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-rw-r--r--drivers/gpu/drm/vgem/Makefile4
-rw-r--r--drivers/gpu/drm/vgem/vgem_drv.c183
-rw-r--r--drivers/gpu/drm/vgem/vgem_drv.h62
-rw-r--r--drivers/gpu/drm/vgem/vgem_fence.c253
4 files changed, 502 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vgem/Makefile b/drivers/gpu/drm/vgem/Makefile
new file mode 100644
index 000000000..55eb5be04
--- /dev/null
+++ b/drivers/gpu/drm/vgem/Makefile
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
+vgem-y := vgem_drv.o vgem_fence.o
+
+obj-$(CONFIG_DRM_VGEM) += vgem.o
diff --git a/drivers/gpu/drm/vgem/vgem_drv.c b/drivers/gpu/drm/vgem/vgem_drv.c
new file mode 100644
index 000000000..c5e3e5457
--- /dev/null
+++ b/drivers/gpu/drm/vgem/vgem_drv.c
@@ -0,0 +1,183 @@
+/*
+ * Copyright 2011 Red Hat, Inc.
+ * Copyright © 2014 The Chromium OS Authors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software")
+ * to deal in the software without restriction, including without limitation
+ * on the rights to use, copy, modify, merge, publish, distribute, sub
+ * license, and/or sell copies of the Software, and to permit persons to whom
+ * them Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTIBILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES, OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT, OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ * Adam Jackson <ajax@redhat.com>
+ * Ben Widawsky <ben@bwidawsk.net>
+ */
+
+/*
+ * This is vgem, a (non-hardware-backed) GEM service. This is used by Mesa's
+ * software renderer and the X server for efficient buffer sharing.
+ */
+
+#include <linux/dma-buf.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/shmem_fs.h>
+#include <linux/vmalloc.h>
+
+#include <drm/drm_drv.h>
+#include <drm/drm_file.h>
+#include <drm/drm_gem_shmem_helper.h>
+#include <drm/drm_ioctl.h>
+#include <drm/drm_managed.h>
+#include <drm/drm_prime.h>
+
+#include "vgem_drv.h"
+
+#define DRIVER_NAME "vgem"
+#define DRIVER_DESC "Virtual GEM provider"
+#define DRIVER_DATE "20120112"
+#define DRIVER_MAJOR 1
+#define DRIVER_MINOR 0
+
+static struct vgem_device {
+ struct drm_device drm;
+ struct platform_device *platform;
+} *vgem_device;
+
+static int vgem_open(struct drm_device *dev, struct drm_file *file)
+{
+ struct vgem_file *vfile;
+ int ret;
+
+ vfile = kzalloc(sizeof(*vfile), GFP_KERNEL);
+ if (!vfile)
+ return -ENOMEM;
+
+ file->driver_priv = vfile;
+
+ ret = vgem_fence_open(vfile);
+ if (ret) {
+ kfree(vfile);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void vgem_postclose(struct drm_device *dev, struct drm_file *file)
+{
+ struct vgem_file *vfile = file->driver_priv;
+
+ vgem_fence_close(vfile);
+ kfree(vfile);
+}
+
+static struct drm_ioctl_desc vgem_ioctls[] = {
+ DRM_IOCTL_DEF_DRV(VGEM_FENCE_ATTACH, vgem_fence_attach_ioctl, DRM_RENDER_ALLOW),
+ DRM_IOCTL_DEF_DRV(VGEM_FENCE_SIGNAL, vgem_fence_signal_ioctl, DRM_RENDER_ALLOW),
+};
+
+DEFINE_DRM_GEM_FOPS(vgem_driver_fops);
+
+static struct drm_gem_object *vgem_gem_create_object(struct drm_device *dev, size_t size)
+{
+ struct drm_gem_shmem_object *obj;
+
+ obj = kzalloc(sizeof(*obj), GFP_KERNEL);
+ if (!obj)
+ return ERR_PTR(-ENOMEM);
+
+ /*
+ * vgem doesn't have any begin/end cpu access ioctls, therefore must use
+ * coherent memory or dma-buf sharing just wont work.
