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authorAlok Kataria <akataria@vmware.com>2009-10-13 17:51:05 -0400
committerJames Bottomley <James.Bottomley@suse.de>2009-12-04 13:00:49 -0500
commit851b164231d1117673aa44c00c7622e48b7dfcf4 (patch)
treedd63a44d5865e788b4864b29d7a173e8aa2471ef
parent96e6586556dfa80112f42895be93c561582d9930 (diff)
[SCSI] vmw_pvscsi: SCSI driver for VMware's virtual HBA.
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> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat
-rw-r--r--MAINTAINERS8
-rw-r--r--drivers/scsi/Kconfig8
-rw-r--r--drivers/scsi/Makefile1
-rw-r--r--drivers/scsi/vmw_pvscsi.c1407
-rw-r--r--drivers/scsi/vmw_pvscsi.h397
5 files changed, 1821 insertions, 0 deletions
diff --git a/MAINTAINERS b/MAINTAINERS
index 016411cadc9a..d1a5cfd2c379 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5696,6 +5696,14 @@ L: netdev@vger.kernel.org
5696S: Maintained 5696S: Maintained
5697F: drivers/net/vmxnet3/ 5697F: drivers/net/vmxnet3/
5698 5698
5699VMware PVSCSI driver
5700M: Alok Kataria <akataria@vmware.com>
5701M: VMware PV-Drivers <pv-drivers@vmware.com>
5702L: linux-scsi@vger.kernel.org
5703S: Maintained
5704F: drivers/scsi/vmw_pvscsi.c
5705F: drivers/scsi/vmw_pvscsi.h
5706
5699VOLTAGE AND CURRENT REGULATOR FRAMEWORK 5707VOLTAGE AND CURRENT REGULATOR FRAMEWORK
5700M: Liam Girdwood <lrg@slimlogic.co.uk> 5708M: Liam Girdwood <lrg@slimlogic.co.uk>
5701M: Mark Brown <broonie@opensource.wolfsonmicro.com> 5709M: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index 2e4f7d0ee639..1895259fff0f 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -621,6 +621,14 @@ config SCSI_FLASHPOINT
621 substantial, so users of MultiMaster Host Adapters may not 621 substantial, so users of MultiMaster Host Adapters may not
622 wish to include it. 622 wish to include it.
623 623
624config VMWARE_PVSCSI
625 tristate "VMware PVSCSI driver support"
626 depends on PCI && SCSI && X86
627 help
628 This driver supports VMware's para virtualized SCSI HBA.
629 To compile this driver as a module, choose M here: the
630 module will be called vmw_pvscsi.
631
624config LIBFC 632config LIBFC
625 tristate "LibFC module" 633 tristate "LibFC module"
626 select SCSI_FC_ATTRS 634 select SCSI_FC_ATTRS
diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
index 53b1dac7e7d9..5026bdc7b2b7 100644
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -134,6 +134,7 @@ obj-$(CONFIG_SCSI_CXGB3_ISCSI) += libiscsi.o libiscsi_tcp.o cxgb3i/
134obj-$(CONFIG_SCSI_BNX2_ISCSI) += libiscsi.o bnx2i/ 134obj-$(CONFIG_SCSI_BNX2_ISCSI) += libiscsi.o bnx2i/
135obj-$(CONFIG_BE2ISCSI) += libiscsi.o be2iscsi/ 135obj-$(CONFIG_BE2ISCSI) += libiscsi.o be2iscsi/
136obj-$(CONFIG_SCSI_PMCRAID) += pmcraid.o 136obj-$(CONFIG_SCSI_PMCRAID) += pmcraid.o
137obj-$(CONFIG_VMWARE_PVSCSI) += vmw_pvscsi.o
137 138
138obj-$(CONFIG_ARM) += arm/ 139obj-$(CONFIG_ARM) += arm/
139 140
diff --git a/drivers/scsi/vmw_pvscsi.c b/drivers/scsi/vmw_pvscsi.c
new file mode 100644
index 000000000000..d2604c813a20
--- /dev/null
+++ b/drivers/scsi/vmw_pvscsi.c
@@ -0,0 +1,1407 @@
1/*
2 * Linux driver for VMware's para-virtualized SCSI HBA.
3 *
4 * Copyright (C) 2008-2009, VMware, Inc. All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; version 2 of the License and no later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
13 * NON INFRINGEMENT. See the GNU General Public License for more
14 * details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Maintained by: Alok N Kataria <akataria@vmware.com>
21 *
22 */
23
24#include <linux/kernel.h>
25#include <linux/module.h>
26#include <linux/interrupt.h>
27#include <linux/workqueue.h>
28#include <linux/pci.h>
29
30#include <scsi/scsi.h>
31#include <scsi/scsi_host.h>
32#include <scsi/scsi_cmnd.h>
33#include <scsi/scsi_device.h>
34
35#include "vmw_pvscsi.h"
36
37#define PVSCSI_LINUX_DRIVER_DESC "VMware PVSCSI driver"
38
39MODULE_DESCRIPTION(PVSCSI_LINUX_DRIVER_DESC);
40MODULE_AUTHOR("VMware, Inc.");
41MODULE_LICENSE("GPL");
42MODULE_VERSION(PVSCSI_DRIVER_VERSION_STRING);
43
44#define PVSCSI_DEFAULT_NUM_PAGES_PER_RING 8
45#define PVSCSI_DEFAULT_NUM_PAGES_MSG_RING 1
46#define PVSCSI_DEFAULT_QUEUE_DEPTH 64
47#define SGL_SIZE PAGE_SIZE
48
49struct pvscsi_sg_list {
50 struct PVSCSISGElement sge[PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT];
51};
52
53struct pvscsi_ctx {
54 /*
55 * The index of the context in cmd_map serves as the context ID for a
56 * 1-to-1 mapping completions back to requests.
57 */
58 struct scsi_cmnd *cmd;
59 struct pvscsi_sg_list *sgl;
60 struct list_head list;
61 dma_addr_t dataPA;
62 dma_addr_t sensePA;
63 dma_addr_t sglPA;
64};
65
66struct pvscsi_adapter {
67 char *mmioBase;
68 unsigned int irq;
69 u8 rev;
70 bool use_msi;
71 bool use_msix;
72 bool use_msg;
73
74 spinlock_t hw_lock;
75
76 struct workqueue_struct *workqueue;
77 struct work_struct work;
78
79 struct PVSCSIRingReqDesc *req_ring;
80 unsigned req_pages;
81 unsigned req_depth;
82 dma_addr_t reqRingPA;
83
84 struct PVSCSIRingCmpDesc *cmp_ring;
85 unsigned cmp_pages;
86 dma_addr_t cmpRingPA;
87
88 struct PVSCSIRingMsgDesc *msg_ring;
89 unsigned msg_pages;
90 dma_addr_t msgRingPA;
91
92 struct PVSCSIRingsState *rings_state;
93 dma_addr_t ringStatePA;
94
95 struct pci_dev *dev;
96 struct Scsi_Host *host;
97
98 struct list_head cmd_pool;
99 struct pvscsi_ctx *cmd_map;
100};
101
102
103/* Command line parameters */
104static int pvscsi_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_PER_RING;
105static int pvscsi_msg_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_MSG_RING;
106static int pvscsi_cmd_per_lun = PVSCSI_DEFAULT_QUEUE_DEPTH;
107static bool pvscsi_disable_msi;
108static bool pvscsi_disable_msix;
109static bool pvscsi_use_msg = true;
110
111#define PVSCSI_RW (S_IRUSR | S_IWUSR)
112
113module_param_named(ring_pages, pvscsi_ring_pages, int, PVSCSI_RW);
114MODULE_PARM_DESC(ring_pages, "Number of pages per req/cmp ring - (default="
115 __stringify(PVSCSI_DEFAULT_NUM_PAGES_PER_RING) ")");
116
117module_param_named(msg_ring_pages, pvscsi_msg_ring_pages, int, PVSCSI_RW);
118MODULE_PARM_DESC(msg_ring_pages, "Number of pages for the msg ring - (default="
119 __stringify(PVSCSI_DEFAULT_NUM_PAGES_MSG_RING) ")");
120
121module_param_named(cmd_per_lun, pvscsi_cmd_per_lun, int, PVSCSI_RW);
122MODULE_PARM_DESC(cmd_per_lun, "Maximum commands per lun - (default="
123 __stringify(PVSCSI_MAX_REQ_QUEUE_DEPTH) ")");
124
125module_param_named(disable_msi, pvscsi_disable_msi, bool, PVSCSI_RW);
126MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)");
127
128module_param_named(disable_msix, pvscsi_disable_msix, bool, PVSCSI_RW);
129MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)");
130
131module_param_named(use_msg, pvscsi_use_msg, bool, PVSCSI_RW);
132MODULE_PARM_DESC(use_msg, "Use msg ring when available - (default=1)");
133
134static const struct pci_device_id pvscsi_pci_tbl[] = {
135 { PCI_VDEVICE(VMWARE, PCI_DEVICE_ID_VMWARE_PVSCSI) },
136 { 0 }
137};
138
139MODULE_DEVICE_TABLE(pci, pvscsi_pci_tbl);
140
141static struct device *
142pvscsi_dev(const struct pvscsi_adapter *adapter)
143{
144 return &(adapter->dev->dev);
145}
146
147static struct pvscsi_ctx *
148pvscsi_find_context(const struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd)
149{
150 struct pvscsi_ctx *ctx, *end;
151
152 end = &adapter->cmd_map[adapter->req_depth];
153 for (ctx = adapter->cmd_map; ctx < end; ctx++)
154 if (ctx->cmd == cmd)
155 return ctx;
156
157 return NULL;
158}
159
160static struct pvscsi_ctx *
161pvscsi_acquire_context(struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd)
162{
163 struct pvscsi_ctx *ctx;
164
165 if (list_empty(&adapter->cmd_pool))
166 return NULL;
167
168 ctx = list_first_entry(&adapter->cmd_pool, struct pvscsi_ctx, list);
169 ctx->cmd = cmd;
170 list_del(&ctx->list);
171
172 return ctx;
173}
174
175static void pvscsi_release_context(struct pvscsi_adapter *adapter,
176 struct pvscsi_ctx *ctx)
177{
178 ctx->cmd = NULL;
179 list_add(&ctx->list, &adapter->cmd_pool);
180}
181
182/*
183 * Map a pvscsi_ctx struct to a context ID field value; we map to a simple
184 * non-zero integer. ctx always points to an entry in cmd_map array, hence
185 * the return value is always >=1.
