arm64/boot: Disable trapping of PMZR_EL0 writes to EL2grafted

__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 <fuad.tabba@linux.dev>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Reviewed-by: Oliver Upton <oupton@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>

1 files changed, 114 insertions, 0 deletions

diff --git a/drivers/input/mouse/sentelic.h b/drivers/input/mouse/sentelic.h
new file mode 100644
index 000000000..02cac0e7a
--- /dev/null
+++ b/drivers/input/mouse/sentelic.h
@@ -0,0 +1,114 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*-
+ * Finger Sensing Pad PS/2 mouse driver.
+ *
+ * Copyright (C) 2005-2007 Asia Vital Components Co., Ltd.
+ * Copyright (C) 2005-2012 Tai-hwa Liang, Sentelic Corporation.
+ */
+
+#ifndef	__SENTELIC_H
+#define	__SENTELIC_H
+
+/* Finger-sensing Pad information registers */
+#define	FSP_REG_DEVICE_ID	0x00
+#define	FSP_REG_VERSION		0x01
+#define	FSP_REG_REVISION	0x04
+#define	FSP_REG_TMOD_STATUS1	0x0B
+#define	FSP_BIT_NO_ROTATION	BIT(3)
+#define	FSP_REG_PAGE_CTRL	0x0F
+
+/* Finger-sensing Pad control registers */
+#define	FSP_REG_SYSCTL1		0x10
+#define	FSP_BIT_EN_REG_CLK	BIT(5)
+#define	FSP_REG_TMOD_STATUS	0x20
+#define	FSP_REG_OPC_QDOWN	0x31
+#define	FSP_BIT_EN_OPC_TAG	BIT(7)
+#define	FSP_REG_OPTZ_XLO	0x34
+#define	FSP_REG_OPTZ_XHI	0x35
+#define	FSP_REG_OPTZ_YLO	0x36
+#define	FSP_REG_OPTZ_YHI	0x37
+#define	FSP_REG_SYSCTL5		0x40
+#define	FSP_BIT_90_DEGREE	BIT(0)
+#define	FSP_BIT_EN_MSID6	BIT(1)
+#define	FSP_BIT_EN_MSID7	BIT(2)
+#define	FSP_BIT_EN_MSID8	BIT(3)
+#define	FSP_BIT_EN_AUTO_MSID8	BIT(5)
+#define	FSP_BIT_EN_PKT_G0	BIT(6)
+
+#define	FSP_REG_ONPAD_CTL	0x43
+#define	FSP_BIT_ONPAD_ENABLE	BIT(0)
+#define	FSP_BIT_ONPAD_FBBB	BIT(1)
+#define	FSP_BIT_FIX_VSCR	BIT(3)
+#define	FSP_BIT_FIX_HSCR	BIT(5)
+#define	FSP_BIT_DRAG_LOCK	BIT(6)
+
+#define	FSP_REG_SWC1		(0x90)
+#define	FSP_BIT_SWC1_EN_ABS_1F	BIT(0)
+#define	FSP_BIT_SWC1_EN_GID	BIT(1)
+#define	FSP_BIT_SWC1_EN_ABS_2F	BIT(2)
+#define	FSP_BIT_SWC1_EN_FUP_OUT	BIT(3)
+#define	FSP_BIT_SWC1_EN_ABS_CON	BIT(4)
+#define	FSP_BIT_SWC1_GST_GRP0	BIT(5)
+#define	FSP_BIT_SWC1_GST_GRP1	BIT(6)
+#define	FSP_BIT_SWC1_BX_COMPAT	BIT(7)
+
+#define	FSP_PAGE_0B		(0x0b)
+#define	FSP_PAGE_82		(0x82)
+#define	FSP_PAGE_DEFAULT	FSP_PAGE_82
+
+#define	FSP_REG_SN0		(0x40)
+#define	FSP_REG_SN1		(0x41)
+#define	FSP_REG_SN2		(0x42)
+
+/* Finger-sensing Pad packet formating related definitions */
+
+/* absolute packet type */
+#define	FSP_PKT_TYPE_NORMAL	(0x00)
+#define	FSP_PKT_TYPE_ABS	(0x01)
+#define	FSP_PKT_TYPE_NOTIFY	(0x02)
+#define	FSP_PKT_TYPE_NORMAL_OPC	(0x03)
+#define	FSP_PKT_TYPE_SHIFT	(6)
+
+/* bit definitions for the first byte of report packet */
+#define	FSP_PB0_LBTN		BIT(0)
+#define	FSP_PB0_RBTN		BIT(1)
+#define	FSP_PB0_MBTN		BIT(2)
+#define	FSP_PB0_MFMC_FGR2	FSP_PB0_MBTN
+#define	FSP_PB0_MUST_SET	BIT(3)
+#define	FSP_PB0_PHY_BTN		BIT(4)
+#define	FSP_PB0_MFMC		BIT(5)
+
+/* hardware revisions */
+#define	FSP_VER_STL3888_A4	(0xC1)
+#define	FSP_VER_STL3888_B0	(0xD0)
+#define	FSP_VER_STL3888_B1	(0xD1)
+#define	FSP_VER_STL3888_B2	(0xD2)
+#define	FSP_VER_STL3888_C0	(0xE0)
+#define	FSP_VER_STL3888_C1	(0xE1)
+#define	FSP_VER_STL3888_D0	(0xE2)
+#define	FSP_VER_STL3888_D1	(0xE3)
+#define	FSP_VER_STL3888_E0	(0xE4)
+
+#ifdef __KERNEL__
+
+struct fsp_data {
+	unsigned char	ver;		/* hardware version */
+	unsigned char	rev;		/* hardware revison */
+	unsigned int	buttons;	/* Number of buttons */
+	unsigned int	flags;
+#define	FSPDRV_FLAG_EN_OPC	(0x001)	/* enable on-pad clicking */
+
+	bool		vscroll;	/* Vertical scroll zone enabled */
+	bool		hscroll;	/* Horizontal scroll zone enabled */
+
+	unsigned char	last_reg;	/* Last register we requested read from */
+	unsigned char	last_val;
+	unsigned int	last_mt_fgr;	/* Last seen finger(multitouch) */
+};
+
+extern int fsp_detect(struct psmouse *psmouse, bool set_properties);
+extern int fsp_init(struct psmouse *psmouse);
+
+#endif	/* __KERNEL__ */
+
+#endif	/* !__SENTELIC_H */