1/*
2 * Scsi Host Layer for MPT (Message Passing Technology) based controllers
3 *
4 * Copyright (C) 2012-2014 LSI Corporation
5 * Copyright (C) 2013-2015 Avago Technologies
6 * (mailto: MPT-FusionLinux.pdl@avagotech.com)
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * NO WARRANTY
19 * THE PROGRAM IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR
20 * CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT
21 * LIMITATION, ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT,
22 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Each Recipient is
23 * solely responsible for determining the appropriateness of using and
24 * distributing the Program and assumes all risks associated with its
25 * exercise of rights under this Agreement, including but not limited to
26 * the risks and costs of program errors, damage to or loss of data,
27 * programs or equipment, and unavailability or interruption of operations.
28
29 * DISCLAIMER OF LIABILITY
30 * NEITHER RECIPIENT NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY
31 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), HOWEVER CAUSED AND
33 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
34 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
35 * USE OR DISTRIBUTION OF THE PROGRAM OR THE EXERCISE OF ANY RIGHTS GRANTED
36 * HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES
37
38 * You should have received a copy of the GNU General Public License
39 * along with this program.
40 */
41#include <linux/kernel.h>
42#include <linux/module.h>
43#include <linux/errno.h>
44#include <linux/types.h>
45#include <asm/unaligned.h>
46
47#include "mpt3sas_base.h"
48
49/**
50 * _warpdrive_disable_ddio - Disable direct I/O for all the volumes
51 * @ioc: per adapter object
52 */
53static void
54_warpdrive_disable_ddio(struct MPT3SAS_ADAPTER *ioc)
55{
56 Mpi2RaidVolPage1_t vol_pg1;
57 Mpi2ConfigReply_t mpi_reply;
58 struct _raid_device *raid_device;
59 u16 handle;
60 u16 ioc_status;
61 unsigned long flags;
62
63 handle = 0xFFFF;
64 while (!(mpt3sas_config_get_raid_volume_pg1(ioc, mpi_reply: &mpi_reply,
65 config_page: &vol_pg1, MPI2_RAID_VOLUME_PGAD_FORM_GET_NEXT_HANDLE, handle))) {
66 ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
67 MPI2_IOCSTATUS_MASK;
68 if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
69 break;
70 handle = le16_to_cpu(vol_pg1.DevHandle);
71 spin_lock_irqsave(&ioc->raid_device_lock, flags);
72 raid_device = mpt3sas_raid_device_find_by_handle(ioc, handle);
73 if (raid_device)
74 raid_device->direct_io_enabled = 0;
75 spin_unlock_irqrestore(lock: &ioc->raid_device_lock, flags);
76 }
77 return;
78}
79
80
81/**
82 * mpt3sas_get_num_volumes - Get number of volumes in the ioc
83 * @ioc: per adapter object
84 */
85u8
86mpt3sas_get_num_volumes(struct MPT3SAS_ADAPTER *ioc)
87{
88 Mpi2RaidVolPage1_t vol_pg1;
89 Mpi2ConfigReply_t mpi_reply;
90 u16 handle;
91 u8 vol_cnt = 0;
92 u16 ioc_status;
93
94 handle = 0xFFFF;
95 while (!(mpt3sas_config_get_raid_volume_pg1(ioc, mpi_reply: &mpi_reply,
96 config_page: &vol_pg1, MPI2_RAID_VOLUME_PGAD_FORM_GET_NEXT_HANDLE, handle))) {
97 ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
98 MPI2_IOCSTATUS_MASK;
99 if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
100 break;
101 vol_cnt++;
102 handle = le16_to_cpu(vol_pg1.DevHandle);
103 }
104 return vol_cnt;
105}
106
107
108/**
109 * mpt3sas_init_warpdrive_properties - Set properties for warpdrive direct I/O.
