On Fri, Oct 19, 2018 at 12:27:50AM +0800, Thomas Zimmermann wrote:
> The new struct ttm_global provides drivers with TTM's global memory and
> BO in a unified way. Initialization and release is handled internally.
>
> The functionality provided by struct ttm_global is currently re-implemented
> by a dozen individual DRM drivers using struct drm_global. The implementation
> of struct ttm_global is also built on top of drm_global, so it can co-exists
> with the existing drivers. Once all TTM-based drivers have been converted to
> struct ttm_global, the implementation of struct drm_global can be made
> private to TTM.
>
> Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
> ---
> drivers/gpu/drm/ttm/Makefile | 2 +-
> drivers/gpu/drm/ttm/ttm_global.c | 98 ++++++++++++++++++++++++++++++++
> include/drm/drm_global.h | 8 +++
> include/drm/ttm/ttm_global.h | 79 +++++++++++++++++++++++++
> 4 files changed, 186 insertions(+), 1 deletion(-)
> create mode 100644 drivers/gpu/drm/ttm/ttm_global.c
> create mode 100644 include/drm/ttm/ttm_global.h
>
> diff --git a/drivers/gpu/drm/ttm/Makefile b/drivers/gpu/drm/ttm/Makefile
> index 01fc670ce7a2..b7272b26e9f3 100644
> --- a/drivers/gpu/drm/ttm/Makefile
> +++ b/drivers/gpu/drm/ttm/Makefile
> @@ -5,7 +5,7 @@
> ttm-y := ttm_memory.o ttm_tt.o ttm_bo.o \
> ttm_bo_util.o ttm_bo_vm.o ttm_module.o \
> ttm_execbuf_util.o ttm_page_alloc.o ttm_bo_manager.o \
> - ttm_page_alloc_dma.o
> + ttm_page_alloc_dma.o ttm_global.o
> ttm-$(CONFIG_AGP) += ttm_agp_backend.o
>
> obj-$(CONFIG_DRM_TTM) += ttm.o
> diff --git a/drivers/gpu/drm/ttm/ttm_global.c b/drivers/gpu/drm/ttm/ttm_global.c
> new file mode 100644
> index 000000000000..ca9da0a46147
> --- /dev/null
> +++ b/drivers/gpu/drm/ttm/ttm_global.c
> @@ -0,0 +1,98 @@
> +/* SPDX-License-Identifier: GPL-2.0 OR MIT */
> +/**************************************************************************
> + *
> + * Copyright 2008-2009 VMware, Inc., Palo Alto, CA., USA
> + * All Rights Reserved.
> + *
> + * 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
> + * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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 <drm/ttm/ttm_global.h>
> +#include <drm/ttm/ttm_bo_driver.h>
> +#include <drm/ttm/ttm_memory.h>
> +#include <linux/kernel.h>
> +
> +static int ttm_global_init_mem(struct drm_global_reference *ref)
> +{
> + BUG_ON(!ref->object);
> + return ttm_mem_global_init(ref->object);
> +}
> +
> +static void ttm_global_release_mem(struct drm_global_reference *ref)
> +{
> + BUG_ON(!ref->object);
> + ttm_mem_global_release(ref->object);
> +}
> +
> +static int ttm_global_init_bo(struct drm_global_reference *ref)
> +{
> + struct ttm_global *glob =
> + container_of(ref, struct ttm_global, bo_ref);
> + BUG_ON(!ref->object);
> + BUG_ON(!glob->mem_ref.object);
> + return ttm_bo_global_init(ref->object, glob->mem_ref.object);
> +}
> +
> +static void ttm_global_release_bo(struct drm_global_reference *ref)
> +{
> + BUG_ON(!ref->object);
> + ttm_bo_global_release(ref->object);
> +}
> +
> +int ttm_global_init(struct ttm_global *glob)
> +{
> + int ret;
> +
We would better add a protection here to make sure the glob is not NULL.
if (!glob)
return -EINVAL;
Others, look good for me.
