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4 .\" SPDX-License-Identifier: BSD-2-Clause
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29 Universal Flash Storage (UFS) is a low-power, high-performance storage
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43 Operation in the legacy single-doorbell queue mode
54 UFS 4.1 feature coverage, additional power-management modes, and
55 ACPI/FDT-based attach support.
64 driver currently operates with a single doorbell (one I/O-queue), so any
66 When Multi-Circular Queue (MCQ) support is added and multiple queues
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76 number of MSI-X vectors consumed by the device, set the following tunable
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94 To force the driver to use legacy INTx interrupts, set the following tunable
97 (Note: until MCQ support is available the driver always uses legacy INTx, so
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103 The following controller-level
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112 (R) Number of times the interrupt handler has been called.
120 (R) Number of I/O-queue pairs.
122 (R) Indicates single doorbell mode or multi circular queue mode.
128 (R) Number of failed UTP task-management requests.
130 (R) Number of retried UTP task-management requests.
132 (R) Number of interrupt handler calls caused by UTP task-management requests.
134 (R) Number of UTP task-management requests issued.
136 (R) Current location of the UTP task-management completion queue head.
138 (R) Current location of the UTP task-management submission queue tail.
140 (R) Current location of the UTP task-management submission queue head.
142 (R) Number of trackers in the UTP task-management queue.
144 (R) Number of entries in the UTP task-management queue.
150 (R) Number of interrupt-handler calls caused by UTP transfer requests.
174 .An -nosplit