259 lines
6.7 KiB
C
259 lines
6.7 KiB
C
/* $OpenBSD: drm_gem_dma_helper.c,v 1.1 2023/01/01 01:34:34 jsg Exp $ */
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/* $NetBSD: drm_gem_dma_helper.c,v 1.9 2019/11/05 23:29:28 jmcneill Exp $ */
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/*-
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* Copyright (c) 2015-2017 Jared McNeill <jmcneill@invisible.ca>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <linux/iosys-map.h>
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#include <drm/drm_device.h>
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#include <drm/drm_gem_dma_helper.h>
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#include <uvm/uvm.h>
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static const struct drm_gem_object_funcs drm_gem_dma_default_funcs = {
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.free = drm_gem_dma_free_object,
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.get_sg_table = drm_gem_dma_get_sg_table,
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.vmap = drm_gem_dma_vmap,
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// .mmap = drm_gem_dma_mmap,
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};
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static struct drm_gem_dma_object *
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drm_gem_dma_create_internal(struct drm_device *ddev, size_t size,
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struct sg_table *sgt)
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{
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struct drm_gem_dma_object *obj;
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int error, nsegs;
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obj = malloc(sizeof(*obj), M_DRM, M_WAITOK | M_ZERO);
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obj->dmat = ddev->dmat;
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obj->dmasize = size;
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obj->base.funcs = &drm_gem_dma_default_funcs;
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if (sgt) {
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#ifdef notyet
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error = -drm_prime_sg_to_bus_dmamem(obj->dmat, obj->dmasegs, 1,
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&nsegs, sgt);
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#endif
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error = -ENOMEM;
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} else {
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error = bus_dmamem_alloc(obj->dmat, obj->dmasize,
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PAGE_SIZE, 0, obj->dmasegs, 1, &nsegs,
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BUS_DMA_WAITOK);
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}
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if (error)
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goto failed;
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error = bus_dmamem_map(obj->dmat, obj->dmasegs, nsegs,
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obj->dmasize, &obj->vaddr,
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BUS_DMA_WAITOK | BUS_DMA_NOCACHE);
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if (error)
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goto free;
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error = bus_dmamap_create(obj->dmat, obj->dmasize, 1,
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obj->dmasize, 0, BUS_DMA_WAITOK, &obj->dmamap);
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if (error)
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goto unmap;
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error = bus_dmamap_load(obj->dmat, obj->dmamap, obj->vaddr,
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obj->dmasize, NULL, BUS_DMA_WAITOK);
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if (error)
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goto destroy;
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#ifdef notyet
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if (!sgt)
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#endif
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memset(obj->vaddr, 0, obj->dmasize);
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error = drm_gem_object_init(ddev, &obj->base, size);
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if (error)
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goto unload;
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return obj;
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unload:
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bus_dmamap_unload(obj->dmat, obj->dmamap);
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destroy:
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bus_dmamap_destroy(obj->dmat, obj->dmamap);
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unmap:
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bus_dmamem_unmap(obj->dmat, obj->vaddr, obj->dmasize);
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free:
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#ifdef notyet
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if (obj->sgt)
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drm_prime_sg_free(obj->sgt);
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else
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#endif
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bus_dmamem_free(obj->dmat, obj->dmasegs, nsegs);
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failed:
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free(obj, M_DRM, sizeof(*obj));
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return NULL;
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}
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struct drm_gem_dma_object *
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drm_gem_dma_create(struct drm_device *ddev, size_t size)
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{
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return drm_gem_dma_create_internal(ddev, size, NULL);
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}
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static void
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drm_gem_dma_obj_free(struct drm_gem_dma_object *obj)
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{
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bus_dmamap_unload(obj->dmat, obj->dmamap);
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bus_dmamap_destroy(obj->dmat, obj->dmamap);
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bus_dmamem_unmap(obj->dmat, obj->vaddr, obj->dmasize);
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#ifdef notyet
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if (obj->sgt)
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drm_prime_sg_free(obj->sgt);
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else
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#endif
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bus_dmamem_free(obj->dmat, obj->dmasegs, 1);
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free(obj, M_DRM, sizeof(*obj));
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}
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void
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drm_gem_dma_free_object(struct drm_gem_object *gem_obj)
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{
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struct drm_gem_dma_object *obj = to_drm_gem_dma_obj(gem_obj);
