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// SPDX-License-Identifier: MIT
/*
* Copyright © 2023 Intel Corporation
*/
#include <drm/drm_managed.h>
#include "xe_device.h"
#include "xe_gt.h"
#include "xe_gt_idle.h"
#include "xe_gt_sysfs.h"
#include "xe_guc_pc.h"
#include "regs/xe_gt_regs.h"
#include "xe_mmio.h"
/**
* DOC: Xe GT Idle
*
* Contains functions that init GT idle features like C6
*
* device/gt#/gtidle/name - name of the state
* device/gt#/gtidle/idle_residency_ms - Provides residency of the idle state in ms
* device/gt#/gtidle/idle_status - Provides current idle state
*/
static struct xe_gt_idle *dev_to_gtidle(struct device *dev)
{
struct kobject *kobj = &dev->kobj;
return &kobj_to_gt(kobj->parent)->gtidle;
}
static struct xe_gt *gtidle_to_gt(struct xe_gt_idle *gtidle)
{
return container_of(gtidle, struct xe_gt, gtidle);
}
static struct xe_guc_pc *gtidle_to_pc(struct xe_gt_idle *gtidle)
{
return >idle_to_gt(gtidle)->uc.guc.pc;
}
static const char *gt_idle_state_to_string(enum xe_gt_idle_state state)
{
switch (state) {
case GT_IDLE_C0:
return "gt-c0";
case GT_IDLE_C6:
return "gt-c6";
default:
return "unknown";
}
}
static u64 get_residency_ms(struct xe_gt_idle *gtidle, u64 cur_residency)
{
u64 delta, overflow_residency, prev_residency;
overflow_residency = BIT_ULL(32);
/*
* Counter wrap handling
* Store previous hw counter values for counter wrap-around handling
* Relying on sufficient frequency of queries otherwise counters can still wrap.
*/
prev_residency = gtidle->prev_residency;
gtidle->prev_residency = cur_residency;
/* delta */
if (cur_residency >= prev_residency)
delta = cur_residency - prev_residency;
else
delta = cur_residency + (overflow_residency - prev_residency);
/* Add delta to extended raw driver copy of idle residency */
cur_residency = gtidle->cur_residency + delta;
gtidle->cur_residency = cur_residency;
/* residency multiplier in ns, convert to ms */
cur_residency = mul_u64_u32_div(cur_residency, gtidle->residency_multiplier, 1e6);
return cur_residency;
}
static ssize_t name_show(struct device *dev,
struct device_attribute *attr, char *buff)
{
struct xe_gt_idle *gtidle = dev_to_gtidle(dev);
return sysfs_emit(buff, "%s\n", gtidle->name);
}
static DEVICE_ATTR_RO(name);
static ssize_t idle_status_show(struct device *dev,
struct device_attribute *attr, char *buff)
{
struct xe_gt_idle *gtidle = dev_to_gtidle(dev);
struct xe_guc_pc *pc = gtidle_to_pc(gtidle);
enum xe_gt_idle_state state;
state = gtidle->idle_status(pc);
return sysfs_emit(buff, "%s\n", gt_idle_state_to_string(state));
}
static DEVICE_ATTR_RO(idle_status);
static ssize_t idle_residency_ms_show(struct device *dev,
struct device_attribute *attr, char *buff)
{
struct xe_gt_idle *gtidle = dev_to_gtidle(dev);
struct xe_guc_pc *pc = gtidle_to_pc(gtidle);
u64 residency;
residency = gtidle->idle_residency(pc);
return sysfs_emit(buff, "%llu\n", get_residency_ms(gtidle, residency));
}
static DEVICE_ATTR_RO(idle_residency_ms);
static const struct attribute *gt_idle_attrs[] = {
&dev_attr_name.attr,
&dev_attr_idle_status.attr,
&dev_attr_idle_residency_ms.attr,
NULL,
};
static void gt_idle_sysfs_fini(struct drm_device *drm, void *arg)
{
struct kobject *kobj = arg;
sysfs_remove_files(kobj, gt_idle_attrs);
kobject_put(kobj);
}
void xe_gt_idle_sysfs_init(struct xe_gt_idle *gtidle)
{
struct xe_gt *gt = gtidle_to_gt(gtidle);
struct xe_device *xe = gt_to_xe(gt);
struct kobject *kobj;
int err;
kobj = kobject_create_and_add("gtidle", gt->sysfs);
if (!kobj) {
drm_warn(&xe->drm, "%s failed, err: %d\n", __func__, -ENOMEM);
return;
}
if (xe_gt_is_media_type(gt)) {
sprintf(gtidle->name, "gt%d-mc", gt->info.id);
gtidle->idle_residency = xe_guc_pc_mc6_residency;
} else {
sprintf(gtidle->name, "gt%d-rc", gt->info.id);
gtidle->idle_residency = xe_guc_pc_rc6_residency;
}
/* Multiplier for Residency counter in units of 1.28us */
gtidle->residency_multiplier = 1280;
gtidle->idle_status = xe_guc_pc_c_status;
err = sysfs_create_files(kobj, gt_idle_attrs);
if (err) {
kobject_put(kobj);
drm_warn(&xe->drm, "failed to register gtidle sysfs, err: %d\n", err);
return;
}
err = drmm_add_action_or_reset(&xe->drm, gt_idle_sysfs_fini, kobj);
if (err)
drm_warn(&xe->drm, "%s: drmm_add_action_or_reset failed, err: %d\n",
__func__, err);
}
void xe_gt_idle_enable_c6(struct xe_gt *gt)
{
xe_device_assert_mem_access(gt_to_xe(gt));
xe_force_wake_assert_held(gt_to_fw(gt), XE_FW_GT);
/* Units of 1280 ns for a total of 5s */
xe_mmio_write32(gt, RC_IDLE_HYSTERSIS, 0x3B9ACA);
/* Enable RC6 */
xe_mmio_write32(gt, RC_CONTROL,
RC_CTL_HW_ENABLE | RC_CTL_TO_MODE | RC_CTL_RC6_ENABLE);
}
void xe_gt_idle_disable_c6(struct xe_gt *gt)
{
xe_device_assert_mem_access(gt_to_xe(gt));
xe_force_wake_assert_held(gt_to_fw(gt), XE_FORCEWAKE_ALL);
xe_mmio_write32(gt, PG_ENABLE, 0);
xe_mmio_write32(gt, RC_CONTROL, 0);
xe_mmio_write32(gt, RC_STATE, 0);
}
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