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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Linus Torvalds](/assets/img/avatar_default.png)
This topic branch covers a fundamental change in how our sg lists are allocated to make mq more efficient by reducing the size of the preallocated sg list. This necessitates a large number of driver changes because the previous guarantee that if a driver specified SG_ALL as the size of its scatter list, it would get a non-chained list and didn't need to bother with scatterlist iterators is now broken and every driver *must* use scatterlist iterators. This was broken out as a separate topic because we need to convert all the drivers before pulling the trigger and unconverted drivers kept being found, necessitating a rebase. Signed-off-by: James E.J. Bottomley <jejb@linux.ibm.com> -----BEGIN PGP SIGNATURE----- iJwEABMIAEQWIQTnYEDbdso9F2cI+arnQslM7pishQUCXSTzzCYcamFtZXMuYm90 dG9tbGV5QGhhbnNlbnBhcnRuZXJzaGlwLmNvbQAKCRDnQslM7pishZB+AP9I8j/s wWfg0Z3WNuf4D5I3rH4x1J3cQTqPJed+RjwgcQEA1gZvtOTg1ZEn/CYMVnaB92x0 t6MZSchIaFXeqfD+E7U= =cv8o -----END PGP SIGNATURE----- Merge tag 'scsi-sg' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi Pull SCSI scatter-gather list updates from James Bottomley: "This topic branch covers a fundamental change in how our sg lists are allocated to make mq more efficient by reducing the size of the preallocated sg list. This necessitates a large number of driver changes because the previous guarantee that if a driver specified SG_ALL as the size of its scatter list, it would get a non-chained list and didn't need to bother with scatterlist iterators is now broken and every driver *must* use scatterlist iterators. This was broken out as a separate topic because we need to convert all the drivers before pulling the trigger and unconverted drivers kept being found, necessitating a rebase" * tag 'scsi-sg' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (21 commits) scsi: core: don't preallocate small SGL in case of NO_SG_CHAIN scsi: lib/sg_pool.c: clear 'first_chunk' in case of no preallocation scsi: core: avoid preallocating big SGL for data scsi: core: avoid preallocating big SGL for protection information scsi: lib/sg_pool.c: improve APIs for allocating sg pool scsi: esp: use sg helper to iterate over scatterlist scsi: NCR5380: use sg helper to iterate over scatterlist scsi: wd33c93: use sg helper to iterate over scatterlist scsi: ppa: use sg helper to iterate over scatterlist scsi: pcmcia: nsp_cs: use sg helper to iterate over scatterlist scsi: imm: use sg helper to iterate over scatterlist scsi: aha152x: use sg helper to iterate over scatterlist scsi: s390: zfcp_fc: use sg helper to iterate over scatterlist scsi: staging: unisys: visorhba: use sg helper to iterate over scatterlist scsi: usb: image: microtek: use sg helper to iterate over scatterlist scsi: pmcraid: use sg helper to iterate over scatterlist scsi: ipr: use sg helper to iterate over scatterlist scsi: mvumi: use sg helper to iterate over scatterlist scsi: lpfc: use sg helper to iterate over scatterlist scsi: advansys: use sg helper to iterate over scatterlist ...
1608 lines
43 KiB
C
1608 lines
43 KiB
C
/*
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* Linux driver for VMware's para-virtualized SCSI HBA.
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*
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* Copyright (C) 2008-2014, 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: Jim Gill <jgill@vmware.com>
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include <linux/pci.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_tcq.h>
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#include "vmw_pvscsi.h"
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#define PVSCSI_LINUX_DRIVER_DESC "VMware PVSCSI driver"
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MODULE_DESCRIPTION(PVSCSI_LINUX_DRIVER_DESC);
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MODULE_AUTHOR("VMware, Inc.");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(PVSCSI_DRIVER_VERSION_STRING);
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#define PVSCSI_DEFAULT_NUM_PAGES_PER_RING 8
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#define PVSCSI_DEFAULT_NUM_PAGES_MSG_RING 1
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#define PVSCSI_DEFAULT_QUEUE_DEPTH 254
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#define SGL_SIZE PAGE_SIZE
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struct pvscsi_sg_list {
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struct PVSCSISGElement sge[PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT];
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};
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struct pvscsi_ctx {
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/*
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* The index of the context in cmd_map serves as the context ID for a
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* 1-to-1 mapping completions back to requests.
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*/
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struct scsi_cmnd *cmd;
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struct pvscsi_sg_list *sgl;
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struct list_head list;
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dma_addr_t dataPA;
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dma_addr_t sensePA;
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dma_addr_t sglPA;
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struct completion *abort_cmp;
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};
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struct pvscsi_adapter {
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char *mmioBase;
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u8 rev;
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bool use_msg;
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bool use_req_threshold;
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spinlock_t hw_lock;
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struct workqueue_struct *workqueue;
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struct work_struct work;
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struct PVSCSIRingReqDesc *req_ring;
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unsigned req_pages;
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unsigned req_depth;
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dma_addr_t reqRingPA;
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struct PVSCSIRingCmpDesc *cmp_ring;
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unsigned cmp_pages;
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dma_addr_t cmpRingPA;
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struct PVSCSIRingMsgDesc *msg_ring;
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unsigned msg_pages;
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dma_addr_t msgRingPA;
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struct PVSCSIRingsState *rings_state;
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dma_addr_t ringStatePA;
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struct pci_dev *dev;
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struct Scsi_Host *host;
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struct list_head cmd_pool;
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struct pvscsi_ctx *cmd_map;
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};
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/* Command line parameters */
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static int pvscsi_ring_pages;
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static int pvscsi_msg_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_MSG_RING;
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static int pvscsi_cmd_per_lun = PVSCSI_DEFAULT_QUEUE_DEPTH;
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static bool pvscsi_disable_msi;
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static bool pvscsi_disable_msix;
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static bool pvscsi_use_msg = true;
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static bool pvscsi_use_req_threshold = true;
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#define PVSCSI_RW (S_IRUSR | S_IWUSR)
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module_param_named(ring_pages, pvscsi_ring_pages, int, PVSCSI_RW);
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MODULE_PARM_DESC(ring_pages, "Number of pages per req/cmp ring - (default="
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__stringify(PVSCSI_DEFAULT_NUM_PAGES_PER_RING)
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"[up to 16 targets],"
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__stringify(PVSCSI_SETUP_RINGS_MAX_NUM_PAGES)
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"[for 16+ targets])");
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module_param_named(msg_ring_pages, pvscsi_msg_ring_pages, int, PVSCSI_RW);
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MODULE_PARM_DESC(msg_ring_pages, "Number of pages for the msg ring - (default="
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__stringify(PVSCSI_DEFAULT_NUM_PAGES_MSG_RING) ")");
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module_param_named(cmd_per_lun, pvscsi_cmd_per_lun, int, PVSCSI_RW);
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MODULE_PARM_DESC(cmd_per_lun, "Maximum commands per lun - (default="
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__stringify(PVSCSI_DEFAULT_QUEUE_DEPTH) ")");
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module_param_named(disable_msi, pvscsi_disable_msi, bool, PVSCSI_RW);
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MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)");
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module_param_named(disable_msix, pvscsi_disable_msix, bool, PVSCSI_RW);
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MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)");
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module_param_named(use_msg, pvscsi_use_msg, bool, PVSCSI_RW);
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MODULE_PARM_DESC(use_msg, "Use msg ring when available - (default=1)");
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module_param_named(use_req_threshold, pvscsi_use_req_threshold,
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bool, PVSCSI_RW);
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MODULE_PARM_DESC(use_req_threshold, "Use driver-based request coalescing if configured - (default=1)");
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static const struct pci_device_id pvscsi_pci_tbl[] = {
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{ PCI_VDEVICE(VMWARE, PCI_DEVICE_ID_VMWARE_PVSCSI) },
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{ 0 }
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};
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MODULE_DEVICE_TABLE(pci, pvscsi_pci_tbl);
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static struct device *
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pvscsi_dev(const struct pvscsi_adapter *adapter)
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{
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return &(adapter->dev->dev);
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}
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static struct pvscsi_ctx *
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pvscsi_find_context(const struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd)
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{
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struct pvscsi_ctx *ctx, *end;
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end = &adapter->cmd_map[adapter->req_depth];
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for (ctx = adapter->cmd_map; ctx < end; ctx++)
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if (ctx->cmd == cmd)
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return ctx;
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return NULL;
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}
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static struct pvscsi_ctx *
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pvscsi_acquire_context(struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd)
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{
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struct pvscsi_ctx *ctx;
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if (list_empty(&adapter->cmd_pool))
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return NULL;
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ctx = list_first_entry(&adapter->cmd_pool, struct pvscsi_ctx, list);
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ctx->cmd = cmd;
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list_del(&ctx->list);
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return ctx;
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}
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static void pvscsi_release_context(struct pvscsi_adapter *adapter,
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struct pvscsi_ctx *ctx)
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{
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ctx->cmd = NULL;
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ctx->abort_cmp = NULL;
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list_add(&ctx->list, &adapter->cmd_pool);
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}
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/*
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* Map a pvscsi_ctx struct to a context ID field value; we map to a simple
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* non-zero integer. ctx always points to an entry in cmd_map array, hence
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* the return value is always >=1.
