linux/drivers/gpu/drm/tegra/drm.c

1383 lines
32 KiB
C
Raw Normal View History

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2012 Avionic Design GmbH
* Copyright (C) 2012-2016 NVIDIA CORPORATION. All rights reserved.
*/
#include <linux/bitops.h>
#include <linux/host1x.h>
#include <linux/idr.h>
#include <linux/iommu.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_debugfs.h>
#include <drm/drm_drv.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_ioctl.h>
#include <drm/drm_prime.h>
#include <drm/drm_vblank.h>
#include "drm.h"
#include "gem.h"
#define DRIVER_NAME "tegra"
#define DRIVER_DESC "NVIDIA Tegra graphics"
#define DRIVER_DATE "20120330"
#define DRIVER_MAJOR 0
#define DRIVER_MINOR 0
#define DRIVER_PATCHLEVEL 0
#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)
{
int err;
err = drm_atomic_helper_check(drm, state);
if (err < 0)
return err;
return tegra_display_hub_atomic_check(drm, state);
}
static const struct drm_mode_config_funcs tegra_drm_mode_config_funcs = {
.fb_create = tegra_fb_create,
#ifdef CONFIG_DRM_FBDEV_EMULATION
.output_poll_changed = drm_fb_helper_output_poll_changed,
#endif
.atomic_check = tegra_atomic_check,
.atomic_commit = drm_atomic_helper_commit,
};
static void tegra_atomic_commit_tail(struct drm_atomic_state *old_state)
{
struct drm_device *drm = old_state->dev;
struct tegra_drm *tegra = drm->dev_private;
if (tegra->hub) {
drm_atomic_helper_commit_modeset_disables(drm, old_state);
tegra_display_hub_atomic_commit(drm, old_state);
drm_atomic_helper_commit_planes(drm, old_state, 0);
drm_atomic_helper_commit_modeset_enables(drm, old_state);
drm_atomic_helper_commit_hw_done(old_state);
drm_atomic_helper_wait_for_vblanks(drm, old_state);
drm_atomic_helper_cleanup_planes(drm, old_state);
} else {
drm_atomic_helper_commit_tail_rpm(old_state);
}
}
static const struct drm_mode_config_helper_funcs
tegra_drm_mode_config_helpers = {
.atomic_commit_tail = tegra_atomic_commit_tail,
};
static int tegra_drm_open(struct drm_device *drm, struct drm_file *filp)
{
struct tegra_drm_file *fpriv;
fpriv = kzalloc(sizeof(*fpriv), GFP_KERNEL);
if (!fpriv)
return -ENOMEM;
idr_init_base(&fpriv->contexts, 1);
mutex_init(&fpriv->lock);
filp->driver_priv = fpriv;
return 0;
}
static void tegra_drm_context_free(struct tegra_drm_context *context)
{
context->client->ops->close_channel(context);
kfree(context);
}
static struct host1x_bo *
host1x_bo_lookup(struct drm_file *file, u32 handle)
{
struct drm_gem_object *gem;
struct tegra_bo *bo;
gem = drm_gem_object_lookup(file, handle);
if (!gem)
return NULL;
bo = to_tegra_bo(gem);
return &bo->base;
}
static int host1x_reloc_copy_from_user(struct host1x_reloc *dest,
struct drm_tegra_reloc __user *src,
struct drm_device *drm,
struct drm_file *file)
{
u32 cmdbuf, target;
int err;
err = get_user(cmdbuf, &src->cmdbuf.handle);
if (err < 0)
return err;
err = get_user(dest->cmdbuf.offset, &src->cmdbuf.offset);
if (err < 0)
return err;
err = get_user(target, &src->target.handle);
if (err < 0)
return err;
err = get_user(dest->target.offset, &src->target.offset);
if (err < 0)
return err;
err = get_user(dest->shift, &src->shift);
if (err < 0)
return err;
dest->flags = HOST1X_RELOC_READ | HOST1X_RELOC_WRITE;
dest->cmdbuf.bo = host1x_bo_lookup(file, cmdbuf);
if (!dest->cmdbuf.bo)
return -ENOENT;
dest->target.bo = host1x_bo_lookup(file, target);
if (!dest->target.bo)
return -ENOENT;
return 0;
}
int tegra_drm_submit(struct tegra_drm_context *context,
struct drm_tegra_submit *args, struct drm_device *drm,
struct drm_file *file)
{
struct host1x_client *client = &context->client->base;
unsigned int num_cmdbufs = args->num_cmdbufs;
unsigned int num_relocs = args->num_relocs;
struct drm_tegra_cmdbuf __user *user_cmdbufs;
struct drm_tegra_reloc __user *user_relocs;
struct drm_tegra_syncpt __user *user_syncpt;
struct drm_tegra_syncpt syncpt;
struct host1x *host1x = dev_get_drvdata(drm->dev->parent);
struct drm_gem_object **refs;
struct host1x_syncpt *sp;
struct host1x_job *job;
unsigned int num_refs;
int err;
user_cmdbufs = u64_to_user_ptr(args->cmdbufs);
user_relocs = u64_to_user_ptr(args->relocs);
user_syncpt = u64_to_user_ptr(args->syncpts);
/* We don't yet support other than one syncpt_incr struct per submit */
if (args->num_syncpts != 1)
return -EINVAL;
/* We don't yet support waitchks */
if (args->num_waitchks != 0)
return -EINVAL;
job = host1x_job_alloc(context->channel, args->num_cmdbufs,
args->num_relocs);
if (!job)
return -ENOMEM;
job->num_relocs = args->num_relocs;
job->client = client;
job->class = client->class;
job->serialize = true;
/*
* Track referenced BOs so that they can be unreferenced after the
* submission is complete.
