On Fri, May 04, 2018 at 02:47:20AM +0300, Dmitry Osipenko wrote:
> Attach GR2D to the display IOMMU group in order to provide GR2D access
> to BO's IOVA.
>
> Signed-off-by: Dmitry Osipenko <dig...@gmail.com>
> ---
> drivers/gpu/drm/tegra/gr2d.c | 31 +++++++++++++++++++++++++++++--
> 1 file changed, 29 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/tegra/gr2d.c b/drivers/gpu/drm/tegra/gr2d.c
> index 9a8ea93016a9..8eb530a85dd0 100644
> --- a/drivers/gpu/drm/tegra/gr2d.c
> +++ b/drivers/gpu/drm/tegra/gr2d.c
> @@ -7,12 +7,14 @@
> */
>
> #include <linux/clk.h>
> +#include <linux/iommu.h>
>
> #include "drm.h"
> #include "gem.h"
> #include "gr2d.h"
>
> struct gr2d {
> + struct iommu_group *group;
> struct tegra_drm_client client;
> struct host1x_channel *channel;
> struct clk *clk;
> @@ -30,7 +32,9 @@ 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;
>
> gr2d->channel = host1x_channel_request(client->dev);
> if (!gr2d->channel)
> @@ -42,23 +46,46 @@ static int gr2d_init(struct host1x_client *client)
> return -ENOMEM;
> }
>
> - return tegra_drm_register_client(dev->dev_private, drm);
> + 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);
> + host1x_syncpt_free(client->syncpts[0]);
> + host1x_channel_put(gr2d->channel);
> + iommu_group_put(gr2d->group);
> + return err;
> + }
> + }
> + }
This is almost identical to the code in DC, perhaps we should factor
this out into a separate helper? Nothing that needs to be done right
now, I'll take a look at it and see if I can come up with something
good in a follow-up patch.
> +
> + return tegra_drm_register_client(tegra, drm);
> }
>
> static int gr2d_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 gr2d *gr2d = to_gr2d(drm);
> int err;
>
> - err = tegra_drm_unregister_client(dev->dev_private, drm);
> + err = tegra_drm_unregister_client(tegra, drm);
> if (err < 0)
> return err;
>
> 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;
> }
>
Thierry
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