void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
struct reservation_object *robj = msm_obj->resv;
struct reservation_object_list *fobj;
struct fence *fence;
uint64_t off = drm_vma_node_start(&obj->vma_node);
WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
seq_printf(m, "%08x: %c %2d (%2d) %08llx %p %zu\n",
msm_obj->flags, is_active(msm_obj) ? 'A' : 'I',
obj->name, obj->refcount.refcount.counter,
off, msm_obj->vaddr, obj->size);
rcu_read_lock();
fobj = rcu_dereference(robj->fence);
if (fobj) {
unsigned int i, shared_count = fobj->shared_count;
for (i = 0; i < shared_count; i++) {
fence = rcu_dereference(fobj->shared[i]);
describe_fence(fence, "Shared", m);
}
}
fence = rcu_dereference(robj->fence_excl);
if (fence)
describe_fence(fence, "Exclusive", m);
rcu_read_unlock();
}
void msm_gem_put_vaddr_locked(struct drm_gem_object *obj)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
WARN_ON(msm_obj->vmap_count < 1);
msm_obj->vmap_count--;
}
void msm_gem_purge(struct drm_gem_object *obj)
{
struct drm_device *dev = obj->dev;
struct msm_gem_object *msm_obj = to_msm_bo(obj);
WARN_ON(!mutex_is_locked(&dev->struct_mutex));
WARN_ON(!is_purgeable(msm_obj));
WARN_ON(obj->import_attach);
put_iova(obj);
msm_gem_vunmap(obj);
put_pages(obj);
msm_obj->madv = __MSM_MADV_PURGED;
drm_vma_node_unmap(&obj->vma_node, dev->anon_inode->i_mapping);
drm_gem_free_mmap_offset(obj);
/* Our goal here is to return as much of the memory as
* is possible back to the system as we are called from OOM.
* To do this we must instruct the shmfs to drop all of its
* backing pages, *now*.
*/
shmem_truncate_range(file_inode(obj->filp), 0, (loff_t)-1);
invalidate_mapping_pages(file_inode(obj->filp)->i_mapping,
0, (loff_t)-1);
}
int msm_gem_mmap_obj(struct drm_gem_object *obj,
struct vm_area_struct *vma)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
vma->vm_flags &= ~VM_PFNMAP;
vma->vm_flags |= VM_MIXEDMAP;
if (msm_obj->flags & MSM_BO_WC) {
vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
} else if (msm_obj->flags & MSM_BO_UNCACHED) {
vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
} else {
/*
* Shunt off cached objs to shmem file so they have their own
* address_space (so unmap_mapping_range does what we want,
* in particular in the case of mmap'd dmabufs)
*/
fput(vma->vm_file);
get_file(obj->filp);
vma->vm_pgoff = 0;
vma->vm_file = obj->filp;
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
}
return 0;
}
static dma_addr_t physaddr(struct drm_gem_object *obj)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
struct msm_drm_private *priv = obj->dev->dev_private;
return (((dma_addr_t)msm_obj->vram_node->start) << PAGE_SHIFT) +
priv->vram.paddr;
}
/* should be called under struct_mutex.. although it can be called
* from atomic context without struct_mutex to acquire an extra
* iova ref if you know one is already held.
*
* That means when I do eventually need to add support for unpinning
* the refcnt counter needs to be atomic_t.
