drivers/gpu/drm/nouveau/nvc0_fence.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nvc0_fence.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvc0_fence.c
Extension
.c
Size
2920 bytes
Lines
99
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

#include "nouveau_drv.h"
#include "nouveau_dma.h"
#include "nouveau_fence.h"

#include "nv50_display.h"

#include <nvif/push906f.h>

#include <nvhw/class/cl906f.h>

static int
nvc0_fence_emit32(struct nouveau_channel *chan, u64 virtual, u32 sequence)
{
	struct nvif_push *push = &chan->chan.push;
	int ret = PUSH_WAIT(push, 6);
	if (ret == 0) {
		PUSH_MTHD(push, NV906F, SEMAPHOREA,
			  NVVAL(NV906F, SEMAPHOREA, OFFSET_UPPER, upper_32_bits(virtual)),

					SEMAPHOREB, lower_32_bits(virtual),
					SEMAPHOREC, sequence,

					SEMAPHORED,
			  NVDEF(NV906F, SEMAPHORED, OPERATION, RELEASE) |
			  NVDEF(NV906F, SEMAPHORED, RELEASE_WFI, EN) |
			  NVDEF(NV906F, SEMAPHORED, RELEASE_SIZE, 16BYTE),

					NON_STALL_INTERRUPT, 0);
		PUSH_KICK(push);
	}
	return ret;
}

static int
nvc0_fence_sync32(struct nouveau_channel *chan, u64 virtual, u32 sequence)
{
	struct nvif_push *push = &chan->chan.push;
	int ret = PUSH_WAIT(push, 5);
	if (ret == 0) {
		PUSH_MTHD(push, NV906F, SEMAPHOREA,
			  NVVAL(NV906F, SEMAPHOREA, OFFSET_UPPER, upper_32_bits(virtual)),

					SEMAPHOREB, lower_32_bits(virtual),
					SEMAPHOREC, sequence,

					SEMAPHORED,
			  NVDEF(NV906F, SEMAPHORED, OPERATION, ACQ_GEQ) |
			  NVDEF(NV906F, SEMAPHORED, ACQUIRE_SWITCH, ENABLED));
		PUSH_KICK(push);
	}
	return ret;
}

static int
nvc0_fence_context_new(struct nouveau_channel *chan)
{
	int ret = nv84_fence_context_new(chan);
	if (ret == 0) {
		struct nv84_fence_chan *fctx = chan->fence;
		fctx->base.emit32 = nvc0_fence_emit32;
		fctx->base.sync32 = nvc0_fence_sync32;
	}
	return ret;
}

int
nvc0_fence_create(struct nouveau_drm *drm)
{
	int ret = nv84_fence_create(drm);
	if (ret == 0) {
		struct nv84_fence_priv *priv = drm->fence;
		priv->base.context_new = nvc0_fence_context_new;
	}
	return ret;
}

Annotation

Implementation Notes