1 files changed, 408 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.c b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
new file mode 100644
index 0000000000..5a942af0a1
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
@@ -0,0 +1,408 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2019 Intel Corporation
+ */
+
+#include <linux/string_helpers.h>
+#include <linux/suspend.h>
+
+#include "i915_drv.h"
+#include "i915_irq.h"
+#include "i915_params.h"
+#include "intel_context.h"
+#include "intel_engine_pm.h"
+#include "intel_gt.h"
+#include "intel_gt_clock_utils.h"
+#include "intel_gt_pm.h"
+#include "intel_gt_print.h"
+#include "intel_gt_requests.h"
+#include "intel_llc.h"
+#include "intel_rc6.h"
+#include "intel_rps.h"
+#include "intel_wakeref.h"
+#include "pxp/intel_pxp_pm.h"
+
+#define I915_GT_SUSPEND_IDLE_TIMEOUT (HZ / 2)
+
+static void user_forcewake(struct intel_gt *gt, bool suspend)
+{
+	int count = atomic_read(&gt->user_wakeref);
+
+	/* Inside suspend/resume so single threaded, no races to worry about. */
+	if (likely(!count))
+		return;
+
+	intel_gt_pm_get(gt);
+	if (suspend) {
+		GEM_BUG_ON(count > atomic_read(&gt->wakeref.count));
+		atomic_sub(count, &gt->wakeref.count);
+	} else {
+		atomic_add(count, &gt->wakeref.count);
+	}
+	intel_gt_pm_put(gt);
+}
+
+static void runtime_begin(struct intel_gt *gt)
+{
+	local_irq_disable();
+	write_seqcount_begin(&gt->stats.lock);
+	gt->stats.start = ktime_get();
+	gt->stats.active = true;
+	write_seqcount_end(&gt->stats.lock);
+	local_irq_enable();
+}
+
+static void runtime_end(struct intel_gt *gt)
+{
+	local_irq_disable();
+	write_seqcount_begin(&gt->stats.lock);
+	gt->stats.active = false;
+	gt->stats.total =
+		ktime_add(gt->stats.total,
+			  ktime_sub(ktime_get(), gt->stats.start));
+	write_seqcount_end(&gt->stats.lock);
+	local_irq_enable();
+}
+
+static int __gt_unpark(struct intel_wakeref *wf)
+{
+	struct intel_gt *gt = container_of(wf, typeof(*gt), wakeref);
+	struct drm_i915_private *i915 = gt->i915;
+
+	GT_TRACE(gt, "\n");
+
+	/*
+	 * It seems that the DMC likes to transition between the DC states a lot
+	 * when there are no connected displays (no active power domains) during
+	 * command submission.
+	 *
+	 * This activity has negative impact on the performance of the chip with
+	 * huge latencies observed in the interrupt handler and elsewhere.
+	 *
+	 * Work around it by grabbing a GT IRQ power domain whilst there is any
+	 * GT activity, preventing any DC state transitions.
+	 */
+	gt->awake = intel_display_power_get(i915, POWER_DOMAIN_GT_IRQ);
+	GEM_BUG_ON(!gt->awake);
+
+	intel_rc6_unpark(&gt->rc6);
+	intel_rps_unpark(&gt->rps);
+	i915_pmu_gt_unparked(gt);
+	intel_guc_busyness_unpark(gt);
+
+	intel_gt_unpark_requests(gt);
+	runtime_begin(gt);
+
+	return 0;
+}
+
+static int __gt_park(struct intel_wakeref *wf)
+{
+	struct intel_gt *gt = container_of(wf, typeof(*gt), wakeref);
+	intel_wakeref_t wakeref = fetch_and_zero(&gt->awake);
+	struct drm_i915_private *i915 = gt->i915;
+
+	GT_TRACE(gt, "\n");
+
+	runtime_end(gt);
+	intel_gt_park_requests(gt);
+
+	intel_guc_busyness_park(gt);
+	i915_vma_parked(gt);
+	i915_pmu_gt_parked(gt);
+	intel_rps_park(&gt->rps);
+	intel_rc6_park(&gt->rc6);
+
+	/* Everything switched off, flush any residual interrupt just in case */
+	intel_synchronize_irq(i915);
+
+	/* Defer dropping the display power well for 100ms, it's slow! */
+	GEM_BUG_ON(!wakeref);
+	intel_display_power_put_async(i915, POWER_DOMAIN_GT_IRQ, wakeref);
+
+	return 0;
+}
+
+static const struct intel_wakeref_ops wf_ops = {
+	.get = __gt_unpark,
+	.put = __gt_park,
+};
+
+void intel_gt_pm_init_early(struct intel_gt *gt)
+{
+	/*
+	 * We access the runtime_pm structure via gt->i915 here rather than
+	 * gt->uncore as we do elsewhere in the file because gt->uncore is not
+	 * yet initialized for all tiles at this point in the driver startup.
