drivers/gpu/drm/msm/msm_gem_submit.c

root/drivers/gpu/drm/msm/msm_gem_submit.c
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2013 Red Hat
 * Author: Rob Clark <robdclark@gmail.com>
 */

#include <linux/dma-fence-unwrap.h>
#include <linux/file.h>
#include <linux/sync_file.h>
#include <linux/uaccess.h>

#include <drm/drm_drv.h>
#include <drm/drm_file.h>
#include <drm/drm_syncobj.h>

#include "msm_drv.h"
#include "msm_gpu.h"
#include "msm_gem.h"
#include "msm_gpu_trace.h"
#include "msm_syncobj.h"

/* For userspace errors, use DRM_UT_DRIVER.. so that userspace can enable
 * error msgs for debugging, but we don't spam dmesg by default
 */
#define SUBMIT_ERROR(err, submit, fmt, ...) \
        UERR(err, (submit)->dev, fmt, ##__VA_ARGS__)

/*
 * Cmdstream submission:
 */

static struct msm_gem_submit *submit_create(struct drm_device *dev,
                struct msm_gpu *gpu,
                struct msm_gpu_submitqueue *queue, uint32_t nr_bos,
                uint32_t nr_cmds, u64 drm_client_id)
{
        static atomic_t ident = ATOMIC_INIT(0);
        struct msm_gem_submit *submit;
        uint64_t sz;
        int ret;

        sz = struct_size(submit, bos, nr_bos) +
                        ((u64)nr_cmds * sizeof(submit->cmd[0]));

        if (sz > SIZE_MAX)
                return ERR_PTR(-ENOMEM);

        submit = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN);
        if (!submit)
                return ERR_PTR(-ENOMEM);

        submit->hw_fence = msm_fence_alloc();
        if (IS_ERR(submit->hw_fence)) {
                ret = PTR_ERR(submit->hw_fence);
                kfree(submit);
                return ERR_PTR(ret);
        }

        ret = drm_sched_job_init(&submit->base, queue->entity, 1, queue,
                                 drm_client_id);
        if (ret) {
                kfree(submit->hw_fence);
                kfree(submit);
                return ERR_PTR(ret);
        }

        kref_init(&submit->ref);
        submit->dev = dev;
        submit->vm = msm_context_vm(dev, queue->ctx);
        submit->gpu = gpu;
        submit->cmd = (void *)&submit->bos[nr_bos];
        submit->queue = queue;
        submit->pid = get_pid(task_pid(current));
        submit->ring = gpu->rb[queue->ring_nr];
        submit->fault_dumped = false;

        /* Get a unique identifier for the submission for logging purposes */
        submit->ident = atomic_inc_return(&ident) - 1;

        INIT_LIST_HEAD(&submit->node);

        return submit;
}

void __msm_gem_submit_destroy(struct kref *kref)
{
        struct msm_gem_submit *submit =
                        container_of(kref, struct msm_gem_submit, ref);
        unsigned i;

        /*
         * In error paths, we could unref the submit without calling
         * drm_sched_entity_push_job(), so msm_job_free() will never
         * get called.  Since drm_sched_job_cleanup() will NULL out
         * s_fence, we can use that to detect this case.
         */
        if (submit->base.s_fence)
                drm_sched_job_cleanup(&submit->base);

        if (submit->fence_id) {
                spin_lock(&submit->queue->idr_lock);
                idr_remove(&submit->queue->fence_idr, submit->fence_id);
                spin_unlock(&submit->queue->idr_lock);
        }

        dma_fence_put(submit->user_fence);

        /*
         * If the submit is freed before msm_job_run(), then hw_fence is
         * just some pre-allocated memory, not a reference counted fence.
         * Once the job runs and the hw_fence is initialized, it will
         * have a refcount of at least one, since the submit holds a ref
         * to the hw_fence.
         */
        if (kref_read(&submit->hw_fence->refcount) == 0) {
                kfree(submit->hw_fence);
        } else {
                dma_fence_put(submit->hw_fence);
        }

        put_pid(submit->pid);
        msm_submitqueue_put(submit->queue);

        for (i = 0; i < submit->nr_cmds; i++)
                kfree(submit->cmd[i].relocs);

        kfree(submit);
}

static int submit_lookup_objects(struct msm_gem_submit *submit,
                struct drm_msm_gem_submit *args, struct drm_file *file)
{
        unsigned i;
        int ret = 0;

        for (i = 0; i < args->nr_bos; i++) {
                struct drm_msm_gem_submit_bo submit_bo;
                void __user *userptr =
                        u64_to_user_ptr(args->bos + (i * sizeof(submit_bo)));

