drivers/iommu/tegra-smmu.c

Source file repositories/reference/linux-study-clean/drivers/iommu/tegra-smmu.c

File Facts

System
Linux kernel
Corpus path
drivers/iommu/tegra-smmu.c
Extension
.c
Size
28612 bytes
Lines
1193
Domain
Driver Families
Bucket
drivers/iommu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct tegra_smmu_group {
	struct list_head list;
	struct tegra_smmu *smmu;
	const struct tegra_smmu_group_soc *soc;
	struct iommu_group *group;
	unsigned int swgroup;
};

struct tegra_smmu {
	void __iomem *regs;
	struct device *dev;

	struct tegra_mc *mc;
	const struct tegra_smmu_soc *soc;

	struct list_head groups;

	unsigned long pfn_mask;
	unsigned long tlb_mask;

	unsigned long *asids;
	struct mutex lock;

	struct list_head list;

	struct dentry *debugfs;

	struct iommu_device iommu;	/* IOMMU Core code handle */
};

struct tegra_pd;
struct tegra_pt;

struct tegra_smmu_as {
	struct iommu_domain domain;
	struct tegra_smmu *smmu;
	unsigned int use_count;
	spinlock_t lock;
	u32 *count;
	struct tegra_pt **pts;
	struct tegra_pd *pd;
	dma_addr_t pd_dma;
	unsigned id;
	u32 attr;
};

static struct tegra_smmu_as *to_smmu_as(struct iommu_domain *dom)
{
	return container_of(dom, struct tegra_smmu_as, domain);
}

static inline void smmu_writel(struct tegra_smmu *smmu, u32 value,
			       unsigned long offset)
{
	writel(value, smmu->regs + offset);
}

static inline u32 smmu_readl(struct tegra_smmu *smmu, unsigned long offset)
{
	return readl(smmu->regs + offset);
}

#define SMMU_CONFIG 0x010
#define  SMMU_CONFIG_ENABLE (1 << 0)

#define SMMU_TLB_CONFIG 0x14
#define  SMMU_TLB_CONFIG_HIT_UNDER_MISS (1 << 29)
#define  SMMU_TLB_CONFIG_ROUND_ROBIN_ARBITRATION (1 << 28)
#define  SMMU_TLB_CONFIG_ACTIVE_LINES(smmu) \
	((smmu)->soc->num_tlb_lines & (smmu)->tlb_mask)

#define SMMU_PTC_CONFIG 0x18
#define  SMMU_PTC_CONFIG_ENABLE (1 << 29)
#define  SMMU_PTC_CONFIG_REQ_LIMIT(x) (((x) & 0x0f) << 24)
#define  SMMU_PTC_CONFIG_INDEX_MAP(x) ((x) & 0x3f)

#define SMMU_PTB_ASID 0x01c
#define  SMMU_PTB_ASID_VALUE(x) ((x) & 0x7f)

#define SMMU_PTB_DATA 0x020
#define  SMMU_PTB_DATA_VALUE(dma, attr) ((dma) >> 12 | (attr))

#define SMMU_MK_PDE(dma, attr) ((dma) >> SMMU_PTE_SHIFT | (attr))

#define SMMU_TLB_FLUSH 0x030
#define  SMMU_TLB_FLUSH_VA_MATCH_ALL     (0 << 0)
#define  SMMU_TLB_FLUSH_VA_MATCH_SECTION (2 << 0)
#define  SMMU_TLB_FLUSH_VA_MATCH_GROUP   (3 << 0)
#define  SMMU_TLB_FLUSH_VA_SECTION(addr) ((((addr) & 0xffc00000) >> 12) | \
					  SMMU_TLB_FLUSH_VA_MATCH_SECTION)

Annotation

Implementation Notes