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*/
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static u64 pvscsi_map_context(const struct pvscsi_adapter *adapter,
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const struct pvscsi_ctx *ctx)
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{
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return ctx - adapter->cmd_map + 1;
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}
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static struct pvscsi_ctx *
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pvscsi_get_context(const struct pvscsi_adapter *adapter, u64 context)
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{
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return &adapter->cmd_map[context - 1];
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}
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static void pvscsi_reg_write(const struct pvscsi_adapter *adapter,
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u32 offset, u32 val)
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{
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writel(val, adapter->mmioBase + offset);
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}
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static u32 pvscsi_reg_read(const struct pvscsi_adapter *adapter, u32 offset)
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{
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return readl(adapter->mmioBase + offset);
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}
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static u32 pvscsi_read_intr_status(const struct pvscsi_adapter *adapter)
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{
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return pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_INTR_STATUS);
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}
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static void pvscsi_write_intr_status(const struct pvscsi_adapter *adapter,
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u32 val)
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{
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pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_STATUS, val);
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}
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static void pvscsi_unmask_intr(const struct pvscsi_adapter *adapter)
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{
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u32 intr_bits;
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intr_bits = PVSCSI_INTR_CMPL_MASK;
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if (adapter->use_msg)
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intr_bits |= PVSCSI_INTR_MSG_MASK;
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pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, intr_bits);
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}
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static void pvscsi_mask_intr(const struct pvscsi_adapter *adapter)
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{
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pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, 0);
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}
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static void pvscsi_write_cmd_desc(const struct pvscsi_adapter *adapter,
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u32 cmd, const void *desc, size_t len)
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{
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const u32 *ptr = desc;
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size_t i;
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len /= sizeof(*ptr);
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pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND, cmd);
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for (i = 0; i < len; i++)
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pvscsi_reg_write(adapter,
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PVSCSI_REG_OFFSET_COMMAND_DATA, ptr[i]);
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}
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static void pvscsi_abort_cmd(const struct pvscsi_adapter *adapter,
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const struct pvscsi_ctx *ctx)
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{
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struct PVSCSICmdDescAbortCmd cmd = { 0 };
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cmd.target = ctx->cmd->device->id;
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cmd.context = pvscsi_map_context(adapter, ctx);
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pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ABORT_CMD, &cmd, sizeof(cmd));
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}
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static void pvscsi_kick_rw_io(const struct pvscsi_adapter *adapter)
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{
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pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_RW_IO, 0);
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}
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static void pvscsi_process_request_ring(const struct pvscsi_adapter *adapter)
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{
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pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_NON_RW_IO, 0);
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}
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static int scsi_is_rw(unsigned char op)
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{
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return op == READ_6 || op == WRITE_6 ||
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op == READ_10 || op == WRITE_10 ||
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op == READ_12 || op == WRITE_12 ||
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op == READ_16 || op == WRITE_16;
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}
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static void pvscsi_kick_io(const struct pvscsi_adapter *adapter,
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unsigned char op)
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{
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if (scsi_is_rw(op)) {
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struct PVSCSIRingsState *s = adapter->rings_state;
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if (!adapter->use_req_threshold ||
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s->reqProdIdx - s->reqConsIdx >= s->reqCallThreshold)
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pvscsi_kick_rw_io(adapter);
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} else {
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pvscsi_process_request_ring(adapter);
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}
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}
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static void ll_adapter_reset(const struct pvscsi_adapter *adapter)
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{
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dev_dbg(pvscsi_dev(adapter), "Adapter Reset on %p\n", adapter);
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pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ADAPTER_RESET, NULL, 0);
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}
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static void ll_bus_reset(const struct pvscsi_adapter *adapter)
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{
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dev_dbg(pvscsi_dev(adapter), "Resetting bus on %p\n", adapter);
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pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_BUS, NULL, 0);
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}
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static void ll_device_reset(const struct pvscsi_adapter *adapter, u32 target)
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{
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struct PVSCSICmdDescResetDevice cmd = { 0 };
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dev_dbg(pvscsi_dev(adapter), "Resetting device: target=%u\n", target);
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cmd.target = target;
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pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_DEVICE,
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&cmd, sizeof(cmd));
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}
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static void pvscsi_create_sg(struct pvscsi_ctx *ctx,
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struct scatterlist *sg, unsigned count)
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{
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unsigned i;
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struct PVSCSISGElement *sge;
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BUG_ON(count > PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT);
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sge = &ctx->sgl->sge[0];
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for (i = 0; i < count; i++, sg = sg_next(sg)) {
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sge[i].addr = sg_dma_address(sg);
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sge[i].length = sg_dma_len(sg);
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sge[i].flags = 0;
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}
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}
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/*
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* Map all data buffers for a command into PCI space and
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* setup the scatter/gather list if needed.
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*/
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static int pvscsi_map_buffers(struct pvscsi_adapter *adapter,
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struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd,
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struct PVSCSIRingReqDesc *e)
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{
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unsigned count;
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unsigned bufflen = scsi_bufflen(cmd);
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struct scatterlist *sg;
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e->dataLen = bufflen;
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e->dataAddr = 0;
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if (bufflen == 0)
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return 0;
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sg = scsi_sglist(cmd);
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count = scsi_sg_count(cmd);
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if (count != 0) {
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int segs = scsi_dma_map(cmd);
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if (segs == -ENOMEM) {
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scmd_printk(KERN_ERR, cmd,
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"vmw_pvscsi: Failed to map cmd sglist for DMA.\n");
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return -ENOMEM;
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} else if (segs > 1) {
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pvscsi_create_sg(ctx, sg, segs);
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e->flags |= PVSCSI_FLAG_CMD_WITH_SG_LIST;
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ctx->sglPA = dma_map_single(&adapter->dev->dev,
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ctx->sgl, SGL_SIZE, DMA_TO_DEVICE);
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if (dma_mapping_error(&adapter->dev->dev, ctx->sglPA)) {
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scmd_printk(KERN_ERR, cmd,
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"vmw_pvscsi: Failed to map ctx sglist for DMA.\n");
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scsi_dma_unmap(cmd);
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ctx->sglPA = 0;
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return -ENOMEM;
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}
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e->dataAddr = ctx->sglPA;
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} else
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e->dataAddr = sg_dma_address(sg);
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} else {
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/*
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* In case there is no S/G list, scsi_sglist points
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* directly to the buffer.
