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drm/tegra: Simplify IOMMU group selection

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All the devices that make up the DRM device are now part of the same
IOMMU group. This simplifies the handling of the IOMMU attachment and
also avoids exhausting the number of IOMMUs available on early Tegra
SoC generations.

Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2019-10-28 13:37:08 +01:00
parent a7303f7735
commit 7edd7961e5
6 changed files with 25 additions and 20 deletions
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2
drivers/gpu/drm/tegra/dc.c
View File

@ -2014,7 +2014,7 @@ static int tegra_dc_init(struct host1x_client *client)
if (!dc->syncpt)
dev_warn(dc->dev, "failed to allocate syncpoint\n");
err = host1x_client_iommu_attach(client, true);
err = host1x_client_iommu_attach(client);
if (err < 0) {
dev_err(client->dev, "failed to attach to domain: %d\n", err);
return err;

34
drivers/gpu/drm/tegra/drm.c
View File

@ -904,7 +904,7 @@ int tegra_drm_unregister_client(struct tegra_drm *tegra,
return 0;
}
int host1x_client_iommu_attach(struct host1x_client *client, bool shared)
int host1x_client_iommu_attach(struct host1x_client *client)
{
struct drm_device *drm = dev_get_drvdata(client->parent);
struct tegra_drm *tegra = drm->dev_private;
@ -912,29 +912,30 @@ int host1x_client_iommu_attach(struct host1x_client *client, bool shared)
int err;
if (tegra->domain) {
struct iommu_domain *domain;
group = iommu_group_get(client->dev);
if (!group) {
dev_err(client->dev, "failed to get IOMMU group\n");
return -ENODEV;
}
if (!shared || (shared && (group != tegra->group))) {
#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
if (client->dev->archdata.mapping) {
struct dma_iommu_mapping *mapping =
to_dma_iommu_mapping(client->dev);
arm_iommu_detach_device(client->dev);
arm_iommu_release_mapping(mapping);
}
if (client->dev->archdata.mapping) {
struct dma_iommu_mapping *mapping =
to_dma_iommu_mapping(client->dev);
arm_iommu_detach_device(client->dev);
arm_iommu_release_mapping(mapping);
}
#endif
domain = iommu_get_domain_for_dev(client->dev);
if (domain != tegra->domain) {
err = iommu_attach_group(tegra->domain, group);
if (err < 0) {
iommu_group_put(group);
return err;
}
if (shared && !tegra->group)
tegra->group = group;
}
}
@ -947,12 +948,17 @@ void host1x_client_iommu_detach(struct host1x_client *client)
{
struct drm_device *drm = dev_get_drvdata(client->parent);
struct tegra_drm *tegra = drm->dev_private;
struct iommu_domain *domain;
if (client->group) {
if (client->group == tegra->group) {
/*
* Devices that are part of the same group may no longer be
* attached to a domain at this point because their group may
* have been detached by an earlier client.
*/
domain = iommu_get_domain_for_dev(client->dev);
if (domain)
iommu_detach_group(tegra->domain, client->group);
tegra->group = NULL;
}
iommu_group_put(client->group);
}

3
drivers/gpu/drm/tegra/drm.h
View File

@ -36,7 +36,6 @@ struct tegra_drm {
struct drm_device *drm;
struct iommu_domain *domain;
struct iommu_group *group;
struct mutex mm_lock;
struct drm_mm mm;
@ -100,7 +99,7 @@ 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);
int host1x_client_iommu_attach(struct host1x_client *client, bool shared);
int host1x_client_iommu_attach(struct host1x_client *client);
void host1x_client_iommu_detach(struct host1x_client *client);
int tegra_drm_init(struct tegra_drm *tegra, struct drm_device *drm);

2
drivers/gpu/drm/tegra/gr2d.c
View File

@ -50,7 +50,7 @@ static int gr2d_init(struct host1x_client *client)
goto put;
}
err = host1x_client_iommu_attach(client, false);
err = host1x_client_iommu_attach(client);
if (err < 0) {
dev_err(client->dev, "failed to attach to domain: %d\n", err);
goto free;

2
drivers/gpu/drm/tegra/gr3d.c
View File

@ -59,7 +59,7 @@ static int gr3d_init(struct host1x_client *client)
goto put;
}
err = host1x_client_iommu_attach(client, false);
err = host1x_client_iommu_attach(client);
if (err < 0) {
dev_err(client->dev, "failed to attach to domain: %d\n", err);
goto free;

2
drivers/gpu/drm/tegra/vic.c
View File

@ -187,7 +187,7 @@ static int vic_init(struct host1x_client *client)
struct vic *vic = to_vic(drm);
int err;
err = host1x_client_iommu_attach(client, false);
err = host1x_client_iommu_attach(client);
if (err < 0) {
dev_err(vic->dev, "failed to attach to domain: %d\n", err);
return err;