Currently we shutdown rc6 during i915_gem_resume() but this is called during the preparation phase (i915_drm_prepare) for all suspend paths, but we only want to shutdown rc6 for S3+. Move the actual shutdown to i915_gem_suspend_late(). We then need to differentiate between suspend targets, to distinguish S0 (s2idle) where the device is kept awake but needs to be in a low power mode (the same as runtime suspend) from the device suspend levels where we lose control of HW and so must disable any HW access to dangling memory. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111909 Fixes: c113236718e8 ("drm/i915: Extract GT render sleep (rc6) management") Testcase: igt/gem_exec_suspend/power-S0 Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Cc: Andi Shyti <andi.shyti@xxxxxxxxx> --- drivers/gpu/drm/i915/gem/i915_gem_pm.c | 4 ++- drivers/gpu/drm/i915/gt/intel_gt_pm.c | 39 ++++++++++++++++++++---- drivers/gpu/drm/i915/gt/intel_gt_pm.h | 3 +- drivers/gpu/drm/i915/gt/intel_rc6.c | 5 +++ drivers/gpu/drm/i915/gt/selftest_gt_pm.c | 2 +- 5 files changed, 44 insertions(+), 9 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pm.c b/drivers/gpu/drm/i915/gem/i915_gem_pm.c index 6779ab34101b..f88ee1317bb4 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_pm.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_pm.c @@ -27,7 +27,7 @@ void i915_gem_suspend(struct drm_i915_private *i915) * state. Fortunately, the kernel_context is disposable and we do * not rely on its state. */ - intel_gt_suspend(&i915->gt); + intel_gt_suspend_prepare(&i915->gt); i915_gem_drain_freed_objects(i915); } @@ -69,6 +69,8 @@ void i915_gem_suspend_late(struct drm_i915_private *i915) * machine in an unusable condition. */ + intel_gt_suspend_late(&i915->gt); + spin_lock_irqsave(&i915->mm.obj_lock, flags); for (phase = phases; *phase; phase++) { LIST_HEAD(keep); diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.c b/drivers/gpu/drm/i915/gt/intel_gt_pm.c index 11661de8c40b..b60b2dfb4fea 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt_pm.c +++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.c @@ -4,6 +4,8 @@ * Copyright © 2019 Intel Corporation */ +#include <linux/suspend.h> + #include "i915_drv.h" #include "i915_globals.h" #include "i915_params.h" @@ -236,8 +238,13 @@ int intel_gt_resume(struct intel_gt *gt) return err; } -static void wait_for_idle(struct intel_gt *gt) +void intel_gt_suspend_prepare(struct intel_gt *gt) { + if (!intel_gt_pm_is_awake(gt)) + return; + + user_forcewake(gt, true); + if (intel_gt_wait_for_idle(gt, I915_GEM_IDLE_TIMEOUT) == -ETIME) { /* * Forcibly cancel outstanding work and leave @@ -247,18 +254,38 @@ static void wait_for_idle(struct intel_gt *gt) } intel_gt_pm_wait_for_idle(gt); + + intel_uc_suspend(>->uc); } -void intel_gt_suspend(struct intel_gt *gt) +static suspend_state_t pm_suspend_target(void) { - intel_wakeref_t wakeref; +#if IS_ENABLED(CONFIG_PM_SLEEP) + return pm_suspend_target_state; +#else + return PM_SUSPEND_TO_IDLE; +#endif +} - user_forcewake(gt, true); +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_idle(gt); + intel_gt_suspend_prepare(gt); - intel_uc_suspend(>->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(>->rps); diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.h b/drivers/gpu/drm/i915/gt/intel_gt_pm.h index d924c984c74d..b3e17399be9b 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt_pm.h +++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.h @@ -43,8 +43,9 @@ void intel_gt_pm_fini(struct intel_gt *gt); void intel_gt_sanitize(struct intel_gt *gt, bool force); +void intel_gt_suspend_prepare(struct intel_gt *gt); +void intel_gt_suspend_late(struct intel_gt *gt); int intel_gt_resume(struct intel_gt *gt); -void intel_gt_suspend(struct intel_gt *gt); void intel_gt_runtime_suspend(struct intel_gt *gt); int intel_gt_runtime_resume(struct intel_gt *gt); diff --git a/drivers/gpu/drm/i915/gt/intel_rc6.c b/drivers/gpu/drm/i915/gt/intel_rc6.c index 70f0e01a38b9..5ad4a92a9582 100644 --- a/drivers/gpu/drm/i915/gt/intel_rc6.c +++ b/drivers/gpu/drm/i915/gt/intel_rc6.c @@ -525,6 +525,11 @@ void intel_rc6_init(struct intel_rc6 *rc6) void intel_rc6_sanitize(struct intel_rc6 *rc6) { + if (rc6->enabled) { /* unbalanced suspend/resume */ + rpm_get(rc6); + rc6->enabled = false; + } + if (rc6->supported) __intel_rc6_disable(rc6); } diff --git a/drivers/gpu/drm/i915/gt/selftest_gt_pm.c b/drivers/gpu/drm/i915/gt/selftest_gt_pm.c index 5d429037cdad..3d4e6a008af8 100644 --- a/drivers/gpu/drm/i915/gt/selftest_gt_pm.c +++ b/drivers/gpu/drm/i915/gt/selftest_gt_pm.c @@ -15,7 +15,7 @@ static int live_gt_resume(void *arg) /* Do several suspend/resume cycles to check we don't explode! */ do { - intel_gt_suspend(gt); + intel_gt_suspend_late(gt); if (gt->rc6.enabled) { pr_err("rc6 still enabled after suspend!\n"); -- 2.24.0.rc1 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
