On 04.05.2018 16:37, Thierry Reding wrote:
> From: Thierry Reding <tred...@nvidia.com>
>
> Attaching to and detaching from an IOMMU uses the same code sequence in
> every driver, so factor it out into separate helpers.
>
> Signed-off-by: Thierry Reding <tred...@nvidia.com>
> ---
> drivers/gpu/drm/tegra/dc.c | 42 ++++++------------------------------
> drivers/gpu/drm/tegra/drm.c | 42 ++++++++++++++++++++++++++++++++++++
> drivers/gpu/drm/tegra/drm.h | 4 ++++
> drivers/gpu/drm/tegra/gr2d.c | 32 +++++++--------------------
> drivers/gpu/drm/tegra/gr3d.c | 31 ++++++--------------------
> 5 files changed, 68 insertions(+), 83 deletions(-)
>
> diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
> index c843f11043db..3e7ec3937346 100644
> --- a/drivers/gpu/drm/tegra/dc.c
> +++ b/drivers/gpu/drm/tegra/dc.c
> @@ -1837,21 +1837,11 @@ static int tegra_dc_init(struct host1x_client *client)
> if (!dc->syncpt)
> dev_warn(dc->dev, "failed to allocate syncpoint\n");
>
> - if (tegra->domain) {
> - dc->group = iommu_group_get(client->dev);
> -
> - if (dc->group && dc->group != tegra->group) {
> - err = iommu_attach_group(tegra->domain, dc->group);
> - if (err < 0) {
> - dev_err(dc->dev,
> - "failed to attach to domain: %d\n",
> - err);
> - iommu_group_put(dc->group);
> - return err;
> - }
> -
> - tegra->group = dc->group;
> - }
> + dc->group = host1x_client_iommu_attach(client, true);
> + if (IS_ERR(dc->group)) {
> + err = PTR_ERR(dc->group);
> + dev_err(client->dev, "failed to attach to domain: %d\n", err);
> + return err;
> }
>
> if (dc->soc->wgrps)
> @@ -1916,15 +1906,7 @@ static int tegra_dc_init(struct host1x_client *client)
> if (!IS_ERR(primary))
> drm_plane_cleanup(primary);
>
> - if (dc->group) {
> - if (dc->group == tegra->group) {
> - iommu_detach_group(tegra->domain, dc->group);
> - tegra->group = NULL;
> - }
> -
> - iommu_group_put(dc->group);
> - }
> -
> + host1x_client_iommu_detach(client, dc->group);
> host1x_syncpt_free(dc->syncpt);
>
> return err;
> @@ -1932,9 +1914,7 @@ static int tegra_dc_init(struct host1x_client *client)
>
> static int tegra_dc_exit(struct host1x_client *client)
> {
> - struct drm_device *drm = dev_get_drvdata(client->parent);
> struct tegra_dc *dc = host1x_client_to_dc(client);
> - struct tegra_drm *tegra = drm->dev_private;
> int err;
>
> devm_free_irq(dc->dev, dc->irq, dc);
> @@ -1945,15 +1925,7 @@ static int tegra_dc_exit(struct host1x_client *client)
> return err;
> }
>
> - if (dc->group) {
> - if (dc->group == tegra->group) {
> - iommu_detach_group(tegra->domain, dc->group);
> - tegra->group = NULL;
> - }
> -
> - iommu_group_put(dc->group);
> - }
> -
> + host1x_client_iommu_detach(client, dc->group);
> host1x_syncpt_free(dc->syncpt);
>
> return 0;
> diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
> index 7afe2f635f74..bc1008305e1e 100644
> --- a/drivers/gpu/drm/tegra/drm.c
> +++ b/drivers/gpu/drm/tegra/drm.c
> @@ -1114,6 +1114,48 @@ int tegra_drm_unregister_client(struct tegra_drm
> *tegra,
> return 0;
> }
>
> +struct iommu_group *host1x_client_iommu_attach(struct host1x_client *client,
> + bool shared)
> +{
> + struct drm_device *drm = dev_get_drvdata(client->parent);
> + struct tegra_drm *tegra = drm->dev_private;
> + struct iommu_group *group = NULL;
> + int err;
> +
> + if (tegra->domain) {
> + group = iommu_group_get(client->dev);
> +
> + if (group && (!shared || (shared && (group != tegra->group)))) {
> + err = iommu_attach_group(tegra->domain, group);
> + if (err < 0) {
> + iommu_group_put(group);
> + return ERR_PTR(err);
> + }
> +
> + if (shared && !tegra->group)
> + tegra->group = group;
Nit: Probably it doesn't make much sense to have devices unattached to BO's AS,
what about to error out here or at least display a error/warning message?
