diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_exec.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_exec.c | 424 |
1 files changed, 424 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_exec.c b/drivers/gpu/drm/nouveau/nouveau_exec.c new file mode 100644 index 000000000000..a90c4cd8cbb2 --- /dev/null +++ b/drivers/gpu/drm/nouveau/nouveau_exec.c @@ -0,0 +1,424 @@ +// SPDX-License-Identifier: MIT + +#include <drm/drm_exec.h> + +#include "nouveau_drv.h" +#include "nouveau_gem.h" +#include "nouveau_mem.h" +#include "nouveau_dma.h" +#include "nouveau_exec.h" +#include "nouveau_abi16.h" +#include "nouveau_chan.h" +#include "nouveau_sched.h" +#include "nouveau_uvmm.h" + +/** + * DOC: Overview + * + * Nouveau's VM_BIND / EXEC UAPI consists of three ioctls: DRM_NOUVEAU_VM_INIT, + * DRM_NOUVEAU_VM_BIND and DRM_NOUVEAU_EXEC. + * + * In order to use the UAPI firstly a user client must initialize the VA space + * using the DRM_NOUVEAU_VM_INIT ioctl specifying which region of the VA space + * should be managed by the kernel and which by the UMD. + * + * The DRM_NOUVEAU_VM_BIND ioctl provides clients an interface to manage the + * userspace-managable portion of the VA space. It provides operations to map + * and unmap memory. Mappings may be flagged as sparse. Sparse mappings are not + * backed by a GEM object and the kernel will ignore GEM handles provided + * alongside a sparse mapping. + * + * Userspace may request memory backed mappings either within or outside of the + * bounds (but not crossing those bounds) of a previously mapped sparse + * mapping. Subsequently requested memory backed mappings within a sparse + * mapping will take precedence over the corresponding range of the sparse + * mapping. If such memory backed mappings are unmapped the kernel will make + * sure that the corresponding sparse mapping will take their place again. + * Requests to unmap a sparse mapping that still contains memory backed mappings + * will result in those memory backed mappings being unmapped first. + * + * Unmap requests are not bound to the range of existing mappings and can even + * overlap the bounds of sparse mappings. For such a request the kernel will + * make sure to unmap all memory backed mappings within the given range, + * splitting up memory backed mappings which are only partially contained + * within the given range. Unmap requests with the sparse flag set must match + * the range of a previously mapped sparse mapping exactly though. + * + * While the kernel generally permits arbitrary sequences and ranges of memory + * backed mappings being mapped and unmapped, either within a single or multiple + * VM_BIND ioctl calls, there are some restrictions for sparse mappings. + * + * The kernel does not permit to: + * - unmap non-existent sparse mappings + * - unmap a sparse mapping and map a new sparse mapping overlapping the range + * of the previously unmapped sparse mapping within the same VM_BIND ioctl + * - unmap a sparse mapping and map new memory backed mappings overlapping the + * range of the previously unmapped sparse mapping within the same VM_BIND + * ioctl + * + * When using the VM_BIND ioctl to request the kernel to map memory to a given + * virtual address in the GPU's VA space there is no guarantee that the actual + * mappings are created in the GPU's MMU. If the given memory is swapped out + * at the time the bind operation is executed the kernel will stash the mapping + * details into it's internal alloctor and create the actual MMU mappings once + * the memory is swapped back in. While this is transparent for userspace, it is + * guaranteed that all the backing memory is swapped back in and all the memory + * mappings, as requested by userspace previously, are actually mapped once the + * DRM_NOUVEAU_EXEC ioctl is called to submit an exec job. + * + * A VM_BIND job can be executed either synchronously or asynchronously. If + * exectued asynchronously, userspace may provide a list of syncobjs this job + * will wait for and/or a list of syncobj the kernel will signal once the + * VM_BIND job finished execution. If executed synchronously the ioctl will + * block until the bind