[Intel-gfx] [PATCH v3 3/8] drm/i915: add new helpers for accessing stepping info

[Jani Nikula]

Add new runtime info field for stepping. Add new helpers for accessing
them. As we'll be switching platforms over to the new scheme
incrementally, check for non-initialized steppings.

In case a platform does not have separate display and gt steppings, it's
okay to use a common shorthand. However, in this case the display
stepping must not be initialized, and gt stepping is the single point of
truth.

v2: Rename stepping->step

Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h          | 24 +++++++++++++++---------
 drivers/gpu/drm/i915/intel_device_info.h |  4 ++++
 drivers/gpu/drm/i915/intel_step.h        | 14 ++++++++++++++
 3 files changed, 33 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 02170edd6628..a543b1ad9ba9 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1274,6 +1274,21 @@ static inline struct drm_i915_private *pdev_to_i915(struct pci_dev *pdev)
 #define IS_REVID(p, since, until) \
 	(INTEL_REVID(p) >= (since) && INTEL_REVID(p) <= (until))
 
+#define INTEL_DISPLAY_STEP(__i915) (RUNTIME_INFO(__i915)->step.disp_stepping)
+#define INTEL_GT_STEP(__i915) (RUNTIME_INFO(__i915)->step.gt_stepping)
+
+#define IS_DISPLAY_STEP(__i915, since, until) \
+	(drm_WARN_ON(&(__i915)->drm, INTEL_DISPLAY_STEP(__i915) == STEP_NONE), \
+	 INTEL_DISPLAY_STEP(__i915) >= (since) && INTEL_DISPLAY_STEP(__i915) <= (until))
+
+#define IS_GT_STEP(__i915, since, until) \
+	(drm_WARN_ON(&(__i915)->drm, INTEL_GT_STEP(__i915) == STEP_NONE), \
+	 INTEL_GT_STEP(__i915) >= (since) && INTEL_GT_STEP(__i915) <= (until))
+
+#define IS_STEP(p, since, until) \
+	(drm_WARN_ON(&(__i915)->drm, INTEL_DISPLAY_STEP(__i915) != STEP_NONE), \
+	 INTEL_GT_STEP(__i915, since, until))
+
 static __always_inline unsigned int
 __platform_mask_index(const struct intel_runtime_info *info,
 		      enum intel_platform p)
@@ -1511,15 +1526,6 @@ enum {
 #define IS_JSL_EHL_REVID(p, since, until) \
 	(IS_JSL_EHL(p) && IS_REVID(p, since, until))
 
-enum {
-	STEP_A0,
-	STEP_A2,
-	STEP_B0,
-	STEP_B1,
-	STEP_C0,
-	STEP_D0,
-};
-
 static inline const struct i915_rev_steppings *
 tgl_stepping_get(struct drm_i915_private *dev_priv)
 {
diff --git a/drivers/gpu/drm/i915/intel_device_info.h b/drivers/gpu/drm/i915/intel_device_info.h
index d44f64b57b7a..f84569e8e711 100644
--- a/drivers/gpu/drm/i915/intel_device_info.h
+++ b/drivers/gpu/drm/i915/intel_device_info.h
@@ -27,6 +27,8 @@
 
 #include <uapi/drm/i915_drm.h>
 
+#include "intel_step.h"
+
 #include "display/intel_display.h"
 
 #include "gt/intel_engine_types.h"
@@ -225,6 +227,8 @@ struct intel_runtime_info {
 	u8 num_scalers[I915_MAX_PIPES];
 
 	u32 rawclk_freq;
+
+	struct i915_rev_steppings step;
 };
 
 struct intel_driver_caps {
diff --git a/drivers/gpu/drm/i915/intel_step.h b/drivers/gpu/drm/i915/intel_step.h
index af922ae3bb4e..8b3ef19d935b 100644
--- a/drivers/gpu/drm/i915/intel_step.h
+++ b/drivers/gpu/drm/i915/intel_step.h
@@ -22,4 +22,18 @@ extern const struct i915_rev_steppings tgl_uy_revid_step_tbl[TGL_UY_REVID_STEP_T
 extern const struct i915_rev_steppings tgl_revid_step_tbl[TGL_REVID_STEP_TBL_SIZE];
 extern const struct i915_rev_steppings adls_revid_step_tbl[ADLS_REVID_STEP_TBL_SIZE];
 
+/*
+ * Symbolic steppings that do not match the hardware. These are valid both as gt
+ * and display steppings as symbolic names.
+ */
+enum intel_step {
+	STEP_NONE = 0,
+	STEP_A0,
+	STEP_A2,
+	STEP_B0,
+	STEP_B1,
+	STEP_C0,
+	STEP_D0,
+};
+
 #endif /* __INTEL_STEP_H__ */
-- 
2.20.1