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Signed-off-by: Dmitry Fleytman <dmitry@daynix.com> Signed-off-by: Yan Vugenfirer <yan@daynix.com> [ Rename files to vmw_pvscsi, fix setting of hostStatus in pvscsi_request_cancelled - Paolo ] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>stable-1.5
Dmitry Fleytman
13 years ago
committed by
Paolo Bonzini
Paolo Bonzini
7 changed files with 1780 additions and 0 deletions
@ -0,0 +1,92 @@ |
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General Description |
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=================== |
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|
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This document describes VMWare PVSCSI device interface specification. |
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Created by Dmitry Fleytman (dmitry@daynix.com), Daynix Computing LTD. |
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Based on source code of PVSCSI Linux driver from kernel 3.0.4 |
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|
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PVSCSI Device Interface Overview |
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================================ |
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|
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The interface is based on memory area shared between hypervisor and VM. |
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Memory area is obtained by driver as device IO memory resource of |
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PVSCSI_MEM_SPACE_SIZE length. |
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The shared memory consists of registers area and rings area. |
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The registers area is used to raise hypervisor interrupts and issue device |
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commands. The rings area is used to transfer data descriptors and SCSI |
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commands from VM to hypervisor and to transfer messages produced by |
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hypervisor to VM. Data itself is transferred via virtual scatter-gather DMA. |
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|
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PVSCSI Device Registers |
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======================= |
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|
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The length of the registers area is 1 page (PVSCSI_MEM_SPACE_COMMAND_NUM_PAGES). |
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The structure of the registers area is described by the PVSCSIRegOffset enum. |
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There are registers to issue device command (with optional short data), |
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issue device interrupt, control interrupts masking. |
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|
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PVSCSI Device Rings |
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=================== |
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|
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There are three rings in shared memory: |
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|
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1. Request ring (struct PVSCSIRingReqDesc *req_ring) |
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- ring for OS to device requests |
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2. Completion ring (struct PVSCSIRingCmpDesc *cmp_ring) |
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- ring for device request completions |
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3. Message ring (struct PVSCSIRingMsgDesc *msg_ring) |
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- ring for messages from device. |
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This ring is optional and the guest might not configure it. |
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There is a control area (struct PVSCSIRingsState *rings_state) used to control |
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rings operation. |
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|
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PVSCSI Device to Host Interrupts |
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================================ |
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There are following interrupt types supported by PVSCSI device: |
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1. Completion interrupts (completion ring notifications): |
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PVSCSI_INTR_CMPL_0 |
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PVSCSI_INTR_CMPL_1 |
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2. Message interrupts (message ring notifications): |
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PVSCSI_INTR_MSG_0 |
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PVSCSI_INTR_MSG_1 |
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|
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Interrupts are controlled via PVSCSI_REG_OFFSET_INTR_MASK register |
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Bit set means interrupt enabled, bit cleared - disabled |
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|
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Interrupt modes supported are legacy, MSI and MSI-X |
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In case of legacy interrupts, register PVSCSI_REG_OFFSET_INTR_STATUS |
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is used to check which interrupt has arrived. Interrupts are |
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acknowledged when the corresponding bit is written to the interrupt |
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status register. |
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|
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PVSCSI Device Operation Sequences |
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================================= |
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|
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1. Startup sequence: |
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a. Issue PVSCSI_CMD_ADAPTER_RESET command; |
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aa. Windows driver reads interrupt status register here; |
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b. Issue PVSCSI_CMD_SETUP_MSG_RING command with no additional data, |
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check status and disable device messages if error returned; |
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(Omitted if device messages disabled by driver configuration) |
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c. Issue PVSCSI_CMD_SETUP_RINGS command, provide rings configuration |
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as struct PVSCSICmdDescSetupRings; |
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d. Issue PVSCSI_CMD_SETUP_MSG_RING command again, provide |
