/* * Copyright (c) 2010 Google, Inc * Copyright (c) 2014 NVIDIA Corporation * * Author: * Colin Cross * * This software is licensed under the terms of the GNU General Public * License version 2, as published by the Free Software Foundation, and * may be copied, distributed, and modified under those terms. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * */ #ifndef __SOC_TEGRA_PMC_H__ #define __SOC_TEGRA_PMC_H__ #include #include struct clk; struct reset_control; #ifdef CONFIG_PM_SLEEP enum tegra_suspend_mode tegra_pmc_get_suspend_mode(void); void tegra_pmc_set_suspend_mode(enum tegra_suspend_mode mode); void tegra_pmc_enter_suspend_mode(enum tegra_suspend_mode mode); #endif /* CONFIG_PM_SLEEP */ #ifdef CONFIG_SMP bool tegra_pmc_cpu_is_powered(unsigned int cpuid); int tegra_pmc_cpu_power_on(unsigned int cpuid); int tegra_pmc_cpu_remove_clamping(unsigned int cpuid); #endif /* CONFIG_SMP */ /* * powergate and I/O rail APIs */ #define TEGRA_POWERGATE_CPU 0 #define TEGRA_POWERGATE_3D 1 #define TEGRA_POWERGATE_VENC 2 #define TEGRA_POWERGATE_PCIE 3 #define TEGRA_POWERGATE_VDEC 4 #define TEGRA_POWERGATE_L2 5 #define TEGRA_POWERGATE_MPE 6 #define TEGRA_POWERGATE_HEG 7 #define TEGRA_POWERGATE_SATA 8 #define TEGRA_POWERGATE_CPU1 9 #define TEGRA_POWERGATE_CPU2 10 #define TEGRA_POWERGATE_CPU3 11 #define TEGRA_POWERGATE_CELP 12 #define TEGRA_POWERGATE_3D1 13 #define TEGRA_POWERGATE_CPU0 14 #define TEGRA_POWERGATE_C0NC 15 #define TEGRA_POWERGATE_C1NC 16 #define TEGRA_POWERGATE_SOR 17 #define TEGRA_POWERGATE_DIS 18 #define TEGRA_POWERGATE_DISB 19 #define TEGRA_POWERGATE_XUSBA 20 #define TEGRA_POWERGATE_XUSBB 21 #define TEGRA_POWERGATE_XUSBC 22 #define TEGRA_POWERGATE_VIC 23 #define TEGRA_POWERGATE_IRAM 24 #define TEGRA_POWERGATE_NVDEC 25 #define TEGRA_POWERGATE_NVJPG 26 #define TEGRA_POWERGATE_AUD 27 #define TEGRA_POWERGATE_DFD 28 #define TEGRA_POWERGATE_VE2 29 #define TEGRA_POWERGATE_MAX TEGRA_POWERGATE_VE2 #define TEGRA_POWERGATE_3D0 TEGRA_POWERGATE_3D /** * enum tegra_io_pad - I/O pad group identifier * * I/O pins on Tegra SoCs are grouped into so-called I/O pads. Each such pad * can be used to control the common voltage signal level and power state of * the pins of the given pad. */ enum tegra_io_pad { TEGRA_IO_PAD_AUDIO, TEGRA_IO_PAD_AUDIO_HV, TEGRA_IO_PAD_BB, TEGRA_IO_PAD_CAM, TEGRA_IO_PAD_COMP, TEGRA_IO_PAD_CSIA, TEGRA_IO_PAD_CSIB, TEGRA_IO_PAD_CSIC, TEGRA_IO_PAD_CSID, TEGRA_IO_PAD_CSIE, TEGRA_IO_PAD_CSIF, TEGRA_IO_PAD_DBG, TEGRA_IO_PAD_DEBUG_NONAO, TEGRA_IO_PAD_DMIC, TEGRA_IO_PAD_DP, TEGRA_IO_PAD_DSI, TEGRA_IO_PAD_DSIB, TEGRA_IO_PAD_DSIC, TEGRA_IO_PAD_DSID, TEGRA_IO_PAD_EMMC, TEGRA_IO_PAD_EMMC2, TEGRA_IO_PAD_GPIO, TEGRA_IO_PAD_HDMI, TEGRA_IO_PAD_HSIC, TEGRA_IO_PAD_HV, TEGRA_IO_PAD_LVDS, TEGRA_IO_PAD_MIPI_BIAS, TEGRA_IO_PAD_NAND, TEGRA_IO_PAD_PEX_BIAS, TEGRA_IO_PAD_PEX_CLK1, TEGRA_IO_PAD_PEX_CLK2, TEGRA_IO_PAD_PEX_CNTRL, TEGRA_IO_PAD_SDMMC1, TEGRA_IO_PAD_SDMMC3, TEGRA_IO_PAD_SDMMC4, TEGRA_IO_PAD_SPI, TEGRA_IO_PAD_SPI_HV, TEGRA_IO_PAD_SYS_DDC, TEGRA_IO_PAD_UART, TEGRA_IO_PAD_USB0, TEGRA_IO_PAD_USB1, TEGRA_IO_PAD_USB2, TEGRA_IO_PAD_USB3, TEGRA_IO_PAD_USB_BIAS, }; /* deprecated, use TEGRA_IO_PAD_{HDMI,LVDS} instead */ #define TEGRA_IO_RAIL_HDMI TEGRA_IO_PAD_HDMI #define TEGRA_IO_RAIL_LVDS TEGRA_IO_PAD_LVDS /** * enum tegra_io_pad_voltage - voltage level of the I/O pad's source rail * @TEGRA_IO_PAD_1800000UV: 1.8 V * @TEGRA_IO_PAD_3300000UV: 3.3 V */ enum tegra_io_pad_voltage { TEGRA_IO_PAD_1800000UV, TEGRA_IO_PAD_3300000UV, }; #ifdef CONFIG_ARCH_TEGRA int tegra_powergate_is_powered(unsigned int id); int tegra_powergate_power_on(unsigned int id); int tegra_powergate_power_off(unsigned int id); int tegra_powergate_remove_clamping(unsigned int id); /* Must be called with clk disabled, and returns with clk enabled */ int tegra_powergate_sequence_power_up(unsigned int id, struct clk *clk, struct