1185 lines
28 KiB
C
1185 lines
28 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2011-2014 NVIDIA CORPORATION. All rights reserved.
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*/
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#include <linux/bitops.h>
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#include <linux/debugfs.h>
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#include <linux/err.h>
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#include <linux/iommu.h>
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/pci.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/dma-mapping.h>
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#include <soc/tegra/ahb.h>
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#include <soc/tegra/mc.h>
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struct tegra_smmu_group {
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struct list_head list;
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struct tegra_smmu *smmu;
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const struct tegra_smmu_group_soc *soc;
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struct iommu_group *group;
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unsigned int swgroup;
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};
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struct tegra_smmu {
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void __iomem *regs;
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struct device *dev;
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struct tegra_mc *mc;
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const struct tegra_smmu_soc *soc;
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struct list_head groups;
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unsigned long pfn_mask;
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unsigned long tlb_mask;
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unsigned long *asids;
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struct mutex lock;
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struct list_head list;
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struct dentry *debugfs;
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struct iommu_device iommu; /* IOMMU Core code handle */
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};
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struct tegra_smmu_as {
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struct iommu_domain domain;
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struct tegra_smmu *smmu;
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unsigned int use_count;
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spinlock_t lock;
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u32 *count;
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struct page **pts;
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struct page *pd;
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dma_addr_t pd_dma;
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unsigned id;
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u32 attr;
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};
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static struct tegra_smmu_as *to_smmu_as(struct iommu_domain *dom)
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{
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return container_of(dom, struct tegra_smmu_as, domain);
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}
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static inline void smmu_writel(struct tegra_smmu *smmu, u32 value,
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unsigned long offset)
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{
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writel(value, smmu->regs + offset);
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}
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static inline u32 smmu_readl(struct tegra_smmu *smmu, unsigned long offset)
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{
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return readl(smmu->regs + offset);
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}
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#define SMMU_CONFIG 0x010
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#define SMMU_CONFIG_ENABLE (1 << 0)
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#define SMMU_TLB_CONFIG 0x14
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#define SMMU_TLB_CONFIG_HIT_UNDER_MISS (1 << 29)
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#define SMMU_TLB_CONFIG_ROUND_ROBIN_ARBITRATION (1 << 28)
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#define SMMU_TLB_CONFIG_ACTIVE_LINES(smmu) \
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((smmu)->soc->num_tlb_lines & (smmu)->tlb_mask)
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#define SMMU_PTC_CONFIG 0x18
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#define SMMU_PTC_CONFIG_ENABLE (1 << 29)
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#define SMMU_PTC_CONFIG_REQ_LIMIT(x) (((x) & 0x0f) << 24)
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#define SMMU_PTC_CONFIG_INDEX_MAP(x) ((x) & 0x3f)
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#define SMMU_PTB_ASID 0x01c
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#define SMMU_PTB_ASID_VALUE(x) ((x) & 0x7f)
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#define SMMU_PTB_DATA 0x020
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#define SMMU_PTB_DATA_VALUE(dma, attr) ((dma) >> 12 | (attr))
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#define SMMU_MK_PDE(dma, attr) ((dma) >> SMMU_PTE_SHIFT | (attr))
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#define SMMU_TLB_FLUSH 0x030
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#define SMMU_TLB_FLUSH_VA_MATCH_ALL (0 << 0)
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#define SMMU_TLB_FLUSH_VA_MATCH_SECTION (2 << 0)
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#define SMMU_TLB_FLUSH_VA_MATCH_GROUP (3 << 0)
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#define SMMU_TLB_FLUSH_VA_SECTION(addr) ((((addr) & 0xffc00000) >> 12) | \
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SMMU_TLB_FLUSH_VA_MATCH_SECTION)
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#define SMMU_TLB_FLUSH_VA_GROUP(addr) ((((addr) & 0xffffc000) >> 12) | \
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SMMU_TLB_FLUSH_VA_MATCH_GROUP)
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#define SMMU_TLB_FLUSH_ASID_MATCH (1 << 31)
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#define SMMU_PTC_FLUSH 0x034
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#define SMMU_PTC_FLUSH_TYPE_ALL (0 << 0)
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#define SMMU_PTC_FLUSH_TYPE_ADR (1 << 0)
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#define SMMU_PTC_FLUSH_HI 0x9b8
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#define SMMU_PTC_FLUSH_HI_MASK 0x3
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/* per-SWGROUP SMMU_*_ASID register */
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#define SMMU_ASID_ENABLE (1 << 31)
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#define SMMU_ASID_MASK 0x7f
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#define SMMU_ASID_VALUE(x) ((x) & SMMU_ASID_MASK)
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/* page table definitions */
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#define SMMU_NUM_PDE 1024
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#define SMMU_NUM_PTE 1024
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#define SMMU_SIZE_PD (SMMU_NUM_PDE * 4)
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#define SMMU_SIZE_PT (SMMU_NUM_PTE * 4)
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#define SMMU_PDE_SHIFT 22
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#define SMMU_PTE_SHIFT 12
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#define SMMU_PAGE_MASK (~(SMMU_SIZE_PT-1))
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#define SMMU_OFFSET_IN_PAGE(x) ((unsigned long)(x) & ~SMMU_PAGE_MASK)
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#define SMMU_PFN_PHYS(x) ((phys_addr_t)(x) << SMMU_PTE_SHIFT)
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#define SMMU_PHYS_PFN(x) ((unsigned long)((x) >> SMMU_PTE_SHIFT))