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rings configuration as struct PVSCSICmdDescSetupMsgRing; |
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e. Unmask completion and message (if device messages enabled) interrupts. |
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|
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2. Shutdown sequences |
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a. Mask interrupts; |
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b. Flush request ring using PVSCSI_REG_OFFSET_KICK_NON_RW_IO; |
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c. Issue PVSCSI_CMD_ADAPTER_RESET command. |
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|
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3. Send request |
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a. Fill next free request ring descriptor; |
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b. Issue PVSCSI_REG_OFFSET_KICK_RW_IO for R/W operations; |
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or PVSCSI_REG_OFFSET_KICK_NON_RW_IO for other operations. |
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|
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4. Abort command |
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a. Issue PVSCSI_CMD_ABORT_CMD command; |
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|
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5. Request completion processing |
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a. Upon completion interrupt arrival process completion |
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and message (if enabled) rings. |
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File diff suppressed because it is too large
@ -0,0 +1,434 @@ |
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/*
|
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* VMware PVSCSI header file |
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* |
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* Copyright (C) 2008-2009, VMware, Inc. All Rights Reserved. |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License as published by the |
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* Free Software Foundation; version 2 of the License and no later version. |
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* |
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* This program is distributed in the hope that it will be useful, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
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* NON INFRINGEMENT. See the GNU General Public License for more |
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* details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Maintained by: Arvind Kumar <arvindkumar@vmware.com> |
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* |
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*/ |
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|
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#ifndef VMW_PVSCSI_H |
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#define VMW_PVSCSI_H |
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|
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#define VMW_PAGE_SIZE (4096) |
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#define VMW_PAGE_SHIFT (12) |
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|
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#define MASK(n) ((1 << (n)) - 1) /* make an n-bit mask */ |
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|
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/*
|
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* host adapter status/error codes |
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*/ |
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enum HostBusAdapterStatus { |
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BTSTAT_SUCCESS = 0x00, /* CCB complete normally with no errors */ |
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BTSTAT_LINKED_COMMAND_COMPLETED = 0x0a, |
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BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG = 0x0b, |
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BTSTAT_DATA_UNDERRUN = 0x0c, |
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BTSTAT_SELTIMEO = 0x11, /* SCSI selection timeout */ |
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BTSTAT_DATARUN = 0x12, /* data overrun/underrun */ |
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BTSTAT_BUSFREE = 0x13, /* unexpected bus free */ |
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BTSTAT_INVPHASE = 0x14, /* invalid bus phase or sequence */ |
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/* requested by target */ |
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BTSTAT_LUNMISMATCH = 0x17, /* linked CCB has different LUN */ |
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/* from first CCB */ |
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BTSTAT_SENSFAILED = 0x1b, /* auto request sense failed */ |
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BTSTAT_TAGREJECT = 0x1c, /* SCSI II tagged queueing message */ |
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/* rejected by target */ |
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BTSTAT_BADMSG = 0x1d, /* unsupported message received by */ |
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/* the host adapter */ |
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BTSTAT_HAHARDWARE = 0x20, /* host adapter hardware failed */ |
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BTSTAT_NORESPONSE = 0x21, /* target did not respond to SCSI ATN, */ |
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/* sent a SCSI RST */ |
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BTSTAT_SENTRST = 0x22, /* host adapter asserted a SCSI RST */ |
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BTSTAT_RECVRST = 0x23, /* other SCSI devices asserted a SCSI RST */ |
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BTSTAT_DISCONNECT = 0x24, /* target device reconnected improperly */ |
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/* (w/o tag) */ |
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BTSTAT_BUSRESET = 0x25, /* host adapter issued BUS device reset */ |
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BTSTAT_ABORTQUEUE = 0x26, /* abort queue generated */ |
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BTSTAT_HASOFTWARE = 0x27, /* host adapter software error */ |
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BTSTAT_HATIMEOUT = 0x30, /* host adapter hardware timeout error */ |
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BTSTAT_SCSIPARITY = 0x34, /* SCSI parity error detected */ |
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}; |
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|
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/*
|
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* Register offsets. |
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* |
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* These registers are accessible both via i/o space and mm i/o. |
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*/ |
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|
