By exporting the ability to map user address and inserting PTEs
representing their backing pages into the GTT, we can exploit UMA in order
to utilize normal application data as a texture source or even as a
render target (depending upon the capabilities of the chipset). This has
a number of uses, with zero-copy downloads to the GPU and efficient
readback making the intermixed streaming of CPU and GPU operations
fairly efficient. This ability has many widespread implications from
faster rendering of client-side software rasterisers (chromium),
mitigation of stalls due to read back (firefox) and to faster pipelining
of texture data (such as pixel buffer objects in GL or data blobs in CL).
v2: Compile with CONFIG_MMU_NOTIFIER
v3: We can sleep while performing invalidate-range, which we can utilise
to drop our page references prior to the kernel manipulating the vma
(for either discard or cloning) and so protect normal users.
v4: Only run the invalidate notifier if the range intercepts the bo.
v5: Prevent userspace from attempting to GTT mmap non-page aligned buffers
v6: Recheck after reacquire mutex for lost mmu.
v7: Fix implicit padding of ioctl struct by rounding to next 64bit boundary.
v8: Fix rebasing error after forwarding porting the back port.
v9: Limit the userptr to page aligned entries. We now expect userspace
to handle all the offset-in-page adjustments itself.
v10: Prevent vma from being copied across fork to avoid issues with cow.
NB: We still have performance concerns over the use of the linear lists
and unfiltered notifies in mmu_notifier which do not scale to our use
case, where we may have many thousands of objects being tracked.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/Makefile | 1 +
drivers/gpu/drm/i915/i915_dma.c | 1 +
drivers/gpu/drm/i915/i915_drv.h | 18 +-
drivers/gpu/drm/i915/i915_gem.c | 3 +
drivers/gpu/drm/i915/i915_gem_userptr.c | 416 +++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/i915_gpu_error.c | 2 +
include/uapi/drm/i915_drm.h | 16 ++
7 files changed, 456 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/i915/i915_gem_userptr.c
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 9d498e5..2369cfe 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -16,6 +16,7 @@ i915-y := i915_drv.o i915_dma.o i915_irq.o \
i915_gem_gtt.o \
i915_gem_stolen.o \
i915_gem_tiling.o \
+ i915_gem_userptr.o \
i915_sysfs.o \
i915_trace_points.o \
i915_ums.o \
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 3cab741..23a9374 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1894,6 +1894,7 @@ const struct drm_ioctl_desc i915_ioctls[] = {
DRM_IOCTL_DEF_DRV(I915_GEM_CONTEXT_DESTROY, i915_gem_context_destroy_ioctl, DRM_UNLOCKED),
DRM_IOCTL_DEF_DRV(I915_REG_READ, i915_reg_read_ioctl, DRM_UNLOCKED),
DRM_IOCTL_DEF_DRV(I915_GEM_CREATE2, i915_gem_create2_ioctl, DRM_AUTH|DRM_UNLOCKED),
+ DRM_IOCTL_DEF_DRV(I915_GEM_USERPTR, i915_gem_userptr_ioctl, DRM_UNLOCKED),
};
int i915_max_ioctl = DRM_ARRAY_SIZE(i915_ioctls);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index c2da7e9..d6c6626 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -43,6 +43,7 @@
#include <linux/intel-iommu.h>
#include <linux/kref.h>
#include <linux/pm_qos.h>
+#include <linux/mmu_notifier.h>
/* General customization:
*/
@@ -320,6 +321,7 @@ struct drm_i915_error_state {
u32 tiling:2;
u32 dirty:1;
u32 purgeable:1;
+ u32 userptr:1;
s32 ring:4;
u32 cache_level:2;
} **active_bo, **pinned_bo;
@@ -1296,6 +1298,7 @@ struct drm_i915_gem_object_ops {
*/
int (*get_pages)(struct drm_i915_gem_object *);
void (*put_pages)(struct drm_i915_gem_object *);
+ void (*release)(struct drm_i915_gem_object *);
};
struct drm_i915_gem_object {
@@ -1425,9 +1428,20 @@ struct drm_i915_gem_object {
/** for phy allocated objects */
struct drm_i915_gem_phys_object *phys_obj;
+
+ union {
+ struct i915_gem_userptr {
+ uintptr_t ptr;
+ bool read_only;
+
+ struct mm_struct *mm;
+#if defined(CONFIG_MMU_NOTIFIER)
+ struct mmu_notifier mn;
+#endif
+ } userptr;
+ };
};
#define to_gem_object(obj) (&((struct drm_i915_gem_object *)(obj))->base)
-
#define to_intel_bo(x) container_of(x, struct drm_i915_gem_object, base)
/**
@@ -1733,6 +1747,8 @@ int i915_gem_set_tiling_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv);
int i915_gem_get_tiling_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv);
+int i915_gem_userptr_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file);
int i915_gem_get_aperture_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv);
int i915_gem_wait_ioctl(struct drm_device *dev, void *data,
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index af7b8f4..0244c3e 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4200,6 +4200,9 @@ void i915_gem_free_object(struct drm_gem_object *gem_obj)
if (obj->base.import_attach)
drm_prime_gem_destroy(&obj->base, NULL);
+ if (obj->ops->release)
+ obj->ops->release(obj);
+
drm_gem_object_release(&obj->base);
i915_gem_info_remove_obj(dev_priv, obj->base.size);
diff --git a/drivers/gpu/drm/i915/i915_gem_userptr.c b/drivers/gpu/drm/i915/i915_gem_userptr.c
new file mode 100644
index 0000000..3859ad3
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_gem_userptr.c
@@ -0,0 +1,416 @@
+/*
+ * Copyright © 2012 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
+ * 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.
