On Mon, Jun 16, 2014 at 08:59:05PM +0530, sourab.gupta@xxxxxxxxx wrote:
> From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
>
> Despite being a unified memory architecture (UMA) some bits of memory
> are more equal than others. In particular we have the thorny issue of
> stolen memory, memory stolen from the system by the BIOS and reserved
> for igfx use. Stolen memory is required for some functions of the GPU
> and display engine, but in general it goes wasted. Whilst we cannot
> return it back to the system, we need to find some other method for
> utilising it. As we do not support direct access to the physical address
> in the stolen region, it behaves like a different class of memory,
> closer in kin to local GPU memory. This strongly suggests that we need a
> placement model like TTM if we are to fully utilize these discrete
> chunks of differing memory.
>
> This new create ioctl therefore exists to allow the user to create these
> second class buffer objects from stolen memory. At the moment direct
> access by the CPU through mmaps and pread/pwrite are verboten on the
> objects, and so the user must be aware of the limitations of the objects
> created. Yet, those limitations rarely reduce the desired functionality
> in many use cases and so the user should be able to easily fill the
> stolen memory and so help to reduce overall memory pressure.
>
> The most obvious use case for stolen memory is for the creation of objects
> for the display engine which already have very similar restrictions on
> access. However, we want a reasonably general ioctl in order to cater
> for diverse scenarios beyond the author's imagination.
>
> v2: Expand the struct slightly to include cache domains, and ensure that
> all memory allocated by the kernel for userspace is zeroed.
>
> v3: Ben suggested the idea of binding the object at a known offset into
> the target context upon creation.
>
> testcase: igt/gem_create2
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Sourab Gupta <sourab.gupta@xxxxxxxxx>
What about those ioctls() losing DRM_AUTH?
--
Damien
> ---
> drivers/gpu/drm/i915/i915_dma.c | 11 +-
> drivers/gpu/drm/i915/i915_drv.h | 15 ++-
> drivers/gpu/drm/i915/i915_gem.c | 208 ++++++++++++++++++++++++++++++---
> drivers/gpu/drm/i915/i915_gem_tiling.c | 106 +++++++++--------
> include/uapi/drm/i915_drm.h | 107 +++++++++++++++++
> 5 files changed, 373 insertions(+), 74 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
> index aadb0c9..f101d49 100644
> --- a/drivers/gpu/drm/i915/i915_dma.c
> +++ b/drivers/gpu/drm/i915/i915_dma.c
> @@ -1996,10 +1996,10 @@ const struct drm_ioctl_desc i915_ioctls[] = {
> DRM_IOCTL_DEF_DRV(I915_GEM_EXECBUFFER2, i915_gem_execbuffer2, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
> DRM_IOCTL_DEF_DRV(I915_GEM_PIN, i915_gem_pin_ioctl, DRM_AUTH|DRM_ROOT_ONLY|DRM_UNLOCKED),
> DRM_IOCTL_DEF_DRV(I915_GEM_UNPIN, i915_gem_unpin_ioctl, DRM_AUTH|DRM_ROOT_ONLY|DRM_UNLOCKED),
> - DRM_IOCTL_DEF_DRV(I915_GEM_BUSY, i915_gem_busy_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
> + DRM_IOCTL_DEF_DRV(I915_GEM_BUSY, i915_gem_busy_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
> DRM_IOCTL_DEF_DRV(I915_GEM_SET_CACHING, i915_gem_set_caching_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
> DRM_IOCTL_DEF_DRV(I915_GEM_GET_CACHING, i915_gem_get_caching_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
> - DRM_IOCTL_DEF_DRV(I915_GEM_THROTTLE, i915_gem_throttle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
