From b212b79768ccde74429f872c37618c543fa11333 Mon Sep 17 00:00:00 2001 From: Janusz Krzysztofik Date: Mon, 11 Mar 2024 21:34:58 +0100 Subject: drm/i915/hwmon: Fix locking inversion in sysfs getter In i915 hwmon sysfs getter path we now take a hwmon_lock, then acquire an rpm wakeref. That results in lock inversion: <4> [197.079335] ====================================================== <4> [197.085473] WARNING: possible circular locking dependency detected <4> [197.091611] 6.8.0-rc7-Patchwork_129026v7-gc4dc92fb1152+ #1 Not tainted <4> [197.098096] ------------------------------------------------------ <4> [197.104231] prometheus-node/839 is trying to acquire lock: <4> [197.109680] ffffffff82764d80 (fs_reclaim){+.+.}-{0:0}, at: __kmalloc+0x9a/0x350 <4> [197.116939] but task is already holding lock: <4> [197.122730] ffff88811b772a40 (&hwmon->hwmon_lock){+.+.}-{3:3}, at: hwm_energy+0x4b/0x100 [i915] <4> [197.131543] which lock already depends on the new lock. ... <4> [197.507922] Chain exists of: fs_reclaim --> >->reset.mutex --> &hwmon->hwmon_lock <4> [197.518528] Possible unsafe locking scenario: <4> [197.524411] CPU0 CPU1 <4> [197.528916] ---- ---- <4> [197.533418] lock(&hwmon->hwmon_lock); <4> [197.537237] lock(>->reset.mutex); <4> [197.543376] lock(&hwmon->hwmon_lock); <4> [197.549682] lock(fs_reclaim); ... <4> [197.632548] Call Trace: <4> [197.634990] <4> [197.637088] dump_stack_lvl+0x64/0xb0 <4> [197.640738] check_noncircular+0x15e/0x180 <4> [197.652968] check_prev_add+0xe9/0xce0 <4> [197.656705] __lock_acquire+0x179f/0x2300 <4> [197.660694] lock_acquire+0xd8/0x2d0 <4> [197.673009] fs_reclaim_acquire+0xa1/0xd0 <4> [197.680478] __kmalloc+0x9a/0x350 <4> [197.689063] acpi_ns_internalize_name.part.0+0x4a/0xb0 <4> [197.694170] acpi_ns_get_node_unlocked+0x60/0xf0 <4> [197.720608] acpi_ns_get_node+0x3b/0x60 <4> [197.724428] acpi_get_handle+0x57/0xb0 <4> [197.728164] acpi_has_method+0x20/0x50 <4> [197.731896] acpi_pci_set_power_state+0x43/0x120 <4> [197.736485] pci_power_up+0x24/0x1c0 <4> [197.740047] pci_pm_default_resume_early+0x9/0x30 <4> [197.744725] pci_pm_runtime_resume+0x2d/0x90 <4> [197.753911] __rpm_callback+0x3c/0x110 <4> [197.762586] rpm_callback+0x58/0x70 <4> [197.766064] rpm_resume+0x51e/0x730 <4> [197.769542] rpm_resume+0x267/0x730 <4> [197.773020] rpm_resume+0x267/0x730 <4> [197.776498] rpm_resume+0x267/0x730 <4> [197.779974] __pm_runtime_resume+0x49/0x90 <4> [197.784055] __intel_runtime_pm_get+0x19/0xa0 [i915] <4> [197.789070] hwm_energy+0x55/0x100 [i915] <4> [197.793183] hwm_read+0x9a/0x310 [i915] <4> [197.797124] hwmon_attr_show+0x36/0x120 <4> [197.800946] dev_attr_show+0x15/0x60 <4> [197.804509] sysfs_kf_seq_show+0xb5/0x100 Acquire the wakeref before the lock and hold it as long as the lock is also held. Follow that pattern across the whole source file where similar lock inversion can happen. v2: Keep hardware read under the lock so the whole operation of updating energy from hardware is still atomic (Guenter), - instead, acquire the rpm wakeref before the lock and hold it as long as the lock is held, - use the same aproach for other similar places across the i915_hwmon.c source file (Rodrigo). Fixes: 1b44019a93e2 ("drm/i915/guc: Disable PL1 power