reset_control *rst); int tegra_io_pad_power_enable(enum tegra_io_pad id); int tegra_io_pad_power_disable(enum tegra_io_pad id); int tegra_io_pad_set_voltage(enum tegra_io_pad id, enum tegra_io_pad_voltage voltage); int tegra_io_pad_get_voltage(enum tegra_io_pad id); /* deprecated, use tegra_io_pad_power_{enable,disable}() instead */ int tegra_io_rail_power_on(unsigned int id); int tegra_io_rail_power_off(unsigned int id); #else static inline int tegra_powergate_is_powered(unsigned int id) { return -ENOSYS; } static inline int tegra_powergate_power_on(unsigned int id) { return -ENOSYS; } static inline int tegra_powergate_power_off(unsigned int id) { return -ENOSYS; } static inline int tegra_powergate_remove_clamping(unsigned int id) { return -ENOSYS; } static inline int tegra_powergate_sequence_power_up(unsigned int id, struct clk *clk, struct reset_control *rst) { return -ENOSYS; } static inline int tegra_io_pad_power_enable(enum tegra_io_pad id) { return -ENOSYS; } static inline int tegra_io_pad_power_disable(enum tegra_io_pad id) { return -ENOSYS; } static inline int tegra_io_pad_set_voltage(enum tegra_io_pad id, enum tegra_io_pad_voltage voltage) { return -ENOSYS; } static inline int tegra_io_pad_get_voltage(enum tegra_io_pad id) { return -ENOSYS; } static inline int tegra_io_rail_power_on(unsigned int id) { return -ENOSYS; } static inline int tegra_io_rail_power_off(unsigned int id) { return -ENOSYS; } #endif /* CONFIG_ARCH_TEGRA */ #endif /* __SOC_TEGRA_PMC_H__ */ /linux/net-next.git/diff/drivers?h=nds-private-remove&id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e&id2=2c5d9555d6d937966d79d4c6529a5f7b9206e405'>diff)
drm/i915: Check for NULL i915_vma in intel_unpin_fb_obj()
I've seen this trigger twice now, where the i915_gem_object_to_ggtt() call in intel_unpin_fb_obj() returns NULL, resulting in an oops immediately afterwards as the (inlined) call to i915_vma_unpin_fence() tries to dereference it. It seems to be some race condition where the object is going away at shutdown time, since both times happened when shutting down the X server. The call chains were different: - VT ioctl(KDSETMODE, KD_TEXT): intel_cleanup_plane_fb+0x5b/0xa0 [i915] drm_atomic_helper_cleanup_planes+0x6f/0x90 [drm_kms_helper] intel_atomic_commit_tail+0x749/0xfe0 [i915] intel_atomic_commit+0x3cb/0x4f0 [i915] drm_atomic_commit+0x4b/0x50 [drm] restore_fbdev_mode+0x14c/0x2a0 [drm_kms_helper] drm_fb_helper_restore_fbdev_mode_unlocked+0x34/0x80 [drm_kms_helper] drm_fb_helper_set_par+0x2d/0x60 [drm_kms_helper] intel_fbdev_set_par+0x18/0x70 [i915] fb_set_var+0x236/0x460 fbcon_blank+0x30f/0x350 do_unblank_screen+0xd2/0x1a0 vt_ioctl+0x507/0x12a0 tty_ioctl+0x355/0xc30 do_vfs_ioctl+0xa3/0x5e0 SyS_ioctl+0x79/0x90 entry_SYSCALL_64_fastpath+0x13/0x94 - i915 unpin_work workqueue: intel_unpin_work_fn+0x58/0x140 [i915] process_one_work+0x1f1/0x480 worker_thread+0x48/0x4d0 kthread+0x101/0x140 and this patch purely papers over the issue by adding a NULL pointer check and a WARN_ON_ONCE() to avoid the oops that would then generally make the machine unresponsive. Other callers of i915_gem_object_to_ggtt() seem to also check for the returned pointer being NULL and warn about it, so this clearly has happened before in other places. [ Reported it originally to the i915 developers on Jan 8, applying the ugly workaround on my own now after triggering the problem for the second time with no feedback. This is likely to be the same bug reported as https://bugs.freedesktop.org/show_bug.cgi?id=98829 https://bugs.freedesktop.org/show_bug.cgi?id=99134 which has a patch for the underlying problem, but it hasn't gotten to me, so I'm applying the workaround. ] Cc: Daniel Vetter <daniel.vetter@intel.com> Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Imre Deak <imre.deak@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')