On 20 December 2016 at 13:08, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> wrote:
> Add a late selftest that walks over all forcewake registers (those below
> 0x40000) and checks intel_uncore_forcewake_for_reg() that the look
> exists and we having the matching powerwells.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/selftests/intel_uncore.c | 47 +++++++++++++++++++++++++++
> 1 file changed, 47 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/selftests/intel_uncore.c b/drivers/gpu/drm/i915/selftests/intel_uncore.c
> index c18fddb12d00..c9f90514500f 100644
> --- a/drivers/gpu/drm/i915/selftests/intel_uncore.c
> +++ b/drivers/gpu/drm/i915/selftests/intel_uncore.c
> @@ -107,6 +107,49 @@ int intel_uncore_mock_selftests(void)
> return 0;
> }
>
> +static int intel_uncore_check_forcewake_domains(struct drm_i915_private *dev_priv)
> +{
> +#define FW_RANGE 0x40000
> + unsigned long *valid;
> + u32 offset;
> + int err;
> +
> + valid = kzalloc(BITS_TO_LONGS(FW_RANGE) * sizeof(*valid),
> + GFP_TEMPORARY);
> + if (!valid)
> + return -ENOMEM;
> +
> + intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
> +
> + check_for_unclaimed_mmio(dev_priv);
> + for (offset = 0; offset < FW_RANGE; offset += 4) {
> + i915_reg_t reg = { offset };
> +
> + (void)I915_READ_FW(reg);
> + if (!check_for_unclaimed_mmio(dev_priv))
> + set_bit(offset, valid);
> + }
> +
> + intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
> +
> + for_each_set_bit(offset, valid, FW_RANGE) {
> + i915_reg_t reg = { offset };
> +
> + intel_uncore_forcewake_reset(dev_priv, false);
> + check_for_unclaimed_mmio(dev_priv);
hmm, what do we need this for ?
> +
> + (void)I915_READ(reg);
> + if (check_for_unclaimed_mmio(dev_priv)) {
> + pr_err("Unclaimed mmio read to register 0x%04x\n",
> + offset);
> + err = -EINVAL;
> + }
> + }
> +
> + kfree(valid);
> + return err;
> +}
> +
> int intel_uncore_live_selftests(struct drm_i915_private *i915)
> {
> int err;
> @@ -118,5 +161,9 @@ int intel_uncore_live_selftests(struct drm_i915_private *i915)
> if (err)
> return err;
>
> + err = intel_uncore_check_forcewake_domains(i915);
> + if (err)
> + return err;
> +
> return 0;
> }
> --
> 2.11.0
>
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> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
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