drm/ttm: Add user-space objects.

Add objects needed for user-space to maintain reference counts on ttm objects.
This is used by the vmwgfx driver which allows user-space to maintain
map-counts on dma buffers, lock-counts on the ttm lock and ref-counts on
gpu surfaces, gpu contexts and dma buffer.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

2 files changed, 454 insertions, 1 deletions

diff --git a/drivers/gpu/drm/ttm/Makefile b/drivers/gpu/drm/ttm/Makefile
index b0a9de7a57c2..a9cc9f895360 100644
--- a/drivers/gpu/drm/ttm/Makefile
+++ b/drivers/gpu/drm/ttm/Makefile
@@ -3,6 +3,7 @@
 
 ccflags-y := -Iinclude/drm
 ttm-y := ttm_agp_backend.o ttm_memory.o ttm_tt.o ttm_bo.o \
-        ttm_bo_util.o ttm_bo_vm.o ttm_module.o ttm_global.o
+        ttm_bo_util.o ttm_bo_vm.o ttm_module.o ttm_global.o \
+        ttm_object.o
 
 obj-$(CONFIG_DRM_TTM) += ttm.o
diff --git a/drivers/gpu/drm/ttm/ttm_object.c b/drivers/gpu/drm/ttm/ttm_object.c
new file mode 100644
index 000000000000..1099abac824b
--- /dev/null
+++ b/drivers/gpu/drm/ttm/ttm_object.c
@@ -0,0 +1,452 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
+ */
+/** @file ttm_ref_object.c
+ *
+ * Base- and reference object implementation for the various
+ * ttm objects. Implements reference counting, minimal security checks
+ * and release on file close.
+ */
+
+/**
+ * struct ttm_object_file
+ *
+ * @tdev: Pointer to the ttm_object_device.
+ *
+ * @lock: Lock that protects the ref_list list and the
+ * ref_hash hash tables.
+ *
+ * @ref_list: List of ttm_ref_objects to be destroyed at
+ * file release.
+ *
+ * @ref_hash: Hash tables of ref objects, one per ttm_ref_type,
+ * for fast lookup of ref objects given a base object.
+ */
+
+#include "ttm/ttm_object.h"
+#include "ttm/ttm_module.h"
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <asm/atomic.h>
+
+struct ttm_object_file {
+        struct ttm_object_device *tdev;
+        rwlock_t lock;
+        struct list_head ref_list;
+        struct drm_open_hash ref_hash[TTM_REF_NUM];
+        struct kref refcount;
+};
+
+/**
+ * struct ttm_object_device
+ *
+ * @object_lock: lock that protects the object_hash hash table.
+ *
+ * @object_hash: hash table for fast lookup of object global names.
+ *
+ * @object_count: Per device object count.
+ *
+ * This is the per-device data structure needed for ttm object management.
+ */
+
+struct ttm_object_device {
+        rwlock_t object_lock;
+        struct drm_open_hash object_hash;
+        atomic_t object_count;
+        struct ttm_mem_global *mem_glob;
+};
+
+/**
+ * struct ttm_ref_object
+ *
+ * @hash: Hash entry for the per-file object reference hash.
+ *
+ * @head: List entry for the per-file list of ref-objects.
+ *
+ * @kref: Ref count.
+ *
+ * @obj: Base object this ref object is referencing.
+ *
+ * @ref_type: Type of ref object.
+ *
+ * This is similar to an idr object, but it also has a hash table entry
+ * that allows lookup with a pointer to the referenced object as a key. In
+ * that way, one can easily detect whether a base object is referenced by
+ * a particular ttm_object_file. It also carries a ref count to avoid creating
+ * multiple ref objects if a ttm_object_file references the same base
+ * object more than once.
