drm/i915/gt: Expose engine->mmio_base via sysfs

Use the per-engine sysfs directory to let userspace discover the
mmio_base of each engine. Prior to recent generations, the user
accessible registers on each engine are at a fixed offset relative to
each engine -- but require absolute addressing. As the absolute address
depends on the actual physical engine, this is not always possible to
determine from userspace (for example icl may expose vcs1 or vcs2 as the
second vcs engine). Make this easy for userspace to discover by
providing the mmio_base in sysfs.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Steve Carbonari <steven.carbonari@intel.com>
Tested-by: Steve Carbonari <steven.carbonari@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200228131716.3243616-2-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/gt/sysfs_engines.c b/drivers/gpu/drm/i915/gt/sysfs_engines.c
index 9552a78095ab3114758914b88e5829804b513f2c..81b5c90df5fc4eeb7a84825f8264d090290e57d5 100644 (file)
--- a/drivers/gpu/drm/i915/gt/sysfs_engines.c
+++ b/drivers/gpu/drm/i915/gt/sysfs_engines.c
@@ -47,6 +47,15 @@ inst_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
 static struct kobj_attribute inst_attr =
 __ATTR(instance, 0444, inst_show, NULL);
 
+static ssize_t
+mmio_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
+{
+       return sprintf(buf, "0x%x\n", kobj_to_engine(kobj)->mmio_base);
+}
+
+static struct kobj_attribute mmio_attr =
+__ATTR(mmio_base, 0444, mmio_show, NULL);
+
 static const char * const vcs_caps[] = {
        [ilog2(I915_VIDEO_CLASS_CAPABILITY_HEVC)] = "hevc",
        [ilog2(I915_VIDEO_AND_ENHANCE_CLASS_CAPABILITY_SFC)] = "sfc",
@@ -170,6 +179,7 @@ void intel_engines_add_sysfs(struct drm_i915_private *i915)
                &name_attr.attr,
                &class_attr.attr,
                &inst_attr.attr,
+               &mmio_attr.attr,
                &caps_attr.attr,
                &all_caps_attr.attr,
                NULL