From: Naresh Kumar Kachhi <naresh.kumar.kac...@intel.com>
With runtime PM enabled, we need to make sure that all HW access
are valid (i.e. Gfx is in D0). Invalid accesses might end up in
HW hangs. Ex. A hang is seen if display register is accessed on
BYT while display power island is power gated.
This patch is covering all the IOCTLs with get/put.
TODO: limit runtime_get/put to IOCTLs that accesses HW
Signed-off-by: Naresh Kumar Kachhi <naresh.kumar.kac...@intel.com>
---
drivers/gpu/drm/i915/i915_drv.c | 21 ++++++++++++++++++++-
drivers/gpu/drm/i915/i915_ioc32.c | 11 +++++++++--
2 files changed, 29 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 82c4605..80965be 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -845,6 +845,25 @@ i915_pci_remove(struct pci_dev *pdev)
drm_put_dev(dev);
}
+static long i915_unlocked_ioctl(struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ struct drm_file *file_priv = filp->private_data;
+ struct drm_device *dev = file_priv->minor->dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ int ret;
+
+ /* Don't do anything if device is not ready */
+ if (drm_device_is_unplugged(dev))
+ return -ENODEV;
+
+ intel_runtime_pm_get(dev_priv);
+ ret = drm_ioctl(filp, cmd, arg);
+ intel_runtime_pm_put(dev_priv);
+
+ return ret;
+}
+
static int i915_pm_suspend(struct device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev);
@@ -970,7 +989,7 @@ static const struct file_operations i915_driver_fops = {
.owner = THIS_MODULE,
.open = drm_open,
.release = drm_release,
- .unlocked_ioctl = drm_ioctl,
+ .unlocked_ioctl = i915_unlocked_ioctl,
.mmap = drm_gem_mmap,
.poll = drm_poll,
.read = drm_read,
diff --git a/drivers/gpu/drm/i915/i915_ioc32.c
b/drivers/gpu/drm/i915/i915_ioc32.c
index 3c59584..bfc773e 100644
--- a/drivers/gpu/drm/i915/i915_ioc32.c
+++ b/drivers/gpu/drm/i915/i915_ioc32.c
@@ -201,12 +201,17 @@ static drm_ioctl_compat_t *i915_compat_ioctls[] = {
*/
long i915_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
+ struct drm_file *file_priv = filp->private_data;
+ struct drm_device *dev = file_priv->minor->dev;
unsigned int nr = DRM_IOCTL_NR(cmd);
drm_ioctl_compat_t *fn = NULL;
int ret;
- if (nr < DRM_COMMAND_BASE)
- return drm_compat_ioctl(filp, cmd, arg);
+ intel_runtime_pm_get(dev->dev_private);
+ if (nr < DRM_COMMAND_BASE) {
+ ret = drm_compat_ioctl(filp, cmd, arg);
+ goto out;
+ }
if (nr < DRM_COMMAND_BASE + DRM_ARRAY_SIZE(i915_compat_ioctls))
fn = i915_compat_ioctls[nr - DRM_COMMAND_BASE];
@@ -216,6 +221,8 @@ long i915_compat_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
else
ret = drm_ioctl(filp, cmd, arg);
+out:
+ intel_runtime_pm_put(dev->dev_private);
return ret;
}
#endif
--
1.8.1.2
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