Thanks,
Ray
> + glob->mem_ref.global_type = DRM_GLOBAL_TTM_MEM;
> + glob->mem_ref.size = sizeof(struct ttm_mem_global);
> + glob->bo_ref.object = NULL;
> + glob->mem_ref.init = &ttm_global_init_mem;
> + glob->mem_ref.release = &ttm_global_release_mem;
> + ret = drm_global_item_ref(&glob->mem_ref);
> + if (ret)
> + return ret;
> +
> + glob->bo_ref.global_type = DRM_GLOBAL_TTM_BO;
> + glob->bo_ref.size = sizeof(struct ttm_bo_global);
> + glob->bo_ref.object = NULL;
> + glob->bo_ref.init = &ttm_global_init_bo;
> + glob->bo_ref.release = &ttm_global_release_bo;
> + ret = drm_global_item_ref(&glob->bo_ref);
> + if (ret)
> + goto err_drm_global_item_unref_mem;
> +
> + return 0;
> +
> +err_drm_global_item_unref_mem:
> + drm_global_item_unref(&glob->mem_ref);
> + return ret;
> +}
> +
> +EXPORT_SYMBOL(ttm_global_init);
> +
> +void ttm_global_release(struct ttm_global *glob)
> +{
> + drm_global_item_unref(&glob->bo_ref);
> + drm_global_item_unref(&glob->mem_ref);
> +}
> +
> +EXPORT_SYMBOL(ttm_global_release);
> diff --git a/include/drm/drm_global.h b/include/drm/drm_global.h
> index 3a830602a2e4..4482a9bbd6e9 100644
> --- a/include/drm/drm_global.h
> +++ b/include/drm/drm_global.h
> @@ -28,8 +28,16 @@
> * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
> */
>
> +/*
> + * The interfaces in this file are deprecated. Please use ttm_global
> + * from <drm/ttm/ttm_global.h> instead.
> + */
> +
> #ifndef _DRM_GLOBAL_H_
> #define _DRM_GLOBAL_H_
> +
> +#include <linux/types.h>
> +
> enum drm_global_types {
> DRM_GLOBAL_TTM_MEM = 0,
> DRM_GLOBAL_TTM_BO,
> diff --git a/include/drm/ttm/ttm_global.h b/include/drm/ttm/ttm_global.h
> new file mode 100644
> index 000000000000..06e791499f87
> --- /dev/null
> +++ b/include/drm/ttm/ttm_global.h
> @@ -0,0 +1,79 @@
> +/**************************************************************************
> + *
> + * Copyright 2008-2009 VMware, Inc., Palo Alto, CA., USA
> + * All Rights Reserved.
> + *
> + * 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
> + * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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.
> + *
> + **************************************************************************/
> +
> +#ifndef _TTM_GLOBAL_H_
> +#define _TTM_GLOBAL_H_
> +
> +#include <drm/drm_global.h>
> +
> +struct ttm_bo_global;
> +
> +/**
> + * struct ttm_global - Stores references to global TTM state
> + */
> +struct ttm_global {
> + struct drm_global_reference mem_ref;
> + struct drm_global_reference bo_ref;
> +};
> +
> +/**
> + * ttm_global_init
> + *
> + * @glob: A pointer to a struct ttm_global that is about to be initialized
> + * @return Zero on success, or a negative error code otherwise.
> + *
> + * Initializes an instance of struct ttm_global with TTM's global state
> + */
> +int ttm_global_init(struct ttm_global *glob);
> +
> +/**
> + * ttm_global_release
> + *
> + * @glob: A pointer to an instance of struct ttm_global
> + *
> + * Releases an initialized instance of struct ttm_global. If the instance
> + * constains the final references to the global memory and BO, the global
> + * structures are released as well.
> + */
> +void ttm_global_release(struct ttm_global *glob);
> +
> +/**
> + * ttm_global_get_bo_global
> + *
> + * @glob A pointer to an instance of struct ttm_global
> + * @return A refernce to the global BO.
> + *
> + * Returns the global BO. The BO should be forwarded to the initialization
> + * of a driver's TTM BO device.
> + */
> +static inline struct ttm_bo_global*
> +ttm_global_get_bo_global(struct ttm_global *glob)
> +{
> + return glob->bo_ref.object;
> +}
> +
> +#endif /* _TTM_GLOBAL_H_ */
> --
> 2.19.1
>
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