Skip to content

Commit

Permalink
drm/i915: Include a note about the dangers of I915_READ64/I915_WRITE64
Browse files Browse the repository at this point in the history
It is important that the user is fully aware that the seemingly atomic
read/write of a 64-bit value from MMIO space, may in fact be 2 separate
operations of 32-bits. This can lead to hilarity, such as

commit d18b961
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Wed Jul 10 13:36:23 2013 +0100

    drm/i915: Fix incoherence with fence updates on Sandybridge+

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
  • Loading branch information
Chris Wilson authored and Daniel Vetter committed Mar 21, 2014
1 parent d0a7b6d commit 698b313
Showing 1 changed file with 6 additions and 0 deletions.
6 changes: 6 additions & 0 deletions drivers/gpu/drm/i915/i915_drv.h
Original file line number Diff line number Diff line change
@@ -2736,6 +2736,12 @@ void vlv_force_wake_put(struct drm_i915_private *dev_priv, int fw_engine);
#define I915_READ_NOTRACE(reg) dev_priv->uncore.funcs.mmio_readl(dev_priv, (reg), false)
#define I915_WRITE_NOTRACE(reg, val) dev_priv->uncore.funcs.mmio_writel(dev_priv, (reg), (val), false)

/* Be very careful with read/write 64-bit values. On 32-bit machines, they
* will be implemented using 2 32-bit writes in an arbitrary order with
* an arbitrary delay between them. This can cause the hardware to
* act upon the intermediate value, possibly leading to corruption and
* machine death. You have been warned.
*/
#define I915_WRITE64(reg, val) dev_priv->uncore.funcs.mmio_writeq(dev_priv, (reg), (val), true)
#define I915_READ64(reg) dev_priv->uncore.funcs.mmio_readq(dev_priv, (reg), true)

0 comments on commit 698b313

Please sign in to comment.