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enum PVSCSIRegOffset { |
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PVSCSI_REG_OFFSET_COMMAND = 0x0, |
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PVSCSI_REG_OFFSET_COMMAND_DATA = 0x4, |
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PVSCSI_REG_OFFSET_COMMAND_STATUS = 0x8, |
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PVSCSI_REG_OFFSET_LAST_STS_0 = 0x100, |
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PVSCSI_REG_OFFSET_LAST_STS_1 = 0x104, |
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PVSCSI_REG_OFFSET_LAST_STS_2 = 0x108, |
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PVSCSI_REG_OFFSET_LAST_STS_3 = 0x10c, |
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PVSCSI_REG_OFFSET_INTR_STATUS = 0x100c, |
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PVSCSI_REG_OFFSET_INTR_MASK = 0x2010, |
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PVSCSI_REG_OFFSET_KICK_NON_RW_IO = 0x3014, |
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PVSCSI_REG_OFFSET_DEBUG = 0x3018, |
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PVSCSI_REG_OFFSET_KICK_RW_IO = 0x4018, |
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}; |
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|
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/*
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* Virtual h/w commands. |
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*/ |
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|
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enum PVSCSICommands { |
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PVSCSI_CMD_FIRST = 0, /* has to be first */ |
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PVSCSI_CMD_ADAPTER_RESET = 1, |
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PVSCSI_CMD_ISSUE_SCSI = 2, |
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PVSCSI_CMD_SETUP_RINGS = 3, |
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PVSCSI_CMD_RESET_BUS = 4, |
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PVSCSI_CMD_RESET_DEVICE = 5, |
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PVSCSI_CMD_ABORT_CMD = 6, |
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PVSCSI_CMD_CONFIG = 7, |
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PVSCSI_CMD_SETUP_MSG_RING = 8, |
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PVSCSI_CMD_DEVICE_UNPLUG = 9, |
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|
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PVSCSI_CMD_LAST = 10 /* has to be last */ |
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}; |
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|
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#define PVSCSI_COMMAND_PROCESSING_SUCCEEDED (0) |
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#define PVSCSI_COMMAND_PROCESSING_FAILED (-1) |
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#define PVSCSI_COMMAND_NOT_ENOUGH_DATA (-2) |
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|
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/*
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* Command descriptor for PVSCSI_CMD_RESET_DEVICE -- |
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*/ |
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struct PVSCSICmdDescResetDevice { |
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uint32_t target; |
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uint8_t lun[8]; |
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} QEMU_PACKED; |
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|
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typedef struct PVSCSICmdDescResetDevice PVSCSICmdDescResetDevice; |
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|
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/*
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* Command descriptor for PVSCSI_CMD_ABORT_CMD -- |
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* |
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* - currently does not support specifying the LUN. |
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* - pad should be 0. |
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*/ |
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struct PVSCSICmdDescAbortCmd { |
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uint64_t context; |
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uint32_t target; |
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uint32_t pad; |
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} QEMU_PACKED; |
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|
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typedef struct PVSCSICmdDescAbortCmd PVSCSICmdDescAbortCmd; |
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|
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/*
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* Command descriptor for PVSCSI_CMD_SETUP_RINGS -- |
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* |
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* Notes: |
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* - reqRingNumPages and cmpRingNumPages need to be power of two. |
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* - reqRingNumPages and cmpRingNumPages need to be different from 0, |
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* - reqRingNumPages and cmpRingNumPages need to be inferior to |
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* PVSCSI_SETUP_RINGS_MAX_NUM_PAGES. |
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*/ |
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#define PVSCSI_SETUP_RINGS_MAX_NUM_PAGES 32 |
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struct PVSCSICmdDescSetupRings { |
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uint32_t reqRingNumPages; |
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uint32_t cmpRingNumPages; |
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uint64_t ringsStatePPN; |
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uint64_t reqRingPPNs[PVSCSI_SETUP_RINGS_MAX_NUM_PAGES]; |
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uint64_t cmpRingPPNs[PVSCSI_SETUP_RINGS_MAX_NUM_PAGES]; |
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} QEMU_PACKED; |
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|
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typedef struct PVSCSICmdDescSetupRings PVSCSICmdDescSetupRings; |
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|
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/*
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* Command descriptor for PVSCSI_CMD_SETUP_MSG_RING -- |
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* |
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* Notes: |
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* - this command was not supported in the initial revision of the h/w |
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* interface. Before using it, you need to check that it is supported by |
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* writing PVSCSI_CMD_SETUP_MSG_RING to the 'command' register, then |
