svn commit: r300396 - projects/vmware_pvscsi/sys/dev/vmware/vmw_pvscsi
Garrett Cooper
ngie at FreeBSD.org
Sun May 22 04:28:56 UTC 2016
Author: ngie
Date: Sun May 22 04:28:55 2016
New Revision: 300396
URL: https://svnweb.freebsd.org/changeset/base/300396
Log:
Commit the 1.0.1.0-k driver obtained from VMware under a BSD 2-clause license
Obtained from: Isilon OneFS
Sponsored by: EMC / Isilon Storage Division
Added:
projects/vmware_pvscsi/sys/dev/vmware/vmw_pvscsi/
projects/vmware_pvscsi/sys/dev/vmware/vmw_pvscsi/vmw_pvscsi.c (contents, props changed)
projects/vmware_pvscsi/sys/dev/vmware/vmw_pvscsi/vmw_pvscsi.h (contents, props changed)
Added: projects/vmware_pvscsi/sys/dev/vmware/vmw_pvscsi/vmw_pvscsi.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ projects/vmware_pvscsi/sys/dev/vmware/vmw_pvscsi/vmw_pvscsi.c Sun May 22 04:28:55 2016 (r300396)
@@ -0,0 +1,2745 @@
+/*
+ * Copyright (c) 2014 EMC Corporation, Inc. All rights reserved.
+ */
+
+/* ************************************************************************
+ * Copyright 2008 VMware, Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ************************************************************************/
+
+/*
+ * pvscsi.c --
+ *
+ * This is a driver for the VMware PVSCSI HBA adapter.
+ */
+
+#ifndef __FreeBSD__
+#include "driver-config.h"
+
+#include <linux/kernel.h>
+#include <linux/module.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 "compat_module.h"
+#include "compat_scsi.h"
+#include "compat_pci.h"
+#include "compat_interrupt.h"
+#include "compat_workqueue.h"
+
+#include "pvscsi_defs.h"
+#include "pvscsi_version.h"
+#include "scsi_defs.h"
+#include "vm_device_version.h"
+#include "vm_assert.h"
+
+#define PVSCSI_LINUX_DRIVER_DESC "VMware PVSCSI driver"
+
+MODULE_DESCRIPTION(PVSCSI_LINUX_DRIVER_DESC);
+MODULE_AUTHOR("VMware, Inc.");
+MODULE_LICENSE("GPL v2");
+MODULE_VERSION(PVSCSI_DRIVER_VERSION_STRING);
+
+/*
+ * Starting with SLE10sp2, Novell requires that IHVs sign a support agreement
+ * with them and mark their kernel modules as externally supported via a
+ * change to the module header. If this isn't done, the module will not load
+ * by default (i.e., neither mkinitrd nor modprobe will accept it).