*/
num_refs = num_cmdbufs + num_relocs * 2;
refs = kmalloc_array(num_refs, sizeof(*refs), GFP_KERNEL);
if (!refs) {
err = -ENOMEM;
goto put;
}
/* reuse as an iterator later */
num_refs = 0;
while (num_cmdbufs) {
struct drm_tegra_cmdbuf cmdbuf;
struct host1x_bo *bo;
struct tegra_bo *obj;
u64 offset;
if (copy_from_user(&cmdbuf, user_cmdbufs, sizeof(cmdbuf))) {
err = -EFAULT;
goto fail;
}
/*
* The maximum number of CDMA gather fetches is 16383, a higher
* value means the words count is malformed.
*/
if (cmdbuf.words > CDMA_GATHER_FETCHES_MAX_NB) {
err = -EINVAL;
goto fail;
}
bo = host1x_bo_lookup(file, cmdbuf.handle);
if (!bo) {
err = -ENOENT;
goto fail;
}
offset = (u64)cmdbuf.offset + (u64)cmdbuf.words * sizeof(u32);
obj = host1x_to_tegra_bo(bo);
refs[num_refs++] = &obj->gem;
/*
* Gather buffer base address must be 4-bytes aligned,
* unaligned offset is malformed and cause commands stream
* corruption on the buffer address relocation.
*/
if (offset & 3 || offset > obj->gem.size) {
err = -EINVAL;
goto fail;
}
host1x_job_add_gather(job, bo, cmdbuf.words, cmdbuf.offset);
num_cmdbufs--;
user_cmdbufs++;
}
/* copy and resolve relocations from submit */
while (num_relocs--) {
struct host1x_reloc *reloc;
struct tegra_bo *obj;
err = host1x_reloc_copy_from_user(&job->relocs[num_relocs],
&user_relocs[num_relocs], drm,
file);
if (err < 0)
goto fail;
reloc = &job->relocs[num_relocs];
obj = host1x_to_tegra_bo(reloc->cmdbuf.bo);
refs[num_refs++] = &obj->gem;
/*
* The unaligned cmdbuf offset will cause an unaligned write
* during of the relocations patching, corrupting the commands
* stream.
*/
if (reloc->cmdbuf.offset & 3 ||
reloc->cmdbuf.offset >= obj->gem.size) {
err = -EINVAL;
goto fail;
}
obj = host1x_to_tegra_bo(reloc->target.bo);
refs[num_refs++] = &obj->gem;
if (reloc->target.offset >= obj->gem.size) {
err = -EINVAL;
goto fail;
}
}
if (copy_from_user(&syncpt, user_syncpt, sizeof(syncpt))) {
err = -EFAULT;
goto fail;
}
/* check whether syncpoint ID is valid */
sp = host1x_syncpt_get(host1x, syncpt.id);
if (!sp) {
err = -ENOENT;
goto fail;
}
job->is_addr_reg = context->client->ops->is_addr_reg;
job->is_valid_class = context->client->ops->is_valid_class;
job->syncpt_incrs = syncpt.incrs;
job->syncpt_id = syncpt.id;
job->timeout = 10000;
if (args->timeout && args->timeout < 10000)
job->timeout = args->timeout;
err = host1x_job_pin(job, context->client->base.dev);
if (err)
goto fail;
err = host1x_job_submit(job);
if (err) {
host1x_job_unpin(job);
goto fail;
}
args->fence = job->syncpt_end;
fail:
while (num_refs--)
drm_gem_object_put(refs[num_refs]);
kfree(refs);
put:
host1x_job_put(job);
return err;
}
#ifdef CONFIG_DRM_TEGRA_STAGING
static int tegra_gem_create(struct drm_device *drm, void *data,
struct drm_file *file)
{
struct drm_tegra_gem_create *args = data;
struct tegra_bo *bo;
bo = tegra_bo_create_with_handle(file, drm, args->size, args->flags,
&args->handle);
if (IS_ERR(bo))
return PTR_ERR(bo);
return 0;
}
static int tegra_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;
}
static int tegra_syncpt_read(struct drm_device *drm, void *data,
struct drm_file *file)
{
struct host1x *host = dev_get_drvdata(drm->dev->parent);
struct drm_tegra_syncpt_read *args = data;
struct host1x_syncpt *sp;
sp = host1x_syncpt_get(host, args->id);
if (!sp)
return -EINVAL;
args->value = host1x_syncpt_read_min(sp);
return 0;
}
static int tegra_syncpt_incr(struct drm_device *drm, void *data,
struct drm_file *file)
{
struct host1x *host1x = dev_get_drvdata(drm->dev->parent);
struct drm_tegra_syncpt_incr *args = data;
struct host1x_syncpt *sp;
sp = host1x_syncpt_get(host1x, args->id);
if (!sp)
return -EINVAL;
return host1x_syncpt_incr(sp);
}
static int tegra_syncpt_wait(struct drm_device *drm, void *data,
struct drm_file *file)
{
struct host1x *host1x = dev_get_drvdata(drm->dev->parent);
struct drm_tegra_syncpt_wait *args = data;
struct host1x_syncpt *sp;
sp = host1x_syncpt_get(host1x, args->id);
if (!sp)
return -EINVAL;
return host1x_syncpt_wait(sp, args->thresh,
msecs_to_jiffies(args->timeout),
&args->value);
}
static int tegra_client_open(struct tegra_drm_file *fpriv,
struct tegra_drm_client *client,
struct tegra_drm_context *context)
{
int err;
err = client->ops->open_channel(client, context);
if (err < 0)
return err;
err = idr_alloc(&fpriv->contexts, context, 1, 0, GFP_KERNEL);
if (err < 0) {
client->ops->close_channel(context);
return err;
}
context->client = client;
context->id = err;
return 0;
}
static int tegra_open_channel(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_open_channel *args = data;
struct tegra_drm_context *context;
struct tegra_drm_client *client;
int err = -ENODEV;
context = kzalloc(sizeof(*context), GFP_KERNEL);
if (!context)
return -ENOMEM;
mutex_lock(&fpriv->lock);
