From patchwork Tue Sep 6 23:49:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matt Roper X-Patchwork-Id: 12968313 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 43573C38145 for ; Tue, 6 Sep 2022 23:50:31 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0431B10E098; Tue, 6 Sep 2022 23:49:51 +0000 (UTC) Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by gabe.freedesktop.org (Postfix) with ESMTPS id 2177910E086; Tue, 6 Sep 2022 23:49:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1662508186; x=1694044186; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=QP/62W3/f2TqfdCnqaUd57b762HZIJDWu2jZP9nGWjk=; b=Qp5BsgARTHIcWG0L+OpQwB0kCp5gcAypqthQeNLC+++HuMMnPrucfgEF hIbOV4xtbl8QfCLYquLf8Hr56D23W7rHAI8ZdJ8pwRRnXMjKMjhDnC/6e wmxXEVpt646IQyV3WgBAPrb55mGSboR87jOK1F6g6gIVgDUWufMrL6ZsY gak3qFfTHG1ceyUkgsbnGESL8hgSTPVodC2S5yPRvjMD91eUZ11znt2kf 7rpF2L8BptCr3aofeI4+E/FA3bNOTnpeduVX5KGF71jk68RoWw3lS0xmG WLY8KfJqh60DdXZ53sYOUZFqgMZo7sIEAV2ScYImB9dhxeOQc4dDqE5ht A==; X-IronPort-AV: E=McAfee;i="6500,9779,10462"; a="298053140" X-IronPort-AV: E=Sophos;i="5.93,295,1654585200"; d="scan'208";a="298053140" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Sep 2022 16:49:45 -0700 X-IronPort-AV: E=Sophos;i="5.93,295,1654585200"; d="scan'208";a="675920306" Received: from mdroper-desk1.fm.intel.com ([10.1.27.134]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Sep 2022 16:49:45 -0700 From: Matt Roper To: intel-gfx@lists.freedesktop.org Subject: [PATCH v3 01/14] drm/i915: Move locking and unclaimed check into mmio_debug_{suspend, resume} Date: Tue, 6 Sep 2022 16:49:21 -0700 Message-Id: <20220906234934.3655440-2-matthew.d.roper@intel.com> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220906234934.3655440-1-matthew.d.roper@intel.com> References: <20220906234934.3655440-1-matthew.d.roper@intel.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: dri-devel@lists.freedesktop.org, Radhakrishna Sripada Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Moving the locking for MMIO debug (and the final check for unclaimed accesses when resuming debug after a userspace-initiated forcewake) will make it simpler to completely skip MMIO debug handling on uncores that don't support it in future patches. Signed-off-by: Matt Roper Reviewed-by: Radhakrishna Sripada --- drivers/gpu/drm/i915/intel_uncore.c | 41 +++++++++++++++-------------- 1 file changed, 21 insertions(+), 20 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c index 9b81b2543ce2..e717ea55484a 100644 --- a/drivers/gpu/drm/i915/intel_uncore.c +++ b/drivers/gpu/drm/i915/intel_uncore.c @@ -50,23 +50,33 @@ intel_uncore_mmio_debug_init_early(struct intel_uncore_mmio_debug *mmio_debug) mmio_debug->unclaimed_mmio_check = 1; } -static void mmio_debug_suspend(struct intel_uncore_mmio_debug *mmio_debug) +static void mmio_debug_suspend(struct intel_uncore *uncore) { - lockdep_assert_held(&mmio_debug->lock); + spin_lock(&uncore->debug->lock); /* Save and disable mmio debugging for the user bypass */ - if (!mmio_debug->suspend_count++) { - mmio_debug->saved_mmio_check = mmio_debug->unclaimed_mmio_check; - mmio_debug->unclaimed_mmio_check = 0; + if (!uncore->debug->suspend_count++) { + uncore->debug->saved_mmio_check = uncore->debug->unclaimed_mmio_check; + uncore->debug->unclaimed_mmio_check = 0; } + + spin_unlock(&uncore->debug->lock); } -static void mmio_debug_resume(struct intel_uncore_mmio_debug *mmio_debug) +static bool check_for_unclaimed_mmio(struct intel_uncore *uncore); + +static void mmio_debug_resume(struct intel_uncore *uncore) { - lockdep_assert_held(&mmio_debug->lock); + spin_lock(&uncore->debug->lock); + + if (!--uncore->debug->suspend_count) + uncore->debug->unclaimed_mmio_check = uncore->debug->saved_mmio_check; - if (!--mmio_debug->suspend_count) - mmio_debug->unclaimed_mmio_check = mmio_debug->saved_mmio_check; + if (check_for_unclaimed_mmio(uncore)) + drm_info(&uncore->i915->drm, + "Invalid mmio detected during user access\n"); + + spin_unlock(&uncore->debug->lock); } static const char * const forcewake_domain_names[] = { @@ -677,9 +687,7 @@ void intel_uncore_forcewake_user_get(struct intel_uncore *uncore) spin_lock_irq(&uncore->lock); if (!uncore->user_forcewake_count++) { intel_uncore_forcewake_get__locked(uncore, FORCEWAKE_ALL); - spin_lock(&uncore->debug->lock); - mmio_debug_suspend(uncore->debug); - spin_unlock(&uncore->debug->lock); + mmio_debug_suspend(uncore); } spin_unlock_irq(&uncore->lock); } @@ -695,14 +703,7 @@ void intel_uncore_forcewake_user_put(struct intel_uncore *uncore) { spin_lock_irq(&uncore->lock); if (!--uncore->user_forcewake_count) { - spin_lock(&uncore->debug->lock); - mmio_debug_resume(uncore->debug); - - if (check_for_unclaimed_mmio(uncore)) - drm_info(&uncore->i915->drm, - "Invalid mmio detected during user access\n"); - spin_unlock(&uncore->debug->lock); - + mmio_debug_resume(uncore); intel_uncore_forcewake_put__locked(uncore, FORCEWAKE_ALL); } spin_unlock_irq(&uncore->lock);