+ */
+MODULE_INFO(supported, "external");
+#else
+#include "vmw_pvscsi.h"
+#endif /* __FreeBSD__ */
+
+#define PVSCSI_DEFAULT_NUM_PAGES_PER_RING 8
+#define PVSCSI_DEFAULT_NUM_PAGES_MSG_RING 1
+#define PVSCSI_DEFAULT_QUEUE_DEPTH 64
+
+#ifndef __FreeBSD__
+/* MSI-X has horrible performance in < 2.6.19 due to needless mask frobbing */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19)
+#define PVSCSI_DISABLE_MSIX 0
+#else
+#define PVSCSI_DISABLE_MSIX 1
+#endif
+#endif /* __FreeBSD__ */
+
+
+#ifndef __FreeBSD__
+#define HOST_ADAPTER(host) ((struct pvscsi_adapter *)(host)->hostdata)
+
+#define LOG(level, fmt, args...) \
+do { \
+ if (pvscsi_debug_level > level) \
+ printk(KERN_DEBUG "pvscsi: " fmt, args); \
+} while (0)
+#endif /* __FreeBSD__ */
+
+
+#ifdef __FreeBSD__
+typedef struct pvscsi_adapter pvscsinst_t;
+
+#define MODNM pvscsi
+enum {
+ PVSCSI_MSIX_VEC0 = 0, /* Only one MSI-X interrupt required */
+ PVSCSI_NUM_MSIX
+};
+
+MALLOC_DEFINE(M_PVSCSI, "pvscsi", "VMware's para-virtualized scsi driver");
+MALLOC_DEFINE(M_PVSCSI_PCI, "pvscsi_pci", "pvscsi's ring queues");
+MALLOC_DEFINE(M_PVSCSI_SGL, "pvscsi_sgl", "pvscsi's scatter-gather list");
+#endif /* __FreeBSD__ */
+
+
+
+/* Command line parameters */
+#ifndef __FreeBSD__
+static int pvscsi_debug_level;
+#endif /* __FreeBSD__ */
+static int pvscsi_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_PER_RING;
+static int pvscsi_msg_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_MSG_RING;
+#ifndef __FreeBSD__
+static int pvscsi_cmd_per_lun = PVSCSI_DEFAULT_QUEUE_DEPTH;
+static compat_mod_param_bool pvscsi_disable_msi;
+static compat_mod_param_bool pvscsi_disable_msix = PVSCSI_DISABLE_MSIX;
+static compat_mod_param_bool pvscsi_use_msg = TRUE;
+#else
+static bool pvscsi_use_msg = true;
+#endif /* __FreeBSD__ */
+
+#ifndef __FreeBSD__
+#define PVSCSI_RW (S_IRUSR | S_IWUSR)
+
+module_param_named(debug_level, pvscsi_debug_level, int, PVSCSI_RW);
+MODULE_PARM_DESC(debug_level, "Debug logging level - (default=0)");
+
+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="
+ __stringify(PVSCSI_DISABLE_MSIX) ")");
+
+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_DEVICE(PCI_VENDOR_ID_VMWARE, PCI_DEVICE_ID_VMWARE_PVSCSI) },
+ { 0 }
+};
+
+MODULE_DEVICE_TABLE(pci, pvscsi_pci_tbl);
+#else
+#define pvscsi_dev(adapter) ((adapter)->pvs_dev)
+#define pvscsi_simdev(sim) (pvscsi_dev((pvscsinst_t *)cam_sim_softc(sim)))
+
+/*
+ * To share code between the Linux and Isilon ports we key off the variable
+ * "irq" to figure out if we need to actually lock or not
+ */
+#define spin_lock_irqsave(l,f) if (irq) PVSCSILCK
+#define spin_unlock_irqrestore(l,f) if (irq) PVSCSIULCK
+
+#define SCSI_SENSE_BUFFERSIZE sizeof(csio->sense_data)
+#define SIMPLE_QUEUE_TAG MSG_SIMPLE_Q_TAG
+#define HEAD_OF_QUEUE_TAG MSG_HEAD_OF_Q_TAG
+#define ORDERED_QUEUE_TAG MSG_ORDERED_Q_TAG
+
+enum dma_data_direction {
+ DMA_BIDIRECTIONAL = 0,
+ DMA_TO_DEVICE = 1,
+ DMA_FROM_DEVICE = 2,
+ DMA_NONE = 3,
+};
+
+struct scsi_cmnd {
+ struct ccb_scsiio *qsc_csio;
+ void *sense_buffer;
+ unsigned short cmd_len;
+ unsigned char *cmn;
+ struct scsi_device *device;
+ enum dma_data_direction sc_data_direction;
+ unsigned char tag;
+ unsigned char *cmnd;
+ pvscsinst_t *adapter;
+};
+
+struct scsi_device {
+ unsigned int id, lun, channel;
+ bool tagged_supported;
+};
+#endif /* __FreeBSD__ */
+
+static struct pvscsi_ctx *
+#ifndef __FreeBSD__
+pvscsi_find_context(const struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd)
+#else /* __FreeBSD__ */
+pvscsi_find_context(struct pvscsi_adapter *adapter, struct ccb_scsiio *cmd)
+#endif /* __FreeBSD__ */
+{
+ 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_entry(adapter->cmd_pool.next, struct pvscsi_ctx, list);
+#ifndef __FreeBSD__
+ ctx->cmd = cmd;
+#else
+ ctx->cmd = cmd->qsc_csio;
+ ctx->toed = false;
+ ctx->debugerr_checked = false;
+#endif /* __FreeBSD__ */
+ 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.