186 */
187static u64 pvscsi_map_context(const struct pvscsi_adapter *adapter,
188 const struct pvscsi_ctx *ctx)
189{
190 return ctx - adapter->cmd_map + 1;
191}
192
193static struct pvscsi_ctx *
194pvscsi_get_context(const struct pvscsi_adapter *adapter, u64 context)
195{
196 return &adapter->cmd_map[context - 1];
197}
198
199static void pvscsi_reg_write(const struct pvscsi_adapter *adapter,
200 u32 offset, u32 val)
201{
202 writel(val, adapter->mmioBase + offset);
203}
204
205static u32 pvscsi_reg_read(const struct pvscsi_adapter *adapter, u32 offset)
206{
207 return readl(adapter->mmioBase + offset);
208}
209
210static u32 pvscsi_read_intr_status(const struct pvscsi_adapter *adapter)
211{
212 return pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_INTR_STATUS);
213}
214
215static void pvscsi_write_intr_status(const struct pvscsi_adapter *adapter,
216 u32 val)
217{
218 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_STATUS, val);
219}
220
221static void pvscsi_unmask_intr(const struct pvscsi_adapter *adapter)
222{
223 u32 intr_bits;
224
225 intr_bits = PVSCSI_INTR_CMPL_MASK;
226 if (adapter->use_msg)
227 intr_bits |= PVSCSI_INTR_MSG_MASK;
228
229 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, intr_bits);
230}
231
232static void pvscsi_mask_intr(const struct pvscsi_adapter *adapter)
233{
234 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, 0);
235}
236
237static void pvscsi_write_cmd_desc(const struct pvscsi_adapter *adapter,
238 u32 cmd, const void *desc, size_t len)
239{
240 const u32 *ptr = desc;
241 size_t i;
242
243 len /= sizeof(*ptr);
244 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND, cmd);
245 for (i = 0; i < len; i++)
246 pvscsi_reg_write(adapter,
247 PVSCSI_REG_OFFSET_COMMAND_DATA, ptr[i]);
248}
249
250static void pvscsi_abort_cmd(const struct pvscsi_adapter *adapter,
251 const struct pvscsi_ctx *ctx)
252{
253 struct PVSCSICmdDescAbortCmd cmd = { 0 };
254
255 cmd.target = ctx->cmd->device->id;
256 cmd.context = pvscsi_map_context(adapter, ctx);
257
258 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ABORT_CMD, &cmd, sizeof(cmd));
259}
260
261static void pvscsi_kick_rw_io(const struct pvscsi_adapter *adapter)
262{
263 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_RW_IO, 0);
264}
265
266static void pvscsi_process_request_ring(const struct pvscsi_adapter *adapter)
267{
268 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_NON_RW_IO, 0);
269}
270
271static int scsi_is_rw(unsigned char op)
272{
273 return op == READ_6 || op == WRITE_6 ||
274 op == READ_10 || op == WRITE_10 ||
275 op == READ_12 || op == WRITE_12 ||
276 op == READ_16 || op == WRITE_16;
277}
278
279static void pvscsi_kick_io(const struct pvscsi_adapter *adapter,
280 unsigned char op)
281{
282 if (scsi_is_rw(op))
283 pvscsi_kick_rw_io(adapter);
284 else
285 pvscsi_process_request_ring(adapter);
286}
287
288static void ll_adapter_reset(const struct pvscsi_adapter *adapter)
289{
290 dev_dbg(pvscsi_dev(adapter), "Adapter Reset on %p\n", adapter);
291
292 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ADAPTER_RESET, NULL, 0);
293}
294
295static void ll_bus_reset(const struct pvscsi_adapter *adapter)
296{
297 dev_dbg(pvscsi_dev(adapter), "Reseting bus on %p\n", adapter);
298
299 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_BUS, NULL, 0);
300}
301
302static void ll_device_reset(const struct pvscsi_adapter *adapter, u32 target)
303{
304 struct PVSCSICmdDescResetDevice cmd = { 0 };
305
306 dev_dbg(pvscsi_dev(adapter), "Reseting device: target=%u\n", target);
307
308 cmd.target = target;
309
310 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_DEVICE,
311 &cmd, sizeof(cmd));
312}
313
314static void pvscsi_create_sg(struct pvscsi_ctx *ctx,
315 struct scatterlist *sg, unsigned count)
316{
317 unsigned i;
318 struct PVSCSISGElement *sge;
319
320 BUG_ON(count > PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT);
321
322 sge = &ctx->sgl->sge[0];
323 for (i = 0; i < count; i++, sg++) {
324 sge[i].addr = sg_dma_address(sg);
325 sge[i].length = sg_dma_len(sg);
326 sge[i].flags = 0;
327 }
328}
329
330/*
331 * Map all data buffers for a command into PCI space and
332 * setup the scatter/gather list if needed.
333 */
334static void pvscsi_map_buffers(struct pvscsi_adapter *adapter,
335 struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd,
336 struct PVSCSIRingReqDesc *e)
337{
338 unsigned count;
339 unsigned bufflen = scsi_bufflen(cmd);
340 struct scatterlist *sg;
341
342 e->dataLen = bufflen;
343 e->dataAddr = 0;
344 if (bufflen == 0)
345 return;
346
347 sg = scsi_sglist(cmd);
348 count = scsi_sg_count(cmd);
349 if (count != 0) {
350 int segs = scsi_dma_map(cmd);
351 if (segs > 1) {
352 pvscsi_create_sg(ctx, sg, segs);
353
354 e->flags |= PVSCSI_FLAG_CMD_WITH_SG_LIST;
355 ctx->sglPA = pci_map_single(adapter->dev, ctx->sgl,
356 SGL_SIZE, PCI_DMA_TODEVICE);
357 e->dataAddr = ctx->sglPA;
358 } else
359 e->dataAddr = sg_dma_address(sg);
360 } else {
361 /*
362 * In case there is no S/G list, scsi_sglist points
363 * directly to the buffer.
