From patchwork Thu Dec 21 03:20:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Randy Dunlap X-Patchwork-Id: 13500962 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 81038C3DA6E for ; Thu, 21 Dec 2023 03:20:50 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id E174B10E650; Thu, 21 Dec 2023 03:20:38 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) by gabe.freedesktop.org (Postfix) with ESMTPS id 1097E10E64D; Thu, 21 Dec 2023 03:20:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:Message-ID:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type: Content-ID:Content-Description:In-Reply-To:References; bh=LiVIYSg1d+XSLTzB95bVtSsjQGpYCfcFa5dzKpB5Uj4=; b=I1yRndFgN+zphoGvwhDB3IzZdG sembhqwncaGz6jTurdlnfvi9oMSUqRQ/0zY9uoQkzolU2ayQehNbqUf4tfwe85RTzI4tF+YhzNa3s QQSfCTGmTMMXyq++4G8pKEqbbBI0uI2MmDyIvvddCri2l9W99TnDUlchOB5bK02GgPZ5P0AGl8DrF 2mf3rZJHisB/ZvV6yo5w4K+e4QtQoaD3rIa+D2AZJq3HS3dtNCs00Nmckkdf7qO0bvEzeB4Lxmmsx COkFYe10Un078vXDxMhzZ2eNrG8ZH4ZoxlvS3imTNTtOzCv2G6vJrpcl3ffoK2ZLJxC9e2Bp9CY5Q yVoBIE/w==; Received: from [50.53.46.231] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1rG9bq-001aN9-0v; Thu, 21 Dec 2023 03:20:30 +0000 From: Randy Dunlap To: linux-kernel@vger.kernel.org Subject: [PATCH 1/4] drm/i915/gem: reconcile Excess struct member kernel-doc warnings Date: Wed, 20 Dec 2023 19:20:26 -0800 Message-ID: <20231221032029.30942-1-rdunlap@infradead.org> X-Mailer: git-send-email 2.43.0 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: Tvrtko Ursulin , Randy Dunlap , Jonathan Corbet , intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Rodrigo Vivi Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Document nested struct members with full names as described in Documentation/doc-guide/kernel-doc.rst. i915_gem_context_types.h:420: warning: Excess struct member 'lock' description in 'i915_gem_context' Signed-off-by: Randy Dunlap Cc: Jani Nikula Cc: Joonas Lahtinen Cc: Rodrigo Vivi Cc: Tvrtko Ursulin Cc: intel-gfx@lists.freedesktop.org Cc: Jonathan Corbet Cc: dri-devel@lists.freedesktop.org --- drivers/gpu/drm/i915/gem/i915_gem_context_types.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff -- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h --- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h @@ -412,9 +412,9 @@ struct i915_gem_context { /** @stale: tracks stale engines to be destroyed */ struct { - /** @lock: guards engines */ + /** @stale.lock: guards engines */ spinlock_t lock; - /** @engines: list of stale engines */ + /** @stale.engines: list of stale engines */ struct list_head engines; } stale; }; From patchwork Thu Dec 21 03:20:27 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Randy Dunlap X-Patchwork-Id: 13500960 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 DEA26C3DA6E for ; Thu, 21 Dec 2023 03:20:44 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 5309510E64D; Thu, 21 Dec 2023 03:20:37 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) by gabe.freedesktop.org (Postfix) with ESMTPS id E07AD10E643; Thu, 21 Dec 2023 03:20:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=uNEK+CxMh6qX0p3sx3zeo+Q9G/JTi2IoSv3JGx0Jd68=; b=cxGL4qZqLeAlP/OS3/K0PMWu8U ihlfoW83p4bpMZXxN9rTJNV6u9n/gqDJJIqYwZ0xhE57Ie5LoIeWIaOG34Fj+j6cuUSFpe9TWPhRP RCZAWKt4YI4okiwzLMAN5JNQb6e8vPtipWUnHALzp0xovTPQECwfp2nONK/nluzCb5p61RMCJyO/E cT3f4v9wgUVswQYksIdB+nfyTOrx8jWzoA6b5ji52Yq73+ViKIGbAhgVAIarA/vRj0z3B1aj0vT7E 3FIkVqJYx7C9lRL5FrtFrrqtLN1shofpe0mZRv3DDsECYvO/vQ0dtaWHRPcvVdma+YWG7rn2H6v/7 OQ8whw0A==; Received: from [50.53.46.231] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1rG9bq-001aN9-1s; Thu, 21 Dec 2023 03:20:30 +0000 From: Randy Dunlap To: linux-kernel@vger.kernel.org Subject: [PATCH 2/4] drm/i915/gt: reconcile Excess struct member kernel-doc warnings Date: Wed, 20 Dec 2023 19:20:27 -0800 Message-ID: <20231221032029.30942-2-rdunlap@infradead.