+ */
+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];
+}
+
+/**************************************************************
+ *
+ * VMWARE PVSCSI Hypervisor Communication Implementation
+ *
+ * This code is largely independent of any Linux internals.
+ *
+ **************************************************************/
+
+static void pvscsi_reg_write(const struct pvscsi_adapter *adapter,
+ u32 offset, u32 val)
+{
+#ifndef __FreeBSD__
+ writel(val, adapter->mmioBase + offset);
+#else /* __FreeBSD__ */
+ bus_space_write_4(adapter->pvs_mmtag, adapter->pvs_mmhndl, offset, val);
+#endif /* __FreeBSD__ */
+}
+
+static u32 pvscsi_reg_read(const struct pvscsi_adapter *adapter, u32 offset)
+{
+#ifndef __FreeBSD__
+ return readl(adapter->mmioBase + offset);
+#else /* __FreeBSD__ */
+ return bus_space_read_4(adapter->pvs_mmtag, adapter->pvs_mmhndl, offset);
+#endif /* __FreeBSD__ */
+}
+
+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)
+{
+#ifndef __FreeBSD__
+ u32 *ptr = (u32 *)desc;
+#else /* __FreeBSD__ */
+ const u32 *ptr = (const u32 *)desc;
+#endif /* __FreeBSD__ */
+ unsigned i;
+
+ len /= sizeof(u32);
+ 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]);
+}
+
+#ifndef __FreeBSD__
+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;
+#else /* __FreeBSD__ */
+static void pvscsi_abort_cmd(struct pvscsi_adapter *adapter,
+ struct pvscsi_ctx *ctx,
+ target_id_t trg)
+{
+ struct PVSCSICmdDescAbortCmd cmd = { 0 };
+ cmd.target = trg;
+#endif /* __FreeBSD__ */
+ 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)
+{
+ LOG(0, "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)
+{
+ LOG(0, "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 };
+
+ LOG(0, "Reseting device: target=%u\n", target);
+
+#ifdef __FreeBSD__
+ device_t device = pvscsi_dev(adapter);
+ device_printf(device, "Resetting target %u\n", target);
+#endif /* _FreeBSD__ */
+ cmd.target = target;
+
+ pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_DEVICE,
+ &cmd, sizeof cmd);
+#ifdef __FreeBSD__
+ device_printf(device, "Done resetting target %u\n", target);
+#endif /* _FreeBSD__ */
+}
+
+
+#ifndef __FreeBSD__
+/**************************************************************
+ *
+ * VMWARE Hypervisor ring / SCSI mid-layer interactions
+ *
+ * Functions which have to deal with both ring semantics
+ * and Linux SCSI internals are placed here.
+ *
+ **************************************************************/
+
+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;
+ }
+}
+#endif /* __FreeBSD__ */
+
+#ifdef __FreeBSD__
+/*
+ * Takes a list of physical segments and translates them into the VMware
+ * device emulation's scatter/gather format. It does not initiate the I/O.
+ * It reports any errors in the translation through the ctx structure.
+ *
+ * The bus_dma_segment_t pointed to by dm_segs is allocated on the stack.
