On 04.05.2018 18:10, Thierry Reding wrote:
> On Fri, May 04, 2018 at 05:23:42PM +0300, Dmitry Osipenko wrote:
>> On 04.05.2018 16:37, Thierry Reding wrote:
>>> From: Thierry Reding <treding@xxxxxxxxxx>
>>>
>>> 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 <treding@xxxxxxxxxx>
>>> ---
>>> 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;
>>> + }
>>> + }
>>> +
>>> + 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;
>>> }
>>>
>>>
>>
>> Reviewed-by: Dmitry Osipenko <digetx@xxxxxxxxx>
>>
>> Though I'd prefer to have tegra->group renamed, maybe to 'shared_dc_group'.
>
> tegra->group doesn't bother me at all. I think just the fact that it's
> in struct tegra_drm implies that it is shared. It's also declared
> closely to all the other "shared" variables, so I think that makes it
> pretty clear. If there were other IOMMU groups I'd agree that renaming
> it would be good to clarify the purpose. But as it is, I think there's
> no need for that.
>
> Thanks for the review!
Well, okay. On the other hand IOMMU API should handle re-attaching from a
different device and then that shared group isn't needed at all. Does that
re-attaching cause any problems right now? If yes, maybe it's worth fixing the
root of the problem rather than trying to workaround it.
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