drivers/media/pci/intel/ipu6/ipu6-mmu.h

Source file repositories/reference/linux-study-clean/drivers/media/pci/intel/ipu6/ipu6-mmu.h

File Facts

System
Linux kernel
Corpus path
drivers/media/pci/intel/ipu6/ipu6-mmu.h
Extension
.h
Size
1736 bytes
Lines
74
Domain
Driver Families
Bucket
drivers/media
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 ipu6_mmu_info {
	struct device *dev;

	u32 *l1_pt;
	u32 l1_pt_dma;
	u32 **l2_pts;

	u32 *dummy_l2_pt;
	u32 dummy_l2_pteval;
	void *dummy_page;
	u32 dummy_page_pteval;

	dma_addr_t aperture_start;
	dma_addr_t aperture_end;
	unsigned long pgsize_bitmap;

	spinlock_t lock;	/* Serialize access to users */
	struct ipu6_dma_mapping *dmap;
};

struct ipu6_mmu {
	struct list_head node;

	struct ipu6_mmu_hw *mmu_hw;
	unsigned int nr_mmus;
	unsigned int mmid;

	phys_addr_t pgtbl;
	struct device *dev;

	struct ipu6_dma_mapping *dmap;
	struct list_head vma_list;

	struct page *trash_page;
	dma_addr_t pci_trash_page; /* IOVA from PCI DMA services (parent) */
	dma_addr_t iova_trash_page; /* IOVA for IPU6 child nodes to use */

	bool ready;
	spinlock_t ready_lock;	/* Serialize access to bool ready */

	void (*tlb_invalidate)(struct ipu6_mmu *mmu);
};

struct ipu6_mmu *ipu6_mmu_init(struct device *dev,
			       void __iomem *base, int mmid,
			       const struct ipu6_hw_variants *hw);
void ipu6_mmu_cleanup(struct ipu6_mmu *mmu);
int ipu6_mmu_hw_init(struct ipu6_mmu *mmu);
void ipu6_mmu_hw_cleanup(struct ipu6_mmu *mmu);
int ipu6_mmu_map(struct ipu6_mmu_info *mmu_info, unsigned long iova,
		 phys_addr_t paddr, size_t size);
void ipu6_mmu_unmap(struct ipu6_mmu_info *mmu_info, unsigned long iova,
		    size_t size);
phys_addr_t ipu6_mmu_iova_to_phys(struct ipu6_mmu_info *mmu_info,
				  dma_addr_t iova);
#endif

Annotation

Implementation Notes