From patchwork Tue Nov 12 12:12:26 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mika Kuoppala X-Patchwork-Id: 3171951 Return-Path: X-Original-To: patchwork-intel-gfx@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 87CDDC045B for ; Tue, 12 Nov 2013 12:25:09 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id D7A3520347 for ; Tue, 12 Nov 2013 12:25:04 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id 92E9920266 for ; Tue, 12 Nov 2013 12:25:03 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 01702FA954; Tue, 12 Nov 2013 04:25:00 -0800 (PST) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by gabe.freedesktop.org (Postfix) with ESMTP id 93680FA954 for ; Tue, 12 Nov 2013 04:24:58 -0800 (PST) Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga101.fm.intel.com with ESMTP; 12 Nov 2013 04:24:57 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.93,684,1378882800"; d="scan'208";a="431978572" Received: from rosetta.fi.intel.com (HELO rosetta) ([10.237.72.60]) by fmsmga002.fm.intel.com with ESMTP; 12 Nov 2013 04:24:56 -0800 Received: by rosetta (Postfix, from userid 1000) id 9826A80070; Tue, 12 Nov 2013 14:12:27 +0200 (EET) From: Mika Kuoppala To: intel-gfx@lists.freedesktop.org Date: Tue, 12 Nov 2013 14:12:26 +0200 Message-Id: <1384258346-16042-1-git-send-email-mika.kuoppala@intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: References: Cc: miku@iki.fi Subject: [Intel-gfx] [PATCH 1/2] drm/i915: add i915_reset_count X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.13 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: intel-gfx-bounces@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP reset_counter will be incremented twice per successful reset. Odd values mean reset is in progress and even values mean that reset has completed. Reset status ioctl introduced in following commit needs to deliver global reset count to userspace so use reset_counter to derive the actual reset count for the gpu Note that reset in progress is enough to increment the counter. v2: wedged equals reset in progress (Daniel Vetter) v3: Fixed stale comments (Damien Lespiau) Signed-off-by: Mika Kuoppala Reviewed-by: Damien Lespiau --- drivers/gpu/drm/i915/i915_drv.h | 43 ++++++++++++++++++++------------------- drivers/gpu/drm/i915/i915_irq.c | 2 +- 2 files changed, 23 insertions(+), 22 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index c546316..4c0f751 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1069,34 +1069,30 @@ struct i915_gpu_error { unsigned long missed_irq_rings; /** - * State variable and reset counter controlling the reset flow + * State variable controlling the reset flow and count * - * Upper bits are for the reset counter. This counter is used by the - * wait_seqno code to race-free noticed that a reset event happened and - * that it needs to restart the entire ioctl (since most likely the - * seqno it waited for won't ever signal anytime soon). + * This is a counter which gets incremented when reset is triggered, + * and again when reset has been handled. So odd values (lowest bit set) + * means that reset is in progress and even values that + * (reset_counter >> 1):th reset was successfully completed. + * + * If reset is not completed succesfully, the I915_WEDGE bit is + * set meaning that hardware is terminally sour and there is no + * recovery. All waiters on the reset_queue will be woken when + * that happens. + * + * This counter is used by the wait_seqno code to notice that reset + * event happened and it needs to restart the entire ioctl (since most + * likely the seqno it waited for won't ever signal anytime soon). * * This is important for lock-free wait paths, where no contended lock * naturally enforces the correct ordering between the bail-out of the * waiter and the gpu reset work code. - * - * Lowest bit controls the reset state machine: Set means a reset is in - * progress. This state will (presuming we don't have any bugs) decay - * into either unset (successful reset) or the special WEDGED value (hw - * terminally sour). All waiters on the reset_queue will be woken when - * that happens. */ atomic_t reset_counter; - /** - * Special values/flags for reset_counter - * - * Note that the code relies on - * I915_WEDGED & I915_RESET_IN_PROGRESS_FLAG - * being true. - */ #define I915_RESET_IN_PROGRESS_FLAG 1 -#define I915_WEDGED 0xffffffff +#define I915_WEDGED (1 << 31) /** * Waitqueue to signal when the reset has completed. Used by clients @@ -2046,12 +2042,17 @@ int __must_check i915_gem_check_wedge(struct i915_gpu_error *error, static inline bool i915_reset_in_progress(struct i915_gpu_error *error) { return unlikely(atomic_read(&error->reset_counter) - & I915_RESET_IN_PROGRESS_FLAG); + & (I915_RESET_IN_PROGRESS_FLAG | I915_WEDGED)); } static inline bool i915_terminally_wedged(struct i915_gpu_error *error) { - return atomic_read(&error->reset_counter) == I915_WEDGED; + return atomic_read(&error->reset_counter) & I915_WEDGED; +} + +static inline u32 i915_reset_count(struct i915_gpu_error *error) +{ + return ((atomic_read(&error->reset_counter) & ~I915_WEDGED) + 1) / 2; } void i915_gem_reset(struct drm_device *dev); diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index e14285b..19949e8 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -1781,7 +1781,7 @@ static void i915_error_work_func(struct work_struct *work) kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, reset_done_event); } else { - atomic_set(&error->reset_counter, I915_WEDGED); + atomic_set_mask(I915_WEDGED, &error->reset_counter); } /*