+ */
+ obj->map_wc = true;
+
+ return &obj->base;
+}
+
+static const struct drm_driver vgem_driver = {
+ .driver_features = DRIVER_GEM | DRIVER_RENDER,
+ .open = vgem_open,
+ .postclose = vgem_postclose,
+ .ioctls = vgem_ioctls,
+ .num_ioctls = ARRAY_SIZE(vgem_ioctls),
+ .fops = &vgem_driver_fops,
+
+ DRM_GEM_SHMEM_DRIVER_OPS,
+ .gem_create_object = vgem_gem_create_object,
+
+ .name = DRIVER_NAME,
+ .desc = DRIVER_DESC,
+ .date = DRIVER_DATE,
+ .major = DRIVER_MAJOR,
+ .minor = DRIVER_MINOR,
+};
+
+static int __init vgem_init(void)
+{
+ int ret;
+ struct platform_device *pdev;
+
+ pdev = platform_device_register_simple("vgem", -1, NULL, 0);
+ if (IS_ERR(pdev))
+ return PTR_ERR(pdev);
+
+ if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL)) {
+ ret = -ENOMEM;
+ goto out_unregister;
+ }
+
+ dma_coerce_mask_and_coherent(&pdev->dev,
+ DMA_BIT_MASK(64));
+
+ vgem_device = devm_drm_dev_alloc(&pdev->dev, &vgem_driver,
+ struct vgem_device, drm);
+ if (IS_ERR(vgem_device)) {
+ ret = PTR_ERR(vgem_device);
+ goto out_devres;
+ }
+ vgem_device->platform = pdev;
+
+ /* Final step: expose the device/driver to userspace */
+ ret = drm_dev_register(&vgem_device->drm, 0);
+ if (ret)
+ goto out_devres;
+
+ return 0;
+
+out_devres:
+ devres_release_group(&pdev->dev, NULL);
+out_unregister:
+ platform_device_unregister(pdev);
+ return ret;
+}
+
+static void __exit vgem_exit(void)
+{
+ struct platform_device *pdev = vgem_device->platform;
+
+ drm_dev_unregister(&vgem_device->drm);
+ devres_release_group(&pdev->dev, NULL);
+ platform_device_unregister(pdev);
+}
+
+module_init(vgem_init);
+module_exit(vgem_exit);
+
+MODULE_AUTHOR("Red Hat, Inc.");
+MODULE_AUTHOR("Intel Corporation");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL and additional rights");
diff --git a/drivers/gpu/drm/vgem/vgem_drv.h b/drivers/gpu/drm/vgem/vgem_drv.h
new file mode 100644
index 000000000..0ed300317
--- /dev/null
+++ b/drivers/gpu/drm/vgem/vgem_drv.h
@@ -0,0 +1,62 @@
+/*
+ * Copyright © 2012 Intel Corporation
+ * Copyright © 2014 The Chromium OS Authors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ * Ben Widawsky <ben@bwidawsk.net>
+ *
+ */
+
+#ifndef _VGEM_DRV_H_
+#define _VGEM_DRV_H_
+
+#include <drm/drm_gem.h>
+#include <drm/drm_cache.h>
+
+#include <uapi/drm/vgem_drm.h>
+
+struct vgem_file {
+ struct idr fence_idr;
+ struct mutex fence_mutex;
+};
+
+#define to_vgem_bo(x) container_of(x, struct drm_vgem_gem_object, base)
+struct drm_vgem_gem_object {
+ struct drm_gem_object base;
+
+ struct page **pages;
+ unsigned int pages_pin_count;
+ struct mutex pages_lock;
+
+ struct sg_table *table;
+};
+
+int vgem_fence_open(struct vgem_file *file);
+int vgem_fence_attach_ioctl(struct drm_device *dev,
+ void *data,
+ struct drm_file *file);
+int vgem_fence_signal_ioctl(struct drm_device *dev,
+ void *data,
+ struct drm_file *file);
+void vgem_fence_close(struct vgem_file *file);
+
+#endif
diff --git a/drivers/gpu/drm/vgem/vgem_fence.c b/drivers/gpu/drm/vgem/vgem_fence.c
new file mode 100644
index 000000000..e15754178
--- /dev/null
+++ b/drivers/gpu/drm/vgem/vgem_fence.c
@@ -0,0 +1,253 @@
+/*
+ * Copyright 2016 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software")
+ * to deal in the software without restriction, including without limitation
+ * on the rights to use, copy, modify, merge, publish, distribute, sub