                /* make sure we don't have garbage flags, in case we hit
                 * error path before flags is initialized:
                 */
                submit->bos[i].flags = 0;

                if (copy_from_user(&submit_bo, userptr, sizeof(submit_bo))) {
                        ret = -EFAULT;
                        i = 0;
                        goto out;
                }

/* at least one of READ and/or WRITE flags should be set: */
#define MANDATORY_FLAGS (MSM_SUBMIT_BO_READ | MSM_SUBMIT_BO_WRITE)

                if ((submit_bo.flags & ~MSM_SUBMIT_BO_FLAGS) ||
                        !(submit_bo.flags & MANDATORY_FLAGS)) {
                        ret = SUBMIT_ERROR(EINVAL, submit, "invalid flags: %x\n", submit_bo.flags);
                        i = 0;
                        goto out;
                }

                submit->bos[i].handle = submit_bo.handle;
                submit->bos[i].flags = submit_bo.flags;
        }

        spin_lock(&file->table_lock);

        for (i = 0; i < args->nr_bos; i++) {
                struct drm_gem_object *obj;

                /* normally use drm_gem_object_lookup(), but for bulk lookup
                 * all under single table_lock just hit object_idr directly:
                 */
                obj = idr_find(&file->object_idr, submit->bos[i].handle);
                if (!obj) {
                        ret = SUBMIT_ERROR(EINVAL, submit, "invalid handle %u at index %u\n", submit->bos[i].handle, i);
                        goto out_unlock;
                }

                drm_gem_object_get(obj);

                submit->bos[i].obj = obj;
        }

out_unlock:
        spin_unlock(&file->table_lock);

out:
        submit->nr_bos = i;

        return ret;
}

static int submit_lookup_cmds(struct msm_gem_submit *submit,
                struct drm_msm_gem_submit *args, struct drm_file *file)
{
        struct msm_context *ctx = file->driver_priv;
        unsigned i;
        size_t sz;
        int ret = 0;

        for (i = 0; i < args->nr_cmds; i++) {
                struct drm_msm_gem_submit_cmd submit_cmd;
                void __user *userptr =
                        u64_to_user_ptr(args->cmds + (i * sizeof(submit_cmd)));

                ret = copy_from_user(&submit_cmd, userptr, sizeof(submit_cmd));
                if (ret) {
                        ret = -EFAULT;
                        goto out;
                }

                /* validate input from userspace: */
                switch (submit_cmd.type) {
                case MSM_SUBMIT_CMD_BUF:
                case MSM_SUBMIT_CMD_IB_TARGET_BUF:
                case MSM_SUBMIT_CMD_CTX_RESTORE_BUF:
                        break;
                default:
                        return SUBMIT_ERROR(EINVAL, submit, "invalid type: %08x\n", submit_cmd.type);
                }

                if (submit_cmd.size % 4) {
                        ret = SUBMIT_ERROR(EINVAL, submit, "non-aligned cmdstream buffer size: %u\n",
                                           submit_cmd.size);
                        goto out;
                }

                if (msm_context_is_vmbind(ctx)) {
                        if (submit_cmd.nr_relocs) {
                                ret = SUBMIT_ERROR(EINVAL, submit, "nr_relocs must be zero");
                                goto out;
                        }

                        if (submit_cmd.submit_idx || submit_cmd.submit_offset) {
                                ret = SUBMIT_ERROR(EINVAL, submit, "submit_idx/offset must be zero");
                                goto out;
                        }

