODULE, 1, adapter->fw_name, ret = request_firmware_nowait(THIS_MODULE, 1, adapter->fw_name,
adapter->dev, GFP_KERNEL, adapter, adapter->dev, GFP_KERNEL, adapter,
mwifiex_fw_dpc); mwifiex_fw_dpc);
if (ret < 0) if (ret < 0)
mwifiex_dbg(adapter, ERROR, mwifiex_dbg(adapter, ERROR,
"request_firmware_nowait error %d\n", ret); "request_firmware_nowait error %d\n", ret);
} else {
ret = request_firmware(&adapter->firmware,
adapter->fw_name,
adapter->dev);
if (ret < 0)
mwifiex_dbg(adapter, ERROR,
"request_firmware error %d\n", ret);
else
mwifiex_fw_dpc(adapter->firmware, (void *)adapter);
}
return ret; return ret;
} }
...@@ -1340,6 +1359,199 @@ static void mwifiex_main_work_queue(struct work_struct *work) ...@@ -1340,6 +1359,199 @@ static void mwifiex_main_work_queue(struct work_struct *work)
mwifiex_main_process(adapter); mwifiex_main_process(adapter);
} }
/*
* This function gets called during PCIe function level reset. Required
* code is extracted from mwifiex_remove_card()
*/
static int
mwifiex_shutdown_sw(struct mwifiex_adapter *adapter, struct semaphore *sem)
{
struct mwifiex_private *priv;
int i;
if (down_interruptible(sem))
goto exit_sem_err;
if (!adapter)
goto exit_remove;
priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
mwifiex_deauthenticate(priv, NULL);
/* We can no longer handle interrupts once we start doing the teardown
* below.
*/
if (adapter->if_ops.disable_int)
adapter->if_ops.disable_int(adapter);
adapter->surprise_removed = true;
mwifiex_terminate_workqueue(adapter);
/* Stop data */
for (i = 0; i < adapter->priv_num; i++) {
priv = adapter->priv[i];
if (priv && priv->netdev) {
mwifiex_stop_net_dev_queue(priv->netdev, adapter);
if (netif_carrier_ok(priv->netdev))
netif_carrier_off(priv->netdev);
netif_device_detach(priv->netdev);
}
}
mwifiex_dbg(adapter, CMD, "cmd: calling mwifiex_shutdown_drv...\n");
adapter->init_wait_q_woken = false;
if (mwifiex_shutdown_drv(adapter) == -EINPROGRESS)
wait_event_interruptible(adapter->init_wait_q,
adapter->init_wait_q_woken);
if (adapter->if_ops.down_dev)
adapter->if_ops.down_dev(adapter);
mwifiex_dbg(adapter, CMD, "cmd: mwifiex_shutdown_drv done\n");
if (atomic_read(&adapter->rx_pending) ||
atomic_read(&adapter->tx_pending) ||
atomic_read(&adapter->cmd_pending)) {
mwifiex_dbg(adapter, ERROR,
"rx_pending=%d, tx_pending=%d,\t"
"cmd_pending=%d\n",
atomic_read(&adapter->rx_pending),
atomic_read(&adapter->tx_pending),
atomic_read(&adapter->cmd_pending));
}
for (i = 0; i < adapter->priv_num; i++) {
priv = adapter->priv[i];
if (!priv)
continue;
rtnl_lock();
if (priv->netdev &&
priv->wdev.iftype != NL80211_IFTYPE_UNSPECIFIED)
mwifiex_del_virtual_intf(adapter->wiphy, &priv->wdev);
rtnl_unlock();
}
exit_remove:
up(sem);
exit_sem_err:
mwifiex_dbg(adapter, INFO, "%s, successful\n", __func__);
return 0;
}
/* This function gets called during PCIe function level reset. Required
* code is extracted from mwifiex_add_card()
*/
static int
mwifiex_reinit_sw(struct mwifiex_adapter *adapter, struct semaphore *sem,
struct mwifiex_if_ops *if_ops, u8 iface_type)
{
char fw_name[32];
struct pcie_service_card *card = adapter->card;
