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Date: Wed, 30 Sep 2009 11:56:16 -0700
From: Alok Kataria <akataria@...are.com>
To: James Bottomley <James.Bottomley@...e.de>
Cc: Randy Dunlap <randy.dunlap@...cle.com>,
Mike Christie <michaelc@...wisc.edu>,
Bart Van Assche <bvanassche@....org>,
"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
Matthew Wilcox <matthew@....cx>,
"pv-drivers@...are.com" <pv-drivers@...are.com>,
Roland Dreier <rdreier@...co.com>,
LKML <linux-kernel@...r.kernel.org>,
"Chetan.Loke@...lex.Com" <Chetan.Loke@...lex.Com>,
Brian King <brking@...ux.vnet.ibm.com>,
Rolf Eike Beer <eike-kernel@...tec.de>,
Robert Love <robert.w.love@...el.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Daniel Walker <dwalker@...o99.com>, Greg KH <gregkh@...e.de>,
Chris Wright <chrisw@...s-sol.org>,
virtualization@...ts.osdl.org
Subject: Re: SCSI driver for VMware's virtual HBA - V5.
Forgot to copy the virtualization list..
On Wed, 2009-09-30 at 11:53 -0700, Alok Kataria wrote:
> Hi James,
>
> Given that their are no more modification requests, I think this driver
> should be ready for prime time now. I have incorporated the remaining
> few outstanding comments while rebasing the patch for 32-rc1.
>
> Please consider this for the SCSI tree. Also let me know if you have any
> feedback. Thanks.
>
> VMware PVSCSI driver - v5.
>
> Changelog (v5-v4)
> - use bool for pvscsi _disable_msi, _disable_msix, _use_msg
> - fix for 16 byte CDBs, max_cmd_len should be initialized to 16.
> - bump the driver version.
> - add <pv-drivers@...are.com> in the MAINTAINERS file.
> - rebase to 2.6.32-rc1.
>
> Changelog (v4-v3)
> - use size_t type for a loop iterator.
> - use IS_ALIGNED instead of ~PAGE_MASK, for alignment checks
> - use scsi_dma_ map/unmap API's
> - reduce the pvscsi_info buffer to 256 bytes
> - code cleanup in pvscsi_shutdown_intr
>
> Changelog (v3-v2)
> - use kmalloc for allocating sg_lists. And pci_map it for device access.
> - re-use pdev->revision for setting up adapter->rev.
>
> Changelog (v2-v1)
> - use PCI_VDEVICE instead of PCI_DEVICE.
> - use list_first_entry
> - use parenthesis for every sizeof usage
> - get rid of all #ifdef for CONFIG_PCI_MSI
> - use PVSCSI_MEM_SPACE_SIZE while checking for MMIO resource len.
> - use kcalloc instead of kmalloc.
> - replaced a couple of scmd_printk usage with dev_dbg
> - use dev_info and pr_info at couple of places.
> - add a comment to pvscsi_map_context
> - Add entry in MAINTAINERS.
>
> Patch applies on top of 2.6.32-rc1.
>
> --
>
> SCSI driver for VMware's virtual HBA.
>
> From: Alok N Kataria <akataria@...are.com>
>
> This is a driver for VMware's paravirtualized SCSI device,
> which should improve disk performance for guests running
> under control of VMware hypervisors that support such devices.
>
> Signed-off-by: Alok N Kataria <akataria@...are.com>
> ---
>
> MAINTAINERS | 8
> drivers/scsi/Kconfig | 8
> drivers/scsi/Makefile | 1
> drivers/scsi/pvscsi.c | 1393 +++++++++++++++++++++++++++++++++++++++++++++++++
> drivers/scsi/pvscsi.h | 397 ++++++++++++++
> 5 files changed, 1807 insertions(+), 0 deletions(-)
> create mode 100644 drivers/scsi/pvscsi.c
> create mode 100644 drivers/scsi/pvscsi.h
>
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index c450f3a..45de4b3 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -5608,6 +5608,14 @@ S: Maintained
> F: drivers/vlynq/vlynq.c
> F: include/linux/vlynq.h
>
> +VMware PVSCSI driver
> +M: Alok Kataria <akataria@...are.com>
> +M: VMware PV-Drivers <pv-drivers@...are.com>
> +L: linux-scsi@...r.kernel.org
> +S: Maintained
> +F: drivers/scsi/pvscsi.c
> +F: drivers/scsi/pvscsi.h
> +
> VOLTAGE AND CURRENT REGULATOR FRAMEWORK
> M: Liam Girdwood <lrg@...mlogic.co.uk>
> M: Mark Brown <broonie@...nsource.wolfsonmicro.com>
> diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
> index 82bb3b2..5a19ae0 100644
> --- a/drivers/scsi/Kconfig
> +++ b/drivers/scsi/Kconfig
> @@ -620,6 +620,14 @@ config SCSI_FLASHPOINT
> substantial, so users of MultiMaster Host Adapters may not
> wish to include it.
>
> +config VMWARE_PVSCSI
> + tristate "VMware PVSCSI driver support"
> + depends on PCI && SCSI && X86
> + help
> + This driver supports VMware's para virtualized SCSI HBA.
> + To compile this driver as a module, choose M here: the
> + module will be called pvscsi.
> +
> config LIBFC
> tristate "LibFC module"
> select SCSI_FC_ATTRS
> diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
> index 61a94af..8ddad00 100644
> --- a/drivers/scsi/Makefile
> +++ b/drivers/scsi/Makefile
> @@ -131,6 +131,7 @@ obj-$(CONFIG_PS3_ROM) += ps3rom.o
> obj-$(CONFIG_SCSI_CXGB3_ISCSI) += libiscsi.o libiscsi_tcp.o cxgb3i/
> obj-$(CONFIG_SCSI_BNX2_ISCSI) += libiscsi.o bnx2i/
> obj-$(CONFIG_SCSI_PMCRAID) += pmcraid.o
> +obj-$(CONFIG_VMWARE_PVSCSI) += pvscsi.o
>
> obj-$(CONFIG_ARM) += arm/
>
> diff --git a/drivers/scsi/pvscsi.c b/drivers/scsi/pvscsi.c
> new file mode 100644
> index 0000000..f0ba207
> --- /dev/null
> +++ b/drivers/scsi/pvscsi.c
> @@ -0,0 +1,1393 @@
> +/*
> + * Linux driver for VMware's para-virtualized SCSI HBA.
