mirror of https://gitee.com/openkylin/linux.git
53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
/*
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* Copyright © 2015 Broadcom
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/* DOC: VC4 GEM BO management support.
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*
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* The VC4 GPU architecture (both scanout and rendering) has direct
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* access to system memory with no MMU in between. To support it, we
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* use the GEM CMA helper functions to allocate contiguous ranges of
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* physical memory for our BOs.
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*/
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#include "vc4_drv.h"
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struct vc4_bo *vc4_bo_create(struct drm_device *dev, size_t size)
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{
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struct drm_gem_cma_object *cma_obj;
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cma_obj = drm_gem_cma_create(dev, size);
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if (IS_ERR(cma_obj))
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return NULL;
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else
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return to_vc4_bo(&cma_obj->base);
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}
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int vc4_dumb_create(struct drm_file *file_priv,
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struct drm_device *dev,
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struct drm_mode_create_dumb *args)
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{
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int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
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struct vc4_bo *bo = NULL;
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int ret;
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if (args->pitch < min_pitch)
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args->pitch = min_pitch;
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if (args->size < args->pitch * args->height)
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args->size = args->pitch * args->height;
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bo = vc4_bo_create(dev, roundup(args->size, PAGE_SIZE));
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if (!bo)
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return -ENOMEM;
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ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
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drm_gem_object_unreference_unlocked(&bo->base.base);
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return ret;
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}
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