if (down_interruptible(sem))
goto exit_sem_err;
mwifiex_init_lock_list(adapter);
if (adapter->if_ops.up_dev)
adapter->if_ops.up_dev(adapter);
adapter->iface_type = iface_type;
adapter->card_sem = sem;
adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;
adapter->surprise_removed = false;
init_waitqueue_head(&adapter->init_wait_q);
adapter->is_suspended = false;
adapter->hs_activated = false;
init_waitqueue_head(&adapter->hs_activate_wait_q);
init_waitqueue_head(&adapter->cmd_wait_q.wait);
adapter->cmd_wait_q.status = 0;
adapter->scan_wait_q_woken = false;
if ((num_possible_cpus() > 1) || adapter->iface_type == MWIFIEX_USB)
adapter->rx_work_enabled = true;
adapter->workqueue =
alloc_workqueue("MWIFIEX_WORK_QUEUE",
WQ_HIGHPRI | WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
if (!adapter->workqueue)
goto err_kmalloc;
INIT_WORK(&adapter->main_work, mwifiex_main_work_queue);
if (adapter->rx_work_enabled) {
adapter->rx_workqueue = alloc_workqueue("MWIFIEX_RX_WORK_QUEUE",
WQ_HIGHPRI |
WQ_MEM_RECLAIM |
WQ_UNBOUND, 1);
if (!adapter->rx_workqueue)
goto err_kmalloc;
INIT_WORK(&adapter->rx_work, mwifiex_rx_work_queue);
}
/* Register the device. Fill up the private data structure with
* relevant information from the card. Some code extracted from
* mwifiex_register_dev()
*/
mwifiex_dbg(adapter, INFO, "%s, mwifiex_init_hw_fw()...\n", __func__);
strcpy(fw_name, adapter->fw_name);
strcpy(adapter->fw_name, PCIE8997_DEFAULT_WIFIFW_NAME);
adapter->tx_buf_size = card->pcie.tx_buf_size;
adapter->ext_scan = card->pcie.can_ext_scan;
if (mwifiex_init_hw_fw(adapter, false)) {
strcpy(adapter->fw_name, fw_name);
mwifiex_dbg(adapter, ERROR,
"%s: firmware init failed\n", __func__);
goto err_init_fw;
}
strcpy(adapter->fw_name, fw_name);
mwifiex_dbg(adapter, INFO, "%s, successful\n", __func__);
up(sem);
return 0;
err_init_fw:
mwifiex_dbg(adapter, ERROR, "info: %s: unregister device\n", __func__);
if (adapter->if_ops.unregister_dev)
adapter->if_ops.unregister_dev(adapter);
if (adapter->hw_status == MWIFIEX_HW_STATUS_READY) {
mwifiex_dbg(adapter, ERROR,
"info: %s: shutdown mwifiex\n", __func__);
adapter->init_wait_q_woken = false;
if (mwifiex_shutdown_drv(adapter) == -EINPROGRESS)
wait_event_interruptible(adapter->init_wait_q,
adapter->init_wait_q_woken);
}
err_kmalloc:
mwifiex_terminate_workqueue(adapter);
adapter->surprise_removed = true;
up(sem);
exit_sem_err:
mwifiex_dbg(adapter, INFO, "%s, error\n", __func__);
return -1;
}
/* This function processes pre and post PCIe function level resets.
* It performs software cleanup without touching PCIe specific code.
* Also, during initialization PCIe stuff is skipped.
*/
void mwifiex_do_flr(struct mwifiex_adapter *adapter, bool prepare)
{
struct mwifiex_if_ops if_ops;
if (!prepare) {
mwifiex_reinit_sw(adapter, adapter->card_sem, &if_ops,
adapter->iface_type);
} else {
memcpy(&if_ops, &adapter->if_ops,
sizeof(struct mwifiex_if_ops));
mwifiex_shutdown_sw(adapter, adapter->card_sem);
}
}
EXPORT_SYMBOL_GPL(mwifiex_do_flr);
/* /*
* This function adds the card. * This function adds the card.