> + *
> + * Copyright (C) 2008-2009, VMware, Inc. All Rights Reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; version 2 of the License and no later version.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
> + * NON INFRINGEMENT. See the GNU General Public License for more
> + * details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
> + *
> + * Maintained by: Alok N Kataria <akataria@...are.com>
> + *
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/moduleparam.h>
> +#include <linux/types.h>
> +#include <linux/interrupt.h>
> +#include <linux/workqueue.h>
> +#include <linux/pci.h>
> +
> +#include <scsi/scsi.h>
> +#include <scsi/scsi_host.h>
> +#include <scsi/scsi_cmnd.h>
> +#include <scsi/scsi_device.h>
> +
> +#include "pvscsi.h"
> +
> +#define PVSCSI_LINUX_DRIVER_DESC "VMware PVSCSI driver"
> +
> +MODULE_DESCRIPTION(PVSCSI_LINUX_DRIVER_DESC);
> +MODULE_AUTHOR("VMware, Inc.");
> +MODULE_LICENSE("GPL");
> +MODULE_VERSION(PVSCSI_DRIVER_VERSION_STRING);
> +
> +#define PVSCSI_DEFAULT_NUM_PAGES_PER_RING 8
> +#define PVSCSI_DEFAULT_NUM_PAGES_MSG_RING 1
> +#define PVSCSI_DEFAULT_QUEUE_DEPTH 64
> +#define SGL_SIZE PAGE_SIZE
> +
> +#define pvscsi_dev(adapter) (&(adapter->dev->dev))
> +
> +struct pvscsi_sg_list {
> + struct PVSCSISGElement sge[PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT];
> +};
> +
> +struct pvscsi_ctx {
> + /*
> + * The index of the context in cmd_map serves as the context ID for a
> + * 1-to-1 mapping completions back to requests.
> + */
> + struct scsi_cmnd *cmd;
> + struct pvscsi_sg_list *sgl;
> + struct list_head list;
> + dma_addr_t dataPA;
> + dma_addr_t sensePA;
> + dma_addr_t sglPA;
> +};
> +
> +struct pvscsi_adapter {
> + char *mmioBase;
> + unsigned int irq;
> + u8 rev;
> + bool use_msi;
> + bool use_msix;
> + bool use_msg;
> +
> + spinlock_t hw_lock;
> +
> + struct workqueue_struct *workqueue;
> + struct work_struct work;
> +
> + struct PVSCSIRingReqDesc *req_ring;
> + unsigned req_pages;
> + unsigned req_depth;
> + dma_addr_t reqRingPA;
> +
> + struct PVSCSIRingCmpDesc *cmp_ring;
> + unsigned cmp_pages;
> + dma_addr_t cmpRingPA;
> +
> + struct PVSCSIRingMsgDesc *msg_ring;
> + unsigned msg_pages;
> + dma_addr_t msgRingPA;
> +
> + struct PVSCSIRingsState *rings_state;
> + dma_addr_t ringStatePA;
> +
> + struct pci_dev *dev;
> + struct Scsi_Host *host;
> +
> + struct list_head cmd_pool;
> + struct pvscsi_ctx *cmd_map;
> +};
> +
> +
> +/* Command line parameters */
> +static int pvscsi_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_PER_RING;
> +static int pvscsi_msg_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_MSG_RING;
> +static int pvscsi_cmd_per_lun = PVSCSI_DEFAULT_QUEUE_DEPTH;
> +static bool pvscsi_disable_msi;
> +static bool pvscsi_disable_msix;
> +static bool pvscsi_use_msg = true;
> +
> +#define PVSCSI_RW (S_IRUSR | S_IWUSR)
> +
> +module_param_named(ring_pages, pvscsi_ring_pages, int, PVSCSI_RW);
> +MODULE_PARM_DESC(ring_pages, "Number of pages per req/cmp ring - (default="
> + __stringify(PVSCSI_DEFAULT_NUM_PAGES_PER_RING) ")");
> +
> +module_param_named(msg_ring_pages, pvscsi_msg_ring_pages, int, PVSCSI_RW);
> +MODULE_PARM_DESC(msg_ring_pages, "Number of pages for the msg ring - (default="
> + __stringify(PVSCSI_DEFAULT_NUM_PAGES_MSG_RING) ")");
> +
> +module_param_named(cmd_per_lun, pvscsi_cmd_per_lun, int, PVSCSI_RW);
> +MODULE_PARM_DESC(cmd_per_lun, "Maximum commands per lun - (default="
> + __stringify(PVSCSI_MAX_REQ_QUEUE_DEPTH) ")");
> +
> +module_param_named(disable_msi, pvscsi_disable_msi, bool, PVSCSI_RW);
> +MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)");
> +
> +module_param_named(disable_msix, pvscsi_disable_msix, bool, PVSCSI_RW);
> +MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)");
> +
> +module_param_named(use_msg, pvscsi_use_msg, bool, PVSCSI_RW);
> +MODULE_PARM_DESC(use_msg, "Use msg ring when available - (default=1)");
> +
> +static const struct pci_device_id pvscsi_pci_tbl[] = {
> + { PCI_VDEVICE(VMWARE, PCI_DEVICE_ID_VMWARE_PVSCSI) },
> + { 0 }
> +};
> +
> +MODULE_DEVICE_TABLE(pci, pvscsi_pci_tbl);
> +
> +static struct pvscsi_ctx *
> +pvscsi_find_context(const struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd)
> +{
> + struct pvscsi_ctx *ctx, *end;
> +
> + end = &adapter->cmd_map[adapter->req_depth];
> + for (ctx = adapter->cmd_map; ctx < end; ctx++)
> + if (ctx->cmd == cmd)
> + return ctx;
> +
> + return NULL;
> +}
> +
> +static struct pvscsi_ctx *
> +pvscsi_acquire_context(struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd)
> +{
> + struct pvscsi_ctx *ctx;
> +
> + if (list_empty(&adapter->cmd_pool))
> + return NULL;
> +
> + ctx = list_first_entry(&adapter->cmd_pool, struct pvscsi_ctx, list);
> + ctx->cmd = cmd;
> + list_del(&ctx->list);
> +
> + return ctx;
> +}
> +
> +static void pvscsi_release_context(struct pvscsi_adapter *adapter,
> + struct pvscsi_ctx *ctx)
> +{
> + ctx->cmd = NULL;
> + list_add(&ctx->list, &adapter->cmd_pool);
> +}
> +
> +/*
> + * Map a pvscsi_ctx struct to a context ID field value; we map to a simple
> + * non-zero integer. ctx always points to an entry in cmd_map array, hence
> + * the return value is always >=1.
