/* $NetBSD: drm_gem_cma_helper.c,v 1.14.4.1 2024/10/04 11:40:51 martin Exp $ */ /*- * Copyright (c) 2015-2017 Jared McNeill * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __KERNEL_RCSID(0, "$NetBSD: drm_gem_cma_helper.c,v 1.14.4.1 2024/10/04 11:40:51 martin Exp $"); #include #include #include #include #include #include #include static struct drm_gem_cma_object * drm_gem_cma_create_internal(struct drm_device *ddev, size_t size, struct sg_table *sgt) { struct drm_gem_cma_object *obj; int error = EINVAL, nsegs; obj = kmem_zalloc(sizeof(*obj), KM_SLEEP); obj->dmat = ddev->dmat; obj->dmasize = size; if (sgt) { error = -drm_prime_sg_to_bus_dmamem(obj->dmat, obj->dmasegs, 1, &nsegs, sgt); } else { if (ddev->cma_pool != NULL) { error = vmem_xalloc(ddev->cma_pool, obj->dmasize, PAGE_SIZE, 0, 0, VMEM_ADDR_MIN, VMEM_ADDR_MAX, VM_BESTFIT | VM_NOSLEEP, &obj->vmem_addr); if (!error) { obj->vmem_pool = ddev->cma_pool; obj->dmasegs[0].ds_addr = PHYS_TO_BUS_MEM(obj->dmat, obj->vmem_addr); obj->dmasegs[0].ds_len = roundup(obj->dmasize, PAGE_SIZE); nsegs = 1; } } if (obj->vmem_pool == NULL) { error = bus_dmamem_alloc(obj->dmat, obj->dmasize, PAGE_SIZE, 0, obj->dmasegs, 1, &nsegs, BUS_DMA_WAITOK); } } if (error) goto failed; error = bus_dmamem_map(obj->dmat, obj->dmasegs, nsegs, obj->dmasize, &obj->vaddr, BUS_DMA_WAITOK | BUS_DMA_PREFETCHABLE); if (error) goto free; error = bus_dmamap_create(obj->dmat, obj->dmasize, 1, obj->dmasize, 0, BUS_DMA_WAITOK, &obj->dmamap); if (error) goto unmap; error = bus_dmamap_load(obj->dmat, obj->dmamap, obj->vaddr, obj->dmasize, NULL, BUS_DMA_WAITOK); if (error) goto destroy; if (!sgt) memset(obj->vaddr, 0, obj->dmasize); drm_gem_private_object_init(ddev, &obj->base, size); return obj; destroy: bus_dmamap_destroy(obj->dmat, obj->dmamap); unmap: bus_dmamem_unmap(obj->dmat, obj->vaddr, obj->dmasize); free: if (obj->sgt) drm_prime_sg_free(obj->sgt); else if (obj->vmem_pool) vmem_xfree(obj->vmem_pool, obj->vmem_addr, obj->dmasize); else bus_dmamem_free(obj->dmat, obj->dmasegs, nsegs); failed: kmem_free(obj, sizeof(*obj)); return NULL; } struct drm_gem_cma_object * drm_gem_cma_create(struct drm_device *ddev, size_t size) { return drm_gem_cma_create_internal(ddev, size, NULL); } static void drm_gem_cma_obj_free(struct drm_gem_cma_object *obj) { bus_dmamap_unload(obj->dmat, obj->dmamap); bus_dmamap_destroy(obj->dmat, obj->dmamap); bus_dmamem_unmap(obj->dmat, obj->vaddr, obj->dmasize); if (obj->sgt) drm_prime_sg_free(obj->sgt); else if (obj->vmem_pool) vmem_xfree(obj->vmem_pool, obj->vmem_addr, obj->dmasize); else bus_dmamem_free(obj->dmat, obj->dmasegs, 1); kmem_free(obj, sizeof(*obj)); } void drm_gem_cma_free_object(struct drm_gem_object *gem_obj) { struct drm_gem_cma_object *obj = to_drm_gem_cma_obj(gem_obj); drm_gem_free_mmap_offset(gem_obj); drm_gem_object_release(gem_obj); drm_gem_cma_obj_free(obj); } int drm_gem_cma_dumb_create(struct drm_file *file_priv, struct drm_device *ddev, struct drm_mode_create_dumb *args) { struct drm_gem_cma_object *obj; uint32_t handle; int error; args->pitch = args->width * ((args->bpp + 7) / 8); args->size = args->pitch * args->height; args->size = roundup(args->size, PAGE_SIZE); args->handle = 0; obj = drm_gem_cma_create(ddev, args->size); if (obj == NULL) return -ENOMEM; error = drm_gem_handle_create(file_priv, &obj->base, &handle); drm_gem_object_put_unlocked(&obj->base); if (error) { drm_gem_cma_obj_free(obj); return error; } args->handle = handle; return 0; } static int drm_gem_cma_fault(struct uvm_faultinfo *ufi, vaddr_t vaddr, struct vm_page **pps, int npages, int centeridx, vm_prot_t access_type, int flags) { struct vm_map_entry *entry = ufi->entry; struct uvm_object *uobj = entry->object.uvm_obj; struct drm_gem_object *gem_obj = container_of(uobj, struct drm_gem_object, gemo_uvmobj); struct drm_gem_cma_object *obj = to_drm_gem_cma_obj(gem_obj); off_t curr_offset; vaddr_t curr_va; paddr_t paddr, mdpgno; u_int mmapflags; int lcv, retval; vm_prot_t mapprot; if (UVM_ET_ISCOPYONWRITE(entry)) return EIO; curr_offset = entry->offset + (vaddr - entry->start); curr_va = vaddr; retval = 0; for (lcv = 0; lcv < npages; lcv++, curr_offset += PAGE_SIZE, curr_va += PAGE_SIZE) { if ((flags & PGO_ALLPAGES) == 0 && lcv != centeridx) continue; if (pps[lcv] == PGO_DONTCARE) continue; mdpgno = bus_dmamem_mmap(obj->dmat, obj->dmasegs, 1, curr_offset, access_type, BUS_DMA_PREFETCHABLE); if (mdpgno == -1) { retval = EIO; break; } paddr = pmap_phys_address(mdpgno); mmapflags = pmap_mmap_flags(mdpgno); mapprot = ufi->entry->protection; if (pmap_enter(ufi->orig_map->pmap, curr_va, paddr, mapprot, PMAP_CANFAIL | mapprot | mmapflags) != 0) { pmap_update(ufi->orig_map->pmap); uvmfault_unlockall(ufi, ufi->entry->aref.ar_amap, uobj); return ENOMEM; } } pmap_update(ufi->orig_map->pmap); uvmfault_unlockall(ufi, ufi->entry->aref.ar_amap, uobj); return retval; } const struct uvm_pagerops drm_gem_cma_uvm_ops = { .pgo_reference = drm_gem_pager_reference, .pgo_detach = drm_gem_pager_detach, .pgo_fault = drm_gem_cma_fault, }; struct sg_table * drm_gem_cma_prime_get_sg_table(struct drm_gem_object *gem_obj) { struct drm_gem_cma_object *obj = to_drm_gem_cma_obj(gem_obj); return drm_prime_bus_dmamem_to_sg(obj->dmat, obj->dmasegs, 1); } struct drm_gem_object * drm_gem_cma_prime_import_sg_table(struct drm_device *ddev, struct dma_buf_attachment *attach, struct sg_table *sgt) { size_t size = drm_prime_sg_size(sgt); struct drm_gem_cma_object *obj; obj = drm_gem_cma_create_internal(ddev, size, sgt); if (obj == NULL) return ERR_PTR(-ENOMEM); return &obj->base; } void * drm_gem_cma_prime_vmap(struct drm_gem_object *gem_obj) { struct drm_gem_cma_object *obj = to_drm_gem_cma_obj(gem_obj); return obj->vaddr; } void drm_gem_cma_prime_vunmap(struct drm_gem_object *gem_obj, void *vaddr) { struct drm_gem_cma_object *obj __diagused = to_drm_gem_cma_obj(gem_obj); KASSERT(vaddr == obj->vaddr); }