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12235da8c8
i915 will soon gain an eviction path that trylock a whole lot of locks for eviction, getting dmesg failures like below: BUG: MAX_LOCK_DEPTH too low! turning off the locking correctness validator. depth: 48 max: 48! 48 locks held by i915_selftest/5776: #0: ffff888101a79240 (&dev->mutex){....}-{3:3}, at: __driver_attach+0x88/0x160 #1: ffffc900009778c0 (reservation_ww_class_acquire){+.+.}-{0:0}, at: i915_vma_pin.constprop.63+0x39/0x1b0 [i915] #2: ffff88800cf74de8 (reservation_ww_class_mutex){+.+.}-{3:3}, at: i915_vma_pin.constprop.63+0x5f/0x1b0 [i915] #3: ffff88810c7f9e38 (&vm->mutex/1){+.+.}-{3:3}, at: i915_vma_pin_ww+0x1c4/0x9d0 [i915] #4: ffff88810bad5768 (reservation_ww_class_mutex){+.+.}-{3:3}, at: i915_gem_evict_something+0x110/0x860 [i915] #5: ffff88810bad60e8 (reservation_ww_class_mutex){+.+.}-{3:3}, at: i915_gem_evict_something+0x110/0x860 [i915] ... #46: ffff88811964d768 (reservation_ww_class_mutex){+.+.}-{3:3}, at: i915_gem_evict_something+0x110/0x860 [i915] #47: ffff88811964e0e8 (reservation_ww_class_mutex){+.+.}-{3:3}, at: i915_gem_evict_something+0x110/0x860 [i915] INFO: lockdep is turned off. Fixing eviction to nest into ww_class_acquire is a high priority, but it requires a rework of the entire driver, which can only be done one step at a time. As an intermediate solution, add an acquire context to ww_mutex_trylock, which allows us to do proper nesting annotations on the trylocks, making the above lockdep splat disappear. This is also useful in regulator_lock_nested, which may avoid dropping regulator_nesting_mutex in the uncontended path, so use it there. TTM may be another user for this, where we could lock a buffer in a fastpath with list locks held, without dropping all locks we hold. [peterz: rework actual ww_mutex_trylock() implementations] Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/YUBGPdDDjKlxAuXJ@hirez.programming.kicks-ass.net |
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| .. | ||
| 88pg86x.c | ||
| 88pm800-regulator.c | ||
| 88pm8607.c | ||
| aat2870-regulator.c | ||
| ab8500-ext.c | ||
| ab8500.c | ||
| act8865-regulator.c | ||
| act8945a-regulator.c | ||
| ad5398.c | ||
| anatop-regulator.c | ||
| arizona-ldo1.c | ||
| arizona-micsupp.c | ||
| as3711-regulator.c | ||
| as3722-regulator.c | ||
| atc260x-regulator.c | ||
| axp20x-regulator.c | ||
| bcm590xx-regulator.c | ||
| bd718x7-regulator.c | ||
| bd9571mwv-regulator.c | ||
| bd9576-regulator.c | ||
| bd71815-regulator.c | ||
| bd71828-regulator.c | ||
| core.c | ||
| cpcap-regulator.c | ||
| cros-ec-regulator.c | ||
| da903x-regulator.c | ||
| da9052-regulator.c | ||
| da9055-regulator.c | ||
| da9062-regulator.c | ||
| da9063-regulator.c | ||
| da9121-regulator.c | ||
| da9121-regulator.h | ||
| da9210-regulator.c | ||
| da9210-regulator.h | ||
| da9211-regulator.c | ||
| da9211-regulator.h | ||
| db8500-prcmu.c | ||
| dbx500-prcmu.c | ||
| dbx500-prcmu.h | ||
| devres.c | ||
| dummy.c | ||
| dummy.h | ||
| fan53555.c | ||
| fan53880.c | ||
| fixed-helper.c | ||
| fixed.c | ||
| gpio-regulator.c | ||
| helpers.c | ||
| hi655x-regulator.c | ||
| hi6421-regulator.c | ||
| hi6421v530-regulator.c | ||
| hi6421v600-regulator.c | ||
| internal.h | ||
| irq_helpers.c | ||