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*/
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ctx->dataPA = dma_map_single(&adapter->dev->dev, sg, bufflen,
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cmd->sc_data_direction);
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if (dma_mapping_error(&adapter->dev->dev, ctx->dataPA)) {
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scmd_printk(KERN_ERR, cmd,
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"vmw_pvscsi: Failed to map direct data buffer for DMA.\n");
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return -ENOMEM;
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}
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e->dataAddr = ctx->dataPA;
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}
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return 0;
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}
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|
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static void pvscsi_unmap_buffers(const struct pvscsi_adapter *adapter,
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struct pvscsi_ctx *ctx)
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{
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struct scsi_cmnd *cmd;
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unsigned bufflen;
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cmd = ctx->cmd;
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bufflen = scsi_bufflen(cmd);
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|
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if (bufflen != 0) {
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unsigned count = scsi_sg_count(cmd);
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|
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if (count != 0) {
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scsi_dma_unmap(cmd);
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if (ctx->sglPA) {
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dma_unmap_single(&adapter->dev->dev, ctx->sglPA,
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SGL_SIZE, DMA_TO_DEVICE);
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ctx->sglPA = 0;
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}
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} else
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dma_unmap_single(&adapter->dev->dev, ctx->dataPA,
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bufflen, cmd->sc_data_direction);
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}
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if (cmd->sense_buffer)
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dma_unmap_single(&adapter->dev->dev, ctx->sensePA,
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SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
|
|
}
|
|
|
|
static int pvscsi_allocate_rings(struct pvscsi_adapter *adapter)
|
|
{
|
|
adapter->rings_state = dma_alloc_coherent(&adapter->dev->dev, PAGE_SIZE,
|
|
&adapter->ringStatePA, GFP_KERNEL);
|
|
if (!adapter->rings_state)
|
|
return -ENOMEM;
|
|
|
|
adapter->req_pages = min(PVSCSI_MAX_NUM_PAGES_REQ_RING,
|
|
pvscsi_ring_pages);
|
|
adapter->req_depth = adapter->req_pages
|
|
* PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
|
|
adapter->req_ring = dma_alloc_coherent(&adapter->dev->dev,
|
|
adapter->req_pages * PAGE_SIZE, &adapter->reqRingPA,
|
|
GFP_KERNEL);
|
|
if (!adapter->req_ring)
|
|
return -ENOMEM;
|
|
|
|
adapter->cmp_pages = min(PVSCSI_MAX_NUM_PAGES_CMP_RING,
|
|
pvscsi_ring_pages);
|
|
adapter->cmp_ring = dma_alloc_coherent(&adapter->dev->dev,
|
|
adapter->cmp_pages * PAGE_SIZE, &adapter->cmpRingPA,
|
|
GFP_KERNEL);
|
|
if (!adapter->cmp_ring)
|
|
return -ENOMEM;
|
|
|
|
BUG_ON(!IS_ALIGNED(adapter->ringStatePA, PAGE_SIZE));
|
|
BUG_ON(!IS_ALIGNED(adapter->reqRingPA, PAGE_SIZE));
|
|
BUG_ON(!IS_ALIGNED(adapter->cmpRingPA, PAGE_SIZE));
|
|
|
|
if (!adapter->use_msg)
|
|
return 0;
|
|
|
|
adapter->msg_pages = min(PVSCSI_MAX_NUM_PAGES_MSG_RING,
|
|
pvscsi_msg_ring_pages);
|
|
adapter->msg_ring = dma_alloc_coherent(&adapter->dev->dev,
|
|
adapter->msg_pages * PAGE_SIZE, &adapter->msgRingPA,
|
|
GFP_KERNEL);
|
|
if (!adapter->msg_ring)
|
|
return -ENOMEM;
|
|
BUG_ON(!IS_ALIGNED(adapter->msgRingPA, PAGE_SIZE));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pvscsi_setup_all_rings(const struct pvscsi_adapter *adapter)
|
|
{
|
|
struct PVSCSICmdDescSetupRings cmd = { 0 };
|
|
dma_addr_t base;
|
|
unsigned i;
|
|
|
|
cmd.ringsStatePPN = adapter->ringStatePA >> PAGE_SHIFT;
|
|
cmd.reqRingNumPages = adapter->req_pages;
|
|
cmd.cmpRingNumPages = adapter->cmp_pages;
|
|
|
|
base = adapter->reqRingPA;
|
|
for (i = 0; i < adapter->req_pages; i++) {
|
|
cmd.reqRingPPNs[i] = base >> PAGE_SHIFT;
|
|
base += PAGE_SIZE;
|
|
}
|
|
|
|
base = adapter->cmpRingPA;
|
|
for (i = 0; i < adapter->cmp_pages; i++) {
|
|
cmd.cmpRingPPNs[i] = base >> PAGE_SHIFT;
|
|
base += PAGE_SIZE;
|
|
}
|
|
|
|
memset(adapter->rings_state, 0, PAGE_SIZE);
|
|
memset(adapter->req_ring, 0, adapter->req_pages * PAGE_SIZE);
|
|
memset(adapter->cmp_ring, 0, adapter->cmp_pages * PAGE_SIZE);
|
|
|
|
pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_SETUP_RINGS,
|
|
&cmd, sizeof(cmd));
|
|
|
|
if (adapter->use_msg) {
|
|
struct PVSCSICmdDescSetupMsgRing cmd_msg = { 0 };
|
|
|
|
cmd_msg.numPages = adapter->msg_pages;
|
|
|
|
base = adapter->msgRingPA;
|
|
for (i = 0; i < adapter->msg_pages; i++) {
|
|
cmd_msg.ringPPNs[i] = base >> PAGE_SHIFT;
|
|
base += PAGE_SIZE;
|
|
}
|
|
memset(adapter->msg_ring, 0, adapter->msg_pages * PAGE_SIZE);
|
|
|
|
pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_SETUP_MSG_RING,
|
|
&cmd_msg, sizeof(cmd_msg));
|
|
}
|
|
}
|
|
|
|
static int pvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth)
|
|
{
|
|
if (!sdev->tagged_supported)
|
|
qdepth = 1;
|
|
return scsi_change_queue_depth(sdev, qdepth);
|
|
}
|
|
|
|
/*
|
|
* Pull a completion descriptor off and pass the completion back
|
|
* to the SCSI mid layer.
|
|
*/
|
|
static void pvscsi_complete_request(struct pvscsi_adapter *adapter,
|
|
const struct PVSCSIRingCmpDesc *e)
|
|
{
|
|
struct pvscsi_ctx *ctx;
|
|
struct scsi_cmnd *cmd;
|
|
struct completion *abort_cmp;
|
|
u32 btstat = e->hostStatus;
|
|
u32 sdstat = e->scsiStatus;
|
|
|
|
ctx = pvscsi_get_context(adapter, e->context);
|
|
cmd = ctx->cmd;
|
|
abort_cmp = ctx->abort_cmp;
|
|
pvscsi_unmap_buffers(adapter, ctx);
|
|
pvscsi_release_context(adapter, ctx);
|
|
if (abort_cmp) {
|
|
/*
|
|
* The command was requested to be aborted. Just signal that
|
|
* the request completed and swallow the actual cmd completion
|
|
* here. The abort handler will post a completion for this
|
|
* command indicating that it got successfully aborted.
|
|
*/
|
|
complete(abort_cmp);
|
|
return;
|
|
}
|
|
|
|
cmd->result = 0;
|
|
if (sdstat != SAM_STAT_GOOD &&
|
|
(btstat == BTSTAT_SUCCESS ||
|
|
btstat == BTSTAT_LINKED_COMMAND_COMPLETED ||
|
|
btstat == BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG)) {
|
|
if (sdstat == SAM_STAT_COMMAND_TERMINATED) {
|
|
cmd->result = (DID_RESET << 16);
|
|
} else {
|
|
cmd->result = (DID_OK << 16) | sdstat;
|
|
if (sdstat == SAM_STAT_CHECK_CONDITION &&
|
|
cmd->sense_buffer)
|
|
cmd->result |= (DRIVER_SENSE << 24);
|
|
}
|
|
} else
|
|
switch (btstat) {
|
|
case BTSTAT_SUCCESS:
|
|
case BTSTAT_LINKED_COMMAND_COMPLETED:
|
|
case BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG:
|
|
/* If everything went fine, let's move on.. */
|
|
cmd->result = (DID_OK << 16);
|
|
break;
|
|
|
|
case BTSTAT_DATARUN:
|
|
case BTSTAT_DATA_UNDERRUN:
|
|
/* Report residual data in underruns */
|
|
scsi_set_resid(cmd, scsi_bufflen(cmd) - e->dataLen);
|
|
cmd->result = (DID_ERROR << 16);
|
|
break;
|
|
|
|
case BTSTAT_SELTIMEO:
|
|
/* Our emulation returns this for non-connected devs */
|
|
cmd->result = (DID_BAD_TARGET << 16);
|
|
break;
|
|
|
|
case BTSTAT_LUNMISMATCH:
|
|
case BTSTAT_TAGREJECT:
|
|
case BTSTAT_BADMSG:
|
|
cmd->result = (DRIVER_INVALID << 24);
|
|
/* fall through */
|
|
|
|
case BTSTAT_HAHARDWARE:
|
|
case BTSTAT_INVPHASE:
|
|
case BTSTAT_HATIMEOUT:
|
|
case BTSTAT_NORESPONSE:
|
|
case BTSTAT_DISCONNECT:
|
|
case BTSTAT_HASOFTWARE:
|
|
case BTSTAT_BUSFREE:
|
|
case BTSTAT_SENSFAILED:
|
|
cmd->result |= (DID_ERROR << 16);
|
|
break;
|
|
|
|
case BTSTAT_SENTRST:
|
|
case BTSTAT_RECVRST:
|
|
case BTSTAT_BUSRESET:
|
|
cmd->result = (DID_RESET << 16);
|
|
break;
|
|
|
|
case BTSTAT_ABORTQUEUE:
|
|
cmd->result = (DID_BUS_BUSY << 16);
|
|
break;
|
|
|
|
case BTSTAT_SCSIPARITY:
|
|
cmd->result = (DID_PARITY << 16);
|
|
break;
|
|
|
|
default:
|
|
cmd->result = (DID_ERROR << 16);
|
|
scmd_printk(KERN_DEBUG, cmd,
|
|
"Unknown completion status: 0x%x\n",
|
|
btstat);
|
|
}
|
|
|
|
dev_dbg(&cmd->device->sdev_gendev,
|
|
"cmd=%p %x ctx=%p result=0x%x status=0x%x,%x\n",
|
|
cmd, cmd->cmnd[0], ctx, cmd->result, btstat, sdstat);
|
|
|
|
cmd->scsi_done(cmd);
|
|
}
|
|
|
|
/*
|
|
* barrier usage : Since the PVSCSI device is emulated, there could be cases
|
|
* where we may want to serialize some accesses between the driver and the
|
|
* emulation layer. We use compiler barriers instead of the more expensive
|
|
* memory barriers because PVSCSI is only supported on X86 which has strong
|
|
* memory access ordering.
