Merge tag 'topic/drm-misc-2016-06-07' of git://anongit.freedesktop.org/drm-intel into drm-next

As promised, piles of prep work all around:
- drm_atomic_state rework, prep for nonblocking commit helpers
- fence patches from Gustavo and Christian to prep for atomic fences and
  some cool work in ttm/amdgpu from Christian
- drm event prep for both nonblocking commit and atomic fences
- Gustavo seems on a crusade against the non-kms-native version of the
  vblank functions.
- prep work from Boris to nuke all the silly ->best_encoder
  implementations we have (we really only need that for truly dynamic
  cases like dvi-i vs dvi-d or dp mst selecting the right transcoder on
  intel)
- prep work from Laurent to rework the format handling functions
- and few small things all over

* tag 'topic/drm-misc-2016-06-07' of git://anongit.freedesktop.org/drm-intel: (47 commits)
  drm/dsi: Implement set tear scanline
  drm/fb_cma_helper: Implement fb_mmap callback
  drm/qxl: Remove useless drm_fb_get_bpp_depth() call
  drm/ast: Remove useless drm_fb_get_bpp_depth() call
  drm/atomic: Fix remaining places where !funcs->best_encoder is valid
  drm/core: Change declaration for gamma_set.
  Documentation: add fence-array to kernel DocBook
  drm/shmobile: use drm_crtc_vblank_{get,put}()
  drm/radeon: use drm_crtc_vblank_{get,put}()
  drm/qxl: use drm_crtc_vblank_{get,put}()
  drm/atmel: use drm_crtc_vblank_{get,put}()
  drm/armada: use drm_crtc_vblank_{get,put}()
  drm/amdgpu: use drm_crtc_vblank_{get,put}()
  drm/virtio: use drm_crtc_send_vblank_event()
  drm/udl: use drm_crtc_send_vblank_event()
  drm/qxl: use drm_crtc_send_vblank_event()
  drm/atmel: use drm_crtc_send_vblank_event()
  drm/armada: use drm_crtc_send_vblank_event()
  drm/doc: Switch to sphinx/rst fixed-width quoting
  drm/doc: Drop kerneldoc for static functions in drm_irq.c
  ...

1 files changed, 144 insertions, 0 deletions

diff --git a/drivers/dma-buf/fence-array.c b/drivers/dma-buf/fence-array.c
new file mode 100644
index 000000000000..a8731c853da6
--- /dev/null
+++ b/drivers/dma-buf/fence-array.c
@@ -0,0 +1,144 @@
+/*
+ * fence-array: aggregate fences to be waited together
+ *
+ * Copyright (C) 2016 Collabora Ltd
+ * Copyright (C) 2016 Advanced Micro Devices, Inc.
+ * Authors:
+ *      Gustavo Padovan <gustavo@padovan.org>
+ *      Christian König <christian.koenig@amd.com>
+ *
+ * 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.
+ */
+
+#include <linux/export.h>
+#include <linux/slab.h>
+#include <linux/fence-array.h>
+
+static void fence_array_cb_func(struct fence *f, struct fence_cb *cb);
+
+static const char *fence_array_get_driver_name(struct fence *fence)
+{
+        return "fence_array";
+}
+
+static const char *fence_array_get_timeline_name(struct fence *fence)
+{
+        return "unbound";
+}
+
+static void fence_array_cb_func(struct fence *f, struct fence_cb *cb)
+{
+        struct fence_array_cb *array_cb =
+                container_of(cb, struct fence_array_cb, cb);
+        struct fence_array *array = array_cb->array;
+
+        if (atomic_dec_and_test(&array->num_pending))
+                fence_signal(&array->base);
+        fence_put(&array->base);
+}
+
+static bool fence_array_enable_signaling(struct fence *fence)
+{
+        struct fence_array *array = to_fence_array(fence);
+        struct fence_array_cb *cb = (void *)(&array[1]);
+        unsigned i;
+
+        for (i = 0; i < array->num_fences; ++i) {
+                cb[i].array = array;
+                /*
+                 * As we may report that the fence is signaled before all
+                 * callbacks are complete, we need to take an additional
+                 * reference count on the array so that we do not free it too
+                 * early. The core fence handling will only hold the reference
+                 * until we signal the array as complete (but that is now
+                 * insufficient).
+                 */
+                fence_get(&array->base);
+                if (fence_add_callback(array->fences[i], &cb[i].cb,
+                                       fence_array_cb_func)) {
+                        fence_put(&array->base);
+                        if (atomic_dec_and_test(&array->num_pending))
+                                return false;
+                }
+        }
+
+        return true;
+}
+
+static bool fence_array_signaled(struct fence *fence)
+{
+        struct fence_array *array = to_fence_array(fence);
+
+        return atomic_read(&array->num_pending) <= 0;
+}
+
+static void fence_array_release(struct fence *fence)
+{
+        struct fence_array *array = to_fence_array(fence);
+        unsigned i;
+
+        for (i = 0; i < array->num_fences; ++i)
+                fence_put(array->fences[i]);
+
+        kfree(array->fences);
+        fence_free(fence);
+}
+
+const struct fence_ops fence_array_ops = {
+        .get_driver_name = fence_array_get_driver_name,
+        .get_timeline_name = fence_array_get_timeline_name,
+        .enable_signaling = fence_array_enable_signaling,
+        .signaled = fence_array_signaled,
+        .wait = fence_default_wait,
+        .release = fence_array_release,
+};
+
+/**
+ * fence_array_create - Create a custom fence array
+ * @num_fences:         [in]    number of fences to add in the array
+ * @fences:             [in]    array containing the fences
+ * @context:            [in]    fence context to use
+ * @seqno:              [in]    sequence number to use
+ * @signal_on_any       [in]    signal on any fence in the array
+ *
+ * Allocate a fence_array object and initialize the base fence with fence_init().
+ * In case of error it returns NULL.
+ *
+ * The caller should allocte the fences array with num_fences size
+ * and fill it with the fences it wants to add to the object. Ownership of this
+ * array is take and fence_put() is used on each fence on release.
+ *
+ * If @signal_on_any is true the fence array signals if any fence in the array
+ * signals, otherwise it signals when all fences in the array signal.
+ */
+struct fence_array *fence_array_create(int num_fences, struct fence **fences,
+                                       u64 context, unsigned seqno,
+                                       bool signal_on_any)
+{
+        struct fence_array *array;
+        size_t size = sizeof(*array);
+
+        /* Allocate the callback structures behind the array. */
+        size += num_fences * sizeof(struct fence_array_cb);
+        array = kzalloc(size, GFP_KERNEL);
+        if (!array)
+                return NULL;
+
+        spin_lock_init(&array->lock);
+        fence_init(&array->base, &fence_array_ops, &array->lock,
+                   context, seqno);
+
+        array->num_fences = num_fences;
+        atomic_set(&array->num_pending, signal_on_any ? 1 : num_fences);
+        array->fences = fences;
+
+        return array;
+}
+EXPORT_SYMBOL(fence_array_create);