leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

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

Browse Source 
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
This commit is contained in:
Chris Wilson 2020-02-28 13:17:11 +00:00
parent 4ec76dbeb6
commit 6e57cc3942
1 changed files with 10 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/gpu/drm/i915/gt/sysfs_engines.c
View File

@ -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