@@ -1796,7 +1796,12 @@ struct iommu_group *host1x_client_iommu_attach(struct
host1x_client *client,
if (tegra->domain) {
group = iommu_group_get(client->dev);
- if (group && (!shared || (shared && (group != tegra->group)))) {
+ if (!group) {
+ dev_err(client->dev, "Failed to get IOMMU group\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ if (!shared || group != tegra->group) {
err = iommu_attach_group(tegra->domain, group);
if (err < 0) {
iommu_group_put(group);
> + }
> + }
> +
> + return group;
> +}
> +
> +void host1x_client_iommu_detach(struct host1x_client *client,
> + struct iommu_group *group)
> +{
> + struct drm_device *drm = dev_get_drvdata(client->parent);
> + struct tegra_drm *tegra = drm->dev_private;
> +
> + if (group) {
> + if (group == tegra->group) {
> + iommu_detach_group(tegra->domain, group);
> + tegra->group = NULL;
> + }
> +
> + iommu_group_put(group);
> + }
> +}
> +
> void *tegra_drm_alloc(struct tegra_drm *tegra, size_t size, dma_addr_t *dma)
> {
> struct iova *alloc;
> diff --git a/drivers/gpu/drm/tegra/drm.h b/drivers/gpu/drm/tegra/drm.h
> index 4f41aaec8530..fe263cf58f34 100644
> --- a/drivers/gpu/drm/tegra/drm.h
> +++ b/drivers/gpu/drm/tegra/drm.h
> @@ -110,6 +110,10 @@ int tegra_drm_register_client(struct tegra_drm *tegra,
> struct tegra_drm_client *client);
> int tegra_drm_unregister_client(struct tegra_drm *tegra,
> struct tegra_drm_client *client);
> +struct iommu_group *host1x_client_iommu_attach(struct host1x_client *client,
> + bool shared);
> +void host1x_client_iommu_detach(struct host1x_client *client,
> + struct iommu_group *group);
>
> int tegra_drm_init(struct tegra_drm *tegra, struct drm_device *drm);
> int tegra_drm_exit(struct tegra_drm *tegra);
> diff --git a/drivers/gpu/drm/tegra/gr2d.c b/drivers/gpu/drm/tegra/gr2d.c
> index 0b42e99da8ad..2cd0f66c8aa9 100644
> --- a/drivers/gpu/drm/tegra/gr2d.c
> +++ b/drivers/gpu/drm/tegra/gr2d.c
> @@ -32,7 +32,6 @@ static int gr2d_init(struct host1x_client *client)
> struct tegra_drm_client *drm = host1x_to_drm_client(client);
> struct drm_device *dev = dev_get_drvdata(client->parent);
> unsigned long flags = HOST1X_SYNCPT_HAS_BASE;
> - struct tegra_drm *tegra = dev->dev_private;
> struct gr2d *gr2d = to_gr2d(drm);
> int err;
>
> @@ -47,22 +46,14 @@ static int gr2d_init(struct host1x_client *client)
> goto put;
> }
>
> - if (tegra->domain) {
> - gr2d->group = iommu_group_get(client->dev);
> -
> - if (gr2d->group) {
> - err = iommu_attach_group(tegra->domain, gr2d->group);
> - if (err < 0) {
> - dev_err(client->dev,
> - "failed to attach to domain: %d\n",
> - err);
> - iommu_group_put(gr2d->group);
> - goto free;
> - }
> - }
> + gr2d->group = host1x_client_iommu_attach(client, false);
> + if (IS_ERR(gr2d->group)) {
> + err = PTR_ERR(gr2d->group);
> + dev_err(client->dev, "failed to attach to domain: %d\n", err);
> + goto free;
> }
>
> - err = tegra_drm_register_client(tegra, drm);
> + err = tegra_drm_register_client(dev->dev_private, drm);
> if (err < 0) {