job is finished. For synchronous jobs the kernel will + * not permit any syncobjs submitted to the kernel. + * + * To execute a push buffer the UAPI provides the DRM_NOUVEAU_EXEC ioctl. EXEC + * jobs are always executed asynchronously, and, equal to VM_BIND jobs, provide + * the option to synchronize them with syncobjs. + * + * Besides that, EXEC jobs can be scheduled for a specified channel to execute on. + * + * Since VM_BIND jobs update the GPU's VA space on job submit, EXEC jobs do have + * an up to date view of the VA space. However, the actual mappings might still + * be pending. Hence, EXEC jobs require to have the particular fences - of + * the corresponding VM_BIND jobs they depent on - attached to them. + */ + +static int +nouveau_exec_job_submit(struct nouveau_job *job) +{ + struct nouveau_exec_job *exec_job = to_nouveau_exec_job(job); + struct nouveau_cli *cli = job->cli; + struct nouveau_uvmm *uvmm = nouveau_cli_uvmm(cli); + struct drm_exec *exec = &job->exec; + struct drm_gem_object *obj; + unsigned long index; + int ret; + + ret = nouveau_fence_new(&exec_job->fence); + if (ret) + return ret; + + nouveau_uvmm_lock(uvmm); + drm_exec_init(exec, DRM_EXEC_INTERRUPTIBLE_WAIT | + DRM_EXEC_IGNORE_DUPLICATES); + drm_exec_until_all_locked(exec) { + struct drm_gpuva *va; + + drm_gpuva_for_each_va(va, &uvmm->umgr) { + if (unlikely(va == &uvmm->umgr.kernel_alloc_node)) + continue; + + ret = drm_exec_prepare_obj(exec, va->gem.obj, 1); + drm_exec_retry_on_contention(exec); + if (ret) + goto err_uvmm_unlock; + } + } + nouveau_uvmm_unlock(uvmm); + + drm_exec_for_each_locked_object(exec, index, obj) { + struct nouveau_bo *nvbo = nouveau_gem_object(obj); + + ret = nouveau_bo_validate(nvbo, true, false); + if (ret) + goto err_exec_fini; + } + + return 0; + +err_uvmm_unlock: + nouveau_uvmm_unlock(uvmm); +err_exec_fini: + drm_exec_fini(exec); + return ret; + +} + +static void +nouveau_exec_job_armed_submit(struct nouveau_job *job) +{ + struct drm_exec *exec = &job->exec; + struct drm_gem_object *obj; + unsigned long index; + + drm_exec_for_each_locked_object(exec, index, obj) + dma_resv_add_fence(obj->resv, job->done_fence, job->resv_usage); + + drm_exec_fini(exec); +} + +static struct dma_fence * +nouveau_exec_job_run(struct nouveau_job *job) +{ + struct nouveau_exec_job *exec_job = to_nouveau_exec_job(job); + struct nouveau_channel *chan = exec_job->chan; + struct nouveau_fence *fence = exec_job->fence; + int i, ret; + + ret = nouveau_dma_wait(chan, exec_job->push.count + 1, 16); + if (ret) { + NV_PRINTK(err, job->cli, "nv50cal_space: %d\n", ret); + return ERR_PTR(ret); + } + + for (i = 0; i < exec_job->push.count; i++) { + struct drm_nouveau_exec_push *p = &exec_job->push.s[i]; + bool no_prefetch = p->flags & DRM_NOUVEAU_EXEC_PUSH_NO_PREFETCH; + + nv50_dma_push(chan, p->va, p->va_len, no_prefetch); + } + + ret = nouveau_fence_emit(fence, chan); + if (ret) { + NV_PRINTK(err, job->cli, "error fencing pushbuf: %d\n", ret); + WIND_RING(chan); + return ERR_PTR(ret); + } + + exec_job->fence = NULL; + + return &fence->base; +} + +static void +nouveau_exec_job_free(struct nouveau_job *job) +{ + struct nouveau_exec_job *exec_job = to_nouveau_exec_job(job); + + nouveau_job_free(job); + + nouveau_fence_unref(&exec_job->fence); + kfree(exec_job->push.s); + kfree(exec_job); +} + +static enum drm_gpu_sched_stat +nouveau_exec_job_timeout(struct nouveau_job *job) +{ + struct nouveau_exec_job *exec_job = to_nouveau_exec_job(job); + struct nouveau_channel *chan = exec_job->chan; + + if (unlikely(!atomic_read(&chan->killed))) + nouveau_channel_kill(chan); + + NV_PRINTK(warn, job->cli, "job timeout, channel %d killed!