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9526f36026
While running 'sg_reset -H' back to back the following exception was seen:
[ 735.115695] Faulting instruction address: 0xd0000000098c0864
cpu 0x0: Vector: 300 (Data Access) at [c000000ffffafa80]
pc: d0000000098c0864: cxlflash_async_err_irq+0x84/0x5c0 [cxlflash]
lr: c00000000013aed0: handle_irq_event_percpu+0xa0/0x310
sp: c000000ffffafd00
msr: 9000000000009033
dar: 2010000
dsisr: 40000000
current = 0xc000000001510880
paca = 0xc00000000fb80000 softe: 0 irq_happened: 0x01
pid = 0, comm = swapper/0
Linux version 4.5.0-491-26f710d+
enter ? for help
[c000000ffffafe10] c00000000013aed0 handle_irq_event_percpu+0xa0/0x310
[c000000ffffafed0] c00000000013b1a8 handle_irq_event+0x68/0xc0
[c000000ffffaff00] c0000000001404ec handle_fasteoi_irq+0xec/0x2a0
[c000000ffffaff30] c00000000013a084 generic_handle_irq+0x54/0x80
[c000000ffffaff60] c000000000011130 __do_irq+0x80/0x1d0
[c000000ffffaff90] c000000000024d40 call_do_irq+0x14/0x24
[c000000001573a20] c000000000011318 do_IRQ+0x98/0x140
[c000000001573a70] c000000000002594 hardware_interrupt_common+0x114/0x180
This exception is being hit because the async_err interrupt path performs
an MMIO to read the interrupt status register. The MMIO region in this
case is not available.
Commit 6ded8b3cbd ("cxlflash: Unmap problem state area before detaching
master context") re-ordered the sequence in which term_mc() and stop_afu()
are called. This introduces a window for interrupts to come in with the
problem space area unmapped, that did not exist previously.
The fix is to separate the disabling of all AFU interrupts to a distinct
function, term_intr() so that it is the first thing that is done in the
tear down process.
To keep the initialization process symmetric, separate the AFU interrupt
setup also to a distinct function: init_intr().
Fixes: 6ded8b3cbd ("cxlflash: Unmap problem state area before detaching master context")
Signed-off-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>
Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
/*
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* CXL Flash Device Driver
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*
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* Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation
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* Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
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*
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* Copyright (C) 2015 IBM Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _CXLFLASH_MAIN_H
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#define _CXLFLASH_MAIN_H
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#include <linux/list.h>
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#include <linux/types.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_device.h>
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#define CXLFLASH_NAME "cxlflash"
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#define CXLFLASH_ADAPTER_NAME "IBM POWER CXL Flash Adapter"
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#define PCI_DEVICE_ID_IBM_CORSA 0x04F0
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#define PCI_DEVICE_ID_IBM_FLASH_GT 0x0600
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/* Since there is only one target, make it 0 */
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#define CXLFLASH_TARGET 0
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#define CXLFLASH_MAX_CDB_LEN 16
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/* Really only one target per bus since the Texan is directly attached */
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#define CXLFLASH_MAX_NUM_TARGETS_PER_BUS 1
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#define CXLFLASH_MAX_NUM_LUNS_PER_TARGET 65536
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#define CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT (120 * HZ)
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#define NUM_FC_PORTS CXLFLASH_NUM_FC_PORTS /* ports per AFU */
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/* FC defines */
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#define FC_MTIP_CMDCONFIG 0x010
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#define FC_MTIP_STATUS 0x018
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#define FC_PNAME 0x300
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#define FC_CONFIG 0x320
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#define FC_CONFIG2 0x328
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#define FC_STATUS 0x330
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#define FC_ERROR 0x380
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#define FC_ERRCAP 0x388
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#define FC_ERRMSK 0x390
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#define FC_CNT_CRCERR 0x538
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#define FC_CRC_THRESH 0x580
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#define FC_MTIP_CMDCONFIG_ONLINE 0x20ULL
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#define FC_MTIP_CMDCONFIG_OFFLINE 0x40ULL
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#define FC_MTIP_STATUS_MASK 0x30ULL
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#define FC_MTIP_STATUS_ONLINE 0x20ULL
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#define FC_MTIP_STATUS_OFFLINE 0x10ULL
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/* TIMEOUT and RETRY definitions */
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/* AFU command timeout values */
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#define MC_AFU_SYNC_TIMEOUT 5 /* 5 secs */
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/* AFU command room retry limit */
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#define MC_ROOM_RETRY_CNT 10
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/* FC CRC clear periodic timer */
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#define MC_CRC_THRESH 100 /* threshold in 5 mins */
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#define FC_PORT_STATUS_RETRY_CNT 100 /* 100 100ms retries = 10 seconds */
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#define FC_PORT_STATUS_RETRY_INTERVAL_US 100000 /* microseconds */
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/* VPD defines */
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#define CXLFLASH_VPD_LEN 256
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#define WWPN_LEN 16
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#define WWPN_BUF_LEN (WWPN_LEN + 1)
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enum undo_level {
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UNDO_NOOP = 0,
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FREE_IRQ,
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UNMAP_ONE,
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UNMAP_TWO,
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UNMAP_THREE
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};
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struct dev_dependent_vals {
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u64 max_sectors;
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};
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struct asyc_intr_info {
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u64 status;
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char *desc;
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u8 port;
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u8 action;
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#define CLR_FC_ERROR 0x01
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#define LINK_RESET 0x02
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#define SCAN_HOST 0x04
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};
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#ifndef CONFIG_CXL_EEH
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#define cxl_perst_reloads_same_image(_a, _b) do { } while (0)
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#endif
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#endif /* _CXLFLASH_MAIN_H */
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