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When doing device passthrough where interrupts are being forwarded from host to guest, we wish to use a pinned section of guest memory as the vector (the same memory used by the guest as the vector). To accomplish this, add a new parameter for airq_iv_create which allows passing an existing vector to be used instead of allocating a new one. The caller is responsible for ensuring the vector is pinned in memory as well as for unpinning the memory when the vector is no longer needed. A subsequent patch will use this new parameter for zPCI interpretation. Reviewed-by: Thomas Huth <thuth@redhat.com> Reviewed-by: Pierre Morel <pmorel@linux.ibm.com> Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Acked-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com> Link: https://lore.kernel.org/r/20220606203325.110625-7-mjrosato@linux.ibm.com Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
112 lines
3.3 KiB
C
112 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright IBM Corp. 2002, 2007
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* Author(s): Ingo Adlung <adlung@de.ibm.com>
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* Cornelia Huck <cornelia.huck@de.ibm.com>
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* Arnd Bergmann <arndb@de.ibm.com>
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* Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
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*/
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#ifndef _ASM_S390_AIRQ_H
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#define _ASM_S390_AIRQ_H
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#include <linux/bit_spinlock.h>
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#include <linux/dma-mapping.h>
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#include <asm/tpi.h>
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struct airq_struct {
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struct hlist_node list; /* Handler queueing. */
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void (*handler)(struct airq_struct *airq, struct tpi_info *tpi_info);
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u8 *lsi_ptr; /* Local-Summary-Indicator pointer */
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u8 lsi_mask; /* Local-Summary-Indicator mask */
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u8 isc; /* Interrupt-subclass */
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u8 flags;
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};
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#define AIRQ_PTR_ALLOCATED 0x01
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int register_adapter_interrupt(struct airq_struct *airq);
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void unregister_adapter_interrupt(struct airq_struct *airq);
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/* Adapter interrupt bit vector */
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struct airq_iv {
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unsigned long *vector; /* Adapter interrupt bit vector */
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dma_addr_t vector_dma; /* Adapter interrupt bit vector dma */
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unsigned long *avail; /* Allocation bit mask for the bit vector */
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unsigned long *bitlock; /* Lock bit mask for the bit vector */
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unsigned long *ptr; /* Pointer associated with each bit */
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unsigned int *data; /* 32 bit value associated with each bit */
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unsigned long bits; /* Number of bits in the vector */
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unsigned long end; /* Number of highest allocated bit + 1 */
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unsigned long flags; /* Allocation flags */
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spinlock_t lock; /* Lock to protect alloc & free */
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};
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#define AIRQ_IV_ALLOC 1 /* Use an allocation bit mask */
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#define AIRQ_IV_BITLOCK 2 /* Allocate the lock bit mask */
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#define AIRQ_IV_PTR 4 /* Allocate the ptr array */
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#define AIRQ_IV_DATA 8 /* Allocate the data array */
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#define AIRQ_IV_CACHELINE 16 /* Cacheline alignment for the vector */
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#define AIRQ_IV_GUESTVEC 32 /* Vector is a pinned guest page */
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struct airq_iv *airq_iv_create(unsigned long bits, unsigned long flags,
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unsigned long *vec);
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void airq_iv_release(struct airq_iv *iv);
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unsigned long airq_iv_alloc(struct airq_iv *iv, unsigned long num);
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void airq_iv_free(struct airq_iv *iv, unsigned long bit, unsigned long num);
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unsigned long airq_iv_scan(struct airq_iv *iv, unsigned long start,
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unsigned long end);
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static inline unsigned long airq_iv_alloc_bit(struct airq_iv *iv)
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{
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return airq_iv_alloc(iv, 1);
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}
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static inline void airq_iv_free_bit(struct airq_iv *iv, unsigned long bit)
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{
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airq_iv_free(iv, bit, 1);
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}
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static inline unsigned long airq_iv_end(struct airq_iv *iv)
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{
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return iv->end;
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}
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static inline void airq_iv_lock(struct airq_iv *iv, unsigned long bit)
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{
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const unsigned long be_to_le = BITS_PER_LONG - 1;
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bit_spin_lock(bit ^ be_to_le, iv->bitlock);
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}
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static inline void airq_iv_unlock(struct airq_iv *iv, unsigned long bit)
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{
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const unsigned long be_to_le = BITS_PER_LONG - 1;
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bit_spin_unlock(bit ^ be_to_le, iv->bitlock);
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}
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static inline void airq_iv_set_data(struct airq_iv *iv, unsigned long bit,
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unsigned int data)
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{
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iv->data[bit] = data;
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}
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static inline unsigned int airq_iv_get_data(struct airq_iv *iv,
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unsigned long bit)
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{
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return iv->data[bit];
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}
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static inline void airq_iv_set_ptr(struct airq_iv *iv, unsigned long bit,
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unsigned long ptr)
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{
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iv->ptr[bit] = ptr;
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}
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static inline unsigned long airq_iv_get_ptr(struct airq_iv *iv,
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unsigned long bit)
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{
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return iv->ptr[bit];
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}
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#endif /* _ASM_S390_AIRQ_H */
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