From mboxrd@z Thu Jan 1 00:00:00 1970 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 800CCEB64DD for ; Wed, 5 Jul 2023 16:08:25 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 51C0D10E3B6; Wed, 5 Jul 2023 16:08:25 +0000 (UTC) Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by gabe.freedesktop.org (Postfix) with ESMTPS id 8A32710E3AB for ; Wed, 5 Jul 2023 16:08:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1688573302; x=1720109302; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=IsIjoJEr614Sh645lUr8TlVlXXvK7Ypjyg9gRpSTUwU=; b=Nl2lIypfxT7qLwzQuOEsp7xGmJx4d3XQ1D6+i0dHhBBCx4LzJyZ9D41X VrOkR8HtDsT8COaz6kLnKmLlLxYqrz/uZt5t9qZOmzumuunT3okxvXrKT lQJfDrOmiMe/xNQQZ2bP73L1f2167YY/T1S2tf3MdgbRX7W5Hwap0PC0i Bayouvg7mRrB1sSMYL0rqS2GoE7XBEABcn127oDKFic7P7jU/HamrCT6h NPtqm6mTG0jII1Ln+jgxaQxu0TOUeXzKboC0tBQFBiqDqPuAMwx4wLHA+ Y28PD7S3V4F//oX7BtHY3LO45PphdzDg9NPit+eG9yMCqOayKdb5S1pwQ Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10762"; a="362248933" X-IronPort-AV: E=Sophos;i="6.01,183,1684825200"; d="scan'208";a="362248933" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Jul 2023 09:06:42 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10762"; a="965879869" X-IronPort-AV: E=Sophos;i="6.01,183,1684825200"; d="scan'208";a="965879869" Received: from peterhox-mobl2.ger.corp.intel.com (HELO mwauld-desk1.intel.com) ([10.252.10.156]) by fmsmga006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Jul 2023 09:06:41 -0700 From: Matthew Auld To: intel-xe@lists.freedesktop.org Date: Wed, 5 Jul 2023 17:06:04 +0100 Message-ID: <20230705160602.237213-10-matthew.auld@intel.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230705160602.237213-9-matthew.auld@intel.com> References: <20230705160602.237213-9-matthew.auld@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: [Intel-xe] [PATCH v4 1/7] drm/xe: hold mem_access.ref for CT fast-path X-BeenThere: intel-xe@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Xe graphics driver List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-xe-bounces@lists.freedesktop.org Sender: "Intel-xe" Just checking xe_device_mem_access_ongoing() is not enough, we also need to hold the reference otherwise the ref can transition from 1 -> 0 as we enter g2h_read(), leading to warnings. While we can't do a full rpm sync in the IRQ, we can keep the device awake if the ref is non-zero. Introduce a new helper for this and set it to work in for the CT fast-path. Signed-off-by: Matthew Auld Cc: Matthew Brost Cc: José Roberto de Souza --- drivers/gpu/drm/xe/xe_device.c | 5 +++++ drivers/gpu/drm/xe/xe_device.h | 1 + drivers/gpu/drm/xe/xe_guc_ct.c | 5 ++++- 3 files changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/xe/xe_device.c b/drivers/gpu/drm/xe/xe_device.c index 07ae208af809..94b0089b0dee 100644 --- a/drivers/gpu/drm/xe/xe_device.c +++ b/drivers/gpu/drm/xe/xe_device.c @@ -412,6 +412,11 @@ u32 xe_device_ccs_bytes(struct xe_device *xe, u64 size) DIV_ROUND_UP(size, NUM_BYTES_PER_CCS_BYTE) : 0; } +bool xe_device_mem_access_get_if_ongoing(struct xe_device *xe) +{ + return atomic_inc_not_zero(&xe->mem_access.ref); +} + void xe_device_mem_access_get(struct xe_device *xe) { bool resumed = xe_pm_runtime_resume_if_suspended(xe); diff --git a/drivers/gpu/drm/xe/xe_device.h b/drivers/gpu/drm/xe/xe_device.h index 779f71d066e6..8e01bbadb149 100644 --- a/drivers/gpu/drm/xe/xe_device.h +++ b/drivers/gpu/drm/xe/xe_device.h @@ -138,6 +138,7 @@ static inline struct xe_force_wake * gt_to_fw(struct xe_gt *gt) } void xe_device_mem_access_get(struct xe_device *xe); +bool xe_device_mem_access_get_if_ongoing(struct xe_device *xe); void xe_device_mem_access_put(struct xe_device *xe); static inline bool xe_device_mem_access_ongoing(struct xe_device *xe) diff --git a/drivers/gpu/drm/xe/xe_guc_ct.c b/drivers/gpu/drm/xe/xe_guc_ct.c index 22bc9ce846db..b7aecc480098 100644 --- a/drivers/gpu/drm/xe/xe_guc_ct.c +++ b/drivers/gpu/drm/xe/xe_guc_ct.c @@ -1038,7 +1038,8 @@ void xe_guc_ct_fast_path(struct xe_guc_ct *ct) struct xe_device *xe = ct_to_xe(ct); int len; - if (!xe_device_in_fault_mode(xe) || !xe_device_mem_access_ongoing(xe)) + if (!xe_device_in_fault_mode(xe) || + !xe_device_mem_access_get_if_ongoing(xe)) return; spin_lock(&ct->fast_lock); @@ -1048,6 +1049,8 @@ void xe_guc_ct_fast_path(struct xe_guc_ct *ct) g2h_fast_path(ct, ct->fast_msg, len); } while (len > 0); spin_unlock(&ct->fast_lock); + + xe_device_mem_access_put(xe); } /* Returns less than zero on error, 0 on done, 1 on more available */ -- 2.41.0