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Up until now, a single shared GPU address space was used. This is not ideal as there's no protection between processes and doesn't work for supporting the same GPU/CPU VA feature. Most importantly, this will hopefully mitigate Alyssa's fear of WebGL, whatever that is. Most of the changes here are moving struct drm_mm and struct panfrost_mmu objects from the per device struct to the per FD struct. The critical function is panfrost_mmu_as_get() which handles allocating and switching the h/w address spaces. There's 3 states an AS can be in: free, allocated, and in use. When a job runs, it requests an address space and then marks it not in use when job is complete(but stays assigned). The first time thru, we find a free AS in the alloc_mask and assign the AS to the FD. Then the next time thru, we most likely already have our AS and we just mark it in use with a ref count. We need a ref count because we have multiple job slots. If the job/FD doesn't have an AS assigned and there are no free ones, then we pick an allocated one not in use from our LRU list and switch the AS from the old FD to the new one. Cc: Tomeu Vizoso <tomeu.vizoso@collabora.com> Cc: David Airlie <airlied@linux.ie> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: Robin Murphy <robin.murphy@arm.com> Cc: Steven Price <steven.price@arm.com> Signed-off-by: Rob Herring <robh@kernel.org> Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> Reviewed-by: Steven Price <steven.price@arm.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190813150115.30338-1-robh@kernel.org
25 lines
818 B
C
25 lines
818 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright 2019 Linaro, Ltd, Rob Herring <robh@kernel.org> */
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#ifndef __PANFROST_MMU_H__
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#define __PANFROST_MMU_H__
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struct panfrost_gem_object;
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struct panfrost_file_priv;
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struct panfrost_mmu;
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int panfrost_mmu_map(struct panfrost_gem_object *bo);
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void panfrost_mmu_unmap(struct panfrost_gem_object *bo);
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int panfrost_mmu_init(struct panfrost_device *pfdev);
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void panfrost_mmu_fini(struct panfrost_device *pfdev);
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void panfrost_mmu_reset(struct panfrost_device *pfdev);
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u32 panfrost_mmu_as_get(struct panfrost_device *pfdev, struct panfrost_mmu *mmu);
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void panfrost_mmu_as_put(struct panfrost_device *pfdev, struct panfrost_mmu *mmu);
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int panfrost_mmu_pgtable_alloc(struct panfrost_file_priv *priv);
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void panfrost_mmu_pgtable_free(struct panfrost_file_priv *priv);
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#endif
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