|
|
*/
|
|
static void pvscsi_process_completion_ring(struct pvscsi_adapter *adapter)
|
|
{
|
|
struct PVSCSIRingsState *s = adapter->rings_state;
|
|
struct PVSCSIRingCmpDesc *ring = adapter->cmp_ring;
|
|
u32 cmp_entries = s->cmpNumEntriesLog2;
|
|
|
|
while (s->cmpConsIdx != s->cmpProdIdx) {
|
|
struct PVSCSIRingCmpDesc *e = ring + (s->cmpConsIdx &
|
|
MASK(cmp_entries));
|
|
/*
|
|
* This barrier() ensures that *e is not dereferenced while
|
|
* the device emulation still writes data into the slot.
|
|
* Since the device emulation advances s->cmpProdIdx only after
|
|
* updating the slot we want to check it first.
|
|
*/
|
|
barrier();
|
|
pvscsi_complete_request(adapter, e);
|
|
/*
|
|
* This barrier() ensures that compiler doesn't reorder write
|
|
* to s->cmpConsIdx before the read of (*e) inside
|
|
* pvscsi_complete_request. Otherwise, device emulation may
|
|
* overwrite *e before we had a chance to read it.
|
|
*/
|
|
barrier();
|
|
s->cmpConsIdx++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Translate a Linux SCSI request into a request ring entry.
|
|
*/
|
|
static int pvscsi_queue_ring(struct pvscsi_adapter *adapter,
|
|
struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd)
|
|
{
|
|
struct PVSCSIRingsState *s;
|
|
struct PVSCSIRingReqDesc *e;
|
|
struct scsi_device *sdev;
|
|
u32 req_entries;
|
|
|
|
s = adapter->rings_state;
|
|
sdev = cmd->device;
|
|
req_entries = s->reqNumEntriesLog2;
|
|
|
|
/*
|
|
* If this condition holds, we might have room on the request ring, but
|
|
* we might not have room on the completion ring for the response.
|
|
* However, we have already ruled out this possibility - we would not
|
|
* have successfully allocated a context if it were true, since we only
|
|
* have one context per request entry. Check for it anyway, since it
|
|
* would be a serious bug.
|
|
*/
|
|
if (s->reqProdIdx - s->cmpConsIdx >= 1 << req_entries) {
|
|
scmd_printk(KERN_ERR, cmd, "vmw_pvscsi: "
|
|
"ring full: reqProdIdx=%d cmpConsIdx=%d\n",
|
|
s->reqProdIdx, s->cmpConsIdx);
|
|
return -1;
|
|
}
|
|
|
|
e = adapter->req_ring + (s->reqProdIdx & MASK(req_entries));
|
|
|
|
e->bus = sdev->channel;
|
|
e->target = sdev->id;
|
|
memset(e->lun, 0, sizeof(e->lun));
|
|
e->lun[1] = sdev->lun;
|
|
|
|
if (cmd->sense_buffer) {
|
|
ctx->sensePA = dma_map_single(&adapter->dev->dev,
|
|
cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE,
|
|
DMA_FROM_DEVICE);
|
|
if (dma_mapping_error(&adapter->dev->dev, ctx->sensePA)) {
|
|
scmd_printk(KERN_ERR, cmd,
|
|
"vmw_pvscsi: Failed to map sense buffer for DMA.\n");
|
|
ctx->sensePA = 0;
|
|
return -ENOMEM;
|
|
}
|
|
e->senseAddr = ctx->sensePA;
|
|
e->senseLen = SCSI_SENSE_BUFFERSIZE;
|
|
} else {
|
|
e->senseLen = 0;
|
|
e->senseAddr = 0;
|
|
}
|
|
e->cdbLen = cmd->cmd_len;
|
|
e->vcpuHint = smp_processor_id();
|
|
memcpy(e->cdb, cmd->cmnd, e->cdbLen);
|
|
|
|
e->tag = SIMPLE_QUEUE_TAG;
|
|
|
|
if (cmd->sc_data_direction == DMA_FROM_DEVICE)
|
|
e->flags = PVSCSI_FLAG_CMD_DIR_TOHOST;
|
|
else if (cmd->sc_data_direction == DMA_TO_DEVICE)
|
|
e->flags = PVSCSI_FLAG_CMD_DIR_TODEVICE;
|
|
else if (cmd->sc_data_direction == DMA_NONE)
|
|
e->flags = PVSCSI_FLAG_CMD_DIR_NONE;
|
|
else
|
|
e->flags = 0;
|
|
|
|
if (pvscsi_map_buffers(adapter, ctx, cmd, e) != 0) {
|
|
if (cmd->sense_buffer) {
|
|
dma_unmap_single(&adapter->dev->dev, ctx->sensePA,
|
|
SCSI_SENSE_BUFFERSIZE,
|
|
DMA_FROM_DEVICE);
|
|
ctx->sensePA = 0;
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
|
|
e->context = pvscsi_map_context(adapter, ctx);
|
|
|
|
barrier();
|
|
|
|
s->reqProdIdx++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pvscsi_queue_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
|
|
{
|
|
struct Scsi_Host *host = cmd->device->host;
|
|
struct pvscsi_adapter *adapter = shost_priv(host);
|
|
struct pvscsi_ctx *ctx;
|
|
unsigned long flags;
|
|
unsigned char op;
|
|
|
|
spin_lock_irqsave(&adapter->hw_lock, flags);
|
|
|
|
ctx = pvscsi_acquire_context(adapter, cmd);
|
|
if (!ctx || pvscsi_queue_ring(adapter, ctx, cmd) != 0) {
|
|
if (ctx)
|
|
pvscsi_release_context(adapter, ctx);
|
|
spin_unlock_irqrestore(&adapter->hw_lock, flags);
|
|
return SCSI_MLQUEUE_HOST_BUSY;
|
|
}
|
|
|
|
cmd->scsi_done = done;
|
|
op = cmd->cmnd[0];
|
|
|
|
dev_dbg(&cmd->device->sdev_gendev,
|
|
"queued cmd %p, ctx %p, op=%x\n", cmd, ctx, op);
|
|
|
|
spin_unlock_irqrestore(&adapter->hw_lock, flags);
|
|
|
|
pvscsi_kick_io(adapter, op);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static DEF_SCSI_QCMD(pvscsi_queue)
|
|
|
|
static int pvscsi_abort(struct scsi_cmnd *cmd)
|
|
{
|
|
struct pvscsi_adapter *adapter = shost_priv(cmd->device->host);
|
|
struct pvscsi_ctx *ctx;
|
|
unsigned long flags;
|
|
int result = SUCCESS;
|
|
DECLARE_COMPLETION_ONSTACK(abort_cmp);
|
|
int done;
|
|
|
|
scmd_printk(KERN_DEBUG, cmd, "task abort on host %u, %p\n",
|
|
adapter->host->host_no, cmd);
|
|
|
|
spin_lock_irqsave(&adapter->hw_lock, flags);
|
|
|
|
/*
|
|
* Poll the completion ring first - we might be trying to abort
|
|
* a command that is waiting to be dispatched in the completion ring.