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drm_gem_free_mmap_offset(gem_obj);
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drm_gem_object_release(gem_obj);
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drm_gem_dma_obj_free(obj);
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}
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int
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drm_gem_dma_dumb_create(struct drm_file *file_priv, struct drm_device *ddev,
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struct drm_mode_create_dumb *args)
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{
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struct drm_gem_dma_object *obj;
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uint32_t handle;
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int error;
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args->pitch = args->width * ((args->bpp + 7) / 8);
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args->size = args->pitch * args->height;
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args->size = roundup(args->size, PAGE_SIZE);
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args->handle = 0;
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obj = drm_gem_dma_create(ddev, args->size);
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if (obj == NULL)
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return -ENOMEM;
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error = drm_gem_handle_create(file_priv, &obj->base, &handle);
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drm_gem_object_put(&obj->base);
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if (error) {
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drm_gem_dma_obj_free(obj);
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return error;
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}
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args->handle = handle;
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return 0;
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}
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int
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drm_gem_dma_fault(struct drm_gem_object *gem_obj, struct uvm_faultinfo *ufi,
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off_t offset, vaddr_t vaddr, vm_page_t *pps, int npages, int centeridx,
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vm_prot_t access_type, int flags)
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{
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struct vm_map_entry *entry = ufi->entry;
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struct drm_gem_dma_object *obj = to_drm_gem_dma_obj(gem_obj);
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struct uvm_object *uobj = &obj->base.uobj;
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paddr_t paddr;
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int lcv, retval;
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vm_prot_t mapprot;
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offset -= drm_vma_node_offset_addr(&obj->base.vma_node);
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mapprot = ufi->entry->protection;
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retval = 0;
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for (lcv = 0; lcv < npages; lcv++, offset += PAGE_SIZE,
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vaddr += PAGE_SIZE) {
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if ((flags & PGO_ALLPAGES) == 0 && lcv != centeridx)
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continue;
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if (pps[lcv] == PGO_DONTCARE)
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continue;
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paddr = bus_dmamem_mmap(obj->dmat, obj->dmasegs, 1,
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offset, access_type, BUS_DMA_NOCACHE);
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if (paddr == -1) {
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retval = VM_PAGER_BAD;
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break;
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}
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if (pmap_enter(ufi->orig_map->pmap, vaddr, paddr,
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mapprot, PMAP_CANFAIL | mapprot) != 0) {
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pmap_update(ufi->orig_map->pmap);
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uvmfault_unlockall(ufi, ufi->entry->aref.ar_amap,
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uobj);
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uvm_wait("drm_gem_dma_fault");
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return VM_PAGER_REFAULT;
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}
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}
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pmap_update(ufi->orig_map->pmap);
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uvmfault_unlockall(ufi, ufi->entry->aref.ar_amap, uobj);
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return retval;
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}
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struct sg_table *
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drm_gem_dma_get_sg_table(struct drm_gem_object *gem_obj)
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{
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struct drm_gem_dma_object *obj = to_drm_gem_dma_obj(gem_obj);
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return NULL;
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#ifdef notyet
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return drm_prime_bus_dmamem_to_sg(obj->dmat, obj->dmasegs, 1);
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#endif
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}
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struct drm_gem_object *
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drm_gem_dma_prime_import_sg_table(struct drm_device *ddev,
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struct dma_buf_attachment *attach, struct sg_table *sgt)
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{
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return NULL;
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#ifdef notyet
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size_t size = drm_prime_sg_size(sgt);
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struct drm_gem_dma_object *obj;
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obj = drm_gem_dma_create_internal(ddev, size, sgt);
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if (obj == NULL)
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return ERR_PTR(-ENOMEM);
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return &obj->base;
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#endif
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}
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int
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drm_gem_dma_vmap(struct drm_gem_object *gem_obj, struct iosys_map *map)
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{
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struct drm_gem_dma_object *obj = to_drm_gem_dma_obj(gem_obj);
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iosys_map_set_vaddr(map, obj->vaddr);
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return 0;
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}
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