110 * @ioc: per adapter object
111 * @raid_device: the raid_device object
112 */
113void
114mpt3sas_init_warpdrive_properties(struct MPT3SAS_ADAPTER *ioc,
115 struct _raid_device *raid_device)
116{
117 Mpi2RaidVolPage0_t *vol_pg0;
118 Mpi2RaidPhysDiskPage0_t pd_pg0;
119 Mpi2ConfigReply_t mpi_reply;
120 u16 sz;
121 u8 num_pds, count;
122 unsigned long stripe_sz, block_sz;
123 u8 stripe_exp, block_exp;
124 u64 dev_max_lba;
125
126 if (!ioc->is_warpdrive)
127 return;
128
129 if (ioc->mfg_pg10_hide_flag == MFG_PAGE10_EXPOSE_ALL_DISKS) {
130 ioc_info(ioc, "WarpDrive : Direct IO is disabled globally as drives are exposed\n");
131 return;
132 }
133 if (mpt3sas_get_num_volumes(ioc) > 1) {
134 _warpdrive_disable_ddio(ioc);
135 ioc_info(ioc, "WarpDrive : Direct IO is disabled globally as number of drives > 1\n");
136 return;
137 }
138 if ((mpt3sas_config_get_number_pds(ioc, handle: raid_device->handle,
139 num_pds: &num_pds)) || !num_pds) {
140 ioc_info(ioc, "WarpDrive : Direct IO is disabled Failure in computing number of drives\n");
141 return;
142 }
143
144 sz = struct_size(vol_pg0, PhysDisk, num_pds);
145 vol_pg0 = kzalloc(size: sz, GFP_KERNEL);
146 if (!vol_pg0) {
147 ioc_info(ioc, "WarpDrive : Direct IO is disabled Memory allocation failure for RVPG0\n");
148 return;
149 }
150
151 if ((mpt3sas_config_get_raid_volume_pg0(ioc, mpi_reply: &mpi_reply, config_page: vol_pg0,
152 MPI2_RAID_VOLUME_PGAD_FORM_HANDLE, handle: raid_device->handle, sz))) {
153 ioc_info(ioc, "WarpDrive : Direct IO is disabled Failure in retrieving RVPG0\n");
154 kfree(objp: vol_pg0);
155 return;
156 }
157
158 /*
159 * WARPDRIVE:If number of physical disks in a volume exceeds the max pds
160 * assumed for WARPDRIVE, disable direct I/O
161 */
162 if (num_pds > MPT_MAX_WARPDRIVE_PDS) {
163 ioc_warn(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x): num_mem=%d, max_mem_allowed=%d\n",
164 raid_device->handle, num_pds, MPT_MAX_WARPDRIVE_PDS);
165 kfree(objp: vol_pg0);
166 return;
167 }
168 for (count = 0; count < num_pds; count++) {
169 if (mpt3sas_config_get_phys_disk_pg0(ioc, mpi_reply: &mpi_reply,
170 config_page: &pd_pg0, MPI2_PHYSDISK_PGAD_FORM_PHYSDISKNUM,
171 form_specific: vol_pg0->PhysDisk[count].PhysDiskNum) ||
172 le16_to_cpu(pd_pg0.DevHandle) ==
173 MPT3SAS_INVALID_DEVICE_HANDLE) {
174 ioc_info(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x) member handle retrieval failed for member number=%d\n",
175 raid_device->handle,
176 vol_pg0->PhysDisk[count].PhysDiskNum);
177 goto out_error;
178 }
179 /* Disable direct I/O if member drive lba exceeds 4 bytes */
180 dev_max_lba = le64_to_cpu(pd_pg0.DeviceMaxLBA);
181 if (dev_max_lba >> 32) {
182 ioc_info(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x) member handle (0x%04x) unsupported max lba 0x%016llx\n",
183 raid_device->handle,
184 le16_to_cpu(pd_pg0.DevHandle),
185 (u64)dev_max_lba);
186 goto out_error;
187 }
188
189 raid_device->pd_handle[count] = le16_to_cpu(pd_pg0.DevHandle);
190 }
191
192 /*
193 * Assumption for WD: Direct I/O is not supported if the volume is
194 * not RAID0
195 */
196 if (raid_device->volume_type != MPI2_RAID_VOL_TYPE_RAID0) {
197 ioc_info(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x): type=%d, s_sz=%uK, blk_size=%u\n",
198 raid_device->handle, raid_device->volume_type,
199 (le32_to_cpu(vol_pg0->StripeSize) *
200 le16_to_cpu(vol_pg0->BlockSize)) / 1024,