+	 * runtime_pm is per-device rather than per-tile, so this is still the
+	 * correct structure.
+	 */
+	intel_wakeref_init(&gt->wakeref, gt->i915, &wf_ops);
+	seqcount_mutex_init(&gt->stats.lock, &gt->wakeref.mutex);
+}
+
+void intel_gt_pm_init(struct intel_gt *gt)
+{
+	/*
+	 * Enabling power-management should be "self-healing". If we cannot
+	 * enable a feature, simply leave it disabled with a notice to the
+	 * user.
+	 */
+	intel_rc6_init(&gt->rc6);
+	intel_rps_init(&gt->rps);
+}
+
+static bool reset_engines(struct intel_gt *gt)
+{
+	if (INTEL_INFO(gt->i915)->gpu_reset_clobbers_display)
+		return false;
+
+	return __intel_gt_reset(gt, ALL_ENGINES) == 0;
+}
+
+static void gt_sanitize(struct intel_gt *gt, bool force)
+{
+	struct intel_engine_cs *engine;
+	enum intel_engine_id id;
+	intel_wakeref_t wakeref;
+
+	GT_TRACE(gt, "force:%s", str_yes_no(force));
+
+	/* Use a raw wakeref to avoid calling intel_display_power_get early */
+	wakeref = intel_runtime_pm_get(gt->uncore->rpm);
+	intel_uncore_forcewake_get(gt->uncore, FORCEWAKE_ALL);
+
+	intel_gt_check_clock_frequency(gt);
+
+	/*
+	 * As we have just resumed the machine and woken the device up from
+	 * deep PCI sleep (presumably D3_cold), assume the HW has been reset
+	 * back to defaults, recovering from whatever wedged state we left it
+	 * in and so worth trying to use the device once more.
+	 */
+	if (intel_gt_is_wedged(gt))
+		intel_gt_unset_wedged(gt);
+
+	/* For GuC mode, ensure submission is disabled before stopping ring */
+	intel_uc_reset_prepare(&gt->uc);
+
+	for_each_engine(engine, gt, id) {
+		if (engine->reset.prepare)
+			engine->reset.prepare(engine);
+
+		if (engine->sanitize)
+			engine->sanitize(engine);
+	}
+
+	if (reset_engines(gt) || force) {
+		for_each_engine(engine, gt, id)
+			__intel_engine_reset(engine, false);
+	}
+
+	intel_uc_reset(&gt->uc, false);
+
+	for_each_engine(engine, gt, id)
+		if (engine->reset.finish)
+			engine->reset.finish(engine);
+
+	intel_rps_sanitize(&gt->rps);
+
+	intel_uncore_forcewake_put(gt->uncore, FORCEWAKE_ALL);
+	intel_runtime_pm_put(gt->uncore->rpm, wakeref);
+}
+
+void intel_gt_pm_fini(struct intel_gt *gt)
+{
+	intel_rc6_fini(&gt->rc6);
+}
+
+int intel_gt_resume(struct intel_gt *gt)
+{
+	struct intel_engine_cs *engine;
+	enum intel_engine_id id;
+	int err;
+
+	err = intel_gt_has_unrecoverable_error(gt);
+	if (err)
+		return err;
+
+	GT_TRACE(gt, "\n");
+
+	/*
+	 * After resume, we may need to poke into the pinned kernel
+	 * contexts to paper over any damage caused by the sudden suspend.
+	 * Only the kernel contexts should remain pinned over suspend,
+	 * allowing us to fixup the user contexts on their first pin.