+ */
+static void
+pvscsi_queue_io(void *arg, bus_dma_segment_t *dm_segs, int nseg, int error)
+{
+ struct pvscsi_ctx *ctx = (struct pvscsi_ctx *)arg;
+
+ if (error || ctx->dmamapping_errno) {
+ ctx->dmamapping_errno = error;
+ return;
+ }
+
+ if (nseg > PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT) {
+ ctx->dmamapping_errno = EFBIG;
+ return;
+ }
+
+ unsigned i;
+ struct PVSCSISGElement *sge = &ctx->sgl->sge[0];
+
+ struct PVSCSIRingReqDesc *e = ctx->e;
+ e->flags |= PVSCSI_FLAG_CMD_WITH_SG_LIST;
+
+ for (i = 0; i < nseg; i++) {
+ sge[i].addr = dm_segs[i].ds_addr;
+ sge[i].length = dm_segs[i].ds_len;
+ sge[i].flags = 0;
+ }
+
+ ctx->dmamapping_errno = 0;
+ e->flags |= PVSCSI_FLAG_CMD_WITH_SG_LIST;
+ ctx->sglPA = pci_map_single(adapter->dev, ctx->sgl,
+ PAGE_SIZE, PCI_DMA_TODEVICE);
+ e->dataAddr = ctx->sglPA;
+}
+#define scsi_bufflen(cmd) (cmd)->qsc_csio->dxfer_len
+#define pvscsi_create_sg(a,b,c)
+#define scsi_sg_count(a) 2
+#define scsi_dma_map(a) 2
+
+static inline dma_addr_t
+sg_dma_address_fn(void)
+{
+ panic("This code-path shouldn't have been taken");
+ return 0;
+}
+#define sg_dma_address(sg) sg_dma_address_fn()
+#define IRQ_RETVAL(a) 0
+
+#define SAM_STAT_GOOD SCSI_STATUS_OK
+#define SAM_STAT_CHECK_CONDITION SCSI_STATUS_CHECK_COND
+#define SAM_STAT_COMMAND_TERMINATED SCSI_STATUS_CMD_TERMINATED
+#endif /* __FreeBSD__ */
+/*
+ * 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);
+
+ e->dataLen = bufflen;
+ e->dataAddr = 0;
+ if (bufflen == 0)
+ return;
+
+#ifdef __FreeBSD__
+ struct ccb_scsiio *csio = cmd->qsc_csio;
+ device_t device = pvscsi_dev(adapter);
+
+ ctx->e = e;
+ ctx->dmamapping_errno = 0;
+
+ switch(csio->ccb_h.flags & (CAM_DATA_PHYS|CAM_SCATTER_VALID)) {
+ case CAM_DATA_PHYS|CAM_SCATTER_VALID: {
+ pvscsi_queue_io(ctx,
+ (struct bus_dma_segment *)csio->data_ptr,
+ csio->sglist_cnt, 0);
+ LOG(0, "CAM_DATA_PHYS|CAM_SCATTER_VALID\n");
+ break;
+ }
+
+ case CAM_SCATTER_VALID: {
+ device_printf(device, "No support yet for list of VAs\n");
+ csio->ccb_h.status = CAM_REQ_CMP_ERR;
+ LOG(0, "CAM_SCATTER_VALID\n");
+ break;
+ }
+
+ case CAM_DATA_PHYS: {
+ struct bus_dma_segment seg;
+ seg.ds_addr = (bus_addr_t)(vm_offset_t)csio->data_ptr;
+ seg.ds_len = csio->dxfer_len;
+ pvscsi_queue_io(ctx, &seg, 1, 0);
+ LOG(0, "CAM_DATA_PHYS\n");
+ break;
+ }
+
+ case 0: {
+ int error;
+
+ if (csio->bio && !csio->data_ptr)
+ error = bus_dmamap_load_bio(adapter->pvs_dmat,
+ ctx->dmap, csio->bio,
+ pvscsi_queue_io, ctx,
+ BUS_DMA_NOWAIT);
+ else
+ error = bus_dmamap_load(adapter->pvs_dmat,
+ ctx->dmap, csio->data_ptr,