                        submit->cmd[i].iova = submit_cmd.iova;
                }

                submit->cmd[i].type = submit_cmd.type;
                submit->cmd[i].size = submit_cmd.size / 4;
                submit->cmd[i].offset = submit_cmd.submit_offset / 4;
                submit->cmd[i].idx  = submit_cmd.submit_idx;
                submit->cmd[i].nr_relocs = submit_cmd.nr_relocs;

                userptr = u64_to_user_ptr(submit_cmd.relocs);

                sz = array_size(submit_cmd.nr_relocs,
                                sizeof(struct drm_msm_gem_submit_reloc));
                /* check for overflow: */
                if (sz == SIZE_MAX) {
                        ret = -ENOMEM;
                        goto out;
                }
                submit->cmd[i].relocs = kmalloc(sz, GFP_KERNEL | __GFP_NOWARN);
                if (!submit->cmd[i].relocs) {
                        ret = -ENOMEM;
                        goto out;
                }
                ret = copy_from_user(submit->cmd[i].relocs, userptr, sz);
                if (ret) {
                        ret = -EFAULT;
                        goto out;
                }
        }

out:
        return ret;
}

static int submit_lock_objects_vmbind(struct msm_gem_submit *submit)
{
        unsigned flags = DRM_EXEC_INTERRUPTIBLE_WAIT | DRM_EXEC_IGNORE_DUPLICATES;
        struct drm_exec *exec = &submit->exec;
        int ret = 0;

        drm_exec_init(&submit->exec, flags, submit->nr_bos);

        drm_exec_until_all_locked (&submit->exec) {
                ret = drm_gpuvm_prepare_vm(submit->vm, exec, 1);
                drm_exec_retry_on_contention(exec);
                if (ret)
                        break;

                ret = drm_gpuvm_prepare_objects(submit->vm, exec, 1);
                drm_exec_retry_on_contention(exec);
                if (ret)
                        break;
        }

        return ret;
}

/* This is where we make sure all the bo's are reserved and pin'd: */
static int submit_lock_objects(struct msm_gem_submit *submit)
{
        unsigned flags = DRM_EXEC_INTERRUPTIBLE_WAIT;
        int ret = 0;

        if (msm_context_is_vmbind(submit->queue->ctx))
                return submit_lock_objects_vmbind(submit);

        drm_exec_init(&submit->exec, flags, submit->nr_bos);

        drm_exec_until_all_locked (&submit->exec) {
                ret = drm_exec_lock_obj(&submit->exec,
                                        drm_gpuvm_resv_obj(submit->vm));
                drm_exec_retry_on_contention(&submit->exec);
                if (ret)
                        break;
                for (unsigned i = 0; i < submit->nr_bos; i++) {
                        struct drm_gem_object *obj = submit->bos[i].obj;
                        ret = drm_exec_prepare_obj(&submit->exec, obj, 1);
                        drm_exec_retry_on_contention(&submit->exec);
                        if (ret)
                                break;
                }
        }

        return ret;
}

static int submit_fence_sync(struct msm_gem_submit *submit)
{
        int i, ret = 0;

        for (i = 0; i < submit->nr_bos; i++) {
                struct drm_gem_object *obj = submit->bos[i].obj;
                bool write = submit->bos[i].flags & MSM_SUBMIT_BO_WRITE;

                /* Otherwise userspace can ask for implicit sync to be
                 * disabled on specific buffers.  This is useful for internal
                 * usermode driver managed buffers, suballocation, etc.
                 */
                if (submit->bos[i].flags & MSM_SUBMIT_BO_NO_IMPLICIT)
                        continue;

                ret = drm_sched_job_add_implicit_dependencies(&submit->base,
                                                              obj,
                                                              write);
                if (ret)
                        break;
        }

        return ret;
}

static int submit_pin_objects(struct msm_gem_submit *submit)
{
        struct msm_drm_private *priv = submit->dev->dev_private;
        int i, ret = 0;

        for (i = 0; i < submit->nr_bos; i++) {
                struct drm_gem_object *obj = submit->bos[i].obj;
                struct drm_gpuva *vma;

