diff options
| author | Rob Clark <robdclark@chromium.org> | 2025-06-29 13:13:04 -0700 |
|---|---|---|
| committer | Rob Clark <robin.clark@oss.qualcomm.com> | 2025-07-04 17:48:36 -0700 |
| commit | 6bf32afd37eb6806403eff8b8e5c85ccf5723c9b (patch) | |
| tree | c85e7181e88130402bac17583cd260ff2b36f6e1 /drivers/gpu/drm/msm/msm_drv.c | |
| parent | 5b5582c6b8845cb11e7c62443b0b243953f716da (diff) | |
drm/msm: Lazily create context VM
In the next commit, a way for userspace to opt-in to userspace managed
VM is added. For this to work, we need to defer creation of the VM
until it is needed.
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>
Tested-by: Antonino Maniscalco <antomani103@gmail.com>
Reviewed-by: Antonino Maniscalco <antomani103@gmail.com>
Patchwork: https://patchwork.freedesktop.org/patch/661490/
Diffstat (limited to 'drivers/gpu/drm/msm/msm_drv.c')
| -rw-r--r-- | drivers/gpu/drm/msm/msm_drv.c | 29 |
1 files changed, 24 insertions, 5 deletions
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c index 91ced01041c9..cf0805ed4c75 100644 --- a/drivers/gpu/drm/msm/msm_drv.c +++ b/drivers/gpu/drm/msm/msm_drv.c @@ -218,10 +218,29 @@ static void load_gpu(struct drm_device *dev) mutex_unlock(&init_lock); } +/** + * msm_context_vm - lazily create the context's VM + * + * @dev: the drm device + * @ctx: the context + * + * The VM is lazily created, so that userspace has a chance to opt-in to having + * a userspace managed VM before the VM is created. + * + * Note that this does not return a reference to the VM. Once the VM is created, + * it exists for the lifetime of the context. + */ +struct drm_gpuvm *msm_context_vm(struct drm_device *dev, struct msm_context *ctx) +{ + struct msm_drm_private *priv = dev->dev_private; + if (!ctx->vm) + ctx->vm = msm_gpu_create_private_vm(priv->gpu, current); + return ctx->vm; +} + static int context_init(struct drm_device *dev, struct drm_file *file) { static atomic_t ident = ATOMIC_INIT(0); - struct msm_drm_private *priv = dev->dev_private; struct msm_context *ctx; ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); @@ -234,7 +253,6 @@ static int context_init(struct drm_device *dev, struct drm_file *file) kref_init(&ctx->ref); msm_submitqueue_init(dev, ctx); - ctx->vm = msm_gpu_create_private_vm(priv->gpu, current); file->driver_priv = ctx; ctx->seqno = atomic_inc_return(&ident); @@ -413,7 +431,7 @@ static int msm_ioctl_gem_info_iova(struct drm_device *dev, * Don't pin the memory here - just get an address so that userspace can * be productive */ - return msm_gem_get_iova(obj, ctx->vm, iova); + return msm_gem_get_iova(obj, msm_context_vm(dev, ctx), iova); } static int msm_ioctl_gem_info_set_iova(struct drm_device *dev, @@ -422,18 +440,19 @@ static int msm_ioctl_gem_info_set_iova(struct drm_device *dev, { struct msm_drm_private *priv = dev->dev_private; struct msm_context *ctx = file->driver_priv; + struct drm_gpuvm *vm = msm_context_vm(dev, ctx); if (!priv->gpu) return -EINVAL; /* Only supported if per-process address space is supported: */ - if (priv->gpu->vm == ctx->vm) + if (priv->gpu->vm == vm) return UERR(EOPNOTSUPP, dev, "requires per-process pgtables"); if (should_fail(&fail_gem_iova, obj->size)) return -ENOMEM; - return msm_gem_set_iova(obj, ctx->vm, iova); + return msm_gem_set_iova(obj, vm, iova); } static int msm_ioctl_gem_info_set_metadata(struct drm_gem_object *obj, |