364 */
365 ctx->dataPA = pci_map_single(adapter->dev, sg, bufflen,
366 cmd->sc_data_direction);
367 e->dataAddr = ctx->dataPA;
368 }
369}
370
371static void pvscsi_unmap_buffers(const struct pvscsi_adapter *adapter,
372 struct pvscsi_ctx *ctx)
373{
374 struct scsi_cmnd *cmd;
375 unsigned bufflen;
376
377 cmd = ctx->cmd;
378 bufflen = scsi_bufflen(cmd);
379
380 if (bufflen != 0) {
381 unsigned count = scsi_sg_count(cmd);
382
383 if (count != 0) {
384 scsi_dma_unmap(cmd);
385 if (ctx->sglPA) {
386 pci_unmap_single(adapter->dev, ctx->sglPA,
387 SGL_SIZE, PCI_DMA_TODEVICE);
388 ctx->sglPA = 0;
389 }
390 } else
391 pci_unmap_single(adapter->dev, ctx->dataPA, bufflen,
392 cmd->sc_data_direction);
393 }
394 if (cmd->sense_buffer)
395 pci_unmap_single(adapter->dev, ctx->sensePA,
396 SCSI_SENSE_BUFFERSIZE, PCI_DMA_FROMDEVICE);
397}
398
399static int __devinit pvscsi_allocate_rings(struct pvscsi_adapter *adapter)
400{
401 adapter->rings_state = pci_alloc_consistent(adapter->dev, PAGE_SIZE,
402 &adapter->ringStatePA);
403 if (!adapter->rings_state)
404 return -ENOMEM;
405
406 adapter->req_pages = min(PVSCSI_MAX_NUM_PAGES_REQ_RING,
407 pvscsi_ring_pages);
408 adapter->req_depth = adapter->req_pages
409 * PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
410 adapter->req_ring = pci_alloc_consistent(adapter->dev,
411 adapter->req_pages * PAGE_SIZE,
412 &adapter->reqRingPA);
413 if (!adapter->req_ring)
414 return -ENOMEM;
415
416 adapter->cmp_pages = min(PVSCSI_MAX_NUM_PAGES_CMP_RING,
417 pvscsi_ring_pages);
418 adapter->cmp_ring = pci_alloc_consistent(adapter->dev,
419 adapter->cmp_pages * PAGE_SIZE,
420 &adapter->cmpRingPA);
421 if (!adapter->cmp_ring)
422 return -ENOMEM;
423
424 BUG_ON(!IS_ALIGNED(adapter->ringStatePA, PAGE_SIZE));
425 BUG_ON(!IS_ALIGNED(adapter->reqRingPA, PAGE_SIZE));
426 BUG_ON(!IS_ALIGNED(adapter->cmpRingPA, PAGE_SIZE));
427
428 if (!adapter->use_msg)
429 return 0;
430
431 adapter->msg_pages = min(PVSCSI_MAX_NUM_PAGES_MSG_RING,
432 pvscsi_msg_ring_pages);
433 adapter->msg_ring = pci_alloc_consistent(adapter->dev,
434 adapter->msg_pages * PAGE_SIZE,
435 &adapter->msgRingPA);
436 if (!adapter->msg_ring)
437 return -ENOMEM;
438 BUG_ON(!IS_ALIGNED(adapter->msgRingPA, PAGE_SIZE));
439
440 return 0;
441}
442
443static void pvscsi_setup_all_rings(const struct pvscsi_adapter *adapter)
444{
445 struct PVSCSICmdDescSetupRings cmd = { 0 };
446 dma_addr_t base;
447 unsigned i;
448
449 cmd.ringsStatePPN = adapter->ringStatePA >> PAGE_SHIFT;
450 cmd.reqRingNumPages = adapter->req_pages;
451 cmd.cmpRingNumPages = adapter->cmp_pages;
452
453 base = adapter->reqRingPA;
454 for (i = 0; i < adapter->req_pages; i++) {
455 cmd.reqRingPPNs[i] = base >> PAGE_SHIFT;
456 base += PAGE_SIZE;
457 }
458
459 base = adapter->cmpRingPA;
460 for (i = 0; i < adapter->cmp_pages; i++) {
461 cmd.cmpRingPPNs[i] = base >> PAGE_SHIFT;
462 base += PAGE_SIZE;
463 }
464
465 memset(adapter->rings_state, 0, PAGE_SIZE);
466 memset(adapter->req_ring, 0, adapter->req_pages * PAGE_SIZE);
467 memset(adapter->cmp_ring, 0, adapter->cmp_pages * PAGE_SIZE);
468
469 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_SETUP_RINGS,
470 &cmd, sizeof(cmd));
471
472 if (adapter->use_msg) {
473 struct PVSCSICmdDescSetupMsgRing cmd_msg = { 0 };
474
475 cmd_msg.numPages = adapter->msg_pages;
476
477 base = adapter->msgRingPA;
478 for (i = 0; i < adapter->msg_pages; i++) {
479 cmd_msg.ringPPNs[i] = base >> PAGE_SHIFT;
480 base += PAGE_SIZE;
481 }
482 memset(adapter->msg_ring, 0, adapter->msg_pages * PAGE_SIZE);
483
484 pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_SETUP_MSG_RING,
485 &cmd_msg, sizeof(cmd_msg));
486 }
487}
488
489/*
490 * Pull a completion descriptor off and pass the completion back
491 * to the SCSI mid layer.
492 */
493static void pvscsi_complete_request(struct pvscsi_adapter *adapter,
494 const struct PVSCSIRingCmpDesc *e)
495{
496 struct pvscsi_ctx *ctx;
497 struct scsi_cmnd *cmd;
498 u32 btstat = e->hostStatus;
499 u32 sdstat = e->scsiStatus;
500
501 ctx = pvscsi_get_context(adapter, e->context);
502 cmd = ctx->cmd;
503 pvscsi_unmap_buffers(adapter, ctx);
504 pvscsi_release_context(adapter, ctx);
505 cmd->result = 0;
506
507 if (sdstat != SAM_STAT_GOOD &&
508 (btstat == BTSTAT_SUCCESS ||
509 btstat == BTSTAT_LINKED_COMMAND_COMPLETED ||
510 btstat == BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG)) {
511 cmd->result = (DID_OK << 16) | sdstat;
512 if (sdstat == SAM_STAT_CHECK_CONDITION && cmd->sense_buffer)
513 cmd->result |= (DRIVER_SENSE << 24);
514 } else
515 switch (btstat) {
516 case BTSTAT_SUCCESS:
517 case BTSTAT_LINKED_COMMAND_COMPLETED:
518 case BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG:
519 /* If everything went fine, let's move on.. */
520 cmd->result = (DID_OK << 16);
521 break;
522
523 case BTSTAT_DATARUN:
524 case BTSTAT_DATA_UNDERRUN:
525 /* Report residual data in underruns */
526 scsi_set_resid(cmd, scsi_bufflen(cmd) - e->dataLen);
527 cmd->result = (DID_ERROR << 16);
528 break;
529
530 case BTSTAT_SELTIMEO:
531 /* Our emulation returns this for non-connected devs */
532 cmd->result = (DID_BAD_TARGET << 16);
533 break;
534
535 case BTSTAT_LUNMISMATCH:
536 case BTSTAT_TAGREJECT:
537 case BTSTAT_BADMSG:
538 cmd->result = (DRIVER_INVALID << 24);
539 /* fall through */
540
541 case BTSTAT_HAHARDWARE:
542 case BTSTAT_INVPHASE:
543 case BTSTAT_HATIMEOUT:
544 case BTSTAT_NORESPONSE:
545 case BTSTAT_DISCONNECT:
546 case BTSTAT_HASOFTWARE:
547 case BTSTAT_BUSFREE:
548 case BTSTAT_SENSFAILED:
549 cmd->result |= (DID_ERROR << 16);
550 break;
551
552 case BTSTAT_SENTRST:
553 case BTSTAT_RECVRST:
554 case BTSTAT_BUSRESET:
555 cmd->result = (DID_RESET << 16);
556 break;
557
558 case BTSTAT_ABORTQUEUE:
559 cmd->result = (DID_ABORT << 16);
560 break;
561
562 case BTSTAT_SCSIPARITY:
563 cmd->result = (DID_PARITY << 16);
564 break;
565
566 default:
567 cmd->result = (DID_ERROR << 16);
568 scmd_printk(KERN_DEBUG, cmd,
569 "Unknown completion status: 0x%x\n",
570 btstat);
571 }
572
573 dev_dbg(&cmd->device->sdev_gendev,
574 "cmd=%p %x ctx=%p result=0x%x status=0x%x,%x\n",
575 cmd, cmd->cmnd[0], ctx, cmd->result, btstat, sdstat);
576
577 cmd->scsi_done(cmd);
578}
579
580/*
581 * barrier usage : Since the PVSCSI device is emulated, there could be cases
582 * where we may want to serialize some accesses between the driver and the
583 * emulation layer. We use compiler barriers instead of the more expensive
584 * memory barriers because PVSCSI is only supported on X86 which has strong
585 * memory access ordering.
586 */
587static void pvscsi_process_completion_ring(struct pvscsi_adapter *adapter)
588{
589 struct PVSCSIRingsState *s = adapter->rings_state;
590 struct PVSCSIRingCmpDesc *ring = adapter->cmp_ring;
591 u32 cmp_entries = s->cmpNumEntriesLog2;
592
593 while (s->cmpConsIdx != s->cmpProdIdx) {
594 struct PVSCSIRingCmpDesc *e = ring + (s->cmpConsIdx &
595 MASK(cmp_entries));
596 /*
597 * This barrier() ensures that *e is not dereferenced while
598 * the device emulation still writes data into the slot.
599 * Since the device emulation advances s->cmpProdIdx only after
600 * updating the slot we want to check it first.
601 */
602 barrier();
603 pvscsi_complete_request(adapter, e);
604 /*
605 * This barrier() ensures that compiler doesn't reorder write
606 * to s->cmpConsIdx before the read of (*e) inside
607 * pvscsi_complete_request. Otherwise, device emulation may
608 * overwrite *e before we had a chance to read it.
609 */
610 barrier();
611 s->cmpConsIdx++;
612 }
613}
614
615/*
616 * Translate a Linux SCSI request into a request ring entry.
617 */
618static int pvscsi_queue_ring(struct pvscsi_adapter *adapter,
619 struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd)
620{
621 struct PVSCSIRingsState *s;
622 struct PVSCSIRingReqDesc *e;
623 struct scsi_device *sdev;
624 u32 req_entries;
625
626 s = adapter->rings_state;
627 sdev = cmd->device;
628 req_entries = s->reqNumEntriesLog2;
629
630 /*
631 * If this condition holds, we might have room on the request ring, but
632 * we might not have room on the completion ring for the response.
633 * However, we have already ruled out this possibility - we would not
634 * have successfully allocated a context if it were true, since we only
635 * have one context per request entry. Check for it anyway, since it
636 * would be a serious bug.
