[PATCH v8 09/14] drm/tegra: Implement new UAPI
Thierry Reding
thierry.reding at gmail.com
Fri Jul 9 19:31:41 UTC 2021
From: Mikko Perttunen <mperttunen at nvidia.com>
Implement the non-submission parts of the new UAPI, including
channel management and memory mapping. The UAPI is under the
CONFIG_DRM_TEGRA_STAGING config flag for now.
Signed-off-by: Mikko Perttunen <mperttunen at nvidia.com>
Signed-off-by: Thierry Reding <treding at nvidia.com>
---
Changes in v8:
- rebase on top of latest UABI changes
drivers/gpu/drm/tegra/Makefile | 1 +
drivers/gpu/drm/tegra/drm.c | 37 ++--
drivers/gpu/drm/tegra/drm.h | 10 ++
drivers/gpu/drm/tegra/uapi.c | 313 +++++++++++++++++++++++++++++++++
drivers/gpu/drm/tegra/uapi.h | 51 ++++++
5 files changed, 396 insertions(+), 16 deletions(-)
create mode 100644 drivers/gpu/drm/tegra/uapi.c
create mode 100644 drivers/gpu/drm/tegra/uapi.h
diff --git a/drivers/gpu/drm/tegra/Makefile b/drivers/gpu/drm/tegra/Makefile
index d6cf202414f0..783475ffd943 100644
--- a/drivers/gpu/drm/tegra/Makefile
+++ b/drivers/gpu/drm/tegra/Makefile
@@ -3,6 +3,7 @@ ccflags-$(CONFIG_DRM_TEGRA_DEBUG) += -DDEBUG
tegra-drm-y := \
drm.o \
+ uapi.o \
gem.o \
fb.o \
dp.o \
diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index cddee6425461..6ee08e49ec57 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -21,6 +21,7 @@
#include <drm/drm_prime.h>
#include <drm/drm_vblank.h>
+#include "uapi.h"
#include "drm.h"
#include "gem.h"
@@ -34,11 +35,6 @@
#define CARVEOUT_SZ SZ_64M
#define CDMA_GATHER_FETCHES_MAX_NB 16383
-struct tegra_drm_file {
- struct idr contexts;
- struct mutex lock;
-};
-
static int tegra_atomic_check(struct drm_device *drm,
struct drm_atomic_state *state)
{
@@ -94,7 +90,8 @@ static int tegra_drm_open(struct drm_device *drm, struct drm_file *filp)
if (!fpriv)
return -ENOMEM;
- idr_init_base(&fpriv->contexts, 1);
+ idr_init_base(&fpriv->legacy_contexts, 1);
+ xa_init_flags(&fpriv->contexts, XA_FLAGS_ALLOC1);
mutex_init(&fpriv->lock);
filp->driver_priv = fpriv;
@@ -419,7 +416,7 @@ static int tegra_client_open(struct tegra_drm_file *fpriv,
if (err < 0)
return err;
- err = idr_alloc(&fpriv->contexts, context, 1, 0, GFP_KERNEL);
+ err = idr_alloc(&fpriv->legacy_contexts, context, 1, 0, GFP_KERNEL);
if (err < 0) {
client->ops->close_channel(context);
return err;
@@ -474,13 +471,13 @@ static int tegra_close_channel(struct drm_device *drm, void *data,
mutex_lock(&fpriv->lock);
- context = idr_find(&fpriv->contexts, args->context);
+ context = idr_find(&fpriv->legacy_contexts, args->context);
if (!context) {
err = -EINVAL;
goto unlock;
}
- idr_remove(&fpriv->contexts, context->id);
+ idr_remove(&fpriv->legacy_contexts, context->id);
tegra_drm_context_free(context);
unlock:
@@ -499,7 +496,7 @@ static int tegra_get_syncpt(struct drm_device *drm, void *data,
mutex_lock(&fpriv->lock);
- context = idr_find(&fpriv->contexts, args->context);
