drivers/gpu/drm/nouveau/nv50_fence.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nv50_fence.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nv50_fence.c
Extension
.c
Size
2811 bytes
Lines
93
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 <nvif/os.h>
#include <nvif/class.h>
#include <nvif/cl0002.h>

#include "nouveau_drv.h"
#include "nouveau_dma.h"
#include "nv10_fence.h"

#include "nv50_display.h"

static int
nv50_fence_context_new(struct nouveau_channel *chan)
{
	struct nv10_fence_priv *priv = chan->cli->drm->fence;
	struct nv10_fence_chan *fctx;
	struct ttm_resource *reg = priv->bo->bo.resource;
	u32 start = reg->start * PAGE_SIZE;
	u32 limit = start + priv->bo->bo.base.size - 1;
	int ret;

	fctx = chan->fence = kzalloc_obj(*fctx);
	if (!fctx)
		return -ENOMEM;

	nouveau_fence_context_new(chan, &fctx->base);
	fctx->base.emit = nv10_fence_emit;
	fctx->base.read = nv10_fence_read;
	fctx->base.sync = nv17_fence_sync;

	ret = nvif_object_ctor(&chan->user, "fenceCtxDma", NvSema,
			       NV_DMA_IN_MEMORY,
			       &(struct nv_dma_v0) {
					.target = NV_DMA_V0_TARGET_VRAM,
					.access = NV_DMA_V0_ACCESS_RDWR,
					.start = start,
					.limit = limit,
			       }, sizeof(struct nv_dma_v0),
			       &fctx->sema);
	if (ret)
		nv10_fence_context_del(chan);
	return ret;
}

int
nv50_fence_create(struct nouveau_drm *drm)
{
	struct nv10_fence_priv *priv;
	int ret = 0;

	priv = drm->fence = kzalloc_obj(*priv);
	if (!priv)
		return -ENOMEM;

	priv->base.dtor = nv10_fence_destroy;
	priv->base.resume = nv17_fence_resume;
	priv->base.context_new = nv50_fence_context_new;
	priv->base.context_del = nv10_fence_context_del;
	spin_lock_init(&priv->lock);

	ret = nouveau_bo_new_map(&drm->client, NOUVEAU_GEM_DOMAIN_VRAM, PAGE_SIZE, &priv->bo);
	if (ret) {
		nv10_fence_destroy(drm);
		return ret;
	}

	nouveau_bo_wr32(priv->bo, 0x000, 0x00000000);
	return ret;
}

Annotation

Implementation Notes