360 lines
8.1 KiB
C
360 lines
8.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2020 NVIDIA Corporation */
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#include <linux/host1x.h>
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#include <linux/iommu.h>
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#include <linux/list.h>
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#include <drm/drm_drv.h>
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#include <drm/drm_file.h>
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#include <drm/drm_utils.h>
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#include "drm.h"
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#include "uapi.h"
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static void tegra_drm_mapping_release(struct kref *ref)
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{
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struct tegra_drm_mapping *mapping =
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container_of(ref, struct tegra_drm_mapping, ref);
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host1x_bo_unpin(mapping->map);
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host1x_bo_put(mapping->bo);
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kfree(mapping);
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}
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void tegra_drm_mapping_put(struct tegra_drm_mapping *mapping)
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{
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kref_put(&mapping->ref, tegra_drm_mapping_release);
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}
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static void tegra_drm_channel_context_close(struct tegra_drm_context *context)
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{
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struct tegra_drm_mapping *mapping;
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unsigned long id;
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if (context->memory_context)
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host1x_memory_context_put(context->memory_context);
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xa_for_each(&context->mappings, id, mapping)
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tegra_drm_mapping_put(mapping);
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xa_destroy(&context->mappings);
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host1x_channel_put(context->channel);
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kfree(context);
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}
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void tegra_drm_uapi_close_file(struct tegra_drm_file *file)
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{
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struct tegra_drm_context *context;
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struct host1x_syncpt *sp;
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unsigned long id;
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xa_for_each(&file->contexts, id, context)
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tegra_drm_channel_context_close(context);
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xa_for_each(&file->syncpoints, id, sp)
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host1x_syncpt_put(sp);
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xa_destroy(&file->contexts);
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xa_destroy(&file->syncpoints);
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}
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static struct tegra_drm_client *tegra_drm_find_client(struct tegra_drm *tegra, u32 class)
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{
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struct tegra_drm_client *client;
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list_for_each_entry(client, &tegra->clients, list)
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if (client->base.class == class)
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return client;
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return NULL;
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}
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int tegra_drm_ioctl_channel_open(struct drm_device *drm, void *data, struct drm_file *file)
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{
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struct host1x *host = tegra_drm_to_host1x(drm->dev_private);
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struct tegra_drm_file *fpriv = file->driver_priv;
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struct tegra_drm *tegra = drm->dev_private;
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struct drm_tegra_channel_open *args = data;
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struct tegra_drm_client *client = NULL;
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struct tegra_drm_context *context;
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int err;
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if (args->flags)
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return -EINVAL;
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context = kzalloc(sizeof(*context), GFP_KERNEL);
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if (!context)
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return -ENOMEM;
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client = tegra_drm_find_client(tegra, args->host1x_class);
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if (!client) {
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err = -ENODEV;
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goto free;
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}
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if (client->shared_channel) {
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context->channel = host1x_channel_get(client->shared_channel);
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} else {
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context->channel = host1x_channel_request(&client->base);
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if (!context->channel) {
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err = -EBUSY;
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goto free;
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}
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}
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/* Only allocate context if the engine supports context isolation. */
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if (device_iommu_mapped(client->base.dev) && client->ops->can_use_memory_ctx) {
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bool supported;
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err = client->ops->can_use_memory_ctx(client, &supported);
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if (err)
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goto put_channel;
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if (supported)
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context->memory_context = host1x_memory_context_alloc(
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host, get_task_pid(current, PIDTYPE_TGID));
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if (IS_ERR(context->memory_context)) {
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if (PTR_ERR(context->memory_context) != -EOPNOTSUPP) {
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err = PTR_ERR(context->memory_context);
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goto put_channel;
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} else {
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/*
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* OK, HW does not support contexts or contexts
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* are disabled.
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*/
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context->memory_context = NULL;
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}
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}
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}
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err = xa_alloc(&fpriv->contexts, &args->context, context, XA_LIMIT(1, U32_MAX),
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GFP_KERNEL);
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if (err < 0)
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goto put_memctx;
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context->client = client;
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xa_init_flags(&context->mappings, XA_FLAGS_ALLOC1);
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args->version = client->version;
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args->capabilities = 0;
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if (device_get_dma_attr(client->base.dev) == DEV_DMA_COHERENT)
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args->capabilities |= DRM_TEGRA_CHANNEL_CAP_CACHE_COHERENT;
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return 0;
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put_memctx:
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if (context->memory_context)
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host1x_memory_context_put(context->memory_context);
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put_channel:
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host1x_channel_put(context->channel);
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free:
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kfree(context);
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return err;
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}
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int tegra_drm_ioctl_channel_close(struct drm_device *drm, void *data, struct drm_file *file)
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{
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struct tegra_drm_file *fpriv = file->driver_priv;
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struct drm_tegra_channel_close *args = data;
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struct tegra_drm_context *context;
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mutex_lock(&fpriv->lock);
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context = xa_load(&fpriv->contexts, args->context);
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if (!context) {
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mutex_unlock(&fpriv->lock);
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return -EINVAL;
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}
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xa_erase(&fpriv->contexts, args->context);
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mutex_unlock(&fpriv->lock);