*/
int msm_gem_get_iova_locked(struct drm_gem_object *obj, int id,
uint32_t *iova)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
int ret = 0;
if (!msm_obj->domain[id].iova) {
struct msm_drm_private *priv = obj->dev->dev_private;
struct page **pages = get_pages(obj);
if (IS_ERR(pages))
return PTR_ERR(pages);
if (iommu_present(&platform_bus_type)) {
struct msm_mmu *mmu = priv->mmus[id];
uint32_t offset;
if (WARN_ON(!mmu))
return -EINVAL;
offset = (uint32_t)mmap_offset(obj);
ret = mmu->funcs->map(mmu, offset, msm_obj->sgt,
obj->size, IOMMU_READ | IOMMU_WRITE);
msm_obj->domain[id].iova = offset;
} else {
msm_obj->domain[id].iova = physaddr(obj);
}
}
if (!ret)
*iova = msm_obj->domain[id].iova;
return ret;
}
void msm_gem_vunmap(struct drm_gem_object *obj)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
if (!msm_obj->vaddr || WARN_ON(!is_vunmapable(msm_obj)))
return;
vunmap(msm_obj->vaddr);
msm_obj->vaddr = NULL;
}
struct sg_table *msm_gem_prime_get_sg_table(struct drm_gem_object *obj)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
int npages = obj->size >> PAGE_SHIFT;
if (WARN_ON(!msm_obj->pages)) /* should have already pinned! */
return NULL;
return drm_prime_pages_to_sg(msm_obj->pages, npages);
}
/* Update madvise status, returns true if not purged, else
* false or -errno.
*/
int msm_gem_madvise(struct drm_gem_object *obj, unsigned madv)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
if (msm_obj->madv != __MSM_MADV_PURGED)
msm_obj->madv = madv;
return (msm_obj->madv != __MSM_MADV_PURGED);
}
void msm_gem_move_to_inactive(struct drm_gem_object *obj)
{
struct drm_device *dev = obj->dev;
struct msm_drm_private *priv = dev->dev_private;
struct msm_gem_object *msm_obj = to_msm_bo(obj);
WARN_ON(!mutex_is_locked(&dev->struct_mutex));
msm_obj->gpu = NULL;
list_del_init(&msm_obj->mm_list);
list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
}
void msm_gem_move_to_active(struct drm_gem_object *obj,
struct msm_gpu *gpu, bool exclusive, struct fence *fence)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
msm_obj->gpu = gpu;
if (exclusive)
reservation_object_add_excl_fence(msm_obj->resv, fence);
else
reservation_object_add_shared_fence(msm_obj->resv, fence);
list_del_init(&msm_obj->mm_list);
list_add_tail(&msm_obj->mm_list, &gpu->active_list);
}
void *msm_gem_vaddr_locked(struct drm_gem_object *obj)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
if (!msm_obj->vaddr) {
struct page **pages = get_pages(obj);
if (IS_ERR(pages))
return ERR_CAST(pages);
msm_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT,
VM_MAP, pgprot_writecombine(PAGE_KERNEL));
if (msm_obj->vaddr == NULL)
return ERR_PTR(-ENOMEM);
}
return msm_obj->vaddr;
}
static void
put_iova(struct drm_gem_object *obj)
{
struct drm_device *dev = obj->dev;
struct msm_drm_private *priv = obj->dev->dev_private;
struct msm_gem_object *msm_obj = to_msm_bo(obj);
int id;
WARN_ON(!mutex_is_locked(&dev->struct_mutex));
for (id = 0; id < ARRAY_SIZE(msm_obj->domain); id++) {
msm_gem_unmap_vma(priv->aspace[id],
&msm_obj->domain[id], msm_obj->sgt);
}
}
/* should be called under struct_mutex.. although it can be called
* from atomic context without struct_mutex to acquire an extra
* iova ref if you know one is already held.
*
* That means when I do eventually need to add support for unpinning
* the refcnt counter needs to be atomic_t.
*/
int msm_gem_get_iova_locked(struct drm_gem_object *obj, int id,
uint64_t *iova)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
int ret = 0;
if (!msm_obj->domain[id].iova) {
struct msm_drm_private *priv = obj->dev->dev_private;
struct page **pages = get_pages(obj);
if (IS_ERR(pages))
return PTR_ERR(pages);
if (iommu_present(&platform_bus_type)) {
ret = msm_gem_map_vma(priv->aspace[id], &msm_obj->domain[id],
msm_obj->sgt, obj->size >> PAGE_SHIFT);
} else {
/* must be called before _move_to_active().. */
int msm_gem_sync_object(struct drm_gem_object *obj,
struct msm_fence_context *fctx, bool exclusive)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
struct reservation_object_list *fobj;
struct fence *fence;
int i, ret;
if (!exclusive) {
/* NOTE: _reserve_shared() must happen before _add_shared_fence(),
* which makes this a slightly strange place to call it. OTOH this
* is a convenient can-fail point to hook it in. (And similar to
* how etnaviv and nouveau handle this.)