+ context = idr_find(&fpriv->legacy_contexts, args->context);
if (!context) {
err = -ENODEV;
goto unlock;
@@ -528,7 +525,7 @@ static int tegra_submit(struct drm_device *drm, void *data,
mutex_lock(&fpriv->lock);
- context = idr_find(&fpriv->contexts, args->context);
+ context = idr_find(&fpriv->legacy_contexts, args->context);
if (!context) {
err = -ENODEV;
goto unlock;
@@ -553,7 +550,7 @@ static int tegra_get_syncpt_base(struct drm_device *drm, void *data,
mutex_lock(&fpriv->lock);
- context = idr_find(&fpriv->contexts, args->context);
+ context = idr_find(&fpriv->legacy_contexts, args->context);
if (!context) {
err = -ENODEV;
goto unlock;
@@ -722,10 +719,17 @@ static int tegra_gem_get_flags(struct drm_device *drm, void *data,
static const struct drm_ioctl_desc tegra_drm_ioctls[] = {
#ifdef CONFIG_DRM_TEGRA_STAGING
- DRM_IOCTL_DEF_DRV(TEGRA_GEM_CREATE, tegra_gem_create,
+ DRM_IOCTL_DEF_DRV(TEGRA_CHANNEL_OPEN, tegra_drm_ioctl_channel_open,
+ DRM_RENDER_ALLOW),
+ DRM_IOCTL_DEF_DRV(TEGRA_CHANNEL_CLOSE, tegra_drm_ioctl_channel_close,
DRM_RENDER_ALLOW),
- DRM_IOCTL_DEF_DRV(TEGRA_GEM_MMAP, tegra_gem_mmap,
+ DRM_IOCTL_DEF_DRV(TEGRA_CHANNEL_MAP, tegra_drm_ioctl_channel_map,
DRM_RENDER_ALLOW),
+ DRM_IOCTL_DEF_DRV(TEGRA_CHANNEL_UNMAP, tegra_drm_ioctl_channel_unmap,
+ DRM_RENDER_ALLOW),
+
+ DRM_IOCTL_DEF_DRV(TEGRA_GEM_CREATE, tegra_gem_create, DRM_RENDER_ALLOW),
+ DRM_IOCTL_DEF_DRV(TEGRA_GEM_MMAP, tegra_gem_mmap, DRM_RENDER_ALLOW),
DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_READ, tegra_syncpt_read,
DRM_RENDER_ALLOW),
DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_INCR, tegra_syncpt_incr,
@@ -779,10 +783,11 @@ static void tegra_drm_postclose(struct drm_device *drm, struct drm_file *file)
struct tegra_drm_file *fpriv = file->driver_priv;
mutex_lock(&fpriv->lock);
- idr_for_each(&fpriv->contexts, tegra_drm_context_cleanup, NULL);
+ idr_for_each(&fpriv->legacy_contexts, tegra_drm_context_cleanup, NULL);
+ tegra_drm_uapi_close_file(fpriv);
mutex_unlock(&fpriv->lock);
- idr_destroy(&fpriv->contexts);
+ idr_destroy(&fpriv->legacy_contexts);
mutex_destroy(&fpriv->lock);
kfree(fpriv);
}
diff --git a/drivers/gpu/drm/tegra/drm.h b/drivers/gpu/drm/tegra/drm.h
index 536861017d24..8b28327c931c 100644
--- a/drivers/gpu/drm/tegra/drm.h
+++ b/drivers/gpu/drm/tegra/drm.h
@@ -64,12 +64,22 @@ struct tegra_drm {
struct tegra_display_hub *hub;
};
+static inline struct host1x *tegra_drm_to_host1x(struct tegra_drm *tegra)
+{
+ return dev_get_drvdata(tegra->drm->dev->parent);
+}
+
struct tegra_drm_client;
struct tegra_drm_context {
struct tegra_drm_client *client;
struct host1x_channel *channel;
+
+ /* Only used by legacy UAPI. */
unsigned int id;
+
+ /* Only used by new UAPI. */
+ struct xarray mappings;
};
struct tegra_drm_client_ops {
diff --git a/drivers/gpu/drm/tegra/uapi.c b/drivers/gpu/drm/tegra/uapi.c
new file mode 100644
index 000000000000..48e872c768a9
--- /dev/null
