The old code generated an interrupt storm bad enough to completely
take down my system.
Signed-off-by: Andy Lutomirski <l...@mit.edu>
---
drivers/gpu/drm/nouveau/nouveau_drv.h | 6 +++++
drivers/gpu/drm/nouveau/nouveau_irq.c | 1 +
drivers/gpu/drm/nouveau/nv50_display.c | 35 +++++++++++++++++++++++--------
3 files changed, 33 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h
b/drivers/gpu/drm/nouveau/nouveau_drv.h
index b1be617..c926d88 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drv.h
+++ b/drivers/gpu/drm/nouveau/nouveau_drv.h
@@ -531,6 +531,12 @@ 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 {
diff --git a/drivers/gpu/drm/nouveau/nouveau_irq.c
b/drivers/gpu/drm/nouveau/nouveau_irq.c
index 794b0ee..b62a601 100644
--- a/drivers/gpu/drm/nouveau/nouveau_irq.c
+++ b/drivers/gpu/drm/nouveau/nouveau_irq.c
@@ -52,6 +52,7 @@ 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);
}
}
diff --git a/drivers/gpu/drm/nouveau/nv50_display.c
b/drivers/gpu/drm/nouveau/nv50_display.c
index 83a7d27..014f69c 100644
--- a/drivers/gpu/drm/nouveau/nv50_display.c
+++ b/drivers/gpu/drm/nouveau/nv50_display.c
@@ -1012,11 +1012,18 @@ 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, NV50_PCONNECTOR_HOTPLUG_CTRL) & nv_rd32(dev,
NV50_PCONNECTOR_HOTPLUG_INTR);
+ 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, NV50_PCONNECTOR_HOTPLUG_INTR);
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);
@@ -1058,10 +1065,6 @@ nv50_display_irq_hotplug_bh(struct work_struct *work)
helper->dpms(connector->encoder, DRM_MODE_DPMS_OFF);
}
- nv_wr32(dev, NV50_PCONNECTOR_HOTPLUG_CTRL, nv_rd32(dev,
NV50_PCONNECTOR_HOTPLUG_CTRL));
- if (dev_priv->chipset >= 0x90)
- nv_wr32(dev, 0xe074, nv_rd32(dev, 0xe074));
-
drm_helper_hpd_irq_event(dev);
}
@@ -1072,8 +1075,22 @@ 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, NV50_PCONNECTOR_HOTPLUG_CTRL);
+ nv_wr32(dev, NV50_PCONNECTOR_HOTPLUG_CTRL, 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) {
--
1.7.3.2
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