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#define SMMU_PD_READABLE (1 << 31)
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#define SMMU_PD_WRITABLE (1 << 30)
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#define SMMU_PD_NONSECURE (1 << 29)
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#define SMMU_PDE_READABLE (1 << 31)
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#define SMMU_PDE_WRITABLE (1 << 30)
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#define SMMU_PDE_NONSECURE (1 << 29)
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#define SMMU_PDE_NEXT (1 << 28)
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#define SMMU_PTE_READABLE (1 << 31)
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#define SMMU_PTE_WRITABLE (1 << 30)
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#define SMMU_PTE_NONSECURE (1 << 29)
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#define SMMU_PDE_ATTR (SMMU_PDE_READABLE | SMMU_PDE_WRITABLE | \
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SMMU_PDE_NONSECURE)
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static unsigned int iova_pd_index(unsigned long iova)
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{
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return (iova >> SMMU_PDE_SHIFT) & (SMMU_NUM_PDE - 1);
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}
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static unsigned int iova_pt_index(unsigned long iova)
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{
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return (iova >> SMMU_PTE_SHIFT) & (SMMU_NUM_PTE - 1);
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}
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static bool smmu_dma_addr_valid(struct tegra_smmu *smmu, dma_addr_t addr)
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{
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addr >>= 12;
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return (addr & smmu->pfn_mask) == addr;
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}
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static dma_addr_t smmu_pde_to_dma(struct tegra_smmu *smmu, u32 pde)
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{
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return (dma_addr_t)(pde & smmu->pfn_mask) << 12;
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}
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static void smmu_flush_ptc_all(struct tegra_smmu *smmu)
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{
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smmu_writel(smmu, SMMU_PTC_FLUSH_TYPE_ALL, SMMU_PTC_FLUSH);
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}
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static inline void smmu_flush_ptc(struct tegra_smmu *smmu, dma_addr_t dma,
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unsigned long offset)
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{
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u32 value;
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offset &= ~(smmu->mc->soc->atom_size - 1);
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if (smmu->mc->soc->num_address_bits > 32) {
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#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
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value = (dma >> 32) & SMMU_PTC_FLUSH_HI_MASK;
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#else
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value = 0;
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#endif
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smmu_writel(smmu, value, SMMU_PTC_FLUSH_HI);
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}
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value = (dma + offset) | SMMU_PTC_FLUSH_TYPE_ADR;
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smmu_writel(smmu, value, SMMU_PTC_FLUSH);
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}
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static inline void smmu_flush_tlb(struct tegra_smmu *smmu)
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{
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smmu_writel(smmu, SMMU_TLB_FLUSH_VA_MATCH_ALL, SMMU_TLB_FLUSH);
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}
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static inline void smmu_flush_tlb_asid(struct tegra_smmu *smmu,
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unsigned long asid)
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{
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u32 value;
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if (smmu->soc->num_asids == 4)
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value = (asid & 0x3) << 29;
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else
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value = (asid & 0x7f) << 24;
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value |= SMMU_TLB_FLUSH_ASID_MATCH | SMMU_TLB_FLUSH_VA_MATCH_ALL;
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smmu_writel(smmu, value, SMMU_TLB_FLUSH);
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}
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static inline void smmu_flush_tlb_section(struct tegra_smmu *smmu,
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unsigned long asid,
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unsigned long iova)
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{
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u32 value;
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if (smmu->soc->num_asids == 4)
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value = (asid & 0x3) << 29;
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else
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value = (asid & 0x7f) << 24;
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value |= SMMU_TLB_FLUSH_ASID_MATCH | SMMU_TLB_FLUSH_VA_SECTION(iova);
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smmu_writel(smmu, value, SMMU_TLB_FLUSH);
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}
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static inline void smmu_flush_tlb_group(struct tegra_smmu *smmu,
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unsigned long asid,
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unsigned long iova)
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{
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u32 value;
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if (smmu->soc->num_asids == 4)
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value = (asid & 0x3) << 29;
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else
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value = (asid & 0x7f) << 24;
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value |= SMMU_TLB_FLUSH_ASID_MATCH | SMMU_TLB_FLUSH_VA_GROUP(iova);
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smmu_writel(smmu, value, SMMU_TLB_FLUSH);
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}
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static inline void smmu_flush(struct tegra_smmu *smmu)
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{
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smmu_readl(smmu, SMMU_PTB_ASID);
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}
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static int tegra_smmu_alloc_asid(struct tegra_smmu *smmu, unsigned int *idp)
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{
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unsigned long id;
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id = find_first_zero_bit(smmu->asids, smmu->soc->num_asids);
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if (id >= smmu->soc->num_asids)
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return -ENOSPC;
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set_bit(id, smmu->asids);
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*idp = id;
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return 0;
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}
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static void tegra_smmu_free_asid(struct tegra_smmu *smmu, unsigned int id)
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{
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clear_bit(id, smmu->asids);
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}