+ *
+ */
+
+#include "drmP.h"
+#include "i915_drm.h"
+#include "i915_drv.h"
+#include "i915_trace.h"
+#include "intel_drv.h"
+#include <linux/mmu_notifier.h>
+#include <linux/mempolicy.h>
+#include <linux/swap.h>
+
+#if defined(CONFIG_MMU_NOTIFIER)
+static void i915_gem_userptr_mn_invalidate_range_start(struct mmu_notifier *mn,
+ struct mm_struct *mm,
+ unsigned long start,
+ unsigned long end)
+{
+ struct drm_i915_gem_object *obj;
+ struct drm_device *dev;
+
+ /* XXX race between obj unref and mmu notifier? */
+ obj = container_of(mn, struct drm_i915_gem_object, userptr.mn);
+ BUG_ON(obj->userptr.mm != mm);
+
+ if (obj->userptr.ptr >= end ||
+ obj->userptr.ptr + obj->base.size <= start)
+ return;
+
+ if (obj->pages == NULL) /* opportunistic check */
+ return;
+
+ dev = obj->base.dev;
+ mutex_lock(&dev->struct_mutex);
+ if (i915_gem_obj_bound_any(obj)) {
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct i915_vma *vma;
+ bool was_interruptible;
+ int ret;
+
+ was_interruptible = dev_priv->mm.interruptible;
+ dev_priv->mm.interruptible = false;
+
+ list_for_each_entry(vma, &obj->vma_list, vma_link) {
+ ret = i915_vma_unbind(vma);
+ WARN_ON(ret && ret != -EIO);
+ }
+
+ dev_priv->mm.interruptible = was_interruptible;
+ }
+
+ WARN_ON(i915_gem_object_put_pages(obj));
+ mutex_unlock(&dev->struct_mutex);
+}
+
+static void i915_gem_userptr_mn_release(struct mmu_notifier *mn,
+ struct mm_struct *mm)
+{
+ struct drm_i915_gem_object *obj;
+
+ obj = container_of(mn, struct drm_i915_gem_object, userptr.mn);
+ BUG_ON(obj->userptr.mm != mm);
+ obj->userptr.mm = NULL;
+
+ /* XXX Schedule an eventual unbind? E.g. hook into require request?
+ * However, locking will be complicated.
