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  */
53 static void
_warpdrive_disable_ddio(struct MPT3SAS_ADAPTER * ioc)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,
65 	    &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(&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  */
85 u8
mpt3sas_get_num_volumes(struct MPT3SAS_ADAPTER * ioc)86 mpt3sas_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,
96 	    &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  */
113 void
mpt3sas_init_warpdrive_properties(struct MPT3SAS_ADAPTER * ioc,struct _raid_device * raid_device)114 mpt3sas_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, raid_device->handle,
139 	    &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 = offsetof(Mpi2RaidVolPage0_t, PhysDisk) + (num_pds *
145 	    sizeof(Mpi2RaidVol0PhysDisk_t));
146 	vol_pg0 = kzalloc(sz, GFP_KERNEL);
147 	if (!vol_pg0) {
148 		ioc_info(ioc, "WarpDrive : Direct IO is disabled Memory allocation failure for RVPG0\n");
149 		return;
150 	}
151 
152 	if ((mpt3sas_config_get_raid_volume_pg0(ioc, &mpi_reply, vol_pg0,
153 	     MPI2_RAID_VOLUME_PGAD_FORM_HANDLE, raid_device->handle, sz))) {
154 		ioc_info(ioc, "WarpDrive : Direct IO is disabled Failure in retrieving RVPG0\n");
155 		kfree(vol_pg0);
156 		return;
157 	}
158 
159 	/*
160 	 * WARPDRIVE:If number of physical disks in a volume exceeds the max pds
161 	 * assumed for WARPDRIVE, disable direct I/O
162 	 */
163 	if (num_pds > MPT_MAX_WARPDRIVE_PDS) {
164 		ioc_warn(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x): num_mem=%d, max_mem_allowed=%d\n",
165 			 raid_device->handle, num_pds, MPT_MAX_WARPDRIVE_PDS);
166 		kfree(vol_pg0);
167 		return;
168 	}
169 	for (count = 0; count < num_pds; count++) {
170 		if (mpt3sas_config_get_phys_disk_pg0(ioc, &mpi_reply,
171 		    &pd_pg0, MPI2_PHYSDISK_PGAD_FORM_PHYSDISKNUM,
172 		    vol_pg0->PhysDisk[count].PhysDiskNum) ||
173 		    le16_to_cpu(pd_pg0.DevHandle) ==
174 		    MPT3SAS_INVALID_DEVICE_HANDLE) {
175 			ioc_info(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x) member handle retrieval failed for member number=%d\n",
176 				 raid_device->handle,
177 				 vol_pg0->PhysDisk[count].PhysDiskNum);
178 			goto out_error;
179 		}
180 		/* Disable direct I/O if member drive lba exceeds 4 bytes */
181 		dev_max_lba = le64_to_cpu(pd_pg0.DeviceMaxLBA);
182 		if (dev_max_lba >> 32) {
183 			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",
184 				 raid_device->handle,
185 				 le16_to_cpu(pd_pg0.DevHandle),
186 				 (u64)dev_max_lba);
187 			goto out_error;
188 		}
189 
190 		raid_device->pd_handle[count] = le16_to_cpu(pd_pg0.DevHandle);
191 	}
192 
193 	/*
194 	 * Assumption for WD: Direct I/O is not supported if the volume is
195 	 * not RAID0
196 	 */
197 	if (raid_device->volume_type != MPI2_RAID_VOL_TYPE_RAID0) {
198 		ioc_info(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x): type=%d, s_sz=%uK, blk_size=%u\n",
199 			 raid_device->handle, raid_device->volume_type,
200 			 (le32_to_cpu(vol_pg0->StripeSize) *
201 			  le16_to_cpu(vol_pg0->BlockSize)) / 1024,
202 			 le16_to_cpu(vol_pg0->BlockSize));
203 		goto out_error;
204 	}
205 
206 	stripe_sz = le32_to_cpu(vol_pg0->StripeSize);
207 	stripe_exp = find_first_bit(&stripe_sz, 32);
208 	if (stripe_exp == 32) {