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static bool tegra_smmu_capable(enum iommu_cap cap)
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{
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return false;
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}
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static struct iommu_domain *tegra_smmu_domain_alloc(unsigned type)
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{
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struct tegra_smmu_as *as;
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if (type != IOMMU_DOMAIN_UNMANAGED)
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return NULL;
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as = kzalloc(sizeof(*as), GFP_KERNEL);
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if (!as)
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return NULL;
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as->attr = SMMU_PD_READABLE | SMMU_PD_WRITABLE | SMMU_PD_NONSECURE;
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as->pd = alloc_page(GFP_KERNEL | __GFP_DMA | __GFP_ZERO);
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if (!as->pd) {
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kfree(as);
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return NULL;
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}
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as->count = kcalloc(SMMU_NUM_PDE, sizeof(u32), GFP_KERNEL);
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if (!as->count) {
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__free_page(as->pd);
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kfree(as);
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return NULL;
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}
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as->pts = kcalloc(SMMU_NUM_PDE, sizeof(*as->pts), GFP_KERNEL);
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if (!as->pts) {
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kfree(as->count);
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__free_page(as->pd);
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kfree(as);
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return NULL;
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}
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spin_lock_init(&as->lock);
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/* setup aperture */
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as->domain.geometry.aperture_start = 0;
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as->domain.geometry.aperture_end = 0xffffffff;
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as->domain.geometry.force_aperture = true;
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return &as->domain;
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}
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static void tegra_smmu_domain_free(struct iommu_domain *domain)
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{
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struct tegra_smmu_as *as = to_smmu_as(domain);
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/* TODO: free page directory and page tables */
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WARN_ON_ONCE(as->use_count);
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kfree(as->count);
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kfree(as->pts);
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kfree(as);
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}
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static const struct tegra_smmu_swgroup *
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tegra_smmu_find_swgroup(struct tegra_smmu *smmu, unsigned int swgroup)
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{
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const struct tegra_smmu_swgroup *group = NULL;
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unsigned int i;
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for (i = 0; i < smmu->soc->num_swgroups; i++) {
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if (smmu->soc->swgroups[i].swgroup == swgroup) {
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group = &smmu->soc->swgroups[i];
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break;
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}
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}
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return group;
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}
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static void tegra_smmu_enable(struct tegra_smmu *smmu, unsigned int swgroup,
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unsigned int asid)
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{
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const struct tegra_smmu_swgroup *group;
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unsigned int i;
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u32 value;
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group = tegra_smmu_find_swgroup(smmu, swgroup);
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if (group) {
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value = smmu_readl(smmu, group->reg);
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value &= ~SMMU_ASID_MASK;
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value |= SMMU_ASID_VALUE(asid);
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value |= SMMU_ASID_ENABLE;
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smmu_writel(smmu, value, group->reg);
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} else {
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pr_warn("%s group from swgroup %u not found\n", __func__,
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swgroup);
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/* No point moving ahead if group was not found */
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return;
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}
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for (i = 0; i < smmu->soc->num_clients; i++) {
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const struct tegra_mc_client *client = &smmu->soc->clients[i];
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if (client->swgroup != swgroup)
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continue;
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value = smmu_readl(smmu, client->regs.smmu.reg);
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value |= BIT(client->regs.smmu.bit);
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smmu_writel(smmu, value, client->regs.smmu.reg);
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}
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}
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static void tegra_smmu_disable(struct tegra_smmu *smmu, unsigned int swgroup,
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unsigned int asid)
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{
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const struct tegra_smmu_swgroup *group;
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unsigned int i;
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u32 value;
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group = tegra_smmu_find_swgroup(smmu, swgroup);
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if (group) {
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value = smmu_readl(smmu, group->reg);
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value &= ~SMMU_ASID_MASK;
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value |= SMMU_ASID_VALUE(asid);
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value &= ~SMMU_ASID_ENABLE;
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smmu_writel(smmu, value, group->reg);
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}
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for (i = 0; i < smmu->soc->num_clients; i++) {
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const struct tegra_mc_client *client = &smmu->soc->clients[i];
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if (client->swgroup != swgroup)
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continue;
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value = smmu_readl(smmu, client->regs.smmu.reg);
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value &= ~BIT(client->regs.smmu.bit);