+ */
+
+struct ttm_ref_object {
+        struct drm_hash_item hash;
+        struct list_head head;
+        struct kref kref;
+        struct ttm_base_object *obj;
+        enum ttm_ref_type ref_type;
+        struct ttm_object_file *tfile;
+};
+
+static inline struct ttm_object_file *
+ttm_object_file_ref(struct ttm_object_file *tfile)
+{
+        kref_get(&tfile->refcount);
+        return tfile;
+}
+
+static void ttm_object_file_destroy(struct kref *kref)
+{
+        struct ttm_object_file *tfile =
+                container_of(kref, struct ttm_object_file, refcount);
+
+        kfree(tfile);
+}
+
+
+static inline void ttm_object_file_unref(struct ttm_object_file **p_tfile)
+{
+        struct ttm_object_file *tfile = *p_tfile;
+
+        *p_tfile = NULL;
+        kref_put(&tfile->refcount, ttm_object_file_destroy);
+}
+
+
+int ttm_base_object_init(struct ttm_object_file *tfile,
+                         struct ttm_base_object *base,
+                         bool shareable,
+                         enum ttm_object_type object_type,
+                         void (*refcount_release) (struct ttm_base_object **),
+                         void (*ref_obj_release) (struct ttm_base_object *,
+                                                  enum ttm_ref_type ref_type))
+{
+        struct ttm_object_device *tdev = tfile->tdev;
+        int ret;
+
+        base->shareable = shareable;
+        base->tfile = ttm_object_file_ref(tfile);
+        base->refcount_release = refcount_release;
+        base->ref_obj_release = ref_obj_release;
+        base->object_type = object_type;
+        write_lock(&tdev->object_lock);
+        kref_init(&base->refcount);
+        ret = drm_ht_just_insert_please(&tdev->object_hash,
+                                        &base->hash,
+                                        (unsigned long)base, 31, 0, 0);
+        write_unlock(&tdev->object_lock);
+        if (unlikely(ret != 0))
+                goto out_err0;
+
+        ret = ttm_ref_object_add(tfile, base, TTM_REF_USAGE, NULL);
+        if (unlikely(ret != 0))
+                goto out_err1;
+
+        ttm_base_object_unref(&base);
+
+        return 0;
+out_err1:
+        (void)drm_ht_remove_item(&tdev->object_hash, &base->hash);
+out_err0:
+        return ret;
+}
+EXPORT_SYMBOL(ttm_base_object_init);
+
+static void ttm_release_base(struct kref *kref)
+{
+        struct ttm_base_object *base =
+            container_of(kref, struct ttm_base_object, refcount);
+        struct ttm_object_device *tdev = base->tfile->tdev;
+
+        (void)drm_ht_remove_item(&tdev->object_hash, &base->hash);
+        write_unlock(&tdev->object_lock);
+        if (base->refcount_release) {
+                ttm_object_file_unref(&base->tfile);
+                base->refcount_release(&base);
+        }
+        write_lock(&tdev->object_lock);
+}
+
+void ttm_base_object_unref(struct ttm_base_object **p_base)
+{
+        struct ttm_base_object *base = *p_base;
+        struct ttm_object_device *tdev = base->tfile->tdev;
+
+        *p_base = NULL;
+
+        /*
+         * Need to take the lock here to avoid racing with
+         * users trying to look up the object.