* *
...@@ -1411,7 +1623,7 @@ mwifiex_add_card(void *card, struct semaphore *sem, ...@@ -1411,7 +1623,7 @@ mwifiex_add_card(void *card, struct semaphore *sem,
goto err_registerdev; goto err_registerdev;
} }
if (mwifiex_init_hw_fw(adapter)) { if (mwifiex_init_hw_fw(adapter, true)) {
pr_err("%s: firmware init failed\n", __func__); pr_err("%s: firmware init failed\n", __func__);
goto err_init_fw; goto err_init_fw;
} }
......
...@@ -829,6 +829,8 @@ struct mwifiex_if_ops { ...@@ -829,6 +829,8 @@ struct mwifiex_if_ops {
void (*deaggr_pkt)(struct mwifiex_adapter *, struct sk_buff *); void (*deaggr_pkt)(struct mwifiex_adapter *, struct sk_buff *);
void (*multi_port_resync)(struct mwifiex_adapter *); void (*multi_port_resync)(struct mwifiex_adapter *);
bool (*is_port_ready)(struct mwifiex_private *); bool (*is_port_ready)(struct mwifiex_private *);
void (*down_dev)(struct mwifiex_adapter *);
void (*up_dev)(struct mwifiex_adapter *);
}; };
struct mwifiex_adapter { struct mwifiex_adapter {
...@@ -1629,4 +1631,5 @@ void mwifiex_debugfs_remove(void); ...@@ -1629,4 +1631,5 @@ void mwifiex_debugfs_remove(void);
void mwifiex_dev_debugfs_init(struct mwifiex_private *priv); void mwifiex_dev_debugfs_init(struct mwifiex_private *priv);
void mwifiex_dev_debugfs_remove(struct mwifiex_private *priv); void mwifiex_dev_debugfs_remove(struct mwifiex_private *priv);
#endif #endif
void mwifiex_do_flr(struct mwifiex_adapter *adapter, bool prepare);
#endif /* !_MWIFIEX_MAIN_H_ */ #endif /* !_MWIFIEX_MAIN_H_ */
...@@ -277,6 +277,52 @@ static const struct pci_device_id mwifiex_ids[] = { ...@@ -277,6 +277,52 @@ static const struct pci_device_id mwifiex_ids[] = {
MODULE_DEVICE_TABLE(pci, mwifiex_ids); MODULE_DEVICE_TABLE(pci, mwifiex_ids);
static void mwifiex_pcie_reset_notify(struct pci_dev *pdev, bool prepare)
{
struct mwifiex_adapter *adapter;
struct pcie_service_card *card;
if (!pdev) {
pr_err("%s: PCIe device is not specified\n", __func__);
return;
}
card = (struct pcie_service_card *)pci_get_drvdata(pdev);
if (!card || !card->adapter) {
pr_err("%s: Card or adapter structure is not valid (%ld)\n",
__func__, (long)card);
return;
}
adapter = card->adapter;
mwifiex_dbg(adapter, INFO,
"%s: vendor=0x%4.04x device=0x%4.04x rev=%d %s\n",
__func__, pdev->vendor, pdev->device,
pdev->revision,
prepare ? "Pre-FLR" : "Post-FLR");
if (prepare) {
/* Kernel would be performing FLR after this notification.
* Cleanup all software without cleaning anything related to
* PCIe and HW.
