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When injecting IPIs to a set of harts, the IMSIC IPI support will do a separate MMIO write to the SETIPNUM_LE register of each target hart. This means on a platform where IMSIC is trap-n-emulated, there will be N MMIO traps when injecting IPI to N target harts hence IMSIC IPIs will be slow on such platforms compared to the SBI IPI extension. Unfortunately, there is no DT, ACPI, or any other way of discovering whether the underlying IMSIC is trap-n-emulated. Using MMIO write to the SETIPNUM_LE register for injecting IPI is purely a software choice in the IMSIC driver hence add a kernel parameter to allow users to disable IMSIC IPIs on platforms with trap-n-emulated IMSIC. Signed-off-by: Anup Patel <apatel@ventanamicro.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/all/20250716123745.557585-1-apatel@ventanamicro.com
111 lines
2.9 KiB
C
111 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2021 Western Digital Corporation or its affiliates.
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* Copyright (C) 2022 Ventana Micro Systems Inc.
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*/
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#ifndef _IRQ_RISCV_IMSIC_STATE_H
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#define _IRQ_RISCV_IMSIC_STATE_H
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#include <linux/irqchip/riscv-imsic.h>
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#include <linux/irqdomain.h>
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#include <linux/fwnode.h>
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#include <linux/timer.h>
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#define IMSIC_IPI_ID 1
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#define IMSIC_NR_IPI 8
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struct imsic_vector {
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/* Fixed details of the vector */
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unsigned int cpu;
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unsigned int local_id;
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/* Details saved by driver in the vector */
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unsigned int irq;
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/* Details accessed using local lock held */
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bool enable;
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struct imsic_vector *move_next;
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struct imsic_vector *move_prev;
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};
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struct imsic_local_priv {
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/* Local lock to protect vector enable/move variables and dirty bitmap */
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raw_spinlock_t lock;
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/* Local dirty bitmap for synchronization */
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unsigned long *dirty_bitmap;
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#ifdef CONFIG_SMP
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/* Local timer for synchronization */
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struct timer_list timer;
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#endif
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/* Local vector table */
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struct imsic_vector *vectors;
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};
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struct imsic_priv {
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/* Device details */
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struct fwnode_handle *fwnode;
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/* Global configuration common for all HARTs */
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struct imsic_global_config global;
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/* Per-CPU state */
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struct imsic_local_priv __percpu *lpriv;
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/* State of IRQ matrix allocator */
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raw_spinlock_t matrix_lock;
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struct irq_matrix *matrix;
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/* IRQ domains (created by platform driver) */
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struct irq_domain *base_domain;
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};
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extern bool imsic_noipi;
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extern struct imsic_priv *imsic;
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void __imsic_eix_update(unsigned long base_id, unsigned long num_id, bool pend, bool val);
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static inline void __imsic_id_set_enable(unsigned long id)
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{
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__imsic_eix_update(id, 1, false, true);
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}
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static inline void __imsic_id_clear_enable(unsigned long id)
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{
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__imsic_eix_update(id, 1, false, false);
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}
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void imsic_local_sync_all(bool force_all);
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void imsic_local_delivery(bool enable);
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void imsic_vector_mask(struct imsic_vector *vec);
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void imsic_vector_unmask(struct imsic_vector *vec);
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static inline bool imsic_vector_isenabled(struct imsic_vector *vec)
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{
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return READ_ONCE(vec->enable);
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}
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static inline struct imsic_vector *imsic_vector_get_move(struct imsic_vector *vec)
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{
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return READ_ONCE(vec->move_prev);
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}
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void imsic_vector_force_move_cleanup(struct imsic_vector *vec);
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void imsic_vector_move(struct imsic_vector *old_vec, struct imsic_vector *new_vec);
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struct imsic_vector *imsic_vector_from_local_id(unsigned int cpu, unsigned int local_id);
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struct imsic_vector *imsic_vector_alloc(unsigned int irq, const struct cpumask *mask);
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void imsic_vector_free(struct imsic_vector *vector);
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void imsic_vector_debug_show(struct seq_file *m, struct imsic_vector *vec, int ind);
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void imsic_vector_debug_show_summary(struct seq_file *m, int ind);
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void imsic_state_online(void);
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void imsic_state_offline(void);
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int imsic_setup_state(struct fwnode_handle *fwnode, void *opaque);
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int imsic_irqdomain_init(void);
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#endif
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