drm/i915: Remove i915.semaphores modparam

Having disabled the broken semaphores on Sandybridge, there is no need
for a modparam any more, so remove it in favour of a simple
HAS_LEGACY_SEMAPHORES() guard.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171120205504.21892-5-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_drv.c

@@ -321,7 +321,7 @@ static int i915_getparam(struct drm_device *dev, void *data,
 		value = USES_PPGTT(dev_priv);
 		break;
 	case I915_PARAM_HAS_SEMAPHORES:
-		value = i915_modparams.semaphores;
+		value = HAS_LEGACY_SEMAPHORES(dev_priv);
 		break;
 	case I915_PARAM_HAS_SECURE_BATCHES:
 		value = capable(CAP_SYS_ADMIN);
@@ -1063,11 +1063,6 @@ static void intel_sanitize_options(struct drm_i915_private *dev_priv)
 					    i915_modparams.enable_ppgtt);
 	DRM_DEBUG_DRIVER("ppgtt mode: %i\n", i915_modparams.enable_ppgtt);
 
-	i915_modparams.semaphores =
-		intel_sanitize_semaphores(dev_priv, i915_modparams.semaphores);
-	DRM_DEBUG_DRIVER("use GPU semaphores? %s\n",
-			 yesno(i915_modparams.semaphores));
-
 	intel_uc_sanitize_options(dev_priv);
 
 	intel_gvt_sanitize_options(dev_priv);

drivers/gpu/drm/i915/i915_drv.h

@@ -3139,6 +3139,8 @@ intel_info(const struct drm_i915_private *dev_priv)
 #define HAS_BLT(dev_priv)	HAS_ENGINE(dev_priv, BCS)
 #define HAS_VEBOX(dev_priv)	HAS_ENGINE(dev_priv, VECS)
 
+#define HAS_LEGACY_SEMAPHORES(dev_priv) IS_GEN7(dev_priv)
+
 #define HAS_LLC(dev_priv)	((dev_priv)->info.has_llc)
 #define HAS_SNOOP(dev_priv)	((dev_priv)->info.has_snoop)
 #define HAS_EDRAM(dev_priv)	(!!((dev_priv)->edram_cap & EDRAM_ENABLED))
@@ -3302,8 +3304,6 @@ intel_ggtt_update_needs_vtd_wa(struct drm_i915_private *dev_priv)
 int intel_sanitize_enable_ppgtt(struct drm_i915_private *dev_priv,
 				int enable_ppgtt);
 
-bool intel_sanitize_semaphores(struct drm_i915_private *dev_priv, int value);
-
 /* i915_drv.c */
 void __printf(3, 4)
 __i915_printk(struct drm_i915_private *dev_priv, const char *level,

drivers/gpu/drm/i915/i915_gem.c

@@ -4997,17 +4997,6 @@ int i915_gem_init_hw(struct drm_i915_private *dev_priv)
 	return ret;
 }
 
-bool intel_sanitize_semaphores(struct drm_i915_private *dev_priv, int value)
-{
-	if (!IS_GEN7(dev_priv))
-		return false;
-
-	if (value >= 0)
-		return value;
-
-	return true;
-}
-
 static int __intel_engines_record_defaults(struct drm_i915_private *i915)
 {
 	struct i915_gem_context *ctx;

drivers/gpu/drm/i915/i915_gem_context.c

@@ -574,7 +574,7 @@ mi_set_context(struct drm_i915_gem_request *req, u32 flags)
 	enum intel_engine_id id;
 	const int num_rings =
 		/* Use an extended w/a on gen7 if signalling from other rings */
-		(i915_modparams.semaphores && IS_GEN7(dev_priv)) ?
+		(HAS_LEGACY_SEMAPHORES(dev_priv) && IS_GEN7(dev_priv)) ?
 		INTEL_INFO(dev_priv)->num_rings - 1 :
 		0;
 	int len;

drivers/gpu/drm/i915/i915_params.c

@@ -46,10 +46,6 @@ i915_param_named_unsafe(panel_ignore_lid, int, 0600,
 	"Override lid status (0=autodetect, 1=autodetect disabled [default], "
 	"-1=force lid closed, -2=force lid open)");
 
-i915_param_named_unsafe(semaphores, int, 0400,
-	"Use semaphores for inter-ring sync "
-	"(default: -1 (use per-chip defaults))");
-
 i915_param_named_unsafe(enable_rc6, int, 0400,
 	"Enable power-saving render C-state 6. "
 	"Different stages can be selected via bitmask values "

drivers/gpu/drm/i915/i915_params.h

@@ -31,7 +31,6 @@
 	param(char *, vbt_firmware, NULL) \
 	param(int, modeset, -1) \
 	param(int, panel_ignore_lid, 1) \
-	param(int, semaphores, -1) \
 	param(int, lvds_channel_mode, 0) \
 	param(int, panel_use_ssc, -1) \
 	param(int, vbt_sdvo_panel_type, -1) \

drivers/gpu/drm/i915/intel_engine_cs.c

@@ -1713,7 +1713,7 @@ void intel_engine_dump(struct intel_engine_cs *engine, struct drm_printer *m)
 			   I915_READ(RING_MI_MODE(engine->mmio_base)),
 			   I915_READ(RING_MI_MODE(engine->mmio_base)) & (MODE_IDLE) ? " [idle]" : "");
 	}
-	if (i915_modparams.semaphores) {
+	if (HAS_LEGACY_SEMAPHORES(dev_priv)) {
 		drm_printf(m, "\tSYNC_0: 0x%08x\n",
 			   I915_READ(RING_SYNC_0(engine->mmio_base)));
 		drm_printf(m, "\tSYNC_1: 0x%08x\n",

drivers/gpu/drm/i915/intel_ringbuffer.c

@@ -1712,7 +1712,7 @@ static void intel_ring_init_semaphores(struct drm_i915_private *dev_priv,
 {
 	int i;
 
-	if (!i915_modparams.semaphores)
+	if (!HAS_LEGACY_SEMAPHORES(dev_priv))
 		return;
 
 	GEM_BUG_ON(INTEL_GEN(dev_priv) < 6);
@@ -1823,7 +1823,7 @@ static void intel_ring_default_vfuncs(struct drm_i915_private *dev_priv,
 
 	engine->emit_breadcrumb = i9xx_emit_breadcrumb;
 	engine->emit_breadcrumb_sz = i9xx_emit_breadcrumb_sz;
-	if (i915_modparams.semaphores) {
+	if (HAS_LEGACY_SEMAPHORES(dev_priv)) {
 		int num_rings;
 
 		engine->emit_breadcrumb = gen6_sema_emit_breadcrumb;