\n", + chan->chid); + + nouveau_sched_entity_fini(job->entity); + + return DRM_GPU_SCHED_STAT_ENODEV; +} + +static struct nouveau_job_ops nouveau_exec_job_ops = { + .submit = nouveau_exec_job_submit, + .armed_submit = nouveau_exec_job_armed_submit, + .run = nouveau_exec_job_run, + .free = nouveau_exec_job_free, + .timeout = nouveau_exec_job_timeout, +}; + +int +nouveau_exec_job_init(struct nouveau_exec_job **pjob, + struct nouveau_exec_job_args *__args) +{ + struct nouveau_exec_job *job; + struct nouveau_job_args args = {}; + int i, ret; + + for (i = 0; i < __args->push.count; i++) { + struct drm_nouveau_exec_push *p = &__args->push.s[i]; + + if (unlikely(p->va_len > NV50_DMA_PUSH_MAX_LENGTH)) { + NV_PRINTK(err, nouveau_cli(__args->file_priv), + "pushbuf size exceeds limit: 0x%x max 0x%x\n", + p->va_len, NV50_DMA_PUSH_MAX_LENGTH); + return -EINVAL; + } + } + + job = *pjob = kzalloc(sizeof(*job), GFP_KERNEL); + if (!job) + return -ENOMEM; + + job->push.count = __args->push.count; + if (__args->push.count) { + job->push.s = kmemdup(__args->push.s, + sizeof(*__args->push.s) * + __args->push.count, + GFP_KERNEL); + if (!job->push.s) { + ret = -ENOMEM; + goto err_free_job; + } + } + + job->chan = __args->chan; + + args.sched_entity = __args->sched_entity; + args.file_priv = __args->file_priv; + + args.in_sync.count = __args->in_sync.count; + args.in_sync.s = __args->in_sync.s; + + args.out_sync.count = __args->out_sync.count; + args.out_sync.s = __args->out_sync.s; + + args.ops = &nouveau_exec_job_ops; + args.resv_usage = DMA_RESV_USAGE_WRITE; + + ret = nouveau_job_init(&job->base, &args); + if (ret) + goto err_free_pushs; + + return 0; + +err_free_pushs: + kfree(job->push.s); +err_free_job: + kfree(job); + *pjob = NULL; + + return ret; +} + +static int +nouveau_exec(struct nouveau_exec_job_args *args) +{ + struct nouveau_exec_job *job; + int ret; + + ret = nouveau_exec_job_init(&job, args); + if (ret) + return ret; + + ret = nouveau_job_submit(&job->base); + if (ret) + goto err_job_fini; + + return 0; + +err_job_fini: + nouveau_job_fini(&job->base); + return ret; +} + +static int +nouveau_exec_ucopy(struct nouveau_exec_job_args *args, + struct drm_nouveau_exec *req) +{ + struct drm_nouveau_sync **s; + u32 inc = req->wait_count; + u64 ins = req->wait_ptr; + u32 outc = req->sig_count; + u64 outs = req->sig_ptr; + u32 pushc = req->push_count; + u64 pushs = req->push_ptr; + int ret; + + if (pushc) { + args->push.count = pushc; + args->push.s = u_memcpya(pushs, pushc, sizeof(*args->push.s)); + if (IS_ERR(args->push.s)) + return PTR_ERR(args->push.s); + } + + if (inc) { + s = &args->in_sync.s; + + args->in_sync.count = inc; + *s = u_memcpya(ins, inc, sizeof(**s)); + if (IS_ERR(*s)) { + ret = PTR_ERR(*s); + goto err_free_pushs; + } + } + + if (outc) { + s = &args->out_sync.s; + + args->out_sync.count = outc; + *s = u_memcpya(outs, outc, sizeof(**s)); + if (IS_ERR(*s)) { + ret = PTR_ERR(*s); + goto err_free_ins; + } + } + + return 0; + +err_free_pushs: + u_free(args->push.s); +err_free_ins: + u_free(args->in_sync.s); + return ret; +} + +static void +nouveau_exec_ufree(struct nouveau_exec_job_args *args) +{ + u_free(args->push.s); + u_free(args->in_sync.s); + u_free(args->out_sync.s); +} + +int +nouveau_exec_ioctl_exec(struct drm_device *dev, + void *data, + struct drm_file *file_priv) +{ + struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv); + struct nouveau_cli *cli = nouveau_cli(file_priv); + struct nouveau_abi16_chan *chan16; + struct nouveau_channel *chan = NULL; + struct nouveau_exec_job_args args = {}; + struct drm_nouveau_exec *req = data; + int ret = 0; + + if (unlikely(!abi16)) + return -ENOMEM; + + /* abi16 locks already */ + if (unlikely(!nouveau_cli_uvmm(cli))) + return nouveau_abi16_put(abi16, -ENOSYS); + + list_for_each_entry(chan16, &abi16->channels, head) { + if (chan16->chan->chid == req->channel) { + chan = chan16->chan; + break; + } + } + + if (!chan) + return nouveau_abi16_put(abi16, -ENOENT); + + if (unlikely(atomic_read(&chan->killed))) + return nouveau_abi16_put(abi16, -ENODEV); + + if (!chan->dma.ib_max) + return nouveau_abi16_put(abi16, -ENOSYS); + + if (unlikely(req->push_count > NOUVEAU_GEM_MAX_PUSH)) { + NV_PRINTK(err, cli, "pushbuf push count exceeds limit: %d max %d\n", + req->push_count, NOUVEAU_GEM_MAX_PUSH); + return nouveau_abi16_put(abi16, -EINVAL); + } + + ret = nouveau_exec_ucopy(&args, req); + if (ret) + goto out; + + args.sched_entity = &chan16->sched_entity; + args.file_priv = file_priv; + args.chan = chan; + + ret = nouveau_exec(&args); + if (ret) + goto out_free_args; + +out_free_args: + nouveau_exec_ufree(&args); +out: + return nouveau_abi16_put(abi16, ret); +} |