From: Geetha sowjanya Date: Wed, 3 May 2023 07:09:34 +0000 (+0530) Subject: octeontx2-af: Secure APR table update with the lock X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=048486f81d01db4d100af021ee2ea211d19732a0;p=linux.git octeontx2-af: Secure APR table update with the lock APR table contains the lmtst base address of PF/VFs. These entries are updated by the PF/VF during the device probe. The lmtst address is fetched from HW using "TXN_REQ" and "ADDR_RSP_STS" registers. The lock tries to protect these registers from getting overwritten when multiple PFs invokes rvu_get_lmtaddr() simultaneously. For example, if PF1 submit the request and got permitted before it reads the response and PF2 got scheduled submit the request then the response of PF1 is overwritten by the PF2 response. Fixes: 893ae97214c3 ("octeontx2-af: cn10k: Support configurable LMTST regions") Signed-off-by: Geetha sowjanya Signed-off-by: Sunil Kovvuri Goutham Signed-off-by: Sai Krishna Reviewed-by: Simon Horman Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_cn10k.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_cn10k.c index 4ad9ff025c964..0e74c5a2231e6 100644 --- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_cn10k.c +++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_cn10k.c @@ -60,13 +60,14 @@ static int rvu_get_lmtaddr(struct rvu *rvu, u16 pcifunc, u64 iova, u64 *lmt_addr) { u64 pa, val, pf; - int err; + int err = 0; if (!iova) { dev_err(rvu->dev, "%s Requested Null address for transulation\n", __func__); return -EINVAL; } + mutex_lock(&rvu->rsrc_lock); rvu_write64(rvu, BLKADDR_RVUM, RVU_AF_SMMU_ADDR_REQ, iova); pf = rvu_get_pf(pcifunc) & 0x1F; val = BIT_ULL(63) | BIT_ULL(14) | BIT_ULL(13) | pf << 8 | @@ -76,12 +77,13 @@ static int rvu_get_lmtaddr(struct rvu *rvu, u16 pcifunc, err = rvu_poll_reg(rvu, BLKADDR_RVUM, RVU_AF_SMMU_ADDR_RSP_STS, BIT_ULL(0), false); if (err) { dev_err(rvu->dev, "%s LMTLINE iova transulation failed\n", __func__); - return err; + goto exit; } val = rvu_read64(rvu, BLKADDR_RVUM, RVU_AF_SMMU_ADDR_RSP_STS); if (val & ~0x1ULL) { dev_err(rvu->dev, "%s LMTLINE iova transulation failed err:%llx\n", __func__, val); - return -EIO; + err = -EIO; + goto exit; } /* PA[51:12] = RVU_AF_SMMU_TLN_FLIT0[57:18] * PA[11:0] = IOVA[11:0] @@ -89,8 +91,9 @@ static int rvu_get_lmtaddr(struct rvu *rvu, u16 pcifunc, pa = rvu_read64(rvu, BLKADDR_RVUM, RVU_AF_SMMU_TLN_FLIT0) >> 18; pa &= GENMASK_ULL(39, 0); *lmt_addr = (pa << 12) | (iova & 0xFFF); - - return 0; +exit: + mutex_unlock(&rvu->rsrc_lock); + return err; } static int rvu_update_lmtaddr(struct rvu *rvu, u16 pcifunc, u64 lmt_addr)