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scsi: scsi_proto: Add structures and constants related to I/O groups and streams

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Prepare for adding code that will query the I/O advice hints group
descriptors and for adding code that will retrieve the stream status.

Cc: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20240130214911.1863909-11-bvanassche@acm.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche 2024-01-30 13:48:36 -08:00 committed by Martin K. Petersen
parent 96b171d6db
commit 4977c0f452
4 changed files with 141 additions and 0 deletions
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5
drivers/scsi/Kconfig
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@ -232,6 +232,11 @@ config SCSI_SCAN_ASYNC
Note that this setting also affects whether resuming from
system suspend will be performed asynchronously.
config SCSI_PROTO_TEST
tristate "scsi_proto.h unit tests" if !KUNIT_ALL_TESTS
depends on SCSI && KUNIT
default KUNIT_ALL_TESTS
menu "SCSI Transports"
depends on SCSI

2
drivers/scsi/Makefile
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@ -24,6 +24,8 @@ obj-$(CONFIG_SCSI_COMMON) += scsi_common.o
obj-$(CONFIG_RAID_ATTRS) += raid_class.o
obj-$(CONFIG_SCSI_PROTO_TEST) += scsi_proto_test.o
# --- NOTE ORDERING HERE ---
# For kernel non-modular link, transport attributes need to
# be initialised before drivers

56
drivers/scsi/scsi_proto_test.c Normal file
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@ -0,0 +1,56 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2023 Google LLC
*/
#include <kunit/test.h>
#include <asm-generic/unaligned.h>
#include <scsi/scsi_proto.h>
static void test_scsi_proto(struct kunit *test)
{
static const union {
struct scsi_io_group_descriptor desc;
u8 arr[sizeof(struct scsi_io_group_descriptor)];
} d = { .arr = { 0x45, 0, 0, 0, 0xb0, 0xe4, 0xe3 } };
KUNIT_EXPECT_EQ(test, d.desc.io_advice_hints_mode + 0, 1);
KUNIT_EXPECT_EQ(test, d.desc.st_enble + 0, 1);
KUNIT_EXPECT_EQ(test, d.desc.cs_enble + 0, 0);
KUNIT_EXPECT_EQ(test, d.desc.ic_enable + 0, 1);
KUNIT_EXPECT_EQ(test, d.desc.acdlu + 0, 1);
KUNIT_EXPECT_EQ(test, d.desc.rlbsr + 0, 3);
KUNIT_EXPECT_EQ(test, d.desc.lbm_descriptor_type + 0, 0);
KUNIT_EXPECT_EQ(test, d.desc.params[0] + 0, 0xe4);
KUNIT_EXPECT_EQ(test, d.desc.params[1] + 0, 0xe3);
static const union {
struct scsi_stream_status s;
u8 arr[sizeof(struct scsi_stream_status)];
} ss = { .arr = { 0x80, 0, 0x12, 0x34, 0x3f } };
KUNIT_EXPECT_EQ(test, ss.s.perm + 0, 1);
KUNIT_EXPECT_EQ(test, get_unaligned_be16(&ss.s.stream_identifier),
0x1234);
KUNIT_EXPECT_EQ(test, ss.s.rel_lifetime + 0, 0x3f);
static const union {
struct scsi_stream_status_header h;
u8 arr[sizeof(struct scsi_stream_status_header)];
} sh = { .arr = { 1, 2, 3, 4, 0, 0, 5, 6 } };
KUNIT_EXPECT_EQ(test, get_unaligned_be32(&sh.h.len), 0x1020304);
KUNIT_EXPECT_EQ(test, get_unaligned_be16(&sh.h.number_of_open_streams),
0x506);
}
static struct kunit_case scsi_proto_test_cases[] = {
KUNIT_CASE(test_scsi_proto),
{}
};
static struct kunit_suite scsi_proto_test_suite = {
.name = "scsi_proto",
.test_cases = scsi_proto_test_cases,
};
kunit_test_suite(scsi_proto_test_suite);
MODULE_DESCRIPTION("<scsi/scsi_proto.h> unit tests");
MODULE_AUTHOR("Bart Van Assche");
MODULE_LICENSE("GPL");

78
include/scsi/scsi_proto.h
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@ -10,6 +10,7 @@
#ifndef _SCSI_PROTO_H_
#define _SCSI_PROTO_H_
#include <linux/build_bug.h>
#include <linux/types.h>
/*
@ -126,6 +127,7 @@
#define SAI_READ_CAPACITY_16 0x10
#define SAI_GET_LBA_STATUS 0x12
#define SAI_REPORT_REFERRALS 0x13
#define SAI_GET_STREAM_STATUS 0x16
/* values for maintenance in */
#define MI_REPORT_IDENTIFYING_INFORMATION 0x05
#define MI_REPORT_TARGET_PGS 0x0a
@ -275,6 +277,82 @@ struct scsi_lun {
__u8 scsi_lun[8];
};
/* SBC-5 IO advice hints group descriptor */
struct scsi_io_group_descriptor {
#if defined(__BIG_ENDIAN)
u8 io_advice_hints_mode: 2;
u8 reserved1: 3;
u8 st_enble: 1;
u8 cs_enble: 1;
u8 ic_enable: 1;
#elif defined(__LITTLE_ENDIAN)
u8 ic_enable: 1;
u8 cs_enble: 1;
u8 st_enble: 1;
u8 reserved1: 3;
u8 io_advice_hints_mode: 2;
#else
#error
#endif
u8 reserved2[3];
/* Logical block markup descriptor */
#if defined(__BIG_ENDIAN)
u8 acdlu: 1;
u8 reserved3: 1;
u8 rlbsr: 2;
u8 lbm_descriptor_type: 4;
#elif defined(__LITTLE_ENDIAN)
u8 lbm_descriptor_type: 4;
u8 rlbsr: 2;
u8 reserved3: 1;
u8 acdlu: 1;
#else
#error
#endif
u8 params[2];
u8 reserved4;
u8 reserved5[8];
};
static_assert(sizeof(struct scsi_io_group_descriptor) == 16);
/* SCSI stream status descriptor */
struct scsi_stream_status {
#if defined(__BIG_ENDIAN)
u8 perm: 1;
u8 reserved1: 7;
#elif defined(__LITTLE_ENDIAN)
u8 reserved1: 7;
u8 perm: 1;
#else
#error
#endif
u8 reserved2;
__be16 stream_identifier;
#if defined(__BIG_ENDIAN)
u8 reserved3: 2;
u8 rel_lifetime: 6;
#elif defined(__LITTLE_ENDIAN)
u8 rel_lifetime: 6;
u8 reserved3: 2;
#else
#error
#endif
u8 reserved4[3];
};
static_assert(sizeof(struct scsi_stream_status) == 8);
/* GET STREAM STATUS parameter data */
struct scsi_stream_status_header {
__be32 len; /* length in bytes of stream_status[] array. */
u16 reserved;
__be16 number_of_open_streams;
DECLARE_FLEX_ARRAY(struct scsi_stream_status, stream_status);
};
static_assert(sizeof(struct scsi_stream_status_header) == 8);
/* SPC asymmetric access states */
#define SCSI_ACCESS_STATE_OPTIMAL 0x00
#define SCSI_ACCESS_STATE_ACTIVE 0x01