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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 | /* SPDX-License-Identifier: GPL-2.0 */
/*
* Common Gasket device kernel and user space declarations.
*
* Copyright (C) 2018 Google, Inc.
*/
#ifndef __GASKET_H__
#define __GASKET_H__
#include <linux/ioctl.h>
#include <linux/types.h>
/* ioctl structure declarations */
/* Ioctl structures are padded to a multiple of 64 bits */
/* and padded to put 64 bit values on 64 bit boundaries. */
/* Unsigned 64 bit integers are used to hold pointers. */
/* This helps compatibility between 32 and 64 bits. */
/*
* Common structure for ioctls associating an eventfd with a device interrupt,
* when using the Gasket interrupt module.
*/
struct gasket_interrupt_eventfd {
u64 interrupt;
u64 event_fd;
};
/*
* Common structure for ioctls mapping and unmapping buffers when using the
* Gasket page_table module.
*/
struct gasket_page_table_ioctl {
u64 page_table_index;
u64 size;
u64 host_address;
u64 device_address;
};
/*
* Common structure for ioctls mapping and unmapping buffers when using the
* Gasket page_table module.
* dma_address: phys addr start of coherent memory, allocated by kernel
*/
struct gasket_coherent_alloc_config_ioctl {
u64 page_table_index;
u64 enable;
u64 size;
u64 dma_address;
};
/* Base number for all Gasket-common IOCTLs */
#define GASKET_IOCTL_BASE 0xDC
/* Reset the device. */
#define GASKET_IOCTL_RESET _IO(GASKET_IOCTL_BASE, 0)
/* Associate the specified [event]fd with the specified interrupt. */
#define GASKET_IOCTL_SET_EVENTFD \
_IOW(GASKET_IOCTL_BASE, 1, struct gasket_interrupt_eventfd)
/*
* Clears any eventfd associated with the specified interrupt. The (ulong)
* argument is the interrupt number to clear.
*/
#define GASKET_IOCTL_CLEAR_EVENTFD _IOW(GASKET_IOCTL_BASE, 2, unsigned long)
/*
* [Loopbacks only] Requests that the loopback device send the specified
* interrupt to the host. The (ulong) argument is the number of the interrupt to
* send.
*/
#define GASKET_IOCTL_LOOPBACK_INTERRUPT \
_IOW(GASKET_IOCTL_BASE, 3, unsigned long)
/* Queries the kernel for the number of page tables supported by the device. */
#define GASKET_IOCTL_NUMBER_PAGE_TABLES _IOR(GASKET_IOCTL_BASE, 4, u64)
/*
* Queries the kernel for the maximum size of the page table. Only the size and
* page_table_index fields are used from the struct gasket_page_table_ioctl.
*/
#define GASKET_IOCTL_PAGE_TABLE_SIZE \
_IOWR(GASKET_IOCTL_BASE, 5, struct gasket_page_table_ioctl)
/*
* Queries the kernel for the current simple page table size. Only the size and
* page_table_index fields are used from the struct gasket_page_table_ioctl.
*/
#define GASKET_IOCTL_SIMPLE_PAGE_TABLE_SIZE \
_IOWR(GASKET_IOCTL_BASE, 6, struct gasket_page_table_ioctl)
/*
* Tells the kernel to change the split between the number of simple and
* extended entries in the given page table. Only the size and page_table_index
* fields are used from the struct gasket_page_table_ioctl.
*/
#define GASKET_IOCTL_PARTITION_PAGE_TABLE \
_IOW(GASKET_IOCTL_BASE, 7, struct gasket_page_table_ioctl)
/*
* Tells the kernel to map size bytes at host_address to device_address in
* page_table_index page table.
*/
#define GASKET_IOCTL_MAP_BUFFER \
_IOW(GASKET_IOCTL_BASE, 8, struct gasket_page_table_ioctl)
/*
* Tells the kernel to unmap size bytes at host_address from device_address in
* page_table_index page table.
*/
#define GASKET_IOCTL_UNMAP_BUFFER \
_IOW(GASKET_IOCTL_BASE, 9, struct gasket_page_table_ioctl)
/* Clear the interrupt counts stored for this device. */
#define GASKET_IOCTL_CLEAR_INTERRUPT_COUNTS _IO(GASKET_IOCTL_BASE, 10)
/* Enable/Disable and configure the coherent allocator. */
#define GASKET_IOCTL_CONFIG_COHERENT_ALLOCATOR \
_IOWR(GASKET_IOCTL_BASE, 11, struct gasket_coherent_alloc_config_ioctl)
#endif /* __GASKET_H__ */
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