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* immediately after read the 'command status' register: |
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* * a value of -1 means that the cmd is NOT supported, |
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* * a value != -1 means that the cmd IS supported. |
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* If it's supported the 'command status' register should return: |
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* sizeof(PVSCSICmdDescSetupMsgRing) / sizeof(uint32_t). |
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* - this command should be issued _after_ the usual SETUP_RINGS so that the |
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* RingsState page is already setup. If not, the command is a nop. |
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* - numPages needs to be a power of two, |
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* - numPages needs to be different from 0, |
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* - pad should be zero. |
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*/ |
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#define PVSCSI_SETUP_MSG_RING_MAX_NUM_PAGES 16 |
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struct PVSCSICmdDescSetupMsgRing { |
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uint32_t numPages; |
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uint32_t pad; |
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uint64_t ringPPNs[PVSCSI_SETUP_MSG_RING_MAX_NUM_PAGES]; |
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} QEMU_PACKED; |
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|
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typedef struct PVSCSICmdDescSetupMsgRing PVSCSICmdDescSetupMsgRing; |
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enum PVSCSIMsgType { |
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PVSCSI_MSG_DEV_ADDED = 0, |
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PVSCSI_MSG_DEV_REMOVED = 1, |
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PVSCSI_MSG_LAST = 2, |
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}; |
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|
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/*
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* Msg descriptor. |
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* |
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* sizeof(struct PVSCSIRingMsgDesc) == 128. |
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* |
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* - type is of type enum PVSCSIMsgType. |
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* - the content of args depend on the type of event being delivered. |
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*/ |
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|
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struct PVSCSIRingMsgDesc { |
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uint32_t type; |
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uint32_t args[31]; |
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} QEMU_PACKED; |
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typedef struct PVSCSIRingMsgDesc PVSCSIRingMsgDesc; |
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|
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struct PVSCSIMsgDescDevStatusChanged { |
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uint32_t type; /* PVSCSI_MSG_DEV _ADDED / _REMOVED */ |
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uint32_t bus; |
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uint32_t target; |
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uint8_t lun[8]; |
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uint32_t pad[27]; |
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} QEMU_PACKED; |
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typedef struct PVSCSIMsgDescDevStatusChanged PVSCSIMsgDescDevStatusChanged; |
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|
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/*
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* Rings state. |
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* |
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* - the fields: |
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* . msgProdIdx, |
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* . msgConsIdx, |
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* . msgNumEntriesLog2, |
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* .. are only used once the SETUP_MSG_RING cmd has been issued. |
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* - 'pad' helps to ensure that the msg related fields are on their own |
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* cache-line. |
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*/ |
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|
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struct PVSCSIRingsState { |
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uint32_t reqProdIdx; |
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uint32_t reqConsIdx; |
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uint32_t reqNumEntriesLog2; |
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uint32_t cmpProdIdx; |
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uint32_t cmpConsIdx; |
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uint32_t cmpNumEntriesLog2; |
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|
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uint8_t pad[104]; |
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uint32_t msgProdIdx; |
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uint32_t msgConsIdx; |
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uint32_t msgNumEntriesLog2; |
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} QEMU_PACKED; |
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|
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typedef struct PVSCSIRingsState PVSCSIRingsState; |
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|
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/*
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* Request descriptor. |
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* |
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* sizeof(RingReqDesc) = 128 |
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* |
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* - context: is a unique identifier of a command. It could normally be any |
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* 64bit value, however we currently store it in the serialNumber variable |
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* of struct SCSI_Command, so we have the following restrictions due to the |
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* way this field is handled in the vmkernel storage stack: |
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* * this value can't be 0, |
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* * the upper 32bit need to be 0 since serialNumber is as a uint32_t. |
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* Currently tracked as PR 292060. |
