cregit-Linux how code gets into the kernel

Release 4.11 drivers/gpu/drm/nouveau/nvkm/subdev/instmem/base.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.
 *
 * Authors: Ben Skeggs
 */
#include "priv.h"

#include <core/memory.h>
#include <subdev/bar.h>

/******************************************************************************
 * instmem object base implementation
 *****************************************************************************/

#define nvkm_instobj(p) container_of((p), struct nvkm_instobj, memory)


struct nvkm_instobj {
	
struct nvkm_memory memory;
	
struct nvkm_memory *parent;
	
struct nvkm_instmem *imem;
	
struct list_head head;
	
u32 *suspend;
	
void __iomem *map;
};


static enum nvkm_memory_target nvkm_instobj_target(struct nvkm_memory *memory) { memory = nvkm_instobj(memory)->parent; return nvkm_memory_target(memory); }

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static u64 nvkm_instobj_addr(struct nvkm_memory *memory) { memory = nvkm_instobj(memory)->parent; return nvkm_memory_addr(memory); }

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static u64 nvkm_instobj_size(struct nvkm_memory *memory) { memory = nvkm_instobj(memory)->parent; return nvkm_memory_size(memory); }

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static void nvkm_instobj_release(struct nvkm_memory *memory) { struct nvkm_instobj *iobj = nvkm_instobj(memory); nvkm_bar_flush(iobj->imem->subdev.device->bar); }

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static void __iomem * nvkm_instobj_acquire(struct nvkm_memory *memory) { return nvkm_instobj(memory)->map; }

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static u32 nvkm_instobj_rd32(struct nvkm_memory *memory, u64 offset) { return ioread32_native(nvkm_instobj(memory)->map + offset); }

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static void nvkm_instobj_wr32(struct nvkm_memory *memory, u64 offset, u32 data) { iowrite32_native(data, nvkm_instobj(memory)->map + offset); }

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static void nvkm_instobj_map(struct nvkm_memory *memory, struct nvkm_vma *vma, u64 offset) { memory = nvkm_instobj(memory)->parent; nvkm_memory_map(memory, vma, offset); }

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static void * nvkm_instobj_dtor(struct nvkm_memory *memory) { struct nvkm_instobj *iobj = nvkm_instobj(memory); spin_lock(&iobj->imem->lock); list_del(&iobj->head); spin_unlock(&iobj->imem->lock); nvkm_memory_del(&iobj->parent); return iobj; }

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static const struct nvkm_memory_func nvkm_instobj_func = { .dtor = nvkm_instobj_dtor, .target = nvkm_instobj_target, .addr = nvkm_instobj_addr, .size = nvkm_instobj_size, .acquire = nvkm_instobj_acquire, .release = nvkm_instobj_release, .rd32 = nvkm_instobj_rd32, .wr32 = nvkm_instobj_wr32, .map = nvkm_instobj_map, };
static void nvkm_instobj_boot(struct nvkm_memory *memory, struct nvkm_vm *vm) { memory = nvkm_instobj(memory)->parent; nvkm_memory_boot(memory, vm); }

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static void nvkm_instobj_release_slow(struct nvkm_memory *memory) { struct nvkm_instobj *iobj = nvkm_instobj(memory); nvkm_instobj_release(memory); nvkm_done(iobj->parent); }

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static void __iomem * nvkm_instobj_acquire_slow(struct nvkm_memory *memory) { struct nvkm_instobj *iobj = nvkm_instobj(memory); iobj->map = nvkm_kmap(iobj->parent); if (iobj->map) memory->func = &nvkm_instobj_func; return iobj->map; }

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static u32 nvkm_instobj_rd32_slow(struct nvkm_memory *memory, u64 offset) { struct nvkm_instobj *iobj = nvkm_instobj(memory); return nvkm_ro32(iobj->parent, offset); }

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static void nvkm_instobj_wr32_slow(struct nvkm_memory *memory, u64 offset, u32 data) { struct nvkm_instobj *iobj = nvkm_instobj(memory); return nvkm_wo32(iobj->parent, offset, data); }

