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drm/nouveau: protect channel create/destroy and irq handler with a spinlock

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The nv50 pgraph handler (for example) could reenable pgraph fifo access
and that would be bad when pgraph context is being unloaded (we need the
guarantee a ctxprog isn't running).

Signed-off-by: Maarten Maathuis <madman2003@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Maarten Maathuis 2010-02-01 20:58:27 +01:00 committed by Ben Skeggs
parent 6c42966768
commit ff9e5279b1
7 changed files with 36 additions and 1 deletions
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13
drivers/gpu/drm/nouveau/nouveau_channel.c
View File

@ -275,9 +275,18 @@ nouveau_channel_free(struct nouveau_channel *chan)
*/
nouveau_fence_fini(chan);
/* Ensure the channel is no longer active on the GPU */
/* This will prevent pfifo from switching channels. */
pfifo->reassign(dev, false);
/* We want to give pgraph a chance to idle and get rid of all potential
* errors. We need to do this before the lock, otherwise the irq handler
* is unable to process them.
*/
if (pgraph->channel(dev) == chan)
nouveau_wait_for_idle(dev);
spin_lock_irqsave(&dev_priv->context_switch_lock, flags);
pgraph->fifo_access(dev, false);
if (pgraph->channel(dev) == chan)
pgraph->unload_context(dev);
@ -293,6 +302,8 @@ nouveau_channel_free(struct nouveau_channel *chan)
pfifo->reassign(dev, true);
spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);
/* Release the channel's resources */
nouveau_gpuobj_ref_del(dev, &chan->pushbuf);
if (chan->pushbuf_bo) {

3
drivers/gpu/drm/nouveau/nouveau_drv.h
View File

@ -533,6 +533,9 @@ struct drm_nouveau_private {
struct nouveau_engine engine;
struct nouveau_channel *channel;
/* For PFIFO and PGRAPH. */
spinlock_t context_switch_lock;
/* RAMIN configuration, RAMFC, RAMHT and RAMRO offsets */
struct nouveau_gpuobj *ramht;
uint32_t ramin_rsvd_vram;

5
drivers/gpu/drm/nouveau/nouveau_irq.c
View File

@ -691,11 +691,14 @@ nouveau_irq_handler(DRM_IRQ_ARGS)
struct drm_device *dev = (struct drm_device *)arg;
struct drm_nouveau_private *dev_priv = dev->dev_private;
uint32_t status, fbdev_flags = 0;
unsigned long flags;
status = nv_rd32(dev, NV03_PMC_INTR_0);
if (!status)
return IRQ_NONE;
spin_lock_irqsave(&dev_priv->context_switch_lock, flags);
if (dev_priv->fbdev_info) {
fbdev_flags = dev_priv->fbdev_info->flags;
dev_priv->fbdev_info->flags |= FBINFO_HWACCEL_DISABLED;
@ -733,5 +736,7 @@ nouveau_irq_handler(DRM_IRQ_ARGS)
if (dev_priv->fbdev_info)
dev_priv->fbdev_info->flags = fbdev_flags;
spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);
return IRQ_HANDLED;
}

1
drivers/gpu/drm/nouveau/nouveau_state.c
View File

@ -391,6 +391,7 @@ nouveau_card_init(struct drm_device *dev)
goto out;
engine = &dev_priv->engine;
dev_priv->init_state = NOUVEAU_CARD_INIT_FAILED;
spin_lock_init(&dev_priv->context_switch_lock);
/* Parse BIOS tables / Run init tables if card not POSTed */
if (drm_core_check_feature(dev, DRIVER_MODESET)) {

5
drivers/gpu/drm/nouveau/nv04_fifo.c
View File

@ -117,6 +117,7 @@ nv04_fifo_create_context(struct nouveau_channel *chan)
{
struct drm_device *dev = chan->dev;
struct drm_nouveau_private *dev_priv = dev->dev_private;
unsigned long flags;
int ret;
ret = nouveau_gpuobj_new_fake(dev, NV04_RAMFC(chan->id), ~0,
@ -127,6 +128,8 @@ nv04_fifo_create_context(struct nouveau_channel *chan)
if (ret)
return ret;
spin_lock_irqsave(&dev_priv->context_switch_lock, flags);
/* Setup initial state */
dev_priv->engine.instmem.prepare_access(dev, true);
RAMFC_WR(DMA_PUT, chan->pushbuf_base);
@ -144,6 +147,8 @@ nv04_fifo_create_context(struct nouveau_channel *chan)
/* enable the fifo dma operation */
nv_wr32(dev, NV04_PFIFO_MODE,
nv_rd32(dev, NV04_PFIFO_MODE) | (1 << chan->id));
spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);
return 0;
}

5
drivers/gpu/drm/nouveau/nv40_fifo.c
View File

@ -37,6 +37,7 @@ nv40_fifo_create_context(struct nouveau_channel *chan)
struct drm_device *dev = chan->dev;
struct drm_nouveau_private *dev_priv = dev->dev_private;
uint32_t fc = NV40_RAMFC(chan->id);
unsigned long flags;
int ret;
ret = nouveau_gpuobj_new_fake(dev, NV40_RAMFC(chan->id), ~0,
@ -45,6 +46,8 @@ nv40_fifo_create_context(struct nouveau_channel *chan)
if (ret)
return ret;
spin_lock_irqsave(&dev_priv->context_switch_lock, flags);
dev_priv->engine.instmem.prepare_access(dev, true);
nv_wi32(dev, fc + 0, chan->pushbuf_base);
nv_wi32(dev, fc + 4, chan->pushbuf_base);
@ -63,6 +66,8 @@ nv40_fifo_create_context(struct nouveau_channel *chan)
/* enable the fifo dma operation */
nv_wr32(dev, NV04_PFIFO_MODE,
nv_rd32(dev, NV04_PFIFO_MODE) | (1 << chan->id));
spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);
return 0;
}

5
drivers/gpu/drm/nouveau/nv50_fifo.c
View File

@ -243,6 +243,7 @@ nv50_fifo_create_context(struct nouveau_channel *chan)
struct drm_device *dev = chan->dev;
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_gpuobj *ramfc = NULL;
unsigned long flags;
int ret;
NV_DEBUG(dev, "ch%d\n", chan->id);
@ -278,6 +279,8 @@ nv50_fifo_create_context(struct nouveau_channel *chan)
return ret;
}
spin_lock_irqsave(&dev_priv->context_switch_lock, flags);
dev_priv->engine.instmem.prepare_access(dev, true);
nv_wo32(dev, ramfc, 0x08/4, chan->pushbuf_base);
@ -306,10 +309,12 @@ nv50_fifo_create_context(struct nouveau_channel *chan)
ret = nv50_fifo_channel_enable(dev, chan->id, false);
if (ret) {
NV_ERROR(dev, "error enabling ch%d: %d\n", chan->id, ret);
spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);
nouveau_gpuobj_ref_del(dev, &chan->ramfc);
return ret;
}
spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);
return 0;
}