                /* if locking succeeded, pin bo: */
                vma = msm_gem_get_vma_locked(obj, submit->vm);
                if (IS_ERR(vma)) {
                        ret = PTR_ERR(vma);
                        break;
                }

                ret = msm_gem_pin_vma_locked(obj, vma);
                if (ret)
                        break;

                submit->bos[i].vm_bo = drm_gpuvm_bo_get(vma->vm_bo);
                submit->bos[i].iova = vma->va.addr;
        }

        /*
         * A second loop while holding the LRU lock (a) avoids acquiring/dropping
         * the LRU lock for each individual bo, while (b) avoiding holding the
         * LRU lock while calling msm_gem_pin_vma_locked() (which could trigger
         * get_pages() which could trigger reclaim.. and if we held the LRU lock
         * could trigger deadlock with the shrinker).
         */
        mutex_lock(&priv->lru.lock);
        for (i = 0; i < submit->nr_bos; i++) {
                msm_gem_pin_obj_locked(submit->bos[i].obj);
        }
        mutex_unlock(&priv->lru.lock);

        submit->bos_pinned = true;

        return ret;
}

static void submit_unpin_objects(struct msm_gem_submit *submit)
{
        if (!submit->bos_pinned)
                return;

        for (int i = 0; i < submit->nr_bos; i++) {
                struct drm_gem_object *obj = submit->bos[i].obj;

                msm_gem_unpin_locked(obj);
        }

        submit->bos_pinned = false;
}

static void submit_attach_object_fences(struct msm_gem_submit *submit)
{
        struct msm_gem_vm *vm = to_msm_vm(submit->vm);
        struct dma_fence *last_fence;

        if (msm_context_is_vmbind(submit->queue->ctx)) {
                drm_gpuvm_resv_add_fence(submit->vm, &submit->exec,
                                         submit->user_fence,
                                         DMA_RESV_USAGE_BOOKKEEP,
                                         DMA_RESV_USAGE_BOOKKEEP);

                last_fence = vm->last_fence;
                vm->last_fence = dma_fence_unwrap_merge(submit->user_fence, last_fence);
                dma_fence_put(last_fence);

                return;
        }

        for (unsigned i = 0; i < submit->nr_bos; i++) {
                struct drm_gem_object *obj = submit->bos[i].obj;

                if (submit->bos[i].flags & MSM_SUBMIT_BO_WRITE)
                        dma_resv_add_fence(obj->resv, submit->user_fence,
                                           DMA_RESV_USAGE_WRITE);
                else if (submit->bos[i].flags & MSM_SUBMIT_BO_READ)
                        dma_resv_add_fence(obj->resv, submit->user_fence,
                                           DMA_RESV_USAGE_READ);
        }
}

static int submit_bo(struct msm_gem_submit *submit, uint32_t idx,
                struct drm_gem_object **obj, uint64_t *iova)
{
        if (idx >= submit->nr_bos) {
                return SUBMIT_ERROR(EINVAL, submit, "invalid buffer index: %u (out of %u)\n",
                                    idx, submit->nr_bos);
        }

        if (obj)
                *obj = submit->bos[idx].obj;
        if (iova)
                *iova = submit->bos[idx].iova;

        return 0;
}

/* process the reloc's and patch up the cmdstream as needed: */
static int submit_reloc(struct msm_gem_submit *submit, struct drm_gem_object *obj,
                uint32_t offset, uint32_t nr_relocs, struct drm_msm_gem_submit_reloc *relocs)
{
        uint32_t i, last_offset = 0;
        uint32_t *ptr;
        int ret = 0;

        if (offset % 4)
                return SUBMIT_ERROR(EINVAL, submit, "non-aligned cmdstream buffer: %u\n", offset);

        /* For now, just map the entire thing.  Eventually we probably
         * to do it page-by-page, w/ kmap() if not vmap()d..
         */
        ptr = msm_gem_get_vaddr_locked(obj);

        if (IS_ERR(ptr)) {
                ret = PTR_ERR(ptr);
                DBG("failed to map: %d", ret);
                return ret;
        }

        for (i = 0; i < nr_relocs; i++) {
                struct drm_msm_gem_submit_reloc submit_reloc = relocs[i];
                uint32_t off;
                uint64_t iova;

                if (submit_reloc.submit_offset % 4) {
                        ret = SUBMIT_ERROR(EINVAL, submit, "non-aligned reloc offset: %u\n",
                                           submit_reloc.submit_offset);
                        goto out;
                }