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static const struct nvkm_memory_func nvkm_instobj_func_slow = { .dtor = nvkm_instobj_dtor, .target = nvkm_instobj_target, .addr = nvkm_instobj_addr, .size = nvkm_instobj_size, .boot = nvkm_instobj_boot, .acquire = nvkm_instobj_acquire_slow, .release = nvkm_instobj_release_slow, .rd32 = nvkm_instobj_rd32_slow, .wr32 = nvkm_instobj_wr32_slow, .map = nvkm_instobj_map, };
int nvkm_instobj_new(struct nvkm_instmem *imem, u32 size, u32 align, bool zero, struct nvkm_memory **pmemory) { struct nvkm_memory *memory = NULL; struct nvkm_instobj *iobj; u32 offset; int ret; ret = imem->func->memory_new(imem, size, align, zero, &memory); if (ret) goto done; if (!imem->func->persistent) { if (!(iobj = kzalloc(sizeof(*iobj), GFP_KERNEL))) { ret = -ENOMEM; goto done; } nvkm_memory_ctor(&nvkm_instobj_func_slow, &iobj->memory); iobj->parent = memory; iobj->imem = imem; spin_lock(&iobj->imem->lock); list_add_tail(&iobj->head, &imem->list); spin_unlock(&iobj->imem->lock); memory = &iobj->memory; } if (!imem->func->zero && zero) { void __iomem *map = nvkm_kmap(memory); if (unlikely(!map)) { for (offset = 0; offset < size; offset += 4) nvkm_wo32(memory, offset, 0x00000000); } else { memset_io(map, 0x00, size); } nvkm_done(memory); } done: if (ret) nvkm_memory_del(&memory); *pmemory = memory; return ret; }

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/****************************************************************************** * instmem subdev base implementation *****************************************************************************/
u32 nvkm_instmem_rd32(struct nvkm_instmem *imem, u32 addr) { return imem->func->rd32(imem, addr); }

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void nvkm_instmem_wr32(struct nvkm_instmem *imem, u32 addr, u32 data) { return imem->func->wr32(imem, addr, data); }

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static int nvkm_instmem_fini(struct nvkm_subdev *subdev, bool suspend) { struct nvkm_instmem *imem = nvkm_instmem(subdev); struct nvkm_instobj *iobj; int i; if (imem->func->fini) imem->func->fini(imem); if (suspend) { list_for_each_entry(iobj, &imem->list, head) { struct nvkm_memory *memory = iobj->parent; u64 size = nvkm_memory_size(memory); iobj->suspend = vmalloc(size); if (!iobj->suspend) return -ENOMEM; for (i = 0; i < size; i += 4) iobj->suspend[i / 4] = nvkm_ro32(memory, i); } } return 0; }

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static int nvkm_instmem_oneinit(struct nvkm_subdev *subdev) { struct nvkm_instmem *imem = nvkm_instmem(subdev); if (imem->func->oneinit) return imem->func->oneinit(imem); return 0; }

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static int nvkm_instmem_init(struct nvkm_subdev *subdev) { struct nvkm_instmem *imem = nvkm_instmem(subdev); struct nvkm_instobj *iobj; int i; list_for_each_entry(iobj, &imem->list, head) { if (iobj->suspend) { struct nvkm_memory *memory = iobj->parent; u64 size = nvkm_memory_size(memory); for (i = 0; i < size; i += 4) nvkm_wo32(memory, i, iobj->suspend[i / 4]); vfree(iobj->suspend); iobj->suspend = NULL; } } return 0; }

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static void * nvkm_instmem_dtor(struct nvkm_subdev *subdev) { struct nvkm_instmem *imem = nvkm_instmem(subdev); if (imem->func->dtor) return imem->func->dtor(imem); return imem; }

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static const struct nvkm_subdev_func nvkm_instmem = { .dtor = nvkm_instmem_dtor, .oneinit = nvkm_instmem_oneinit, .init = nvkm_instmem_init, .fini = nvkm_instmem_fini, };
void nvkm_instmem_ctor(const struct nvkm_instmem_func *func, struct nvkm_device *device, int index, struct nvkm_instmem *imem) { nvkm_subdev_ctor(&nvkm_instmem, device, index, &imem->subdev); imem->func = func; spin_lock_init(&imem->lock); INIT_LIST_HEAD(&imem->list); }

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