ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/drivers/gpu/drm/vgem/Makefile b/marvell/linux/drivers/gpu/drm/vgem/Makefile
new file mode 100644
index 0000000..55eb5be
--- /dev/null
+++ b/marvell/linux/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/marvell/linux/drivers/gpu/drm/vgem/vgem_drv.c b/marvell/linux/drivers/gpu/drm/vgem/vgem_drv.c
new file mode 100644
index 0000000..204d1df
--- /dev/null
+++ b/marvell/linux/drivers/gpu/drm/vgem/vgem_drv.c
@@ -0,0 +1,494 @@
+/*
+ * 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_ioctl.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 void vgem_gem_free_object(struct drm_gem_object *obj)
+{
+ struct drm_vgem_gem_object *vgem_obj = to_vgem_bo(obj);
+
+ kvfree(vgem_obj->pages);
+ mutex_destroy(&vgem_obj->pages_lock);
+
+ if (obj->import_attach)
+ drm_prime_gem_destroy(obj, vgem_obj->table);
+
+ drm_gem_object_release(obj);
+ kfree(vgem_obj);
+}
+
+static vm_fault_t vgem_gem_fault(struct vm_fault *vmf)
+{
+ struct vm_area_struct *vma = vmf->vma;
+ struct drm_vgem_gem_object *obj = vma->vm_private_data;
+ /* We don't use vmf->pgoff since that has the fake offset */
+ unsigned long vaddr = vmf->address;
+ vm_fault_t ret = VM_FAULT_SIGBUS;
+ loff_t num_pages;
+ pgoff_t page_offset;
+ page_offset = (vaddr - vma->vm_start) >> PAGE_SHIFT;
+
+ num_pages = DIV_ROUND_UP(obj->base.size, PAGE_SIZE);
+
+ if (page_offset >= num_pages)
+ return VM_FAULT_SIGBUS;
+
+ mutex_lock(&obj->pages_lock);
+ if (obj->pages) {
+ get_page(obj->pages[page_offset]);
+ vmf->page = obj->pages[page_offset];
+ ret = 0;
+ }
+ mutex_unlock(&obj->pages_lock);
+ if (ret) {
+ struct page *page;
+
+ page = shmem_read_mapping_page(
+ file_inode(obj->base.filp)->i_mapping,
+ page_offset);
+ if (!IS_ERR(page)) {
+ vmf->page = page;
+ ret = 0;
+ } else switch (PTR_ERR(page)) {
+ case -ENOSPC:
+ case -ENOMEM:
+ ret = VM_FAULT_OOM;
+ break;
+ case -EBUSY:
+ ret = VM_FAULT_RETRY;
+ break;
+ case -EFAULT:
+ case -EINVAL:
+ ret = VM_FAULT_SIGBUS;
+ break;
+ default:
+ WARN_ON(PTR_ERR(page));
+ ret = VM_FAULT_SIGBUS;
+ break;
+ }
+
+ }
+ return ret;
+}
+
+static const struct vm_operations_struct vgem_gem_vm_ops = {
+ .fault = vgem_gem_fault,
+ .open = drm_gem_vm_open,
+ .close = drm_gem_vm_close,
+};
+
+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_vgem_gem_object *__vgem_gem_create(struct drm_device *dev,
+ unsigned long size)
+{
+ struct drm_vgem_gem_object *obj;
+ int ret;
+
+ obj = kzalloc(sizeof(*obj), GFP_KERNEL);
+ if (!obj)
+ return ERR_PTR(-ENOMEM);
+
+ ret = drm_gem_object_init(dev, &obj->base, roundup(size, PAGE_SIZE));
+ if (ret) {
+ kfree(obj);
+ return ERR_PTR(ret);
+ }
+
+ mutex_init(&obj->pages_lock);
+
+ return obj;
+}
+
+static void __vgem_gem_destroy(struct drm_vgem_gem_object *obj)
+{
+ drm_gem_object_release(&obj->base);
+ kfree(obj);
+}
+
+static struct drm_gem_object *vgem_gem_create(struct drm_device *dev,
+ struct drm_file *file,
+ unsigned int *handle,
+ unsigned long size)
+{
+ struct drm_vgem_gem_object *obj;
+ int ret;
+
+ obj = __vgem_gem_create(dev, size);
+ if (IS_ERR(obj))
+ return ERR_CAST(obj);
+
+ ret = drm_gem_handle_create(file, &obj->base, handle);
+ if (ret) {
+ drm_gem_object_put_unlocked(&obj->base);
+ return ERR_PTR(ret);
+ }
+
+ return &obj->base;
+}
+
+static int vgem_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
+ struct drm_mode_create_dumb *args)
+{
+ struct drm_gem_object *gem_object;
+ u64 pitch, size;
+
+ pitch = args->width * DIV_ROUND_UP(args->bpp, 8);
+ size = args->height * pitch;
+ if (size == 0)
+ return -EINVAL;
+
+ gem_object = vgem_gem_create(dev, file, &args->handle, size);
+ if (IS_ERR(gem_object))
+ return PTR_ERR(gem_object);
+
+ args->size = gem_object->size;
+ args->pitch = pitch;
+
+ drm_gem_object_put_unlocked(gem_object);
+
+ DRM_DEBUG("Created object of size %llu\n", args->size);
+
+ return 0;
+}
+
+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),
+};
+
+static int vgem_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+ unsigned long flags = vma->vm_flags;
+ int ret;
+
+ ret = drm_gem_mmap(filp, vma);
+ if (ret)
+ return ret;
+
+ /* Keep the WC mmaping set by drm_gem_mmap() but our pages
+ * are ordinary and not special.
