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path: root/drivers/gpu/drm/nouveau/nouveau_ramht.c
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Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_ramht.c')
-rw-r--r--drivers/gpu/drm/nouveau/nouveau_ramht.c289
1 files changed, 289 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_ramht.c b/drivers/gpu/drm/nouveau/nouveau_ramht.c
new file mode 100644
index 000000000000..7f16697cc96c
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nouveau_ramht.c
@@ -0,0 +1,289 @@
+/*
+ * Copyright 2010 Red Hat Inc.
+ *
+ * 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, sublicense,
+ * 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 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 NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) 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: Ben Skeggs
+ */
+
+#include "drmP.h"
+
+#include "nouveau_drv.h"
+#include "nouveau_ramht.h"
+
+static u32
+nouveau_ramht_hash_handle(struct nouveau_channel *chan, u32 handle)
+{
+ struct drm_device *dev = chan->dev;
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ struct nouveau_ramht *ramht = chan->ramht;
+ u32 hash = 0;
+ int i;
+
+ NV_DEBUG(dev, "ch%d handle=0x%08x\n", chan->id, handle);
+
+ for (i = 32; i > 0; i -= ramht->bits) {
+ hash ^= (handle & ((1 << ramht->bits) - 1));
+ handle >>= ramht->bits;
+ }
+
+ if (dev_priv->card_type < NV_50)
+ hash ^= chan->id << (ramht->bits - 4);
+ hash <<= 3;
+
+ NV_DEBUG(dev, "hash=0x%08x\n", hash);
+ return hash;
+}
+
+static int
+nouveau_ramht_entry_valid(struct drm_device *dev, struct nouveau_gpuobj *ramht,
+ u32 offset)
+{
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ u32 ctx = nv_ro32(ramht, offset + 4);
+
+ if (dev_priv->card_type < NV_40)
+ return ((ctx & NV_RAMHT_CONTEXT_VALID) != 0);
+ return (ctx != 0);
+}
+
+static int
+nouveau_ramht_entry_same_channel(struct nouveau_channel *chan,
+ struct nouveau_gpuobj *ramht, u32 offset)
+{
+ struct drm_nouveau_private *dev_priv = chan->dev->dev_private;
+ u32 ctx = nv_ro32(ramht, offset + 4);
+
+ if (dev_priv->card_type >= NV_50)
+ return true;
+ else if (dev_priv->card_type >= NV_40)
+ return chan->id ==
+ ((ctx >> NV40_RAMHT_CONTEXT_CHANNEL_SHIFT) & 0x1f);
+ else
+ return chan->id ==
+ ((ctx >> NV_RAMHT_CONTEXT_CHANNEL_SHIFT) & 0x1f);
+}
+
+int
+nouveau_ramht_insert(struct nouveau_channel *chan, u32 handle,
+ struct nouveau_gpuobj *gpuobj)
+{
+ struct drm_device *dev = chan->dev;
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ struct nouveau_instmem_engine *instmem = &dev_priv->engine.instmem;
+ struct nouveau_ramht_entry *entry;
+ struct nouveau_gpuobj *ramht = chan->ramht->gpuobj;
+ unsigned long flags;
+ u32 ctx, co, ho;
+
+ if (nouveau_ramht_find(chan, handle))
+ return -EEXIST;
+
+ entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+ if (!entry)
+ return -ENOMEM;
+ entry->channel = chan;
+ entry->gpuobj = NULL;
+ entry->handle = handle;
+ nouveau_gpuobj_ref(gpuobj, &entry->gpuobj);
+
+ if (dev_priv->card_type < NV_40) {
+ ctx = NV_RAMHT_CONTEXT_VALID | (gpuobj->cinst >> 4) |
+ (chan->id << NV_RAMHT_CONTEXT_CHANNEL_SHIFT) |
+ (gpuobj->engine << NV_RAMHT_CONTEXT_ENGINE_SHIFT);
+ } else
+ if (dev_priv->card_type < NV_50) {
+ ctx = (gpuobj->cinst >> 4) |
+ (chan->id << NV40_RAMHT_CONTEXT_CHANNEL_SHIFT) |
+ (gpuobj->engine << NV40_RAMHT_CONTEXT_ENGINE_SHIFT);
+ } else {
+ if (gpuobj->engine == NVOBJ_ENGINE_DISPLAY) {
+ ctx = (gpuobj->cinst << 10) | 2;
+ } else {
+ ctx = (gpuobj->cinst >> 4) |
+ ((gpuobj->engine <<
+ NV40_RAMHT_CONTEXT_ENGINE_SHIFT));
+ }
+ }
+
+ spin_lock_irqsave(&chan->ramht->lock, flags);
+ list_add(&entry->head, &chan->ramht->entries);
+
+ co = ho = nouveau_ramht_hash_handle(chan, handle);
+ do {
+ if (!nouveau_ramht_entry_valid(dev, ramht, co)) {
+ NV_DEBUG(dev,
+ "insert ch%d 0x%08x: h=0x%08x, c=0x%08x\n",
