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/video/broadsheetfb.h | 74 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 include/video/broadsheetfb.h (limited to 'include/video/broadsheetfb.h') diff --git a/include/video/broadsheetfb.h b/include/video/broadsheetfb.h new file mode 100644 index 000000000..548d28f4e --- /dev/null +++ b/include/video/broadsheetfb.h @@ -0,0 +1,74 @@ +/* + * broadsheetfb.h - definitions for the broadsheet framebuffer driver + * + * Copyright (C) 2008 by Jaya Kumar + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive for + * more details. + * + */ + +#ifndef _LINUX_BROADSHEETFB_H_ +#define _LINUX_BROADSHEETFB_H_ + +/* Broadsheet command defines */ +#define BS_CMD_INIT_SYS_RUN 0x06 +#define BS_CMD_INIT_DSPE_CFG 0x09 +#define BS_CMD_INIT_DSPE_TMG 0x0A +#define BS_CMD_INIT_ROTMODE 0x0B +#define BS_CMD_RD_REG 0x10 +#define BS_CMD_WR_REG 0x11 +#define BS_CMD_LD_IMG 0x20 +#define BS_CMD_LD_IMG_AREA 0x22 +#define BS_CMD_LD_IMG_END 0x23 +#define BS_CMD_WAIT_DSPE_TRG 0x28 +#define BS_CMD_WAIT_DSPE_FREND 0x29 +#define BS_CMD_RD_WFM_INFO 0x30 +#define BS_CMD_UPD_INIT 0x32 +#define BS_CMD_UPD_FULL 0x33 +#define BS_CMD_UPD_GDRV_CLR 0x37 + +/* Broadsheet register interface defines */ +#define BS_REG_REV 0x00 +#define BS_REG_PRC 0x02 + +/* Broadsheet pin interface specific defines */ +#define BS_CS 0x01 +#define BS_DC 0x02 +#define BS_WR 0x03 + +/* Broadsheet IO interface specific defines */ +#define BS_MMIO_CMD 0x01 +#define BS_MMIO_DATA 0x02 + +/* struct used by broadsheet. board specific stuff comes from *board */ +struct broadsheetfb_par { + struct fb_info *info; + struct broadsheet_board *board; + void (*write_reg)(struct broadsheetfb_par *, u16 reg, u16 val); + u16 (*read_reg)(struct broadsheetfb_par *, u16 reg); + wait_queue_head_t waitq; + int panel_index; + struct mutex io_lock; +}; + +/* board specific routines */ +struct broadsheet_board { + struct module *owner; + int (*init)(struct broadsheetfb_par *); + int (*wait_for_rdy)(struct broadsheetfb_par *); + void (*cleanup)(struct broadsheetfb_par *); + int (*get_panel_type)(void); + int (*setup_irq)(struct fb_info *); + + /* Functions for boards that use GPIO */ + void (*set_ctl)(struct broadsheetfb_par *, unsigned char, u8); + void (*set_hdb)(struct broadsheetfb_par *, u16); + u16 (*get_hdb)(struct broadsheetfb_par *); + + /* Functions for boards that have specialized MMIO */ + void (*mmio_write)(struct broadsheetfb_par *, int type, u16); + u16 (*mmio_read)(struct broadsheetfb_par *); +}; +#endif -- cgit v1.3.1