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/uapi/sound/fcp.h | 120 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 120 insertions(+) create mode 100644 include/uapi/sound/fcp.h (limited to 'include/uapi/sound/fcp.h') diff --git a/include/uapi/sound/fcp.h b/include/uapi/sound/fcp.h new file mode 100644 index 000000000..aea428956 --- /dev/null +++ b/include/uapi/sound/fcp.h @@ -0,0 +1,120 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +/* + * Focusrite Control Protocol Driver for ALSA + * + * Copyright (c) 2024-2025 by Geoffrey D. Bennett + */ +/* + * DOC: FCP (Focusrite Control Protocol) User-Space API + * + * This header defines the interface between the FCP kernel driver and + * user-space programs to enable the use of the proprietary features + * available in Focusrite USB audio interfaces. This includes Scarlett + * 2nd Gen, 3rd Gen, 4th Gen, Clarett USB, Clarett+, and Vocaster + * series devices. + * + * The interface is provided via ALSA's hwdep interface. Opening the + * hwdep device requires CAP_SYS_RAWIO privileges as this interface + * provides near-direct access. + * + * For details on the FCP protocol, refer to the kernel scarlett2 + * driver in sound/usb/mixer_scarlett2.c and the fcp-support project + * at https://github.com/geoffreybennett/fcp-support + * + * For examples of using these IOCTLs, see the fcp-server source in + * the fcp-support project. + * + * IOCTL Interface + * -------------- + * FCP_IOCTL_PVERSION: + * Returns the protocol version supported by the driver. + * + * FCP_IOCTL_INIT: + * Initialises the protocol and synchronises sequence numbers + * between the driver and device. Must be called at least once + * before sending commands. Can be safely called again at any time. + * + * FCP_IOCTL_CMD: + * Sends an FCP command to the device and returns the response. + * Requires prior initialisation via FCP_IOCTL_INIT. + * + * FCP_IOCTL_SET_METER_MAP: + * Configures the Level Meter control's mapping between device + * meters and control channels. Requires FCP_IOCTL_INIT to have been + * called first. The map size and number of slots cannot be changed + * after initial configuration, although the map itself can be + * updated. Once configured, the Level Meter remains functional even + * after the hwdep device is closed. + * + * FCP_IOCTL_SET_METER_LABELS: + * Set the labels for the Level Meter control. Requires + * FCP_IOCTL_SET_METER_MAP to have been called first. labels[] + * should contain a sequence of null-terminated labels corresponding + * to the control's channels. + */ +#ifndef __UAPI_SOUND_FCP_H +#define __UAPI_SOUND_FCP_H + +#include +#include + +#define FCP_HWDEP_MAJOR 2 +#define FCP_HWDEP_MINOR 0 +#define FCP_HWDEP_SUBMINOR 0 + +#define FCP_HWDEP_VERSION \ + ((FCP_HWDEP_MAJOR << 16) | \ + (FCP_HWDEP_MINOR << 8) | \ + FCP_HWDEP_SUBMINOR) + +#define FCP_HWDEP_VERSION_MAJOR(v) (((v) >> 16) & 0xFF) +#define FCP_HWDEP_VERSION_MINOR(v) (((v) >> 8) & 0xFF) +#define FCP_HWDEP_VERSION_SUBMINOR(v) ((v) & 0xFF) + +/* Get protocol version */ +#define FCP_IOCTL_PVERSION _IOR('S', 0x60, int) + +/* Start the protocol */ + +/* Step 0 and step 2 responses are variable length and placed in + * resp[] one after the other. + */ +struct fcp_init { + __u16 step0_resp_size; + __u16 step2_resp_size; + __u32 init1_opcode; + __u32 init2_opcode; + __u8 resp[]; +} __attribute__((packed)); + +#define FCP_IOCTL_INIT _IOWR('S', 0x64, struct fcp_init) + +/* Perform a command */ + +/* The request data is placed in data[] and the response data will + * overwrite it. + */ +struct fcp_cmd { + __u32 opcode; + __u16 req_size; + __u16 resp_size; + __u8 data[]; +} __attribute__((packed)); +#define FCP_IOCTL_CMD _IOWR('S', 0x65, struct fcp_cmd) + +/* Set the meter map */ +struct fcp_meter_map { + __u16 map_size; + __u16 meter_slots; + __s16 map[]; +} __attribute__((packed)); +#define FCP_IOCTL_SET_METER_MAP _IOW('S', 0x66, struct fcp_meter_map) + +/* Set the meter labels */ +struct fcp_meter_labels { + __u16 labels_size; + char labels[]; +} __attribute__((packed)); +#define FCP_IOCTL_SET_METER_LABELS _IOW('S', 0x67, struct fcp_meter_labels) + +#endif /* __UAPI_SOUND_FCP_H */ -- cgit v1.3.1