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    SubjectSCSI driver for VMware's virtual HBA - V5.
    From
    Date
    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@vmware.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@vmware.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@vmware.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@vmware.com>
    +M: VMware PV-Drivers <pv-drivers@vmware.com>
    +L: linux-scsi@vger.kernel.org
    +S: Maintained
    +F: drivers/scsi/pvscsi.c
    +F: drivers/scsi/pvscsi.h
    +
    VOLTAGE AND CURRENT REGULATOR FRAMEWORK
    M: Liam Girdwood <lrg@slimlogic.co.uk>
    M: Mark Brown <broonie@opensource.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@vmware.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@vmware.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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