|
|
*/
|
|
pvscsi_process_completion_ring(adapter);
|
|
|
|
/*
|
|
* If there is no context for the command, it either already succeeded
|
|
* or else was never properly issued. Not our problem.
|
|
*/
|
|
ctx = pvscsi_find_context(adapter, cmd);
|
|
if (!ctx) {
|
|
scmd_printk(KERN_DEBUG, cmd, "Failed to abort cmd %p\n", cmd);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Mark that the command has been requested to be aborted and issue
|
|
* the abort.
|
|
*/
|
|
ctx->abort_cmp = &abort_cmp;
|
|
|
|
pvscsi_abort_cmd(adapter, ctx);
|
|
spin_unlock_irqrestore(&adapter->hw_lock, flags);
|
|
/* Wait for 2 secs for the completion. */
|
|
done = wait_for_completion_timeout(&abort_cmp, msecs_to_jiffies(2000));
|
|
spin_lock_irqsave(&adapter->hw_lock, flags);
|
|
|
|
if (!done) {
|
|
/*
|
|
* Failed to abort the command, unmark the fact that it
|
|
* was requested to be aborted.
|
|
*/
|
|
ctx->abort_cmp = NULL;
|
|
result = FAILED;
|
|
scmd_printk(KERN_DEBUG, cmd,
|
|
"Failed to get completion for aborted cmd %p\n",
|
|
cmd);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Successfully aborted the command.
|
|
*/
|
|
cmd->result = (DID_ABORT << 16);
|
|
cmd->scsi_done(cmd);
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&adapter->hw_lock, flags);
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Abort all outstanding requests. This is only safe to use if the completion
|
|
* ring will never be walked again or the device has been reset, because it
|
|
* destroys the 1-1 mapping between context field passed to emulation and our
|
|
* request structure.
|
|
*/
|
|
static void pvscsi_reset_all(struct pvscsi_adapter *adapter)
|
|
{
|
|
unsigned i;
|
|
|
|
for (i = 0; i < adapter->req_depth; i++) {
|
|
struct pvscsi_ctx *ctx = &adapter->cmd_map[i];
|
|
struct scsi_cmnd *cmd = ctx->cmd;
|
|
if (cmd) {
|
|
scmd_printk(KERN_ERR, cmd,
|
|
"Forced reset on cmd %p\n", cmd);
|
|
pvscsi_unmap_buffers(adapter, ctx);
|
|
pvscsi_release_context(adapter, ctx);
|
|
cmd->result = (DID_RESET << 16);
|
|
cmd->scsi_done(cmd);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int pvscsi_host_reset(struct scsi_cmnd *cmd)
|
|
{
|
|
struct Scsi_Host *host = cmd->device->host;
|
|
struct pvscsi_adapter *adapter = shost_priv(host);
|
|
unsigned long flags;
|
|
bool use_msg;
|
|
|
|
scmd_printk(KERN_INFO, cmd, "SCSI Host reset\n");
|
|
|
|
spin_lock_irqsave(&adapter->hw_lock, flags);
|
|
|
|
use_msg = adapter->use_msg;
|
|
|
|
if (use_msg) {
|
|
adapter->use_msg = 0;
|
|
spin_unlock_irqrestore(&adapter->hw_lock, flags);
|
|
|
|
/*
|
|
* Now that we know that the ISR won't add more work on the
|
|
* workqueue we can safely flush any outstanding work.
|
|
*/
|
|
flush_workqueue(adapter->workqueue);
|
|
spin_lock_irqsave(&adapter->hw_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* We're going to tear down the entire ring structure and set it back
|
|
* up, so stalling new requests until all completions are flushed and
|
|
* the rings are back in place.
|
|
*/
|
|
|
|
pvscsi_process_request_ring(adapter);
|
|
|
|
ll_adapter_reset(adapter);
|
|
|
|
/*
|
|
* Now process any completions. Note we do this AFTER adapter reset,
|
|
* which is strange, but stops races where completions get posted
|
|
* between processing the ring and issuing the reset. The backend will
|
|
* not touch the ring memory after reset, so the immediately pre-reset
|
|
* completion ring state is still valid.
|
|
*/
|
|
pvscsi_process_completion_ring(adapter);
|
|
|
|
pvscsi_reset_all(adapter);
|
|
adapter->use_msg = use_msg;
|
|
pvscsi_setup_all_rings(adapter);
|
|
pvscsi_unmask_intr(adapter);
|
|
|
|
spin_unlock_irqrestore(&adapter->hw_lock, flags);
|
|
|
|
return SUCCESS;
|
|
}
|
|
|
|
static int pvscsi_bus_reset(struct scsi_cmnd *cmd)
|
|
{
|
|
struct Scsi_Host *host = cmd->device->host;
|
|
struct pvscsi_adapter *adapter = shost_priv(host);
|
|
unsigned long flags;
|
|
|
|
scmd_printk(KERN_INFO, cmd, "SCSI Bus reset\n");
|
|
|
|
/*
|
|
* We don't want to queue new requests for this bus after
|
|
* flushing all pending requests to emulation, since new
|
|
* requests could then sneak in during this bus reset phase,
|
|
* so take the lock now.
|
|
*/
|
|
spin_lock_irqsave(&adapter->hw_lock, flags);
|
|
|
|
pvscsi_process_request_ring(adapter);
|
|
ll_bus_reset(adapter);
|
|
pvscsi_process_completion_ring(adapter);
|
|
|
|
spin_unlock_irqrestore(&adapter->hw_lock, flags);
|
|
|
|
return SUCCESS;
|
|
}
|
|
|
|
static int pvscsi_device_reset(struct scsi_cmnd *cmd)
|
|
{
|
|
struct Scsi_Host *host = cmd->device->host;
|
|
struct pvscsi_adapter *adapter = shost_priv(host);
|
|
unsigned long flags;
|
|
|
|
scmd_printk(KERN_INFO, cmd, "SCSI device reset on scsi%u:%u\n",
|
|
host->host_no, cmd->device->id);
|
|
|
|
/*
|
|
* We don't want to queue new requests for this device after flushing
|
|
* all pending requests to emulation, since new requests could then
|
|
* sneak in during this device reset phase, so take the lock now.