+ csio->dxfer_len,
+ pvscsi_queue_io, ctx,
+ BUS_DMA_NOWAIT);
+ if (error)
+ ctx->dmamapping_errno = error;
+
+ LOG(0, "single VA %p %p %lx\n", csio->bio,
+ csio->data_ptr, virt_to_phys(csio->data_ptr));
+ break;
+ }
+
+ default: {
+ panic("Unknown case %d",
+ (csio->ccb_h.flags &
+ (CAM_DATA_PHYS|CAM_SCATTER_VALID)));
+ }
+ }
+
+ if (ctx->dmamapping_errno) {
+ if (ctx->dmamapping_errno == EFBIG)
+ csio->ccb_h.flags = CAM_REQ_TOO_BIG;
+ else
+ csio->ccb_h.flags = CAM_REQ_CMP_ERR;
+ }
+
+ /*
+ * Setup 'count' and 'segs' so that we choose the path that sets
+ * PVSCSI_FLAG_CMD_WITH_SG_LIST and uses a scatter/gather list
+ */
+#endif /* __FreeBSD__ */
+ count = scsi_sg_count(cmd);
+ if (count != 0) {
+#ifndef __FreeBSD__
+ struct scatterlist *sg = scsi_sglist(cmd);
+ int segs = pci_map_sg(adapter->dev, sg, count,
+ cmd->sc_data_direction);
+#else
+ int segs = 2; /* Force the more generic path below */
+#endif /* __FreeBSD__ */
+ 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,
+ PAGE_SIZE, PCI_DMA_TODEVICE);
+ e->dataAddr = ctx->sglPA;
+ } else
+ e->dataAddr = sg_dma_address(sg);
+ } else {
+#ifndef __FreeBSD__
+ ctx->dataPA = pci_map_single(adapter->dev,
+ scsi_request_buffer(cmd), bufflen,
+ cmd->sc_data_direction);
+#endif /* __FreeBSD__ */
+ e->dataAddr = ctx->dataPA;
+ }
+}
+
+static void pvscsi_unmap_buffers(const struct pvscsi_adapter *adapter,
+ struct pvscsi_ctx *ctx)
+{
+#ifndef __FreeBSD__
+ 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) {
+ pci_unmap_sg(adapter->dev, scsi_sglist(cmd), count,
+ cmd->sc_data_direction);
+ if (ctx->sglPA) {
+ pci_unmap_single(adapter->dev, ctx->sglPA,
+ PAGE_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);
+#else /* __FreeBSD__ */
+ struct ccb_scsiio *csio = ctx->cmd;
+
+ if (csio->dxfer_len &&
+ !(csio->ccb_h.flags & (CAM_DATA_PHYS|CAM_SCATTER_VALID))) {
+ bus_dmamap_unload(adapter->pvs_dmat, ctx->dmap);
+ }
+#endif /* __FreeBSD__ */
+}
+
+static int 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;
+
+#ifndef __FreeBSD__
+ BUG_ON(adapter->ringStatePA & ~PAGE_MASK);
+ BUG_ON(adapter->reqRingPA & ~PAGE_MASK);
+ BUG_ON(adapter->cmpRingPA & ~PAGE_MASK);
+#else
+ BUG_ON(adapter->ringStatePA & PAGE_MASK);
+ BUG_ON(adapter->reqRingPA & PAGE_MASK);
+ BUG_ON(adapter->cmpRingPA & PAGE_MASK);
+#endif /* __FreeBSD__ */
+
+ 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;
+#ifndef __FreeBSD__
+ BUG_ON(adapter->msgRingPA & ~PAGE_MASK);
+#else
+ BUG_ON(adapter->msgRingPA & PAGE_MASK);
+#endif /* __FreeBSD__ */
+
+ 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.