> + */
> +static u64 pvscsi_map_context(const struct pvscsi_adapter *adapter,
> + const struct pvscsi_ctx *ctx)
> +{
> + return ctx - adapter->cmd_map + 1;
> +}
> +
> +static struct pvscsi_ctx *
> +pvscsi_get_context(const struct pvscsi_adapter *adapter, u64 context)
> +{
> + return &adapter->cmd_map[context - 1];
> +}
> +
> +static void pvscsi_reg_write(const struct pvscsi_adapter *adapter,
> + u32 offset, u32 val)
> +{
> + writel(val, adapter->mmioBase + offset);
> +}
> +
> +static u32 pvscsi_reg_read(const struct pvscsi_adapter *adapter, u32 offset)
> +{
> + return readl(adapter->mmioBase + offset);
> +}
> +
> +static u32 pvscsi_read_intr_status(const struct pvscsi_adapter *adapter)
> +{
> + return pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_INTR_STATUS);
> +}
> +
> +static void pvscsi_write_intr_status(const struct pvscsi_adapter *adapter,
> + u32 val)
> +{
> + pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_STATUS, val);
> +}
> +
> +static void pvscsi_unmask_intr(const struct pvscsi_adapter *adapter)
> +{
> + u32 intr_bits;
> +
> + intr_bits = PVSCSI_INTR_CMPL_MASK;
> + if (adapter->use_msg)
> + intr_bits |= PVSCSI_INTR_MSG_MASK;
> +
> + pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, intr_bits);
> +}
> +
> +static void pvscsi_mask_intr(const struct pvscsi_adapter *adapter)
> +{
> + pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, 0);
> +}
> +
> +static void pvscsi_write_cmd_desc(const struct pvscsi_adapter *adapter,
> + u32 cmd, const void *desc, size_t len)
> +{
> + const u32 *ptr = desc;
> + size_t i;
> +
> + len /= sizeof(*ptr);
> + pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND, cmd);
> + for (i = 0; i < len; i++)
> + pvscsi_reg_write(adapter,
> + PVSCSI_REG_OFFSET_COMMAND_DATA, ptr[i]);
> +}
> +
> +static void pvscsi_abort_cmd(const struct pvscsi_adapter *adapter,
> + const struct pvscsi_ctx *ctx)
> +{
> + struct PVSCSICmdDescAbortCmd cmd = { 0 };
> +
> + cmd.target = ctx->cmd->device->id;
> + cmd.context = pvscsi_map_context(adapter, ctx);
> +
> + pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ABORT_CMD, &cmd, sizeof(cmd));
> +}
> +
> +static void pvscsi_kick_rw_io(const struct pvscsi_adapter *adapter)
> +{
> + pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_RW_IO, 0);
> +}
> +
> +static void pvscsi_process_request_ring(const struct pvscsi_adapter *adapter)
> +{
> + pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_NON_RW_IO, 0);
> +}
> +
> +static int scsi_is_rw(unsigned char op)
> +{
> + return op == READ_6 || op == WRITE_6 ||
> + op == READ_10 || op == WRITE_10 ||
> + op == READ_12 || op == WRITE_12 ||
> + op == READ_16 || op == WRITE_16;
> +}
> +
> +static void pvscsi_kick_io(const struct pvscsi_adapter *adapter,
> + unsigned char op)
> +{
> + if (scsi_is_rw(op))
> + pvscsi_kick_rw_io(adapter);
> + else
> + pvscsi_process_request_ring(adapter);
> +}
> +
> +static void ll_adapter_reset(const struct pvscsi_adapter *adapter)
> +{
> + dev_dbg(pvscsi_dev(adapter), "Adapter Reset on %p\n", adapter);
> +
> + pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ADAPTER_RESET, NULL, 0);
> +}
> +
> +static void ll_bus_reset(const struct pvscsi_adapter *adapter)
> +{
> + dev_dbg(pvscsi_dev(adapter), "Reseting bus on %p\n", adapter);
> +
> + pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_BUS, NULL, 0);
> +}
> +
> +static void ll_device_reset(const struct pvscsi_adapter *adapter, u32 target)
> +{
> + struct PVSCSICmdDescResetDevice cmd = { 0 };
> +
> + dev_dbg(pvscsi_dev(adapter), "Reseting device: target=%u\n", target);
> +
> + cmd.target = target;
> +
> + pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_DEVICE,
> + &cmd, sizeof(cmd));
> +}
> +
> +static void pvscsi_create_sg(struct pvscsi_ctx *ctx,
> + struct scatterlist *sg, unsigned count)
> +{
> + unsigned i;
> + struct PVSCSISGElement *sge;
> +
> + BUG_ON(count > PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT);
> +
> + sge = &ctx->sgl->sge[0];
> + for (i = 0; i < count; i++, sg++) {
> + sge[i].addr = sg_dma_address(sg);
> + sge[i].length = sg_dma_len(sg);
> + sge[i].flags = 0;
> + }
> +}
> +
> +/*
> + * Map all data buffers for a command into PCI space and
> + * setup the scatter/gather list if needed.
