From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C473214B96E for ; Fri, 6 Sep 2024 07:25:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.167.242.64 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725607530; cv=none; b=Kr/fNer/MwT6Z2E+FlWGk9Y23x1eNYNpPkXx/q80D4iV2L/yo0NG+TLLzD2/e6z5AcczMidcO33EwfVrFluI7uEAmHeyVDjokxQ/+W0EZqjZhGz6RIO9Lmz8uF/UF0lT9XIb/vSETZiGP8Ue/NGIyP9kpuhGOlLz6g12wUAQiDk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725607530; c=relaxed/simple; bh=h6MYM/yBuO6U3NBFZ8tXuWNXdaS3S22/P0/XKjqxOmA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pUTKJsy17vTo3dCm5/roNhSmfGlYk2l6YYkWg+7P2tqXLui8y9H0q8lfaS1jXsDgtRKmNGaH3o3p0UOXOE4VwRRA2jBHVWRNwAGg9PDnv8jpIgz0EsJ0pZOR0ks13NyCow/WuyYLk6paD1IBPg4eGDEvAzucqiIM/l/xIdIHRok= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com; spf=pass smtp.mailfrom=ideasonboard.com; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b=vAoBrlpl; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="vAoBrlpl" Received: from umang.jain (unknown [IPv6:2405:201:2015:f873:c173:4b:4a04:3a21]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 75BBBFEF; Fri, 6 Sep 2024 09:24:04 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1725607446; bh=h6MYM/yBuO6U3NBFZ8tXuWNXdaS3S22/P0/XKjqxOmA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vAoBrlplOdEv/Wvjwv3YTuFwPw+Mfy3mfkL8GEx2YYSru5O/A3Ss7CTadJT+LbMYY 7La2RCxLHQ+s+Y43V05D/+SBfxH/JYeGBQ4/HihItN8g45q4cL4wxz6EOLYHzNuxFX T7uoGAW/OPuTLNKdMoQOKNSZKjqIl2nKlT6sYvzg= From: Umang Jain To: Florian Fainelli , Broadcom internal kernel review list , Greg Kroah-Hartman Cc: linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org, Kieran Bingham , Arnd Bergmann , Stefan Wahren , Dave Stevenson , Phil Elwell , Laurent Pinchart , Umang Jain Subject: [PATCH v4 1/7] staging: vchiq: Factor out bulk transfer for VCHIQ_BULK_MODE_WAITING Date: Fri, 6 Sep 2024 12:55:00 +0530 Message-ID: <20240906072506.174026-2-umang.jain@ideasonboard.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240906072506.174026-1-umang.jain@ideasonboard.com> References: <20240906072506.174026-1-umang.jain@ideasonboard.com> Precedence: bulk X-Mailing-List: linux-staging@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The bulk transfer is VCHIQ_BULK_MODE_WAITING is used by VCHIQ ioctl interface. It is factored out to a separate function from vchiq_bulk_transfer() to bulk_xfer_waiting_interruptible(). This is a part of vchiq_bulk_transfer refactoring. Each bulk mode will have their dedicated functions to execute bulk transfers. Each mode will be handled separately in subsequent patches. bulk_xfer_waiting_interruptible() is suffixed with "_interruptible" to denote that it can be interrupted when a signal is received. -EAGAIN maybe returned in those cases, similar to what vchiq_bulk_transfer() does. Adjust the vchiq_irq_queue_bulk_tx_rx() in the vchiq-dev.c to call bulk_xfer_waiting_interruptible() for waiting mode. A temporary goto label has been introduced to jump the call execution over vchiq_bulk_transfer() for waiting mode only. When all dedicated bulk transfer calls are introduced, this label shall be dropped. No function changes intended in this patch. Signed-off-by: Umang Jain --- .../interface/vchiq_arm/vchiq_core.c | 53 ++++++++++++++++--- .../interface/vchiq_arm/vchiq_core.h | 4 ++ .../interface/vchiq_arm/vchiq_dev.c | 5 ++ 3 files changed, 54 insertions(+), 8 deletions(-) diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c index 50af04b217f4..2239f59519be 100644 --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c @@ -3023,10 +3023,6 @@ int vchiq_bulk_transfer(struct