*/
mwifiex_do_flr(adapter, prepare);
adapter->surprise_removed = true;
} else {
/* Kernel stores and restores PCIe function context before and
* after performing FLR respectively. Reconfigure the software
* and firmware including firmware redownload
*/
adapter->surprise_removed = false;
mwifiex_do_flr(adapter, prepare);
}
mwifiex_dbg(adapter, INFO, "%s, successful\n", __func__);
}
static const struct pci_error_handlers mwifiex_pcie_err_handler[] = {
{ .reset_notify = mwifiex_pcie_reset_notify, },
};
#ifdef CONFIG_PM_SLEEP #ifdef CONFIG_PM_SLEEP
/* Power Management Hooks */ /* Power Management Hooks */
static SIMPLE_DEV_PM_OPS(mwifiex_pcie_pm_ops, mwifiex_pcie_suspend, static SIMPLE_DEV_PM_OPS(mwifiex_pcie_pm_ops, mwifiex_pcie_suspend,
...@@ -295,6 +341,7 @@ static struct pci_driver __refdata mwifiex_pcie = { ...@@ -295,6 +341,7 @@ static struct pci_driver __refdata mwifiex_pcie = {
}, },
#endif #endif
.shutdown = mwifiex_pcie_shutdown, .shutdown = mwifiex_pcie_shutdown,
.err_handler = mwifiex_pcie_err_handler,
}; };
/* /*
...@@ -2953,7 +3000,6 @@ static int mwifiex_register_dev(struct mwifiex_adapter *adapter) ...@@ -2953,7 +3000,6 @@ static int mwifiex_register_dev(struct mwifiex_adapter *adapter)
static void mwifiex_unregister_dev(struct mwifiex_adapter *adapter) static void mwifiex_unregister_dev(struct mwifiex_adapter *adapter)
{ {
struct pcie_service_card *card = adapter->card; struct pcie_service_card *card = adapter->card;
const struct mwifiex_pcie_card_reg *reg;
struct pci_dev *pdev; struct pci_dev *pdev;
int i; int i;
...@@ -2977,8 +3023,90 @@ static void mwifiex_unregister_dev(struct mwifiex_adapter *adapter) ...@@ -2977,8 +3023,90 @@ static void mwifiex_unregister_dev(struct mwifiex_adapter *adapter)
if (card->msi_enable) if (card->msi_enable)
pci_disable_msi(pdev); pci_disable_msi(pdev);
} }
}
}
/* This function initializes the PCI-E host memory space, WCB rings, etc.
*
* The following initializations steps are followed -
* - Allocate TXBD ring buffers
* - Allocate RXBD ring buffers
* - Allocate event BD ring buffers
* - Allocate command response ring buffer
* - Allocate sleep cookie buffer
* Part of mwifiex_pcie_init(), not reset the PCIE registers
*/
static void mwifiex_pcie_up_dev(struct mwifiex_adapter *adapter)
{
struct pcie_service_card *card = adapter->card;
int ret;
struct pci_dev *pdev = card->dev;
const struct mwifiex_pcie_card_reg *reg = card->pcie.reg;
card->cmdrsp_buf = NULL;
ret = mwifiex_pcie_create_txbd_ring(adapter);
if (ret) {
mwifiex_dbg(adapter, ERROR, "Failed to create txbd ring\n");
goto err_cre_txbd;
}
ret = mwifiex_pcie_create_rxbd_ring(adapter);
if (ret) {
mwifiex_dbg(adapter, ERROR, "Failed to create rxbd ring\n");
goto err_cre_rxbd;
}
ret = mwifiex_pcie_create_evtbd_ring(adapter);
if (ret) {
mwifiex_dbg(adapter, ERROR, "Failed to create evtbd ring\n");
goto err_cre_evtbd;
}
ret = mwifiex_pcie_alloc_cmdrsp_buf(adapter);
if (ret) {
mwifiex_dbg(adapter, ERROR, "Failed to allocate cmdbuf buffer\n");
goto err_alloc_cmdbuf;
}
if (reg->sleep_cookie) {
ret = mwifiex_pcie_alloc_sleep_cookie_buf(adapter);
if (ret) {
mwifiex_dbg(adapter, ERROR, "Failed to allocate sleep_cookie buffer\n");
goto err_alloc_cookie;
}
} else {
card->sleep_cookie_vbase = NULL;
}
return;
err_alloc_cookie:
mwifiex_pcie_delete_cmdrsp_buf(adapter);
err_alloc_cmdbuf:
mwifiex_pcie_delete_evtbd_ring(adapter);
err_cre_evtbd:
mwifiex_pcie_delete_rxbd_ring(adapter);
err_cre_rxbd:
mwifiex_pcie_delete_txbd_ring(adapter);
err_cre_txbd:
pci_iounmap(pdev, card->pci_mmap1);
}
reg = card->pcie.reg; /* This function cleans up the PCI-E host memory space.