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smmu_writel(smmu, value, client->regs.smmu.reg);
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}
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}
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static int tegra_smmu_as_prepare(struct tegra_smmu *smmu,
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struct tegra_smmu_as *as)
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{
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u32 value;
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int err = 0;
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mutex_lock(&smmu->lock);
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if (as->use_count > 0) {
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as->use_count++;
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goto unlock;
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}
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as->pd_dma = dma_map_page(smmu->dev, as->pd, 0, SMMU_SIZE_PD,
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DMA_TO_DEVICE);
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if (dma_mapping_error(smmu->dev, as->pd_dma)) {
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err = -ENOMEM;
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goto unlock;
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}
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/* We can't handle 64-bit DMA addresses */
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if (!smmu_dma_addr_valid(smmu, as->pd_dma)) {
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err = -ENOMEM;
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goto err_unmap;
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}
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err = tegra_smmu_alloc_asid(smmu, &as->id);
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if (err < 0)
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goto err_unmap;
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smmu_flush_ptc(smmu, as->pd_dma, 0);
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smmu_flush_tlb_asid(smmu, as->id);
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smmu_writel(smmu, as->id & 0x7f, SMMU_PTB_ASID);
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value = SMMU_PTB_DATA_VALUE(as->pd_dma, as->attr);
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smmu_writel(smmu, value, SMMU_PTB_DATA);
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smmu_flush(smmu);
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as->smmu = smmu;
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as->use_count++;
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mutex_unlock(&smmu->lock);
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return 0;
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err_unmap:
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dma_unmap_page(smmu->dev, as->pd_dma, SMMU_SIZE_PD, DMA_TO_DEVICE);
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unlock:
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mutex_unlock(&smmu->lock);
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return err;
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}
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static void tegra_smmu_as_unprepare(struct tegra_smmu *smmu,
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struct tegra_smmu_as *as)
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{
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mutex_lock(&smmu->lock);
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if (--as->use_count > 0) {
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mutex_unlock(&smmu->lock);
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return;
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}
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tegra_smmu_free_asid(smmu, as->id);
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dma_unmap_page(smmu->dev, as->pd_dma, SMMU_SIZE_PD, DMA_TO_DEVICE);
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as->smmu = NULL;
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mutex_unlock(&smmu->lock);
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}
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static int tegra_smmu_attach_dev(struct iommu_domain *domain,
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struct device *dev)
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{
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struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
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struct tegra_smmu *smmu = dev_iommu_priv_get(dev);
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struct tegra_smmu_as *as = to_smmu_as(domain);
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unsigned int index;
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int err;
|
|
|
|
if (!fwspec)
|
|
return -ENOENT;
|
|
|
|
for (index = 0; index < fwspec->num_ids; index++) {
|
|
err = tegra_smmu_as_prepare(smmu, as);
|
|
if (err)
|
|
goto disable;
|
|
|
|
tegra_smmu_enable(smmu, fwspec->ids[index], as->id);
|
|
}
|
|
|
|
if (index == 0)
|
|
return -ENODEV;
|
|
|
|
return 0;
|
|
|
|
disable:
|
|
while (index--) {
|
|
tegra_smmu_disable(smmu, fwspec->ids[index], as->id);
|
|
tegra_smmu_as_unprepare(smmu, as);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static void tegra_smmu_detach_dev(struct iommu_domain *domain, struct device *dev)
|
|
{
|
|
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
|
|
struct tegra_smmu_as *as = to_smmu_as(domain);
|
|
struct tegra_smmu *smmu = as->smmu;
|
|
unsigned int index;
|
|
|
|
if (!fwspec)
|
|
return;
|
|
|
|
for (index = 0; index < fwspec->num_ids; index++) {
|
|
tegra_smmu_disable(smmu, fwspec->ids[index], as->id);
|
|
tegra_smmu_as_unprepare(smmu, as);
|
|
}
|
|
}
|
|
|
|
static void tegra_smmu_set_pde(struct tegra_smmu_as *as, unsigned long iova,
|
|
u32 value)
|
|
{
|
|
unsigned int pd_index = iova_pd_index(iova);
|
|
struct tegra_smmu *smmu = as->smmu;
|
|
u32 *pd = page_address(as->pd);
|
|
unsigned long offset = pd_index * sizeof(*pd);
|
|
|
|
/* Set the page directory entry first */
|
|
pd[pd_index] = value;
|
|
|
|
/* The flush the page directory entry from caches */
|
|
dma_sync_single_range_for_device(smmu->dev, as->pd_dma, offset,
|
|
sizeof(*pd), DMA_TO_DEVICE);
|
|
|
|
/* And flush the iommu */
|
|
smmu_flush_ptc(smmu, as->pd_dma, offset);
|
|
smmu_flush_tlb_section(smmu, as->id, iova);
|
|
smmu_flush(smmu);
|
|
}
|
|
|
|
static u32 *tegra_smmu_pte_offset(struct page *pt_page, unsigned long iova)
|
|
{
|
|
u32 *pt = page_address(pt_page);
|
|
|
|
return pt + iova_pt_index(iova);
|
|
}
|
|
|
|
static u32 *tegra_smmu_pte_lookup(struct tegra_smmu_as *as, unsigned long iova,
|
|
dma_addr_t *dmap)
|
|
{
|
|
unsigned int pd_index = iova_pd_index(iova);
|
|
struct tegra_smmu *smmu = as->smmu;
|
|
struct page *pt_page;
|
|
u32 *pd;
|
|
|
|
pt_page = as->pts[pd_index];
|
|
if (!pt_page)
|
|
return NULL;
|
|
|
|
pd = page_address(as->pd);
|
|
*dmap = smmu_pde_to_dma(smmu, pd[pd_index]);
|
|
|
|
return tegra_smmu_pte_offset(pt_page, iova);
|
|
}
|
|
|
|
static u32 *as_get_pte(struct tegra_smmu_as *as, dma_addr_t iova,
|
|
dma_addr_t *dmap, struct page *page)
|
|
{
|
|
unsigned int pde = iova_pd_index(iova);
|
|
struct tegra_smmu *smmu = as->smmu;
|
|
|
|
if (!as->pts[pde]) {
|
|
dma_addr_t dma;
|
|
|
|
dma = dma_map_page(smmu->dev, page, 0, SMMU_SIZE_PT,
|
|
DMA_TO_DEVICE);
|
|
if (dma_mapping_error(smmu->dev, dma)) {
|
|
__free_page(page);
|
|
return NULL;
|
|
}
|
|
|
|
if (!smmu_dma_addr_valid(smmu, dma)) {
|
|
dma_unmap_page(smmu->dev, dma, SMMU_SIZE_PT,
|
|
DMA_TO_DEVICE);
|
|
__free_page(page);
|
|
return NULL;
|
|
}
|
|
|
|
as->pts[pde] = page;
|
|
|
|
tegra_smmu_set_pde(as, iova, SMMU_MK_PDE(dma, SMMU_PDE_ATTR |
|
|
SMMU_PDE_NEXT));
|
|
|
|
*dmap = dma;
|
|
} else {
|
|
u32 *pd = page_address(as->pd);
|
|
|
|
*dmap = smmu_pde_to_dma(smmu, pd[pde]);
|
|
}
|
|
|
|
return tegra_smmu_pte_offset(as->pts[pde], iova);
|
|
}
|
|
|
|
static void tegra_smmu_pte_get_use(struct tegra_smmu_as *as, unsigned long iova)
|
|
{
|
|
unsigned int pd_index = iova_pd_index(iova);
|
|
|
|
as->count[pd_index]++;
|
|
}
|
|
|
|
static void tegra_smmu_pte_put_use(struct tegra_smmu_as *as, unsigned long iova)
|
|
{
|
|
unsigned int pde = iova_pd_index(iova);
|
|
struct page *page = as->pts[pde];
|
|
|
|
/*
|
|
* When no entries in this page table are used anymore, return the
|
|
* memory page to the system.