*/
ret = reservation_object_reserve_shared(msm_obj->resv);
if (ret)
return ret;
}
fobj = reservation_object_get_list(msm_obj->resv);
if (!fobj || (fobj->shared_count == 0)) {
fence = reservation_object_get_excl(msm_obj->resv);
/* don't need to wait on our own fences, since ring is fifo */
if (fence && (fence->context != fctx->context)) {
ret = fence_wait(fence, true);
if (ret)
return ret;
}
}
if (!exclusive || !fobj)
return 0;
for (i = 0; i < fobj->shared_count; i++) {
fence = rcu_dereference_protected(fobj->shared[i],
reservation_object_held(msm_obj->resv));
if (fence->context != fctx->context) {
ret = fence_wait(fence, true);
if (ret)
return ret;
}
}
return 0;
}
void msm_gem_free_object(struct drm_gem_object *obj)
{
struct drm_device *dev = obj->dev;
struct msm_drm_private *priv = obj->dev->dev_private;
struct msm_gem_object *msm_obj = to_msm_bo(obj);
int id;
WARN_ON(!mutex_is_locked(&dev->struct_mutex));
/* object should not be on active list: */
WARN_ON(is_active(msm_obj));
list_del(&msm_obj->mm_list);
for (id = 0; id < ARRAY_SIZE(msm_obj->domain); id++) {
struct msm_mmu *mmu = priv->mmus[id];
if (mmu && msm_obj->domain[id].iova) {
uint32_t offset = msm_obj->domain[id].iova;
mmu->funcs->unmap(mmu, offset, msm_obj->sgt, obj->size);
}
}
if (obj->import_attach) {
if (msm_obj->vaddr)
dma_buf_vunmap(obj->import_attach->dmabuf, msm_obj->vaddr);
/* Don't drop the pages for imported dmabuf, as they are not
* ours, just free the array we allocated:
*/
if (msm_obj->pages)
drm_free_large(msm_obj->pages);
drm_prime_gem_destroy(obj, msm_obj->sgt);
} else {
vunmap(msm_obj->vaddr);
put_pages(obj);
}
if (msm_obj->resv == &msm_obj->_resv)
reservation_object_fini(msm_obj->resv);
drm_gem_object_release(obj);
kfree(msm_obj);
}
void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
struct reservation_object *robj = msm_obj->resv;
struct reservation_object_list *fobj;
struct fence *fence;
uint64_t off = drm_vma_node_start(&obj->vma_node);
const char *madv;
WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
switch (msm_obj->madv) {
case __MSM_MADV_PURGED:
madv = " purged";
break;
case MSM_MADV_DONTNEED:
madv = " purgeable";
break;
case MSM_MADV_WILLNEED:
default:
madv = "";
break;
}
seq_printf(m, "%08x: %c %2d (%2d) %08llx %p %zu%s\n",
msm_obj->flags, is_active(msm_obj) ? 'A' : 'I',
obj->name, obj->refcount.refcount.counter,
off, msm_obj->vaddr, obj->size, madv);
rcu_read_lock();
fobj = rcu_dereference(robj->fence);
if (fobj) {
unsigned int i, shared_count = fobj->shared_count;
for (i = 0; i < shared_count; i++) {
fence = rcu_dereference(fobj->shared[i]);
describe_fence(fence, "Shared", m);
}
}
fence = rcu_dereference(robj->fence_excl);
if (fence)
describe_fence(fence, "Exclusive", m);
rcu_read_unlock();
}
/* get iova, taking a reference. Should have a matching put */
int msm_gem_get_iova(struct drm_gem_object *obj, int id, uint32_t *iova)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
int ret;
/* this is safe right now because we don't unmap until the
* bo is deleted:
*/
if (msm_obj->domain[id].iova) {
*iova = msm_obj->domain[id].iova;
return 0;
}
mutex_lock(&obj->dev->struct_mutex);
ret = msm_gem_get_iova_locked(obj, id, iova);
mutex_unlock(&obj->dev->struct_mutex);