list_for_each_entry(client, &tegra->clients, list)
if (client->base.class == args->client) {
err = tegra_client_open(fpriv, client, context);
if (err < 0)
break;
args->context = context->id;
break;
}
if (err < 0)
kfree(context);
mutex_unlock(&fpriv->lock);
return err;
}
static int tegra_close_channel(struct drm_device *drm, void *data,
struct drm_file *file)
{
struct tegra_drm_file *fpriv = file->driver_priv;
struct drm_tegra_close_channel *args = data;
struct tegra_drm_context *context;
int err = 0;
mutex_lock(&fpriv->lock);
context = idr_find(&fpriv->contexts, args->context);
if (!context) {
err = -EINVAL;
goto unlock;
}
idr_remove(&fpriv->contexts, context->id);
tegra_drm_context_free(context);
unlock:
mutex_unlock(&fpriv->lock);
return err;
}
static int tegra_get_syncpt(struct drm_device *drm, void *data,
struct drm_file *file)
{
struct tegra_drm_file *fpriv = file->driver_priv;
struct drm_tegra_get_syncpt *args = data;
struct tegra_drm_context *context;
struct host1x_syncpt *syncpt;
int err = 0;
mutex_lock(&fpriv->lock);
context = idr_find(&fpriv->contexts, args->context);
if (!context) {
err = -ENODEV;
goto unlock;
}
if (args->index >= context->client->base.num_syncpts) {
err = -EINVAL;
goto unlock;
}
syncpt = context->client->base.syncpts[args->index];
args->id = host1x_syncpt_id(syncpt);
unlock:
mutex_unlock(&fpriv->lock);
return err;
}
static int tegra_submit(struct drm_device *drm, void *data,
struct drm_file *file)
{
struct tegra_drm_file *fpriv = file->driver_priv;
struct drm_tegra_submit *args = data;
struct tegra_drm_context *context;
int err;
mutex_lock(&fpriv->lock);
context = idr_find(&fpriv->contexts, args->context);
if (!context) {
err = -ENODEV;
goto unlock;
}
err = context->client->ops->submit(context, args, drm, file);
unlock:
mutex_unlock(&fpriv->lock);
return err;
}
static int tegra_get_syncpt_base(struct drm_device *drm, void *data,
struct drm_file *file)
{
struct tegra_drm_file *fpriv = file->driver_priv;
struct drm_tegra_get_syncpt_base *args = data;
struct tegra_drm_context *context;
struct host1x_syncpt_base *base;
struct host1x_syncpt *syncpt;
int err = 0;
mutex_lock(&fpriv->lock);
context = idr_find(&fpriv->contexts, args->context);
if (!context) {
err = -ENODEV;
goto unlock;
}
if (args->syncpt >= context->client->base.num_syncpts) {
err = -EINVAL;
goto unlock;
}
syncpt = context->client->base.syncpts[args->syncpt];
base = host1x_syncpt_get_base(syncpt);
if (!base) {
err = -ENXIO;
goto unlock;
}
args->id = host1x_syncpt_base_id(base);
unlock:
mutex_unlock(&fpriv->lock);
return err;
}
static int tegra_gem_set_tiling(struct drm_device *drm, void *data,
struct drm_file *file)
{
struct drm_tegra_gem_set_tiling *args = data;
enum tegra_bo_tiling_mode mode;
struct drm_gem_object *gem;
unsigned long value = 0;
struct tegra_bo *bo;
switch (args->mode) {
case DRM_TEGRA_GEM_TILING_MODE_PITCH:
mode = TEGRA_BO_TILING_MODE_PITCH;
if (args->value != 0)
return -EINVAL;
break;
case DRM_TEGRA_GEM_TILING_MODE_TILED:
mode = TEGRA_BO_TILING_MODE_TILED;
if (args->value != 0)
return -EINVAL;
break;
case DRM_TEGRA_GEM_TILING_MODE_BLOCK:
mode = TEGRA_BO_TILING_MODE_BLOCK;
if (args->value > 5)
return -EINVAL;
value = args->value;
break;
default:
return -EINVAL;
}
gem = drm_gem_object_lookup(file, args->handle);
if (!gem)
return -ENOENT;
bo = to_tegra_bo(gem);
bo->tiling.mode = mode;
bo->tiling.value = value;
drm_gem_object_put(gem);
return 0;
}
static int tegra_gem_get_tiling(struct drm_device *drm, void *data,
struct drm_file *file)
{
struct drm_tegra_gem_get_tiling *args = data;
struct drm_gem_object *gem;
struct tegra_bo *bo;
int err = 0;
gem = drm_gem_object_lookup(file, args->handle);
if (!gem)
return -ENOENT;
bo = to_tegra_bo(gem);
switch (bo->tiling.mode) {
case TEGRA_BO_TILING_MODE_PITCH:
args->mode = DRM_TEGRA_GEM_TILING_MODE_PITCH;
args->value = 0;
break;
case TEGRA_BO_TILING_MODE_TILED:
args->mode = DRM_TEGRA_GEM_TILING_MODE_TILED;
args->value = 0;
break;
case TEGRA_BO_TILING_MODE_BLOCK:
args->mode = DRM_TEGRA_GEM_TILING_MODE_BLOCK;
args->value = bo->tiling.value;
break;
default:
err = -EINVAL;
break;
}
drm_gem_object_put(gem);
return err;
}
static int tegra_gem_set_flags(struct drm_device *drm, void *data,
struct drm_file *file)
{
struct drm_tegra_gem_set_flags *args = data;
struct drm_gem_object *gem;
struct tegra_bo *bo;
if (args->flags & ~DRM_TEGRA_GEM_FLAGS)
return -EINVAL;
gem = drm_gem_object_lookup(file, args->handle);
if (!gem)
return -ENOENT;
bo = to_tegra_bo(gem);
bo->flags = 0;
if (args->flags & DRM_TEGRA_GEM_BOTTOM_UP)
bo->flags |= TEGRA_BO_BOTTOM_UP;
drm_gem_object_put(gem);
return 0;
}
static int tegra_gem_get_flags(struct drm_device *drm, void *data,
struct drm_file *file)
{
struct drm_tegra_gem_get_flags *args = data;
struct drm_gem_object *gem;
