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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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871d812aa4
Add a VRAM carveout that is used for systems which do not have an IOMMU. The VRAM carveout uses CMA. The arch code must setup a CMA pool for the device (preferrably in highmem.. a 256m-512m VRAM pool in lowmem is not cool). The user can configure the VRAM pool size using msm.vram module param. Technically, the abstraction of IOMMU behind msm_mmu is not strictly needed, but it simplifies the GEM code a bit, and will be useful later when I add support for a2xx devices with GPUMMU, so I decided to keep this part. It appears to be possible to configure the GPU to restrict access to addresses within the VRAM pool, but this is not done yet. So for now the GPU will refuse to load if there is no sort of mmu. Once address based limits are supported and tested to confirm that we aren't giving the GPU access to arbitrary memory, this restriction can be lifted Signed-off-by: Rob Clark <robdclark@gmail.com>
48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
/*
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* Copyright (C) 2013 Red Hat
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* Author: Rob Clark <robdclark@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __MSM_MMU_H__
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#define __MSM_MMU_H__
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#include <linux/iommu.h>
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struct msm_mmu_funcs {
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int (*attach)(struct msm_mmu *mmu, const char **names, int cnt);
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int (*map)(struct msm_mmu *mmu, uint32_t iova, struct sg_table *sgt,
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unsigned len, int prot);
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int (*unmap)(struct msm_mmu *mmu, uint32_t iova, struct sg_table *sgt,
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unsigned len);
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void (*destroy)(struct msm_mmu *mmu);
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};
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struct msm_mmu {
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const struct msm_mmu_funcs *funcs;
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struct drm_device *dev;
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};
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static inline void msm_mmu_init(struct msm_mmu *mmu, struct drm_device *dev,
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const struct msm_mmu_funcs *funcs)
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{
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mmu->dev = dev;
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mmu->funcs = funcs;
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}
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struct msm_mmu *msm_iommu_new(struct drm_device *dev, struct iommu_domain *domain);
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struct msm_mmu *msm_gpummu_new(struct drm_device *dev, struct msm_gpu *gpu);
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#endif /* __MSM_MMU_H__ */
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