|
|
*/
|
|
if (--as->count[pde] == 0) {
|
|
struct tegra_smmu *smmu = as->smmu;
|
|
u32 *pd = page_address(as->pd);
|
|
dma_addr_t pte_dma = smmu_pde_to_dma(smmu, pd[pde]);
|
|
|
|
tegra_smmu_set_pde(as, iova, 0);
|
|
|
|
dma_unmap_page(smmu->dev, pte_dma, SMMU_SIZE_PT, DMA_TO_DEVICE);
|
|
__free_page(page);
|
|
as->pts[pde] = NULL;
|
|
}
|
|
}
|
|
|
|
static void tegra_smmu_set_pte(struct tegra_smmu_as *as, unsigned long iova,
|
|
u32 *pte, dma_addr_t pte_dma, u32 val)
|
|
{
|
|
struct tegra_smmu *smmu = as->smmu;
|
|
unsigned long offset = SMMU_OFFSET_IN_PAGE(pte);
|
|
|
|
*pte = val;
|
|
|
|
dma_sync_single_range_for_device(smmu->dev, pte_dma, offset,
|
|
4, DMA_TO_DEVICE);
|
|
smmu_flush_ptc(smmu, pte_dma, offset);
|
|
smmu_flush_tlb_group(smmu, as->id, iova);
|
|
smmu_flush(smmu);
|
|
}
|
|
|
|
static struct page *as_get_pde_page(struct tegra_smmu_as *as,
|
|
unsigned long iova, gfp_t gfp,
|
|
unsigned long *flags)
|
|
{
|
|
unsigned int pde = iova_pd_index(iova);
|
|
struct page *page = as->pts[pde];
|
|
|
|
/* at first check whether allocation needs to be done at all */
|
|
if (page)
|
|
return page;
|
|
|
|
/*
|
|
* In order to prevent exhaustion of the atomic memory pool, we
|
|
* allocate page in a sleeping context if GFP flags permit. Hence
|
|
* spinlock needs to be unlocked and re-locked after allocation.
|
|
*/
|
|
if (!(gfp & __GFP_ATOMIC))
|
|
spin_unlock_irqrestore(&as->lock, *flags);
|
|
|
|
page = alloc_page(gfp | __GFP_DMA | __GFP_ZERO);
|
|
|
|
if (!(gfp & __GFP_ATOMIC))
|
|
spin_lock_irqsave(&as->lock, *flags);
|
|
|
|
/*
|
|
* In a case of blocking allocation, a concurrent mapping may win
|
|
* the PDE allocation. In this case the allocated page isn't needed
|
|
* if allocation succeeded and the allocation failure isn't fatal.
|
|
*/
|
|
if (as->pts[pde]) {
|
|
if (page)
|
|
__free_page(page);
|
|
|
|
page = as->pts[pde];
|
|
}
|
|
|
|
return page;
|
|
}
|
|
|
|
static int
|
|
__tegra_smmu_map(struct iommu_domain *domain, unsigned long iova,
|
|
phys_addr_t paddr, size_t size, int prot, gfp_t gfp,
|
|
unsigned long *flags)
|
|
{
|
|
struct tegra_smmu_as *as = to_smmu_as(domain);
|
|
dma_addr_t pte_dma;
|
|
struct page *page;
|
|
u32 pte_attrs;
|
|
u32 *pte;
|
|
|
|
page = as_get_pde_page(as, iova, gfp, flags);
|
|
if (!page)
|
|
return -ENOMEM;
|
|
|
|
pte = as_get_pte(as, iova, &pte_dma, page);
|
|
if (!pte)
|
|
return -ENOMEM;
|
|
|
|
/* If we aren't overwriting a pre-existing entry, increment use */
|
|
if (*pte == 0)
|
|
tegra_smmu_pte_get_use(as, iova);
|
|
|
|
pte_attrs = SMMU_PTE_NONSECURE;
|
|
|
|
if (prot & IOMMU_READ)
|
|
pte_attrs |= SMMU_PTE_READABLE;
|
|
|
|
if (prot & IOMMU_WRITE)
|
|
pte_attrs |= SMMU_PTE_WRITABLE;
|
|
|
|
tegra_smmu_set_pte(as, iova, pte, pte_dma,
|
|
SMMU_PHYS_PFN(paddr) | pte_attrs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static size_t
|
|
__tegra_smmu_unmap(struct iommu_domain *domain, unsigned long iova,
|
|
size_t size, struct iommu_iotlb_gather *gather)
|
|
{
|
|
struct tegra_smmu_as *as = to_smmu_as(domain);
|
|
dma_addr_t pte_dma;
|
|
u32 *pte;
|
|
|
|
pte = tegra_smmu_pte_lookup(as, iova, &pte_dma);
|
|
if (!pte || !*pte)
|
|
return 0;
|
|
|
|
tegra_smmu_set_pte(as, iova, pte, pte_dma, 0);
|
|
tegra_smmu_pte_put_use(as, iova);
|
|
|
|
return size;
|
|
}
|
|
|
|
static int tegra_smmu_map(struct iommu_domain *domain, unsigned long iova,
|
|
phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
|
|
{
|
|
struct tegra_smmu_as *as = to_smmu_as(domain);
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&as->lock, flags);
|
|
ret = __tegra_smmu_map(domain, iova, paddr, size, prot, gfp, &flags);
|
|
spin_unlock_irqrestore(&as->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static size_t tegra_smmu_unmap(struct iommu_domain *domain, unsigned long iova,
|
|
size_t size, struct iommu_iotlb_gather *gather)
|
|
{
|
|
struct tegra_smmu_as *as = to_smmu_as(domain);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&as->lock, flags);
|
|
size = __tegra_smmu_unmap(domain, iova, size, gather);
|
|
spin_unlock_irqrestore(&as->lock, flags);
|
|
|
|
return size;
|
|
}
|
|
|
|
static phys_addr_t tegra_smmu_iova_to_phys(struct iommu_domain *domain,
|
|
dma_addr_t iova)
|
|
{
|
|
struct tegra_smmu_as *as = to_smmu_as(domain);