                /* offset in dwords: */
                off = submit_reloc.submit_offset / 4;

                if ((off >= (obj->size / 4)) ||
                                (off < last_offset)) {
                        ret = SUBMIT_ERROR(EINVAL, submit, "invalid offset %u at reloc %u\n", off, i);
                        goto out;
                }

                ret = submit_bo(submit, submit_reloc.reloc_idx, NULL, &iova);
                if (ret)
                        goto out;

                iova += submit_reloc.reloc_offset;

                if (submit_reloc.shift < 0)
                        iova >>= -submit_reloc.shift;
                else
                        iova <<= submit_reloc.shift;

                ptr[off] = iova | submit_reloc.or;

                last_offset = off;
        }

out:
        msm_gem_put_vaddr_locked(obj);

        return ret;
}

/* Cleanup submit at end of ioctl.  In the error case, this also drops
 * references, unpins, and drops active refcnt.  In the non-error case,
 * this is done when the submit is retired.
 */
static void submit_cleanup(struct msm_gem_submit *submit, bool error)
{
        if (error)
                submit_unpin_objects(submit);

        if (submit->exec.objects)
                drm_exec_fini(&submit->exec);

        /* if job wasn't enqueued to scheduler, early retirement: */
        if (error)
                msm_submit_retire(submit);
}

void msm_submit_retire(struct msm_gem_submit *submit)
{
        int i;

        for (i = 0; i < submit->nr_bos; i++) {
                struct drm_gem_object *obj = submit->bos[i].obj;
                struct drm_gpuvm_bo *vm_bo = submit->bos[i].vm_bo;

                msm_gem_lock(obj);
                drm_gpuvm_bo_put(vm_bo);
                msm_gem_unlock(obj);
                drm_gem_object_put(obj);
        }
}

int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
                struct drm_file *file)
{
        struct msm_drm_private *priv = dev->dev_private;
        struct drm_msm_gem_submit *args = data;
        struct msm_context *ctx = file->driver_priv;
        struct msm_gem_submit *submit = NULL;
        struct msm_gpu *gpu = priv->gpu;
        struct msm_gpu_submitqueue *queue;
        struct msm_ringbuffer *ring;
        struct msm_syncobj_post_dep *post_deps = NULL;
        struct drm_syncobj **syncobjs_to_reset = NULL;
        struct sync_file *sync_file = NULL;
        unsigned cmds_to_parse;
        int out_fence_fd = -1;
        unsigned i;
        int ret;

        if (!gpu)
                return -ENXIO;

        if (args->pad)
                return -EINVAL;

        if (to_msm_vm(ctx->vm)->unusable)
                return UERR(EPIPE, dev, "context is unusable");

        /* for now, we just have 3d pipe.. eventually this would need to
         * be more clever to dispatch to appropriate gpu module:
         */
        if (MSM_PIPE_ID(args->flags) != MSM_PIPE_3D0)
                return UERR(EINVAL, dev, "invalid pipe");

        if (MSM_PIPE_FLAGS(args->flags) & ~MSM_SUBMIT_FLAGS)
                return UERR(EINVAL, dev, "invalid flags");

        if (args->flags & MSM_SUBMIT_SUDO) {
                if (!IS_ENABLED(CONFIG_DRM_MSM_GPU_SUDO) ||
                    !capable(CAP_SYS_RAWIO))
                        return -EINVAL;
        }

        queue = msm_submitqueue_get(ctx, args->queueid);
        if (!queue)
                return -ENOENT;

        if (queue->flags & MSM_SUBMITQUEUE_VM_BIND) {
                ret = UERR(EINVAL, dev, "Invalid queue type");
                goto out_post_unlock;
        }

        ring = gpu->rb[queue->ring_nr];

        if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) {
                out_fence_fd = get_unused_fd_flags(O_CLOEXEC);
                if (out_fence_fd < 0) {
                        ret = out_fence_fd;
                        goto out_post_unlock;
                }
        }

