cregit-Linux how code gets into the kernel

Release 4.11 drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowpci.c

/*
 * Copyright 2012 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 */
#include "priv.h"

#include <core/pci.h>


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; }

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

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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(sizeof(*priv), GFP_KERNEL))) { 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); }

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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 ((priv = kmalloc(sizeof(*priv), GFP_KERNEL))) { if (ret = -ENODEV, (priv->rom = pci_platform_rom(pdev, &priv->size))) return priv; kfree(priv); } return ERR_PTR(ret); }

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const struct nvbios_source nvbios_platform = { .name = "PLATFORM", .init = platform_init, .fini = (void(*)(void *))kfree, .read = pcirom_read, .rw = true, };

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