drm/etnaviv: add initial etnaviv DRM driver
This adds the etnaviv DRM driver and hooks it up in Makefiles
and Kconfig.
Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
new file mode 100644
index 0000000..1aba01a
--- /dev/null
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
@@ -0,0 +1,443 @@
+/*
+ * Copyright (C) 2015 Etnaviv Project
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/reservation.h>
+#include "etnaviv_drv.h"
+#include "etnaviv_gpu.h"
+#include "etnaviv_gem.h"
+
+/*
+ * Cmdstream submission:
+ */
+
+#define BO_INVALID_FLAGS ~(ETNA_SUBMIT_BO_READ | ETNA_SUBMIT_BO_WRITE)
+/* make sure these don't conflict w/ ETNAVIV_SUBMIT_BO_x */
+#define BO_LOCKED 0x4000
+#define BO_PINNED 0x2000
+
+static inline void __user *to_user_ptr(u64 address)
+{
+ return (void __user *)(uintptr_t)address;
+}
+
+static struct etnaviv_gem_submit *submit_create(struct drm_device *dev,
+ struct etnaviv_gpu *gpu, size_t nr)
+{
+ struct etnaviv_gem_submit *submit;
+ size_t sz = size_vstruct(nr, sizeof(submit->bos[0]), sizeof(*submit));
+
+ submit = kmalloc(sz, GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
+ if (submit) {
+ submit->dev = dev;
+ submit->gpu = gpu;
+
+ /* initially, until copy_from_user() and bo lookup succeeds: */
+ submit->nr_bos = 0;
+
+ ww_acquire_init(&submit->ticket, &reservation_ww_class);
+ }
+
+ return submit;
+}
+
+static int submit_lookup_objects(struct etnaviv_gem_submit *submit,
+ struct drm_file *file, struct drm_etnaviv_gem_submit_bo *submit_bos,
+ unsigned nr_bos)
+{
+ struct drm_etnaviv_gem_submit_bo *bo;
+ unsigned i;
+ int ret = 0;
+
+ spin_lock(&file->table_lock);
+
+ for (i = 0, bo = submit_bos; i < nr_bos; i++, bo++) {
+ struct drm_gem_object *obj;
+
+ if (bo->flags & BO_INVALID_FLAGS) {
+ DRM_ERROR("invalid flags: %x\n", bo->flags);
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+
+ submit->bos[i].flags = bo->flags;
+
+ /* normally use drm_gem_object_lookup(), but for bulk lookup
+ * all under single table_lock just hit object_idr directly:
+ */
+ obj = idr_find(&file->object_idr, bo->handle);
+ if (!obj) {
+ DRM_ERROR("invalid handle %u at index %u\n",
+ bo->handle, i);
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+
+ /*
+ * Take a refcount on the object. The file table lock
+ * prevents the object_idr's refcount on this being dropped.
+ */
+ drm_gem_object_reference(obj);
+
+ submit->bos[i].obj = to_etnaviv_bo(obj);
+ }
+
+out_unlock:
+ submit->nr_bos = i;
+ spin_unlock(&file->table_lock);
+
+ return ret;
+}
+
+static void submit_unlock_object(struct etnaviv_gem_submit *submit, int i)
+{
+ if (submit->bos[i].flags & BO_LOCKED) {
+ struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
+
+ ww_mutex_unlock(&etnaviv_obj->resv->lock);
+ submit->bos[i].flags &= ~BO_LOCKED;
+ }
+}
+
+static int submit_lock_objects(struct etnaviv_gem_submit *submit)
+{
+ int contended, slow_locked = -1, i, ret = 0;
+
+retry:
+ for (i = 0; i < submit->nr_bos; i++) {
+ struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
+
+ if (slow_locked == i)
+ slow_locked = -1;
+
+ contended = i;
+
+ if (!(submit->bos[i].flags & BO_LOCKED)) {
+ ret = ww_mutex_lock_interruptible(&etnaviv_obj->resv->lock,
+ &submit->ticket);
+ if (ret == -EALREADY)
+ DRM_ERROR("BO at index %u already on submit list\n",
+ i);
+ if (ret)
+ goto fail;
+ submit->bos[i].flags |= BO_LOCKED;
+ }
+ }
+
+ ww_acquire_done(&submit->ticket);
+
+ return 0;
+
+fail:
+ for (; i >= 0; i--)
+ submit_unlock_object(submit, i);
+
+ if (slow_locked > 0)
+ submit_unlock_object(submit, slow_locked);
+
+ if (ret == -EDEADLK) {
+ struct etnaviv_gem_object *etnaviv_obj;
+
+ etnaviv_obj = submit->bos[contended].obj;
+
+ /* we lost out in a seqno race, lock and retry.. */
+ ret = ww_mutex_lock_slow_interruptible(&etnaviv_obj->resv->lock,
+ &submit->ticket);
+ if (!ret) {
+ submit->bos[contended].flags |= BO_LOCKED;
+ slow_locked = contended;
+ goto retry;
+ }
+ }
+
+ return ret;
+}
+