* Some code is extracted from mwifiex_unregister_dev()
*
*/
static void mwifiex_pcie_down_dev(struct mwifiex_adapter *adapter)
{
struct pcie_service_card *card = adapter->card;
const struct mwifiex_pcie_card_reg *reg = card->pcie.reg;
if (mwifiex_write_reg(adapter, reg->drv_rdy, 0x00000000))
mwifiex_dbg(adapter, ERROR, "Failed to write driver not-ready signature\n");
adapter->seq_num = 0;
adapter->tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_4K;
if (card) {
if (reg->sleep_cookie) if (reg->sleep_cookie)
mwifiex_pcie_delete_sleep_cookie_buf(adapter); mwifiex_pcie_delete_sleep_cookie_buf(adapter);
...@@ -2988,6 +3116,8 @@ static void mwifiex_unregister_dev(struct mwifiex_adapter *adapter) ...@@ -2988,6 +3116,8 @@ static void mwifiex_unregister_dev(struct mwifiex_adapter *adapter)
mwifiex_pcie_delete_txbd_ring(adapter); mwifiex_pcie_delete_txbd_ring(adapter);
card->cmdrsp_buf = NULL; card->cmdrsp_buf = NULL;
} }
return;
} }
static struct mwifiex_if_ops pcie_ops = { static struct mwifiex_if_ops pcie_ops = {
...@@ -3014,6 +3144,8 @@ static struct mwifiex_if_ops pcie_ops = { ...@@ -3014,6 +3144,8 @@ static struct mwifiex_if_ops pcie_ops = {
.clean_pcie_ring = mwifiex_clean_pcie_ring_buf, .clean_pcie_ring = mwifiex_clean_pcie_ring_buf,
.reg_dump = mwifiex_pcie_reg_dump, .reg_dump = mwifiex_pcie_reg_dump,
.device_dump = mwifiex_pcie_device_dump, .device_dump = mwifiex_pcie_device_dump,
.down_dev = mwifiex_pcie_down_dev,
.up_dev = mwifiex_pcie_up_dev,
}; };
/* /*
......
...@@ -37,6 +37,7 @@ ...@@ -37,6 +37,7 @@
#define PCIEUART8997_FW_NAME_V2 "mrvl/pcieuart8997_combo_v2.bin" #define PCIEUART8997_FW_NAME_V2 "mrvl/pcieuart8997_combo_v2.bin"
#define PCIEUSB8997_FW_NAME_Z "mrvl/pcieusb8997_combo.bin" #define PCIEUSB8997_FW_NAME_Z "mrvl/pcieusb8997_combo.bin"
#define PCIEUSB8997_FW_NAME_V2 "mrvl/pcieusb8997_combo_v2.bin" #define PCIEUSB8997_FW_NAME_V2 "mrvl/pcieusb8997_combo_v2.bin"
#define PCIE8997_DEFAULT_WIFIFW_NAME "mrvl/pcie8997_wlan.bin"
#define PCIE_VENDOR_ID_MARVELL (0x11ab) #define PCIE_VENDOR_ID_MARVELL (0x11ab)
#define PCIE_VENDOR_ID_V2_MARVELL (0x1b4b) #define PCIE_VENDOR_ID_V2_MARVELL (0x1b4b)
......
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