> + */
> +static void pvscsi_map_buffers(struct pvscsi_adapter *adapter,
> + struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd,
> + struct PVSCSIRingReqDesc *e)
> +{
> + unsigned count;
> + unsigned bufflen = scsi_bufflen(cmd);
> + struct scatterlist *sg;
> +
> + e->dataLen = bufflen;
> + e->dataAddr = 0;
> + if (bufflen == 0)
> + return;
> +
> + sg = scsi_sglist(cmd);
> + count = scsi_sg_count(cmd);
> + if (count != 0) {
> + int segs = scsi_dma_map(cmd);
> + if (segs > 1) {
> + pvscsi_create_sg(ctx, sg, segs);
> +
> + e->flags |= PVSCSI_FLAG_CMD_WITH_SG_LIST;
> + ctx->sglPA = pci_map_single(adapter->dev, ctx->sgl,
> + SGL_SIZE, PCI_DMA_TODEVICE);
> + e->dataAddr = ctx->sglPA;
> + } else
> + e->dataAddr = sg_dma_address(sg);
> + } else {
> + /*
> + * In case there is no S/G list, scsi_sglist points
> + * directly to the buffer.
> + */
> + ctx->dataPA = pci_map_single(adapter->dev, sg, bufflen,
> + cmd->sc_data_direction);
> + e->dataAddr = ctx->dataPA;
> + }
> +}
> +
> +static void pvscsi_unmap_buffers(const struct pvscsi_adapter *adapter,
> + struct pvscsi_ctx *ctx)
> +{
> + struct scsi_cmnd *cmd;
> + unsigned bufflen;
> +
> + cmd = ctx->cmd;
> + bufflen = scsi_bufflen(cmd);
> +
> + if (bufflen != 0) {
> + unsigned count = scsi_sg_count(cmd);
> +
> + if (count != 0) {
> + scsi_dma_unmap(cmd);
> + if (ctx->sglPA) {
> + pci_unmap_single(adapter->dev, ctx->sglPA,
> + SGL_SIZE, PCI_DMA_TODEVICE);
> + ctx->sglPA = 0;
> + }
> + } else
> + pci_unmap_single(adapter->dev, ctx->dataPA, bufflen,
> + cmd->sc_data_direction);
> + }
> + if (cmd->sense_buffer)
> + pci_unmap_single(adapter->dev, ctx->sensePA,
> + SCSI_SENSE_BUFFERSIZE, PCI_DMA_FROMDEVICE);
> +}
> +
> +static int __devinit pvscsi_allocate_rings(struct pvscsi_adapter *adapter)
> +{
> + adapter->rings_state = pci_alloc_consistent(adapter->dev, PAGE_SIZE,
> + &adapter->ringStatePA);
> + 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 = pci_alloc_consistent(adapter->dev,
> + adapter->req_pages * PAGE_SIZE,
> + &adapter->reqRingPA);
> + if (!adapter->req_ring)
> + return -ENOMEM;
> +
> + adapter->cmp_pages = min(PVSCSI_MAX_NUM_PAGES_CMP_RING,
> + pvscsi_ring_pages);
> + adapter->cmp_ring = pci_alloc_consistent(adapter->dev,
> + adapter->cmp_pages * PAGE_SIZE,
> + &adapter->cmpRingPA);
> + 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 = pci_alloc_consistent(adapter->dev,
> + adapter->msg_pages * PAGE_SIZE,
> + &adapter->msgRingPA);
> + 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));
> + }
> +}
> +
> +/*
> + * 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;
> + u32 btstat = e->hostStatus;
> + u32 sdstat = e->scsiStatus;
> +
> + ctx = pvscsi_get_context(adapter, e->context);
> + cmd = ctx->cmd;
> + pvscsi_unmap_buffers(adapter, ctx);
> + pvscsi_release_context(adapter, ctx);
> + cmd->result = 0;
> +
> + if (sdstat != SAM_STAT_GOOD &&
> + (btstat == BTSTAT_SUCCESS ||
> + btstat == BTSTAT_LINKED_COMMAND_COMPLETED ||
> + btstat == BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG)) {
> + 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_ABORT << 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,
> + "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 = pci_map_single(adapter->dev, cmd->sense_buffer,
> + SCSI_SENSE_BUFFERSIZE,
> + PCI_DMA_FROMDEVICE);
> + 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 (sdev->tagged_supported &&
> + (cmd->tag == HEAD_OF_QUEUE_TAG ||
> + cmd->tag == ORDERED_QUEUE_TAG))
> + e->tag = cmd->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;
> +
> + pvscsi_map_buffers(adapter, ctx, cmd, e);
> +
> + e->context = pvscsi_map_context(adapter, ctx);
> +
> + barrier();
> +
> + s->reqProdIdx++;
> +
> + return 0;
> +}
> +
> +static int pvscsi_queue(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;
> +
> + 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;
> +
> + dev_dbg(&cmd->device->sdev_gendev,
> + "queued cmd %p, ctx %p, op=%x\n", cmd, ctx, cmd->cmnd[0]);
> +
> + spin_unlock_irqrestore(&adapter->hw_lock, flags);
> +
> + pvscsi_kick_io(adapter, cmd->cmnd[0]);
> +
> + return 0;
> +}
> +
> +static int pvscsi_abort(struct scsi_cmnd *cmd)
> +{
> + struct pvscsi_adapter *adapter = shost_priv(cmd->device->host);
> + struct pvscsi_ctx *ctx;
> + unsigned long flags;
> +
> + 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;
> + }
> +
> + pvscsi_abort_cmd(adapter, ctx);
> +
> + pvscsi_process_completion_ring(adapter);
> +
> +out:
> + spin_unlock_irqrestore(&adapter->hw_lock, flags);
> + return SUCCESS;
> +}
> +
> +/*
> + * 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 = "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,
> + .use_clustering = ENABLE_CLUSTERING,
> + .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 "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 "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 "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 "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 "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), "pvscsi_wq_%u", adapter->host->host_no);
