From 2bc6b218717b9d08f466f88209251d54bc09b207 Mon Sep 17 00:00:00 2001 From: Fuad Tabba Date: Tue, 22 Sep 2026 19:14:30 +0100 Subject: arm64/boot: Disable trapping of PMZR_EL0 writes to EL2 __init_el2_fgt2() writes one mask to both HDFGRTR2_EL2 and HDFGWTR2_EL2. PMZR_EL0 is write-only, so its trap bit, nPMZR_EL0, exists only in HDFGWTR2_EL2 and is therefore never set: a PMZR_EL0 write from the host traps to EL2, where the nVHE hypervisor has no handler and BUG()s. The kernel never writes PMZR_EL0, but kernel.perf_user_access=1 has the PMU driver set PMUSERENR_EL0.UEN for a task with a user-read event, so a write from EL0 reaches the trap and takes the host down without a panic message. Accumulate the HDFGWTR2_EL2 bits separately, as __init_el2_fgt() already does for HDFGWTR_EL2, and set nPMZR_EL0 with the other FEAT_PMUv3p9 bits. Fixes: 858c7bfcb35e1 ("arm64/boot: Enable EL2 requirements for FEAT_PMUv3p9") Cc: stable@vger.kernel.org Signed-off-by: Fuad Tabba Reviewed-by: Anshuman Khandual Reviewed-by: Oliver Upton Signed-off-by: Will Deacon --- include/drm/drm_utils.h | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 include/drm/drm_utils.h (limited to 'include/drm/drm_utils.h') diff --git a/include/drm/drm_utils.h b/include/drm/drm_utils.h new file mode 100644 index 000000000..7e077484c --- /dev/null +++ b/include/drm/drm_utils.h @@ -0,0 +1,30 @@ +/* SPDX-License-Identifier: MIT */ +/* + * Function prototypes for misc. drm utility functions. + * Specifically this file is for function prototypes for functions which + * may also be used outside of drm code (e.g. in fbdev drivers). + * + * Copyright (C) 2017 Hans de Goede + */ + +#ifndef __DRM_UTILS_H__ +#define __DRM_UTILS_H__ + +#include + +struct drm_edid; + +int drm_get_panel_orientation_quirk(int width, int height); + +struct drm_panel_backlight_quirk { + u16 min_brightness; + u32 brightness_mask; + bool force_pwm; +}; + +const struct drm_panel_backlight_quirk * +drm_get_panel_backlight_quirk(const struct drm_edid *edid); + +signed long drm_timeout_abs_to_jiffies(int64_t timeout_nsec); + +#endif -- cgit v1.3.1