[02/11] dma-buf/fence: add fence_array fences v6

Message ID	1464786612-5010-3-git-send-email-deathsimple@vodafone.de (mailing list archive)
State	New, archived
Headers	show Return-Path: <dri-devel-bounces@lists.freedesktop.org> From: =?UTF-8?q?Christian=20K=C3=B6nig?= <deathsimple@vodafone.de> To: dri-devel@lists.freedesktop.org Subject: [PATCH 02/11] dma-buf/fence: add fence_array fences v6 Date: Wed, 1 Jun 2016 15:10:03 +0200 Message-Id: <1464786612-5010-3-git-send-email-deathsimple@vodafone.de> In-Reply-To: <1464786612-5010-1-git-send-email-deathsimple@vodafone.de> References: <1464786612-5010-1-git-send-email-deathsimple@vodafone.de> MIME-Version: 1.0 Cc: linux-kernel@vger.kernel.org Precedence: list Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" <dri-devel-bounces@lists.freedesktop.org>

diff --git a/drivers/dma-buf/Makefile b/drivers/dma-buf/Makefile index 57a675f..85f6928 100644 --- a/drivers/dma-buf/Makefile +++ b/drivers/dma-buf/Makefile @@ -1 +1 @@ -obj-y := dma-buf.o fence.o reservation.o seqno-fence.o +obj-y := dma-buf.o fence.o reservation.o seqno-fence.o fence-array.o diff --git a/drivers/dma-buf/fence-array.c b/drivers/dma-buf/fence-array.c new file mode 100644 index 0000000..8141217 --- /dev/null +++ b/drivers/dma-buf/fence-array.c @@ -0,0 +1,127 @@ +/* + * fence-array: aggregate fences to be waited together + * + * Copyright (C) 2016 Collabora Ltd + * Copyright (C) 2016 Advanced Micro Devices, Inc. + * Authors: + * Gustavo Padovan <gustavo@padovan.org> + * Christian König <christian.koenig@amd.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include <linux/export.h> +#include <linux/slab.h> +#include <linux/fence-array.h> + +static void fence_array_cb_func(struct fence *f, struct fence_cb *cb); + +static const char *fence_array_get_driver_name(struct fence *fence) +{ + return "fence_array"; +} + +static const char *fence_array_get_timeline_name(struct fence *fence) +{ + return "unbound"; +} + +static void fence_array_cb_func(struct fence *f, struct fence_cb *cb) +{ + struct fence_array_cb *array_cb = + container_of(cb, struct fence_array_cb, cb); + struct fence_array *array = array_cb->array; + + if (atomic_dec_and_test(&array->num_pending)) + fence_signal(&array->base); +} + +static bool fence_array_enable_signaling(struct fence *fence) +{ + struct fence_array *array = to_fence_array(fence); + struct fence_array_cb *cb = (void *)(&array[1]); + unsigned i; + + for (i = 0; i < array->num_fences; ++i) { + cb[i].array = array; + if (fence_add_callback(array->fences[i], &cb[i].cb, + fence_array_cb_func)) + if (atomic_dec_and_test(&array->num_pending)) + return false; + } + + return true; +} + +static bool fence_array_signaled(struct fence *fence) +{ + struct fence_array *array = to_fence_array(fence); + + return atomic_read(&array->num_pending) == 0; +} + +static void fence_array_release(struct fence *fence) +{ + struct fence_array *array = to_fence_array(fence); + unsigned i; + + for (i = 0; i < array->num_fences; ++i) + fence_put(array->fences[i]); + + kfree(array->fences); + fence_free(fence); +} + +const struct fence_ops fence_array_ops = { + .get_driver_name = fence_array_get_driver_name, + .get_timeline_name = fence_array_get_timeline_name, + .enable_signaling = fence_array_enable_signaling, + .signaled = fence_array_signaled, + .wait = fence_default_wait, + .release = fence_array_release, +}; + +/** + * fence_array_create - Create a custom fence array + * @num_fences: [in] number of fences to add in the array + * @fences: [in] array containing the fences + * @context: [in] fence context to use + * @seqno: [in] sequence number to use + * + * Allocate a fence_array object and initialize the base fence with fence_init(). + * In case of error it returns NULL. + * + * The caller should allocte the fences array with num_fences size + * and fill it with the fences it wants to add to the object. Ownership of this + * array is take and fence_put() is used on each fence on release. + */ +struct fence_array *fence_array_create(int num_fences, struct fence **fences, + u64 context, unsigned seqno) +{ + struct fence_array *array; + size_t size = sizeof(*array); + + /* Allocate the callback structures behind the array. */ + size += num_fences * sizeof(struct fence_array_cb); + array = kzalloc(size, GFP_KERNEL); + if (!array) + return NULL; + + spin_lock_init(&array->lock); + fence_init(&array->base, &fence_array_ops, &array->lock, + context, seqno); + + array->num_fences = num_fences; + atomic_set(&array->num_pending, num_fences); + array->fences = fences; + + return array; +} +EXPORT_SYMBOL(fence_array_create); diff --git a/include/linux/fence-array.h b/include/linux/fence-array.h new file mode 100644 index 0000000..593ab98 --- /dev/null +++ b/include/linux/fence-array.h @@ -0,0 +1,72 @@ +/* + * fence-array: aggregates fence to be waited together + * + * Copyright (C) 2016 Collabora Ltd + * Copyright (C) 2016 Advanced Micro Devices, Inc. + * Authors: + * Gustavo Padovan <gustavo@padovan.org> + * Christian König <christian.koenig@amd.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#ifndef __LINUX_FENCE_ARRAY_H +#define __LINUX_FENCE_ARRAY_H + +#include <linux/fence.h> + +/** + * struct fence_array_cb - callback helper for fence array + * @cb: fence callback structure for signaling + * @array: reference to the parent fence array object + */ +struct fence_array_cb { + struct fence_cb cb; + struct fence_array *array; +}; + +/** + * struct fence_array - fence to represent an array of fences + * @base: fence base class + * @lock: spinlock for fence handling + * @num_fences: number of fences in the array + * @num_pending: fences in the array still pending + * @fences: array of the fences + */ +struct fence_array { + struct fence base; + + spinlock_t lock; + unsigned num_fences; + atomic_t num_pending; + struct fence **fences; +}; + +extern const struct fence_ops fence_array_ops; + +/** + * to_fence_array - cast a fence to a fence_array + * @fence: fence to cast to a fence_array + * + * Returns NULL if the fence is not a fence_array, + * or the fence_array otherwise. + */ +static inline struct fence_array *to_fence_array(struct fence *fence) +{ + if (fence->ops != &fence_array_ops) + return NULL; + + return container_of(fence, struct fence_array, base); +} + +struct fence_array *fence_array_create(int num_fences, struct fence **fences, + u64 context, unsigned seqno); + +#endif /* __LINUX_FENCE_ARRAY_H */

[02/11] dma-buf/fence: add fence_array fences v6

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