+ */
+}
+
+static const struct mmu_notifier_ops i915_gem_userptr_notifier = {
+ .invalidate_range_start = i915_gem_userptr_mn_invalidate_range_start,
+ .release = i915_gem_userptr_mn_release,
+};
+
+static void
+i915_gem_userptr_release__mmu_notifier(struct drm_i915_gem_object *obj)
+{
+ if (obj->userptr.mn.ops && obj->userptr.mm) {
+ mmu_notifier_unregister(&obj->userptr.mn, obj->userptr.mm);
+ obj->userptr.mm = NULL;
+ }
+}
+
+static int
+i915_gem_userptr_init__mmu_notifier(struct drm_i915_gem_object *obj,
+ unsigned flags)
+{
+ if (flags & I915_USERPTR_UNSYNCHRONIZED)
+ return capable(CAP_SYS_ADMIN) ? 0 : -EPERM;
+
+ obj->userptr.mn.ops = &i915_gem_userptr_notifier;
+ return mmu_notifier_register(&obj->userptr.mn, obj->userptr.mm);
+}
+
+#else
+
+static void
+i915_gem_userptr_release__mmu_notifier(struct drm_i915_gem_object *obj)
+{
+}
+
+static int
+i915_gem_userptr_init__mmu_notifier(struct drm_i915_gem_object *obj,
+ unsigned flags)
+{
+ if ((flags & I915_USERPTR_UNSYNCHRONIZED) == 0)
+ return -ENODEV;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ return 0;
+}
+#endif
+
+static int
+__i915_gem_userptr_set_vma_behaviour(struct drm_i915_gem_object *obj,
+ unsigned behaviour)
+{
+ struct mm_struct *mm = obj->userptr.mm;
+ unsigned long start = obj->userptr.ptr;
+ unsigned long end = start + obj->base.size;
+ struct vm_area_struct *vma, *prev;
+ unsigned new_flags;
+ int ret = 0;
+
+ down_write(&mm->mmap_sem);
+
+ vma = find_vma_prev(mm, start, &prev);
+ if (vma && start > vma->vm_start)
+ prev = vma;
+
+ new_flags = vma->vm_flags;
+ switch (behaviour) {
+ case MADV_DOFORK:
+ new_flags &= ~VM_DONTCOPY;
+ break;
+ case MADV_DONTFORK:
+ new_flags |= VM_DONTCOPY;
+ break;
+ }
+ if (vma->vm_flags == new_flags)
+ goto unlock;
+
+ prev = vma_merge(mm, prev, start, end, new_flags,
+ vma->anon_vma, vma->vm_file,
+ vma->vm_pgoff + ((start - vma->vm_start) >> PAGE_SHIFT),
+ vma_policy(vma));
+ if (prev) {
+ vma = prev;
+ } else {
+ if (start != vma->vm_start) {
+ ret = split_vma(mm, vma, start, 1);
+ if (ret)
+ goto unlock;
+ }
+
+ if (end != vma->vm_end) {
+ ret = split_vma(mm, vma, end, 0);
+ if (ret)
+ goto unlock;
+ }
+ }
+
+ vma->vm_flags = new_flags;
+
+unlock:
+ up_write(&mm->mmap_sem);
+ return ret;
+}
+
+static int
+i915_gem_userptr_init__vma_behaviour(struct drm_i915_gem_object *obj,
+ unsigned flags)
+{
+ if (flags & I915_USERPTR_UNSYNCHRONIZED)
+ return 0;
+
+ return __i915_gem_userptr_set_vma_behaviour(obj, MADV_DONTFORK);
+}
+
+static int
+i915_gem_userptr_release__vma_behaviour(struct drm_i915_gem_object *obj)
+{
+ /* XXX How to track/prevent user changes? */
+ return __i915_gem_userptr_set_vma_behaviour(obj, MADV_DOFORK);
+}
+
+static int
+i915_gem_userptr_get_pages(struct drm_i915_gem_object *obj)
+{
+ int num_pages = obj->base.size >> PAGE_SHIFT;
+ struct sg_table *st;
+ struct scatterlist *sg;
+ struct page **pvec;
+ int n, pinned, ret;
+
+ if (obj->userptr.mm == NULL)
+ return -EFAULT;
+
+ if (!access_ok(obj->userptr.read_only ? VERIFY_READ : VERIFY_WRITE,
+ (char __user *)obj->userptr.ptr, obj->base.size))
+ return -EFAULT;
+
+ /* If userspace should engineer that these pages are replaced in
+ * the vma between us binding this page into the GTT and completion
+ * of rendering... Their loss. If they change the mapping of their
+ * pages they need to create a new bo to point to the new vma.
+ *
+ * However, that still leaves open the possibility of the vma
+ * being copied upon fork. Which falls under the same userspace
+ * synchronisation issue as a regular bo, except that this time
+ * the process may not be expecting that a particular piece of
+ * memory is tied to the GPU.
+ *
+ * Fortunately, we can hook into the mmu_notifier in order to
+ * discard the page references prior to anything nasty happening
+ * to the vma (discard or cloning) which should prevent the more
+ * egregious cases from causing harm.