|
|
*/
|
|
spin_lock_irqsave(&adapter->hw_lock, flags);
|
|
|
|
pvscsi_process_request_ring(adapter);
|
|
ll_device_reset(adapter, cmd->device->id);
|
|
pvscsi_process_completion_ring(adapter);
|
|
|
|
spin_unlock_irqrestore(&adapter->hw_lock, flags);
|
|
|
|
return SUCCESS;
|
|
}
|
|
|
|
static struct scsi_host_template pvscsi_template;
|
|
|
|
static const char *pvscsi_info(struct Scsi_Host *host)
|
|
{
|
|
struct pvscsi_adapter *adapter = shost_priv(host);
|
|
static char buf[256];
|
|
|
|
sprintf(buf, "VMware PVSCSI storage adapter rev %d, req/cmp/msg rings: "
|
|
"%u/%u/%u pages, cmd_per_lun=%u", adapter->rev,
|
|
adapter->req_pages, adapter->cmp_pages, adapter->msg_pages,
|
|
pvscsi_template.cmd_per_lun);
|
|
|
|
return buf;
|
|
}
|
|
|
|
static struct scsi_host_template pvscsi_template = {
|
|
.module = THIS_MODULE,
|
|
.name = "VMware PVSCSI Host Adapter",
|
|
.proc_name = "vmw_pvscsi",
|
|
.info = pvscsi_info,
|
|
.queuecommand = pvscsi_queue,
|
|
.this_id = -1,
|
|
.sg_tablesize = PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT,
|
|
.dma_boundary = UINT_MAX,
|
|
.max_sectors = 0xffff,
|
|
.change_queue_depth = pvscsi_change_queue_depth,
|
|
.eh_abort_handler = pvscsi_abort,
|
|
.eh_device_reset_handler = pvscsi_device_reset,
|
|
.eh_bus_reset_handler = pvscsi_bus_reset,
|
|
.eh_host_reset_handler = pvscsi_host_reset,
|
|
};
|
|
|
|
static void pvscsi_process_msg(const struct pvscsi_adapter *adapter,
|
|
const struct PVSCSIRingMsgDesc *e)
|
|
{
|
|
struct PVSCSIRingsState *s = adapter->rings_state;
|
|
struct Scsi_Host *host = adapter->host;
|
|
struct scsi_device *sdev;
|
|
|
|
printk(KERN_INFO "vmw_pvscsi: msg type: 0x%x - MSG RING: %u/%u (%u) \n",
|
|
e->type, s->msgProdIdx, s->msgConsIdx, s->msgNumEntriesLog2);
|
|
|
|
BUILD_BUG_ON(PVSCSI_MSG_LAST != 2);
|
|
|
|
if (e->type == PVSCSI_MSG_DEV_ADDED) {
|
|
struct PVSCSIMsgDescDevStatusChanged *desc;
|
|
desc = (struct PVSCSIMsgDescDevStatusChanged *)e;
|
|
|
|
printk(KERN_INFO
|
|
"vmw_pvscsi: msg: device added at scsi%u:%u:%u\n",
|
|
desc->bus, desc->target, desc->lun[1]);
|
|
|
|
if (!scsi_host_get(host))
|
|
return;
|
|
|
|
sdev = scsi_device_lookup(host, desc->bus, desc->target,
|
|
desc->lun[1]);
|
|
if (sdev) {
|
|
printk(KERN_INFO "vmw_pvscsi: device already exists\n");
|
|
scsi_device_put(sdev);
|
|
} else
|
|
scsi_add_device(adapter->host, desc->bus,
|
|
desc->target, desc->lun[1]);
|
|
|
|
scsi_host_put(host);
|
|
} else if (e->type == PVSCSI_MSG_DEV_REMOVED) {
|
|
struct PVSCSIMsgDescDevStatusChanged *desc;
|
|
desc = (struct PVSCSIMsgDescDevStatusChanged *)e;
|
|
|
|
printk(KERN_INFO
|
|
"vmw_pvscsi: msg: device removed at scsi%u:%u:%u\n",
|
|
desc->bus, desc->target, desc->lun[1]);
|
|
|
|
if (!scsi_host_get(host))
|
|
return;
|
|
|
|
sdev = scsi_device_lookup(host, desc->bus, desc->target,
|
|
desc->lun[1]);
|
|
if (sdev) {
|
|
scsi_remove_device(sdev);
|
|
scsi_device_put(sdev);
|
|
} else
|
|
printk(KERN_INFO
|
|
"vmw_pvscsi: failed to lookup scsi%u:%u:%u\n",
|
|
desc->bus, desc->target, desc->lun[1]);
|
|
|
|
scsi_host_put(host);
|
|
}
|
|
}
|
|
|
|
static int pvscsi_msg_pending(const struct pvscsi_adapter *adapter)
|
|
{
|
|
struct PVSCSIRingsState *s = adapter->rings_state;
|
|
|
|
return s->msgProdIdx != s->msgConsIdx;
|
|
}
|
|
|
|
static void pvscsi_process_msg_ring(const struct pvscsi_adapter *adapter)
|
|
{
|
|
struct PVSCSIRingsState *s = adapter->rings_state;
|
|
struct PVSCSIRingMsgDesc *ring = adapter->msg_ring;
|
|
u32 msg_entries = s->msgNumEntriesLog2;
|
|
|
|
while (pvscsi_msg_pending(adapter)) {
|
|
struct PVSCSIRingMsgDesc *e = ring + (s->msgConsIdx &
|
|
MASK(msg_entries));
|
|
|
|
barrier();
|
|
pvscsi_process_msg(adapter, e);
|
|
barrier();
|
|
s->msgConsIdx++;
|
|
}
|
|
}
|
|
|
|
static void pvscsi_msg_workqueue_handler(struct work_struct *data)
|
|
{
|
|
struct pvscsi_adapter *adapter;
|
|
|
|
adapter = container_of(data, struct pvscsi_adapter, work);
|
|
|
|
pvscsi_process_msg_ring(adapter);
|
|
}
|
|
|
|
static int pvscsi_setup_msg_workqueue(struct pvscsi_adapter *adapter)
|
|
{
|
|
char name[32];
|
|
|
|
if (!pvscsi_use_msg)
|
|
return 0;
|
|
|
|
pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND,
|
|
PVSCSI_CMD_SETUP_MSG_RING);
|
|
|
|
if (pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_COMMAND_STATUS) == -1)
|
|
return 0;
|
|
|
|
snprintf(name, sizeof(name),
|
|
"vmw_pvscsi_wq_%u", adapter->host->host_no);
|
|
|
|
adapter->workqueue = create_singlethread_workqueue(name);
|
|
if (!adapter->workqueue) {
|
|
printk(KERN_ERR "vmw_pvscsi: failed to create work queue\n");
|
|
return 0;
|
|
}
|
|
INIT_WORK(&adapter->work, pvscsi_msg_workqueue_handler);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static bool pvscsi_setup_req_threshold(struct pvscsi_adapter *adapter,
|
|
bool enable)
|
|
{
|
|
u32 val;
|
|
|
|
if (!pvscsi_use_req_threshold)
|
|
return false;
|
|
|
|
pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND,
|
|
PVSCSI_CMD_SETUP_REQCALLTHRESHOLD);
|
|
val = pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_COMMAND_STATUS);
|
|
if (val == -1) {
|
|
printk(KERN_INFO "vmw_pvscsi: device does not support req_threshold\n");
|
|
return false;
|
|
} else {
|
|
struct PVSCSICmdDescSetupReqCall cmd_msg = { 0 };
|
|
cmd_msg.enable = enable;
|
|
printk(KERN_INFO
|
|
"vmw_pvscsi: %sabling reqCallThreshold\n",
|
|
enable ? "en" : "dis");
|
|
pvscsi_write_cmd_desc(adapter,
|
|
PVSCSI_CMD_SETUP_REQCALLTHRESHOLD,
|
|
&cmd_msg, sizeof(cmd_msg));
|
|
return pvscsi_reg_read(adapter,
|
|
PVSCSI_REG_OFFSET_COMMAND_STATUS) != 0;
|
|
}
|
|
}
|
|
|
|
static irqreturn_t pvscsi_isr(int irq, void *devp)
|
|
{
|
|
struct pvscsi_adapter *adapter = devp;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&adapter->hw_lock, flags);
|
|
pvscsi_process_completion_ring(adapter);
|
|
if (adapter->use_msg && pvscsi_msg_pending(adapter))
|
|
queue_work(adapter->workqueue, &adapter->work);
|
|
spin_unlock_irqrestore(&adapter->hw_lock, flags);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t pvscsi_shared_isr(int irq, void *devp)
|
|
{
|
|
struct pvscsi_adapter *adapter = devp;
|
|
u32 val = pvscsi_read_intr_status(adapter);
|
|
|
|
if (!(val & PVSCSI_INTR_ALL_SUPPORTED))
|
|
return IRQ_NONE;
|
|
pvscsi_write_intr_status(devp, val);
|
|
return pvscsi_isr(irq, devp);
|
|
}
|
|
|
|
static void pvscsi_free_sgls(const struct pvscsi_adapter *adapter)
|
|
{
|
|
struct pvscsi_ctx *ctx = adapter->cmd_map;
|
|
unsigned i;
|
|
|
|
for (i = 0; i < adapter->req_depth; ++i, ++ctx)
|
|
free_pages((unsigned long)ctx->sgl, get_order(SGL_SIZE));
|
|
}
|
|
|
|
static void pvscsi_shutdown_intr(struct pvscsi_adapter *adapter)
|
|
{
|
|
free_irq(pci_irq_vector(adapter->dev, 0), adapter);
|
|
pci_free_irq_vectors(adapter->dev);
|
|
}
|
|
|
|
static void pvscsi_release_resources(struct pvscsi_adapter *adapter)
|
|
{
|
|
if (adapter->workqueue)
|
|
destroy_workqueue(adapter->workqueue);
|
|
|
|
if (adapter->mmioBase)
|
|
pci_iounmap(adapter->dev, adapter->mmioBase);
|
|
|
|
pci_release_regions(adapter->dev);
|
|
|
|
if (adapter->cmd_map) {
|
|
pvscsi_free_sgls(adapter);
|
|
kfree(adapter->cmd_map);
|
|
}
|
|
|
|
if (adapter->rings_state)
|
|
dma_free_coherent(&adapter->dev->dev, PAGE_SIZE,
|
|
adapter->rings_state, adapter->ringStatePA);
|
|
|
|
if (adapter->req_ring)
|
|
dma_free_coherent(&adapter->dev->dev,
|
|
adapter->req_pages * PAGE_SIZE,
|
|
adapter->req_ring, adapter->reqRingPA);
|
|
|
|
if (adapter->cmp_ring)
|
|
dma_free_coherent(&adapter->dev->dev,
|
|
adapter->cmp_pages * PAGE_SIZE,
|
|
adapter->cmp_ring, adapter->cmpRingPA);
|
|
|
|
if (adapter->msg_ring)
|
|
dma_free_coherent(&adapter->dev->dev,
|
|
adapter->msg_pages * PAGE_SIZE,
|
|
adapter->msg_ring, adapter->msgRingPA);
|
|
}
|
|
|
|
/*
|
|
* Allocate scatter gather lists.