209 		ioc_info(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x) invalid stripe sz %uK\n",
210 			 raid_device->handle,
211 			 (le32_to_cpu(vol_pg0->StripeSize) *
212 			  le16_to_cpu(vol_pg0->BlockSize)) / 1024);
213 		goto out_error;
214 	}
215 	raid_device->stripe_exponent = stripe_exp;
216 	block_sz = le16_to_cpu(vol_pg0->BlockSize);
217 	block_exp = find_first_bit(&block_sz, 16);
218 	if (block_exp == 16) {
219 		ioc_info(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x) invalid block sz %u\n",
220 			 raid_device->handle, le16_to_cpu(vol_pg0->BlockSize));
221 		goto out_error;
222 	}
223 	raid_device->block_exponent = block_exp;
224 	raid_device->direct_io_enabled = 1;
225 
226 	ioc_info(ioc, "WarpDrive : Direct IO is Enabled for the drive with handle(0x%04x)\n",
227 		 raid_device->handle);
228 	/*
229 	 * WARPDRIVE: Though the following fields are not used for direct IO,
230 	 * stored for future purpose:
231 	 */
232 	raid_device->max_lba = le64_to_cpu(vol_pg0->MaxLBA);
233 	raid_device->stripe_sz = le32_to_cpu(vol_pg0->StripeSize);
234 	raid_device->block_sz = le16_to_cpu(vol_pg0->BlockSize);
235 
236 
237 	kfree(vol_pg0);
238 	return;
239 
240 out_error:
241 	raid_device->direct_io_enabled = 0;
242 	for (count = 0; count < num_pds; count++)
243 		raid_device->pd_handle[count] = 0;
244 	kfree(vol_pg0);
245 	return;
246 }
247 
248 /**
249  * mpt3sas_setup_direct_io - setup MPI request for WARPDRIVE Direct I/O
250  * @ioc: per adapter object
251  * @scmd: pointer to scsi command object
252  * @raid_device: pointer to raid device data structure
253  * @mpi_request: pointer to the SCSI_IO reqest message frame
254  */
255 void
mpt3sas_setup_direct_io(struct MPT3SAS_ADAPTER * ioc,struct scsi_cmnd * scmd,struct _raid_device * raid_device,Mpi25SCSIIORequest_t * mpi_request)256 mpt3sas_setup_direct_io(struct MPT3SAS_ADAPTER *ioc, struct scsi_cmnd *scmd,
257 	struct _raid_device *raid_device, Mpi25SCSIIORequest_t *mpi_request)
258 {
259 	sector_t v_lba, p_lba, stripe_off, column, io_size;
260 	u32 stripe_sz, stripe_exp;
261 	u8 num_pds, cmd = scmd->cmnd[0];
262 	struct scsiio_tracker *st = scsi_cmd_priv(scmd);
263 
264 	if (cmd != READ_10 && cmd != WRITE_10 &&
265 	    cmd != READ_16 && cmd != WRITE_16)
266 		return;
267 
268 	if (cmd == READ_10 || cmd == WRITE_10)
269 		v_lba = get_unaligned_be32(&mpi_request->CDB.CDB32[2]);
270 	else
271 		v_lba = get_unaligned_be64(&mpi_request->CDB.CDB32[2]);
272 
273 	io_size = scsi_bufflen(scmd) >> raid_device->block_exponent;
274 
275 	if (v_lba + io_size - 1 > raid_device->max_lba)
276 		return;
277 
278 	stripe_sz = raid_device->stripe_sz;
279 	stripe_exp = raid_device->stripe_exponent;
280 	stripe_off = v_lba & (stripe_sz - 1);
281 
282 	/* Return unless IO falls within a stripe */
283 	if (stripe_off + io_size > stripe_sz)
284 		return;
285 
286 	num_pds = raid_device->num_pds;
287 	p_lba = v_lba >> stripe_exp;
288 	column = sector_div(p_lba, num_pds);
289 	p_lba = (p_lba << stripe_exp) + stripe_off;
290 	mpi_request->DevHandle = cpu_to_le16(raid_device->pd_handle[column]);
291 
292 	if (cmd == READ_10 || cmd == WRITE_10)
293 		put_unaligned_be32(lower_32_bits(p_lba),
294 				   &mpi_request->CDB.CDB32[2]);
295 	else
296 		put_unaligned_be64(p_lba, &mpi_request->CDB.CDB32[2]);
297 
298 	st->direct_io = 1;
299 }
300