+ * license, and/or sell copies of the Software, and to permit persons to whom
+ * them Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTIBILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES, OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT, OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <linux/dma-buf.h>
+#include <linux/dma-resv.h>
+
+#include <drm/drm_file.h>
+
+#include "vgem_drv.h"
+
+#define VGEM_FENCE_TIMEOUT (10*HZ)
+
+struct vgem_fence {
+ struct dma_fence base;
+ struct spinlock lock;
+ struct timer_list timer;
+};
+
+static const char *vgem_fence_get_driver_name(struct dma_fence *fence)
+{
+ return "vgem";
+}
+
+static const char *vgem_fence_get_timeline_name(struct dma_fence *fence)
+{
+ return "unbound";
+}
+
+static void vgem_fence_release(struct dma_fence *base)
+{
+ struct vgem_fence *fence = container_of(base, typeof(*fence), base);
+
+ del_timer_sync(&fence->timer);
+ dma_fence_free(&fence->base);
+}
+
+static void vgem_fence_value_str(struct dma_fence *fence, char *str, int size)
+{
+ snprintf(str, size, "%llu", fence->seqno);
+}
+
+static void vgem_fence_timeline_value_str(struct dma_fence *fence, char *str,
+ int size)
+{
+ snprintf(str, size, "%llu",
+ dma_fence_is_signaled(fence) ? fence->seqno : 0);
+}
+
+static const struct dma_fence_ops vgem_fence_ops = {
+ .get_driver_name = vgem_fence_get_driver_name,
+ .get_timeline_name = vgem_fence_get_timeline_name,
+ .release = vgem_fence_release,
+
+ .fence_value_str = vgem_fence_value_str,
+ .timeline_value_str = vgem_fence_timeline_value_str,
+};
+
+static void vgem_fence_timeout(struct timer_list *t)
+{
+ struct vgem_fence *fence = from_timer(fence, t, timer);
+
+ dma_fence_signal(&fence->base);
+}
+
+static struct dma_fence *vgem_fence_create(struct vgem_file *vfile,
+ unsigned int flags)
+{
+ struct vgem_fence *fence;
+
+ fence = kzalloc(sizeof(*fence), GFP_KERNEL);
+ if (!fence)
+ return NULL;
+
+ spin_lock_init(&fence->lock);
+ dma_fence_init(&fence->base, &vgem_fence_ops, &fence->lock,
+ dma_fence_context_alloc(1), 1);
+
+ timer_setup(&fence->timer, vgem_fence_timeout, 0);
+
+ /* We force the fence to expire within 10s to prevent driver hangs */
+ mod_timer(&fence->timer, jiffies + VGEM_FENCE_TIMEOUT);
+
+ return &fence->base;
+}
+
+/*
+ * vgem_fence_attach_ioctl (DRM_IOCTL_VGEM_FENCE_ATTACH):
+ *
+ * Create and attach a fence to the vGEM handle. This fence is then exposed
+ * via the dma-buf reservation object and visible to consumers of the exported
+ * dma-buf. If the flags contain VGEM_FENCE_WRITE, the fence indicates the
+ * vGEM buffer is being written to by the client and is exposed as an exclusive
+ * fence, otherwise the fence indicates the client is current reading from the
+ * buffer and all future writes should wait for the client to signal its
+ * completion. Note that if a conflicting fence is already on the dma-buf (i.e.
+ * an exclusive fence when adding a read, or any fence when adding a write),
+ * -EBUSY is reported. Serialisation between operations should be handled
+ * by waiting upon the dma-buf.
+ *
+ * This returns the handle for the new fence that must be signaled within 10
+ * seconds (or otherwise it will automatically expire). See
+ * vgem_fence_signal_ioctl (DRM_IOCTL_VGEM_FENCE_SIGNAL).
+ *
+ * If the vGEM handle does not exist, vgem_fence_attach_ioctl returns -ENOENT.