struct tegra_bo *bo;
gem = drm_gem_object_lookup(file, args->handle);
if (!gem)
return -ENOENT;
bo = to_tegra_bo(gem);
args->flags = 0;
if (bo->flags & TEGRA_BO_BOTTOM_UP)
args->flags |= DRM_TEGRA_GEM_BOTTOM_UP;
drm_gem_object_put(gem);
return 0;
}
#endif
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_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,
DRM_RENDER_ALLOW),
DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_WAIT, tegra_syncpt_wait,
DRM_RENDER_ALLOW),
DRM_IOCTL_DEF_DRV(TEGRA_OPEN_CHANNEL, tegra_open_channel,
DRM_RENDER_ALLOW),
DRM_IOCTL_DEF_DRV(TEGRA_CLOSE_CHANNEL, tegra_close_channel,
DRM_RENDER_ALLOW),
DRM_IOCTL_DEF_DRV(TEGRA_GET_SYNCPT, tegra_get_syncpt,
DRM_RENDER_ALLOW),
DRM_IOCTL_DEF_DRV(TEGRA_SUBMIT, tegra_submit,
DRM_RENDER_ALLOW),
DRM_IOCTL_DEF_DRV(TEGRA_GET_SYNCPT_BASE, tegra_get_syncpt_base,
DRM_RENDER_ALLOW),
DRM_IOCTL_DEF_DRV(TEGRA_GEM_SET_TILING, tegra_gem_set_tiling,
DRM_RENDER_ALLOW),
DRM_IOCTL_DEF_DRV(TEGRA_GEM_GET_TILING, tegra_gem_get_tiling,
DRM_RENDER_ALLOW),
DRM_IOCTL_DEF_DRV(TEGRA_GEM_SET_FLAGS, tegra_gem_set_flags,
DRM_RENDER_ALLOW),
DRM_IOCTL_DEF_DRV(TEGRA_GEM_GET_FLAGS, tegra_gem_get_flags,
DRM_RENDER_ALLOW),
#endif
};
static const struct file_operations tegra_drm_fops = {
.owner = THIS_MODULE,
.open = drm_open,
.release = drm_release,
.unlocked_ioctl = drm_ioctl,
.mmap = tegra_drm_mmap,
.poll = drm_poll,
.read = drm_read,
.compat_ioctl = drm_compat_ioctl,
.llseek = noop_llseek,
};
static int tegra_drm_context_cleanup(int id, void *p, void *data)
{
struct tegra_drm_context *context = p;
tegra_drm_context_free(context);
return 0;
}
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);
mutex_unlock(&fpriv->lock);
idr_destroy(&fpriv->contexts);
mutex_destroy(&fpriv->lock);
kfree(fpriv);
}
#ifdef CONFIG_DEBUG_FS
static int tegra_debugfs_framebuffers(struct seq_file *s, void *data)
{
struct drm_info_node *node = (struct drm_info_node *)s->private;
struct drm_device *drm = node->minor->dev;
struct drm_framebuffer *fb;
mutex_lock(&drm->mode_config.fb_lock);
list_for_each_entry(fb, &drm->mode_config.fb_list, head) {
seq_printf(s, "%3d: user size: %d x %d, depth %d, %d bpp, refcount %d\n",
fb->base.id, fb->width, fb->height,
fb->format->depth,
drm: Nuke fb->bits_per_pixel Replace uses of fb->bits_per_pixel with fb->format->cpp[0]*8. Less duplicated information is a good thing. Note that I didn't put parens around the cpp*8 in the below cocci script, on account of not wanting spurious parens all over the place. Instead I did the unsafe way, and tried to look over the entire diff to spot if any dangerous expressions were produced. I didn't see any. There are some cases where previously the code did X*bpp/8, so the division happened after the multiplication. Those are now just X*cpp so the division effectively happens before the multiplication, but that is perfectly fine since bpp is always a multiple of 8. @@ struct drm_framebuffer *FB; expression E; @@ drm_helper_mode_fill_fb_struct(...) { ... - FB->bits_per_pixel = E; ... } @@ struct drm_framebuffer *FB; expression E; @@ i9xx_get_initial_plane_config(...) { ... - FB->bits_per_pixel = E; ... } @@ struct drm_framebuffer *FB; expression E; @@ ironlake_get_initial_plane_config(...) { ... - FB->bits_per_pixel = E; ... } @@ struct drm_framebuffer *FB; expression E; @@ skylake_get_initial_plane_config(...) { ... - FB->bits_per_pixel = E; ... } @@ struct drm_framebuffer FB; expression E; @@ ( - E * FB.bits_per_pixel / 8 + E * FB.format->cpp[0] | - FB.bits_per_pixel / 8 + FB.format->cpp[0] | - E * FB.bits_per_pixel >> 3 + E * FB.format->cpp[0] | - FB.bits_per_pixel >> 3 + FB.format->cpp[0] | - (FB.bits_per_pixel + 7) / 8 + FB.format->cpp[0] | - FB.bits_per_pixel + FB.format->cpp[0] * 8 | - FB.format->cpp[0] * 8 != 8 + FB.format->cpp[0] != 1 ) @@ struct drm_framebuffer *FB; expression E; @@ ( - E * FB->bits_per_pixel / 8 + E * FB->format->cpp[0] | - FB->bits_per_pixel / 8 + FB->format->cpp[0] | - E * FB->bits_per_pixel >> 3 + E * FB->format->cpp[0] | - FB->bits_per_pixel >> 3 + FB->format->cpp[0] | - (FB->bits_per_pixel + 7) / 8 + FB->format->cpp[0] | - FB->bits_per_pixel + FB->format->cpp[0] * 8 | - FB->format->cpp[0] * 8 != 8 + FB->format->cpp[0] != 1 ) @@ struct drm_plane_state *state; expression E; @@ ( - E * state->fb->bits_per_pixel / 8 + E * state->fb->format->cpp[0] | - state->fb->bits_per_pixel / 8 + state->fb->format->cpp[0] | - E * state->fb->bits_per_pixel >> 3 + E * state->fb->format->cpp[0] | - state->fb->bits_per_pixel >> 3 + state->fb->format->cpp[0] | - (state->fb->bits_per_pixel + 7) / 8 + state->fb->format->cpp[0] | - state->fb->bits_per_pixel + state->fb->format->cpp[0] * 8 | - state->fb->format->cpp[0] * 8 != 8 + state->fb->format->cpp[0] != 1 ) @@ @@ - (8 * 8) + 8 * 8 @@ struct drm_framebuffer FB; @@ - (FB.format->cpp[0]) + FB.format->cpp[0] @@ struct drm_framebuffer *FB; @@ - (FB->format->cpp[0]) + FB->format->cpp[0] @@ @@ struct drm_framebuffer { ... - int bits_per_pixel; ... }; v2: Clean up the 'cpp*8 != 8' and '(8 * 8)' cases (Laurent) v3: Adjusted the semantic patch a bit and regenerated due to code changes Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> (v1) Link: http://patchwork.freedesktop.org/patch/msgid/1481751140-18352-1-git-send-email-ville.syrjala@linux.intel.com