return ret;
}
struct drm_gem_object *msm_gem_import(struct drm_device *dev,
struct dma_buf *dmabuf, struct sg_table *sgt)
{
struct msm_gem_object *msm_obj;
struct drm_gem_object *obj;
uint32_t size;
int ret, npages;
/* if we don't have IOMMU, don't bother pretending we can import: */
if (!iommu_present(&platform_bus_type)) {
dev_err(dev->dev, "cannot import without IOMMU\n");
return ERR_PTR(-EINVAL);
}
size = PAGE_ALIGN(dmabuf->size);
ret = msm_gem_new_impl(dev, size, MSM_BO_WC, dmabuf->resv, &obj);
if (ret)
goto fail;
drm_gem_private_object_init(dev, obj, size);
npages = size / PAGE_SIZE;
msm_obj = to_msm_bo(obj);
msm_obj->sgt = sgt;
msm_obj->pages = drm_malloc_ab(npages, sizeof(struct page *));
if (!msm_obj->pages) {
ret = -ENOMEM;
goto fail;
}
ret = drm_prime_sg_to_page_addr_arrays(sgt, msm_obj->pages, NULL, npages);
if (ret)
goto fail;
return obj;
fail:
if (obj)
drm_gem_object_unreference_unlocked(obj);
return ERR_PTR(ret);
}
int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op, ktime_t *timeout)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
bool write = !!(op & MSM_PREP_WRITE);
unsigned long remain =
op & MSM_PREP_NOSYNC ? 0 : timeout_to_jiffies(timeout);
long ret;
ret = reservation_object_wait_timeout_rcu(msm_obj->resv, write,
true, remain);
if (ret == 0)
return remain == 0 ? -EBUSY : -ETIMEDOUT;
else if (ret < 0)
return ret;
/* TODO cache maintenance */
return 0;
}
static void
put_iova(struct drm_gem_object *obj)
{
struct drm_device *dev = obj->dev;
struct msm_drm_private *priv = obj->dev->dev_private;
struct msm_gem_object *msm_obj = to_msm_bo(obj);
int id;
WARN_ON(!mutex_is_locked(&dev->struct_mutex));
for (id = 0; id < ARRAY_SIZE(msm_obj->domain); id++) {
struct msm_mmu *mmu = priv->mmus[id];
if (mmu && msm_obj->domain[id].iova) {
uint32_t offset = msm_obj->domain[id].iova;
mmu->funcs->unmap(mmu, offset, msm_obj->sgt, obj->size);
msm_obj->domain[id].iova = 0;
}
}
}
int msm_atomic_prepare_fb(struct drm_plane *plane,
struct drm_plane_state *new_state)
{
struct msm_drm_private *priv = plane->dev->dev_private;
struct msm_kms *kms = priv->kms;
struct drm_gem_object *obj;
struct msm_gem_object *msm_obj;
struct dma_fence *fence;
if (!new_state->fb)
return 0;
obj = msm_framebuffer_bo(new_state->fb, 0);
msm_obj = to_msm_bo(obj);
fence = reservation_object_get_excl_rcu(msm_obj->resv);
drm_atomic_set_fence_for_plane(new_state, fence);
return msm_framebuffer_prepare(new_state->fb, kms->aspace);
}
int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op, ktime_t *timeout)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
bool write = !!(op & MSM_PREP_WRITE);
if (op & MSM_PREP_NOSYNC) {
if (!reservation_object_test_signaled_rcu(msm_obj->resv, write))
return -EBUSY;
} else {
int ret;
ret = reservation_object_wait_timeout_rcu(msm_obj->resv, write,
true, timeout_to_jiffies(timeout));
if (ret <= 0)
return ret == 0 ? -ETIMEDOUT : ret;
}
/* TODO cache maintenance */
return 0;
}
void msm_gem_free_object(struct drm_gem_object *obj)
{
struct drm_device *dev = obj->dev;
struct msm_gem_object *msm_obj = to_msm_bo(obj);
WARN_ON(!mutex_is_locked(&dev->struct_mutex));
/* object should not be on active list: */
WARN_ON(is_active(msm_obj));