637 */
638 if (s->reqProdIdx - s->cmpConsIdx >= 1 << req_entries) {
639 scmd_printk(KERN_ERR, cmd, "vmw_pvscsi: "
640 "ring full: reqProdIdx=%d cmpConsIdx=%d\n",
641 s->reqProdIdx, s->cmpConsIdx);
642 return -1;
643 }
644
645 e = adapter->req_ring + (s->reqProdIdx & MASK(req_entries));
646
647 e->bus = sdev->channel;
648 e->target = sdev->id;
649 memset(e->lun, 0, sizeof(e->lun));
650 e->lun[1] = sdev->lun;
651
652 if (cmd->sense_buffer) {
653 ctx->sensePA = pci_map_single(adapter->dev, cmd->sense_buffer,
654 SCSI_SENSE_BUFFERSIZE,
655 PCI_DMA_FROMDEVICE);
656 e->senseAddr = ctx->sensePA;
657 e->senseLen = SCSI_SENSE_BUFFERSIZE;
658 } else {
659 e->senseLen = 0;
660 e->senseAddr = 0;
661 }
662 e->cdbLen = cmd->cmd_len;
663 e->vcpuHint = smp_processor_id();
664 memcpy(e->cdb, cmd->cmnd, e->cdbLen);
665
666 e->tag = SIMPLE_QUEUE_TAG;
667 if (sdev->tagged_supported &&
668 (cmd->tag == HEAD_OF_QUEUE_TAG ||
669 cmd->tag == ORDERED_QUEUE_TAG))
670 e->tag = cmd->tag;
671
672 if (cmd->sc_data_direction == DMA_FROM_DEVICE)
673 e->flags = PVSCSI_FLAG_CMD_DIR_TOHOST;
674 else if (cmd->sc_data_direction == DMA_TO_DEVICE)
675 e->flags = PVSCSI_FLAG_CMD_DIR_TODEVICE;
676 else if (cmd->sc_data_direction == DMA_NONE)
677 e->flags = PVSCSI_FLAG_CMD_DIR_NONE;
678 else
679 e->flags = 0;
680
681 pvscsi_map_buffers(adapter, ctx, cmd, e);
682
683 e->context = pvscsi_map_context(adapter, ctx);
684
685 barrier();
686
687 s->reqProdIdx++;
688
689 return 0;
690}
691
692static int pvscsi_queue(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
693{
694 struct Scsi_Host *host = cmd->device->host;
695 struct pvscsi_adapter *adapter = shost_priv(host);
696 struct pvscsi_ctx *ctx;
697 unsigned long flags;
698
699 spin_lock_irqsave(&adapter->hw_lock, flags);
700
701 ctx = pvscsi_acquire_context(adapter, cmd);
702 if (!ctx || pvscsi_queue_ring(adapter, ctx, cmd) != 0) {
703 if (ctx)
704 pvscsi_release_context(adapter, ctx);
705 spin_unlock_irqrestore(&adapter->hw_lock, flags);
706 return SCSI_MLQUEUE_HOST_BUSY;
707 }
708
709 cmd->scsi_done = done;
710
711 dev_dbg(&cmd->device->sdev_gendev,
712 "queued cmd %p, ctx %p, op=%x\n", cmd, ctx, cmd->cmnd[0]);
713
714 spin_unlock_irqrestore(&adapter->hw_lock, flags);
715
716 pvscsi_kick_io(adapter, cmd->cmnd[0]);
717
718 return 0;
719}
720
721static int pvscsi_abort(struct scsi_cmnd *cmd)
722{
723 struct pvscsi_adapter *adapter = shost_priv(cmd->device->host);
724 struct pvscsi_ctx *ctx;
725 unsigned long flags;
726
727 scmd_printk(KERN_DEBUG, cmd, "task abort on host %u, %p\n",
728 adapter->host->host_no, cmd);
729
730 spin_lock_irqsave(&adapter->hw_lock, flags);
731
732 /*
733 * Poll the completion ring first - we might be trying to abort
734 * a command that is waiting to be dispatched in the completion ring.
735 */
736 pvscsi_process_completion_ring(adapter);
737
738 /*
739 * If there is no context for the command, it either already succeeded
740 * or else was never properly issued. Not our problem.
741 */
742 ctx = pvscsi_find_context(adapter, cmd);
743 if (!ctx) {
744 scmd_printk(KERN_DEBUG, cmd, "Failed to abort cmd %p\n", cmd);
745 goto out;
746 }
747
748 pvscsi_abort_cmd(adapter, ctx);
749
750 pvscsi_process_completion_ring(adapter);
751
752out:
753 spin_unlock_irqrestore(&adapter->hw_lock, flags);
754 return SUCCESS;
755}
756
757/*
758 * Abort all outstanding requests. This is only safe to use if the completion
759 * ring will never be walked again or the device has been reset, because it
760 * destroys the 1-1 mapping between context field passed to emulation and our
761 * request structure.
762 */
763static void pvscsi_reset_all(struct pvscsi_adapter *adapter)
764{
765 unsigned i;
766
767 for (i = 0; i < adapter->req_depth; i++) {
768 struct pvscsi_ctx *ctx = &adapter->cmd_map[i];
769 struct scsi_cmnd *cmd = ctx->cmd;
770 if (cmd) {
771 scmd_printk(KERN_ERR, cmd,
772 "Forced reset on cmd %p\n", cmd);
773 pvscsi_unmap_buffers(adapter, ctx);
774 pvscsi_release_context(adapter, ctx);
775 cmd->result = (DID_RESET << 16);
776 cmd->scsi_done(cmd);
777 }
778 }
779}
780
781static int pvscsi_host_reset(struct scsi_cmnd *cmd)
782{
783 struct Scsi_Host *host = cmd->device->host;
784 struct pvscsi_adapter *adapter = shost_priv(host);
785 unsigned long flags;
786 bool use_msg;
787
788 scmd_printk(KERN_INFO, cmd, "SCSI Host reset\n");
789
790 spin_lock_irqsave(&adapter->hw_lock, flags);
791
792 use_msg = adapter->use_msg;
793
794 if (use_msg) {
795 adapter->use_msg = 0;
796 spin_unlock_irqrestore(&adapter->hw_lock, flags);
797
798 /*
799 * Now that we know that the ISR won't add more work on the
800 * workqueue we can safely flush any outstanding work.
801 */
802 flush_workqueue(adapter->workqueue);
803 spin_lock_irqsave(&adapter->hw_lock, flags);
804 }
805
806 /*
807 * We're going to tear down the entire ring structure and set it back
808 * up, so stalling new requests until all completions are flushed and
809 * the rings are back in place.
810 */
811
812 pvscsi_process_request_ring(adapter);
813
814 ll_adapter_reset(adapter);
815
816 /*
817 * Now process any completions. Note we do this AFTER adapter reset,
818 * which is strange, but stops races where completions get posted
819 * between processing the ring and issuing the reset. The backend will
820 * not touch the ring memory after reset, so the immediately pre-reset
821 * completion ring state is still valid.
822 */
823 pvscsi_process_completion_ring(adapter);
824
825 pvscsi_reset_all(adapter);
826 adapter->use_msg = use_msg;
827 pvscsi_setup_all_rings(adapter);
828 pvscsi_unmask_intr(adapter);
829
830 spin_unlock_irqrestore(&adapter->hw_lock, flags);
831
832 return SUCCESS;
833}
834
835static int pvscsi_bus_reset(struct scsi_cmnd *cmd)
836{
837 struct Scsi_Host *host = cmd->device->host;
838 struct pvscsi_adapter *adapter = shost_priv(host);
839 unsigned long flags;
840
841 scmd_printk(KERN_INFO, cmd, "SCSI Bus reset\n");
842
843 /*
844 * We don't want to queue new requests for this bus after
845 * flushing all pending requests to emulation, since new
846 * requests could then sneak in during this bus reset phase,
847 * so take the lock now.
848 */
849 spin_lock_irqsave(&adapter->hw_lock, flags);
850
851 pvscsi_process_request_ring(adapter);
852 ll_bus_reset(adapter);
853 pvscsi_process_completion_ring(adapter);
854
855 spin_unlock_irqrestore(&adapter->hw_lock, flags);
856
857 return SUCCESS;
858}
859
860static int pvscsi_device_reset(struct scsi_cmnd *cmd)
861{
862 struct Scsi_Host *host = cmd->device->host;
863 struct pvscsi_adapter *adapter = shost_priv(host);
864 unsigned long flags;
865
866 scmd_printk(KERN_INFO, cmd, "SCSI device reset on scsi%u:%u\n",
867 host->host_no, cmd->device->id);
868
869 /*
870 * We don't want to queue new requests for this device after flushing
871 * all pending requests to emulation, since new requests could then
872 * sneak in during this device reset phase, so take the lock now.