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tegra_drm_channel_context_close(context);
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return 0;
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}
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int tegra_drm_ioctl_channel_map(struct drm_device *drm, void *data, struct drm_file *file)
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{
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struct tegra_drm_file *fpriv = file->driver_priv;
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struct drm_tegra_channel_map *args = data;
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struct tegra_drm_mapping *mapping;
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struct tegra_drm_context *context;
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enum dma_data_direction direction;
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struct device *mapping_dev;
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int err = 0;
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if (args->flags & ~DRM_TEGRA_CHANNEL_MAP_READ_WRITE)
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return -EINVAL;
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mutex_lock(&fpriv->lock);
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context = xa_load(&fpriv->contexts, args->context);
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if (!context) {
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mutex_unlock(&fpriv->lock);
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return -EINVAL;
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}
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mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
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if (!mapping) {
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err = -ENOMEM;
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goto unlock;
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}
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kref_init(&mapping->ref);
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if (context->memory_context)
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mapping_dev = &context->memory_context->dev;
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else
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mapping_dev = context->client->base.dev;
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mapping->bo = tegra_gem_lookup(file, args->handle);
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if (!mapping->bo) {
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err = -EINVAL;
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goto free;
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}
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switch (args->flags & DRM_TEGRA_CHANNEL_MAP_READ_WRITE) {
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case DRM_TEGRA_CHANNEL_MAP_READ_WRITE:
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direction = DMA_BIDIRECTIONAL;
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break;
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case DRM_TEGRA_CHANNEL_MAP_WRITE:
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direction = DMA_FROM_DEVICE;
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break;
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case DRM_TEGRA_CHANNEL_MAP_READ:
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direction = DMA_TO_DEVICE;
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break;
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default:
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err = -EINVAL;
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goto put_gem;
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}
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mapping->map = host1x_bo_pin(mapping_dev, mapping->bo, direction, NULL);
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if (IS_ERR(mapping->map)) {
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err = PTR_ERR(mapping->map);
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goto put_gem;
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}
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mapping->iova = mapping->map->phys;
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mapping->iova_end = mapping->iova + host1x_to_tegra_bo(mapping->bo)->gem.size;
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err = xa_alloc(&context->mappings, &args->mapping, mapping, XA_LIMIT(1, U32_MAX),
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GFP_KERNEL);
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if (err < 0)
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goto unpin;
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mutex_unlock(&fpriv->lock);
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return 0;
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unpin:
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host1x_bo_unpin(mapping->map);
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put_gem:
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host1x_bo_put(mapping->bo);
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free:
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kfree(mapping);
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unlock:
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mutex_unlock(&fpriv->lock);
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return err;
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}
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int tegra_drm_ioctl_channel_unmap(struct drm_device *drm, void *data, struct drm_file *file)
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{
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struct tegra_drm_file *fpriv = file->driver_priv;
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struct drm_tegra_channel_unmap *args = data;
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struct tegra_drm_mapping *mapping;
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struct tegra_drm_context *context;
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mutex_lock(&fpriv->lock);
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context = xa_load(&fpriv->contexts, args->context);
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if (!context) {
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mutex_unlock(&fpriv->lock);
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return -EINVAL;
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}
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mapping = xa_erase(&context->mappings, args->mapping);
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mutex_unlock(&fpriv->lock);
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if (!mapping)
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return -EINVAL;
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tegra_drm_mapping_put(mapping);
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return 0;
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}
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int tegra_drm_ioctl_syncpoint_allocate(struct drm_device *drm, void *data, struct drm_file *file)
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{
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struct host1x *host1x = tegra_drm_to_host1x(drm->dev_private);
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struct tegra_drm_file *fpriv = file->driver_priv;
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struct drm_tegra_syncpoint_allocate *args = data;
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struct host1x_syncpt *sp;
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int err;
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if (args->id)
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return -EINVAL;
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sp = host1x_syncpt_alloc(host1x, HOST1X_SYNCPT_CLIENT_MANAGED, current->comm);
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if (!sp)
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return -EBUSY;
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args->id = host1x_syncpt_id(sp);
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err = xa_insert(&fpriv->syncpoints, args->id, sp, GFP_KERNEL);
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if (err) {
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host1x_syncpt_put(sp);
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return err;
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}
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return 0;
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}
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int tegra_drm_ioctl_syncpoint_free(struct drm_device *drm, void *data, struct drm_file *file)
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{
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struct tegra_drm_file *fpriv = file->driver_priv;
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struct drm_tegra_syncpoint_allocate *args = data;
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struct host1x_syncpt *sp;
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mutex_lock(&fpriv->lock);
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sp = xa_erase(&fpriv->syncpoints, args->id);
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mutex_unlock(&fpriv->lock);
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if (!sp)
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return -EINVAL;
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host1x_syncpt_put(sp);
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return 0;
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}
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int tegra_drm_ioctl_syncpoint_wait(struct drm_device *drm, void *data, struct drm_file *file)
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{
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struct host1x *host1x = tegra_drm_to_host1x(drm->dev_private);
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struct drm_tegra_syncpoint_wait *args = data;
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signed long timeout_jiffies;
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struct host1x_syncpt *sp;
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if (args->padding != 0)
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return -EINVAL;
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sp = host1x_syncpt_get_by_id_noref(host1x, args->id);
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if (!sp)
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return -EINVAL;
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timeout_jiffies = drm_timeout_abs_to_jiffies(args->timeout_ns);
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return host1x_syncpt_wait(sp, args->threshold, timeout_jiffies, &args->value);
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}
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