drm/i915/gt: make a gt sysfs group and move power management filesmultitile

The GT has its own properties and in sysfs they should be grouped
in the 'gt/' directory.

Create a 'gt/' directory in sysfs which will contain gt0...gtN
directories related to each tile configured in the GPU. Move the
power management files inside those directories.

The previous power management files are kept in their original
root directory to avoid breaking the ABI. They point to the tile
'0' and a warning message is printed whenever accessed to. The
deprecated interface needs for the CONFIG_SYSFS_DEPRECATED_V2
flag in order to be generated.

The new sysfs structure will have a similar layout for the 4 tile
case:

/sys/.../card0
         ├── gt
         │   ├── gt0
         │   │   ├── id
         │   │   ├── rc6_enable
         │   │   ├── rc6_residency_ms
         │   │   ├── rps_act_freq_mhz
         │   │   ├── rps_boost_freq_mhz
         │   │   ├── rps_cur_freq_mhz
         │   │   ├── rps_max_freq_mhz
         │   │   ├── rps_min_freq_mhz
         │   │   ├── rps_RP0_freq_mhz
         │   │   ├── rps_RP1_freq_mhz
         │   │   └── rps_RPn_freq_mhz
	 .   .
	 .   .
	 .   .
         │   └── gt3
         │       ├── id
         │       ├── rc6_enable
         │       ├── rc6_residency_ms
         │       ├── rps_act_freq_mhz
         │       ├── rps_boost_freq_mhz
         │       ├── rps_cur_freq_mhz
         │       ├── rps_max_freq_mhz
         │       ├── rps_min_freq_mhz
         │       ├── rps_RP0_freq_mhz
         │       ├── rps_RP1_freq_mhz
         │       └── rps_RPn_freq_mhz
         ├── gt_act_freq_mhz   -+
         ├── gt_boost_freq_mhz  |
         ├── gt_cur_freq_mhz    |    Original interface
         ├── gt_max_freq_mhz    +─-> kept as existing ABI;
         ├── gt_min_freq_mhz    |    it points to gt0/
         ├── gt_RP0_freq_mhz    |
         └── gt_RP1_freq_mhz    |
         └── gt_RPn_freq_mhz   -+

Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Sujaritha Sundaresan <sujaritha.sundaresan@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

1 files changed, 44 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/gt/sysfs_gt.h b/drivers/gpu/drm/i915/gt/sysfs_gt.h
new file mode 100644
index 000000000000..cd80a14bb14d
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/sysfs_gt.h
@@ -0,0 +1,44 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2020 Intel Corporation
+ */
+
+#ifndef __SYSFS_GT_H__
+#define __SYSFS_GT_H__
+
+#include <linux/ctype.h>
+#include <linux/kobject.h>
+
+#include "i915_gem.h" /* GEM_BUG_ON() */
+
+struct intel_gt;
+
+struct kobj_gt {
+	struct kobject base;
+	struct intel_gt *gt;
+};
+
+static inline bool is_object_gt(struct kobject *kobj)
+{
+	bool b = !strncmp(kobj->name, "gt", 2);
+
+	GEM_BUG_ON(b && !isdigit(kobj->name[2]));
+
+	return b;
+}
+
+struct kobject *
+intel_gt_create_kobj(struct intel_gt *gt,
+		     struct kobject *dir,
+		     const char *name);
+
+static inline struct intel_gt *kobj_to_gt(struct kobject *kobj)
+{
+	return container_of(kobj, struct kobj_gt, base)->gt;
+}
+
+void intel_gt_sysfs_register(struct intel_gt *gt);
+struct intel_gt *intel_gt_sysfs_get_drvdata(struct device *dev,
+					    const char *name);
+
+#endif /* SYSFS_GT_H */