+++ b/drivers/gpu/drm/tegra/uapi.c
@@ -0,0 +1,313 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (c) 2020 NVIDIA Corporation */
+
+#include <linux/host1x.h>
+#include <linux/iommu.h>
+#include <linux/list.h>
+
+#include <drm/drm_drv.h>
+#include <drm/drm_file.h>
+
+#include "drm.h"
+#include "uapi.h"
+
+static void tegra_drm_mapping_release(struct kref *ref)
+{
+ struct tegra_drm_mapping *mapping =
+ container_of(ref, struct tegra_drm_mapping, ref);
+
+ if (mapping->sgt)
+ dma_unmap_sgtable(mapping->dev, mapping->sgt,
+ mapping->direction, DMA_ATTR_SKIP_CPU_SYNC);
+
+ host1x_bo_unpin(mapping->dev, mapping->bo, mapping->sgt);
+ host1x_bo_put(mapping->bo);
+
+ kfree(mapping);
+}
+
+void tegra_drm_mapping_put(struct tegra_drm_mapping *mapping)
+{
+ kref_put(&mapping->ref, tegra_drm_mapping_release);
+}
+
+static void tegra_drm_channel_context_close(struct tegra_drm_context *context)
+{
+ struct tegra_drm_mapping *mapping;
+ unsigned long id;
+
+ xa_for_each(&context->mappings, id, mapping)
+ tegra_drm_mapping_put(mapping);
+
+ xa_destroy(&context->mappings);
+
+ host1x_channel_put(context->channel);
+
+ kfree(context);
+}
+
+void tegra_drm_uapi_close_file(struct tegra_drm_file *file)
+{
+ struct tegra_drm_context *context;
+ unsigned long id;
+
+ xa_for_each(&file->contexts, id, context)
+ tegra_drm_channel_context_close(context);
+
+ xa_destroy(&file->contexts);
+}
+
+static struct tegra_drm_client *tegra_drm_find_client(struct tegra_drm *tegra,
+ u32 class)
+{
+ struct tegra_drm_client *client;
+
+ list_for_each_entry(client, &tegra->clients, list)
+ if (client->base.class == class)
+ return client;
+
+ return NULL;
+}
+
+int tegra_drm_ioctl_channel_open(struct drm_device *drm, void *data,
+ struct drm_file *file)
+{
+ struct tegra_drm_file *fpriv = file->driver_priv;
+ struct tegra_drm *tegra = drm->dev_private;
+ struct drm_tegra_channel_open *args = data;
+ struct tegra_drm_client *client = NULL;
+ struct tegra_drm_context *context;
+ int err;
+
+ if (args->flags)
+ return -EINVAL;
+
+ context = kzalloc(sizeof(*context), GFP_KERNEL);
+ if (!context)
+ return -ENOMEM;
+
+ client = tegra_drm_find_client(tegra, args->host1x_class);
+ if (!client) {
+ err = -ENODEV;
+ goto free;
+ }
+
+ if (client->shared_channel) {
+ context->channel = host1x_channel_get(client->shared_channel);
+ } else {
+ context->channel = host1x_channel_request(&client->base);
+ if (!context->channel) {
+ err = -EBUSY;
+ goto free;
+ }
+ }
+
+ err = xa_alloc(&fpriv->contexts, &args->context, context,
+ XA_LIMIT(1, U32_MAX), GFP_KERNEL);
+ if (err < 0)
+ goto put_channel;
+
+ context->client = client;
+ xa_init_flags(&context->mappings, XA_FLAGS_ALLOC1);
+
+ args->version = client->version;
+ args->capabilities = 0;
+
+ if (device_get_dma_attr(client->base.dev) == DEV_DMA_COHERENT)
+ args->capabilities |= DRM_TEGRA_CHANNEL_CAP_CACHE_COHERENT;
+
+ return 0;
+
+put_channel:
+ host1x_channel_put(context->channel);
+free:
+ kfree(context);
+
+ return err;
+}
+
+int tegra_drm_ioctl_channel_close(struct drm_device *drm, void *data,
+ struct drm_file *file)
+{
+ struct tegra_drm_file *fpriv = file->driver_priv;
+ struct drm_tegra_channel_close *args = data;
+ struct tegra_drm_context *context;
+
+ mutex_lock(&fpriv->lock);
+
+ context = xa_load(&fpriv->contexts, args->context);
+ if (!context) {
+ mutex_unlock(&fpriv->lock);
+ return -EINVAL;
+ }
+
+ xa_erase(&fpriv->contexts, args->context);
+
+ mutex_unlock(&fpriv->lock);
+
+ tegra_drm_channel_context_close(context);
+
+ return 0;
+}
+
+int tegra_drm_ioctl_channel_map(struct drm_device *drm, void *data,
+ struct drm_file *file)
+{
+ struct tegra_drm_file *fpriv = file->driver_priv;
+ struct drm_tegra_channel_map *args = data;
+ struct tegra_drm_mapping *mapping;
+ struct tegra_drm_context *context;
+ int err = 0;
+
+ if (args->flags & ~DRM_TEGRA_CHANNEL_MAP_READ_WRITE)
+ return -EINVAL;
+
+ mutex_lock(&fpriv->lock);
+
+ context = xa_load(&fpriv->contexts, args->context);
+ if (!context) {
+ mutex_unlock(&fpriv->lock);
+ return -EINVAL;
+ }
+
+ mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
+ if (!mapping) {
+ err = -ENOMEM;
+ goto unlock;
+ }
+
+ kref_init(&mapping->ref);
+
+ mapping->dev = context->client->base.dev;
+ mapping->bo = tegra_gem_lookup(file, args->handle);
+ if (!mapping->bo) {
+ err = -EINVAL;
+ goto unlock;
+ }
+
+ if (context->client->base.group) {
+ /* IOMMU domain managed directly using IOMMU API */
+ host1x_bo_pin(mapping->dev, mapping->bo, &mapping->iova);
+ } else {
+ switch (args->flags & DRM_TEGRA_CHANNEL_MAP_READ_WRITE) {
+ case DRM_TEGRA_CHANNEL_MAP_READ_WRITE:
+ mapping->direction = DMA_BIDIRECTIONAL;
+ break;
+
+ case DRM_TEGRA_CHANNEL_MAP_WRITE:
+ mapping->direction = DMA_FROM_DEVICE;
+ break;
+
+ case DRM_TEGRA_CHANNEL_MAP_READ:
+ mapping->direction = DMA_TO_DEVICE;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ mapping->sgt = host1x_bo_pin(mapping->dev, mapping->bo, NULL);
+ if (IS_ERR(mapping->sgt)) {
+ err = PTR_ERR(mapping->sgt);
+ goto put_gem;
+ }
+
+ err = dma_map_sgtable(mapping->dev, mapping->sgt,
+ mapping->direction,
+ DMA_ATTR_SKIP_CPU_SYNC);
+ if (err)
+ goto unpin;
+
+ mapping->iova = sg_dma_address(mapping->sgt->sgl);
+ }
+
+ mapping->iova_end = mapping->iova + host1x_to_tegra_bo(mapping->bo)->size;
+
+ err = xa_alloc(&context->mappings, &args->mapping, mapping,
+ XA_LIMIT(1, U32_MAX), GFP_KERNEL);
+ if (err < 0)
+ goto unmap;
+
+ mutex_unlock(&fpriv->lock);
+
+ return 0;
+
+unmap:
+ if (mapping->sgt) {
+ dma_unmap_sgtable(mapping->dev, mapping->sgt,
+ mapping->direction, DMA_ATTR_SKIP_CPU_SYNC);
+ }
+unpin:
+ host1x_bo_unpin(mapping->dev, mapping->bo, mapping->sgt);
+put_gem:
+ host1x_bo_put(mapping->bo);
+ kfree(mapping);
+unlock:
+ mutex_unlock(&fpriv->lock);
+ return err;
+}
+