> + DRM_IOCTL_DEF_DRV(I915_GEM_THROTTLE, i915_gem_throttle_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
> DRM_IOCTL_DEF_DRV(I915_GEM_ENTERVT, i915_gem_entervt_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY|DRM_UNLOCKED),
> DRM_IOCTL_DEF_DRV(I915_GEM_LEAVEVT, i915_gem_leavevt_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY|DRM_UNLOCKED),
> DRM_IOCTL_DEF_DRV(I915_GEM_CREATE, i915_gem_create_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
> @@ -2009,8 +2009,8 @@ const struct drm_ioctl_desc i915_ioctls[] = {
> DRM_IOCTL_DEF_DRV(I915_GEM_MMAP_GTT, i915_gem_mmap_gtt_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
> DRM_IOCTL_DEF_DRV(I915_GEM_SET_DOMAIN, i915_gem_set_domain_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
> DRM_IOCTL_DEF_DRV(I915_GEM_SW_FINISH, i915_gem_sw_finish_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
> - DRM_IOCTL_DEF_DRV(I915_GEM_SET_TILING, i915_gem_set_tiling, DRM_UNLOCKED|DRM_RENDER_ALLOW),
> - DRM_IOCTL_DEF_DRV(I915_GEM_GET_TILING, i915_gem_get_tiling, DRM_UNLOCKED|DRM_RENDER_ALLOW),
> + DRM_IOCTL_DEF_DRV(I915_GEM_SET_TILING, i915_gem_set_tiling_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
> + DRM_IOCTL_DEF_DRV(I915_GEM_GET_TILING, i915_gem_get_tiling_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
> DRM_IOCTL_DEF_DRV(I915_GEM_GET_APERTURE, i915_gem_get_aperture_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
> DRM_IOCTL_DEF_DRV(I915_GET_PIPE_FROM_CRTC_ID, intel_get_pipe_from_crtc_id, DRM_UNLOCKED),
> DRM_IOCTL_DEF_DRV(I915_GEM_MADVISE, i915_gem_madvise_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
> @@ -2018,12 +2018,13 @@ const struct drm_ioctl_desc i915_ioctls[] = {
> DRM_IOCTL_DEF_DRV(I915_OVERLAY_ATTRS, intel_overlay_attrs, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
> DRM_IOCTL_DEF_DRV(I915_SET_SPRITE_COLORKEY, intel_sprite_set_colorkey, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
> DRM_IOCTL_DEF_DRV(I915_GET_SPRITE_COLORKEY, intel_sprite_get_colorkey, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
> - DRM_IOCTL_DEF_DRV(I915_GEM_WAIT, i915_gem_wait_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
> + DRM_IOCTL_DEF_DRV(I915_GEM_WAIT, i915_gem_wait_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
> DRM_IOCTL_DEF_DRV(I915_GEM_CONTEXT_CREATE, i915_gem_context_create_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
> DRM_IOCTL_DEF_DRV(I915_GEM_CONTEXT_DESTROY, i915_gem_context_destroy_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
> DRM_IOCTL_DEF_DRV(I915_REG_READ, i915_reg_read_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
> DRM_IOCTL_DEF_DRV(I915_GET_RESET_STATS, i915_get_reset_stats_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
> DRM_IOCTL_DEF_DRV(I915_GEM_USERPTR, i915_gem_userptr_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
> + DRM_IOCTL_DEF_DRV(I915_GEM_CREATE2, i915_gem_create2_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
> };
>
> int i915_max_ioctl = ARRAY_SIZE(i915_ioctls);
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 0cdd4d7..b097d6e 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -2104,6 +2104,8 @@ int i915_gem_init_ioctl(struct drm_device *dev, void *data,
> struct drm_file *file_priv);
> int i915_gem_create_ioctl(struct drm_device *dev, void *data,
> struct drm_file *file_priv);
> +int i915_gem_create2_ioctl(struct drm_device *dev, void *data,
> + struct drm_file *file_priv);
> int i915_gem_pread_ioctl(struct drm_device *dev, void *data,
> struct drm_file *file_priv);
> int i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