+	 */
+	gt_sanitize(gt, true);
+
+	intel_gt_pm_get(gt);
+
+	intel_uncore_forcewake_get(gt->uncore, FORCEWAKE_ALL);
+	intel_rc6_sanitize(&gt->rc6);
+	if (intel_gt_is_wedged(gt)) {
+		err = -EIO;
+		goto out_fw;
+	}
+
+	/* Only when the HW is re-initialised, can we replay the requests */
+	err = intel_gt_init_hw(gt);
+	if (err) {
+		gt_probe_error(gt, "Failed to initialize GPU, declaring it wedged!\n");
+		goto err_wedged;
+	}
+
+	intel_uc_reset_finish(&gt->uc);
+
+	intel_rps_enable(&gt->rps);
+	intel_llc_enable(&gt->llc);
+
+	for_each_engine(engine, gt, id) {
+		intel_engine_pm_get(engine);
+
+		engine->serial++; /* kernel context lost */
+		err = intel_engine_resume(engine);
+
+		intel_engine_pm_put(engine);
+		if (err) {
+			gt_err(gt, "Failed to restart %s (%d)\n",
+			       engine->name, err);
+			goto err_wedged;
+		}
+	}
+
+	intel_rc6_enable(&gt->rc6);
+
+	intel_uc_resume(&gt->uc);
+
+	user_forcewake(gt, false);
+
+out_fw:
+	intel_uncore_forcewake_put(gt->uncore, FORCEWAKE_ALL);
+	intel_gt_pm_put(gt);
+	return err;
+
+err_wedged:
+	intel_gt_set_wedged(gt);
+	goto out_fw;
+}
+
+static void wait_for_suspend(struct intel_gt *gt)
+{
+	if (!intel_gt_pm_is_awake(gt))
+		return;
+
+	if (intel_gt_wait_for_idle(gt, I915_GT_SUSPEND_IDLE_TIMEOUT) == -ETIME) {
+		/*
+		 * Forcibly cancel outstanding work and leave
+		 * the gpu quiet.
+		 */
+		intel_gt_set_wedged(gt);
+		intel_gt_retire_requests(gt);
+	}
+
+	intel_gt_pm_wait_for_idle(gt);
+}
+
+void intel_gt_suspend_prepare(struct intel_gt *gt)
+{
+	user_forcewake(gt, true);
+	wait_for_suspend(gt);
+}
+
+static suspend_state_t pm_suspend_target(void)
+{
+#if IS_ENABLED(CONFIG_SUSPEND) && IS_ENABLED(CONFIG_PM_SLEEP)
+	return pm_suspend_target_state;
+#else
+	return PM_SUSPEND_TO_IDLE;
+#endif
+}
+
+void intel_gt_suspend_late(struct intel_gt *gt)
+{
+	intel_wakeref_t wakeref;
+
+	/* We expect to be idle already; but also want to be independent */
+	wait_for_suspend(gt);
+
+	if (is_mock_gt(gt))
+		return;
+
+	GEM_BUG_ON(gt->awake);
+
+	intel_uc_suspend(&gt->uc);
+
+	/*
+	 * On disabling the device, we want to turn off HW access to memory
+	 * that we no longer own.
+	 *
+	 * However, not all suspend-states disable the device. S0 (s2idle)
+	 * is effectively runtime-suspend, the device is left powered on
+	 * but needs to be put into a low power state. We need to keep
+	 * powermanagement enabled, but we also retain system state and so
+	 * it remains safe to keep on using our allocated memory.
+	 */
+	if (pm_suspend_target() == PM_SUSPEND_TO_IDLE)
+		return;
+
+	with_intel_runtime_pm(gt->uncore->rpm, wakeref) {
+		intel_rps_disable(&gt->rps);
+		intel_rc6_disable(&gt->rc6);
+		intel_llc_disable(&gt->llc);
+	}
+
+	gt_sanitize(gt, false);
+
+	GT_TRACE(gt, "\n");
+}
+
+void intel_gt_runtime_suspend(struct intel_gt *gt)
+{
+	intel_uc_runtime_suspend(&gt->uc);
+
+	GT_TRACE(gt, "\n");
+}
+
+int intel_gt_runtime_resume(struct intel_gt *gt)
+{
+	int ret;
+
+	GT_TRACE(gt, "\n");
+	intel_gt_init_swizzling(gt);
+	intel_ggtt_restore_fences(gt->ggtt);
+
+	ret = intel_uc_runtime_resume(&gt->uc);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static ktime_t __intel_gt_get_awake_time(const struct intel_gt *gt)
+{
+	ktime_t total = gt->stats.total;
+
+	if (gt->stats.active)
+		total = ktime_add(total,
+				  ktime_sub(ktime_get(), gt->stats.start));
+
+	return total;
+}
+
+ktime_t intel_gt_get_awake_time(const struct intel_gt *gt)
+{
+	unsigned int seq;
+	ktime_t total;
+
+	do {
+		seq = read_seqcount_begin(&gt->stats.lock);
+		total = __intel_gt_get_awake_time(gt);
+	} while (read_seqcount_retry(&gt->stats.lock, seq));
+
+	return total;
+}
+
+#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
+#include "selftest_gt_pm.c"
+#endif