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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb 
 kernel/drivers/crypto/qat/qat_common/adf_pf2vf_msg.c
....@@ -1,50 +1,5 @@
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-/*
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-  This file is provided under a dual BSD/GPLv2 license.  When using or
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-  redistributing this file, you may do so under either license.
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-
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-  GPL LICENSE SUMMARY
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-  Copyright(c) 2015 Intel Corporation.
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-  This program is free software; you can redistribute it and/or modify
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-  it under the terms of version 2 of the GNU General Public License as
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-  published by the Free Software Foundation.
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-
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-  This program is distributed in the hope that it will be useful, but
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-  WITHOUT ANY WARRANTY; without even the implied warranty of
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-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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-  General Public License for more details.
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-
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-  Contact Information:
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-  qat-linux@intel.com
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-
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-  BSD LICENSE
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-  Copyright(c) 2015 Intel Corporation.
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-  Redistribution and use in source and binary forms, with or without
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-  modification, are permitted provided that the following conditions
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-  are met:
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-
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-    * Redistributions of source code must retain the above copyright
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-      notice, this list of conditions and the following disclaimer.
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-    * Redistributions in binary form must reproduce the above copyright
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-      notice, this list of conditions and the following disclaimer in
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-      the documentation and/or other materials provided with the
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-      distribution.
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-    * Neither the name of Intel Corporation nor the names of its
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-      contributors may be used to endorse or promote products derived
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-      from this software without specific prior written permission.
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-
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-  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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-  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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-  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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-  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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-  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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-  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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-  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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-  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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-  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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-  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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-  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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-*/
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-
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+// SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0-only)
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+/* Copyright(c) 2015 - 2020 Intel Corporation */
483 #include <linux/delay.h>
494 #include "adf_accel_devices.h"
505 #include "adf_common_drv.h"
....@@ -156,37 +111,19 @@
156111 
157112 	mutex_lock(lock);
158113 
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-	/* Check if PF2VF CSR is in use by remote function */
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+	/* Check if the PFVF CSR is in use by remote function */
160115 	val = ADF_CSR_RD(pmisc_bar_addr, pf2vf_offset);
161116 	if ((val & remote_in_use_mask) == remote_in_use_pattern) {
162117 		dev_dbg(&GET_DEV(accel_dev),
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-			"PF2VF CSR in use by remote function\n");
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+			"PFVF CSR in use by remote function\n");
164119 		ret = -EBUSY;
165120 		goto out;
166121 	}
167122 
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-	/* Attempt to get ownership of PF2VF CSR */
169123 	msg &= ~local_in_use_mask;
170124 	msg |= local_in_use_pattern;
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-	ADF_CSR_WR(pmisc_bar_addr, pf2vf_offset, msg);
172125 
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-	/* Wait in case remote func also attempting to get ownership */
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-	msleep(ADF_IOV_MSG_COLLISION_DETECT_DELAY);
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-
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-	val = ADF_CSR_RD(pmisc_bar_addr, pf2vf_offset);
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-	if ((val & local_in_use_mask) != local_in_use_pattern) {
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-		dev_dbg(&GET_DEV(accel_dev),
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-			"PF2VF CSR in use by remote - collision detected\n");
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-		ret = -EBUSY;
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-		goto out;
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-	}
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-
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-	/*
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-	 * This function now owns the PV2VF CSR.  The IN_USE_BY pattern must
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-	 * remain in the PF2VF CSR for all writes including ACK from remote
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-	 * until this local function relinquishes the CSR.  Send the message
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-	 * by interrupting the remote.
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-	 */
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+	/* Attempt to get ownership of the PFVF CSR */
190127 	ADF_CSR_WR(pmisc_bar_addr, pf2vf_offset, msg | int_bit);
191128 
192129 	/* Wait for confirmation from remote func it received the message */
....@@ -195,6 +132,12 @@
195132 		val = ADF_CSR_RD(pmisc_bar_addr, pf2vf_offset);
196133 	} while ((val & int_bit) && (count++ < ADF_IOV_MSG_ACK_MAX_RETRY));
197134 
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+	if (val & int_bit) {
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+		dev_dbg(&GET_DEV(accel_dev), "ACK not received from remote\n");
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+		val &= ~int_bit;
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+		ret = -EIO;
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+	}
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+
198141 	if (val != msg) {
199142 		dev_dbg(&GET_DEV(accel_dev),
200143 			"Collision - PFVF CSR overwritten by remote function\n");
....@@ -202,13 +145,7 @@
202145 		goto out;
203146 	}
204147 
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-	if (val & int_bit) {
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-		dev_dbg(&GET_DEV(accel_dev), "ACK not received from remote\n");
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-		val &= ~int_bit;
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-		ret = -EIO;
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-	}
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-
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-	/* Finished with PF2VF CSR; relinquish it and leave msg in CSR */
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+	/* Finished with the PFVF CSR; relinquish it and leave msg in CSR */
212149 	ADF_CSR_WR(pmisc_bar_addr, pf2vf_offset, val & ~local_in_use_mask);
213150 out:
214151 	mutex_unlock(lock);
....@@ -216,12 +153,13 @@
216153 }
217154 
218155 /**
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- * adf_iov_putmsg() - send PF2VF message
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+ * adf_iov_putmsg() - send PFVF message
220157  * @accel_dev:  Pointer to acceleration device.
221158  * @msg:	Message to send
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- * @vf_nr:	VF number to which the message will be sent
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+ * @vf_nr:	VF number to which the message will be sent if on PF, ignored
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+ *		otherwise
223161  *
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- * Function sends a messge from the PF to a VF
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+ * Function sends a message through the PFVF channel
225163  *
226164  * Return: 0 on success, error code otherwise.
227165  */
....@@ -399,7 +337,7 @@
399337 		/* VF is newer than PF and decides whether it is compatible */
400338 		if (accel_dev->vf.pf_version >= hw_data->min_iov_compat_ver)
401339 			break;
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-		/* fall through */
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+		fallthrough;
403341 	case ADF_PF2VF_VF_INCOMPATIBLE:
404342 		dev_err(&GET_DEV(accel_dev),
405343 			"PF (vers %d) and VF (vers %d) are not compatible\n",