diff options
Diffstat (limited to 'drivers/staging/gasket/gasket.h')
| -rw-r--r-- | drivers/staging/gasket/gasket.h | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/drivers/staging/gasket/gasket.h b/drivers/staging/gasket/gasket.h new file mode 100644 index 000000000000..a0f065c517a5 --- /dev/null +++ b/drivers/staging/gasket/gasket.h @@ -0,0 +1,122 @@ +/* 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__ */ |