873 */
874 spin_lock_irqsave(&adapter->hw_lock, flags);
875
876 pvscsi_process_request_ring(adapter);
877 ll_device_reset(adapter, cmd->device->id);
878 pvscsi_process_completion_ring(adapter);
879
880 spin_unlock_irqrestore(&adapter->hw_lock, flags);
881
882 return SUCCESS;
883}
884
885static struct scsi_host_template pvscsi_template;
886
887static const char *pvscsi_info(struct Scsi_Host *host)
888{
889 struct pvscsi_adapter *adapter = shost_priv(host);
890 static char buf[256];
891
892 sprintf(buf, "VMware PVSCSI storage adapter rev %d, req/cmp/msg rings: "
893 "%u/%u/%u pages, cmd_per_lun=%u", adapter->rev,
894 adapter->req_pages, adapter->cmp_pages, adapter->msg_pages,
895 pvscsi_template.cmd_per_lun);
896
897 return buf;
898}
899
900static struct scsi_host_template pvscsi_template = {
901 .module = THIS_MODULE,
902 .name = "VMware PVSCSI Host Adapter",
903 .proc_name = "vmw_pvscsi",
904 .info = pvscsi_info,
905 .queuecommand = pvscsi_queue,
906 .this_id = -1,
907 .sg_tablesize = PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT,
908 .dma_boundary = UINT_MAX,
909 .max_sectors = 0xffff,
910 .use_clustering = ENABLE_CLUSTERING,
911 .eh_abort_handler = pvscsi_abort,
912 .eh_device_reset_handler = pvscsi_device_reset,
913 .eh_bus_reset_handler = pvscsi_bus_reset,
914 .eh_host_reset_handler = pvscsi_host_reset,
915};
916
917static void pvscsi_process_msg(const struct pvscsi_adapter *adapter,
918 const struct PVSCSIRingMsgDesc *e)
919{
920 struct PVSCSIRingsState *s = adapter->rings_state;
921 struct Scsi_Host *host = adapter->host;
922 struct scsi_device *sdev;
923
924 printk(KERN_INFO "vmw_pvscsi: msg type: 0x%x - MSG RING: %u/%u (%u) \n",
925 e->type, s->msgProdIdx, s->msgConsIdx, s->msgNumEntriesLog2);
926
927 BUILD_BUG_ON(PVSCSI_MSG_LAST != 2);
928
929 if (e->type == PVSCSI_MSG_DEV_ADDED) {
930 struct PVSCSIMsgDescDevStatusChanged *desc;
931 desc = (struct PVSCSIMsgDescDevStatusChanged *)e;
932
933 printk(KERN_INFO
934 "vmw_pvscsi: msg: device added at scsi%u:%u:%u\n",
935 desc->bus, desc->target, desc->lun[1]);
936
937 if (!scsi_host_get(host))
938 return;
939
940 sdev = scsi_device_lookup(host, desc->bus, desc->target,
941 desc->lun[1]);
942 if (sdev) {
943 printk(KERN_INFO "vmw_pvscsi: device already exists\n");
944 scsi_device_put(sdev);
945 } else
946 scsi_add_device(adapter->host, desc->bus,
947 desc->target, desc->lun[1]);
948
949 scsi_host_put(host);
950 } else if (e->type == PVSCSI_MSG_DEV_REMOVED) {
951 struct PVSCSIMsgDescDevStatusChanged *desc;
952 desc = (struct PVSCSIMsgDescDevStatusChanged *)e;
953
954 printk(KERN_INFO
955 "vmw_pvscsi: msg: device removed at scsi%u:%u:%u\n",
956 desc->bus, desc->target, desc->lun[1]);
957
958 if (!scsi_host_get(host))
959 return;
960
961 sdev = scsi_device_lookup(host, desc->bus, desc->target,
962 desc->lun[1]);
963 if (sdev) {
964 scsi_remove_device(sdev);
965 scsi_device_put(sdev);
966 } else
967 printk(KERN_INFO
968 "vmw_pvscsi: failed to lookup scsi%u:%u:%u\n",
969 desc->bus, desc->target, desc->lun[1]);
970
971 scsi_host_put(host);
972 }
973}
974
975static int pvscsi_msg_pending(const struct pvscsi_adapter *adapter)
976{
977 struct PVSCSIRingsState *s = adapter->rings_state;
978
979 return s->msgProdIdx != s->msgConsIdx;
980}
981
982static void pvscsi_process_msg_ring(const struct pvscsi_adapter *adapter)
983{
984 struct PVSCSIRingsState *s = adapter->rings_state;
985 struct PVSCSIRingMsgDesc *ring = adapter->msg_ring;
986 u32 msg_entries = s->msgNumEntriesLog2;
987
988 while (pvscsi_msg_pending(adapter)) {
989 struct PVSCSIRingMsgDesc *e = ring + (s->msgConsIdx &
990 MASK(msg_entries));
991
992 barrier();
993 pvscsi_process_msg(adapter, e);
994 barrier();
995 s->msgConsIdx++;
996 }
997}
998
999static void pvscsi_msg_workqueue_handler(struct work_struct *data)
1000{
1001 struct pvscsi_adapter *adapter;
1002
1003 adapter = container_of(data, struct pvscsi_adapter, work);
1004
1005 pvscsi_process_msg_ring(adapter);
1006}
1007
1008static int pvscsi_setup_msg_workqueue(struct pvscsi_adapter *adapter)
1009{
1010 char name[32];
1011
1012 if (!pvscsi_use_msg)
1013 return 0;
1014
1015 pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND,
1016 PVSCSI_CMD_SETUP_MSG_RING);
1017
1018 if (pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_COMMAND_STATUS) == -1)
1019 return 0;
1020
1021 snprintf(name, sizeof(name),
1022 "vmw_pvscsi_wq_%u", adapter->host->host_no);
1023
1024 adapter->workqueue = create_singlethread_workqueue(name);
1025 if (!adapter->workqueue) {
1026 printk(KERN_ERR "vmw_pvscsi: failed to create work queue\n");
1027 return 0;
1028 }
1029 INIT_WORK(&adapter->work, pvscsi_msg_workqueue_handler);
1030
1031 return 1;
1032}
1033
1034static irqreturn_t pvscsi_isr(int irq, void *devp)
1035{
1036 struct pvscsi_adapter *adapter = devp;
1037 int handled;
1038
1039 if (adapter->use_msi || adapter->use_msix)
1040 handled = true;
1041 else {
1042 u32 val = pvscsi_read_intr_status(adapter);
1043 handled = (val & PVSCSI_INTR_ALL_SUPPORTED) != 0;
1044 if (handled)
1045 pvscsi_write_intr_status(devp, val);
1046 }
1047
1048 if (handled) {
1049 unsigned long flags;
1050
1051 spin_lock_irqsave(&adapter->hw_lock, flags);
1052
1053 pvscsi_process_completion_ring(adapter);
1054 if (adapter->use_msg && pvscsi_msg_pending(adapter))
1055 queue_work(adapter->workqueue, &adapter->work);
1056
1057 spin_unlock_irqrestore(&adapter->hw_lock, flags);
1058 }
1059
1060 return IRQ_RETVAL(handled);
1061}
1062
1063static void pvscsi_free_sgls(const struct pvscsi_adapter *adapter)
1064{
1065 struct pvscsi_ctx *ctx = adapter->cmd_map;
1066 unsigned i;
1067
1068 for (i = 0; i < adapter->req_depth; ++i, ++ctx)
1069 free_pages((unsigned long)ctx->sgl, get_order(SGL_SIZE));
1070}
1071
1072static int pvscsi_setup_msix(const struct pvscsi_adapter *adapter, int *irq)
1073{
1074 struct msix_entry entry = { 0, PVSCSI_VECTOR_COMPLETION };
1075 int ret;
1076
1077 ret = pci_enable_msix(adapter->dev, &entry, 1);
1078 if (ret)
1079 return ret;
1080
1081 *irq = entry.vector;
1082
1083 return 0;
1084}
1085
1086static void pvscsi_shutdown_intr(struct pvscsi_adapter *adapter)
1087{
1088 if (adapter->irq) {
1089 free_irq(adapter->irq, adapter);
1090 adapter->irq = 0;
1091 }
1092 if (adapter->use_msi) {
1093 pci_disable_msi(adapter->dev);
1094 adapter->use_msi = 0;
1095 } else if (adapter->use_msix) {
1096 pci_disable_msix(adapter->dev);
1097 adapter->use_msix = 0;
1098 }
1099}
1100
1101static void pvscsi_release_resources(struct pvscsi_adapter *adapter)
1102{
1103 pvscsi_shutdown_intr(adapter);
1104
1105 if (adapter->workqueue)
1106 destroy_workqueue(adapter->workqueue);
1107
1108 if (adapter->mmioBase)
1109 pci_iounmap(adapter->dev, adapter->mmioBase);
1110
1111 pci_release_regions(adapter->dev);
1112
1113 if (adapter->cmd_map) {
1114 pvscsi_free_sgls(adapter);
1115 kfree(adapter->cmd_map);
1116 }
1117
1118 if (adapter->rings_state)
1119 pci_free_consistent(adapter->dev, PAGE_SIZE,
1120 adapter->rings_state, adapter->ringStatePA);
1121
1122 if (adapter->req_ring)
1123 pci_free_consistent(adapter->dev,
1124 adapter->req_pages * PAGE_SIZE,
1125 adapter->req_ring, adapter->reqRingPA);
1126
1127 if (adapter->cmp_ring)
1128 pci_free_consistent(adapter->dev,
1129 adapter->cmp_pages * PAGE_SIZE,
1130 adapter->cmp_ring, adapter->cmpRingPA);
1131
1132 if (adapter->msg_ring)
1133 pci_free_consistent(adapter->dev,
1134 adapter->msg_pages * PAGE_SIZE,
1135 adapter->msg_ring, adapter->msgRingPA);
1136}
1137
1138/*
1139 * Allocate scatter gather lists.