+ */
+ vma->vm_flags = flags | VM_DONTEXPAND | VM_DONTDUMP;
+ return 0;
+}
+
+static const struct file_operations vgem_driver_fops = {
+ .owner = THIS_MODULE,
+ .open = drm_open,
+ .mmap = vgem_mmap,
+ .poll = drm_poll,
+ .read = drm_read,
+ .unlocked_ioctl = drm_ioctl,
+ .compat_ioctl = drm_compat_ioctl,
+ .release = drm_release,
+};
+
+static struct page **vgem_pin_pages(struct drm_vgem_gem_object *bo)
+{
+ mutex_lock(&bo->pages_lock);
+ if (bo->pages_pin_count++ == 0) {
+ struct page **pages;
+
+ pages = drm_gem_get_pages(&bo->base);
+ if (IS_ERR(pages)) {
+ bo->pages_pin_count--;
+ mutex_unlock(&bo->pages_lock);
+ return pages;
+ }
+
+ bo->pages = pages;
+ }
+ mutex_unlock(&bo->pages_lock);
+
+ return bo->pages;
+}
+
+static void vgem_unpin_pages(struct drm_vgem_gem_object *bo)
+{
+ mutex_lock(&bo->pages_lock);
+ if (--bo->pages_pin_count == 0) {
+ drm_gem_put_pages(&bo->base, bo->pages, true, true);
+ bo->pages = NULL;
+ }
+ mutex_unlock(&bo->pages_lock);
+}
+
+static int vgem_prime_pin(struct drm_gem_object *obj)
+{
+ struct drm_vgem_gem_object *bo = to_vgem_bo(obj);
+ long n_pages = obj->size >> PAGE_SHIFT;
+ struct page **pages;
+
+ pages = vgem_pin_pages(bo);
+ if (IS_ERR(pages))
+ return PTR_ERR(pages);
+
+ /* Flush the object from the CPU cache so that importers can rely
+ * on coherent indirect access via the exported dma-address.
+ */
+ drm_clflush_pages(pages, n_pages);
+
+ return 0;
+}
+
+static void vgem_prime_unpin(struct drm_gem_object *obj)
+{
+ struct drm_vgem_gem_object *bo = to_vgem_bo(obj);
+
+ vgem_unpin_pages(bo);
+}
+
+static struct sg_table *vgem_prime_get_sg_table(struct drm_gem_object *obj)
+{
+ struct drm_vgem_gem_object *bo = to_vgem_bo(obj);
+
+ return drm_prime_pages_to_sg(bo->pages, bo->base.size >> PAGE_SHIFT);
+}
+
+static struct drm_gem_object* vgem_prime_import(struct drm_device *dev,
+ struct dma_buf *dma_buf)
+{
+ struct vgem_device *vgem = container_of(dev, typeof(*vgem), drm);
+
+ return drm_gem_prime_import_dev(dev, dma_buf, &vgem->platform->dev);
+}
+
+static struct drm_gem_object *vgem_prime_import_sg_table(struct drm_device *dev,
+ struct dma_buf_attachment *attach, struct sg_table *sg)
+{
+ struct drm_vgem_gem_object *obj;
+ int npages;
+
+ obj = __vgem_gem_create(dev, attach->dmabuf->size);
+ if (IS_ERR(obj))
+ return ERR_CAST(obj);
+
+ npages = PAGE_ALIGN(attach->dmabuf->size) / PAGE_SIZE;
+
+ obj->table = sg;
+ obj->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
+ if (!obj->pages) {
+ __vgem_gem_destroy(obj);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ obj->pages_pin_count++; /* perma-pinned */
+ drm_prime_sg_to_page_addr_arrays(obj->table, obj->pages, NULL,
+ npages);
+ return &obj->base;
+}
+
+static void *vgem_prime_vmap(struct drm_gem_object *obj)
+{
+ struct drm_vgem_gem_object *bo = to_vgem_bo(obj);
+ long n_pages = obj->size >> PAGE_SHIFT;
+ struct page **pages;
+
+ pages = vgem_pin_pages(bo);
+ if (IS_ERR(pages))
+ return NULL;
+
+ return vmap(pages, n_pages, 0, pgprot_writecombine(PAGE_KERNEL));
+}
+
+static void vgem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
+{
+ struct drm_vgem_gem_object *bo = to_vgem_bo(obj);
+
+ vunmap(vaddr);
+ vgem_unpin_pages(bo);
+}
+
+static int vgem_prime_mmap(struct drm_gem_object *obj,
+ struct vm_area_struct *vma)
+{
+ int ret;
+
+ if (obj->size < vma->vm_end - vma->vm_start)
+ return -EINVAL;
+
+ if (!obj->filp)
+ return -ENODEV;
+
+ ret = call_mmap(obj->filp, vma);
+ if (ret)
+ return ret;
+
+ fput(vma->vm_file);