> +
> + adapter->workqueue = create_singlethread_workqueue(name);
> + if (!adapter->workqueue) {
> + printk(KERN_ERR "pvscsi: failed to create work queue\n");
> + return 0;
> + }
> + INIT_WORK(&adapter->work, pvscsi_msg_workqueue_handler);
> +
> + return 1;
> +}
> +
> +static irqreturn_t pvscsi_isr(int irq, void *devp)
> +{
> + struct pvscsi_adapter *adapter = devp;
> + int handled;
> +
> + if (adapter->use_msi || adapter->use_msix)
> + handled = true;
> + else {
> + u32 val = pvscsi_read_intr_status(adapter);
> + handled = (val & PVSCSI_INTR_ALL_SUPPORTED) != 0;
> + if (handled)
> + pvscsi_write_intr_status(devp, val);
> + }
> +
> + if (handled) {
> + 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_RETVAL(handled);
> +}
> +
> +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)
> + kfree(ctx->sgl);
> +}
> +
> +static int pvscsi_setup_msix(const struct pvscsi_adapter *adapter, int *irq)
> +{
> + struct msix_entry entry = { 0, PVSCSI_VECTOR_COMPLETION };
> + int ret;
> +
> + ret = pci_enable_msix(adapter->dev, &entry, 1);
> + if (ret)
> + return ret;
> +
> + *irq = entry.vector;
> +
> + return 0;
> +}
> +
> +static void pvscsi_shutdown_intr(struct pvscsi_adapter *adapter)
> +{
> + if (adapter->irq) {
> + free_irq(adapter->irq, adapter);
> + adapter->irq = 0;
> + }
> + if (adapter->use_msi) {
> + pci_disable_msi(adapter->dev);
> + adapter->use_msi = 0;
> + } else if (adapter->use_msix) {
> + pci_disable_msix(adapter->dev);
> + adapter->use_msix = 0;
> + }
> +}
> +
> +static void pvscsi_release_resources(struct pvscsi_adapter *adapter)
> +{
> + pvscsi_shutdown_intr(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)
> + pci_free_consistent(adapter->dev, PAGE_SIZE,
> + adapter->rings_state, adapter->ringStatePA);
> +
> + if (adapter->req_ring)
> + pci_free_consistent(adapter->dev,
> + adapter->req_pages * PAGE_SIZE,
> + adapter->req_ring, adapter->reqRingPA);
> +
> + if (adapter->cmp_ring)
> + pci_free_consistent(adapter->dev,
> + adapter->cmp_pages * PAGE_SIZE,
> + adapter->cmp_ring, adapter->cmpRingPA);
> +
> + if (adapter->msg_ring)
> + pci_free_consistent(adapter->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 deeep 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 __devinit 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 = kmalloc(SGL_SIZE, GFP_KERNEL);
> + ctx->sglPA = 0;
> + BUG_ON(!IS_ALIGNED(((unsigned long)ctx->sgl), PAGE_SIZE));
> + if (!ctx->sgl) {
> + for (; i >= 0; --i, --ctx) {
> + kfree(ctx->sgl);
> + ctx->sgl = NULL;
> + }
> + return -ENOMEM;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static int __devinit pvscsi_probe(struct pci_dev *pdev,
> + const struct pci_device_id *id)
> +{
> + struct pvscsi_adapter *adapter;
> + struct Scsi_Host *host;
> + unsigned int i;
> + int error;
> +
> + error = -ENODEV;
> +
> + if (pci_enable_device(pdev))
> + return error;
> +
> + if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) == 0 &&
> + pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)) == 0) {
> + printk(KERN_INFO "pvscsi: using 64bit dma\n");
> + } else if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) == 0 &&
> + pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)) == 0) {
> + printk(KERN_INFO "pvscsi: using 32bit dma\n");
> + } else {
> + printk(KERN_ERR "pvscsi: failed to set DMA mask\n");
> + goto out_disable_device;
> + }
> +
> + 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 "pvscsi: failed to allocate host\n");
> + goto out_disable_device;
> + }
> +
> + adapter = shost_priv(host);
> + memset(adapter, 0, sizeof(*adapter));
> + adapter->dev = pdev;
> + adapter->host = host;
> +
> + spin_lock_init(&adapter->hw_lock);
> +
> + host->max_channel = 0;
> + host->max_id = 16;
> + host->max_lun = 1;
> + host->max_cmd_len = 16;
> +
> + adapter->rev = pdev->revision;
> +
> + if (pci_request_regions(pdev, "pvscsi")) {
> + printk(KERN_ERR "pvscsi: pci memory selection failed\n");
> + goto out_free_host;
> + }
> +
> + 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 "pvscsi: adapter has no suitable MMIO region\n");
> + goto out_release_resources;
> + }
> +
> + adapter->mmioBase = pci_iomap(pdev, i, PVSCSI_MEM_SPACE_SIZE);
> +
> + if (!adapter->mmioBase) {
> + printk(KERN_ERR "pvscsi: can't iomap for BAR %d memsize %lu\n",
> + i, PVSCSI_MEM_SPACE_SIZE);
> + goto out_release_resources;
> + }
> +
> + pci_set_master(pdev);
> + 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 "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 "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 "pvscsi: unable to allocate s/g table\n");
> + goto out_reset_adapter;
> + }
> +
> + if (!pvscsi_disable_msix &&
> + pvscsi_setup_msix(adapter, &adapter->irq) == 0) {
> + printk(KERN_INFO "pvscsi: using MSI-X\n");
> + adapter->use_msix = 1;
> + } else if (!pvscsi_disable_msi && pci_enable_msi(pdev) == 0) {
> + printk(KERN_INFO "pvscsi: using MSI\n");
> + adapter->use_msi = 1;