1140 *
1141 * These are statically allocated. Trying to be clever was not worth it.
1142 *
1143 * Dynamic allocation can fail, and we can't go deeep into the memory
1144 * allocator, since we're a SCSI driver, and trying too hard to allocate
1145 * memory might generate disk I/O. We also don't want to fail disk I/O
1146 * in that case because we can't get an allocation - the I/O could be
1147 * trying to swap out data to free memory. Since that is pathological,
1148 * just use a statically allocated scatter list.
1149 *
1150 */
1151static int __devinit pvscsi_allocate_sg(struct pvscsi_adapter *adapter)
1152{
1153 struct pvscsi_ctx *ctx;
1154 int i;
1155
1156 ctx = adapter->cmd_map;
1157 BUILD_BUG_ON(sizeof(struct pvscsi_sg_list) > SGL_SIZE);
1158
1159 for (i = 0; i < adapter->req_depth; ++i, ++ctx) {
1160 ctx->sgl = (void *)__get_free_pages(GFP_KERNEL,
1161 get_order(SGL_SIZE));
1162 ctx->sglPA = 0;
1163 BUG_ON(!IS_ALIGNED(((unsigned long)ctx->sgl), PAGE_SIZE));
1164 if (!ctx->sgl) {
1165 for (; i >= 0; --i, --ctx) {
1166 free_pages((unsigned long)ctx->sgl,
1167 get_order(SGL_SIZE));
1168 ctx->sgl = NULL;
1169 }
1170 return -ENOMEM;
1171 }
1172 }
1173
1174 return 0;
1175}
1176
1177static int __devinit pvscsi_probe(struct pci_dev *pdev,
1178 const struct pci_device_id *id)
1179{
1180 struct pvscsi_adapter *adapter;
1181 struct Scsi_Host *host;
1182 unsigned int i;
1183 unsigned long flags = 0;
1184 int error;
1185
1186 error = -ENODEV;
1187
1188 if (pci_enable_device(pdev))
1189 return error;
1190
1191 if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) == 0 &&
1192 pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)) == 0) {
1193 printk(KERN_INFO "vmw_pvscsi: using 64bit dma\n");
1194 } else if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) == 0 &&
1195 pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)) == 0) {
1196 printk(KERN_INFO "vmw_pvscsi: using 32bit dma\n");
1197 } else {
1198 printk(KERN_ERR "vmw_pvscsi: failed to set DMA mask\n");
1199 goto out_disable_device;
1200 }
1201
1202 pvscsi_template.can_queue =
1203 min(PVSCSI_MAX_NUM_PAGES_REQ_RING, pvscsi_ring_pages) *
1204 PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
1205 pvscsi_template.cmd_per_lun =
1206 min(pvscsi_template.can_queue, pvscsi_cmd_per_lun);
1207 host = scsi_host_alloc(&pvscsi_template, sizeof(struct pvscsi_adapter));
1208 if (!host) {
1209 printk(KERN_ERR "vmw_pvscsi: failed to allocate host\n");
1210 goto out_disable_device;
1211 }
1212
1213 adapter = shost_priv(host);
1214 memset(adapter, 0, sizeof(*adapter));
1215 adapter->dev = pdev;
1216 adapter->host = host;
1217
1218 spin_lock_init(&adapter->hw_lock);
1219
1220 host->max_channel = 0;
1221 host->max_id = 16;
1222 host->max_lun = 1;
1223 host->max_cmd_len = 16;
1224
1225 adapter->rev = pdev->revision;
1226
1227 if (pci_request_regions(pdev, "vmw_pvscsi")) {
1228 printk(KERN_ERR "vmw_pvscsi: pci memory selection failed\n");
1229 goto out_free_host;
1230 }
1231
1232 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
1233 if ((pci_resource_flags(pdev, i) & PCI_BASE_ADDRESS_SPACE_IO))
1234 continue;
1235
1236 if (pci_resource_len(pdev, i) < PVSCSI_MEM_SPACE_SIZE)
1237 continue;
1238
1239 break;
1240 }
1241
1242 if (i == DEVICE_COUNT_RESOURCE) {
1243 printk(KERN_ERR
1244 "vmw_pvscsi: adapter has no suitable MMIO region\n");
1245 goto out_release_resources;
1246 }
1247
1248 adapter->mmioBase = pci_iomap(pdev, i, PVSCSI_MEM_SPACE_SIZE);
1249
1250 if (!adapter->mmioBase) {
1251 printk(KERN_ERR
1252 "vmw_pvscsi: can't iomap for BAR %d memsize %lu\n",
1253 i, PVSCSI_MEM_SPACE_SIZE);
1254 goto out_release_resources;
1255 }
1256
1257 pci_set_master(pdev);
1258 pci_set_drvdata(pdev, host);
1259
1260 ll_adapter_reset(adapter);
1261
1262 adapter->use_msg = pvscsi_setup_msg_workqueue(adapter);
1263
1264 error = pvscsi_allocate_rings(adapter);
1265 if (error) {
1266 printk(KERN_ERR "vmw_pvscsi: unable to allocate ring memory\n");
1267 goto out_release_resources;
1268 }
1269
1270 /*
1271 * From this point on we should reset the adapter if anything goes
1272 * wrong.
1273 */
1274 pvscsi_setup_all_rings(adapter);
1275
1276 adapter->cmd_map = kcalloc(adapter->req_depth,
1277 sizeof(struct pvscsi_ctx), GFP_KERNEL);
1278 if (!adapter->cmd_map) {
1279 printk(KERN_ERR "vmw_pvscsi: failed to allocate memory.\n");
1280 error = -ENOMEM;
1281 goto out_reset_adapter;
1282 }
1283
1284 INIT_LIST_HEAD(&adapter->cmd_pool);
1285 for (i = 0; i < adapter->req_depth; i++) {
1286 struct pvscsi_ctx *ctx = adapter->cmd_map + i;
1287 list_add(&ctx->list, &adapter->cmd_pool);
1288 }
1289
1290 error = pvscsi_allocate_sg(adapter);
1291 if (error) {
1292 printk(KERN_ERR "vmw_pvscsi: unable to allocate s/g table\n");
1293 goto out_reset_adapter;
1294 }
1295
1296 if (!pvscsi_disable_msix &&
1297 pvscsi_setup_msix(adapter, &adapter->irq) == 0) {
1298 printk(KERN_INFO "vmw_pvscsi: using MSI-X\n");
1299 adapter->use_msix = 1;
1300 } else if (!pvscsi_disable_msi && pci_enable_msi(pdev) == 0) {
1301 printk(KERN_INFO "vmw_pvscsi: using MSI\n");
1302 adapter->use_msi = 1;
1303 adapter->irq = pdev->irq;
1304 } else {
1305 printk(KERN_INFO "vmw_pvscsi: using INTx\n");
1306 adapter->irq = pdev->irq;
1307 flags = IRQF_SHARED;
1308 }
1309
1310 error = request_irq(adapter->irq, pvscsi_isr, flags,
1311 "vmw_pvscsi", adapter);
1312 if (error) {
1313 printk(KERN_ERR
1314 "vmw_pvscsi: unable to request IRQ: %d\n", error);
1315 adapter->irq = 0;
1316 goto out_reset_adapter;
1317 }
1318
1319 error = scsi_add_host(host, &pdev->dev);
1320 if (error) {
1321 printk(KERN_ERR
1322 "vmw_pvscsi: scsi_add_host failed: %d\n", error);
1323 goto out_reset_adapter;
1324 }
1325
1326 dev_info(&pdev->dev, "VMware PVSCSI rev %d host #%u\n",
1327 adapter->rev, host->host_no);
1328
1329 pvscsi_unmask_intr(adapter);
1330
1331 scsi_scan_host(host);
1332
1333 return 0;
1334
1335out_reset_adapter:
1336 ll_adapter_reset(adapter);
1337out_release_resources:
1338 pvscsi_release_resources(adapter);
1339out_free_host:
1340 scsi_host_put(host);
1341out_disable_device:
1342 pci_set_drvdata(pdev, NULL);
1343 pci_disable_device(pdev);
1344
1345 return error;
1346}
1347
1348static void __pvscsi_shutdown(struct pvscsi_adapter *adapter)
1349{
1350 pvscsi_mask_intr(adapter);
1351
1352 if (adapter->workqueue)
1353 flush_workqueue(adapter->workqueue);
1354
1355 pvscsi_shutdown_intr(adapter);
1356
1357 pvscsi_process_request_ring(adapter);
1358 pvscsi_process_completion_ring(adapter);
1359 ll_adapter_reset(adapter);
1360}
1361
1362static void pvscsi_shutdown(struct pci_dev *dev)
1363{
1364 struct Scsi_Host *host = pci_get_drvdata(dev);
1365 struct pvscsi_adapter *adapter = shost_priv(host);
1366
1367 __pvscsi_shutdown(adapter);
1368}
1369
1370static void pvscsi_remove(struct pci_dev *pdev)
1371{
1372 struct Scsi_Host *host = pci_get_drvdata(pdev);