+static int submit_fence_sync(const struct etnaviv_gem_submit *submit)
+{
+ unsigned int context = submit->gpu->fence_context;
+ int i, ret = 0;
+
+ for (i = 0; i < submit->nr_bos; i++) {
+ struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
+ bool write = submit->bos[i].flags & ETNA_SUBMIT_BO_WRITE;
+
+ ret = etnaviv_gpu_fence_sync_obj(etnaviv_obj, context, write);
+ if (ret)
+ break;
+ }
+
+ return ret;
+}
+
+static void submit_unpin_objects(struct etnaviv_gem_submit *submit)
+{
+ int i;
+
+ for (i = 0; i < submit->nr_bos; i++) {
+ struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
+
+ if (submit->bos[i].flags & BO_PINNED)
+ etnaviv_gem_put_iova(submit->gpu, &etnaviv_obj->base);
+
+ submit->bos[i].iova = 0;
+ submit->bos[i].flags &= ~BO_PINNED;
+ }
+}
+
+static int submit_pin_objects(struct etnaviv_gem_submit *submit)
+{
+ int i, ret = 0;
+
+ for (i = 0; i < submit->nr_bos; i++) {
+ struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
+ u32 iova;
+
+ ret = etnaviv_gem_get_iova(submit->gpu, &etnaviv_obj->base,
+ &iova);
+ if (ret)
+ break;
+
+ submit->bos[i].flags |= BO_PINNED;
+ submit->bos[i].iova = iova;
+ }
+
+ return ret;
+}
+
+static int submit_bo(struct etnaviv_gem_submit *submit, u32 idx,
+ struct etnaviv_gem_object **obj, u32 *iova)
+{
+ if (idx >= submit->nr_bos) {
+ DRM_ERROR("invalid buffer index: %u (out of %u)\n",
+ idx, submit->nr_bos);
+ return -EINVAL;
+ }
+
+ if (obj)
+ *obj = submit->bos[idx].obj;
+ if (iova)
+ *iova = submit->bos[idx].iova;
+
+ return 0;
+}
+
+/* process the reloc's and patch up the cmdstream as needed: */
+static int submit_reloc(struct etnaviv_gem_submit *submit, void *stream,
+ u32 size, const struct drm_etnaviv_gem_submit_reloc *relocs,
+ u32 nr_relocs)
+{
+ u32 i, last_offset = 0;
+ u32 *ptr = stream;
+ int ret;
+
+ for (i = 0; i < nr_relocs; i++) {
+ const struct drm_etnaviv_gem_submit_reloc *r = relocs + i;
+ struct etnaviv_gem_object *bobj;
+ u32 iova, off;
+
+ if (unlikely(r->flags)) {
+ DRM_ERROR("invalid reloc flags\n");
+ return -EINVAL;
+ }
+
+ if (r->submit_offset % 4) {
+ DRM_ERROR("non-aligned reloc offset: %u\n",
+ r->submit_offset);
+ return -EINVAL;
+ }
+
+ /* offset in dwords: */
+ off = r->submit_offset / 4;
+
+ if ((off >= size ) ||
+ (off < last_offset)) {
+ DRM_ERROR("invalid offset %u at reloc %u\n", off, i);
+ return -EINVAL;
+ }
+
+ ret = submit_bo(submit, r->reloc_idx, &bobj, &iova);
+ if (ret)
+ return ret;
+
+ if (r->reloc_offset >=
+ bobj->base.size - sizeof(*ptr)) {
+ DRM_ERROR("relocation %u outside object", i);
+ return -EINVAL;
+ }
+
+ ptr[off] = iova + r->reloc_offset;
+
+ last_offset = off;
+ }
+
+ return 0;
+}
+
+static void submit_cleanup(struct etnaviv_gem_submit *submit)
+{
+ unsigned i;
+
+ for (i = 0; i < submit->nr_bos; i++) {
+ struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
+
+ submit_unlock_object(submit, i);
+ drm_gem_object_unreference_unlocked(&etnaviv_obj->base);
+ }
+
+ ww_acquire_fini(&submit->ticket);
+ kfree(submit);
+}
+
+int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data,
+ struct drm_file *file)
+{
+ struct etnaviv_drm_private *priv = dev->dev_private;
+ struct drm_etnaviv_gem_submit *args = data;
+ struct drm_etnaviv_gem_submit_reloc *relocs;
+ struct drm_etnaviv_gem_submit_bo *bos;
+ struct etnaviv_gem_submit *submit;
+ struct etnaviv_cmdbuf *cmdbuf;
+ struct etnaviv_gpu *gpu;
+ void *stream;
+ int ret;
+
+ if (args->pipe >= ETNA_MAX_PIPES)
+ return -EINVAL;
+
+ gpu = priv->gpu[args->pipe];
+ if (!gpu)
+ return -ENXIO;
+
+ if (args->stream_size % 4) {
+ DRM_ERROR("non-aligned cmdstream buffer size: %u\n",
+ args->stream_size);
+ return -EINVAL;
+ }
+
+ if (args->exec_state != ETNA_PIPE_3D &&
+ args->exec_state != ETNA_PIPE_2D &&
+ args->exec_state != ETNA_PIPE_VG) {
+ DRM_ERROR("invalid exec_state: 0x%x\n", args->exec_state);
+ return -EINVAL;
+ }
+
+ /*
+ * Copy the command submission and bo array to kernel space in
+ * one go, and do this outside of any locks.