+ */
+void pvscsi_complete_request(struct pvscsi_adapter *adapter,
+ const struct PVSCSIRingCmpDesc *e)
+{
+ struct pvscsi_ctx *ctx;
+#ifndef __FreeBSD__
+ struct scsi_cmnd *cmd;
+#else /* __FreeBSD__ */
+ bool toed = false;
+ struct ccb_scsiio *cmd;
+ device_t device = pvscsi_dev(adapter);
+ int debugerr = 0;
+#endif /* __FreeBSD__ */
+ u32 btstat = e->hostStatus;
+ u32 sdstat = e->scsiStatus;
+
+ ctx = pvscsi_get_context(adapter, e->context);
+ cmd = ctx->cmd;
+#ifdef __FreeBSD__
+
+ /*
+ * check debugerr failpoints now so that we can do nothing if we're
+ * delaying the completion with a timer. Only check them once per
+ * command.
+ */
+ if (!ctx->debugerr_checked) {
+ ctx->debugerr_checked = true; /* For when this very routine is
+ * invoked from the FP callout */
+ debugerr = pvscsi_debugerr_check(adapter, ctx);
+ if (debugerr == PVSCSI_DEBUGERR_QUEUED)
+ return;
+ }
+
+ callout_stop(&ctx->calloutx); /* disables ABORT or SCSI IO callout */
+ toed = ctx->toed;
+ if (toed) {
+ device_printf(device, "ccb:%p marked for timeout returned with,"
+ "ctx:%p, h:%u s:%u\n", cmd, ctx, btstat, sdstat);
+ }
+#endif /* __FreeBSD__ */
+ pvscsi_unmap_buffers(adapter, ctx);
+ pvscsi_release_context(adapter, ctx);
+
+#ifndef __FreeBSD__
+ cmd->result = 0;
+#endif /* __FreeBSD__ */
+
+ if (sdstat != SAM_STAT_GOOD &&
+ (btstat == BTSTAT_SUCCESS ||
+ btstat == BTSTAT_LINKED_COMMAND_COMPLETED ||
+ btstat == BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG)) {
+#ifndef __FreeBSD__
+ if (sdstat == SAM_STAT_COMMAND_TERMINATED)
+ cmd->result = (DID_RESET << 16);
+ else {
+ cmd->result = (DID_OK << 16) | sdstat;
+ if (sdstat == SAM_STAT_CHECK_CONDITION &&
+ cmd->sense_buffer)
+ cmd->result |= (DRIVER_SENSE << 24);
+ }
+#else /* __FreeBSD__ */
+ cmd->scsi_status = sdstat;
+ if (sdstat == SAM_STAT_COMMAND_TERMINATED)
+ cmd->ccb_h.status = CAM_SCSI_BUS_RESET;
+ else if (sdstat == SAM_STAT_CHECK_CONDITION)
+ cmd->ccb_h.status = CAM_SCSI_STATUS_ERROR |
+ CAM_AUTOSNS_VALID;
+ else
+ cmd->ccb_h.status = CAM_SCSI_STATUS_ERROR;
+#endif /* __FreeBSD__ */
+ } 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.. */
+#ifndef __FreeBSD__
+ cmd->result = (DID_OK << 16);
+#else /* __FreeBSD__ */
+ cmd->scsi_status = sdstat;
+ cmd->ccb_h.status = CAM_REQ_CMP;
+#endif /* __FreeBSD__ */
+ break;
+
+ case BTSTAT_DATARUN:
+ case BTSTAT_DATA_UNDERRUN:
+#ifndef __FreeBSD__
+ /* Report residual data in underruns */
+ scsi_set_resid(cmd, scsi_bufflen(cmd) - e->dataLen);
+ cmd->result = (DID_ERROR << 16);
+#else /* __FreeBSD__ */
+ cmd->scsi_status = sdstat;
+ cmd->ccb_h.status = CAM_DATA_RUN_ERR;