1373 struct pvscsi_adapter *adapter = shost_priv(host);
1374
1375 scsi_remove_host(host);
1376
1377 __pvscsi_shutdown(adapter);
1378 pvscsi_release_resources(adapter);
1379
1380 scsi_host_put(host);
1381
1382 pci_set_drvdata(pdev, NULL);
1383 pci_disable_device(pdev);
1384}
1385
1386static struct pci_driver pvscsi_pci_driver = {
1387 .name = "vmw_pvscsi",
1388 .id_table = pvscsi_pci_tbl,
1389 .probe = pvscsi_probe,
1390 .remove = __devexit_p(pvscsi_remove),
1391 .shutdown = pvscsi_shutdown,
1392};
1393
1394static int __init pvscsi_init(void)
1395{
1396 pr_info("%s - version %s\n",
1397 PVSCSI_LINUX_DRIVER_DESC, PVSCSI_DRIVER_VERSION_STRING);
1398 return pci_register_driver(&pvscsi_pci_driver);
1399}
1400
1401static void __exit pvscsi_exit(void)
1402{
1403 pci_unregister_driver(&pvscsi_pci_driver);
1404}
1405
1406module_init(pvscsi_init);
1407module_exit(pvscsi_exit);
diff --git a/drivers/scsi/vmw_pvscsi.h b/drivers/scsi/vmw_pvscsi.h
new file mode 100644
index 000000000000..62e36e75715e
--- /dev/null
+++ b/drivers/scsi/vmw_pvscsi.h
@@ -0,0 +1,397 @@
1/*
2 * VMware PVSCSI header file
3 *
4 * Copyright (C) 2008-2009, VMware, Inc. All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; version 2 of the License and no later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
13 * NON INFRINGEMENT. See the GNU General Public License for more
14 * details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Maintained by: Alok N Kataria <akataria@vmware.com>
21 *
22 */
23
24#ifndef _VMW_PVSCSI_H_
25#define _VMW_PVSCSI_H_
26
27#include <linux/types.h>
28
29#define PVSCSI_DRIVER_VERSION_STRING "1.0.1.0-k"
30
31#define PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT 128
32
33#define MASK(n) ((1 << (n)) - 1) /* make an n-bit mask */
34
35#define PCI_VENDOR_ID_VMWARE 0x15AD
36#define PCI_DEVICE_ID_VMWARE_PVSCSI 0x07C0
37
38/*
39 * host adapter status/error codes
40 */
41enum HostBusAdapterStatus {
42 BTSTAT_SUCCESS = 0x00, /* CCB complete normally with no errors */
43 BTSTAT_LINKED_COMMAND_COMPLETED = 0x0a,
44 BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG = 0x0b,
45 BTSTAT_DATA_UNDERRUN = 0x0c,
46 BTSTAT_SELTIMEO = 0x11, /* SCSI selection timeout */
47 BTSTAT_DATARUN = 0x12, /* data overrun/underrun */
48 BTSTAT_BUSFREE = 0x13, /* unexpected bus free */
49 BTSTAT_INVPHASE = 0x14, /* invalid bus phase or sequence requested by target */
50 BTSTAT_LUNMISMATCH = 0x17, /* linked CCB has different LUN from first CCB */
51 BTSTAT_SENSFAILED = 0x1b, /* auto request sense failed */
52 BTSTAT_TAGREJECT = 0x1c, /* SCSI II tagged queueing message rejected by target */
53 BTSTAT_BADMSG = 0x1d, /* unsupported message received by the host adapter */
54 BTSTAT_HAHARDWARE = 0x20, /* host adapter hardware failed */
55 BTSTAT_NORESPONSE = 0x21, /* target did not respond to SCSI ATN, sent a SCSI RST */
56 BTSTAT_SENTRST = 0x22, /* host adapter asserted a SCSI RST */
57 BTSTAT_RECVRST = 0x23, /* other SCSI devices asserted a SCSI RST */
58 BTSTAT_DISCONNECT = 0x24, /* target device reconnected improperly (w/o tag) */
59 BTSTAT_BUSRESET = 0x25, /* host adapter issued BUS device reset */
60 BTSTAT_ABORTQUEUE = 0x26, /* abort queue generated */
61 BTSTAT_HASOFTWARE = 0x27, /* host adapter software error */
62 BTSTAT_HATIMEOUT = 0x30, /* host adapter hardware timeout error */
63 BTSTAT_SCSIPARITY = 0x34, /* SCSI parity error detected */
64};
65
66/*
67 * Register offsets.
68 *
69 * These registers are accessible both via i/o space and mm i/o.
70 */
71
72enum PVSCSIRegOffset {
73 PVSCSI_REG_OFFSET_COMMAND = 0x0,
74 PVSCSI_REG_OFFSET_COMMAND_DATA = 0x4,
75 PVSCSI_REG_OFFSET_COMMAND_STATUS = 0x8,
76 PVSCSI_REG_OFFSET_LAST_STS_0 = 0x100,
77 PVSCSI_REG_OFFSET_LAST_STS_1 = 0x104,
78 PVSCSI_REG_OFFSET_LAST_STS_2 = 0x108,
79 PVSCSI_REG_OFFSET_LAST_STS_3 = 0x10c,
80 PVSCSI_REG_OFFSET_INTR_STATUS = 0x100c,
81 PVSCSI_REG_OFFSET_INTR_MASK = 0x2010,
82 PVSCSI_REG_OFFSET_KICK_NON_RW_IO = 0x3014,
83 PVSCSI_REG_OFFSET_DEBUG = 0x3018,
84 PVSCSI_REG_OFFSET_KICK_RW_IO = 0x4018,
85};
86
87/*
88 * Virtual h/w commands.
89 */
90
91enum PVSCSICommands {
92 PVSCSI_CMD_FIRST = 0, /* has to be first */
93
94 PVSCSI_CMD_ADAPTER_RESET = 1,
95 PVSCSI_CMD_ISSUE_SCSI = 2,
96 PVSCSI_CMD_SETUP_RINGS = 3,
97 PVSCSI_CMD_RESET_BUS = 4,
98 PVSCSI_CMD_RESET_DEVICE = 5,
99 PVSCSI_CMD_ABORT_CMD = 6,
100 PVSCSI_CMD_CONFIG = 7,
101 PVSCSI_CMD_SETUP_MSG_RING = 8,
102 PVSCSI_CMD_DEVICE_UNPLUG = 9,
103
104 PVSCSI_CMD_LAST = 10 /* has to be last */
105};
106
107/*
108 * Command descriptor for PVSCSI_CMD_RESET_DEVICE --
109 */
110
111struct PVSCSICmdDescResetDevice {
112 u32 target;
113 u8 lun[8];
114} __packed;
115
116/*
117 * Command descriptor for PVSCSI_CMD_ABORT_CMD --
118 *
119 * - currently does not support specifying the LUN.
120 * - _pad should be 0.
121 */
122
123struct PVSCSICmdDescAbortCmd {
124 u64 context;
125 u32 target;
126 u32 _pad;
127} __packed;
128
129/*
130 * Command descriptor for PVSCSI_CMD_SETUP_RINGS --
131 *
132 * Notes:
133 * - reqRingNumPages and cmpRingNumPages need to be power of two.
134 * - reqRingNumPages and cmpRingNumPages need to be different from 0,
135 * - reqRingNumPages and cmpRingNumPages need to be inferior to
136 * PVSCSI_SETUP_RINGS_MAX_NUM_PAGES.
137 */
138
139#define PVSCSI_SETUP_RINGS_MAX_NUM_PAGES 32
140struct PVSCSICmdDescSetupRings {
141 u32 reqRingNumPages;
142 u32 cmpRingNumPages;
143 u64 ringsStatePPN;
144 u64 reqRingPPNs[PVSCSI_SETUP_RINGS_MAX_NUM_PAGES];
145 u64 cmpRingPPNs[PVSCSI_SETUP_RINGS_MAX_NUM_PAGES];
146} __packed;
147
148/*
149 * Command descriptor for PVSCSI_CMD_SETUP_MSG_RING --
150 *
151 * Notes:
152 * - this command was not supported in the initial revision of the h/w
153 * interface. Before using it, you need to check that it is supported by
154 * writing PVSCSI_CMD_SETUP_MSG_RING to the 'command' register, then
155 * immediately after read the 'command status' register:
156 * * a value of -1 means that the cmd is NOT supported,
157 * * a value != -1 means that the cmd IS supported.
158 * If it's supported the 'command status' register should return:
159 * sizeof(PVSCSICmdDescSetupMsgRing) / sizeof(u32).
160 * - this command should be issued _after_ the usual SETUP_RINGS so that the
161 * RingsState page is already setup. If not, the command is a nop.
162 * - numPages needs to be a power of two,
163 * - numPages needs to be different from 0,
164 * - _pad should be zero.
165 */
166
167#define PVSCSI_SETUP_MSG_RING_MAX_NUM_PAGES 16
168
169struct PVSCSICmdDescSetupMsgRing {
170 u32 numPages;
171 u32 _pad;
172 u64 ringPPNs[PVSCSI_SETUP_MSG_RING_MAX_NUM_PAGES];
173} __packed;
174
175enum PVSCSIMsgType {
176 PVSCSI_MSG_DEV_ADDED = 0,
177 PVSCSI_MSG_DEV_REMOVED = 1,
178 PVSCSI_MSG_LAST = 2,
179};
180
181/*
182 * Msg descriptor.
183 *
184 * sizeof(struct PVSCSIRingMsgDesc) == 128.