2016-12-15 05:32:20 +08:00
fb->format->cpp[0] * 8,
drm_framebuffer_read_refcount(fb));
}
mutex_unlock(&drm->mode_config.fb_lock);
return 0;
}
static int tegra_debugfs_iova(struct seq_file *s, void *data)
{
struct drm_info_node *node = (struct drm_info_node *)s->private;
struct drm_device *drm = node->minor->dev;
struct tegra_drm *tegra = drm->dev_private;
struct drm_printer p = drm_seq_file_printer(s);
if (tegra->domain) {
mutex_lock(&tegra->mm_lock);
drm_mm_print(&tegra->mm, &p);
mutex_unlock(&tegra->mm_lock);
}
return 0;
}
static struct drm_info_list tegra_debugfs_list[] = {
{ "framebuffers", tegra_debugfs_framebuffers, 0 },
{ "iova", tegra_debugfs_iova, 0 },
};
static void tegra_debugfs_init(struct drm_minor *minor)
{
drm_debugfs_create_files(tegra_debugfs_list,
ARRAY_SIZE(tegra_debugfs_list),
minor->debugfs_root, minor);
}
#endif
drm/<drivers>: Constify struct drm_driver Only the following drivers aren't converted: - amdgpu, because of the driver_feature mangling due to virt support. Subsequent patch will address this. - nouveau, because DRIVER_ATOMIC uapi is still not the default on the platforms where it's supported (i.e. again driver_feature mangling) - vc4, again because of driver_feature mangling - qxl, because the ioctl table is somewhere else and moving that is maybe a bit too much, hence the num_ioctls assignment prevents a const driver structure. - arcpgu, because that is stuck behind a pending tiny-fication series from me. - legacy drivers, because legacy requires non-const drm_driver. Note that for armada I also went ahead and made the ioctl array const. Only cc'ing the driver people who've not been converted (everyone else is way too much). v2: Fix one misplaced const static, should be static const (0day) v3: - Improve commit message (Sam) Acked-by: Sam Ravnborg <sam@ravnborg.org> Cc: kernel test robot <lkp@intel.com> Acked-by: Maxime Ripard <mripard@kernel.org> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Dave Airlie <airlied@redhat.com> Cc: Gerd Hoffmann <kraxel@redhat.com> Cc: virtualization@lists.linux-foundation.org Cc: Harry Wentland <harry.wentland@amd.com> Cc: Leo Li <sunpeng.li@amd.com> Cc: Alex Deucher <alexander.deucher@amd.com> Cc: Christian König <christian.koenig@amd.com> Cc: Eric Anholt <eric@anholt.net> Cc: Maxime Ripard <mripard@kernel.org> Cc: Ben Skeggs <bskeggs@redhat.com> Cc: nouveau@lists.freedesktop.org Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20201104100425.1922351-5-daniel.vetter@ffwll.ch
2020-11-04 18:04:24 +08:00
static const struct drm_driver tegra_drm_driver = {
drm/prime: Actually remove DRIVER_PRIME everywhere Split out to make the functional changes stick out more. All places where DRIVER_PRIME was used have been removed in previous patches already. v2: amdgpu gained DRIVER_SYNCOBJ_TIMELINE. v3: amdgpu lost DRIVER_SYNCOBJ_TIMELINE. v4: Don't add a space in i915_drv.c (Sam) v5: Add note that previous patches removed all the DRIVER_PRIME users already (Emil). v6: Fixupe ingenic (new driver) while applying. Cc: Sam Ravnborg <sam@ravnborg.org> Reviewed-by: Emil Velikov <emil.velikov@collabora.com> Reviewed-by: Eric Anholt <eric@anholt.net> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Cc: amd-gfx@lists.freedesktop.org Cc: etnaviv@lists.freedesktop.org Cc: freedreno@lists.freedesktop.org Cc: intel-gfx@lists.freedesktop.org Cc: lima@lists.freedesktop.org Cc: linux-amlogic@lists.infradead.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-arm-msm@vger.kernel.org Cc: linux-aspeed@lists.ozlabs.org Cc: linux-renesas-soc@vger.kernel.org Cc: linux-rockchip@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-stm32@st-md-mailman.stormreply.com Cc: linux-tegra@vger.kernel.org Cc: nouveau@lists.freedesktop.org Cc: NXP Linux Team <linux-imx@nxp.com> Cc: spice-devel@lists.freedesktop.org Cc: virtualization@lists.linux-foundation.org Cc: VMware Graphics <linux-graphics-maintainer@vmware.com> Cc: xen-devel@lists.xenproject.org Link: https://patchwork.freedesktop.org/patch/msgid/20190617153924.414-1-daniel.vetter@ffwll.ch
2019-06-17 23:39:24 +08:00
.driver_features = DRIVER_MODESET | DRIVER_GEM |
DRIVER_ATOMIC | DRIVER_RENDER,
.open = tegra_drm_open,
.postclose = tegra_drm_postclose,
