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With the introduction of per-FD address space, the same BO can be mapped in different address space if the BO is globally visible (GEM_FLINK) and opened in different context or if the dmabuf is self-imported. The current implementation does not take case into account, and attaches the mapping directly to the panfrost_gem_object. Let's create a panfrost_gem_mapping struct and allow multiple mappings per BO. The mappings are refcounted which helps solve another problem where mappings were torn down (GEM handle closed by userspace) while GPU jobs accessing those BOs were still in-flight. Jobs now keep a reference on the mappings they use. v2 (robh): - Minor review comment clean-ups from Steven - Use list_is_singular helper - Just WARN if we add a mapping when madvise state is not WILLNEED. With that, drop the use of object_name_lock. v3 (robh): - Revert returning list iterator in panfrost_gem_mapping_get() Fixes:a5efb4c9a5("drm/panfrost: Restructure the GEM object creation") Fixes:7282f7645d("drm/panfrost: Implement per FD address spaces") Cc: <stable@vger.kernel.org> Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com> Signed-off-by: Rob Herring <robh@kernel.org> Acked-by: Boris Brezillon <boris.brezillon@collabora.com> Reviewed-by: Steven Price <steven.price@arm.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200116021554.15090-1-robh@kernel.org
24 lines
831 B
C
24 lines
831 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_mapping;
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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_mapping *mapping);
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void panfrost_mmu_unmap(struct panfrost_gem_mapping *mapping);
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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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