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* - dataLen: contains the total number of bytes that need to be transferred. |
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* - dataAddr: |
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* * if PVSCSI_FLAG_CMD_WITH_SG_LIST is set: dataAddr is the PA of the first |
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* s/g table segment, each s/g segment is entirely contained on a single |
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* page of physical memory, |
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* * if PVSCSI_FLAG_CMD_WITH_SG_LIST is NOT set, then dataAddr is the PA of |
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* the buffer used for the DMA transfer, |
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* - flags: |
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* * PVSCSI_FLAG_CMD_WITH_SG_LIST: see dataAddr above, |
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* * PVSCSI_FLAG_CMD_DIR_NONE: no DMA involved, |
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* * PVSCSI_FLAG_CMD_DIR_TOHOST: transfer from device to main memory, |
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* * PVSCSI_FLAG_CMD_DIR_TODEVICE: transfer from main memory to device, |
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* * PVSCSI_FLAG_CMD_OUT_OF_BAND_CDB: reserved to handle CDBs larger than |
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* 16bytes. To be specified. |
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* - vcpuHint: vcpuId of the processor that will be most likely waiting for the |
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* completion of the i/o. For guest OSes that use lowest priority message |
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* delivery mode (such as windows), we use this "hint" to deliver the |
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* completion action to the proper vcpu. For now, we can use the vcpuId of |
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* the processor that initiated the i/o as a likely candidate for the vcpu |
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* that will be waiting for the completion.. |
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* - bus should be 0: we currently only support bus 0 for now. |
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* - unused should be zero'd. |
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*/ |
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|
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#define PVSCSI_FLAG_CMD_WITH_SG_LIST (1 << 0) |
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#define PVSCSI_FLAG_CMD_OUT_OF_BAND_CDB (1 << 1) |
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#define PVSCSI_FLAG_CMD_DIR_NONE (1 << 2) |
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#define PVSCSI_FLAG_CMD_DIR_TOHOST (1 << 3) |
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#define PVSCSI_FLAG_CMD_DIR_TODEVICE (1 << 4) |
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|
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#define PVSCSI_KNOWN_FLAGS \ |
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(PVSCSI_FLAG_CMD_WITH_SG_LIST | \ |
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PVSCSI_FLAG_CMD_OUT_OF_BAND_CDB | \ |
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PVSCSI_FLAG_CMD_DIR_NONE | \ |
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PVSCSI_FLAG_CMD_DIR_TOHOST | \ |
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PVSCSI_FLAG_CMD_DIR_TODEVICE) |
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|
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struct PVSCSIRingReqDesc { |
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uint64_t context; |
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uint64_t dataAddr; |
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uint64_t dataLen; |
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uint64_t senseAddr; |
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uint32_t senseLen; |
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uint32_t flags; |
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uint8_t cdb[16]; |
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uint8_t cdbLen; |
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uint8_t lun[8]; |
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uint8_t tag; |
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uint8_t bus; |
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uint8_t target; |
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uint8_t vcpuHint; |
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uint8_t unused[59]; |
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} QEMU_PACKED; |
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|
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typedef struct PVSCSIRingReqDesc PVSCSIRingReqDesc; |
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|
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/*
|
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* Scatter-gather list management. |
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* |
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* As described above, when PVSCSI_FLAG_CMD_WITH_SG_LIST is set in the |
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* RingReqDesc.flags, then RingReqDesc.dataAddr is the PA of the first s/g |
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* table segment. |
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* |
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* - each segment of the s/g table contain a succession of struct |
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* PVSCSISGElement. |
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* - each segment is entirely contained on a single physical page of memory. |
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* - a "chain" s/g element has the flag PVSCSI_SGE_FLAG_CHAIN_ELEMENT set in |
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* PVSCSISGElement.flags and in this case: |
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* * addr is the PA of the next s/g segment, |
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* * length is undefined, assumed to be 0. |
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*/ |
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|
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struct PVSCSISGElement { |
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uint64_t addr; |
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uint32_t length; |
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uint32_t flags; |
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} QEMU_PACKED; |
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|
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typedef struct PVSCSISGElement PVSCSISGElement; |
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|
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/*
|
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* Completion descriptor. |
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* |
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* sizeof(RingCmpDesc) = 32 |
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* |
