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VPU Memory Management Unit is based on ARM MMU-600. It allows the creation of multiple virtual address spaces for the device and map noncontinuous host memory (there is no dedicated memory on the VPU). Address space is implemented as a struct ivpu_mmu_context, it has an ID, drm_mm allocator for VPU addresses and struct ivpu_mmu_pgtable that holds actual 3-level, 4KB page table. Context with ID 0 (global context) is created upon driver initialization and it's mainly used for mapping memory required to execute the firmware. Contexts with non-zero IDs are user contexts allocated each time the devices is open()-ed and they map command buffers and other workload-related memory. Workloads executing in a given contexts have access only to the memory mapped in this context. This patch is has two main files: - ivpu_mmu_context.c handles MMU page tables and memory mapping - ivpu_mmu.c implements a driver that programs the MMU device Co-developed-by: Karol Wachowski <karol.wachowski@linux.intel.com> Signed-off-by: Karol Wachowski <karol.wachowski@linux.intel.com> Co-developed-by: Krystian Pradzynski <krystian.pradzynski@linux.intel.com> Signed-off-by: Krystian Pradzynski <krystian.pradzynski@linux.intel.com> Signed-off-by: Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com> Reviewed-by: Oded Gabbay <ogabbay@kernel.org> Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20230117092723.60441-3-jacek.lawrynowicz@linux.intel.com
50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2020-2023 Intel Corporation
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*/
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#ifndef __IVPU_MMU_H__
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#define __IVPU_MMU_H__
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struct ivpu_device;
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struct ivpu_mmu_cdtab {
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void *base;
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dma_addr_t dma;
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};
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struct ivpu_mmu_strtab {
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void *base;
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dma_addr_t dma;
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u64 dma_q;
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u32 base_cfg;
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};
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struct ivpu_mmu_queue {
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void *base;
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dma_addr_t dma;
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u64 dma_q;
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u32 prod;
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u32 cons;
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};
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struct ivpu_mmu_info {
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struct mutex lock; /* Protects cdtab, strtab, cmdq, on */
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struct ivpu_mmu_cdtab cdtab;
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struct ivpu_mmu_strtab strtab;
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struct ivpu_mmu_queue cmdq;
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struct ivpu_mmu_queue evtq;
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bool on;
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};
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int ivpu_mmu_init(struct ivpu_device *vdev);
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void ivpu_mmu_disable(struct ivpu_device *vdev);
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int ivpu_mmu_enable(struct ivpu_device *vdev);
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int ivpu_mmu_set_pgtable(struct ivpu_device *vdev, int ssid, struct ivpu_mmu_pgtable *pgtable);
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void ivpu_mmu_clear_pgtable(struct ivpu_device *vdev, int ssid);
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int ivpu_mmu_invalidate_tlb(struct ivpu_device *vdev, u16 ssid);
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void ivpu_mmu_irq_evtq_handler(struct ivpu_device *vdev);
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void ivpu_mmu_irq_gerr_handler(struct ivpu_device *vdev);
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#endif /* __IVPU_MMU_H__ */
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