+ */
+
+ pvec = kmalloc(num_pages*sizeof(struct page *),
+ GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
+ if (pvec == NULL) {
+ pvec = drm_malloc_ab(num_pages, sizeof(struct page *));
+ if (pvec == NULL)
+ return -ENOMEM;
+ }
+
+ pinned = 0;
+ if (obj->userptr.mm == current->mm)
+ pinned = __get_user_pages_fast(obj->userptr.ptr, num_pages,
+ !obj->userptr.read_only, pvec);
+ if (pinned < num_pages) {
+ struct mm_struct *mm = obj->userptr.mm;
+
+ mutex_unlock(&obj->base.dev->struct_mutex);
+ down_read(&mm->mmap_sem);
+
+ ret = get_user_pages(current, mm,
+ obj->userptr.ptr + (pinned << PAGE_SHIFT),
+ num_pages - pinned,
+ !obj->userptr.read_only, 0,
+ pvec + pinned,
+ NULL);
+
+ up_read(&mm->mmap_sem);
+ mutex_lock(&obj->base.dev->struct_mutex);
+
+ if (ret > 0)
+ pinned += ret;
+
+ if (obj->userptr.mm == NULL || obj->pages || pinned < num_pages) {
+ ret = obj->pages ? 0 : -EFAULT;
+ goto cleanup_pinned;
+ }
+ }
+
+ st = kmalloc(sizeof(*st), GFP_KERNEL);
+ if (st == NULL) {
+ ret = -ENOMEM;
+ goto cleanup_pinned;
+ }
+
+ if (sg_alloc_table(st, num_pages, GFP_KERNEL)) {
+ ret = -ENOMEM;
+ goto cleanup_st;
+ }
+
+ for_each_sg(st->sgl, sg, num_pages, n)
+ sg_set_page(sg, pvec[n], PAGE_SIZE, 0);
+ drm_free_large(pvec);
+
+ obj->pages = st;
+ return 0;
+
+cleanup_st:
+ kfree(st);
+cleanup_pinned:
+ release_pages(pvec, pinned, 0);
+ drm_free_large(pvec);
+ return ret;
+}
+
+static void
+i915_gem_userptr_put_pages(struct drm_i915_gem_object *obj)
+{
+ struct scatterlist *sg;
+ int i;
+
+ if (obj->madv != I915_MADV_WILLNEED)
+ obj->dirty = 0;
+
+ for_each_sg(obj->pages->sgl, sg, obj->pages->nents, i) {
+ struct page *page = sg_page(sg);
+
+ if (obj->dirty)
+ set_page_dirty(page);
+
+ mark_page_accessed(page);
+ page_cache_release(page);
+ }
+ obj->dirty = 0;
+
+ sg_free_table(obj->pages);
+ kfree(obj->pages);
+}
+
+static void
+i915_gem_userptr_release(struct drm_i915_gem_object *obj)
+{
+ i915_gem_userptr_release__mmu_notifier(obj);
+ i915_gem_userptr_release__vma_behaviour(obj);
+}
+
+static const struct drm_i915_gem_object_ops i915_gem_userptr_ops = {
+ .get_pages = i915_gem_userptr_get_pages,
+ .put_pages = i915_gem_userptr_put_pages,
+ .release = i915_gem_userptr_release,
+};
+
+/**
+ * Creates a new mm object that wraps some user memory.
+ *
+ * We impose several restrictions upon the memory being mapped
+ * into the GPU.
+ * 1. It must be page aligned (both start/end addresses, i.e ptr and size).
+ * 2. We mark the pages as MADV_DONTFORK so that they will not be cloned
+ * to child processes.
+ * 3. We only allow a bo as large as we could in theory map into the GTT,
+ * that is we limit the size to the size of the GTT.
+ * 4. The bo is marked as being snoopable.
+ *
+ * Synchronisation between multiple users and the GPU is left to userspace
+ * through the normal set-domain-ioctl. The kernel will enforce that the
+ * GPU relinquishes the VMA before it is returned back to the system
+ * i.e. upon free(), munmap() or process termination. However, the userspace
+ * malloc() library may not immediately relinquish the VMA after free() and
+ * instead reuse it whilst the GPU is still reading and writing to the VMA.
+ * Caveat emptor.
+ *
+ * If you think this is a good interface to use to pass GPU memory between
+ * drivers, please use dma-buf instead. In fact, wherever possible use
+ * dma-buf instead.