.lastclose = drm_fb_helper_lastclose,
#if defined(CONFIG_DEBUG_FS)
.debugfs_init = tegra_debugfs_init,
#endif
.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
.gem_prime_import = tegra_gem_prime_import,
.dumb_create = tegra_bo_dumb_create,
.ioctls = tegra_drm_ioctls,
.num_ioctls = ARRAY_SIZE(tegra_drm_ioctls),
.fops = &tegra_drm_fops,
.name = DRIVER_NAME,
.desc = DRIVER_DESC,
.date = DRIVER_DATE,
.major = DRIVER_MAJOR,
.minor = DRIVER_MINOR,
.patchlevel = DRIVER_PATCHLEVEL,
};
int tegra_drm_register_client(struct tegra_drm *tegra,
struct tegra_drm_client *client)
{
mutex_lock(&tegra->clients_lock);
list_add_tail(&client->list, &tegra->clients);
client->drm = tegra;
mutex_unlock(&tegra->clients_lock);
return 0;
}
int tegra_drm_unregister_client(struct tegra_drm *tegra,
struct tegra_drm_client *client)
{
mutex_lock(&tegra->clients_lock);
list_del_init(&client->list);
client->drm = NULL;
mutex_unlock(&tegra->clients_lock);
return 0;
}
int host1x_client_iommu_attach(struct host1x_client *client)
{
struct iommu_domain *domain = iommu_get_domain_for_dev(client->dev);
struct drm_device *drm = dev_get_drvdata(client->host);
struct tegra_drm *tegra = drm->dev_private;
struct iommu_group *group = NULL;
int err;
/*
* If the host1x client is already attached to an IOMMU domain that is
* not the shared IOMMU domain, don't try to attach it to a different
* domain. This allows using the IOMMU-backed DMA API.
*/
if (domain && domain != tegra->domain)
return 0;
if (tegra->domain) {
group = iommu_group_get(client->dev);
if (!group)
return -ENODEV;
if (domain != tegra->domain) {
err = iommu_attach_group(tegra->domain, group);
if (err < 0) {
iommu_group_put(group);
return err;
}
}
tegra->use_explicit_iommu = true;
}
client->group = group;
return 0;
}
void host1x_client_iommu_detach(struct host1x_client *client)
{
struct drm_device *drm = dev_get_drvdata(client->host);
struct tegra_drm *tegra = drm->dev_private;
struct iommu_domain *domain;
if (client->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);
iommu_group_put(client->group);
client->group = NULL;
}
}
void *tegra_drm_alloc(struct tegra_drm *tegra, size_t size, dma_addr_t *dma)
{
struct iova *alloc;
void *virt;
gfp_t gfp;
int err;
if (tegra->domain)
size = iova_align(&tegra->carveout.domain, size);
else
size = PAGE_ALIGN(size);
gfp = GFP_KERNEL | __GFP_ZERO;
if (!tegra->domain) {
/*
* Many units only support 32-bit addresses, even on 64-bit
* SoCs. If there is no IOMMU to translate into a 32-bit IO
* virtual address space, force allocations to be in the
* lower 32-bit range.
*/
gfp |= GFP_DMA;
}
virt = (void *)__get_free_pages(gfp, get_order(size));
if (!virt)
return ERR_PTR(-ENOMEM);
if (!tegra->domain) {
/*
* If IOMMU is disabled, devices address physical memory
* directly.
*/
*dma = virt_to_phys(virt);
return virt;
}
alloc = alloc_iova(&tegra->carveout.domain,
size >> tegra->carveout.shift,
tegra->carveout.limit, true);
if (!alloc) {
err = -EBUSY;
goto free_pages;
}
*dma = iova_dma_addr(&tegra->carveout.domain, alloc);
err = iommu_map(tegra->domain, *dma, virt_to_phys(virt),
size, IOMMU_READ | IOMMU_WRITE);
if (err < 0)
goto free_iova;
return virt;
free_iova:
__free_iova(&tegra->carveout.domain, alloc);
free_pages:
free_pages((unsigned long)virt, get_order(size));
return ERR_PTR(err);
}
void tegra_drm_free(struct tegra_drm *tegra, size_t size, void *virt,
dma_addr_t dma)
{
if (tegra->domain)
size = iova_align(&tegra->carveout.domain, size);
else
size = PAGE_ALIGN(size);
if (tegra->domain) {
iommu_unmap(tegra->domain, dma, size);
free_iova(&tegra->carveout.domain,
iova_pfn(&tegra->carveout.domain, dma));
}
free_pages((unsigned long)virt, get_order(size));
}
static bool host1x_drm_wants_iommu(struct host1x_device *dev)
{
struct host1x *host1x = dev_get_drvdata(dev->dev.parent);
struct iommu_domain *domain;
/*
* If the Tegra DRM clients are backed by an IOMMU, push buffers are
* likely to be allocated beyond the 32-bit boundary if sufficient
* system memory is available. This is problematic on earlier Tegra
* generations where host1x supports a maximum of 32 address bits in
* the GATHER opcode. In this case, unless host1x is behind an IOMMU
* as well it won't be able to process buffers allocated beyond the
* 32-bit boundary.
*
* The DMA API will use bounce buffers in this case, so that could
* perhaps still be made to work, even if less efficient, but there
* is another catch: in order to perform cache maintenance on pages
* allocated for discontiguous buffers we need to map and unmap the
* SG table representing these buffers. This is fine for something
* small like a push buffer, but it exhausts the bounce buffer pool
* (typically on the order of a few MiB) for framebuffers (many MiB
* for any modern resolution).
