diff options
Diffstat (limited to 'drivers/gpu/drm/xe/xe_gt_idle.c')
| -rw-r--r-- | drivers/gpu/drm/xe/xe_gt_idle.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xe/xe_gt_idle.c b/drivers/gpu/drm/xe/xe_gt_idle.c new file mode 100644 index 000000000000..9358f7336889 --- /dev/null +++ b/drivers/gpu/drm/xe/xe_gt_idle.c @@ -0,0 +1,192 @@ +// 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\n", gt->info.id); + gtidle->idle_residency = xe_guc_pc_mc6_residency; + } else { + sprintf(gtidle->name, "gt%d-rc\n", 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); +} |