list_del(&msm_obj->mm_list);
put_iova(obj);
if (obj->import_attach) {
if (msm_obj->vaddr)
dma_buf_vunmap(obj->import_attach->dmabuf, msm_obj->vaddr);
/* Don't drop the pages for imported dmabuf, as they are not
* ours, just free the array we allocated:
*/
if (msm_obj->pages)
drm_free_large(msm_obj->pages);
drm_prime_gem_destroy(obj, msm_obj->sgt);
} else {
msm_gem_vunmap(obj);
put_pages(obj);
}
if (msm_obj->resv == &msm_obj->_resv)
reservation_object_fini(msm_obj->resv);
drm_gem_object_release(obj);
kfree(msm_obj);
}
static void put_pages(struct drm_gem_object *obj)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
if (msm_obj->pages) {
/* For non-cached buffers, ensure the new pages are clean
* because display controller, GPU, etc. are not coherent:
*/
if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED))
dma_unmap_sg(obj->dev->dev, msm_obj->sgt->sgl,
msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
sg_free_table(msm_obj->sgt);
kfree(msm_obj->sgt);
if (use_pages(obj))
drm_gem_put_pages(obj, msm_obj->pages, true, false);
else {
drm_mm_remove_node(msm_obj->vram_node);
drm_free_large(msm_obj->pages);
}
msm_obj->pages = NULL;
}
}
static bool use_pages(struct drm_gem_object *obj)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
return !msm_obj->vram_node;
}
/* get iova without taking a reference, used in places where you have
* already done a 'msm_gem_get_iova()'.
*/
uint32_t msm_gem_iova(struct drm_gem_object *obj, int id)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
WARN_ON(!msm_obj->domain[id].iova);
return msm_obj->domain[id].iova;
}
static int bo_allocate(struct msm_bo *msm_bo)
{
struct fd_bo *bo = &msm_bo->base;
if (!msm_bo->offset) {
struct drm_msm_gem_info req = {
.handle = bo->handle,
};
int ret;
/* if the buffer is already backed by pages then this
* doesn't actually do anything (other than giving us
* the offset)
*/
ret = drmCommandWriteRead(bo->dev->fd, DRM_MSM_GEM_INFO,
&req, sizeof(req));
if (ret) {
ERROR_MSG("alloc failed: %s", strerror(errno));
return ret;
}
msm_bo->offset = req.offset;
}
return 0;
}
static int msm_bo_offset(struct fd_bo *bo, uint64_t *offset)
{
struct msm_bo *msm_bo = to_msm_bo(bo);
int ret = bo_allocate(msm_bo);
if (ret)
return ret;
*offset = msm_bo->offset;
return 0;
}
static int msm_bo_cpu_prep(struct fd_bo *bo, struct fd_pipe *pipe, uint32_t op)
{
struct drm_msm_gem_cpu_prep req = {
.handle = bo->handle,
.op = op,
};
get_abs_timeout(&req.timeout, 5000000000);
return drmCommandWrite(bo->dev->fd, DRM_MSM_GEM_CPU_PREP, &req, sizeof(req));
}
static void msm_bo_cpu_fini(struct fd_bo *bo)
{
struct drm_msm_gem_cpu_fini req = {
.handle = bo->handle,
};
drmCommandWrite(bo->dev->fd, DRM_MSM_GEM_CPU_FINI, &req, sizeof(req));
}
static void msm_bo_destroy(struct fd_bo *bo)
{
struct msm_bo *msm_bo = to_msm_bo(bo);
free(msm_bo);
}
static const struct fd_bo_funcs funcs = {
.offset = msm_bo_offset,
.cpu_prep = msm_bo_cpu_prep,
.cpu_fini = msm_bo_cpu_fini,
.destroy = msm_bo_destroy,
};
/* allocate a buffer handle: */
drm_private int msm_bo_new_handle(struct fd_device *dev,
uint32_t size, uint32_t flags, uint32_t *handle)
{
struct drm_msm_gem_new req = {
.size = size,
.flags = MSM_BO_WC, // TODO figure out proper flags..