+         */
+
+        write_lock(&tdev->object_lock);
+        (void)kref_put(&base->refcount, &ttm_release_base);
+        write_unlock(&tdev->object_lock);
+}
+EXPORT_SYMBOL(ttm_base_object_unref);
+
+struct ttm_base_object *ttm_base_object_lookup(struct ttm_object_file *tfile,
+                                               uint32_t key)
+{
+        struct ttm_object_device *tdev = tfile->tdev;
+        struct ttm_base_object *base;
+        struct drm_hash_item *hash;
+        int ret;
+
+        read_lock(&tdev->object_lock);
+        ret = drm_ht_find_item(&tdev->object_hash, key, &hash);
+
+        if (likely(ret == 0)) {
+                base = drm_hash_entry(hash, struct ttm_base_object, hash);
+                kref_get(&base->refcount);
+        }
+        read_unlock(&tdev->object_lock);
+
+        if (unlikely(ret != 0))
+                return NULL;
+
+        if (tfile != base->tfile && !base->shareable) {
+                printk(KERN_ERR TTM_PFX
+                       "Attempted access of non-shareable object.\n");
+                ttm_base_object_unref(&base);
+                return NULL;
+        }
+
+        return base;
+}
+EXPORT_SYMBOL(ttm_base_object_lookup);
+
+int ttm_ref_object_add(struct ttm_object_file *tfile,
+                       struct ttm_base_object *base,
+                       enum ttm_ref_type ref_type, bool *existed)
+{
+        struct drm_open_hash *ht = &tfile->ref_hash[ref_type];
+        struct ttm_ref_object *ref;
+        struct drm_hash_item *hash;
+        struct ttm_mem_global *mem_glob = tfile->tdev->mem_glob;
+        int ret = -EINVAL;
+
+        if (existed != NULL)
+                *existed = true;
+
+        while (ret == -EINVAL) {
+                read_lock(&tfile->lock);
+                ret = drm_ht_find_item(ht, base->hash.key, &hash);
+
+                if (ret == 0) {
+                        ref = drm_hash_entry(hash, struct ttm_ref_object, hash);
+                        kref_get(&ref->kref);
+                        read_unlock(&tfile->lock);
+                        break;
+                }
+
+                read_unlock(&tfile->lock);
+                ret = ttm_mem_global_alloc(mem_glob, sizeof(*ref),
+                                           false, false);
+                if (unlikely(ret != 0))
+                        return ret;
+                ref = kmalloc(sizeof(*ref), GFP_KERNEL);
+                if (unlikely(ref == NULL)) {
+                        ttm_mem_global_free(mem_glob, sizeof(*ref));
+                        return -ENOMEM;
+                }
+
+                ref->hash.key = base->hash.key;
+                ref->obj = base;
+                ref->tfile = tfile;
+                ref->ref_type = ref_type;
+                kref_init(&ref->kref);
+
+                write_lock(&tfile->lock);
+                ret = drm_ht_insert_item(ht, &ref->hash);
+
+                if (likely(ret == 0)) {
+                        list_add_tail(&ref->head, &tfile->ref_list);
+                        kref_get(&base->refcount);
+                        write_unlock(&tfile->lock);
+                        if (existed != NULL)
+                                *existed = false;
+                        break;
+                }
+
+                write_unlock(&tfile->lock);
+                BUG_ON(ret != -EINVAL);
+
+                ttm_mem_global_free(mem_glob, sizeof(*ref));
+                kfree(ref);
+        }
+
+        return ret;
+}
+EXPORT_SYMBOL(ttm_ref_object_add);
+
+static void ttm_ref_object_release(struct kref *kref)
+{
+        struct ttm_ref_object *ref =
+            container_of(kref, struct ttm_ref_object, kref);
+        struct ttm_base_object *base = ref->obj;
+        struct ttm_object_file *tfile = ref->tfile;
+        struct drm_open_hash *ht;
+        struct ttm_mem_global *mem_glob = tfile->tdev->mem_glob;
+
+        ht = &tfile->ref_hash[ref->ref_type];
+        (void)drm_ht_remove_item(ht, &ref->hash);
+        list_del(&ref->head);
+        write_unlock(&tfile->lock);
+
+        if (ref->ref_type != TTM_REF_USAGE && base->ref_obj_release)
+                base->ref_obj_release(base, ref->ref_type);
+
+        ttm_base_object_unref(&ref->obj);
+        ttm_mem_global_free(mem_glob, sizeof(*ref));
+        kfree(ref);
+        write_lock(&tfile->lock);
+}
+
+int ttm_ref_object_base_unref(struct ttm_object_file *tfile,
+                              unsigned long key, enum ttm_ref_type ref_type)
+{
+        struct drm_open_hash *ht = &tfile->ref_hash[ref_type];
+        struct ttm_ref_object *ref;
+        struct drm_hash_item *hash;
+        int ret;
+
+        write_lock(&tfile->lock);
+        ret = drm_ht_find_item(ht, key, &hash);
+        if (unlikely(ret != 0)) {
+                write_unlock(&tfile->lock);
+                return -EINVAL;
+        }
+        ref = drm_hash_entry(hash, struct ttm_ref_object, hash);
+        kref_put(&ref->kref, ttm_ref_object_release);
+        write_unlock(&tfile->lock);
+        return 0;
+}
+EXPORT_SYMBOL(ttm_ref_object_base_unref);
+
+void ttm_object_file_release(struct ttm_object_file **p_tfile)
+{
+        struct ttm_ref_object *ref;
+        struct list_head *list;
+        unsigned int i;
+        struct ttm_object_file *tfile = *p_tfile;
+
+        *p_tfile = NULL;
+        write_lock(&tfile->lock);
+
+        /*
+         * Since we release the lock within the loop, we have to
+         * restart it from the beginning each time.