+ chan->id, co, handle, ctx);
+ nv_wo32(ramht, co + 0, handle);
+ nv_wo32(ramht, co + 4, ctx);
+
+ spin_unlock_irqrestore(&chan->ramht->lock, flags);
+ instmem->flush(dev);
+ return 0;
+ }
+ NV_DEBUG(dev, "collision ch%d 0x%08x: h=0x%08x\n",
+ chan->id, co, nv_ro32(ramht, co));
+
+ co += 8;
+ if (co >= ramht->size)
+ co = 0;
+ } while (co != ho);
+
+ NV_ERROR(dev, "RAMHT space exhausted. ch=%d\n", chan->id);
+ list_del(&entry->head);
+ spin_unlock_irqrestore(&chan->ramht->lock, flags);
+ kfree(entry);
+ return -ENOMEM;
+}
+
+static void
+nouveau_ramht_remove_locked(struct nouveau_channel *chan, u32 handle)
+{
+ struct drm_device *dev = chan->dev;
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ struct nouveau_instmem_engine *instmem = &dev_priv->engine.instmem;
+ struct nouveau_gpuobj *ramht = chan->ramht->gpuobj;
+ struct nouveau_ramht_entry *entry, *tmp;
+ u32 co, ho;
+
+ list_for_each_entry_safe(entry, tmp, &chan->ramht->entries, head) {
+ if (entry->channel != chan || entry->handle != handle)
+ continue;
+
+ nouveau_gpuobj_ref(NULL, &entry->gpuobj);
+ list_del(&entry->head);
+ kfree(entry);
+ break;
+ }
+
+ co = ho = nouveau_ramht_hash_handle(chan, handle);
+ do {
+ if (nouveau_ramht_entry_valid(dev, ramht, co) &&
+ nouveau_ramht_entry_same_channel(chan, ramht, co) &&
+ (handle == nv_ro32(ramht, co))) {
+ NV_DEBUG(dev,
+ "remove ch%d 0x%08x: h=0x%08x, c=0x%08x\n",
+ chan->id, co, handle, nv_ro32(ramht, co + 4));
+ nv_wo32(ramht, co + 0, 0x00000000);
+ nv_wo32(ramht, co + 4, 0x00000000);
+ instmem->flush(dev);
+ return;
+ }
+
+ co += 8;
+ if (co >= ramht->size)
+ co = 0;
+ } while (co != ho);
+
+ NV_ERROR(dev, "RAMHT entry not found. ch=%d, handle=0x%08x\n",
+ chan->id, handle);
+}
+
+void
+nouveau_ramht_remove(struct nouveau_channel *chan, u32 handle)
+{
+ struct nouveau_ramht *ramht = chan->ramht;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ramht->lock, flags);
+ nouveau_ramht_remove_locked(chan, handle);
+ spin_unlock_irqrestore(&ramht->lock, flags);
+}
+
+struct nouveau_gpuobj *
+nouveau_ramht_find(struct nouveau_channel *chan, u32 handle)
+{
+ struct nouveau_ramht *ramht = chan->ramht;
+ struct nouveau_ramht_entry *entry;
+ struct nouveau_gpuobj *gpuobj = NULL;
+ unsigned long flags;
+
+ if (unlikely(!chan->ramht))
+ return NULL;
+
+ spin_lock_irqsave(&ramht->lock, flags);
+ list_for_each_entry(entry, &chan->ramht->entries, head) {
+ if (entry->channel == chan && entry->handle == handle) {
+ gpuobj = entry->gpuobj;
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&ramht->lock, flags);
+
+ return gpuobj;
+}
+
+int
+nouveau_ramht_new(struct drm_device *dev, struct nouveau_gpuobj *gpuobj,
+ struct nouveau_ramht **pramht)
+{
+ struct nouveau_ramht *ramht;
+
+ ramht = kzalloc(sizeof(*ramht), GFP_KERNEL);
+ if (!ramht)
+ return -ENOMEM;
+
+ ramht->dev = dev;
+ kref_init(&ramht->refcount);
+ ramht->bits = drm_order(gpuobj->size / 8);
+ INIT_LIST_HEAD(&ramht->entries);
+ spin_lock_init(&ramht->lock);
+ nouveau_gpuobj_ref(gpuobj, &ramht->gpuobj);
+
+ *pramht = ramht;
+ return 0;
+}
+
+static void
+nouveau_ramht_del(struct kref *ref)
+{
+ struct nouveau_ramht *ramht =
+ container_of(ref, struct nouveau_ramht, refcount);
+
+ nouveau_gpuobj_ref(NULL, &ramht->gpuobj);
+ kfree(ramht);
+}
+
+void
+nouveau_ramht_ref(struct nouveau_ramht *ref, struct nouveau_ramht **ptr,
+ struct nouveau_channel *chan)
+{
+ struct nouveau_ramht_entry *entry, *tmp;
+ struct nouveau_ramht *ramht;
+ unsigned long flags;
+
+ if (ref)
+ kref_get(&ref->refcount);
+
+ ramht = *ptr;
+ if (ramht) {
+ spin_lock_irqsave(&ramht->lock, flags);
+ list_for_each_entry_safe(entry, tmp, &ramht->entries, head) {
+ if (entry->channel != chan)
+ continue;
+
+ nouveau_ramht_remove_locked(chan, entry->handle);
+ }
+ spin_unlock_irqrestore(&ramht->lock, flags);
+
+ kref_put(&ramht->refcount, nouveau_ramht_del);
+ }
+ *ptr = ref;
+}