*
* Work around this by making sure that Tegra DRM clients only use
* an IOMMU if the parent host1x also uses an IOMMU.
*
* Note that there's still a small gap here that we don't cover: if
* the DMA API is backed by an IOMMU there's no way to control which
* device is attached to an IOMMU and which isn't, except via wiring
* up the device tree appropriately. This is considered an problem
* of integration, so care must be taken for the DT to be consistent.
*/
domain = iommu_get_domain_for_dev(dev->dev.parent);
/*
* Tegra20 and Tegra30 don't support addressing memory beyond the
* 32-bit boundary, so the regular GATHER opcodes will always be
* sufficient and whether or not the host1x is attached to an IOMMU
* doesn't matter.
*/
if (!domain && host1x_get_dma_mask(host1x) <= DMA_BIT_MASK(32))
return true;
return domain != NULL;
}
static int host1x_drm_probe(struct host1x_device *dev)
{
struct tegra_drm *tegra;
struct drm_device *drm;
int err;
drm/<drivers>: Constify struct drm_driver Only the following drivers aren't converted: - amdgpu, because of the driver_feature mangling due to virt support. Subsequent patch will address this. - nouveau, because DRIVER_ATOMIC uapi is still not the default on the platforms where it's supported (i.e. again driver_feature mangling) - vc4, again because of driver_feature mangling - qxl, because the ioctl table is somewhere else and moving that is maybe a bit too much, hence the num_ioctls assignment prevents a const driver structure. - arcpgu, because that is stuck behind a pending tiny-fication series from me. - legacy drivers, because legacy requires non-const drm_driver. Note that for armada I also went ahead and made the ioctl array const. Only cc'ing the driver people who've not been converted (everyone else is way too much). v2: Fix one misplaced const static, should be static const (0day) v3: - Improve commit message (Sam) Acked-by: Sam Ravnborg <sam@ravnborg.org> Cc: kernel test robot <lkp@intel.com> Acked-by: Maxime Ripard <mripard@kernel.org> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Dave Airlie <airlied@redhat.com> Cc: Gerd Hoffmann <kraxel@redhat.com> Cc: virtualization@lists.linux-foundation.org Cc: Harry Wentland <harry.wentland@amd.com> Cc: Leo Li <sunpeng.li@amd.com> Cc: Alex Deucher <alexander.deucher@amd.com> Cc: Christian König <christian.koenig@amd.com> Cc: Eric Anholt <eric@anholt.net> Cc: Maxime Ripard <mripard@kernel.org> Cc: Ben Skeggs <bskeggs@redhat.com> Cc: nouveau@lists.freedesktop.org Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20201104100425.1922351-5-daniel.vetter@ffwll.ch
2020-11-04 18:04:24 +08:00
drm = drm_dev_alloc(&tegra_drm_driver, &dev->dev);
if (IS_ERR(drm))
return PTR_ERR(drm);
tegra = kzalloc(sizeof(*tegra), GFP_KERNEL);
if (!tegra) {
err = -ENOMEM;
goto put;
}
if (host1x_drm_wants_iommu(dev) && iommu_present(&platform_bus_type)) {
tegra->domain = iommu_domain_alloc(&platform_bus_type);
if (!tegra->domain) {
err = -ENOMEM;
goto free;
}
err = iova_cache_get();
if (err < 0)
goto domain;
}
mutex_init(&tegra->clients_lock);
INIT_LIST_HEAD(&tegra->clients);
dev_set_drvdata(&dev->dev, drm);
drm->dev_private = tegra;
tegra->drm = drm;
drm_mode_config_init(drm);
drm->mode_config.min_width = 0;
drm->mode_config.min_height = 0;
drm->mode_config.max_width = 4096;
drm->mode_config.max_height = 4096;
drm->mode_config.allow_fb_modifiers = true;
drm->mode_config.normalize_zpos = true;
drm->mode_config.funcs = &tegra_drm_mode_config_funcs;
drm->mode_config.helper_private = &tegra_drm_mode_config_helpers;
err = tegra_drm_fb_prepare(drm);
if (err < 0)
goto config;
drm_kms_helper_poll_init(drm);
err = host1x_device_init(dev);
if (err < 0)
goto fbdev;
if (tegra->use_explicit_iommu) {
u64 carveout_start, carveout_end, gem_start, gem_end;
u64 dma_mask = dma_get_mask(&dev->dev);
dma_addr_t start, end;
unsigned long order;
start = tegra->domain->geometry.aperture_start & dma_mask;
end = tegra->domain->geometry.aperture_end & dma_mask;
gem_start = start;
gem_end = end - CARVEOUT_SZ;
carveout_start = gem_end + 1;
carveout_end = end;
order = __ffs(tegra->domain->pgsize_bitmap);
init_iova_domain(&tegra->carveout.domain, 1UL << order,
carveout_start >> order);
tegra->carveout.shift = iova_shift(&tegra->carveout.domain);
tegra->carveout.limit = carveout_end >> tegra->carveout.shift;
drm_mm_init(&tegra->mm, gem_start, gem_end - gem_start + 1);
mutex_init(&tegra->mm_lock);
DRM_DEBUG_DRIVER("IOMMU apertures:\n");
DRM_DEBUG_DRIVER(" GEM: %#llx-%#llx\n", gem_start, gem_end);
DRM_DEBUG_DRIVER(" Carveout: %#llx-%#llx\n", carveout_start,
carveout_end);
} else if (tegra->domain) {
iommu_domain_free(tegra->domain);
tegra->domain = NULL;
iova_cache_put();
}
if (tegra->hub) {
err = tegra_display_hub_prepare(tegra->hub);
if (err < 0)
goto device;
}
/*
* We don't use the drm_irq_install() helpers provided by the DRM
* core, so we need to set this manually in order to allow the
* DRM_IOCTL_WAIT_VBLANK to operate correctly.
