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, 56 insertions, 0 deletions

diff --git a/include/net/rsi_91x.h b/include/net/rsi_91x.h
new file mode 100644
index 000000000..b2283762e
--- /dev/null
+++ b/include/net/rsi_91x.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2017 Redpine Signals Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef __RSI_HEADER_H__
+#define __RSI_HEADER_H__
+
+#include <linux/skbuff.h>
+
+/* HAL queue information */
+#define RSI_COEX_Q			0x0
+#define RSI_BT_Q			0x2
+#define RSI_WLAN_Q                      0x3
+#define RSI_WIFI_MGMT_Q                 0x4
+#define RSI_WIFI_DATA_Q                 0x5
+#define RSI_BT_MGMT_Q			0x6
+#define RSI_BT_DATA_Q			0x7
+
+enum rsi_coex_queues {
+	RSI_COEX_Q_INVALID = -1,
+	RSI_COEX_Q_COMMON = 0,
+	RSI_COEX_Q_BT,
+	RSI_COEX_Q_WLAN
+};
+
+enum rsi_host_intf {
+	RSI_HOST_INTF_SDIO = 0,
+	RSI_HOST_INTF_USB
+};
+
+struct rsi_proto_ops {
+	int (*coex_send_pkt)(void *priv, struct sk_buff *skb, u8 hal_queue);
+	enum rsi_host_intf (*get_host_intf)(void *priv);
+	void (*set_bt_context)(void *priv, void *context);
+};
+
+struct rsi_mod_ops {
+	int (*attach)(void *priv, struct rsi_proto_ops *ops);
+	void (*detach)(void *priv);
+	int (*recv_pkt)(void *priv, const u8 *msg);
+};
+
+extern const struct rsi_mod_ops rsi_bt_ops;
+#endif