|
|
unsigned long pfn;
|
|
dma_addr_t pte_dma;
|
|
u32 *pte;
|
|
|
|
pte = tegra_smmu_pte_lookup(as, iova, &pte_dma);
|
|
if (!pte || !*pte)
|
|
return 0;
|
|
|
|
pfn = *pte & as->smmu->pfn_mask;
|
|
|
|
return SMMU_PFN_PHYS(pfn) + SMMU_OFFSET_IN_PAGE(iova);
|
|
}
|
|
|
|
static struct tegra_smmu *tegra_smmu_find(struct device_node *np)
|
|
{
|
|
struct platform_device *pdev;
|
|
struct tegra_mc *mc;
|
|
|
|
pdev = of_find_device_by_node(np);
|
|
if (!pdev)
|
|
return NULL;
|
|
|
|
mc = platform_get_drvdata(pdev);
|
|
if (!mc)
|
|
return NULL;
|
|
|
|
return mc->smmu;
|
|
}
|
|
|
|
static int tegra_smmu_configure(struct tegra_smmu *smmu, struct device *dev,
|
|
struct of_phandle_args *args)
|
|
{
|
|
const struct iommu_ops *ops = smmu->iommu.ops;
|
|
int err;
|
|
|
|
err = iommu_fwspec_init(dev, &dev->of_node->fwnode, ops);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to initialize fwspec: %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
err = ops->of_xlate(dev, args);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to parse SW group ID: %d\n", err);
|
|
iommu_fwspec_free(dev);
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct iommu_device *tegra_smmu_probe_device(struct device *dev)
|
|
{
|
|
struct device_node *np = dev->of_node;
|
|
struct tegra_smmu *smmu = NULL;
|
|
struct of_phandle_args args;
|
|
unsigned int index = 0;
|
|
int err;
|
|
|
|
while (of_parse_phandle_with_args(np, "iommus", "#iommu-cells", index,
|
|
&args) == 0) {
|
|
smmu = tegra_smmu_find(args.np);
|
|
if (smmu) {
|
|
err = tegra_smmu_configure(smmu, dev, &args);
|
|
|
|
if (err < 0) {
|
|
of_node_put(args.np);
|
|
return ERR_PTR(err);
|
|
}
|
|
}
|
|
|
|
of_node_put(args.np);
|
|
index++;
|
|
}
|
|
|
|
smmu = dev_iommu_priv_get(dev);
|
|
if (!smmu)
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
return &smmu->iommu;
|
|
}
|
|
|
|
static void tegra_smmu_release_device(struct device *dev) {}
|
|
|
|
static const struct tegra_smmu_group_soc *
|
|
tegra_smmu_find_group(struct tegra_smmu *smmu, unsigned int swgroup)
|
|
{
|
|
unsigned int i, j;
|
|
|
|
for (i = 0; i < smmu->soc->num_groups; i++)
|
|
for (j = 0; j < smmu->soc->groups[i].num_swgroups; j++)
|
|
if (smmu->soc->groups[i].swgroups[j] == swgroup)
|
|
return &smmu->soc->groups[i];
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void tegra_smmu_group_release(void *iommu_data)
|
|
{
|
|
struct tegra_smmu_group *group = iommu_data;
|
|
struct tegra_smmu *smmu = group->smmu;
|
|
|
|
mutex_lock(&smmu->lock);
|
|
list_del(&group->list);
|
|
mutex_unlock(&smmu->lock);
|
|
}
|
|
|
|
static struct iommu_group *tegra_smmu_device_group(struct device *dev)
|
|
{
|
|
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
|
|
struct tegra_smmu *smmu = dev_iommu_priv_get(dev);
|
|
const struct tegra_smmu_group_soc *soc;
|
|
unsigned int swgroup = fwspec->ids[0];
|
|
struct tegra_smmu_group *group;
|
|
struct iommu_group *grp;
|
|
|
|
/* Find group_soc associating with swgroup */
|
|
soc = tegra_smmu_find_group(smmu, swgroup);
|
|
|
|
mutex_lock(&smmu->lock);
|
|
|
|
/* Find existing iommu_group associating with swgroup or group_soc */
|
|
list_for_each_entry(group, &smmu->groups, list)
|
|
if ((group->swgroup == swgroup) || (soc && group->soc == soc)) {
|
|
grp = iommu_group_ref_get(group->group);
|
|
mutex_unlock(&smmu->lock);
|
|
return grp;
|
|
}
|
|
|
|
group = devm_kzalloc(smmu->dev, sizeof(*group), GFP_KERNEL);
|
|
if (!group) {
|
|
mutex_unlock(&smmu->lock);
|
|
return NULL;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&group->list);
|
|
group->swgroup = swgroup;
|
|
group->smmu = smmu;
|
|
group->soc = soc;
|
|
|
|
if (dev_is_pci(dev))
|
|
group->group = pci_device_group(dev);
|
|
else
|
|
group->group = generic_device_group(dev);
|
|
|
|
if (IS_ERR(group->group)) {
|
|
devm_kfree(smmu->dev, group);
|
|
mutex_unlock(&smmu->lock);
|
|
return NULL;
|
|
}
|
|
|
|
iommu_group_set_iommudata(group->group, group, tegra_smmu_group_release);
|
|
if (soc)
|
|
iommu_group_set_name(group->group, soc->name);
|
|
list_add_tail(&group->list, &smmu->groups);
|
|
mutex_unlock(&smmu->lock);
|
|
|
|
return group->group;
|
|
}
|
|
|
|
static int tegra_smmu_of_xlate(struct device *dev,
|
|
struct of_phandle_args *args)
|
|
{
|
|
