From 9f229de252a9092ce9ecad26433b0a00f80af0ca Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Fri, 28 Feb 2020 13:17:11 +0000
Subject: drm/i915/gt: Expose engine->mmio_base via sysfs
Git-commit: 6e57cc39420c1d13d92c46ea662a7f9f5368f2ee
Patch-mainline: v5.7-rc1
References: jsc#SLE-12680, jsc#SLE-12880, jsc#SLE-12882, jsc#SLE-12883, jsc#SLE-13496, jsc#SLE-15322
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
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/i915/gt/sysfs_engines.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/gpu/drm/i915/gt/sysfs_engines.c b/drivers/gpu/drm/i915/gt/sysfs_engines.c
index 9552a78095ab..81b5c90df5fc 100644
--- 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
--
2.28.0