crypto: qat - disregard spurious PFVF interrupts

stable inclusion
from stable-5.10.80
commit 8d98683fa6df1edd86183250958a55899f4a689c
bugzilla: 185821 https://gitee.com/openeuler/kernel/issues/I4L7CG

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=8d98683fa6df1edd86183250958a55899f4a689c

--------------------------------

[ Upstream commit 18fcba46 ]

Upon receiving a PFVF message, check if the interrupt bit is set in the
message. If it is not, that means that the interrupt was probably
triggered by a collision. In this case, disregard the message and
re-enable the interrupts.

Fixes: ed8ccaef ("crypto: qat - Add support for SRIOV")
Signed-off-by: NGiovanni Cabiddu <giovanni.cabiddu@intel.com>
Reviewed-by: NMarco Chiappero <marco.chiappero@intel.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Reviewed-by: NWeilong Chen <chenweilong@huawei.com>
Acked-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/crypto/qat/qat_common/adf_pf2vf_msg.c

@@ -205,6 +205,11 @@ void adf_vf2pf_req_hndl(struct adf_accel_vf_info *vf_info)
 
 	/* Read message from the VF */
 	msg = ADF_CSR_RD(pmisc_addr, hw_data->get_pf2vf_offset(vf_nr));
+	if (!(msg & ADF_VF2PF_INT)) {
+		dev_info(&GET_DEV(accel_dev),
+			 "Spurious VF2PF interrupt, msg %X. Ignored\n", msg);
+		goto out;
+	}
 
 	/* To ACK, clear the VF2PFINT bit */
 	msg &= ~ADF_VF2PF_INT;
@@ -288,6 +293,7 @@ void adf_vf2pf_req_hndl(struct adf_accel_vf_info *vf_info)
 	if (resp && adf_iov_putmsg(accel_dev, resp, vf_nr))
 		dev_err(&GET_DEV(accel_dev), "Failed to send response to VF\n");
 
+out:
 	/* re-enable interrupt on PF from this VF */
 	adf_enable_vf2pf_interrupts(accel_dev, (1 << vf_nr));
 	return;

drivers/crypto/qat/qat_common/adf_vf_isr.c

@@ -79,6 +79,11 @@ static void adf_pf2vf_bh_handler(void *data)
 
 	/* Read the message from PF */
 	msg = ADF_CSR_RD(pmisc_bar_addr, hw_data->get_pf2vf_offset(0));
+	if (!(msg & ADF_PF2VF_INT)) {
+		dev_info(&GET_DEV(accel_dev),
+			 "Spurious PF2VF interrupt, msg %X. Ignored\n", msg);
+		goto out;
+	}
 
 	if (!(msg & ADF_PF2VF_MSGORIGIN_SYSTEM))
 		/* Ignore legacy non-system (non-kernel) PF2VF messages */
@@ -127,6 +132,7 @@ static void adf_pf2vf_bh_handler(void *data)
 	msg &= ~ADF_PF2VF_INT;
 	ADF_CSR_WR(pmisc_bar_addr, hw_data->get_pf2vf_offset(0), msg);
 
+out:
 	/* Re-enable PF2VF interrupts */
 	adf_enable_pf2vf_interrupts(accel_dev);
 	return;