> + adapter->irq = pdev->irq;
> + } else {
> + printk(KERN_INFO "pvscsi: using INTx\n");
> + adapter->irq = pdev->irq;
> + }
> +
> + error = request_irq(adapter->irq, pvscsi_isr, IRQF_SHARED,
> + "pvscsi", adapter);
> + if (error) {
> + printk(KERN_ERR "pvscsi: unable to request IRQ: %d\n", error);
> + adapter->irq = 0;
> + goto out_reset_adapter;
> + }
> +
> + error = scsi_add_host(host, &pdev->dev);
> + if (error) {
> + printk(KERN_ERR "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_release_resources(adapter);
> +out_free_host:
> + scsi_host_put(host);
> +out_disable_device:
> + pci_set_drvdata(pdev, NULL);
> + pci_disable_device(pdev);
> +
> + return error;
> +}
> +
> +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_set_drvdata(pdev, NULL);
> + pci_disable_device(pdev);
> +}
> +
> +static struct pci_driver pvscsi_pci_driver = {
> + .name = "pvscsi",
> + .id_table = pvscsi_pci_tbl,
> + .probe = pvscsi_probe,
> + .remove = __devexit_p(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);
> diff --git a/drivers/scsi/pvscsi.h b/drivers/scsi/pvscsi.h
> new file mode 100644
> index 0000000..9753eee
> --- /dev/null
> +++ b/drivers/scsi/pvscsi.h
> @@ -0,0 +1,397 @@
> +/*
> + * VMware PVSCSI header file
> + *
> + * Copyright (C) 2008-2009, VMware, Inc. All Rights Reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; version 2 of the License and no later version.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
> + * NON INFRINGEMENT. See the GNU General Public License for more
> + * details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
> + *
> + * Maintained by: Alok N Kataria <akataria@...are.com>
> + *
> + */
> +
> +#ifndef _PVSCSI_H_
> +#define _PVSCSI_H_
> +
> +#include <linux/types.h>
> +
> +#define PVSCSI_DRIVER_VERSION_STRING "1.0.1.0-k"
> +
> +#define PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT 128
> +
> +#define MASK(n) ((1 << (n)) - 1) /* make an n-bit mask */
> +
> +#define PCI_VENDOR_ID_VMWARE 0x15AD
> +#define PCI_DEVICE_ID_VMWARE_PVSCSI 0x07C0
> +
> +/*
> + * host adapter status/error codes
> + */
> +enum HostBusAdapterStatus {
> + BTSTAT_SUCCESS = 0x00, /* CCB complete normally with no errors */
> + BTSTAT_LINKED_COMMAND_COMPLETED = 0x0a,
> + BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG = 0x0b,
> + BTSTAT_DATA_UNDERRUN = 0x0c,
> + BTSTAT_SELTIMEO = 0x11, /* SCSI selection timeout */
> + BTSTAT_DATARUN = 0x12, /* data overrun/underrun */
> + BTSTAT_BUSFREE = 0x13, /* unexpected bus free */
> + BTSTAT_INVPHASE = 0x14, /* invalid bus phase or sequence requested by target */
> + BTSTAT_LUNMISMATCH = 0x17, /* linked CCB has different LUN from first CCB */
> + BTSTAT_SENSFAILED = 0x1b, /* auto request sense failed */
> + BTSTAT_TAGREJECT = 0x1c, /* SCSI II tagged queueing message rejected by target */
> + BTSTAT_BADMSG = 0x1d, /* unsupported message received by the host adapter */
> + BTSTAT_HAHARDWARE = 0x20, /* host adapter hardware failed */
> + BTSTAT_NORESPONSE = 0x21, /* target did not respond to SCSI ATN, sent a SCSI RST */
> + BTSTAT_SENTRST = 0x22, /* host adapter asserted a SCSI RST */
> + BTSTAT_RECVRST = 0x23, /* other SCSI devices asserted a SCSI RST */
> + BTSTAT_DISCONNECT = 0x24, /* target device reconnected improperly (w/o tag) */
> + BTSTAT_BUSRESET = 0x25, /* host adapter issued BUS device reset */
> + BTSTAT_ABORTQUEUE = 0x26, /* abort queue generated */
> + BTSTAT_HASOFTWARE = 0x27, /* host adapter software error */
> + BTSTAT_HATIMEOUT = 0x30, /* host adapter hardware timeout error */
> + BTSTAT_SCSIPARITY = 0x34, /* SCSI parity error detected */
> +};
> +
> +/*
> + * Register offsets.
> + *
> + * These registers are accessible both via i/o space and mm i/o.
> + */
> +
> +enum PVSCSIRegOffset {
> + PVSCSI_REG_OFFSET_COMMAND = 0x0,
> + PVSCSI_REG_OFFSET_COMMAND_DATA = 0x4,
> + PVSCSI_REG_OFFSET_COMMAND_STATUS = 0x8,
> + PVSCSI_REG_OFFSET_LAST_STS_0 = 0x100,
> + PVSCSI_REG_OFFSET_LAST_STS_1 = 0x104,
> + PVSCSI_REG_OFFSET_LAST_STS_2 = 0x108,
> + PVSCSI_REG_OFFSET_LAST_STS_3 = 0x10c,
> + PVSCSI_REG_OFFSET_INTR_STATUS = 0x100c,
> + PVSCSI_REG_OFFSET_INTR_MASK = 0x2010,
> + PVSCSI_REG_OFFSET_KICK_NON_RW_IO = 0x3014,
> + PVSCSI_REG_OFFSET_DEBUG = 0x3018,
> + PVSCSI_REG_OFFSET_KICK_RW_IO = 0x4018,
> +};
> +
> +/*
> + * Virtual h/w commands.
> + */
> +
> +enum PVSCSICommands {
> + PVSCSI_CMD_FIRST = 0, /* has to be first */
> +
> + PVSCSI_CMD_ADAPTER_RESET = 1,
> + PVSCSI_CMD_ISSUE_SCSI = 2,
> + PVSCSI_CMD_SETUP_RINGS = 3,
> + PVSCSI_CMD_RESET_BUS = 4,
> + PVSCSI_CMD_RESET_DEVICE = 5,
> + PVSCSI_CMD_ABORT_CMD = 6,
> + PVSCSI_CMD_CONFIG = 7,
> + PVSCSI_CMD_SETUP_MSG_RING = 8,
> + PVSCSI_CMD_DEVICE_UNPLUG = 9,
> +
> + PVSCSI_CMD_LAST = 10 /* has to be last */
> +};
> +
> +/*
> + * Command descriptor for PVSCSI_CMD_RESET_DEVICE --
> + */
> +
> +struct PVSCSICmdDescResetDevice {
> + u32 target;
> + u8 lun[8];
> +} __packed;
> +
> +/*
> + * Command descriptor for PVSCSI_CMD_ABORT_CMD --
> + *
> + * - currently does not support specifying the LUN.