> @@ -2138,10 +2140,10 @@ int i915_gem_entervt_ioctl(struct drm_device *dev, void *data,
> struct drm_file *file_priv);
> int i915_gem_leavevt_ioctl(struct drm_device *dev, void *data,
> struct drm_file *file_priv);
> -int i915_gem_set_tiling(struct drm_device *dev, void *data,
> - struct drm_file *file_priv);
> -int i915_gem_get_tiling(struct drm_device *dev, void *data,
> - struct drm_file *file_priv);
> +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_init_userptr(struct drm_device *dev);
> int i915_gem_userptr_ioctl(struct drm_device *dev, void *data,
> struct drm_file *file);
> @@ -2264,6 +2266,8 @@ static inline bool i915_stop_ring_allow_warn(struct drm_i915_private *dev_priv)
>
> void i915_gem_reset(struct drm_device *dev);
> bool i915_gem_clflush_object(struct drm_i915_gem_object *obj, bool force);
> +int __must_check i915_gem_object_set_tiling(struct drm_i915_gem_object *obj,
> + int tiling_mode, int pitch);
> int __must_check i915_gem_object_finish_gpu(struct drm_i915_gem_object *obj);
> int __must_check i915_gem_init(struct drm_device *dev);
> int __must_check i915_gem_init_hw(struct drm_device *dev);
> @@ -2296,6 +2300,9 @@ int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj,
> int i915_gem_open(struct drm_device *dev, struct drm_file *file);
> void i915_gem_release(struct drm_device *dev, struct drm_file *file);
>
> +bool
> +i915_tiling_ok(struct drm_device *dev, int stride, int size, int tiling_mode);
> +
> uint32_t
> i915_gem_get_gtt_size(struct drm_device *dev, uint32_t size, int tiling_mode);
> uint32_t
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index 1794a04..16543c2 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -53,6 +53,14 @@ static void i915_gem_object_update_fence(struct drm_i915_gem_object *obj,
> struct drm_i915_fence_reg *fence,
> bool enable);
>
> +#define PIN_OFFSET_VALID 0x1
> +static struct i915_vma *
> +i915_gem_object_bind_to_vm(struct drm_i915_gem_object *obj,
> + struct i915_address_space *vm,
> + uint64_t offset,
> + unsigned alignment,
> + uint64_t flags);
> +
> static unsigned long i915_gem_shrinker_count(struct shrinker *shrinker,
> struct shrink_control *sc);
> static unsigned long i915_gem_shrinker_scan(struct shrinker *shrinker,
> @@ -380,8 +388,7 @@ i915_gem_dumb_create(struct drm_file *file,
> /* have to work out size/pitch and return them */
> args->pitch = ALIGN(args->width * DIV_ROUND_UP(args->bpp, 8), 64);
> args->size = args->pitch * args->height;
> - return i915_gem_create(file, dev,
> - args->size, &args->handle);
> + return i915_gem_create(file, dev, args->size, &args->handle);
> }
>
> /**
> @@ -392,9 +399,155 @@ i915_gem_create_ioctl(struct drm_device *dev, void *data,
> struct drm_file *file)
> {
> struct drm_i915_gem_create *args = data;
> + return i915_gem_create(file, dev, args->size, &args->handle);
> +}
> +
> +int
> +i915_gem_create2_ioctl(struct drm_device *dev, void *data,
> + struct drm_file *file)
> +{
> + struct drm_i915_gem_create2 *args = data;
> + struct drm_i915_gem_object *obj;
> + unsigned cache_level;
> + enum {
> + ASYNC_CLEAR = 0x1,
> + } flags = 0;
> + int ret;
> +
> + if (args->pad)
> + return -EINVAL;
> +
> + if (args->flags & ~(0))
> + return -EINVAL;
> +
> + if (!i915_tiling_ok(dev, args->stride, args->size, args->tiling_mode))
> + return -EINVAL;
> +
> + switch (args->domain) {
> + case 0:
> + case I915_GEM_DOMAIN_CPU:
> + case I915_GEM_DOMAIN_GTT:
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + switch (args->caching) {
> + case I915_CACHING_NONE:
> + cache_level = I915_CACHE_NONE;