| isl6271a-regulator.c | ||
| isl9305.c | ||
| Kconfig | ||
| lm363x-regulator.c | ||
| lochnagar-regulator.c | ||
| lp872x.c | ||
| lp873x-regulator.c | ||
| lp3971.c | ||
| lp3972.c | ||
| lp8755.c | ||
| lp8788-buck.c | ||
| lp8788-ldo.c | ||
| lp87565-regulator.c | ||
| ltc3589.c | ||
| ltc3676.c | ||
| Makefile | ||
| max1586.c | ||
| max8649.c | ||
| max8660.c | ||
| max8893.c | ||
| max8907-regulator.c | ||
| max8925-regulator.c | ||
| max8952.c | ||
| max8973-regulator.c | ||
| max8997-regulator.c | ||
| max8998.c | ||
| max14577-regulator.c | ||
| max77620-regulator.c | ||
| max77650-regulator.c | ||
| max77686-regulator.c | ||
| max77693-regulator.c | ||
| max77802-regulator.c | ||
| max77826-regulator.c | ||
| mc13xxx-regulator-core.c | ||
| mc13xxx.h | ||
| mc13783-regulator.c | ||
| mc13892-regulator.c | ||
| mcp16502.c | ||
| mp886x.c | ||
| mp5416.c | ||
| mp8859.c | ||
| mpq7920.c | ||
| mpq7920.h | ||
| mt6311-regulator.c | ||
| mt6311-regulator.h | ||
| mt6315-regulator.c | ||
| mt6323-regulator.c | ||
| mt6358-regulator.c | ||
| mt6359-regulator.c | ||
| mt6360-regulator.c | ||
| mt6380-regulator.c | ||
| mt6397-regulator.c | ||
| mtk-dvfsrc-regulator.c | ||
| of_regulator.c | ||
| palmas-regulator.c | ||
| pbias-regulator.c | ||
| pca9450-regulator.c | ||
| pcap-regulator.c | ||
| pcf50633-regulator.c | ||
| pf8x00-regulator.c | ||
| pfuze100-regulator.c | ||
| pv88060-regulator.c | ||
| pv88060-regulator.h | ||
| pv88080-regulator.c | ||
| pv88080-regulator.h | ||
| pv88090-regulator.c | ||
| pv88090-regulator.h | ||
| pwm-regulator.c | ||
| qcom-labibb-regulator.c | ||
| qcom-rpmh-regulator.c | ||
| qcom_rpm-regulator.c | ||
| qcom_smd-regulator.c | ||
| qcom_spmi-regulator.c | ||
| qcom_usb_vbus-regulator.c | ||
| rc5t583-regulator.c | ||
| rk808-regulator.c | ||
| rn5t618-regulator.c | ||
| rohm-regulator.c | ||
| rpi-panel-attiny-regulator.c | ||
| rt4801-regulator.c | ||
| rt4831-regulator.c | ||
| rt5033-regulator.c | ||
| rt6160-regulator.c | ||
| rt6245-regulator.c | ||
| rtmv20-regulator.c | ||
| rtq2134-regulator.c | ||
| rtq6752-regulator.c | ||
| s2mpa01.c | ||
| s2mps11.c | ||
| s5m8767.c | ||
| sc2731-regulator.c | ||
| scmi-regulator.c | ||
| sky81452-regulator.c | ||
| slg51000-regulator.c | ||
| slg51000-regulator.h | ||
| stm32-booster.c | ||
| stm32-pwr.c | ||
| stm32-vrefbuf.c | ||
| stpmic1_regulator.c | ||
| stw481x-vmmc.c | ||
| sy7636a-regulator.c | ||
| sy8106a-regulator.c | ||
| sy8824x.c | ||
| sy8827n.c | ||
| ti-abb-regulator.c | ||
| tps6105x-regulator.c | ||
| tps6507x-regulator.c | ||
| tps6524x-regulator.c | ||
| tps6586x-regulator.c | ||
| tps51632-regulator.c | ||
| tps62360-regulator.c | ||
| tps65023-regulator.c | ||
| tps65086-regulator.c | ||
| tps65090-regulator.c | ||
| tps65132-regulator.c | ||
| tps65217-regulator.c | ||
| tps65218-regulator.c | ||
| tps65910-regulator.c | ||
| tps65912-regulator.c | ||
| tps80031-regulator.c | ||
| twl-regulator.c | ||
| twl6030-regulator.c | ||
| uniphier-regulator.c | ||
| userspace-consumer.c | ||
| vctrl-regulator.c | ||
| vexpress-regulator.c | ||
| virtual.c | ||
| vqmmc-ipq4019-regulator.c | ||
| wm831x-dcdc.c | ||
| wm831x-isink.c | ||
| wm831x-ldo.c | ||
| wm8350-regulator.c | ||
| wm8400-regulator.c | ||
| wm8994-regulator.c | ||