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231221032029.30942-1-rdunlap@infradead.org> References: <20231221032029.30942-1-rdunlap@infradead.org> 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: Tvrtko Ursulin , Randy Dunlap , Jonathan Corbet , intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Rodrigo Vivi Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Document nested struct members with full names as described in Documentation/doc-guide/kernel-doc.rst. intel_gsc.h:34: warning: Excess struct member 'gem_obj' description in 'intel_gsc' Also add missing field member descriptions. Signed-off-by: Randy Dunlap Cc: Jani Nikula Cc: Joonas Lahtinen Cc: Rodrigo Vivi Cc: Tvrtko Ursulin Cc: intel-gfx@lists.freedesktop.org Cc: Jonathan Corbet Cc: dri-devel@lists.freedesktop.org --- drivers/gpu/drm/i915/gt/intel_gsc.h | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff -- a/drivers/gpu/drm/i915/gt/intel_gsc.h b/drivers/gpu/drm/i915/gt/intel_gsc.h --- a/drivers/gpu/drm/i915/gt/intel_gsc.h +++ b/drivers/gpu/drm/i915/gt/intel_gsc.h @@ -21,8 +21,11 @@ struct mei_aux_device; /** * struct intel_gsc - graphics security controller * - * @gem_obj: scratch memory GSC operations - * @intf : gsc interface + * @intf : gsc interface + * @intf.adev : MEI aux. device for this @intf + * @intf.gem_obj : scratch memory GSC operations + * @intf.irq : IRQ for this device (%-1 for no IRQ) + * @intf.id : this interface's id number/index */ struct intel_gsc { struct intel_gsc_intf { From patchwork Thu Dec 21 03:20:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Randy Dunlap X-Patchwork-Id: 13500959 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 58B41C3DA6E for ; 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Received: from [50.53.46.231] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1rG9bq-001aN9-2s; Thu, 21 Dec 2023 03:20:30 +0000 From: Randy Dunlap To: linux-kernel@vger.kernel.org Subject: [PATCH 3/4] drm/i915/guc: reconcile Excess struct member kernel-doc warnings Date: Wed, 20 Dec 2023 19:20:28 -0800 Message-ID: <20231221032029.30942-3-rdunlap@infradead.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231221032029.30942-1-rdunlap@infradead.org> References: <20231221032029.30942-1-rdunlap@infradead.org> 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: Tvrtko Ursulin , Randy Dunlap , Jonathan Corbet , intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Rodrigo Vivi Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Document nested struct members with full names as described in Documentation/doc-guide/kernel-doc.rst. intel_guc.h:305: warning: Excess struct member 'lock' description in 'intel_guc' intel_guc.h:305: warning: Excess struct member 'guc_ids' description in 'intel_guc' intel_guc.h:305: warning: Excess struct member 'num_guc_ids' description in 'intel_guc' intel_guc.h:305: warning: Excess struct member 'guc_ids_bitmap' description in 'intel_guc' intel_guc.h:305: warning: Excess struct member 'guc_id_list' description in 'intel_guc' intel_guc.h:305: warning: Excess struct member 'guc_ids_in_use' description in 'intel_guc' intel_guc.h:305: warning: Excess struct member 'destroyed_contexts' description in 'intel_guc' intel_guc.h:305: warning: Excess struct member 'destroyed_worker' description in 'intel_guc' intel_guc.h:305: warning: Excess struct member 'reset_fail_worker' description in 'intel_guc' intel_guc.h:305: warning: Excess struct member 'reset_fail_mask' description in 'intel_guc' intel_guc.h:305: warning: Excess struct member 'sched_disable_delay_ms' description in 'intel_guc' intel_guc.h:305: warning: Excess struct member 'sched_disable_gucid_threshold' description in 'intel_guc' intel_guc.h:305: warning: Excess struct member 'lock' description in 'intel_guc' intel_guc.h:305: warning: Excess struct member 'gt_stamp' description in 'intel_guc' intel_guc.h:305: warning: Excess struct member 'ping_delay' description in 'intel_guc' intel_guc.h:305: warning: Excess struct member 'work' description in 'intel_guc' intel_guc.h:305: warning: Excess struct member 'shift' description in 'intel_guc' intel_guc.h:305: warning: Excess struct member 'last_stat_jiffies' description in 'intel_guc' 18 warnings as Errors Signed-off-by: Randy Dunlap Cc: Jani Nikula Cc: Joonas Lahtinen Cc: Rodrigo Vivi Cc: Tvrtko Ursulin Cc: intel-gfx@lists.freedesktop.org Cc: Jonathan Corbet Cc: dri-devel@lists.freedesktop.org --- drivers/gpu/drm/i915/gt/uc/intel_guc.h | 75 ++++++++++++----------- 1 file changed, 42 insertions(+), 33 deletions(-) diff -- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h --- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.h @@ -105,61 +105,67 @@ struct intel_guc { */ struct { /** - * @lock: protects everything in submission_state, - * ce->guc_id.id, and ce->guc_id.ref when transitioning in and - * out of zero + * @submission_state.lock: protects everything in + * submission_state, ce->guc_id.id, and ce->guc_id.ref + * when transitioning in and out of zero */ spinlock_t lock; /** - * @guc_ids: used to allocate new guc_ids, single-lrc + * @submission_state.guc_ids: used to allocate new + * guc_ids, single-lrc */ struct ida guc_ids; /** - * @num_guc_ids: Number of guc_ids, selftest feature to be able - * to reduce this number while testing. + * @submission_state.num_guc_ids: Number of guc_ids, selftest + * feature to be able to reduce this number while testing. */ int num_guc_ids; /** - * @guc_ids_bitmap: used to allocate new guc_ids, multi-lrc + * @submission_state.guc_ids_bitmap: used to allocate + * new guc_ids, multi-lrc */ unsigned long *guc_ids_bitmap; /** - * @guc_id_list: list of intel_context with valid guc_ids but no - * refs + * @submission_state.guc_id_list: list of intel_context + * with valid guc_ids but no refs */ struct list_head guc_id_list; /** - * @guc_ids_in_use: Number single-lrc guc_ids in use + * @submission_state.guc_ids_in_use: Number single-lrc + * guc_ids in use */ unsigned int guc_ids_in_use; /** - * @destroyed_contexts: list of contexts waiting to be destroyed - * (deregistered with the GuC) + * @submission_state.destroyed_contexts: list of contexts + * waiting to be destroyed (deregistered with the GuC) */ struct list_head destroyed_contexts; /** - * @destroyed_worker: worker to deregister contexts, need as we - * need to take a GT PM reference and can't from destroy - * function as it might be in an atomic context (no sleeping) + * @submission_state.destroyed_worker: worker to deregister + * contexts, need as we need to take a GT PM reference and + * can't from destroy function as it might be in an atomic + * context (no sleeping) */ struct work_struct destroyed_worker; /** - * @reset_fail_worker: worker to trigger a GT reset after an - * engine reset fails + * @submission_state.reset_fail_worker: worker to trigger + * a GT reset after an engine reset fails */ struct work_struct reset_fail_worker; /** - * @reset_fail_mask: mask of engines that failed to reset + * @submission_state.reset_fail_mask: mask of engines that + * failed to reset */ intel_engine_mask_t reset_fail_mask; /** - * @sched_disable_delay_ms: schedule disable delay, in ms, for - * contexts + * @submission_state.sched_disable_delay_ms: schedule + * disable delay, in ms, for contexts */ unsigned int sched_disable_delay_ms; /** - * @sched_disable_gucid_threshold: threshold of min remaining available - * guc_ids before we start bypassing the schedule disable delay + * @submission_state.sched_disable_gucid_threshold: + * threshold of min remaining available guc_ids before + * we start bypassing the schedule disable delay */ unsigned int sched_disable_gucid_threshold; } submission_state; @@ -243,37 +249,40 @@ struct intel_guc { */ struct { /** - * @lock: Lock protecting the below fields and the engine stats. + * @timestamp.lock: Lock protecting the below fields and + * the engine stats. */ spinlock_t lock; /** - * @gt_stamp: 64 bit extended value of the GT timestamp. + * @timestamp.gt_stamp: 64-bit extended value of the GT + * timestamp. */ u64 gt_stamp; /** - * @ping_delay: Period for polling the GT timestamp for - * overflow. + * @timestamp.ping_delay: Period for polling the GT + * timestamp for overflow. */ unsigned long ping_delay; /** - * @work: Periodic work to adjust GT timestamp, engine and - * context usage for overflows. + * @timestamp.work: Periodic work to adjust GT timestamp, + * engine and context usage for overflows. */ struct delayed_work work; /** - * @shift: Right shift value for the gpm timestamp + * @timestamp.shift: Right