drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowpci.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowpci.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowpci.c
Extension
.c
Size
3173 bytes
Lines
135
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 priv {
	struct pci_dev *pdev;
	void __iomem *rom;
	size_t size;
};

static u32
pcirom_read(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
{
	struct priv *priv = data;
	if (offset + length <= priv->size) {
		memcpy_fromio(bios->data + offset, priv->rom + offset, length);
		return length;
	}
	return 0;
}

static void
pcirom_fini(void *data)
{
	struct priv *priv = data;
	pci_unmap_rom(priv->pdev, priv->rom);
	pci_disable_rom(priv->pdev);
	kfree(priv);
}

static void *
pcirom_init(struct nvkm_bios *bios, const char *name)
{
	struct nvkm_device *device = bios->subdev.device;
	struct priv *priv = NULL;
	struct pci_dev *pdev;
	int ret;

	if (device->func->pci)
		pdev = device->func->pci(device)->pdev;
	else
		return ERR_PTR(-ENODEV);

	if (!(ret = pci_enable_rom(pdev))) {
		if (ret = -ENOMEM,
		    (priv = kmalloc_obj(*priv))) {
			if (ret = -EFAULT,
			    (priv->rom = pci_map_rom(pdev, &priv->size))) {
				priv->pdev = pdev;
				return priv;
			}
			kfree(priv);
		}
		pci_disable_rom(pdev);
	}

	return ERR_PTR(ret);
}

const struct nvbios_source
nvbios_pcirom = {
	.name = "PCIROM",
	.init = pcirom_init,
	.fini = pcirom_fini,
	.read = pcirom_read,
	.rw = true,
};

static void *
platform_init(struct nvkm_bios *bios, const char *name)
{
	struct nvkm_device *device = bios->subdev.device;
	struct pci_dev *pdev;
	struct priv *priv;
	int ret = -ENOMEM;

	if (device->func->pci)
		pdev = device->func->pci(device)->pdev;
	else
		return ERR_PTR(-ENODEV);

	if (!pdev->rom || pdev->romlen == 0)
		return ERR_PTR(-ENODEV);

	if ((priv = kmalloc_obj(*priv))) {
		priv->size = pdev->romlen;
		if (ret = -ENODEV,
		    (priv->rom = ioremap(pdev->rom, pdev->romlen)))
			return priv;
		kfree(priv);
	}

	return ERR_PTR(ret);
}

Annotation

Implementation Notes