> + break;
> + case I915_CACHING_CACHED:
> + cache_level = I915_CACHE_LLC;
> + break;
> + case I915_CACHING_DISPLAY:
> + cache_level = HAS_WT(dev) ? I915_CACHE_WT : I915_CACHE_NONE;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + switch (args->madvise) {
> + case I915_MADV_DONTNEED:
> + case I915_MADV_WILLNEED:
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + if (args->size == 0 || args->size & 4095)
> + return -EINVAL;
> +
> + ret = i915_mutex_lock_interruptible(dev);
> + if (ret)
> + return ret;
> +
> + obj = NULL;
> + switch (args->placement) {
> + case I915_CREATE_PLACEMENT_SYSTEM:
> + obj = i915_gem_alloc_object(dev, args->size);
> + break;
> + case I915_CREATE_PLACEMENT_STOLEN:
> + obj = i915_gem_object_create_stolen(dev, args->size);
> + flags |= ASYNC_CLEAR;
> + break;
> + default:
> + ret = -EINVAL;
> + goto unlock;
> + }
> + if (obj == NULL) {
> + ret = -ENOMEM;
> + goto unlock;
> + }
> +
> + ret = i915_gem_object_set_cache_level(obj, cache_level);
> + if (ret)
> + goto err;
> +
> + ret = i915_gem_object_set_tiling(obj, args->tiling_mode, args->stride);
> + if (ret)
> + goto err;
>
> - return i915_gem_create(file, dev,
> - args->size, &args->handle);
> + if (args->offset & I915_CREATE_OFFSET_VALID) {
> + struct intel_context *ctx;
> + struct i915_vma *vma;
> +
> + ctx = i915_gem_context_get(file->driver_priv, args->context);
> + if (IS_ERR(ctx)) {
> + ret = PTR_ERR(ctx);
> + goto err;
> + }
> +
> + vma = i915_gem_obj_to_vma(obj, ctx->vm);
> + if (vma && drm_mm_node_allocated(&vma->node)) {
> + if (vma->node.start != (args->offset &
> + ~I915_CREATE_OFFSET_VALID)) {
> + ret = i915_vma_unbind(vma);
> + if (ret)
> + goto err;
> +
> + vma = NULL;
> + }
> + }
> +
> + if (vma == NULL || !drm_mm_node_allocated(&vma->node)) {
> + vma = i915_gem_object_bind_to_vm(obj, ctx->vm,
> + args->offset, 0, flags);
> + if (IS_ERR(vma)) {
> + ret = PTR_ERR(vma);
> + goto err;
> + }
> + }
> + }
> +
> + if (flags & ASYNC_CLEAR) {
> + ret = i915_gem_exec_clear_object(obj);
> + if (ret)
> + goto err;
> + }
> +
> + if (args->domain) {
> + if (args->domain == I915_GEM_DOMAIN_GTT) {
> + ret = i915_gem_object_set_to_gtt_domain(obj, true);
> + if (ret == -EINVAL) /* unbound */
> + ret = 0;
> + } else {
> + ret = i915_gem_object_set_to_cpu_domain(obj, true);
> + }
> + if (ret)
> + goto err;
> + }
> +
> + ret = drm_gem_handle_create(file, &obj->base, &args->handle);
> + if (ret)
> + goto err;
> +
> + obj->madv = args->madvise;
> + trace_i915_gem_object_create(obj);
> +err:
> + drm_gem_object_unreference(&obj->base);
> +unlock:
> + mutex_unlock(&dev->struct_mutex);
> + return ret;
> }
>
> static inline int
> @@ -3383,6 +3536,7 @@ static void i915_gem_verify_gtt(struct drm_device *dev)
> static struct i915_vma *
> i915_gem_object_bind_to_vm(struct drm_i915_gem_object *obj,
> struct i915_address_space *vm,
> + uint64_t offset,
> unsigned alignment,
> uint64_t flags)
> {
> @@ -3438,22 +3592,38 @@ i915_gem_object_bind_to_vm(struct drm_i915_gem_object *obj,
> if (IS_ERR(vma))
> goto err_unpin;
>
> + if (offset & PIN_OFFSET_VALID) {
> + offset &= ~PIN_OFFSET_VALID;
> + if (alignment && offset & (alignment - 1)) {
> + vma = ERR_PTR(-EINVAL);
> + goto err_free_vma;
> + }
> +
> + vma->node.start = offset;
> + vma->node.size = size;
> + vma->node.color = obj->cache_level;
> + ret = drm_mm_reserve_node(&vm->mm, &vma->node);
> + if (ret) {
> + vma = ERR_PTR(ret);
> + goto err_free_vma;
> + }
> + } else {
> search_free:
> - ret = drm_mm_insert_node_in_range_generic(&vm->mm, &vma->node,