185 *
186 * - type is of type enum PVSCSIMsgType.
187 * - the content of args depend on the type of event being delivered.
188 */
189
190struct PVSCSIRingMsgDesc {
191 u32 type;
192 u32 args[31];
193} __packed;
194
195struct PVSCSIMsgDescDevStatusChanged {
196 u32 type; /* PVSCSI_MSG_DEV _ADDED / _REMOVED */
197 u32 bus;
198 u32 target;
199 u8 lun[8];
200 u32 pad[27];
201} __packed;
202
203/*
204 * Rings state.
205 *
206 * - the fields:
207 * . msgProdIdx,
208 * . msgConsIdx,
209 * . msgNumEntriesLog2,
210 * .. are only used once the SETUP_MSG_RING cmd has been issued.
211 * - '_pad' helps to ensure that the msg related fields are on their own
212 * cache-line.
213 */
214
215struct PVSCSIRingsState {
216 u32 reqProdIdx;
217 u32 reqConsIdx;
218 u32 reqNumEntriesLog2;
219
220 u32 cmpProdIdx;
221 u32 cmpConsIdx;
222 u32 cmpNumEntriesLog2;
223
224 u8 _pad[104];
225
226 u32 msgProdIdx;
227 u32 msgConsIdx;
228 u32 msgNumEntriesLog2;
229} __packed;
230
231/*
232 * Request descriptor.
233 *
234 * sizeof(RingReqDesc) = 128
235 *
236 * - context: is a unique identifier of a command. It could normally be any
237 * 64bit value, however we currently store it in the serialNumber variable
238 * of struct SCSI_Command, so we have the following restrictions due to the
239 * way this field is handled in the vmkernel storage stack:
240 * * this value can't be 0,
241 * * the upper 32bit need to be 0 since serialNumber is as a u32.
242 * Currently tracked as PR 292060.
243 * - dataLen: contains the total number of bytes that need to be transferred.
244 * - dataAddr:
245 * * if PVSCSI_FLAG_CMD_WITH_SG_LIST is set: dataAddr is the PA of the first
246 * s/g table segment, each s/g segment is entirely contained on a single
247 * page of physical memory,
248 * * if PVSCSI_FLAG_CMD_WITH_SG_LIST is NOT set, then dataAddr is the PA of
249 * the buffer used for the DMA transfer,
250 * - flags:
251 * * PVSCSI_FLAG_CMD_WITH_SG_LIST: see dataAddr above,
252 * * PVSCSI_FLAG_CMD_DIR_NONE: no DMA involved,
253 * * PVSCSI_FLAG_CMD_DIR_TOHOST: transfer from device to main memory,
254 * * PVSCSI_FLAG_CMD_DIR_TODEVICE: transfer from main memory to device,
255 * * PVSCSI_FLAG_CMD_OUT_OF_BAND_CDB: reserved to handle CDBs larger than
256 * 16bytes. To be specified.
257 * - vcpuHint: vcpuId of the processor that will be most likely waiting for the
258 * completion of the i/o. For guest OSes that use lowest priority message
259 * delivery mode (such as windows), we use this "hint" to deliver the
260 * completion action to the proper vcpu. For now, we can use the vcpuId of
261 * the processor that initiated the i/o as a likely candidate for the vcpu
262 * that will be waiting for the completion..
263 * - bus should be 0: we currently only support bus 0 for now.
264 * - unused should be zero'd.
265 */
266
267#define PVSCSI_FLAG_CMD_WITH_SG_LIST (1 << 0)
268#define PVSCSI_FLAG_CMD_OUT_OF_BAND_CDB (1 << 1)
269#define PVSCSI_FLAG_CMD_DIR_NONE (1 << 2)
270#define PVSCSI_FLAG_CMD_DIR_TOHOST (1 << 3)
271#define PVSCSI_FLAG_CMD_DIR_TODEVICE (1 << 4)
272
273struct PVSCSIRingReqDesc {
274 u64 context;
275 u64 dataAddr;
276 u64 dataLen;
277 u64 senseAddr;
278 u32 senseLen;
279 u32 flags;
280 u8 cdb[16];
281 u8 cdbLen;
282 u8 lun[8];
283 u8 tag;
284 u8 bus;
285 u8 target;
286 u8 vcpuHint;
287 u8 unused[59];
288} __packed;
289
290/*
291 * Scatter-gather list management.
292 *
293 * As described above, when PVSCSI_FLAG_CMD_WITH_SG_LIST is set in the
294 * RingReqDesc.flags, then RingReqDesc.dataAddr is the PA of the first s/g
295 * table segment.
296 *
297 * - each segment of the s/g table contain a succession of struct
298 * PVSCSISGElement.
299 * - each segment is entirely contained on a single physical page of memory.
300 * - a "chain" s/g element has the flag PVSCSI_SGE_FLAG_CHAIN_ELEMENT set in
301 * PVSCSISGElement.flags and in this case:
302 * * addr is the PA of the next s/g segment,
303 * * length is undefined, assumed to be 0.
304 */
305
306struct PVSCSISGElement {
307 u64 addr;
308 u32 length;
309 u32 flags;
310} __packed;
311
312/*
313 * Completion descriptor.
314 *
315 * sizeof(RingCmpDesc) = 32
316 *
317 * - context: identifier of the command. The same thing that was specified
318 * under "context" as part of struct RingReqDesc at initiation time,
319 * - dataLen: number of bytes transferred for the actual i/o operation,
320 * - senseLen: number of bytes written into the sense buffer,
321 * - hostStatus: adapter status,
322 * - scsiStatus: device status,
323 * - _pad should be zero.
324 */
325
326struct PVSCSIRingCmpDesc {
327 u64 context;
328 u64 dataLen;
329 u32 senseLen;
330 u16 hostStatus;
331 u16 scsiStatus;
332 u32 _pad[2];
333} __packed;
334
335/*
336 * Interrupt status / IRQ bits.
337 */
338
339#define PVSCSI_INTR_CMPL_0 (1 << 0)
340#define PVSCSI_INTR_CMPL_1 (1 << 1)
341#define PVSCSI_INTR_CMPL_MASK MASK(2)
342
343#define PVSCSI_INTR_MSG_0 (1 << 2)
344#define PVSCSI_INTR_MSG_1 (1 << 3)
345#define PVSCSI_INTR_MSG_MASK (MASK(2) << 2)
346
347#define PVSCSI_INTR_ALL_SUPPORTED MASK(4)
348
349/*
350 * Number of MSI-X vectors supported.
351 */
352#define PVSCSI_MAX_INTRS 24
353
354/*
355 * Enumeration of supported MSI-X vectors
356 */
357#define PVSCSI_VECTOR_COMPLETION 0
358
359/*
360 * Misc constants for the rings.
361 */
362
363#define PVSCSI_MAX_NUM_PAGES_REQ_RING PVSCSI_SETUP_RINGS_MAX_NUM_PAGES
364#define PVSCSI_MAX_NUM_PAGES_CMP_RING PVSCSI_SETUP_RINGS_MAX_NUM_PAGES
365#define PVSCSI_MAX_NUM_PAGES_MSG_RING PVSCSI_SETUP_MSG_RING_MAX_NUM_PAGES
366
367#define PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE \
368 (PAGE_SIZE / sizeof(struct PVSCSIRingReqDesc))
369
370#define PVSCSI_MAX_REQ_QUEUE_DEPTH \
371 (PVSCSI_MAX_NUM_PAGES_REQ_RING * PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE)
372
373#define PVSCSI_MEM_SPACE_COMMAND_NUM_PAGES 1
374#define PVSCSI_MEM_SPACE_INTR_STATUS_NUM_PAGES 1
375#define PVSCSI_MEM_SPACE_MISC_NUM_PAGES 2
376#define PVSCSI_MEM_SPACE_KICK_IO_NUM_PAGES 2
377#define PVSCSI_MEM_SPACE_MSIX_NUM_PAGES 2
378
379enum PVSCSIMemSpace {
380 PVSCSI_MEM_SPACE_COMMAND_PAGE = 0,
381 PVSCSI_MEM_SPACE_INTR_STATUS_PAGE = 1,
382 PVSCSI_MEM_SPACE_MISC_PAGE = 2,
383 PVSCSI_MEM_SPACE_KICK_IO_PAGE = 4,
384 PVSCSI_MEM_SPACE_MSIX_TABLE_PAGE = 6,
385 PVSCSI_MEM_SPACE_MSIX_PBA_PAGE = 7,
386};
387
388#define PVSCSI_MEM_SPACE_NUM_PAGES \
389 (PVSCSI_MEM_SPACE_COMMAND_NUM_PAGES + \
390 PVSCSI_MEM_SPACE_INTR_STATUS_NUM_PAGES + \
391 PVSCSI_MEM_SPACE_MISC_NUM_PAGES + \
392 PVSCSI_MEM_SPACE_KICK_IO_NUM_PAGES + \
393 PVSCSI_MEM_SPACE_MSIX_NUM_PAGES)
394
395#define PVSCSI_MEM_SPACE_SIZE (PVSCSI_MEM_SPACE_NUM_PAGES * PAGE_SIZE)
396
397#endif /* _VMW_PVSCSI_H_ */
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-10 17:55:50 -0500