|
|
*
|
|
* These are statically allocated. Trying to be clever was not worth it.
|
|
*
|
|
* Dynamic allocation can fail, and we can't go deep into the memory
|
|
* allocator, since we're a SCSI driver, and trying too hard to allocate
|
|
* memory might generate disk I/O. We also don't want to fail disk I/O
|
|
* in that case because we can't get an allocation - the I/O could be
|
|
* trying to swap out data to free memory. Since that is pathological,
|
|
* just use a statically allocated scatter list.
|
|
*
|
|
*/
|
|
static int pvscsi_allocate_sg(struct pvscsi_adapter *adapter)
|
|
{
|
|
struct pvscsi_ctx *ctx;
|
|
int i;
|
|
|
|
ctx = adapter->cmd_map;
|
|
BUILD_BUG_ON(sizeof(struct pvscsi_sg_list) > SGL_SIZE);
|
|
|
|
for (i = 0; i < adapter->req_depth; ++i, ++ctx) {
|
|
ctx->sgl = (void *)__get_free_pages(GFP_KERNEL,
|
|
get_order(SGL_SIZE));
|
|
ctx->sglPA = 0;
|
|
BUG_ON(!IS_ALIGNED(((unsigned long)ctx->sgl), PAGE_SIZE));
|
|
if (!ctx->sgl) {
|
|
for (; i >= 0; --i, --ctx) {
|
|
free_pages((unsigned long)ctx->sgl,
|
|
get_order(SGL_SIZE));
|
|
ctx->sgl = NULL;
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Query the device, fetch the config info and return the
|
|
* maximum number of targets on the adapter. In case of
|
|
* failure due to any reason return default i.e. 16.
|
|
*/
|
|
static u32 pvscsi_get_max_targets(struct pvscsi_adapter *adapter)
|
|
{
|
|
struct PVSCSICmdDescConfigCmd cmd;
|
|
struct PVSCSIConfigPageHeader *header;
|
|
struct device *dev;
|
|
dma_addr_t configPagePA;
|
|
void *config_page;
|
|
u32 numPhys = 16;
|
|
|
|
dev = pvscsi_dev(adapter);
|
|
config_page = dma_alloc_coherent(&adapter->dev->dev, PAGE_SIZE,
|
|
&configPagePA, GFP_KERNEL);
|
|
if (!config_page) {
|
|
dev_warn(dev, "vmw_pvscsi: failed to allocate memory for config page\n");
|
|
goto exit;
|
|
}
|
|
BUG_ON(configPagePA & ~PAGE_MASK);
|
|
|
|
/* Fetch config info from the device. */
|
|
cmd.configPageAddress = ((u64)PVSCSI_CONFIG_CONTROLLER_ADDRESS) << 32;
|
|
cmd.configPageNum = PVSCSI_CONFIG_PAGE_CONTROLLER;
|
|
cmd.cmpAddr = configPagePA;
|
|
cmd._pad = 0;
|
|
|
|
/*
|
|
* Mark the completion page header with error values. If the device
|
|
* completes the command successfully, it sets the status values to
|
|
* indicate success.
|
|
*/
|
|
header = config_page;
|
|
memset(header, 0, sizeof *header);
|
|
header->hostStatus = BTSTAT_INVPARAM;
|
|
header->scsiStatus = SDSTAT_CHECK;
|
|
|
|
pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_CONFIG, &cmd, sizeof cmd);
|
|
|
|
if (header->hostStatus == BTSTAT_SUCCESS &&
|
|
header->scsiStatus == SDSTAT_GOOD) {
|
|
struct PVSCSIConfigPageController *config;
|
|
|
|
config = config_page;
|
|
numPhys = config->numPhys;
|
|
} else
|
|
dev_warn(dev, "vmw_pvscsi: PVSCSI_CMD_CONFIG failed. hostStatus = 0x%x, scsiStatus = 0x%x\n",
|
|
header->hostStatus, header->scsiStatus);
|
|
dma_free_coherent(&adapter->dev->dev, PAGE_SIZE, config_page,
|
|
configPagePA);
|
|
exit:
|
|
return numPhys;
|
|
}
|
|
|
|
static int pvscsi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
|
|
{
|
|
unsigned int irq_flag = PCI_IRQ_MSIX | PCI_IRQ_MSI | PCI_IRQ_LEGACY;
|
|
struct pvscsi_adapter *adapter;
|
|
struct pvscsi_adapter adapter_temp;
|
|
struct Scsi_Host *host = NULL;
|
|
unsigned int i;
|
|
int error;
|
|
u32 max_id;
|
|
|
|
error = -ENODEV;
|
|
|
|
if (pci_enable_device(pdev))
|
|
return error;
|
|
|
|
if (!dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64))) {
|
|
printk(KERN_INFO "vmw_pvscsi: using 64bit dma\n");
|
|
} else if (!dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32))) {
|
|
printk(KERN_INFO "vmw_pvscsi: using 32bit dma\n");
|
|
} else {
|
|
printk(KERN_ERR "vmw_pvscsi: failed to set DMA mask\n");
|
|
goto out_disable_device;
|
|
}
|
|
|
|
/*
|
|
* Let's use a temp pvscsi_adapter struct until we find the number of
|
|
* targets on the adapter, after that we will switch to the real
|
|
* allocated struct.
|
|
*/
|
|
adapter = &adapter_temp;
|
|
memset(adapter, 0, sizeof(*adapter));
|
|
adapter->dev = pdev;
|
|
adapter->rev = pdev->revision;
|
|
|
|
if (pci_request_regions(pdev, "vmw_pvscsi")) {
|
|
printk(KERN_ERR "vmw_pvscsi: pci memory selection failed\n");
|
|
goto out_disable_device;
|
|
}
|
|
|
|
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
|
|
if ((pci_resource_flags(pdev, i) & PCI_BASE_ADDRESS_SPACE_IO))
|
|
continue;
|
|
|
|
if (pci_resource_len(pdev, i) < PVSCSI_MEM_SPACE_SIZE)
|
|
continue;
|
|
|
|
break;
|
|
}
|
|
|
|
if (i == DEVICE_COUNT_RESOURCE) {
|
|
printk(KERN_ERR
|
|
"vmw_pvscsi: adapter has no suitable MMIO region\n");
|
|
goto out_release_resources_and_disable;
|
|
}
|
|
|
|
adapter->mmioBase = pci_iomap(pdev, i, PVSCSI_MEM_SPACE_SIZE);
|
|
|
|
if (!adapter->mmioBase) {
|
|
printk(KERN_ERR
|
|
"vmw_pvscsi: can't iomap for BAR %d memsize %lu\n",
|
|
i, PVSCSI_MEM_SPACE_SIZE);
|
|
goto out_release_resources_and_disable;
|
|
}
|
|
|
|
pci_set_master(pdev);
|
|
|
|
/*
|
|
* Ask the device for max number of targets before deciding the
|
|
* default pvscsi_ring_pages value.
|
|
*/
|
|
max_id = pvscsi_get_max_targets(adapter);
|
|
printk(KERN_INFO "vmw_pvscsi: max_id: %u\n", max_id);
|
|
|
|
if (pvscsi_ring_pages == 0)
|
|
/*
|
|
* Set the right default value. Up to 16 it is 8, above it is
|
|
* max.
