cregit-Linux how code gets into the kernel

Release 4.11 drivers/gpu/drm/nouveau/nvkm/subdev/top/base.c

/*
 * Copyright 2016 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.
 *
 * Authors: Ben Skeggs <bskeggs@redhat.com>
 */
#include "priv.h"


struct nvkm_top_device * nvkm_top_device_new(struct nvkm_top *top) { struct nvkm_top_device *info = kmalloc(sizeof(*info), GFP_KERNEL); if (info) { info->index = NVKM_SUBDEV_NR; info->addr = 0; info->fault = -1; info->engine = -1; info->runlist = -1; info->reset = -1; info->intr = -1; list_add_tail(&info->head, &top->device); } return info; }

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u32 nvkm_top_reset(struct nvkm_device *device, enum nvkm_devidx index) { struct nvkm_top *top = device->top; struct nvkm_top_device *info; if (top) { list_for_each_entry(info, &top->device, head) { if (info->index == index && info->reset >= 0) return BIT(info->reset); } } return 0; }

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u32 nvkm_top_intr_mask(struct nvkm_device *device, enum nvkm_devidx devidx) { struct nvkm_top *top = device->top; struct nvkm_top_device *info; if (top) { list_for_each_entry(info, &top->device, head) { if (info->index == devidx && info->intr >= 0) return BIT(info->intr); } } return 0; }

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u32 nvkm_top_intr(struct nvkm_device *device, u32 intr, u64 *psubdevs) { struct nvkm_top *top = device->top; struct nvkm_top_device *info; u64 subdevs = 0; u32 handled = 0; if (top) { list_for_each_entry(info, &top->device, head) { if (info->index != NVKM_SUBDEV_NR && info->intr >= 0) { if (intr & BIT(info->intr)) { subdevs |= BIT_ULL(info->index); handled |= BIT(info->intr); } } } } *psubdevs = subdevs; return intr & ~handled; }

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int nvkm_top_fault_id(struct nvkm_device *device, enum nvkm_devidx devidx) { struct nvkm_top *top = device->top; struct nvkm_top_device *info; list_for_each_entry(info, &top->device, head) { if (info->index == devidx && info->fault >= 0) return info->fault; } return -ENOENT; }

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enum nvkm_devidx nvkm_top_fault(struct nvkm_device *device, int fault) { struct nvkm_top *top = device->top; struct nvkm_top_device *info; list_for_each_entry(info, &top->device, head) { if (info->fault == fault) return info->index; } return NVKM_SUBDEV_NR; }

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enum nvkm_devidx nvkm_top_engine(struct nvkm_device *device, int index, int *runl, int *engn) { struct nvkm_top *top = device->top; struct nvkm_top_device *info; int n = 0; list_for_each_entry(info, &top->device, head) { if (info->engine >= 0 && info->runlist >= 0 && n++ == index) { *runl = info->runlist; *engn = info->engine; return info->index; } } return -ENODEV; }

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static int nvkm_top_oneinit(struct nvkm_subdev *subdev) { struct nvkm_top *top = nvkm_top(subdev); return top->func->oneinit(top); }

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static void * nvkm_top_dtor(struct nvkm_subdev *subdev) { struct nvkm_top *top = nvkm_top(subdev); struct nvkm_top_device *info, *temp; list_for_each_entry_safe(info, temp, &top->device, head) { list_del(&info->head); kfree(info); } return top; }

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static const struct nvkm_subdev_func nvkm_top = { .dtor = nvkm_top_dtor, .oneinit = nvkm_top_oneinit, };
int nvkm_top_new_(const struct nvkm_top_func *func, struct nvkm_device *device, int index, struct nvkm_top **ptop) { struct nvkm_top *top; if (!(top = *ptop = kzalloc(sizeof(*top), GFP_KERNEL))) return -ENOMEM; nvkm_subdev_ctor(&nvkm_top, device, index, &top->subdev); top->func = func; INIT_LIST_HEAD(&top->device); return 0; }

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