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nouveau: Acknowledge HPD irq in handler, not bottom half

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The old code generated an interrupt storm bad enough to completely
take down my system.

Signed-off-by: Andy Lutomirski <luto@mit.edu>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Andy Lutomirski 2010-11-16 18:40:52 -05:00 committed by Ben Skeggs
parent c1b60ece91
commit ab838338a2
3 changed files with 33 additions and 9 deletions
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6
drivers/gpu/drm/nouveau/nouveau_drv.h
View file

@ -584,6 +584,12 @@ struct drm_nouveau_private {
struct work_struct irq_work;
struct work_struct hpd_work;
struct {
spinlock_t lock;
uint32_t hpd0_bits;
uint32_t hpd1_bits;
} hpd_state;
struct list_head vbl_waiting;
struct {

1
drivers/gpu/drm/nouveau/nouveau_irq.c
View file

@ -60,6 +60,7 @@ nouveau_irq_preinstall(struct drm_device *dev)
if (dev_priv->card_type >= NV_50) {
INIT_WORK(&dev_priv->irq_work, nv50_display_irq_handler_bh);
INIT_WORK(&dev_priv->hpd_work, nv50_display_irq_hotplug_bh);
spin_lock_init(&dev_priv->hpd_state.lock);
INIT_LIST_HEAD(&dev_priv->vbl_waiting);
}
}

35
drivers/gpu/drm/nouveau/nv50_display.c
View file

@ -1032,11 +1032,18 @@ nv50_display_irq_hotplug_bh(struct work_struct *work)
struct drm_connector *connector;
const uint32_t gpio_reg[4] = { 0xe104, 0xe108, 0xe280, 0xe284 };
uint32_t unplug_mask, plug_mask, change_mask;
uint32_t hpd0, hpd1 = 0;
uint32_t hpd0, hpd1;
hpd0 = nv_rd32(dev, 0xe054) & nv_rd32(dev, 0xe050);
spin_lock_irq(&dev_priv->hpd_state.lock);
hpd0 = dev_priv->hpd_state.hpd0_bits;
dev_priv->hpd_state.hpd0_bits = 0;
hpd1 = dev_priv->hpd_state.hpd1_bits;
dev_priv->hpd_state.hpd1_bits = 0;
spin_unlock_irq(&dev_priv->hpd_state.lock);
hpd0 &= nv_rd32(dev, 0xe050);
if (dev_priv->chipset >= 0x90)
hpd1 = nv_rd32(dev, 0xe074) & nv_rd32(dev, 0xe070);
hpd1 &= nv_rd32(dev, 0xe070);
plug_mask = (hpd0 & 0x0000ffff) | (hpd1 << 16);
unplug_mask = (hpd0 >> 16) | (hpd1 & 0xffff0000);
@ -1078,10 +1085,6 @@ nv50_display_irq_hotplug_bh(struct work_struct *work)
helper->dpms(connector->encoder, DRM_MODE_DPMS_OFF);
}
nv_wr32(dev, 0xe054, nv_rd32(dev, 0xe054));
if (dev_priv->chipset >= 0x90)
nv_wr32(dev, 0xe074, nv_rd32(dev, 0xe074));
drm_helper_hpd_irq_event(dev);
}
@ -1092,8 +1095,22 @@ nv50_display_irq_handler(struct drm_device *dev)
uint32_t delayed = 0;
if (nv_rd32(dev, NV50_PMC_INTR_0) & NV50_PMC_INTR_0_HOTPLUG) {
if (!work_pending(&dev_priv->hpd_work))
queue_work(dev_priv->wq, &dev_priv->hpd_work);
uint32_t hpd0_bits, hpd1_bits = 0;
hpd0_bits = nv_rd32(dev, 0xe054);
nv_wr32(dev, 0xe054, hpd0_bits);
if (dev_priv->chipset >= 0x90) {
hpd1_bits = nv_rd32(dev, 0xe074);
nv_wr32(dev, 0xe074, hpd1_bits);
}
spin_lock(&dev_priv->hpd_state.lock);
dev_priv->hpd_state.hpd0_bits |= hpd0_bits;
dev_priv->hpd_state.hpd1_bits |= hpd1_bits;
spin_unlock(&dev_priv->hpd_state.lock);
queue_work(dev_priv->wq, &dev_priv->hpd_work);
}
while (nv_rd32(dev, NV50_PMC_INTR_0) & NV50_PMC_INTR_0_DISPLAY) {