> + * - _pad should be 0.
> + */
> +
> +struct PVSCSICmdDescAbortCmd {
> + u64 context;
> + u32 target;
> + u32 _pad;
> +} __packed;
> +
> +/*
> + * Command descriptor for PVSCSI_CMD_SETUP_RINGS --
> + *
> + * Notes:
> + * - reqRingNumPages and cmpRingNumPages need to be power of two.
> + * - reqRingNumPages and cmpRingNumPages need to be different from 0,
> + * - reqRingNumPages and cmpRingNumPages need to be inferior to
> + * PVSCSI_SETUP_RINGS_MAX_NUM_PAGES.
> + */
> +
> +#define PVSCSI_SETUP_RINGS_MAX_NUM_PAGES 32
> +struct PVSCSICmdDescSetupRings {
> + u32 reqRingNumPages;
> + u32 cmpRingNumPages;
> + u64 ringsStatePPN;
> + u64 reqRingPPNs[PVSCSI_SETUP_RINGS_MAX_NUM_PAGES];
> + u64 cmpRingPPNs[PVSCSI_SETUP_RINGS_MAX_NUM_PAGES];
> +} __packed;
> +
> +/*
> + * Command descriptor for PVSCSI_CMD_SETUP_MSG_RING --
> + *
> + * Notes:
> + * - this command was not supported in the initial revision of the h/w
> + * interface. Before using it, you need to check that it is supported by
> + * writing PVSCSI_CMD_SETUP_MSG_RING to the 'command' register, then
> + * immediately after read the 'command status' register:
> + * * a value of -1 means that the cmd is NOT supported,
> + * * a value != -1 means that the cmd IS supported.
> + * If it's supported the 'command status' register should return:
> + * sizeof(PVSCSICmdDescSetupMsgRing) / sizeof(u32).
> + * - this command should be issued _after_ the usual SETUP_RINGS so that the
> + * RingsState page is already setup. If not, the command is a nop.
> + * - numPages needs to be a power of two,
> + * - numPages needs to be different from 0,
> + * - _pad should be zero.
> + */
> +
> +#define PVSCSI_SETUP_MSG_RING_MAX_NUM_PAGES 16
> +
> +struct PVSCSICmdDescSetupMsgRing {
> + u32 numPages;
> + u32 _pad;
> + u64 ringPPNs[PVSCSI_SETUP_MSG_RING_MAX_NUM_PAGES];
> +} __packed;
> +
> +enum PVSCSIMsgType {
> + PVSCSI_MSG_DEV_ADDED = 0,
> + PVSCSI_MSG_DEV_REMOVED = 1,
> + PVSCSI_MSG_LAST = 2,
> +};
> +
> +/*
> + * Msg descriptor.
> + *
> + * sizeof(struct PVSCSIRingMsgDesc) == 128.
> + *
> + * - type is of type enum PVSCSIMsgType.
> + * - the content of args depend on the type of event being delivered.
> + */
> +
> +struct PVSCSIRingMsgDesc {
> + u32 type;
> + u32 args[31];
> +} __packed;
> +
> +struct PVSCSIMsgDescDevStatusChanged {
> + u32 type; /* PVSCSI_MSG_DEV _ADDED / _REMOVED */
> + u32 bus;
> + u32 target;
> + u8 lun[8];
> + u32 pad[27];
> +} __packed;
> +
> +/*
> + * Rings state.
> + *
> + * - the fields:
> + * . msgProdIdx,
> + * . msgConsIdx,
> + * . msgNumEntriesLog2,
> + * .. are only used once the SETUP_MSG_RING cmd has been issued.
> + * - '_pad' helps to ensure that the msg related fields are on their own
> + * cache-line.
> + */
> +
> +struct PVSCSIRingsState {
> + u32 reqProdIdx;
> + u32 reqConsIdx;
> + u32 reqNumEntriesLog2;
> +
> + u32 cmpProdIdx;
> + u32 cmpConsIdx;
> + u32 cmpNumEntriesLog2;
> +
> + u8 _pad[104];
> +
> + u32 msgProdIdx;
> + u32 msgConsIdx;
> + u32 msgNumEntriesLog2;
> +} __packed;
> +
> +/*
> + * Request descriptor.
> + *
> + * sizeof(RingReqDesc) = 128
> + *
> + * - context: is a unique identifier of a command. It could normally be any
> + * 64bit value, however we currently store it in the serialNumber variable
> + * of struct SCSI_Command, so we have the following restrictions due to the
> + * way this field is handled in the vmkernel storage stack:
> + * * this value can't be 0,
> + * * the upper 32bit need to be 0 since serialNumber is as a u32.
> + * Currently tracked as PR 292060.
> + * - dataLen: contains the total number of bytes that need to be transferred.
> + * - dataAddr:
> + * * if PVSCSI_FLAG_CMD_WITH_SG_LIST is set: dataAddr is the PA of the first
> + * s/g table segment, each s/g segment is entirely contained on a single
> + * page of physical memory,
> + * * if PVSCSI_FLAG_CMD_WITH_SG_LIST is NOT set, then dataAddr is the PA of
> + * the buffer used for the DMA transfer,
> + * - flags:
> + * * PVSCSI_FLAG_CMD_WITH_SG_LIST: see dataAddr above,
> + * * PVSCSI_FLAG_CMD_DIR_NONE: no DMA involved,
> + * * PVSCSI_FLAG_CMD_DIR_TOHOST: transfer from device to main memory,
> + * * PVSCSI_FLAG_CMD_DIR_TODEVICE: transfer from main memory to device,
> + * * PVSCSI_FLAG_CMD_OUT_OF_BAND_CDB: reserved to handle CDBs larger than
> + * 16bytes. To be specified.
> + * - vcpuHint: vcpuId of the processor that will be most likely waiting for the
> + * completion of the i/o. For guest OSes that use lowest priority message
> + * delivery mode (such as windows), we use this "hint" to deliver the
> + * completion action to the proper vcpu. For now, we can use the vcpuId of
> + * the processor that initiated the i/o as a likely candidate for the vcpu
> + * that will be waiting for the completion..
