On Tue, 29 May 2018, [email protected] wrote:
> From: Colin Xu <[email protected]>
>
> The existing way to update virtual PCH will return wrong PCH type
> in case the host doesn't have PCH:
> - intel_virt_detect_pch returns guessed PCH id 0
> - id 0 maps to PCH_NOP. >> should be PCH_NONE.
> Since PCH_NONE and PCH_NOP are different types, mixing them up
> will break vbt initialization logic.
>
> In addition, to add new none/nop PCH override for a specific
> platform, branching need to be added to intel_virt_detect_pch(),
> intel_pch_type() and the caller since none/nop PCH is not always
> mapping to the same predefined PCH id.
>
> This patch merges the virtual PCH update/sanity check logic into
> single function intel_virt_update_pch(), which still keeps using
> existing intel_pch_type() to do the sanity check, while making it
> clean to override virtual PCH id for a specific platform for future
> platform enablement.
Please keep the assignment out of intel_virt_{detect,update}_pch like. I
think the patch here is unnecessarily complicated.
BR,
Jani.
>
> Signed-off-by: Colin Xu <[email protected]>
> ---
> drivers/gpu/drm/i915/i915_drv.c | 56 ++++++++++++++++++---------------
> 1 file changed, 30 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index fb39e40c0847..637ba86104be 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -209,10 +209,11 @@ static bool intel_is_virt_pch(unsigned short id,
> sdevice == PCI_SUBDEVICE_ID_QEMU));
> }
>
> -static unsigned short
> -intel_virt_detect_pch(const struct drm_i915_private *dev_priv)
> +static void
> +intel_virt_update_pch(struct drm_i915_private *dev_priv)
> {
> unsigned short id = 0;
> + enum intel_pch pch_type = PCH_NONE;
>
> /*
> * In a virtualized passthrough environment we can be in a
> @@ -221,25 +222,37 @@ intel_virt_detect_pch(const struct drm_i915_private
> *dev_priv)
> * make an educated guess as to which PCH is really there.
> */
>
> - if (IS_GEN5(dev_priv))
> + if (IS_GEN5(dev_priv)) {
> id = INTEL_PCH_IBX_DEVICE_ID_TYPE;
> - else if (IS_GEN6(dev_priv) || IS_IVYBRIDGE(dev_priv))
> + pch_type = intel_pch_type(dev_priv, id);
> + DRM_DEBUG_KMS("Assuming Ibex Peak PCH id %04x\n", id);
> + } else if (IS_GEN6(dev_priv) || IS_IVYBRIDGE(dev_priv)) {
> id = INTEL_PCH_CPT_DEVICE_ID_TYPE;
> - else if (IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv))
> - id = INTEL_PCH_LPT_LP_DEVICE_ID_TYPE;
> - else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
> - id = INTEL_PCH_LPT_DEVICE_ID_TYPE;
> - else if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv))
> + pch_type = intel_pch_type(dev_priv, id);
> + DRM_DEBUG_KMS("Assuming CougarPoint PCH id %04x\n", id);
> + } else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
> + if (IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv))
> + id = INTEL_PCH_LPT_LP_DEVICE_ID_TYPE;
> + else
> + id = INTEL_PCH_LPT_DEVICE_ID_TYPE;
> + pch_type = intel_pch_type(dev_priv, id);
> + DRM_DEBUG_KMS("Assuming LynxPoint PCH id %04x\n", id);
> + } else if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv)) {
> id = INTEL_PCH_SPT_DEVICE_ID_TYPE;
> - else if (IS_COFFEELAKE(dev_priv) || IS_CANNONLAKE(dev_priv))
> + pch_type = intel_pch_type(dev_priv, id);
> + DRM_DEBUG_KMS("Assuming SunrisePoint PCH id %04x\n", id);
> + } else if (IS_COFFEELAKE(dev_priv) || IS_CANNONLAKE(dev_priv)) {
> id = INTEL_PCH_CNP_DEVICE_ID_TYPE;
> + pch_type = intel_pch_type(dev_priv, id);
> + DRM_DEBUG_KMS("Assuming CannonPoint PCH id %04x\n", id);
> + } else {
> + id = 0;
> + pch_type = PCH_NOP;
> + DRM_DEBUG_KMS("Assuming NOP PCH\n");
> + }
>
> - if (id)
> - DRM_DEBUG_KMS("Assuming PCH ID %04x\n", id);
> - else
> - DRM_DEBUG_KMS("Assuming no PCH\n");
> -
> - return id;
> + dev_priv->pch_type = pch_type;
> + dev_priv->pch_id = id;
> }
>
> static void intel_detect_pch(struct drm_i915_private *dev_priv)
> @@ -281,16 +294,7 @@ static void intel_detect_pch(struct drm_i915_private
> *dev_priv)
> break;
> } else if (intel_is_virt_pch(id, pch->subsystem_vendor,
> pch->subsystem_device)) {
> - id = intel_virt_detect_pch(dev_priv);
> - if (id) {
> - pch_type = intel_pch_type(dev_priv, id);
> - if (WARN_ON(pch_type == PCH_NONE))
> - pch_type = PCH_NOP;
> - } else {
> - pch_type = PCH_NOP;
> - }
> - dev_priv->pch_type = pch_type;
> - dev_priv->pch_id = id;
> + intel_virt_update_pch(dev_priv);
> break;
> }
> }
--
Jani Nikula, Intel Open Source Graphics Center
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