[PATCH 4.9 095/207] crypto: qat - disregard spurious PFVF interrupts

Greg Kroah-Hartman
2021-11-24T12:27:58Z

From: Giovanni Cabiddu <giovanni.cabiddu@intel.com>

[ Upstream commit 18fcba469ba5359c1de7e3fb16f7b9e8cd1b8e02 ]

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: ed8ccaef52fa ("crypto: qat - Add support for SRIOV")
Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Reviewed-by: Marco Chiappero <marco.chiappero@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/crypto/qat/qat_common/adf_pf2vf_msg.c | 6 ++++++
drivers/crypto/qat/qat_common/adf_vf_isr.c | 6 ++++++
2 files changed, 12 insertions(+)

diff --git a/drivers/crypto/qat/qat_common/adf_pf2vf_msg.c b/drivers/crypto/qat/qat_common/adf_pf2vf_msg.c
index 72fd2bbbe704e..180016e157771 100644
--- a/drivers/crypto/qat/qat_common/adf_pf2vf_msg.c
+++ b/drivers/crypto/qat/qat_common/adf_pf2vf_msg.c
@@ -250,6 +250,11 @@ 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;
@@ -333,6 +338,7 @@ 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;
diff --git a/drivers/crypto/qat/qat_common/adf_vf_isr.c b/drivers/crypto/qat/qat_common/adf_vf_isr.c
index 36db3c443e7e4..6fa1447d05829 100644
--- a/drivers/crypto/qat/qat_common/adf_vf_isr.c
+++ b/drivers/crypto/qat/qat_common/adf_vf_isr.c
@@ -123,6 +123,11 @@ 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 */
@@ -171,6 +176,7 @@ static void adf_pf2vf_bh_handler(void *data)
msg &= ~BIT(0);
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;
--
2.33.0