};
int ret;
ret = drmCommandWriteRead(dev->fd, DRM_MSM_GEM_NEW,
&req, sizeof(req));
if (ret)
return ret;
*handle = req.handle;
return 0;
}
/* allocate a new buffer object */
drm_private struct fd_bo * msm_bo_from_handle(struct fd_device *dev,
uint32_t size, uint32_t handle)
{
struct msm_bo *msm_bo;
struct fd_bo *bo;
msm_bo = calloc(1, sizeof(*msm_bo));
if (!msm_bo)
return NULL;
bo = &msm_bo->base;
bo->funcs = &funcs;
bo->fd = -1;
return bo;
}
/**
* drm_atomic_helper_commit - commit validated state object
* @dev: DRM device
* @state: the driver state object
* @nonblock: nonblocking commit
*
* This function commits a with drm_atomic_helper_check() pre-validated state
* object. This can still fail when e.g. the framebuffer reservation fails.
*
* RETURNS
* Zero for success or -errno.
*/
int msm_atomic_commit(struct drm_device *dev,
struct drm_atomic_state *state, bool nonblock)
{
struct msm_drm_private *priv = dev->dev_private;
int nplanes = dev->mode_config.num_total_plane;
int ncrtcs = dev->mode_config.num_crtc;
struct msm_commit *c;
int i, ret;
ret = drm_atomic_helper_prepare_planes(dev, state);
if (ret)
return ret;
c = commit_init(state);
if (!c) {
ret = -ENOMEM;
goto error;
}
/*
* Figure out what crtcs we have:
*/
for (i = 0; i < ncrtcs; i++) {
struct drm_crtc *crtc = state->crtcs[i];
if (!crtc)
continue;
c->crtc_mask |= (1 << drm_crtc_index(crtc));
}
/*
* Figure out what fence to wait for:
*/
for (i = 0; i < nplanes; i++) {
struct drm_plane *plane = state->planes[i];
struct drm_plane_state *new_state = state->plane_states[i];
if (!plane)
continue;
if ((plane->state->fb != new_state->fb) && new_state->fb) {
struct drm_gem_object *obj = msm_framebuffer_bo(new_state->fb, 0);
struct msm_gem_object *msm_obj = to_msm_bo(obj);
new_state->fence = reservation_object_get_excl_rcu(msm_obj->resv);
}
}
/*
* Wait for pending updates on any of the same crtc's and then
* mark our set of crtc's as busy:
*/
ret = start_atomic(dev->dev_private, c->crtc_mask);
if (ret) {
kfree(c);
goto error;
}
/*
* This is the point of no return - everything below never fails except
* when the hw goes bonghits. Which means we can commit the new state on
* the software side now.
*/
drm_atomic_helper_swap_state(dev, state);
/*
* Everything below can be run asynchronously without the need to grab
* any modeset locks at all under one conditions: It must be guaranteed
* that the asynchronous work has either been cancelled (if the driver
* supports it, which at least requires that the framebuffers get
* cleaned up with drm_atomic_helper_cleanup_planes()) or completed
* before the new state gets committed on the software side with
* drm_atomic_helper_swap_state().
*
* This scheme allows new atomic state updates to be prepared and
* checked in parallel to the asynchronous completion of the previous
* update. Which is important since compositors need to figure out the
* composition of the next frame right after having submitted the
* current layout.
*/
if (nonblock) {
queue_work(priv->atomic_wq, &c->work);
return 0;
}
complete_commit(c, false);
return 0;
error:
drm_atomic_helper_cleanup_planes(dev, state);
return ret;
}
static void add_fb(struct msm_commit *c, struct drm_framebuffer *fb)
{
struct drm_gem_object *obj = msm_framebuffer_bo(fb, 0);
c->fence = max(c->fence, msm_gem_fence(to_msm_bo(obj), MSM_PREP_READ));
}
