drivers/gpu/drm/nouveau/nvkm/subdev/fb/ramfuc.h

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nvkm/subdev/fb/ramfuc.h

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvkm/subdev/fb/ramfuc.h
Extension
.h
Size
3891 bytes
Lines
179
Domain
Driver Families
Bucket
drivers/gpu
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 ramfuc {
	struct nvkm_memx *memx;
	struct nvkm_fb *fb;
	int sequence;
};

struct ramfuc_reg {
	int sequence;
	bool force;
	u32 addr;
	u32 stride; /* in bytes */
	u32 mask;
	u32 data;
};

static inline struct ramfuc_reg
ramfuc_stride(u32 addr, u32 stride, u32 mask)
{
	return (struct ramfuc_reg) {
		.sequence = 0,
		.addr = addr,
		.stride = stride,
		.mask = mask,
		.data = 0xdeadbeef,
	};
}

static inline struct ramfuc_reg
ramfuc_reg2(u32 addr1, u32 addr2)
{
	return (struct ramfuc_reg) {
		.sequence = 0,
		.addr = addr1,
		.stride = addr2 - addr1,
		.mask = 0x3,
		.data = 0xdeadbeef,
	};
}

static noinline struct ramfuc_reg
ramfuc_reg(u32 addr)
{
	return (struct ramfuc_reg) {
		.sequence = 0,
		.addr = addr,
		.stride = 0,
		.mask = 0x1,
		.data = 0xdeadbeef,
	};
}

static inline int
ramfuc_init(struct ramfuc *ram, struct nvkm_fb *fb)
{
	int ret = nvkm_memx_init(fb->subdev.device->pmu, &ram->memx);
	if (ret)
		return ret;

	ram->sequence++;
	ram->fb = fb;
	return 0;
}

static inline int
ramfuc_exec(struct ramfuc *ram, bool exec)
{
	int ret = 0;
	if (ram->fb) {
		ret = nvkm_memx_fini(&ram->memx, exec);
		ram->fb = NULL;
	}
	return ret;
}

static inline u32
ramfuc_rd32(struct ramfuc *ram, struct ramfuc_reg *reg)
{
	struct nvkm_device *device = ram->fb->subdev.device;
	if (reg->sequence != ram->sequence)
		reg->data = nvkm_rd32(device, reg->addr);
	return reg->data;
}

static inline void
ramfuc_wr32(struct ramfuc *ram, struct ramfuc_reg *reg, u32 data)
{
	unsigned int mask, off = 0;

	reg->sequence = ram->sequence;
	reg->data = data;

Annotation

Implementation Notes