From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from alexa-out.qualcomm.com ([129.46.98.28]:59744 "EHLO alexa-out.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752527AbdLLTEO (ORCPT ); Tue, 12 Dec 2017 14:04:14 -0500 From: Maya Erez To: Kalle Valo Cc: Maya Erez , linux-wireless@vger.kernel.org, wil6210@qca.qualcomm.com Subject: [PATCH 5/9] wil6210: prevent parallel suspend and dump collection Date: Tue, 12 Dec 2017 21:03:58 +0200 Message-Id: <1513105442-28041-6-git-send-email-qca_merez@qca.qualcomm.com> (sfid-20171212_200421_403559_DF0386CD) In-Reply-To: <1513105442-28041-1-git-send-email-qca_merez@qca.qualcomm.com> References: <1513105442-28041-1-git-send-email-qca_merez@qca.qualcomm.com> Sender: linux-wireless-owner@vger.kernel.org List-ID: Suspend and crash dump operations can happen simultaneously in case there is a FW assert during the suspend procedure or when SSR calls all the devices crashdump callbacks. To prevent that, a new flag is added, indicating that the dumps collection is in progress, in order to allow the suspend/reset decline if the dumps collection already started. Signed-off-by: Maya Erez --- drivers/net/wireless/ath/wil6210/main.c | 33 +++++++++++++++++------ drivers/net/wireless/ath/wil6210/pm.c | 17 ++++++++++++ drivers/net/wireless/ath/wil6210/wil6210.h | 1 + drivers/net/wireless/ath/wil6210/wil_crash_dump.c | 11 ++++++++ 4 files changed, 54 insertions(+), 8 deletions(-) diff --git a/drivers/net/wireless/ath/wil6210/main.c b/drivers/net/wireless/ath/wil6210/main.c index 7a8f8c2..aa6f9c4 100644 --- a/drivers/net/wireless/ath/wil6210/main.c +++ b/drivers/net/wireless/ath/wil6210/main.c @@ -998,6 +998,7 @@ static void wil_pre_fw_config(struct wil6210_priv *wil) int wil_reset(struct wil6210_priv *wil, bool load_fw) { int rc; + unsigned long status_flags = BIT(wil_status_resetting); wil_dbg_misc(wil, "reset\n"); @@ -1037,6 +1038,14 @@ int wil_reset(struct wil6210_priv *wil, bool load_fw) } set_bit(wil_status_resetting, wil->status); + if (test_bit(wil_status_collecting_dumps, wil->status)) { + /* Device collects crash dump, cancel the reset. + * following crash dump collection, reset would take place. + */ + wil_dbg_misc(wil, "reject reset while collecting crash dump\n"); + rc = -EBUSY; + goto out; + } cancel_work_sync(&wil->disconnect_worker); wil6210_disconnect(wil, NULL, WLAN_REASON_DEAUTH_LEAVING, false); @@ -1051,7 +1060,11 @@ int wil_reset(struct wil6210_priv *wil, bool load_fw) /* prevent NAPI from being scheduled and prevent wmi commands */ mutex_lock(&wil->wmi_mutex); - bitmap_zero(wil->status, wil_status_last); + if (test_bit(wil_status_suspending, wil->status)) + status_flags |= BIT(wil_status_suspending); + bitmap_and(wil->status, wil->status, &status_flags, + wil_status_last); + wil_dbg_misc(wil, "wil->status (0x%lx)\n", *wil->status); mutex_unlock(&wil->wmi_mutex); wil_mask_irq(wil); @@ -1069,14 +1082,14 @@ int wil_reset(struct wil6210_priv *wil, bool load_fw) wil_rx_fini(wil); if (rc) { wil_bl_crash_info(wil, true); - return rc; + goto out; } rc = wil_get_bl_info(wil); if (rc == -EAGAIN && !load_fw) /* ignore RF error if not going up */ rc = 0; if (rc) - return rc; + goto out; wil_set_oob_mode(wil, oob_mode); if (load_fw) { @@ -1088,10 +1101,10 @@ int wil_reset(struct wil6210_priv *wil, bool load_fw) /* Loading f/w from the file */ rc = wil_request_firmware(wil, wil->wil_fw_name, true); if (rc) - return rc; + goto out; rc = wil_request_firmware(wil, WIL_BOARD_FILE_NAME, true); if (rc) - return rc; + goto out; wil_pre_fw_config(wil); wil_release_cpu(wil); @@ -1103,6 +1116,8 @@ int wil_reset(struct wil6210_priv *wil, bool load_fw) reinit_completion(&wil->wmi_call); reinit_completion(&wil->halp.comp); + clear_bit(wil_status_resetting, wil->status); + if (load_fw) { wil_configure_interrupt_moderation(wil); wil_unmask_irq(wil); @@ -1136,6 +1151,10 @@ int wil_reset(struct wil6210_priv *wil, bool load_fw) } return rc; + +out: + clear_bit(wil_status_resetting, wil->status); + return rc; } void wil_fw_error_recovery(struct wil6210_priv *wil) @@ -1241,9 +1260,7 @@ int __wil_down(struct wil6210_priv *wil) wil_abort_scan(wil, false); mutex_unlock(&wil->p2p_wdev_mutex); - wil_reset(wil, false); - - return 0; + return wil_reset(wil, false); } int wil_down(struct wil6210_priv *wil) diff --git a/drivers/net/wireless/ath/wil6210/pm.c b/drivers/net/wireless/ath/wil6210/pm.c index 056b180..0a96518 100644 --- a/drivers/net/wireless/ath/wil6210/pm.c +++ b/drivers/net/wireless/ath/wil6210/pm.c @@ -145,6 +145,13 @@ static int wil_suspend_keep_radio_on(struct wil6210_priv *wil) /* Prevent handling of new tx and wmi commands */ set_bit(wil_status_suspending, wil->status); + if (test_bit(wil_status_collecting_dumps, wil->status)) { + /* Device collects crash dump, cancel the suspend */ + wil_dbg_pm(wil, "reject suspend while collecting crash dump\n"); + clear_bit(wil_status_suspending, wil->status); + wil->suspend_stats.rejected_by_host++; + return -EBUSY; + } wil_update_net_queues_bh(wil, NULL, true); if (!wil_is_tx_idle(wil)) { @@ -255,6 +262,15 @@ static int wil_suspend_radio_off(struct wil6210_priv *wil) wil_dbg_pm(wil, "suspend radio off\n"); + set_bit(wil_status_suspending, wil->status); + if (test_bit(wil_status_collecting_dumps, wil->status)) { + /* Device collects crash dump, cancel the suspend */ + wil_dbg_pm(wil, "reject suspend while collecting crash dump\n"); + clear_bit(wil_status_suspending, wil->status); + wil->suspend_stats.rejected_by_host++; + return -EBUSY; + } + /* if netif up, hardware is alive, shut it down */ if (ndev->flags & IFF_UP) { rc = wil_down(wil); @@ -281,6 +297,7 @@ static int wil_suspend_radio_off(struct wil6210_priv *wil) set_bit(wil_status_suspended, wil->status); out: + clear_bit(wil_status_suspending, wil->status); wil_dbg_pm(wil, "suspend radio off: %d\n", rc); return rc; diff --git a/drivers/net/wireless/ath/wil6210/wil6210.h b/drivers/net/wireless/ath/wil6210/wil6210.h index f2bb55e..ca5abbd 100644 --- a/drivers/net/wireless/ath/wil6210/wil6210.h +++ b/drivers/net/wireless/ath/wil6210/wil6210.h @@ -445,6 +445,7 @@ enum { /* for wil6210_priv.status */ wil_status_suspending, /* suspend in progress */ wil_status_suspended, /* suspend completed, device is suspended */ wil_status_resuming, /* resume in progress */ + wil_status_collecting_dumps, /* crashdump collection in progress */ wil_status_last /* keep last */ }; diff --git a/drivers/net/wireless/ath/wil6210/wil_crash_dump.c b/drivers/net/wireless/ath/wil6210/wil_crash_dump.c index e53cf0c..1ed3306 100644 --- a/drivers/net/wireless/ath/wil6210/wil_crash_dump.c +++ b/drivers/net/wireless/ath/wil6210/wil_crash_dump.c @@ -72,6 +72,15 @@ int wil_fw_copy_crash_dump(struct wil6210_priv *wil, void *dest, u32 size) return -EINVAL; } + set_bit(wil_status_collecting_dumps, wil->status); + if (test_bit(wil_status_suspending, wil->status) || + test_bit(wil_status_suspended, wil->status) || + test_bit(wil_status_resetting, wil->status)) { + wil_err(wil, "cannot collect fw dump during suspend/reset\n"); + clear_bit(wil_status_collecting_dumps, wil->status); + return -EINVAL; + } + /* copy to crash dump area */ for (i = 0; i < ARRAY_SIZE(fw_mapping); i++) { map = &fw_mapping[i]; @@ -91,6 +100,8 @@ int wil_fw_copy_crash_dump(struct wil6210_priv *wil, void *dest, u32 size) (const void __iomem * __force)data, len); } + clear_bit(wil_status_collecting_dumps, wil->status); + return 0; } -- 1.9.1