drm/i915: Introduce HAS_64BIT_RELOC

Move has_64bit_reloc into dev_priv->info. This will make it visible
in the feature listing debug output.

v2:
- Keep the struct member to keep GCC fragile but happy (Chris)
v3:
- More detailed commit message (Chris)
- Include forgotten CHV and BXT (Chris)

Cc: Chris Wilson <[e-mail]>
Signed-off-by: Joonas Lahtinen <[e-mail]>
Reviewed-by: Chris Wilson <[e-mail]>
Link: http://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/i915/i915_drv.h

···
 	func(is_kabylake); \
 	func(is_preliminary); \
 	/* Keep has_* in alphabetical order */ \
+	func(has_64bit_reloc); \
 	func(has_csr); \
 	func(has_ddi); \
 	func(has_dp_mst); \
···
 #define HAS_CSR(dev)	(INTEL_INFO(dev)->has_csr)
 
 #define HAS_RUNTIME_PM(dev_priv) ((dev_priv)->info.has_runtime_pm)
+#define HAS_64BIT_RELOC(dev_priv) ((dev_priv)->info.has_64bit_reloc)
+
 /*
  * For now, anything with a GuC requires uCode loading, and then supports
  * command submission once loaded. But these are logically independent

drivers/gpu/drm/i915/i915_gem_execbuffer.c

···
 	cache->page = -1;
 	cache->vaddr = 0;
 	cache->i915 = i915;
-	cache->use_64bit_reloc = INTEL_GEN(cache->i915) >= 8;
+	/* Must be a variable in the struct to allow GCC to unroll. */
+	cache->use_64bit_reloc = HAS_64BIT_RELOC(i915);
 	cache->node.allocated = false;
 }
 

drivers/gpu/drm/i915/i915_gem_render_state.c

···
 			      struct drm_i915_private *i915)
 {
 	const struct intel_renderstate_rodata *rodata = so->rodata;
-	const bool has_64bit_reloc = INTEL_GEN(i915) >= 8;
 	struct drm_i915_gem_object *obj = so->vma->obj;
 	unsigned int i = 0, reloc_index = 0;
 	unsigned int needs_clflush;
···
 		if (i * 4  == rodata->reloc[reloc_index]) {
 			u64 r = s + so->vma->node.start;
 			s = lower_32_bits(r);
-			if (has_64bit_reloc) {
+			if (HAS_64BIT_RELOC(i915)) {
 				if (i + 1 >= rodata->batch_items ||
 				    rodata->batch[i + 1] != 0)
 					goto err;

drivers/gpu/drm/i915/i915_pci.c

···
 #define BDW_FEATURES \
 	HSW_FEATURES, \
 	BDW_COLORS, \
-	.has_logical_ring_contexts = 1
+	.has_logical_ring_contexts = 1, \
+	.has_64bit_reloc = 1
 
 static const struct intel_device_info intel_broadwell_info = {
 	BDW_FEATURES,
···
 	.has_hotplug = 1,
 	.ring_mask = RENDER_RING | BSD_RING | BLT_RING | VEBOX_RING,
 	.is_cherryview = 1,
+	.has_64bit_reloc = 1,
 	.has_psr = 1,
 	.has_runtime_pm = 1,
 	.has_resource_streamer = 1,
···
 	.has_hotplug = 1,
 	.ring_mask = RENDER_RING | BSD_RING | BLT_RING | VEBOX_RING,
 	.num_pipes = 3,
+	.has_64bit_reloc = 1,
 	.has_ddi = 1,
 	.has_fpga_dbg = 1,
 	.has_fbc = 1,