+ cmd->resid = cmd->dxfer_len - e->dataLen;
+#endif /* __FreeBSD__ */
+ break;
+
+ case BTSTAT_SELTIMEO:
+ /* Our emulation returns this for non-connected devs */
+#ifndef __FreeBSD__
+ cmd->result = (DID_BAD_TARGET << 16);
+#else /* __FreeBSD__ */
+ cmd->scsi_status = sdstat;
+ cmd->ccb_h.status = CAM_SEL_TIMEOUT;
+#endif /* __FreeBSD__ */
+ break;
+
+ case BTSTAT_LUNMISMATCH:
+ case BTSTAT_TAGREJECT:
+ case BTSTAT_BADMSG:
+#ifndef __FreeBSD__
+ cmd->result = (DRIVER_INVALID << 24);
+#else /* __FreeBSD__ */
+ cmd->scsi_status = sdstat;
+ cmd->ccb_h.status = CAM_LUN_INVALID;
+ break;
+#endif /* __FreeBSD__ */
+ /* 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:
+#ifndef __FreeBSD__
+ cmd->result |= (DID_ERROR << 16);
+#else /* __FreeBSD__ */
+ cmd->scsi_status = sdstat;
+ cmd->ccb_h.status = CAM_REQ_CMP_ERR;
+#endif /* __FreeBSD__ */
+ break;
+
+ case BTSTAT_SENTRST:
+ case BTSTAT_RECVRST:
+ case BTSTAT_BUSRESET:
+#ifndef __FreeBSD__
+ cmd->result = (DID_RESET << 16);
+#else /* __FreeBSD__ */
+ cmd->scsi_status = sdstat;
+ cmd->ccb_h.status = CAM_SCSI_BUS_RESET;
+#endif /* __FreeBSD__ */
+ break;
+
+ case BTSTAT_ABORTQUEUE:
+#ifndef __FreeBSD__
+ /*
+ * Linux seems to do better with DID_BUS_BUSY instead of
+ * DID_ABORT.
+ */
+ cmd->result = (DID_BUS_BUSY << 16);
+#else /* __FreeBSD__ */
+ cmd->scsi_status = sdstat;
+ device_printf(device, "Command %s\n", toed ?
+ "timedout" : "aborted");
+ if(toed) {
+ cmd->ccb_h.status = CAM_CMD_TIMEOUT;
+ } else {
+ cmd->ccb_h.status = CAM_REQ_ABORTED;
+ }
+#endif /* __FreeBSD__ */
+ break;
+
+ case BTSTAT_SCSIPARITY:
+#ifndef __FreeBSD__
+ cmd->result = (DID_PARITY << 16);
+#else /* __FreeBSD__ */
+ cmd->scsi_status = sdstat;
+ cmd->ccb_h.status = CAM_UNCOR_PARITY;
+#endif /* __FreeBSD__ */
+ break;
+
+ default:
+#ifndef __FreeBSD__
+ cmd->result = (DID_ERROR << 16);
+ LOG(0, "Unknown completion status: 0x%x\n", btstat);
+#else /* __FreeBSD__ */
+ cmd->scsi_status = sdstat;
+ cmd->ccb_h.status = CAM_REQ_CMP_ERR;
+ device_printf(device, "Unknown completion status: "
+ "0x%x\n", btstat);
+#endif /* __FreeBSD__ */
+ }
+
+#ifndef __FreeBSD__
+ LOG(3, "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);
+#else /* __FreeBSD__ */
+ if (debugerr != 0) {
+ /* inject an error */
+ union ccb *ccb = (union ccb *)cmd;
+ ccb->ccb_h.status = CAM_UNCOR_PARITY;
+ ccb->csio.scsi_status = SCSI_STATUS_CHECK_COND;
+ }
+ xpt_done((union ccb *)cmd);
+#endif /* __FreeBSD__ */
+}
+
+/*
+ * 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.
*** DIFF OUTPUT TRUNCATED AT 1000 LINES ***
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