[Intel-gfx] [PATCH RESEND] drm/i915: add display engine uncore helpers

[Chris Wilson]

Quoting Jani Nikula (2020-01-21 13:58:08)
> On Tue, 21 Jan 2020, Chris Wilson <chris at chris-wilson.co.uk> wrote:
> > Quoting Jani Nikula (2020-01-21 11:39:15)
> >> Add convenience helpers for the most common uncore operations with
> >> struct drm_i915_private * as context rather than struct intel_uncore *.
> >> 
> >> The goal is to replace all instances of I915_READ(),
> >> I915_POSTING_READ(), I915_WRITE(), I915_READ_FW(), and I915_WRITE_FW()
> >> in display/ with these, to finally be able to get rid of the implicit
> >> dev_priv local parameter use.
> >> 
> >> The idea is that any non-u32 reads or writes are special enough that
> >> they can use the intel_uncore_* functions directly.
> >> 
> >> v2:
> >> - rename the file intel_de.h
> >> - move intel_de_wait_for_* there too
> >> - also add de fw helpers
> >> 
> >> Cc: Chris Wilson <chris at chris-wilson.co.uk>
> >> Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
> >> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> >> Cc: Lucas De Marchi <lucas.demarchi at intel.com>
> >> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> >> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> >> Signed-off-by: Jani Nikula <jani.nikula at intel.com>
> >> ---
> >>  drivers/gpu/drm/i915/display/intel_de.h       | 72 +++++++++++++++++++
> >>  .../drm/i915/display/intel_display_types.h    |  1 +
> >>  drivers/gpu/drm/i915/i915_drv.h               | 14 ----
> >>  3 files changed, 73 insertions(+), 14 deletions(-)
> >>  create mode 100644 drivers/gpu/drm/i915/display/intel_de.h
> >> 
> >> diff --git a/drivers/gpu/drm/i915/display/intel_de.h b/drivers/gpu/drm/i915/display/intel_de.h
> >> new file mode 100644
> >> index 000000000000..00da10bf35f5
> >> --- /dev/null
> >> +++ b/drivers/gpu/drm/i915/display/intel_de.h
> >> @@ -0,0 +1,72 @@
> >> +/* SPDX-License-Identifier: MIT */
> >> +/*
> >> + * Copyright © 2019 Intel Corporation
> >> + */
> >> +
> >> +#ifndef __INTEL_DE_H__
> >> +#define __INTEL_DE_H__
> >> +
> >> +#include "i915_drv.h"
> >> +#include "i915_reg.h"
> >> +#include "intel_uncore.h"
> >> +
> >> +static inline u32
> >> +intel_de_read(struct drm_i915_private *i915, i915_reg_t reg)
> >> +{
> >> +       return intel_uncore_read(&i915->uncore, reg);
> >> +}
> >> +
> >> +static inline void
> >> +intel_de_posting_read(struct drm_i915_private *i915, i915_reg_t reg)
> >> +{
> >> +       intel_uncore_posting_read(&i915->uncore, reg);
> >> +}
> >> +
> >> +/* Note: read the warnings for intel_uncore_*_fw() functions! */
> >> +static inline u32
> >> +intel_de_read_fw(struct drm_i915_private *i915, i915_reg_t reg)
> >> +{
> >> +       return intel_uncore_read_fw(&i915->uncore, reg);
> >> +}
> >> +
> >> +static inline void
> >> +intel_de_write(struct drm_i915_private *i915, i915_reg_t reg, u32 val)
> >> +{
> >> +       intel_uncore_write(&i915->uncore, reg, val);
> >> +}
> >> +
> >> +/* Note: read the warnings for intel_uncore_*_fw() functions! */
> >> +static inline void
> >> +intel_de_write_fw(struct drm_i915_private *i915, i915_reg_t reg, u32 val)
> >> +{
> >> +       intel_uncore_write_fw(&i915->uncore, reg, val);
> >> +}
> >> +
> >> +static inline void
> >> +intel_de_rmw(struct drm_i915_private *i915, i915_reg_t reg, u32 clear, u32 set)
> >> +{
> >> +       intel_uncore_rmw(&i915->uncore, reg, clear, set);
> >> +}
> >> +
> >> +static inline int
> >> +intel_de_wait_for_register(struct drm_i915_private *i915, i915_reg_t reg,
> >> +                          u32 mask, u32 value, unsigned int timeout)
> >> +{
> >> +       return intel_wait_for_register(&i915->uncore, reg, mask, value, timeout);
> >> +}
> >> +
> >> +static inline int
> >> +intel_de_wait_for_set(struct drm_i915_private *i915, i915_reg_t reg,
> >> +                     u32 mask, unsigned int timeout)
> >> +{
> >> +       return intel_de_wait_for_register(i915, reg, mask, mask, timeout);
> >> +}
> >> +
> >> +static inline int
> >> +intel_de_wait_for_clear(struct drm_i915_private *i915, i915_reg_t reg,
> >> +                       u32 mask, unsigned int timeout)
> >> +{
> >> +       return intel_de_wait_for_register(i915, reg, mask, 0, timeout);
> >> +}
> >> +
> >> +#endif /* __INTEL_DE_H__ */
> >> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
> >> index 155ce49ae764..0d7adc2c167a 100644
> >> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> >> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> >> @@ -44,6 +44,7 @@
> >>  #include <media/cec-notifier.h>
> >>  
> >>  #include "i915_drv.h"
> >> +#include "intel_de.h"
> >
> > I don't think you want to include it from types.h though -- I think you
> > want to avoid inlines (at least inlines that depend upon external types)
> > away from the types.h so you can avoid the dreaded cycles.
> 
> Eventually yes, but I also don't want to splatter #include "intel_de.h"
> everywhere just yet... this seemed to fit the bill. ;)
> 
> > So other than that,
> > Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
> >
> > Or you may want to make the placement of the final include(s) a
> > separate patch.
> 
> Thanks for the review. Do you insist on a re-spin with the includes
> sorted out before merge?

Nope. So long as you are aware that the current placement can easily lead
into a trap, fine.
-Chris