> - size, alignment,
> - obj->cache_level,
> - start, end,
> - DRM_MM_SEARCH_DEFAULT,
> - DRM_MM_CREATE_DEFAULT);
> - if (ret) {
> - ret = i915_gem_evict_something(dev, vm, size, alignment,
> - obj->cache_level,
> - start, end,
> - flags);
> - if (ret == 0)
> - goto search_free;
> + ret = drm_mm_insert_node_in_range_generic(&vm->mm, &vma->node,
> + size, alignment,
> + obj->cache_level,
> + start, end,
> + DRM_MM_SEARCH_DEFAULT,
> + DRM_MM_CREATE_DEFAULT);
> + if (ret) {
> + ret = i915_gem_evict_something(dev, vm, size, alignment,
> + obj->cache_level,
> + start, end, flags);
> + if (ret == 0)
> + goto search_free;
>
> - goto err_free_vma;
> + goto err_free_vma;
> + }
> }
> if (WARN_ON(!i915_gem_valid_gtt_space(dev, &vma->node,
> obj->cache_level))) {
> @@ -4081,7 +4251,7 @@ i915_gem_object_pin(struct drm_i915_gem_object *obj,
> }
>
> if (vma == NULL || !drm_mm_node_allocated(&vma->node)) {
> - vma = i915_gem_object_bind_to_vm(obj, vm, alignment, flags);
> + vma = i915_gem_object_bind_to_vm(obj, vm, 0, alignment, flags);
> if (IS_ERR(vma))
> return PTR_ERR(vma);
> }
> diff --git a/drivers/gpu/drm/i915/i915_gem_tiling.c b/drivers/gpu/drm/i915/i915_gem_tiling.c
> index cb150e8..683e0853 100644
> --- a/drivers/gpu/drm/i915/i915_gem_tiling.c
> +++ b/drivers/gpu/drm/i915/i915_gem_tiling.c
> @@ -201,7 +201,7 @@ i915_gem_detect_bit_6_swizzle(struct drm_device *dev)
> }
>
> /* Check pitch constriants for all chips & tiling formats */
> -static bool
> +bool
> i915_tiling_ok(struct drm_device *dev, int stride, int size, int tiling_mode)
> {
> int tile_width;
> @@ -285,12 +285,68 @@ i915_gem_object_fence_ok(struct drm_i915_gem_object *obj, int tiling_mode)
> return true;
> }
>
> +int
> +i915_gem_object_set_tiling(struct drm_i915_gem_object *obj,
> + int tiling_mode, int stride)
> +{
> + struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
> + int ret;
> +
> + if (tiling_mode == obj->tiling_mode && stride == obj->stride)
> + return 0;
> +
> + /* We need to rebind the object if its current allocation
> + * no longer meets the alignment restrictions for its new
> + * tiling mode. Otherwise we can just leave it alone, but
> + * need to ensure that any fence register is updated before
> + * the next fenced (either through the GTT or by the BLT unit
> + * on older GPUs) access.
> + *
> + * After updating the tiling parameters, we then flag whether
> + * we need to update an associated fence register. Note this
> + * has to also include the unfenced register the GPU uses
> + * whilst executing a fenced command for an untiled object.
> + */
> +
> + obj->map_and_fenceable =
> + !i915_gem_obj_ggtt_bound(obj) ||
> + ((i915_gem_obj_ggtt_offset(obj) + obj->base.size)
> + <= dev_priv->gtt.mappable_end &&
> + i915_gem_object_fence_ok(obj, tiling_mode));
> +
> + /* Rebind if we need a change of alignment */
> + ret = 0;
> + if (!obj->map_and_fenceable) {
> + u32 unfenced_alignment =
> + i915_gem_get_gtt_alignment(dev_priv->dev,
> + obj->base.size, tiling_mode,
> + false);
> + if (i915_gem_obj_ggtt_offset(obj) & (unfenced_alignment - 1))
> + ret = i915_gem_object_ggtt_unbind(obj);
> + }
> +
> + if (ret == 0) {
> + obj->fence_dirty =
> + obj->fenced_gpu_access ||
> + obj->fence_reg != I915_FENCE_REG_NONE;
> +
> + obj->tiling_mode = tiling_mode;
> + obj->stride = stride;
> +
> + /* Force the fence to be reacquired for GTT access */
> + i915_gem_release_mmap(obj);
> + }
> +
> + return ret;
> +}
> +
> +
> /**
> * Sets the tiling mode of an object, returning the required swizzling of
> * bit 6 of addresses in the object.