vchiq_instance *instance, unsigned int handle, bulk_waiter->actual = 0; bulk_waiter->bulk = NULL; break; - case VCHIQ_BULK_MODE_WAITING: - bulk_waiter = userdata; - bulk = bulk_waiter->bulk; - goto waiting; default: goto error_exit; } @@ -3115,11 +3111,8 @@ int vchiq_bulk_transfer(struct vchiq_instance *instance, unsigned int handle, state->id, service->localport, dir_char, queue->local_insert, queue->remote_insert, queue->process); -waiting: vchiq_service_put(service); - status = 0; - if (bulk_waiter) { bulk_waiter->bulk = bulk; if (wait_for_completion_interruptible(&bulk_waiter->event)) @@ -3128,7 +3121,7 @@ int vchiq_bulk_transfer(struct vchiq_instance *instance, unsigned int handle, status = -EINVAL; } - return status; + return 0; unlock_both_error_exit: mutex_unlock(&state->slot_mutex); @@ -3143,6 +3136,50 @@ int vchiq_bulk_transfer(struct vchiq_instance *instance, unsigned int handle, return status; } +/* + * This function is called by VCHIQ ioctl interface and is interruptible. + * It may receive -EAGAIN to indicate that a signal has been received + * and the call should be retried after being returned to user context. + */ +int +vchiq_bulk_xfer_waiting_interruptible(struct vchiq_instance *instance, + unsigned int handle, struct bulk_waiter *userdata) +{ + struct vchiq_service *service = find_service_by_handle(instance, handle); + struct bulk_waiter *bulk_waiter; + int status = -EINVAL; + + if (!service) + return -EINVAL; + + if (!userdata) + goto error_exit; + + if (service->srvstate != VCHIQ_SRVSTATE_OPEN) + goto error_exit; + + if (vchiq_check_service(service)) + goto error_exit; + + bulk_waiter = userdata; + + vchiq_service_put(service); + + status = 0; + + if (wait_for_completion_interruptible(&bulk_waiter->event)) + return -EAGAIN; + else if (bulk_waiter->actual == VCHIQ_BULK_ACTUAL_ABORTED) + return -EINVAL; + + return status; + +error_exit: + vchiq_service_put(service); + + return status; +} + int vchiq_queue_message(struct vchiq_instance *instance, unsigned int handle, ssize_t (*copy_callback)(void *context, void *dest, diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h index 77cc4d7ac077..985d9ea3a06a 100644 --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h @@ -470,6 +470,10 @@ vchiq_shutdown_internal(struct vchiq_state *state, struct vchiq_instance *instan extern void remote_event_pollall(struct vchiq_state *state); +extern int +vchiq_bulk_xfer_waiting_interruptible(struct vchiq_instance *instance, + unsigned int handle, struct bulk_waiter *userdata); + extern int vchiq_bulk_transfer(struct vchiq_instance *instance, unsigned int handle, void *offset, void __user *uoffset, int size, void *userdata, enum vchiq_bulk_mode mode, diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_dev.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_dev.c index 9cd2a64dce5e..550838d2863b 100644 --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_dev.c +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_dev.c @@ -324,6 +324,10 @@ static int vchiq_irq_queue_bulk_tx_rx(struct vchiq_instance *instance, dev_dbg(service->state->dev, "arm: found bulk_waiter %pK for pid %d\n", waiter, current->pid); userdata = &waiter->bulk_waiter; + + status = vchiq_bulk_xfer_waiting_interruptible(instance, args->handle, userdata); + + goto bulk_transfer_handled; } else { userdata = args->userdata; } @@ -331,6 +335,7 @@ static int vchiq_irq_queue_bulk_tx_rx(struct vchiq_instance *instance, status = vchiq_bulk_transfer(instance, args->handle, NULL, args->data, args->size, userdata, args->mode, dir); +bulk_transfer_handled: if (!waiter) { ret = 0; goto out; -- 2.45.2