+ */
+ bos = drm_malloc_ab(args->nr_bos, sizeof(*bos));
+ relocs = drm_malloc_ab(args->nr_relocs, sizeof(*relocs));
+ stream = drm_malloc_ab(1, args->stream_size);
+ cmdbuf = etnaviv_gpu_cmdbuf_new(gpu, ALIGN(args->stream_size, 8) + 8,
+ args->nr_bos);
+ if (!bos || !relocs || !stream || !cmdbuf) {
+ ret = -ENOMEM;
+ goto err_submit_cmds;
+ }
+
+ cmdbuf->exec_state = args->exec_state;
+ cmdbuf->ctx = file->driver_priv;
+
+ ret = copy_from_user(bos, to_user_ptr(args->bos),
+ args->nr_bos * sizeof(*bos));
+ if (ret) {
+ ret = -EFAULT;
+ goto err_submit_cmds;
+ }
+
+ ret = copy_from_user(relocs, to_user_ptr(args->relocs),
+ args->nr_relocs * sizeof(*relocs));
+ if (ret) {
+ ret = -EFAULT;
+ goto err_submit_cmds;
+ }
+
+ ret = copy_from_user(stream, to_user_ptr(args->stream),
+ args->stream_size);
+ if (ret) {
+ ret = -EFAULT;
+ goto err_submit_cmds;
+ }
+
+ submit = submit_create(dev, gpu, args->nr_bos);
+ if (!submit) {
+ ret = -ENOMEM;
+ goto err_submit_cmds;
+ }
+
+ ret = submit_lookup_objects(submit, file, bos, args->nr_bos);
+ if (ret)
+ goto err_submit_objects;
+
+ ret = submit_lock_objects(submit);
+ if (ret)
+ goto err_submit_objects;
+
+ if (!etnaviv_cmd_validate_one(gpu, stream, args->stream_size / 4,
+ relocs, args->nr_relocs)) {
+ ret = -EINVAL;
+ goto err_submit_objects;
+ }
+
+ ret = submit_fence_sync(submit);
+ if (ret)
+ goto err_submit_objects;
+
+ ret = submit_pin_objects(submit);
+ if (ret)
+ goto out;
+
+ ret = submit_reloc(submit, stream, args->stream_size / 4,
+ relocs, args->nr_relocs);
+ if (ret)
+ goto out;
+
+ memcpy(cmdbuf->vaddr, stream, args->stream_size);
+ cmdbuf->user_size = ALIGN(args->stream_size, 8);
+
+ ret = etnaviv_gpu_submit(gpu, submit, cmdbuf);
+ if (ret == 0)
+ cmdbuf = NULL;
+
+ args->fence = submit->fence;
+
+out:
+ submit_unpin_objects(submit);
+
+ /*
+ * If we're returning -EAGAIN, it may be due to the userptr code
+ * wanting to run its workqueue outside of any locks. Flush our
+ * workqueue to ensure that it is run in a timely manner.
+ */
+ if (ret == -EAGAIN)
+ flush_workqueue(priv->wq);
+
+err_submit_objects:
+ submit_cleanup(submit);
+
+err_submit_cmds:
+ /* if we still own the cmdbuf */
+ if (cmdbuf)
+ etnaviv_gpu_cmdbuf_free(cmdbuf);
+ if (stream)
+ drm_free_large(stream);
+ if (bos)
+ drm_free_large(bos);
+ if (relocs)
+ drm_free_large(relocs);
+
+ return ret;
+}