/* doesn't need to be called inside nvmap_pin_lock, since this will only
* expand the available VM area */
static int handle_unpin(struct nvmap_client *client, struct nvmap_handle *h)
{
int ret = 0;
nvmap_mru_lock(client->share);
if (atomic_read(&h->pin) == 0) {
nvmap_err(client, "%s unpinning unpinned handle %p\n",
current->group_leader->comm, h);
nvmap_mru_unlock(client->share);
return 0;
}
BUG_ON(!h->alloc);
if (!atomic_dec_return(&h->pin)) {
if (h->heap_pgalloc && h->pgalloc.area) {
/* if a secure handle is clean (i.e., mapped into
* IOVMM, it needs to be zapped on unpin. */
if (h->secure && !h->pgalloc.dirty) {
tegra_iovmm_zap_vm(h->pgalloc.area);
h->pgalloc.dirty = true;
}
nvmap_mru_insert_locked(client->share, h);
ret = 1;
}
}
nvmap_mru_unlock(client->share);
nvmap_handle_put(h);
return ret;
}
static int pin_array_locked(struct nvmap_client *client,
struct nvmap_handle **h, int count)
{
int pinned;
int i;
int err = 0;
/* Flush deferred cache maintenance if needed */
for (pinned = 0; pinned < count; pinned++)
if (nvmap_find_cache_maint_op(client->dev, h[pinned]))
nvmap_cache_maint_ops_flush(client->dev, h[pinned]);
nvmap_mru_lock(client->share);
for (pinned = 0; pinned < count; pinned++) {
err = pin_locked(client, h[pinned]);
if (err)
break;
}
nvmap_mru_unlock(client->share);
if (err) {
/* unpin pinned handles */
for (i = 0; i < pinned; i++) {
/* inc ref counter, because
* handle_unpin decrements it */
nvmap_handle_get(h[i]);
/* unpin handles and free vm */
handle_unpin(client, h[i], true);
}
}
if (err && tegra_iovmm_get_max_free(client->share->iovmm) >=
client->iovm_limit) {
/* First attempt to pin in empty iovmm
* may still fail because of fragmentation caused by
* placing handles in MRU areas. After such failure
* all MRU gets cleaned and iovm space is freed.
*
* We have to do pinning again here since there might be is
* no more incoming pin_wait wakeup calls from unpin
* operations */
nvmap_mru_lock(client->share);
for (pinned = 0; pinned < count; pinned++) {
err = pin_locked(client, h[pinned]);
if (err)
break;
}
nvmap_mru_unlock(client->share);
if (err) {
pr_err("Pinning in empty iovmm failed!!!\n");
BUG_ON(1);
}
}
return err;
}
void nvmap_mru_remove(struct nvmap_share *s, struct nvmap_handle *h)
{
nvmap_mru_lock(s);
if (!list_empty(&h->pgalloc.mru_list))
list_del(&h->pgalloc.mru_list);
nvmap_mru_unlock(s);
INIT_LIST_HEAD(&h->pgalloc.mru_list);
}
/* doesn't need to be called inside nvmap_pin_lock, since this will only
* expand the available VM area */
static int handle_unpin(struct nvmap_client *client,
struct nvmap_handle *h, int free_vm)
{
int ret = 0;
nvmap_mru_lock(client->share);
/* */
#if defined(CONFIG_MACH_LGE)
BUG_ON(!h);
#endif
/* */
if (atomic_read(&h->pin) == 0) {
trace_handle_unpin_error(client, h, atomic_read(&h->pin));
nvmap_err(client, "%s unpinning unpinned handle %p\n",
current->group_leader->comm, h);
nvmap_mru_unlock(client->share);
return 0;
}
BUG_ON(!h->alloc);
if (!atomic_dec_return(&h->pin)) {
if (h->heap_pgalloc && h->pgalloc.area) {
/* if a secure handle is clean (i.e., mapped into
* IOVMM, it needs to be zapped on unpin. */
if (h->secure && !h->pgalloc.dirty) {
tegra_iovmm_zap_vm(h->pgalloc.area);
h->pgalloc.dirty = true;
}
if (free_vm) {
tegra_iovmm_free_vm(h->pgalloc.area);
h->pgalloc.area = NULL;
} else
nvmap_mru_insert_locked(client->share, h);
ret = 1;
}
}
trace_handle_unpin(client, h, atomic_read(&h->pin));
nvmap_mru_unlock(client->share);
nvmap_handle_put(h);
return ret;
}
/* must be called inside nvmap_pin_lock, to ensure that an entire stream
* of pins will complete without racing with a second stream. handle should
* have nvmap_handle_get (or nvmap_validate_get) called before calling
* this function. */
static int pin_locked(struct nvmap_client *client, struct nvmap_handle *h)
{
struct tegra_iovmm_area *area;
BUG_ON(!h->alloc);
nvmap_mru_lock(client->share);
if (atomic_inc_return(&h->pin) == 1) {
if (h->heap_pgalloc && !h->pgalloc.contig) {
area = nvmap_handle_iovmm_locked(client, h);
if (!area) {
/* no race here, inside the pin mutex */
atomic_dec(&h->pin);
nvmap_mru_unlock(client->share);
return -ENOMEM;
}
if (area != h->pgalloc.area)
h->pgalloc.dirty = true;
h->pgalloc.area = area;
}
}
nvmap_mru_unlock(client->share);
return 0;
}