*/
drm->irq_enabled = true;
/* syncpoints are used for full 32-bit hardware VBLANK counters */
drm->max_vblank_count = 0xffffffff;
err = drm_vblank_init(drm, drm->mode_config.num_crtc);
if (err < 0)
goto hub;
drm_mode_config_reset(drm);
err = drm_fb_helper_remove_conflicting_framebuffers(NULL, "tegradrmfb",
false);
if (err < 0)
goto hub;
err = tegra_drm_fb_init(drm);
if (err < 0)
goto hub;
err = drm_dev_register(drm, 0);
if (err < 0)
goto fb;
return 0;
fb:
tegra_drm_fb_exit(drm);
hub:
if (tegra->hub)
tegra_display_hub_cleanup(tegra->hub);
device:
if (tegra->domain) {
mutex_destroy(&tegra->mm_lock);
drm_mm_takedown(&tegra->mm);
put_iova_domain(&tegra->carveout.domain);
iova_cache_put();
}
host1x_device_exit(dev);
fbdev:
drm_kms_helper_poll_fini(drm);
tegra_drm_fb_free(drm);
config:
drm_mode_config_cleanup(drm);
domain:
if (tegra->domain)
iommu_domain_free(tegra->domain);
free:
kfree(tegra);
put:
drm_dev_put(drm);
return err;
}
static int host1x_drm_remove(struct host1x_device *dev)
{
struct drm_device *drm = dev_get_drvdata(&dev->dev);
struct tegra_drm *tegra = drm->dev_private;
int err;
drm_dev_unregister(drm);
drm_kms_helper_poll_fini(drm);
tegra_drm_fb_exit(drm);
drm_atomic_helper_shutdown(drm);
drm_mode_config_cleanup(drm);
if (tegra->hub)
tegra_display_hub_cleanup(tegra->hub);
err = host1x_device_exit(dev);
if (err < 0)
dev_err(&dev->dev, "host1x device cleanup failed: %d\n", err);
if (tegra->domain) {
mutex_destroy(&tegra->mm_lock);
drm_mm_takedown(&tegra->mm);
put_iova_domain(&tegra->carveout.domain);
iova_cache_put();
iommu_domain_free(tegra->domain);
}
kfree(tegra);
drm_dev_put(drm);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int host1x_drm_suspend(struct device *dev)
{
struct drm_device *drm = dev_get_drvdata(dev);
return drm_mode_config_helper_suspend(drm);
}
static int host1x_drm_resume(struct device *dev)
{
struct drm_device *drm = dev_get_drvdata(dev);
return drm_mode_config_helper_resume(drm);
}
#endif
static SIMPLE_DEV_PM_OPS(host1x_drm_pm_ops, host1x_drm_suspend,
host1x_drm_resume);
static const struct of_device_id host1x_drm_subdevs[] = {
{ .compatible = "nvidia,tegra20-dc", },
{ .compatible = "nvidia,tegra20-hdmi", },
{ .compatible = "nvidia,tegra20-gr2d", },
{ .compatible = "nvidia,tegra20-gr3d", },
{ .compatible = "nvidia,tegra30-dc", },
{ .compatible = "nvidia,tegra30-hdmi", },
{ .compatible = "nvidia,tegra30-gr2d", },
{ .compatible = "nvidia,tegra30-gr3d", },
{ .compatible = "nvidia,tegra114-dc", },
{ .compatible = "nvidia,tegra114-dsi", },
{ .compatible = "nvidia,tegra114-hdmi", },
{ .compatible = "nvidia,tegra114-gr3d", },
{ .compatible = "nvidia,tegra124-dc", },
{ .compatible = "nvidia,tegra124-sor", },
{ .compatible = "nvidia,tegra124-hdmi", },
{ .compatible = "nvidia,tegra124-dsi", },
{ .compatible = "nvidia,tegra124-vic", },
{ .compatible = "nvidia,tegra132-dsi", },
{ .compatible = "nvidia,tegra210-dc", },
{ .compatible = "nvidia,tegra210-dsi", },
{ .compatible = "nvidia,tegra210-sor", },
{ .compatible = "nvidia,tegra210-sor1", },
{ .compatible = "nvidia,tegra210-vic", },
{ .compatible = "nvidia,tegra186-display", },
{ .compatible = "nvidia,tegra186-dc", },
{ .compatible = "nvidia,tegra186-sor", },
{ .compatible = "nvidia,tegra186-sor1", },
{ .compatible = "nvidia,tegra186-vic", },
{ .compatible = "nvidia,tegra194-display", },
{ .compatible = "nvidia,tegra194-dc", },
{ .compatible = "nvidia,tegra194-sor", },
{ .compatible = "nvidia,tegra194-vic", },
{ /* sentinel */ }
};
static struct host1x_driver host1x_drm_driver = {
.driver = {
.name = "drm",
.pm = &host1x_drm_pm_ops,
},
.probe = host1x_drm_probe,
.remove = host1x_drm_remove,
.subdevs = host1x_drm_subdevs,
};
static struct platform_driver * const drivers[] = {
&tegra_display_hub_driver,
&tegra_dc_driver,
&tegra_hdmi_driver,
&tegra_dsi_driver,
&tegra_dpaux_driver,
&tegra_sor_driver,
&tegra_gr2d_driver,
&tegra_gr3d_driver,
&tegra_vic_driver,
};
static int __init host1x_drm_init(void)
{
int err;
err = host1x_driver_register(&host1x_drm_driver);
if (err < 0)
return err;
err = platform_register_drivers(drivers, ARRAY_SIZE(drivers));
if (err < 0)
goto unregister_host1x;
return 0;
unregister_host1x:
host1x_driver_unregister(&host1x_drm_driver);
return err;
}
module_init(host1x_drm_init);
static void __exit host1x_drm_exit(void)
{
platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
host1x_driver_unregister(&host1x_drm_driver);
}
module_exit(host1x_drm_exit);
MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
MODULE_DESCRIPTION("NVIDIA Tegra DRM driver");
MODULE_LICENSE("GPL v2");