// 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/drm_utils.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);
host1x_bo_unpin(mapping->map);
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;
if (context->memory_context)
host1x_memory_context_put(context->memory_context);
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;
struct host1x_syncpt *sp;
unsigned long id;
xa_for_each(&file->contexts, id, context)
tegra_drm_channel_context_close(context);
xa_for_each(&file->syncpoints, id, sp)
host1x_syncpt_put(sp);
xa_destroy(&file->contexts);
xa_destroy(&file->syncpoints);
}
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 host1x *host = tegra_drm_to_host1x(drm->dev_private);
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;
}
}
/* Only allocate context if the engine supports context isolation. */
if (device_iommu_mapped(client->base.dev) && client->ops->can_use_memory_ctx) {
bool supported;
err = client->ops->can_use_memory_ctx(client, &supported);
if (err)
goto put_channel;
if (supported)
context->memory_context = host1x_memory_context_alloc(
host, client->base.dev, get_task_pid(current, PIDTYPE_TGID));
if (IS_ERR(context->memory_context)) {
if (PTR_ERR(context->memory_context) != -EOPNOTSUPP) {
err = PTR_ERR(context->memory_context);
goto put_channel;
} else {
/*
* OK, HW does not support contexts or contexts
* are disabled.
*/
context->memory_context = NULL;
}
}
}
err = xa_alloc(&fpriv->contexts, &args->context, context, XA_LIMIT(1, U32_MAX),
GFP_KERNEL);
if (err < 0)
goto put_memctx;
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_memctx:
if (context->memory_context)
host1x_memory_context_put(context->memory_context);
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;
enum dma_data_direction direction;
struct device *mapping_dev;
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);
if (context->memory_context)
mapping_dev = &context->memory_context->dev;
else
mapping_dev = context->client->base.dev;
mapping->bo = tegra_gem_lookup(file, args->handle);
if (!mapping->bo) {
err = -EINVAL;
goto free;
}
switch (args->flags & DRM_TEGRA_CHANNEL_MAP_READ_WRITE) {
case DRM_TEGRA_CHANNEL_MAP_READ_WRITE:
direction = DMA_BIDIRECTIONAL;
break;
case DRM_TEGRA_CHANNEL_MAP_WRITE:
direction = DMA_FROM_DEVICE;
break;
case DRM_TEGRA_CHANNEL_MAP_READ:
direction = DMA_TO_DEVICE;
break;
default:
err = -EINVAL;
goto put_gem;
}
mapping->map = host1x_bo_pin(mapping_dev, mapping->bo, direction, NULL);
if (IS_ERR(mapping->map)) {
err = PTR_ERR(mapping->map);
goto put_gem;
}
mapping->iova = mapping->map->phys;
mapping->iova_end = mapping->iova + host1x_to_tegra_bo(mapping->bo)->gem.size;
err = xa_alloc(&context->mappings, &args->mapping, mapping, XA_LIMIT(1, U32_MAX),
GFP_KERNEL);
if (err < 0)
goto unpin;
mutex_unlock(&fpriv->lock);
return 0;
unpin:
host1x_bo_unpin(mapping->map);
put_gem:
host1x_bo_put(mapping->bo);
free:
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)
return -EINVAL;
tegra_drm_mapping_put(mapping);
return 0;
}
int tegra_drm_ioctl_syncpoint_allocate(struct drm_device *drm, void *data, struct drm_file *file)
{
struct host1x *host1x = tegra_drm_to_host1x(drm->dev_private);
struct tegra_drm_file *fpriv = file->driver_priv;
struct drm_tegra_syncpoint_allocate *args = data;
struct host1x_syncpt *sp;
int err;
if (args->id)
return -EINVAL;
sp = host1x_syncpt_alloc(host1x, HOST1X_SYNCPT_CLIENT_MANAGED, current->comm);
if (!sp)
return -EBUSY;
args->id = host1x_syncpt_id(sp);
err = xa_insert(&fpriv->syncpoints, args->id, sp, GFP_KERNEL);
if (err) {
host1x_syncpt_put(sp);
return err;
}
return 0;
}
int tegra_drm_ioctl_syncpoint_free(struct drm_device *drm, void *data, struct drm_file *file)
{
struct tegra_drm_file *fpriv = file->driver_priv;
struct drm_tegra_syncpoint_allocate *args = data;
struct host1x_syncpt *sp;
mutex_lock(&fpriv->lock);
sp = xa_erase(&fpriv->syncpoints, args->id);
mutex_unlock(&fpriv->lock);
if (!sp)
return -EINVAL;
host1x_syncpt_put(sp);
return 0;
}
int tegra_drm_ioctl_syncpoint_wait(struct drm_device *drm, void *data, struct drm_file *file)
{
struct host1x *host1x = tegra_drm_to_host1x(drm->dev_private);
struct drm_tegra_syncpoint_wait *args = data;
signed long timeout_jiffies;
struct host1x_syncpt *sp;
if (args->padding != 0)
return -EINVAL;
sp = host1x_syncpt_get_by_id_noref(host1x, args->id);
if (!sp)
return -EINVAL;
timeout_jiffies = drm_timeout_abs_to_jiffies(args->timeout_ns);
return host1x_syncpt_wait(sp, args->threshold, timeout_jiffies, &args->value);
}
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