+ vma->vm_file = get_file(obj->filp);
+ vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
+ vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
+
+ return 0;
+}
+
+static void vgem_release(struct drm_device *dev)
+{
+ struct vgem_device *vgem = container_of(dev, typeof(*vgem), drm);
+
+ platform_device_unregister(vgem->platform);
+ drm_dev_fini(&vgem->drm);
+
+ kfree(vgem);
+}
+
+static struct drm_driver vgem_driver = {
+ .driver_features = DRIVER_GEM | DRIVER_RENDER,
+ .release = vgem_release,
+ .open = vgem_open,
+ .postclose = vgem_postclose,
+ .gem_free_object_unlocked = vgem_gem_free_object,
+ .gem_vm_ops = &vgem_gem_vm_ops,
+ .ioctls = vgem_ioctls,
+ .num_ioctls = ARRAY_SIZE(vgem_ioctls),
+ .fops = &vgem_driver_fops,
+
+ .dumb_create = vgem_gem_dumb_create,
+
+ .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
+ .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
+ .gem_prime_pin = vgem_prime_pin,
+ .gem_prime_unpin = vgem_prime_unpin,
+ .gem_prime_import = vgem_prime_import,
+ .gem_prime_import_sg_table = vgem_prime_import_sg_table,
+ .gem_prime_get_sg_table = vgem_prime_get_sg_table,
+ .gem_prime_vmap = vgem_prime_vmap,
+ .gem_prime_vunmap = vgem_prime_vunmap,
+ .gem_prime_mmap = vgem_prime_mmap,
+
+ .name = DRIVER_NAME,
+ .desc = DRIVER_DESC,
+ .date = DRIVER_DATE,
+ .major = DRIVER_MAJOR,
+ .minor = DRIVER_MINOR,
+};
+
+static int __init vgem_init(void)
+{
+ int ret;
+
+ vgem_device = kzalloc(sizeof(*vgem_device), GFP_KERNEL);
+ if (!vgem_device)
+ return -ENOMEM;
+
+ vgem_device->platform =
+ platform_device_register_simple("vgem", -1, NULL, 0);
+ if (IS_ERR(vgem_device->platform)) {
+ ret = PTR_ERR(vgem_device->platform);
+ goto out_free;
+ }
+
+ dma_coerce_mask_and_coherent(&vgem_device->platform->dev,
+ DMA_BIT_MASK(64));
+ ret = drm_dev_init(&vgem_device->drm, &vgem_driver,
+ &vgem_device->platform->dev);
+ if (ret)
+ goto out_unregister;
+
+ /* Final step: expose the device/driver to userspace */
+ ret = drm_dev_register(&vgem_device->drm, 0);
+ if (ret)
+ goto out_fini;
+
+ return 0;
+
+out_fini:
+ drm_dev_fini(&vgem_device->drm);
+out_unregister:
+ platform_device_unregister(vgem_device->platform);
+out_free:
+ kfree(vgem_device);
+ return ret;
+}
+
+static void __exit vgem_exit(void)
+{
+ drm_dev_unregister(&vgem_device->drm);
+ drm_dev_put(&vgem_device->drm);
+}
+
+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/marvell/linux/drivers/gpu/drm/vgem/vgem_drv.h b/marvell/linux/drivers/gpu/drm/vgem/vgem_drv.h
new file mode 100644
index 0000000..0ed3003
--- /dev/null
+++ b/marvell/linux/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/marvell/linux/drivers/gpu/drm/vgem/vgem_fence.c b/marvell/linux/drivers/gpu/drm/vgem/vgem_fence.c
new file mode 100644
index 0000000..9289593
--- /dev/null
+++ b/marvell/linux/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;
+ 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;
+ if (!dma_resv_test_signaled_rcu(resv,
+ arg->flags & VGEM_FENCE_WRITE)) {
+ ret = -EBUSY;
+ goto err_fence;
+ }
+
+ /* Expose the fence via the dma-buf */
+ ret = 0;
+ dma_resv_lock(resv, NULL);
+ if (arg->flags & VGEM_FENCE_WRITE)
+ dma_resv_add_excl_fence(resv, fence);
+ else if ((ret = dma_resv_reserve_shared(resv, 1)) == 0)
+ dma_resv_add_shared_fence(resv, fence);
+ 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_unlocked(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(&vfile->fence_idr);
+
+ 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);
+}