limit when loading GuC firmware") Signed-off-by: Janusz Krzysztofik Cc: Rodrigo Vivi Cc: Guenter Roeck Cc: # v6.5+ Reviewed-by: Ashutosh Dixit Reviewed-by: Andi Shyti Signed-off-by: Andi Shyti Link: https://patchwork.freedesktop.org/patch/msgid/20240311203500.518675-2-janusz.krzysztofik@linux.intel.com (cherry picked from commit 71b218771426ea84c0e0148a2b7ac52c1f76e792) Signed-off-by: Rodrigo Vivi --- drivers/gpu/drm/i915/i915_hwmon.c | 37 +++++++++++++++++++------------------ 1 file changed, 19 insertions(+), 18 deletions(-) (limited to 'drivers/gpu/drm') diff --git a/drivers/gpu/drm/i915/i915_hwmon.c b/drivers/gpu/drm/i915/i915_hwmon.c index 8c3f443c8347..b758fd110c20 100644 --- a/drivers/gpu/drm/i915/i915_hwmon.c +++ b/drivers/gpu/drm/i915/i915_hwmon.c @@ -72,12 +72,13 @@ hwm_locked_with_pm_intel_uncore_rmw(struct hwm_drvdata *ddat, struct intel_uncore *uncore = ddat->uncore; intel_wakeref_t wakeref; - mutex_lock(&hwmon->hwmon_lock); + with_intel_runtime_pm(uncore->rpm, wakeref) { + mutex_lock(&hwmon->hwmon_lock); - with_intel_runtime_pm(uncore->rpm, wakeref) intel_uncore_rmw(uncore, reg, clear, set); - mutex_unlock(&hwmon->hwmon_lock); + mutex_unlock(&hwmon->hwmon_lock); + } } /* @@ -136,20 +137,21 @@ hwm_energy(struct hwm_drvdata *ddat, long *energy) else rgaddr = hwmon->rg.energy_status_all; - mutex_lock(&hwmon->hwmon_lock); + with_intel_runtime_pm(uncore->rpm, wakeref) { + mutex_lock(&hwmon->hwmon_lock); - with_intel_runtime_pm(uncore->rpm, wakeref) reg_val = intel_uncore_read(uncore, rgaddr); - if (reg_val >= ei->reg_val_prev) - ei->accum_energy += reg_val - ei->reg_val_prev; - else - ei->accum_energy += UINT_MAX - ei->reg_val_prev + reg_val; - ei->reg_val_prev = reg_val; + if (reg_val >= ei->reg_val_prev) + ei->accum_energy += reg_val - ei->reg_val_prev; + else + ei->accum_energy += UINT_MAX - ei->reg_val_prev + reg_val; + ei->reg_val_prev = reg_val; - *energy = mul_u64_u32_shr(ei->accum_energy, SF_ENERGY, - hwmon->scl_shift_energy); - mutex_unlock(&hwmon->hwmon_lock); + *energy = mul_u64_u32_shr(ei->accum_energy, SF_ENERGY, + hwmon->scl_shift_energy); + mutex_unlock(&hwmon->hwmon_lock); + } } static ssize_t @@ -404,6 +406,7 @@ hwm_power_max_write(struct hwm_drvdata *ddat, long val) /* Block waiting for GuC reset to complete when needed */ for (;;) { + wakeref = intel_runtime_pm_get(ddat->uncore->rpm); mutex_lock(&hwmon->hwmon_lock); prepare_to_wait(&ddat->waitq, &wait, TASK_INTERRUPTIBLE); @@ -417,14 +420,13 @@ hwm_power_max_write(struct hwm_drvdata *ddat, long val) } mutex_unlock(&hwmon->hwmon_lock); + intel_runtime_pm_put(ddat->uncore->rpm, wakeref); schedule(); } finish_wait(&ddat->waitq, &wait); if (ret) - goto unlock; - - wakeref = intel_runtime_pm_get(ddat->uncore->rpm); + goto exit; /* Disable PL1 limit and verify, because the limit cannot be disabled on all platforms */ if (val == PL1_DISABLE) { @@ -444,9 +446,8 @@ hwm_power_max_write(struct hwm_drvdata *ddat, long val) intel_uncore_rmw(ddat->uncore, hwmon->rg.pkg_rapl_limit, PKG_PWR_LIM_1_EN | PKG_PWR_LIM_1, nval); exit: - intel_runtime_pm_put(ddat->uncore->rpm, wakeref); -unlock: mutex_unlock(&hwmon->hwmon_lock); + intel_runtime_pm_put(ddat->uncore->rpm, wakeref); return ret; } -- cgit v1.2.3