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* - context: identifier of the command. The same thing that was specified |
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* under "context" as part of struct RingReqDesc at initiation time, |
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* - dataLen: number of bytes transferred for the actual i/o operation, |
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* - senseLen: number of bytes written into the sense buffer, |
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* - hostStatus: adapter status, |
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* - scsiStatus: device status, |
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* - pad should be zero. |
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*/ |
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|
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struct PVSCSIRingCmpDesc { |
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uint64_t context; |
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uint64_t dataLen; |
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uint32_t senseLen; |
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uint16_t hostStatus; |
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uint16_t scsiStatus; |
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uint32_t pad[2]; |
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} QEMU_PACKED; |
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|
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typedef struct PVSCSIRingCmpDesc PVSCSIRingCmpDesc; |
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|
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/*
|
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* Interrupt status / IRQ bits. |
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*/ |
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|
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#define PVSCSI_INTR_CMPL_0 (1 << 0) |
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#define PVSCSI_INTR_CMPL_1 (1 << 1) |
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#define PVSCSI_INTR_CMPL_MASK MASK(2) |
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|
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#define PVSCSI_INTR_MSG_0 (1 << 2) |
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#define PVSCSI_INTR_MSG_1 (1 << 3) |
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#define PVSCSI_INTR_MSG_MASK (MASK(2) << 2) |
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|
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#define PVSCSI_INTR_ALL_SUPPORTED MASK(4) |
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|
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/*
|
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* Number of MSI-X vectors supported. |
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*/ |
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#define PVSCSI_MAX_INTRS 24 |
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|
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/*
|
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* Enumeration of supported MSI-X vectors |
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*/ |
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#define PVSCSI_VECTOR_COMPLETION 0 |
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|
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/*
|
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* Misc constants for the rings. |
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*/ |
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|
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#define PVSCSI_MAX_NUM_PAGES_REQ_RING PVSCSI_SETUP_RINGS_MAX_NUM_PAGES |
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#define PVSCSI_MAX_NUM_PAGES_CMP_RING PVSCSI_SETUP_RINGS_MAX_NUM_PAGES |
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#define PVSCSI_MAX_NUM_PAGES_MSG_RING PVSCSI_SETUP_MSG_RING_MAX_NUM_PAGES |
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|
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#define PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE \ |
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(VMW_PAGE_SIZE / sizeof(struct PVSCSIRingReqDesc)) |
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|
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#define PVSCSI_MAX_NUM_CMP_ENTRIES_PER_PAGE \ |
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(VMW_PAGE_SIZE / sizeof(PVSCSIRingCmpDesc)) |
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|
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#define PVSCSI_MAX_NUM_MSG_ENTRIES_PER_PAGE \ |
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(VMW_PAGE_SIZE / sizeof(PVSCSIRingMsgDesc)) |
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|
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#define PVSCSI_MAX_REQ_QUEUE_DEPTH \ |
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(PVSCSI_MAX_NUM_PAGES_REQ_RING * PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE) |
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|
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#define PVSCSI_MEM_SPACE_COMMAND_NUM_PAGES 1 |
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#define PVSCSI_MEM_SPACE_INTR_STATUS_NUM_PAGES 1 |
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#define PVSCSI_MEM_SPACE_MISC_NUM_PAGES 2 |
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#define PVSCSI_MEM_SPACE_KICK_IO_NUM_PAGES 2 |
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#define PVSCSI_MEM_SPACE_MSIX_NUM_PAGES 2 |
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|
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enum PVSCSIMemSpace { |
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PVSCSI_MEM_SPACE_COMMAND_PAGE = 0, |
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PVSCSI_MEM_SPACE_INTR_STATUS_PAGE = 1, |
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PVSCSI_MEM_SPACE_MISC_PAGE = 2, |
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PVSCSI_MEM_SPACE_KICK_IO_PAGE = 4, |
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PVSCSI_MEM_SPACE_MSIX_TABLE_PAGE = 6, |
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PVSCSI_MEM_SPACE_MSIX_PBA_PAGE = 7, |
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}; |
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|
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#define PVSCSI_MEM_SPACE_NUM_PAGES \ |
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(PVSCSI_MEM_SPACE_COMMAND_NUM_PAGES + \ |
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PVSCSI_MEM_SPACE_INTR_STATUS_NUM_PAGES + \ |
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PVSCSI_MEM_SPACE_MISC_NUM_PAGES + \ |
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PVSCSI_MEM_SPACE_KICK_IO_NUM_PAGES + \ |
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PVSCSI_MEM_SPACE_MSIX_NUM_PAGES) |
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|
|||
#define PVSCSI_MEM_SPACE_SIZE (PVSCSI_MEM_SPACE_NUM_PAGES * VMW_PAGE_SIZE) |
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|
|||
#endif /* VMW_PVSCSI_H */ |
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Reference in new issue