+ */
+int
+i915_gem_userptr_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct drm_i915_gem_userptr *args = data;
+ struct drm_i915_gem_object *obj;
+ int ret;
+ u32 handle;
+
+ if (args->flags & ~(I915_USERPTR_READ_ONLY |
+ I915_USERPTR_UNSYNCHRONIZED))
+ return -EINVAL;
+
+ if (offset_in_page(args->user_ptr | args->user_size))
+ return -EINVAL;
+
+ if (args->user_size > dev_priv->gtt.mappable_end)
+ return -E2BIG;
+
+ /* Allocate the new object */
+ obj = i915_gem_object_alloc(dev);
+ if (obj == NULL)
+ return -ENOMEM;
+
+ drm_gem_private_object_init(dev, &obj->base, args->user_size);
+ i915_gem_object_init(obj, &i915_gem_userptr_ops);
+ obj->cache_level = I915_CACHE_LLC;
+
+ obj->userptr.ptr = args->user_ptr;
+ obj->userptr.read_only = !!(args->flags & I915_USERPTR_READ_ONLY);
+
+ /* And keep a pointer to the current->mm for resolving the user pages
+ * at binding. This means that we need to hook into the mmu_notifier
+ * in order to detect if the mmu is destroyed.
+ */
+ obj->userptr.mm = current->mm;
+ ret = i915_gem_userptr_init__mmu_notifier(obj, args->flags);
+ if (ret == 0)
+ ret = i915_gem_userptr_init__vma_behaviour(obj, args->flags);
+ if (ret == 0)
+ ret = drm_gem_handle_create(file, &obj->base, &handle);
+
+ /* drop reference from allocate - handle holds it now */
+ drm_gem_object_unreference(&obj->base);
+ if (ret)
+ return ret;
+
+ args->handle = handle;
+ return 0;
+}
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 558e568..fe47274 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -199,6 +199,7 @@ static void print_error_buffers(struct drm_i915_error_state_buf *m,
err_puts(m, tiling_flag(err->tiling));
err_puts(m, dirty_flag(err->dirty));
err_puts(m, purgeable_flag(err->purgeable));
+ err_puts(m, err->userptr ? " userptr" : "");
err_puts(m, err->ring != -1 ? " " : "");
err_puts(m, ring_str(err->ring));
err_puts(m, i915_cache_level_str(err->cache_level));
@@ -554,6 +555,7 @@ static void capture_bo(struct drm_i915_error_buffer *err,
err->tiling = obj->tiling_mode;
err->dirty = obj->dirty;
err->purgeable = obj->madv != I915_MADV_WILLNEED;
+ err->userptr = obj->userptr.mm != 0;
err->ring = obj->ring ? obj->ring->id : -1;
err->cache_level = obj->cache_level;
}
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 9a1cfba..6d5f963 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -223,6 +223,7 @@ typedef struct _drm_i915_sarea {
#define DRM_I915_GEM_GET_CACHING 0x30
#define DRM_I915_REG_READ 0x31
#define DRM_I915_GEM_CREATE2 0x32
+#define DRM_I915_GEM_USERPTR 0x33
#define DRM_IOCTL_I915_INIT DRM_IOW( DRM_COMMAND_BASE + DRM_I915_INIT, drm_i915_init_t)
#define DRM_IOCTL_I915_FLUSH DRM_IO ( DRM_COMMAND_BASE + DRM_I915_FLUSH)
@@ -273,6 +274,7 @@ typedef struct _drm_i915_sarea {
#define DRM_IOCTL_I915_GEM_CONTEXT_CREATE DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_CONTEXT_CREATE, struct drm_i915_gem_context_create)
#define DRM_IOCTL_I915_GEM_CONTEXT_DESTROY DRM_IOW (DRM_COMMAND_BASE + DRM_I915_GEM_CONTEXT_DESTROY, struct drm_i915_gem_context_destroy)
#define DRM_IOCTL_I915_REG_READ DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_REG_READ, struct drm_i915_reg_read)
+#define DRM_IOCTL_I915_GEM_USERPTR DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_USERPTR, struct drm_i915_gem_userptr)
/* Allow drivers to submit batchbuffers directly to hardware, relying
* on the security mechanisms provided by hardware.
@@ -1110,4 +1112,18 @@ struct drm_i915_reg_read {
__u64 offset;
__u64 val; /* Return value */
};
+
+struct drm_i915_gem_userptr {
+ __u64 user_ptr;
+ __u64 user_size;
+ __u32 flags;
+#define I915_USERPTR_READ_ONLY 0x1
+#define I915_USERPTR_UNSYNCHRONIZED 0x80000000
+ /**
+ * Returned handle for the object.
+ *
+ * Object handles are nonzero.
+ */
+ __u32 handle;
+};
#endif /* _UAPI_I915_DRM_H_ */
--
1.7.9.5
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