> */
> int
> -i915_gem_set_tiling(struct drm_device *dev, void *data,
> +i915_gem_set_tiling_ioctl(struct drm_device *dev, void *data,
> struct drm_file *file)
> {
> struct drm_i915_gem_set_tiling *args = data;
> @@ -343,49 +399,7 @@ i915_gem_set_tiling(struct drm_device *dev, void *data,
> }
>
> mutex_lock(&dev->struct_mutex);
> - if (args->tiling_mode != obj->tiling_mode ||
> - args->stride != obj->stride) {
> - /* We need to rebind the object if its current allocation
> - * no longer meets the alignment restrictions for its new
> - * tiling mode. Otherwise we can just leave it alone, but
> - * need to ensure that any fence register is updated before
> - * the next fenced (either through the GTT or by the BLT unit
> - * on older GPUs) access.
> - *
> - * After updating the tiling parameters, we then flag whether
> - * we need to update an associated fence register. Note this
> - * has to also include the unfenced register the GPU uses
> - * whilst executing a fenced command for an untiled object.
> - */
> -
> - obj->map_and_fenceable =
> - !i915_gem_obj_ggtt_bound(obj) ||
> - (i915_gem_obj_ggtt_offset(obj) +
> - obj->base.size <= dev_priv->gtt.mappable_end &&
> - i915_gem_object_fence_ok(obj, args->tiling_mode));
> -
> - /* Rebind if we need a change of alignment */
> - if (!obj->map_and_fenceable) {
> - u32 unfenced_align =
> - i915_gem_get_gtt_alignment(dev, obj->base.size,
> - args->tiling_mode,
> - false);
> - if (i915_gem_obj_ggtt_offset(obj) & (unfenced_align - 1))
> - ret = i915_gem_object_ggtt_unbind(obj);
> - }
> -
> - if (ret == 0) {
> - obj->fence_dirty =
> - obj->fenced_gpu_access ||
> - obj->fence_reg != I915_FENCE_REG_NONE;
> -
> - obj->tiling_mode = args->tiling_mode;
> - obj->stride = args->stride;
> -
> - /* Force the fence to be reacquired for GTT access */
> - i915_gem_release_mmap(obj);
> - }
> - }
> + ret = i915_gem_object_set_tiling(obj, args->tiling_mode, args->stride);
> /* we have to maintain this existing ABI... */
> args->stride = obj->stride;
> args->tiling_mode = obj->tiling_mode;
> @@ -411,7 +425,7 @@ i915_gem_set_tiling(struct drm_device *dev, void *data,
> * Returns the current tiling mode and required bit 6 swizzling for the object.
