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crypto: qat - detect PFVF collision after ACK

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[ Upstream commit 9b768e8a3909ac1ab39ed44a3933716da7761a6f ]

Detect a PFVF collision between the local and the remote function by
checking if the message on the PFVF CSR has been overwritten.
This is done after the remote function confirms that the message has
been received, by clearing the interrupt bit, or the maximum number of
attempts (ADF_IOV_MSG_ACK_MAX_RETRY) to check the CSR has been exceeded.

Fixes: ed8ccaef52 ("crypto: qat - Add support for SRIOV")
Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Co-developed-by: Marco Chiappero <marco.chiappero@intel.com>
Signed-off-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>
This commit is contained in:
Giovanni Cabiddu 2021-09-28 12:44:29 +01:00 committed by Greg Kroah-Hartman
parent 1fe4b24419
commit d99fdd13a7
1 changed files with 7 additions and 0 deletions
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7
drivers/crypto/qat/qat_common/adf_pf2vf_msg.c
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@ -150,6 +150,13 @@ static int __adf_iov_putmsg(struct adf_accel_dev *accel_dev, u32 msg, u8 vf_nr)
val = ADF_CSR_RD(pmisc_bar_addr, pf2vf_offset);
} while ((val & int_bit) && (count++ < ADF_IOV_MSG_ACK_MAX_RETRY));
if (val != msg) {
dev_dbg(&GET_DEV(accel_dev),
"Collision - PFVF CSR overwritten by remote function\n");
ret = -EIO;
goto out;
}
if (val & int_bit) {
dev_dbg(&GET_DEV(accel_dev), "ACK not received from remote\n");
val &= ~int_bit;