> + * - bus should be 0: we currently only support bus 0 for now.
> + * - unused should be zero'd.
> + */
> +
> +#define PVSCSI_FLAG_CMD_WITH_SG_LIST (1 << 0)
> +#define PVSCSI_FLAG_CMD_OUT_OF_BAND_CDB (1 << 1)
> +#define PVSCSI_FLAG_CMD_DIR_NONE (1 << 2)
> +#define PVSCSI_FLAG_CMD_DIR_TOHOST (1 << 3)
> +#define PVSCSI_FLAG_CMD_DIR_TODEVICE (1 << 4)
> +
> +struct PVSCSIRingReqDesc {
> + u64 context;
> + u64 dataAddr;
> + u64 dataLen;
> + u64 senseAddr;
> + u32 senseLen;
> + u32 flags;
> + u8 cdb[16];
> + u8 cdbLen;
> + u8 lun[8];
> + u8 tag;
> + u8 bus;
> + u8 target;
> + u8 vcpuHint;
> + u8 unused[59];
> +} __packed;
> +
> +/*
> + * Scatter-gather list management.
> + *
> + * As described above, when PVSCSI_FLAG_CMD_WITH_SG_LIST is set in the
> + * RingReqDesc.flags, then RingReqDesc.dataAddr is the PA of the first s/g
> + * table segment.
> + *
> + * - each segment of the s/g table contain a succession of struct
> + * PVSCSISGElement.
> + * - each segment is entirely contained on a single physical page of memory.
> + * - a "chain" s/g element has the flag PVSCSI_SGE_FLAG_CHAIN_ELEMENT set in
> + * PVSCSISGElement.flags and in this case:
> + * * addr is the PA of the next s/g segment,
> + * * length is undefined, assumed to be 0.
> + */
> +
> +struct PVSCSISGElement {
> + u64 addr;
> + u32 length;
> + u32 flags;
> +} __packed;
> +
> +/*
> + * Completion descriptor.
> + *
> + * sizeof(RingCmpDesc) = 32
> + *
> + * - context: identifier of the command. The same thing that was specified
> + * under "context" as part of struct RingReqDesc at initiation time,
> + * - dataLen: number of bytes transferred for the actual i/o operation,
> + * - senseLen: number of bytes written into the sense buffer,
> + * - hostStatus: adapter status,
> + * - scsiStatus: device status,
> + * - _pad should be zero.
> + */
> +
> +struct PVSCSIRingCmpDesc {
> + u64 context;
> + u64 dataLen;
> + u32 senseLen;
> + u16 hostStatus;
> + u16 scsiStatus;
> + u32 _pad[2];
> +} __packed;
> +
> +/*
> + * Interrupt status / IRQ bits.
> + */
> +
> +#define PVSCSI_INTR_CMPL_0 (1 << 0)
> +#define PVSCSI_INTR_CMPL_1 (1 << 1)
> +#define PVSCSI_INTR_CMPL_MASK MASK(2)
> +
> +#define PVSCSI_INTR_MSG_0 (1 << 2)
> +#define PVSCSI_INTR_MSG_1 (1 << 3)
> +#define PVSCSI_INTR_MSG_MASK (MASK(2) << 2)
> +
> +#define PVSCSI_INTR_ALL_SUPPORTED MASK(4)
> +
> +/*
> + * Number of MSI-X vectors supported.
> + */
> +#define PVSCSI_MAX_INTRS 24
> +
> +/*
> + * Enumeration of supported MSI-X vectors
> + */
> +#define PVSCSI_VECTOR_COMPLETION 0
> +
> +/*
> + * Misc constants for the rings.
> + */
> +
> +#define PVSCSI_MAX_NUM_PAGES_REQ_RING PVSCSI_SETUP_RINGS_MAX_NUM_PAGES
> +#define PVSCSI_MAX_NUM_PAGES_CMP_RING PVSCSI_SETUP_RINGS_MAX_NUM_PAGES
> +#define PVSCSI_MAX_NUM_PAGES_MSG_RING PVSCSI_SETUP_MSG_RING_MAX_NUM_PAGES
> +
> +#define PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE \
> + (PAGE_SIZE / sizeof(struct PVSCSIRingReqDesc))
> +
> +#define PVSCSI_MAX_REQ_QUEUE_DEPTH \
> + (PVSCSI_MAX_NUM_PAGES_REQ_RING * PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE)
> +
> +#define PVSCSI_MEM_SPACE_COMMAND_NUM_PAGES 1
> +#define PVSCSI_MEM_SPACE_INTR_STATUS_NUM_PAGES 1
> +#define PVSCSI_MEM_SPACE_MISC_NUM_PAGES 2
> +#define PVSCSI_MEM_SPACE_KICK_IO_NUM_PAGES 2
> +#define PVSCSI_MEM_SPACE_MSIX_NUM_PAGES 2
> +
> +enum PVSCSIMemSpace {
> + PVSCSI_MEM_SPACE_COMMAND_PAGE = 0,
> + PVSCSI_MEM_SPACE_INTR_STATUS_PAGE = 1,
> + PVSCSI_MEM_SPACE_MISC_PAGE = 2,
> + PVSCSI_MEM_SPACE_KICK_IO_PAGE = 4,
> + PVSCSI_MEM_SPACE_MSIX_TABLE_PAGE = 6,
> + PVSCSI_MEM_SPACE_MSIX_PBA_PAGE = 7,
> +};
> +
> +#define PVSCSI_MEM_SPACE_NUM_PAGES \
> + (PVSCSI_MEM_SPACE_COMMAND_NUM_PAGES + \
> + PVSCSI_MEM_SPACE_INTR_STATUS_NUM_PAGES + \
> + PVSCSI_MEM_SPACE_MISC_NUM_PAGES + \
> + PVSCSI_MEM_SPACE_KICK_IO_NUM_PAGES + \
> + PVSCSI_MEM_SPACE_MSIX_NUM_PAGES)
> +
> +#define PVSCSI_MEM_SPACE_SIZE (PVSCSI_MEM_SPACE_NUM_PAGES * PAGE_SIZE)
> +
> +#endif /* _PVSCSI_H_ */
>
--
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