> */
> int
> -i915_gem_get_tiling(struct drm_device *dev, void *data,
> +i915_gem_get_tiling_ioctl(struct drm_device *dev, void *data,
> struct drm_file *file)
> {
> struct drm_i915_gem_get_tiling *args = data;
> diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
> index ff57f07..7cf2382 100644
> --- a/include/uapi/drm/i915_drm.h
> +++ b/include/uapi/drm/i915_drm.h
> @@ -224,6 +224,7 @@ typedef struct _drm_i915_sarea {
> #define DRM_I915_REG_READ 0x31
> #define DRM_I915_GET_RESET_STATS 0x32
> #define DRM_I915_GEM_USERPTR 0x33
> +#define DRM_I915_GEM_CREATE2 0x34
>
> #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)
> @@ -254,6 +255,7 @@ typedef struct _drm_i915_sarea {
> #define DRM_IOCTL_I915_GEM_ENTERVT DRM_IO(DRM_COMMAND_BASE + DRM_I915_GEM_ENTERVT)
> #define DRM_IOCTL_I915_GEM_LEAVEVT DRM_IO(DRM_COMMAND_BASE + DRM_I915_GEM_LEAVEVT)
> #define DRM_IOCTL_I915_GEM_CREATE DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_CREATE, struct drm_i915_gem_create)
> +#define DRM_IOCTL_I915_GEM_CREATE2 DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_CREATE2, struct drm_i915_gem_create2)
> #define DRM_IOCTL_I915_GEM_PREAD DRM_IOW (DRM_COMMAND_BASE + DRM_I915_GEM_PREAD, struct drm_i915_gem_pread)
> #define DRM_IOCTL_I915_GEM_PWRITE DRM_IOW (DRM_COMMAND_BASE + DRM_I915_GEM_PWRITE, struct drm_i915_gem_pwrite)
> #define DRM_IOCTL_I915_GEM_MMAP DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_MMAP, struct drm_i915_gem_mmap)
> @@ -437,6 +439,111 @@ struct drm_i915_gem_create {
> __u32 pad;
> };
>
> +struct drm_i915_gem_create2 {
> + /**
> + * Requested size for the object.
> + *
> + * The (page-aligned) allocated size for the object will be returned.
> + */
> + __u64 size;
> +
> + /**
> + * Requested offset for the object.
> + *
> + * Can be used for "soft-pinning" the object into the per-process
> + * GTT of the target context upon creation. Only possible if using
> + * contexts and per-process GTTs.
> + *
> + * The address must be page-aligned, and have the valid bit set.
> + */
> + __u64 offset;
> +#define I915_CREATE_OFFSET_VALID (1<<0)
> +
> + /**
> + * Target context of the object.
> + *
> + * The context of the object can be used for setting the initial offset
> + * of the object in the per-process GTT.
> + */
> + __u32 context;
> +
> + /**
> + * Requested placement (which memory domain)
> + *
> + * You can request that the object be created from special memory
> + * rather than regular system pages. Such irregular objects may
> + * have certain restrictions (such as CPU access to a stolen
> + * object is verboten).
> + */
> + __u32 placement;
> +#define I915_CREATE_PLACEMENT_SYSTEM 0
> +#define I915_CREATE_PLACEMENT_STOLEN 1 /* Cannot use CPU mmaps or pread/pwrite */
> + /**
> + * Requested domain (which cache domain)
> + *
> + * You can request that the object be created from memory in a
> + * certain cache domain (such as RENDER, CPU or GTT). In some cases,
> + * this then may allocate from a pool of such pages to avoid any
> + * migration overhead, but it is always equivalent to performing
> + * an explicit set-domain(read=DOMAIN, write=DOMAIN) on the
> + * constructed object.
> + *
> + * Set to 0, to leave the initial domain unspecified and defaulting
> + * to the domain set by the constructor.
> + *
> + * See DRM_IOCTL_I915_GEM_SET_DOMAIN
> + */
> + __u32 domain;
> +
> + /**
> + * Requested cache level.
> + *
> + * See DRM_IOCTL_I915_GEM_SET_CACHING
> + */
> + __u32 caching;
> +
> + /**
> + * Requested tiling mode.
> + *
> + * See DRM_IOCTL_I915_GEM_SET_TILING
> + */
> + __u32 tiling_mode;
> + /**
> + * Requested stride for tiling.
> + *
> + * See DRM_IOCTL_I915_GEM_SET_TILING
> + */
> + __u32 stride;
> +
> + /**
> + * Requested madvise priority.
> + *
> + * See DRM_IOCTL_I915_GEM_MADVISE
> + */
> + __u32 madvise;
> +
> + /**
> + * Additional miscellaneous flags
> + *
> + * Reserved for future use, must be zero.
> + */
> + __u32 flags;
> +
> + /**
> + * Padding for 64-bit struct alignment.
> + *
> + * Reserved for future use, must be zero.
> + */
> + __u32 pad;
> +
> + /**
> + * Returned handle for the object.
> + *
> + * Object handles are nonzero.
> + */
> + __u32 handle;
> +};
> +
> struct drm_i915_gem_pread {
> /** Handle for the object being read. */
> __u32 handle;
> --
> 1.8.5.1
>
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