> dev_err(client->dev, "failed to register client: %d\n", err);
> goto detach;
> @@ -71,10 +62,7 @@ static int gr2d_init(struct host1x_client *client)
> return 0;
>
> detach:
> - if (gr2d->group) {
> - iommu_detach_group(tegra->domain, gr2d->group);
> - iommu_group_put(gr2d->group);
> - }
> + host1x_client_iommu_detach(client, gr2d->group);
> free:
> host1x_syncpt_free(client->syncpts[0]);
> put:
> @@ -94,14 +82,10 @@ static int gr2d_exit(struct host1x_client *client)
> if (err < 0)
> return err;
>
> + host1x_client_iommu_detach(client, gr2d->group);
> host1x_syncpt_free(client->syncpts[0]);
> host1x_channel_put(gr2d->channel);
>
> - if (gr2d->group) {
> - iommu_detach_group(tegra->domain, gr2d->group);
> - iommu_group_put(gr2d->group);
> - }
> -
> return 0;
> }
>
> diff --git a/drivers/gpu/drm/tegra/gr3d.c b/drivers/gpu/drm/tegra/gr3d.c
> index e129f1afff33..98e3c67d0fb5 100644
> --- a/drivers/gpu/drm/tegra/gr3d.c
> +++ b/drivers/gpu/drm/tegra/gr3d.c
> @@ -42,7 +42,6 @@ static int gr3d_init(struct host1x_client *client)
> struct tegra_drm_client *drm = host1x_to_drm_client(client);
> struct drm_device *dev = dev_get_drvdata(client->parent);
> unsigned long flags = HOST1X_SYNCPT_HAS_BASE;
> - struct tegra_drm *tegra = dev->dev_private;
> struct gr3d *gr3d = to_gr3d(drm);
> int err;
>
> @@ -56,19 +55,11 @@ static int gr3d_init(struct host1x_client *client)
> goto put;
> }
>
> - if (tegra->domain) {
> - gr3d->group = iommu_group_get(client->dev);
> -
> - if (gr3d->group) {
> - err = iommu_attach_group(tegra->domain, gr3d->group);
> - if (err < 0) {
> - dev_err(client->dev,
> - "failed to attach to domain: %d\n",
> - err);
> - iommu_group_put(gr3d->group);
> - goto free;
> - }
> - }
> + gr3d->group = host1x_client_iommu_attach(client, false);
> + if (IS_ERR(gr3d->group)) {
> + err = PTR_ERR(gr3d->group);
> + dev_err(client->dev, "failed to attach to domain: %d\n", err);
> + goto free;
> }
>
> err = tegra_drm_register_client(dev->dev_private, drm);
> @@ -80,10 +71,7 @@ static int gr3d_init(struct host1x_client *client)
> return 0;
>
> detach:
> - if (gr3d->group) {
> - iommu_detach_group(tegra->domain, gr3d->group);
> - iommu_group_put(gr3d->group);
> - }
> + host1x_client_iommu_detach(client, gr3d->group);
> free:
> host1x_syncpt_free(client->syncpts[0]);
> put:
> @@ -95,7 +83,6 @@ static int gr3d_exit(struct host1x_client *client)
> {
> struct tegra_drm_client *drm = host1x_to_drm_client(client);
> struct drm_device *dev = dev_get_drvdata(client->parent);
> - struct tegra_drm *tegra = dev->dev_private;
> struct gr3d *gr3d = to_gr3d(drm);
> int err;
>
> @@ -103,14 +90,10 @@ static int gr3d_exit(struct host1x_client *client)
> if (err < 0)
> return err;
>
> + host1x_client_iommu_detach(client, gr3d->group);
> host1x_syncpt_free(client->syncpts[0]);
> host1x_channel_put(gr3d->channel);
>
> - if (gr3d->group) {
> - iommu_detach_group(tegra->domain, gr3d->group);
> - iommu_group_put(gr3d->group);
> - }
> -
> return 0;
> }
>
>
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