struct platform_device *iommu_pdev = of_find_device_by_node(args->np);
|
|
struct tegra_mc *mc = platform_get_drvdata(iommu_pdev);
|
|
u32 id = args->args[0];
|
|
|
|
/*
|
|
* Note: we are here releasing the reference of &iommu_pdev->dev, which
|
|
* is mc->dev. Although some functions in tegra_smmu_ops may keep using
|
|
* its private data beyond this point, it's still safe to do so because
|
|
* the SMMU parent device is the same as the MC, so the reference count
|
|
* isn't strictly necessary.
|
|
*/
|
|
put_device(&iommu_pdev->dev);
|
|
|
|
dev_iommu_priv_set(dev, mc->smmu);
|
|
|
|
return iommu_fwspec_add_ids(dev, &id, 1);
|
|
}
|
|
|
|
static const struct iommu_ops tegra_smmu_ops = {
|
|
.capable = tegra_smmu_capable,
|
|
.domain_alloc = tegra_smmu_domain_alloc,
|
|
.domain_free = tegra_smmu_domain_free,
|
|
.attach_dev = tegra_smmu_attach_dev,
|
|
.detach_dev = tegra_smmu_detach_dev,
|
|
.probe_device = tegra_smmu_probe_device,
|
|
.release_device = tegra_smmu_release_device,
|
|
.device_group = tegra_smmu_device_group,
|
|
.map = tegra_smmu_map,
|
|
.unmap = tegra_smmu_unmap,
|
|
.iova_to_phys = tegra_smmu_iova_to_phys,
|
|
.of_xlate = tegra_smmu_of_xlate,
|
|
.pgsize_bitmap = SZ_4K,
|
|
};
|
|
|
|
static void tegra_smmu_ahb_enable(void)
|
|
{
|
|
static const struct of_device_id ahb_match[] = {
|
|
{ .compatible = "nvidia,tegra30-ahb", },
|
|
{ }
|
|
};
|
|
struct device_node *ahb;
|
|
|
|
ahb = of_find_matching_node(NULL, ahb_match);
|
|
if (ahb) {
|
|
tegra_ahb_enable_smmu(ahb);
|
|
of_node_put(ahb);
|
|
}
|
|
}
|
|
|
|
static int tegra_smmu_swgroups_show(struct seq_file *s, void *data)
|
|
{
|
|
struct tegra_smmu *smmu = s->private;
|
|
unsigned int i;
|
|
u32 value;
|
|
|
|
seq_printf(s, "swgroup enabled ASID\n");
|
|
seq_printf(s, "------------------------\n");
|
|
|
|
for (i = 0; i < smmu->soc->num_swgroups; i++) {
|
|
const struct tegra_smmu_swgroup *group = &smmu->soc->swgroups[i];
|
|
const char *status;
|
|
unsigned int asid;
|
|
|
|
value = smmu_readl(smmu, group->reg);
|
|
|
|
if (value & SMMU_ASID_ENABLE)
|
|
status = "yes";
|
|
else
|
|
status = "no";
|
|
|
|
asid = value & SMMU_ASID_MASK;
|
|
|
|
seq_printf(s, "%-9s %-7s %#04x\n", group->name, status,
|
|
asid);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
DEFINE_SHOW_ATTRIBUTE(tegra_smmu_swgroups);
|
|
|
|
static int tegra_smmu_clients_show(struct seq_file *s, void *data)
|
|
{
|
|
struct tegra_smmu *smmu = s->private;
|
|
unsigned int i;
|
|
u32 value;
|
|
|
|
seq_printf(s, "client enabled\n");
|
|
seq_printf(s, "--------------------\n");
|
|
|
|
for (i = 0; i < smmu->soc->num_clients; i++) {
|
|
const struct tegra_mc_client *client = &smmu->soc->clients[i];
|
|
const char *status;
|
|
|
|
value = smmu_readl(smmu, client->regs.smmu.reg);
|
|
|
|
if (value & BIT(client->regs.smmu.bit))
|
|
status = "yes";
|
|
else
|
|
status = "no";
|
|
|
|
seq_printf(s, "%-12s %s\n", client->name, status);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
DEFINE_SHOW_ATTRIBUTE(tegra_smmu_clients);
|
|
|
|
static void tegra_smmu_debugfs_init(struct tegra_smmu *smmu)
|
|
{
|
|
smmu->debugfs = debugfs_create_dir("smmu", NULL);
|
|
if (!smmu->debugfs)
|
|
return;
|
|
|
|
debugfs_create_file("swgroups", S_IRUGO, smmu->debugfs, smmu,
|
|
&tegra_smmu_swgroups_fops);
|
|
debugfs_create_file("clients", S_IRUGO, smmu->debugfs, smmu,
|
|
&tegra_smmu_clients_fops);
|
|
}
|
|
|
|
static void tegra_smmu_debugfs_exit(struct tegra_smmu *smmu)
|
|
{
|
|
debugfs_remove_recursive(smmu->debugfs);
|
|
}
|
|
|
|
struct tegra_smmu *tegra_smmu_probe(struct device *dev,
|
|
const struct tegra_smmu_soc *soc,
|
|
struct tegra_mc *mc)
|
|
{
|
|
struct tegra_smmu *smmu;
|
|
size_t size;
|
|
u32 value;
|
|
int err;
|
|
|
|
smmu = devm_kzalloc(dev, sizeof(*smmu), GFP_KERNEL);
|
|
if (!smmu)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
/*
|
|
* This is a bit of a hack. Ideally we'd want to simply return this
|
|
* value. However the IOMMU registration process will attempt to add
|
|
* all devices to the IOMMU when bus_set_iommu() is called. In order
|
|
* not to rely on global variables to track the IOMMU instance, we
|
|
* set it here so that it can be looked up from the .probe_device()
|
|
* callback via the IOMMU device's .drvdata field.