        submit = submit_create(dev, gpu, queue, args->nr_bos, args->nr_cmds,
                               file->client_id);
        if (IS_ERR(submit)) {
                ret = PTR_ERR(submit);
                goto out_post_unlock;
        }

        trace_msm_gpu_submit(pid_nr(submit->pid), ring->id, submit->ident,
                args->nr_bos, args->nr_cmds);

        ret = mutex_lock_interruptible(&queue->lock);
        if (ret)
                goto out_post_unlock;

        if (args->flags & MSM_SUBMIT_SUDO)
                submit->in_rb = true;

        if (args->flags & MSM_SUBMIT_FENCE_FD_IN) {
                struct dma_fence *in_fence;

                in_fence = sync_file_get_fence(args->fence_fd);

                if (!in_fence) {
                        ret = UERR(EINVAL, dev, "invalid in-fence");
                        goto out_unlock;
                }

                ret = drm_sched_job_add_dependency(&submit->base, in_fence);
                if (ret)
                        goto out_unlock;
        }

        if (args->flags & MSM_SUBMIT_SYNCOBJ_IN) {
                syncobjs_to_reset = msm_syncobj_parse_deps(dev, &submit->base,
                                                           file, args->in_syncobjs,
                                                           args->nr_in_syncobjs,
                                                           args->syncobj_stride);
                if (IS_ERR(syncobjs_to_reset)) {
                        ret = PTR_ERR(syncobjs_to_reset);
                        goto out_unlock;
                }
        }

        if (args->flags & MSM_SUBMIT_SYNCOBJ_OUT) {
                post_deps = msm_syncobj_parse_post_deps(dev, file,
                                                        args->out_syncobjs,
                                                        args->nr_out_syncobjs,
                                                        args->syncobj_stride);
                if (IS_ERR(post_deps)) {
                        ret = PTR_ERR(post_deps);
                        goto out_unlock;
                }
        }

        ret = submit_lookup_objects(submit, args, file);
        if (ret)
                goto out;

        ret = submit_lookup_cmds(submit, args, file);
        if (ret)
                goto out;

        /* copy_*_user while holding a ww ticket upsets lockdep */
        ret = submit_lock_objects(submit);
        if (ret)
                goto out;

        if (!(args->flags & MSM_SUBMIT_NO_IMPLICIT)) {
                ret = submit_fence_sync(submit);
                if (ret)
                        goto out;
        }

        ret = submit_pin_objects(submit);
        if (ret)
                goto out;

        cmds_to_parse = msm_context_is_vmbind(ctx) ? 0 : args->nr_cmds;

        for (i = 0; i < cmds_to_parse; i++) {
                struct drm_gem_object *obj;
                uint64_t iova;

                ret = submit_bo(submit, submit->cmd[i].idx, &obj, &iova);
                if (ret)
                        goto out;

                if (!submit->cmd[i].size ||
                    (size_add(submit->cmd[i].size, submit->cmd[i].offset) > obj->size / 4)) {
                        ret = UERR(EINVAL, dev, "invalid cmdstream size: %u\n",
                                   submit->cmd[i].size * 4);
                        goto out;
                }

                submit->cmd[i].iova = iova + (submit->cmd[i].offset * 4);

                if (likely(!submit->cmd[i].nr_relocs))
                        continue;

                if (!gpu->allow_relocs) {
                        ret = UERR(EINVAL, dev, "relocs not allowed\n");
                        goto out;
                }

                ret = submit_reloc(submit, obj, submit->cmd[i].offset * 4,
                                submit->cmd[i].nr_relocs, submit->cmd[i].relocs);
                if (ret)
                        goto out;
        }

        submit->nr_cmds = args->nr_cmds;

        idr_preload(GFP_KERNEL);

        spin_lock(&queue->idr_lock);