|
|
*/
|
|
pvscsi_ring_pages = (max_id > 16) ?
|
|
PVSCSI_SETUP_RINGS_MAX_NUM_PAGES :
|
|
PVSCSI_DEFAULT_NUM_PAGES_PER_RING;
|
|
printk(KERN_INFO
|
|
"vmw_pvscsi: setting ring_pages to %d\n",
|
|
pvscsi_ring_pages);
|
|
|
|
pvscsi_template.can_queue =
|
|
min(PVSCSI_MAX_NUM_PAGES_REQ_RING, pvscsi_ring_pages) *
|
|
PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
|
|
pvscsi_template.cmd_per_lun =
|
|
min(pvscsi_template.can_queue, pvscsi_cmd_per_lun);
|
|
host = scsi_host_alloc(&pvscsi_template, sizeof(struct pvscsi_adapter));
|
|
if (!host) {
|
|
printk(KERN_ERR "vmw_pvscsi: failed to allocate host\n");
|
|
goto out_release_resources_and_disable;
|
|
}
|
|
|
|
/*
|
|
* Let's use the real pvscsi_adapter struct here onwards.
|
|
*/
|
|
adapter = shost_priv(host);
|
|
memset(adapter, 0, sizeof(*adapter));
|
|
adapter->dev = pdev;
|
|
adapter->host = host;
|
|
/*
|
|
* Copy back what we already have to the allocated adapter struct.
|
|
*/
|
|
adapter->rev = adapter_temp.rev;
|
|
adapter->mmioBase = adapter_temp.mmioBase;
|
|
|
|
spin_lock_init(&adapter->hw_lock);
|
|
host->max_channel = 0;
|
|
host->max_lun = 1;
|
|
host->max_cmd_len = 16;
|
|
host->max_id = max_id;
|
|
|
|
pci_set_drvdata(pdev, host);
|
|
|
|
ll_adapter_reset(adapter);
|
|
|
|
adapter->use_msg = pvscsi_setup_msg_workqueue(adapter);
|
|
|
|
error = pvscsi_allocate_rings(adapter);
|
|
if (error) {
|
|
printk(KERN_ERR "vmw_pvscsi: unable to allocate ring memory\n");
|
|
goto out_release_resources;
|
|
}
|
|
|
|
/*
|
|
* From this point on we should reset the adapter if anything goes
|
|
* wrong.
|
|
*/
|
|
pvscsi_setup_all_rings(adapter);
|
|
|
|
adapter->cmd_map = kcalloc(adapter->req_depth,
|
|
sizeof(struct pvscsi_ctx), GFP_KERNEL);
|
|
if (!adapter->cmd_map) {
|
|
printk(KERN_ERR "vmw_pvscsi: failed to allocate memory.\n");
|
|
error = -ENOMEM;
|
|
goto out_reset_adapter;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&adapter->cmd_pool);
|
|
for (i = 0; i < adapter->req_depth; i++) {
|
|
struct pvscsi_ctx *ctx = adapter->cmd_map + i;
|
|
list_add(&ctx->list, &adapter->cmd_pool);
|
|
}
|
|
|
|
error = pvscsi_allocate_sg(adapter);
|
|
if (error) {
|
|
printk(KERN_ERR "vmw_pvscsi: unable to allocate s/g table\n");
|
|
goto out_reset_adapter;
|
|
}
|
|
|
|
if (pvscsi_disable_msix)
|
|
irq_flag &= ~PCI_IRQ_MSIX;
|
|
if (pvscsi_disable_msi)
|
|
irq_flag &= ~PCI_IRQ_MSI;
|
|
|
|
error = pci_alloc_irq_vectors(adapter->dev, 1, 1, irq_flag);
|
|
if (error < 0)
|
|
goto out_reset_adapter;
|
|
|
|
adapter->use_req_threshold = pvscsi_setup_req_threshold(adapter, true);
|
|
printk(KERN_DEBUG "vmw_pvscsi: driver-based request coalescing %sabled\n",
|
|
adapter->use_req_threshold ? "en" : "dis");
|
|
|
|
if (adapter->dev->msix_enabled || adapter->dev->msi_enabled) {
|
|
printk(KERN_INFO "vmw_pvscsi: using MSI%s\n",
|
|
adapter->dev->msix_enabled ? "-X" : "");
|
|
error = request_irq(pci_irq_vector(pdev, 0), pvscsi_isr,
|
|
0, "vmw_pvscsi", adapter);
|
|
} else {
|
|
printk(KERN_INFO "vmw_pvscsi: using INTx\n");
|
|
error = request_irq(pci_irq_vector(pdev, 0), pvscsi_shared_isr,
|
|
IRQF_SHARED, "vmw_pvscsi", adapter);
|
|
}
|
|
|
|
if (error) {
|
|
printk(KERN_ERR
|
|
"vmw_pvscsi: unable to request IRQ: %d\n", error);
|
|
goto out_reset_adapter;
|
|
}
|
|
|
|
error = scsi_add_host(host, &pdev->dev);
|
|
if (error) {
|
|
printk(KERN_ERR
|
|
"vmw_pvscsi: scsi_add_host failed: %d\n", error);
|
|
goto out_reset_adapter;
|
|
}
|
|
|
|
dev_info(&pdev->dev, "VMware PVSCSI rev %d host #%u\n",
|
|
adapter->rev, host->host_no);
|
|
|
|
pvscsi_unmask_intr(adapter);
|
|
|
|
scsi_scan_host(host);
|
|
|
|
return 0;
|
|
|
|
out_reset_adapter:
|
|
ll_adapter_reset(adapter);
|
|
out_release_resources:
|
|
pvscsi_shutdown_intr(adapter);
|
|
pvscsi_release_resources(adapter);
|
|
scsi_host_put(host);
|
|
out_disable_device:
|
|
pci_disable_device(pdev);
|
|
|
|
return error;
|
|
|
|
out_release_resources_and_disable:
|
|
pvscsi_shutdown_intr(adapter);
|
|
pvscsi_release_resources(adapter);
|
|
goto out_disable_device;
|
|
}
|
|
|
|
static void __pvscsi_shutdown(struct pvscsi_adapter *adapter)
|
|
{
|
|
pvscsi_mask_intr(adapter);
|
|
|
|
if (adapter->workqueue)
|
|
flush_workqueue(adapter->workqueue);
|
|
|
|
pvscsi_shutdown_intr(adapter);
|
|
|
|
pvscsi_process_request_ring(adapter);
|
|
pvscsi_process_completion_ring(adapter);
|
|
ll_adapter_reset(adapter);
|
|
}
|
|
|
|
static void pvscsi_shutdown(struct pci_dev *dev)
|
|
{
|
|
struct Scsi_Host *host = pci_get_drvdata(dev);
|
|
struct pvscsi_adapter *adapter = shost_priv(host);
|
|
|
|
__pvscsi_shutdown(adapter);
|
|
}
|
|
|
|
static void pvscsi_remove(struct pci_dev *pdev)
|
|
{
|
|
struct Scsi_Host *host = pci_get_drvdata(pdev);
|
|
struct pvscsi_adapter *adapter = shost_priv(host);
|
|
|
|
scsi_remove_host(host);
|
|
|
|
__pvscsi_shutdown(adapter);
|
|
pvscsi_release_resources(adapter);
|
|
|
|
scsi_host_put(host);
|
|
|
|
pci_disable_device(pdev);
|
|
}
|
|
|
|
static struct pci_driver pvscsi_pci_driver = {
|
|
.name = "vmw_pvscsi",
|
|
.id_table = pvscsi_pci_tbl,
|
|
.probe = pvscsi_probe,
|
|
.remove = pvscsi_remove,
|
|
.shutdown = pvscsi_shutdown,
|
|
};
|
|
|
|
static int __init pvscsi_init(void)
|
|
{
|
|
pr_info("%s - version %s\n",
|
|
PVSCSI_LINUX_DRIVER_DESC, PVSCSI_DRIVER_VERSION_STRING);
|
|
return pci_register_driver(&pvscsi_pci_driver);
|
|
}
|
|
|
|
static void __exit pvscsi_exit(void)
|
|
{
|
|
pci_unregister_driver(&pvscsi_pci_driver);
|
|
}
|
|
|
|
module_init(pvscsi_init);
|
|
module_exit(pvscsi_exit);
|