|
|
*/
|
|
mc->smmu = smmu;
|
|
|
|
size = BITS_TO_LONGS(soc->num_asids) * sizeof(long);
|
|
|
|
smmu->asids = devm_kzalloc(dev, size, GFP_KERNEL);
|
|
if (!smmu->asids)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
INIT_LIST_HEAD(&smmu->groups);
|
|
mutex_init(&smmu->lock);
|
|
|
|
smmu->regs = mc->regs;
|
|
smmu->soc = soc;
|
|
smmu->dev = dev;
|
|
smmu->mc = mc;
|
|
|
|
smmu->pfn_mask =
|
|
BIT_MASK(mc->soc->num_address_bits - SMMU_PTE_SHIFT) - 1;
|
|
dev_dbg(dev, "address bits: %u, PFN mask: %#lx\n",
|
|
mc->soc->num_address_bits, smmu->pfn_mask);
|
|
smmu->tlb_mask = (1 << fls(smmu->soc->num_tlb_lines)) - 1;
|
|
dev_dbg(dev, "TLB lines: %u, mask: %#lx\n", smmu->soc->num_tlb_lines,
|
|
smmu->tlb_mask);
|
|
|
|
value = SMMU_PTC_CONFIG_ENABLE | SMMU_PTC_CONFIG_INDEX_MAP(0x3f);
|
|
|
|
if (soc->supports_request_limit)
|
|
value |= SMMU_PTC_CONFIG_REQ_LIMIT(8);
|
|
|
|
smmu_writel(smmu, value, SMMU_PTC_CONFIG);
|
|
|
|
value = SMMU_TLB_CONFIG_HIT_UNDER_MISS |
|
|
SMMU_TLB_CONFIG_ACTIVE_LINES(smmu);
|
|
|
|
if (soc->supports_round_robin_arbitration)
|
|
value |= SMMU_TLB_CONFIG_ROUND_ROBIN_ARBITRATION;
|
|
|
|
smmu_writel(smmu, value, SMMU_TLB_CONFIG);
|
|
|
|
smmu_flush_ptc_all(smmu);
|
|
smmu_flush_tlb(smmu);
|
|
smmu_writel(smmu, SMMU_CONFIG_ENABLE, SMMU_CONFIG);
|
|
smmu_flush(smmu);
|
|
|
|
tegra_smmu_ahb_enable();
|
|
|
|
err = iommu_device_sysfs_add(&smmu->iommu, dev, NULL, dev_name(dev));
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
|
|
err = iommu_device_register(&smmu->iommu, &tegra_smmu_ops, dev);
|
|
if (err)
|
|
goto remove_sysfs;
|
|
|
|
err = bus_set_iommu(&platform_bus_type, &tegra_smmu_ops);
|
|
if (err < 0)
|
|
goto unregister;
|
|
|
|
#ifdef CONFIG_PCI
|
|
err = bus_set_iommu(&pci_bus_type, &tegra_smmu_ops);
|
|
if (err < 0)
|
|
goto unset_platform_bus;
|
|
#endif
|
|
|
|
if (IS_ENABLED(CONFIG_DEBUG_FS))
|
|
tegra_smmu_debugfs_init(smmu);
|
|
|
|
return smmu;
|
|
|
|
unset_platform_bus: __maybe_unused;
|
|
bus_set_iommu(&platform_bus_type, NULL);
|
|
unregister:
|
|
iommu_device_unregister(&smmu->iommu);
|
|
remove_sysfs:
|
|
iommu_device_sysfs_remove(&smmu->iommu);
|
|
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
void tegra_smmu_remove(struct tegra_smmu *smmu)
|
|
{
|
|
iommu_device_unregister(&smmu->iommu);
|
|
iommu_device_sysfs_remove(&smmu->iommu);
|
|
|
|
if (IS_ENABLED(CONFIG_DEBUG_FS))
|
|
tegra_smmu_debugfs_exit(smmu);
|
|
}
|