        /*
         * If using userspace provided seqno fence, validate that the id
         * is available before arming sched job.  Since access to fence_idr
         * is serialized on the queue lock, the slot should be still avail
         * after the job is armed
         */
        if ((args->flags & MSM_SUBMIT_FENCE_SN_IN) &&
                        (!args->fence || idr_find(&queue->fence_idr, args->fence))) {
                spin_unlock(&queue->idr_lock);
                idr_preload_end();
                ret = UERR(EINVAL, dev, "invalid in-fence-sn");
                goto out;
        }

        drm_sched_job_arm(&submit->base);

        submit->user_fence = dma_fence_get(&submit->base.s_fence->finished);

        if (args->flags & MSM_SUBMIT_FENCE_SN_IN) {
                /*
                 * Userspace has assigned the seqno fence that it wants
                 * us to use.  It is an error to pick a fence sequence
                 * number that is not available.
                 */
                submit->fence_id = args->fence;
                ret = idr_alloc_u32(&queue->fence_idr, submit->user_fence,
                                    &submit->fence_id, submit->fence_id,
                                    GFP_NOWAIT);
                /*
                 * We've already validated that the fence_id slot is valid,
                 * so if idr_alloc_u32 failed, it is a kernel bug
                 */
                WARN_ON(ret);
        } else {
                /*
                 * Allocate an id which can be used by WAIT_FENCE ioctl to map
                 * back to the underlying fence.
                 */
                submit->fence_id = idr_alloc_cyclic(&queue->fence_idr,
                                                    submit->user_fence, 1,
                                                    INT_MAX, GFP_NOWAIT);
        }

        spin_unlock(&queue->idr_lock);
        idr_preload_end();

        if (submit->fence_id < 0) {
                ret = submit->fence_id;
                submit->fence_id = 0;
        }

        if (ret == 0 && args->flags & MSM_SUBMIT_FENCE_FD_OUT) {
                sync_file = sync_file_create(submit->user_fence);
                if (!sync_file)
                        ret = -ENOMEM;
        }

        if (ret)
                goto out;

        submit_attach_object_fences(submit);

        if (msm_context_is_vmbind(ctx)) {
                /*
                 * If we are not using VM_BIND, submit_pin_vmas() will validate
                 * just the BOs attached to the submit.  In that case we don't
                 * need to validate the _entire_ vm, because userspace tracked
                 * what BOs are associated with the submit.
                 */
                ret = drm_gpuvm_validate(submit->vm, &submit->exec);
                if (ret)
                        goto out;
        }

        /* The scheduler owns a ref now: */
        msm_gem_submit_get(submit);

        msm_rd_dump_submit(priv->rd, submit, NULL);

        drm_sched_entity_push_job(&submit->base);

        args->fence = submit->fence_id;
        queue->last_fence = submit->fence_id;

        msm_syncobj_reset(syncobjs_to_reset, args->nr_in_syncobjs);
        msm_syncobj_process_post_deps(post_deps, args->nr_out_syncobjs, submit->user_fence);

out:
        submit_cleanup(submit, !!ret);
out_unlock:
        mutex_unlock(&queue->lock);
out_post_unlock:
        if (ret) {
                if (out_fence_fd >= 0)
                        put_unused_fd(out_fence_fd);
                if (sync_file)
                        fput(sync_file->file);
        } else if (sync_file) {
                fd_install(out_fence_fd, sync_file->file);
                args->fence_fd = out_fence_fd;
        }

        if (!IS_ERR_OR_NULL(submit)) {
                msm_gem_submit_put(submit);
        } else {
                /*
                 * If the submit hasn't yet taken ownership of the queue
                 * then we need to drop the reference ourself:
                 */
                msm_submitqueue_put(queue);
        }
        if (!IS_ERR_OR_NULL(post_deps)) {
                for (i = 0; i < args->nr_out_syncobjs; ++i) {
                        kfree(post_deps[i].chain);
                        drm_syncobj_put(post_deps[i].syncobj);
                }
                kfree(post_deps);
        }

        if (!IS_ERR_OR_NULL(syncobjs_to_reset)) {
                for (i = 0; i < args->nr_in_syncobjs; ++i) {
                        if (syncobjs_to_reset[i])
                                drm_syncobj_put(syncobjs_to_reset[i]);
                }
                kfree(syncobjs_to_reset);
        }

        return ret;
}
Linux