201 le16_to_cpu(vol_pg0->BlockSize));
202 goto out_error;
203 }
204
205 stripe_sz = le32_to_cpu(vol_pg0->StripeSize);
206 stripe_exp = find_first_bit(addr: &stripe_sz, size: 32);
207 if (stripe_exp == 32) {
208 ioc_info(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x) invalid stripe sz %uK\n",
209 raid_device->handle,
210 (le32_to_cpu(vol_pg0->StripeSize) *
211 le16_to_cpu(vol_pg0->BlockSize)) / 1024);
212 goto out_error;
213 }
214 raid_device->stripe_exponent = stripe_exp;
215 block_sz = le16_to_cpu(vol_pg0->BlockSize);
216 block_exp = find_first_bit(addr: &block_sz, size: 16);
217 if (block_exp == 16) {
218 ioc_info(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x) invalid block sz %u\n",
219 raid_device->handle, le16_to_cpu(vol_pg0->BlockSize));
220 goto out_error;
221 }
222 raid_device->block_exponent = block_exp;
223 raid_device->direct_io_enabled = 1;
224
225 ioc_info(ioc, "WarpDrive : Direct IO is Enabled for the drive with handle(0x%04x)\n",
226 raid_device->handle);
227 /*
228 * WARPDRIVE: Though the following fields are not used for direct IO,
229 * stored for future purpose:
230 */
231 raid_device->max_lba = le64_to_cpu(vol_pg0->MaxLBA);
232 raid_device->stripe_sz = le32_to_cpu(vol_pg0->StripeSize);
233 raid_device->block_sz = le16_to_cpu(vol_pg0->BlockSize);
234
235
236 kfree(objp: vol_pg0);
237 return;
238
239out_error:
240 raid_device->direct_io_enabled = 0;
241 for (count = 0; count < num_pds; count++)
242 raid_device->pd_handle[count] = 0;
243 kfree(objp: vol_pg0);
244 return;
245}
246
247/**
248 * mpt3sas_setup_direct_io - setup MPI request for WARPDRIVE Direct I/O
249 * @ioc: per adapter object
250 * @scmd: pointer to scsi command object
251 * @raid_device: pointer to raid device data structure
252 * @mpi_request: pointer to the SCSI_IO reqest message frame
253 */
254void
255mpt3sas_setup_direct_io(struct MPT3SAS_ADAPTER *ioc, struct scsi_cmnd *scmd,
256 struct _raid_device *raid_device, Mpi25SCSIIORequest_t *mpi_request)
257{
258 sector_t v_lba, p_lba, stripe_off, column, io_size;
259 u32 stripe_sz, stripe_exp;
260 u8 num_pds, cmd = scmd->cmnd[0];
261 struct scsiio_tracker *st = scsi_cmd_priv(cmd: scmd);
262
263 if (cmd != READ_10 && cmd != WRITE_10 &&
264 cmd != READ_16 && cmd != WRITE_16)
265 return;
266
267 if (cmd == READ_10 || cmd == WRITE_10)
268 v_lba = get_unaligned_be32(p: &mpi_request->CDB.CDB32[2]);
269 else
270 v_lba = get_unaligned_be64(p: &mpi_request->CDB.CDB32[2]);
271
272 io_size = scsi_bufflen(cmd: scmd) >> raid_device->block_exponent;
273
274 if (v_lba + io_size - 1 > raid_device->max_lba)
275 return;
276
277 stripe_sz = raid_device->stripe_sz;
278 stripe_exp = raid_device->stripe_exponent;
279 stripe_off = v_lba & (stripe_sz - 1);
280
281 /* Return unless IO falls within a stripe */
282 if (stripe_off + io_size > stripe_sz)
283 return;
284
285 num_pds = raid_device->num_pds;
286 p_lba = v_lba >> stripe_exp;
287 column = sector_div(p_lba, num_pds);
288 p_lba = (p_lba << stripe_exp) + stripe_off;
289 mpi_request->DevHandle = cpu_to_le16(raid_device->pd_handle[column]);
290
291 if (cmd == READ_10 || cmd == WRITE_10)
292 put_unaligned_be32(lower_32_bits(p_lba),
293 p: &mpi_request->CDB.CDB32[2]);
294 else
295 put_unaligned_be64(val: p_lba, p: &mpi_request->CDB.CDB32[2]);
296
297 st->direct_io = 1;
298}
299

source code of linux/drivers/scsi/mpt3sas/mpt3sas_warpdrive.c