+int tegra_drm_ioctl_channel_unmap(struct drm_device *drm, void *data,
+ struct drm_file *file)
+{
+ struct tegra_drm_file *fpriv = file->driver_priv;
+ struct drm_tegra_channel_unmap *args = data;
+ struct tegra_drm_mapping *mapping;
+ struct tegra_drm_context *context;
+
+ mutex_lock(&fpriv->lock);
+
+ context = xa_load(&fpriv->contexts, args->context);
+ if (!context) {
+ mutex_unlock(&fpriv->lock);
+ return -EINVAL;
+ }
+
+ mapping = xa_erase(&context->mappings, args->mapping);
+
+ mutex_unlock(&fpriv->lock);
+
+ if (mapping) {
+ tegra_drm_mapping_put(mapping);
+ return 0;
+ } else {
+ return -EINVAL;
+ }
+}
+
+int tegra_drm_ioctl_gem_create(struct drm_device *drm, void *data,
+ struct drm_file *file)
+{
+ struct drm_tegra_gem_create *args = data;
+ struct tegra_bo *bo;
+
+ if (args->flags)
+ return -EINVAL;
+
+ bo = tegra_bo_create_with_handle(file, drm, args->size, args->flags,
+ &args->handle);
+ if (IS_ERR(bo))
+ return PTR_ERR(bo);
+
+ return 0;
+}
+
+int tegra_drm_ioctl_gem_mmap(struct drm_device *drm, void *data,
+ struct drm_file *file)
+{
+ struct drm_tegra_gem_mmap *args = data;
+ struct drm_gem_object *gem;
+ struct tegra_bo *bo;
+
+ gem = drm_gem_object_lookup(file, args->handle);
+ if (!gem)
+ return -EINVAL;
+
+ bo = to_tegra_bo(gem);
+
+ args->offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
+
+ drm_gem_object_put(gem);
+
+ return 0;
+}
diff --git a/drivers/gpu/drm/tegra/uapi.h b/drivers/gpu/drm/tegra/uapi.h
new file mode 100644
index 000000000000..fbef39726c29
--- /dev/null
+++ b/drivers/gpu/drm/tegra/uapi.h
@@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* Copyright (c) 2020 NVIDIA Corporation */
+
+#ifndef _TEGRA_DRM_UAPI_H
+#define _TEGRA_DRM_UAPI_H
+
+#include <linux/dma-mapping.h>
+#include <linux/idr.h>
+#include <linux/kref.h>
+#include <linux/xarray.h>
+
+#include <drm/drm.h>
+
+struct drm_file;
+struct drm_device;
+
+struct tegra_drm_file {
+ /* Legacy UAPI state */
+ struct idr legacy_contexts;
+ struct mutex lock;
+
+ /* New UAPI state */
+ struct xarray contexts;
+};
+
+struct tegra_drm_mapping {
+ struct kref ref;
+
+ struct device *dev;
+ struct host1x_bo *bo;
+ struct sg_table *sgt;
+ enum dma_data_direction direction;
+ dma_addr_t iova;
+ dma_addr_t iova_end;
+};
+
+int tegra_drm_ioctl_channel_open(struct drm_device *drm, void *data,
+ struct drm_file *file);
+int tegra_drm_ioctl_channel_close(struct drm_device *drm, void *data,
+ struct drm_file *file);
+int tegra_drm_ioctl_channel_map(struct drm_device *drm, void *data,
+ struct drm_file *file);
+int tegra_drm_ioctl_channel_unmap(struct drm_device *drm, void *data,
+ struct drm_file *file);
+int tegra_drm_ioctl_channel_submit(struct drm_device *drm, void *data,
+ struct drm_file *file);
+
+void tegra_drm_uapi_close_file(struct tegra_drm_file *file);
+void tegra_drm_mapping_put(struct tegra_drm_mapping *mapping);
+
+#endif
--
2.32.0
More information about the dri-devel
mailing list