| 1 | /*
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| 2 | * Copyright (c) 2019 Jakub Jermar
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | #ifndef _VIRTIO_BLK_H_
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| 30 | #define _VIRTIO_BLK_H_
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| 31 |
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| 32 | #include <virtio-pci.h>
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| 33 | #include <bd_srv.h>
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| 34 | #include <abi/cap.h>
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| 35 |
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| 36 | #include <fibril_synch.h>
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| 37 |
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| 38 | #define VIRTIO_BLK_BLOCK_SIZE 512
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| 39 |
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| 40 | /* Operation types. */
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| 41 | #define VIRTIO_BLK_T_IN 0
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| 42 | #define VIRTIO_BLK_T_OUT 1
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| 43 |
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| 44 | /* Status codes returned by the device. */
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| 45 | #define VIRTIO_BLK_S_OK 0
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| 46 | #define VIRTIO_BLK_S_IOERR 1
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| 47 | #define VIRTIO_BLK_S_UNSUPP 2
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| 48 |
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| 49 | #define RQ_BUFFERS 32
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| 50 |
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| 51 | /** Device is read-only. */
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| 52 | #define VIRTIO_BLK_F_RO (1U << 5)
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| 53 |
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| 54 | typedef struct {
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| 55 | uint32_t type;
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| 56 | uint32_t reserved;
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| 57 | uint64_t sector;
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| 58 | } virtio_blk_req_header_t;
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| 59 |
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| 60 | typedef struct {
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| 61 | uint8_t status;
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| 62 | } virtio_blk_req_footer_t;
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| 63 |
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| 64 | typedef struct {
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| 65 | uint64_t capacity;
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| 66 | } virtio_blk_cfg_t;
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| 67 |
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| 68 | typedef struct {
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| 69 | virtio_dev_t virtio_dev;
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| 70 |
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| 71 | void *rq_header[RQ_BUFFERS];
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| 72 | uintptr_t rq_header_p[RQ_BUFFERS];
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| 73 |
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| 74 | void *rq_buf[RQ_BUFFERS];
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| 75 | uintptr_t rq_buf_p[RQ_BUFFERS];
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| 76 |
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| 77 | void *rq_footer[RQ_BUFFERS];
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| 78 | uintptr_t rq_footer_p[RQ_BUFFERS];
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| 79 |
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| 80 | uint16_t rq_free_head;
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| 81 |
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| 82 | int irq;
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| 83 | cap_irq_handle_t irq_handle;
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| 84 |
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| 85 | bd_srvs_t bds;
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| 86 |
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| 87 | fibril_mutex_t free_lock;
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| 88 | fibril_condvar_t free_cv;
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| 89 |
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| 90 | fibril_mutex_t completion_lock[RQ_BUFFERS];
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| 91 | fibril_condvar_t completion_cv[RQ_BUFFERS];
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| 92 | } virtio_blk_t;
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| 93 |
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| 94 | #endif
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