shift value for the gpm timestamp */ u32 shift; /** - * @last_stat_jiffies: jiffies at last actual stats collection time - * We use this timestamp to ensure we don't oversample the - * stats because runtime power management events can trigger - * stats collection at much higher rates than required. + * @timestamp.last_stat_jiffies: jiffies at last actual + * stats collection time. We use this timestamp to ensure + * we don't oversample the stats because runtime power + * management events can trigger stats collection at much + * higher rates than required. */ unsigned long last_stat_jiffies; } timestamp; From patchwork Thu Dec 21 03:20:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Randy Dunlap X-Patchwork-Id: 13500961 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 48F29C46CD2 for ; Thu, 21 Dec 2023 03:20:47 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 431C610E64C; Thu, 21 Dec 2023 03:20:37 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) by gabe.freedesktop.org (Postfix) with ESMTPS id 0504E10E64C; Thu, 21 Dec 2023 03:20:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=Om7KGzS/g2Y7wQ9rvSrrGdz3FHj7wYsDCL1dsHV/Wu0=; b=d5zq35ggn427N91YatbcRRHKN0 btcolbNdCwea4DDkcdb1wfpYKzT/VxA7xPTpjEl/a8QCUHr20uiNrTAUAmXc12Zvf3wEeKliw4oD2 drCBHe+Kmkjwf4c7jLY4Qfm3hbHvq+jaglYk5prI062CenLStMBKcEjy/8QrLcwj2EGALGMcPiNsd W3hvUag1HDi8G/eQ5/REPo8QKGIgPGWSHT32TamJtNySJvbvH1fWe3m+BSHVVocY1wFExCXxI+Nah F1pYLuzY+kMSe5uYU7qaHs4gBdg96o/ckHNoWiWAwp57ZB7hvr9tBgfosWU3KPAIb2SUe2/+bfh4R NpQklf8A==; Received: from [50.53.46.231] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1rG9br-001aN9-0c; Thu, 21 Dec 2023 03:20:31 +0000 From: Randy Dunlap To: linux-kernel@vger.kernel.org Subject: [PATCH 4/4] drm/i915/perf: reconcile Excess struct member kernel-doc warnings Date: Wed, 20 Dec 2023 19:20:29 -0800 Message-ID: <20231221032029.30942-4-rdunlap@infradead.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231221032029.30942-1-rdunlap@infradead.org> References: <20231221032029.30942-1-rdunlap@infradead.org> 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: Tvrtko Ursulin , Randy Dunlap , Jonathan Corbet , intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Rodrigo Vivi Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Document nested struct members with full names as described in Documentation/doc-guide/kernel-doc.rst. i915_perf_types.h:341: warning: Excess struct member 'ptr_lock' description in 'i915_perf_stream' i915_perf_types.h:341: warning: Excess struct member 'head' description in 'i915_perf_stream' i915_perf_types.h:341: warning: Excess struct member 'tail' description in 'i915_perf_stream' 3 warnings as Errors Signed-off-by: Randy Dunlap Cc: Jani Nikula Cc: Joonas Lahtinen Cc: Rodrigo Vivi Cc: Tvrtko Ursulin Cc: intel-gfx@lists.freedesktop.org Cc: Jonathan Corbet Cc: dri-devel@lists.freedesktop.org Reviewed-by: Rodrigo Vivi --- drivers/gpu/drm/i915/i915_perf_types.h | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff -- a/drivers/gpu/drm/i915/i915_perf_types.h b/drivers/gpu/drm/i915/i915_perf_types.h --- a/drivers/gpu/drm/i915/i915_perf_types.h +++ b/drivers/gpu/drm/i915/i915_perf_types.h @@ -291,7 +291,8 @@ struct i915_perf_stream { int size_exponent; /** - * @ptr_lock: Locks reads and writes to all head/tail state + * @oa_buffer.ptr_lock: Locks reads and writes to all + * head/tail state * * Consider: the head and tail pointer state needs to be read * consistently from a hrtimer callback (atomic context) and @@ -313,7 +314,8 @@ struct i915_perf_stream { spinlock_t ptr_lock; /** - * @head: Although we can always read back the head pointer register, + * @oa_buffer.head: Although we can always read back + * the head pointer register, * we prefer to avoid trusting the HW state, just to avoid any * risk that some hardware condition could * somehow bump the * head pointer unpredictably and cause us to forward the wrong @@ -322,7 +324,8 @@ struct i915_perf_stream { u32 head; /** - * @tail: The last verified tail that can be read by userspace. + * @oa_buffer.tail: The last verified tail that can be + * read by userspace. */ u32 tail; } oa_buffer;