+ */
+int vgem_fence_attach_ioctl(struct drm_device *dev,
+ void *data,
+ struct drm_file *file)
+{
+ struct drm_vgem_fence_attach *arg = data;
+ struct vgem_file *vfile = file->driver_priv;
+ struct dma_resv *resv;
+ struct drm_gem_object *obj;
+ enum dma_resv_usage usage;
+ struct dma_fence *fence;
+ int ret;
+
+ if (arg->flags & ~VGEM_FENCE_WRITE)
+ return -EINVAL;
+
+ if (arg->pad)
+ return -EINVAL;
+
+ obj = drm_gem_object_lookup(file, arg->handle);
+ if (!obj)
+ return -ENOENT;
+
+ fence = vgem_fence_create(vfile, arg->flags);
+ if (!fence) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ /* Check for a conflicting fence */
+ resv = obj->resv;
+ usage = dma_resv_usage_rw(arg->flags & VGEM_FENCE_WRITE);
+ if (!dma_resv_test_signaled(resv, usage)) {
+ ret = -EBUSY;
+ goto err_fence;
+ }
+
+ /* Expose the fence via the dma-buf */
+ dma_resv_lock(resv, NULL);
+ ret = dma_resv_reserve_fences(resv, 1);
+ if (!ret)
+ dma_resv_add_fence(resv, fence, arg->flags & VGEM_FENCE_WRITE ?
+ DMA_RESV_USAGE_WRITE : DMA_RESV_USAGE_READ);
+ dma_resv_unlock(resv);
+
+ /* Record the fence in our idr for later signaling */
+ if (ret == 0) {
+ mutex_lock(&vfile->fence_mutex);
+ ret = idr_alloc(&vfile->fence_idr, fence, 1, 0, GFP_KERNEL);
+ mutex_unlock(&vfile->fence_mutex);
+ if (ret > 0) {
+ arg->out_fence = ret;
+ ret = 0;
+ }
+ }
+err_fence:
+ if (ret) {
+ dma_fence_signal(fence);
+ dma_fence_put(fence);
+ }
+err:
+ drm_gem_object_put(obj);
+ return ret;
+}
+
+/*
+ * vgem_fence_signal_ioctl (DRM_IOCTL_VGEM_FENCE_SIGNAL):
+ *
+ * Signal and consume a fence ealier attached to a vGEM handle using
+ * vgem_fence_attach_ioctl (DRM_IOCTL_VGEM_FENCE_ATTACH).
+ *
+ * All fences must be signaled within 10s of attachment or otherwise they
+ * will automatically expire (and a vgem_fence_signal_ioctl returns -ETIMEDOUT).
+ *
+ * Signaling a fence indicates to all consumers of the dma-buf that the
+ * client has completed the operation associated with the fence, and that the
+ * buffer is then ready for consumption.
+ *
+ * If the fence does not exist (or has already been signaled by the client),
+ * vgem_fence_signal_ioctl returns -ENOENT.
+ */
+int vgem_fence_signal_ioctl(struct drm_device *dev,
+ void *data,
+ struct drm_file *file)
+{
+ struct vgem_file *vfile = file->driver_priv;
+ struct drm_vgem_fence_signal *arg = data;
+ struct dma_fence *fence;
+ int ret = 0;
+
+ if (arg->flags)
+ return -EINVAL;
+
+ mutex_lock(&vfile->fence_mutex);
+ fence = idr_replace(&vfile->fence_idr, NULL, arg->fence);
+ mutex_unlock(&vfile->fence_mutex);
+ if (!fence)
+ return -ENOENT;
+ if (IS_ERR(fence))
+ return PTR_ERR(fence);
+
+ if (dma_fence_is_signaled(fence))
+ ret = -ETIMEDOUT;
+
+ dma_fence_signal(fence);
+ dma_fence_put(fence);
+ return ret;
+}
+
+int vgem_fence_open(struct vgem_file *vfile)
+{
+ mutex_init(&vfile->fence_mutex);
+ idr_init_base(&vfile->fence_idr, 1);
+
+ return 0;
+}
+
+static int __vgem_fence_idr_fini(int id, void *p, void *data)
+{
+ dma_fence_signal(p);
+ dma_fence_put(p);
+ return 0;
+}
+
+void vgem_fence_close(struct vgem_file *vfile)
+{
+ idr_for_each(&vfile->fence_idr, __vgem_fence_idr_fini, vfile);
+ idr_destroy(&vfile->fence_idr);
+ mutex_destroy(&vfile->fence_mutex);
+}