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2023-12-11 1f93a7dfd1f8d5ff7a5c53246c7534fe2332d6f4

 kernel/arch/powerpc/platforms/powernv/vas.h
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@@ -1,10 +1,6 @@
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
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 /*
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  * Copyright 2016-17 IBM Corp.
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * as published by the Free Software Foundation; either version
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- * 2 of the License, or (at your option) any later version.
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  */
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 #ifndef _VAS_H
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@@ -105,11 +101,9 @@
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 /*
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  * Initial per-process credits.
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  * Max send window credits:    4K-1 (12-bits in VAS_TX_WCRED)
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- * Max receive window credits: 64K-1 (16 bits in VAS_LRX_WCRED)
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  *
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  * TODO: Needs tuning for per-process credits
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  */
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-#define VAS_RX_WCREDS_MAX		((64 << 10) - 1)
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 #define VAS_TX_WCREDS_MAX		((4 << 10) - 1)
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 #define VAS_WCREDS_DEFAULT		(1 << 10)
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@@ -300,6 +294,22 @@
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 };
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 /*
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+ * NX can generate an interrupt for multiple faults and expects kernel
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+ * to process all of them. So read all valid CRB entries until find the
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+ * invalid one. So use pswid which is pasted by NX and ccw[0] (reserved
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+ * bit in BE) to check valid CRB. CCW[0] will not be touched by user
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+ * space. Application gets CRB formt error if it updates this bit.
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+ *
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+ * Invalidate FIFO during allocation and process all entries from last
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+ * successful read until finds invalid pswid and ccw[0] values.
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+ * After reading each CRB entry from fault FIFO, the kernel invalidate
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+ * it by updating pswid with FIFO_INVALID_ENTRY and CCW[0] with
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+ * CCW0_INVALID.
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+ */
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+#define FIFO_INVALID_ENTRY	0xffffffff
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+#define CCW0_INVALID		1
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+
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+/*
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  * One per instance of VAS. Each instance will have a separate set of
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  * receive windows, one per coprocessor type.
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  *
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@@ -316,6 +326,15 @@
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 	u64 uwc_bar_start;
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 	u64 paste_base_addr;
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 	u64 paste_win_id_shift;
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+
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+	u64 irq_port;
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+	int virq;
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+	int fault_crbs;
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+	int fault_fifo_size;
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+	int fifo_in_progress;	/* To wake up thread or return IRQ_HANDLED */
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+	spinlock_t fault_lock;	/* Protects fifo_in_progress update */
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+	void *fault_fifo;
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+	struct vas_window *fault_win; /* Fault window */
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 	struct mutex mutex;
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 	struct vas_window *rxwin[VAS_COP_TYPE_MAX];
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@@ -337,7 +356,9 @@
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 	bool user_win;		/* True if user space window */
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 	void *hvwc_map;		/* HV window context */
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 	void *uwc_map;		/* OS/User window context */
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-	pid_t pid;		/* Linux process id of owner */
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+	struct pid *pid;	/* Linux process id of owner */
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+	struct pid *tgid;	/* Thread group ID of owner */
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+	struct mm_struct *mm;	/* Linux process mm_struct */
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 	int wcreds_max;		/* Window credits */
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 	char *dbgname;
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@@ -362,7 +383,7 @@
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  * is a container for the register fields in the window context.
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  */
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 struct vas_winctx {
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-	void *rx_fifo;
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+	u64 rx_fifo;
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 	int rx_fifo_size;
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 	int wcreds_max;
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 	int rsvd_txbuf_count;
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@@ -410,6 +431,19 @@
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 extern void vas_instance_init_dbgdir(struct vas_instance *vinst);
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 extern void vas_window_init_dbgdir(struct vas_window *win);
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 extern void vas_window_free_dbgdir(struct vas_window *win);
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+extern int vas_setup_fault_window(struct vas_instance *vinst);
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+extern irqreturn_t vas_fault_thread_fn(int irq, void *data);
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+extern irqreturn_t vas_fault_handler(int irq, void *dev_id);
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+extern void vas_return_credit(struct vas_window *window, bool tx);
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+extern struct vas_window *vas_pswid_to_window(struct vas_instance *vinst,
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+						uint32_t pswid);
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+extern void vas_win_paste_addr(struct vas_window *window, u64 *addr,
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+					int *len);
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+
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+static inline int vas_window_pid(struct vas_window *window)
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+{
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+	return pid_vnr(window->pid);
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+}
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 static inline void vas_log_write(struct vas_window *win, char *name,
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 			void *regptr, u64 val)
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@@ -460,12 +494,7 @@
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  */
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 static inline u32 encode_pswid(int vasid, int winid)
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 {
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-	u32 pswid = 0;
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-
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-	pswid |= vasid << (31 - 7);
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-	pswid |= winid;
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-
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-	return pswid;
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+	return ((u32)winid | (vasid << (31 - 7)));
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 }
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 static inline void decode_pswid(u32 pswid, int *vasid, int *winid)