+         */
+
+        while (!list_empty(&tfile->ref_list)) {
+                list = tfile->ref_list.next;
+                ref = list_entry(list, struct ttm_ref_object, head);
+                ttm_ref_object_release(&ref->kref);
+        }
+
+        for (i = 0; i < TTM_REF_NUM; ++i)
+                drm_ht_remove(&tfile->ref_hash[i]);
+
+        write_unlock(&tfile->lock);
+        ttm_object_file_unref(&tfile);
+}
+EXPORT_SYMBOL(ttm_object_file_release);
+
+struct ttm_object_file *ttm_object_file_init(struct ttm_object_device *tdev,
+                                             unsigned int hash_order)
+{
+        struct ttm_object_file *tfile = kmalloc(sizeof(*tfile), GFP_KERNEL);
+        unsigned int i;
+        unsigned int j = 0;
+        int ret;
+
+        if (unlikely(tfile == NULL))
+                return NULL;
+
+        rwlock_init(&tfile->lock);
+        tfile->tdev = tdev;
+        kref_init(&tfile->refcount);
+        INIT_LIST_HEAD(&tfile->ref_list);
+
+        for (i = 0; i < TTM_REF_NUM; ++i) {
+                ret = drm_ht_create(&tfile->ref_hash[i], hash_order);
+                if (ret) {
+                        j = i;
+                        goto out_err;
+                }
+        }
+
+        return tfile;
+out_err:
+        for (i = 0; i < j; ++i)
+                drm_ht_remove(&tfile->ref_hash[i]);
+
+        kfree(tfile);
+
+        return NULL;
+}
+EXPORT_SYMBOL(ttm_object_file_init);
+
+struct ttm_object_device *ttm_object_device_init(struct ttm_mem_global
+                                                 *mem_glob,
+                                                 unsigned int hash_order)
+{
+        struct ttm_object_device *tdev = kmalloc(sizeof(*tdev), GFP_KERNEL);
+        int ret;
+
+        if (unlikely(tdev == NULL))
+                return NULL;
+
+        tdev->mem_glob = mem_glob;
+        rwlock_init(&tdev->object_lock);
+        atomic_set(&tdev->object_count, 0);
+        ret = drm_ht_create(&tdev->object_hash, hash_order);
+
+        if (likely(ret == 0))
+                return tdev;
+
+        kfree(tdev);
+        return NULL;
+}
+EXPORT_SYMBOL(ttm_object_device_init);
+
+void ttm_object_device_release(struct ttm_object_device **p_tdev)
+{
+        struct ttm_object_device *tdev = *p_tdev;
+
+        *p_tdev = NULL;
+
+        write_lock(&tdev->object_lock);
+        drm_ht_remove(&tdev->object_hash);
+        write_unlock(&tdev->object_lock);
+
+        kfree(tdev);
+}
+EXPORT_SYMBOL(ttm_object_device_release);