From c6132f6f2e682c958f7022ecfd8bec35723a1a9d Mon Sep 17 00:00:00 2001 From: Michael Chan Date: Tue, 31 Aug 2021 21:15:23 -0400 Subject: bnxt_en: Fix 64-bit doorbell operation on 32-bit kernels The driver requires 64-bit doorbell writes to be atomic on 32-bit architectures. So we redefined writeq as a new macro with spinlock protection on 32-bit architectures. This created a new warning when we added a new file in a recent patchset. writeq is defined on many 32-bit architectures to do the memory write non-atomically and it generated a new macro redefined warning. This warning was fixed incorrectly in the recent patch. Fix this properly by adding a new bnxt_writeq() function that will do the non-atomic write under spinlock on 32-bit systems. All callers in the driver will now call bnxt_writeq() instead. v2: Need to pass in bp to bnxt_writeq() Use lo_hi_writeq() [suggested by Florian] Reported-by: kernel test robot Fixes: f9ff578251dc ("bnxt_en: introduce new firmware message API based on DMA pools") Reviewed-by: Edwin Peer Signed-off-by: Michael Chan Reviewed-by: Florian Fainelli Signed-off-by: David S. Miller --- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 14 +++++++----- drivers/net/ethernet/broadcom/bnxt/bnxt.h | 37 +++++++++++++++++++++---------- 2 files changed, 33 insertions(+), 18 deletions(-) (limited to 'drivers/net/ethernet') diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c index 627f85ee3922..acaf1e0f049e 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -305,13 +305,15 @@ static bool bnxt_vf_pciid(enum board_idx idx) writel(DB_CP_FLAGS | RING_CMP(idx), (db)->doorbell) #define BNXT_DB_NQ_P5(db, idx) \ - writeq((db)->db_key64 | DBR_TYPE_NQ | RING_CMP(idx), (db)->doorbell) + bnxt_writeq(bp, (db)->db_key64 | DBR_TYPE_NQ | RING_CMP(idx), \ + (db)->doorbell) #define BNXT_DB_CQ_ARM(db, idx) \ writel(DB_CP_REARM_FLAGS | RING_CMP(idx), (db)->doorbell) #define BNXT_DB_NQ_ARM_P5(db, idx) \ - writeq((db)->db_key64 | DBR_TYPE_NQ_ARM | RING_CMP(idx), (db)->doorbell) + bnxt_writeq(bp, (db)->db_key64 | DBR_TYPE_NQ_ARM | RING_CMP(idx),\ + (db)->doorbell) static void bnxt_db_nq(struct bnxt *bp, struct bnxt_db_info *db, u32 idx) { @@ -332,8 +334,8 @@ static void bnxt_db_nq_arm(struct bnxt *bp, struct bnxt_db_info *db, u32 idx) static void bnxt_db_cq(struct bnxt *bp, struct bnxt_db_info *db, u32 idx) { if (bp->flags & BNXT_FLAG_CHIP_P5) - writeq(db->db_key64 | DBR_TYPE_CQ_ARMALL | RING_CMP(idx), - db->doorbell); + bnxt_writeq(bp, db->db_key64 | DBR_TYPE_CQ_ARMALL | + RING_CMP(idx), db->doorbell); else BNXT_DB_CQ(db, idx); } @@ -2638,8 +2640,8 @@ static void __bnxt_poll_cqs_done(struct bnxt *bp, struct bnxt_napi *bnapi, if (cpr2 && cpr2->had_work_done) { db = &cpr2->cp_db; - writeq(db->db_key64 | dbr_type | - RING_CMP(cpr2->cp_raw_cons), db->doorbell); + bnxt_writeq(bp, db->db_key64 | dbr_type | + RING_CMP(cpr2->cp_raw_cons), db->doorbell); cpr2->had_work_done = 0; } } diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h index a8212dcdad5f..ec046e7a2484 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h @@ -28,6 +28,7 @@ #include #include #include +#include #ifdef CONFIG_TEE_BNXT_FW #include #endif @@ -1981,7 +1982,7 @@ struct bnxt { struct mutex sriov_lock; #endif -#ifndef writeq +#if BITS_PER_LONG == 32 /* ensure atomic 64-bit doorbell writes on 32-bit systems. */ spinlock_t db_lock; #endif @@ -2110,24 +2111,36 @@ static inline u32 bnxt_tx_avail(struct bnxt *bp, struct bnxt_tx_ring_info *txr) ((txr->tx_prod - txr->tx_cons) & bp->tx_ring_mask); } -#ifndef writeq -#define writeq(val64, db) \ -do { \ - spin_lock(&bp->db_lock); \ - writel((val64) & 0xffffffff, db); \ - writel((val64) >> 32, (db) + 4); \ - spin_unlock(&bp->db_lock); \ -} while (0) +static inline void bnxt_writeq(struct bnxt *bp, u64 val, + volatile void __iomem *addr) +{ +#if BITS_PER_LONG == 32 + spin_lock(&bp->db_lock); + lo_hi_writeq(val, addr); + spin_unlock(&bp->db_lock); +#else + writeq(val, addr); +#endif +} -#define writeq_relaxed writeq +static inline void bnxt_writeq_relaxed(struct bnxt *bp, u64 val, + volatile void __iomem *addr) +{ +#if BITS_PER_LONG == 32 + spin_lock(&bp->db_lock); + lo_hi_writeq_relaxed(val, addr); + spin_unlock(&bp->db_lock); +#else + writeq_relaxed(val, addr); #endif +} /* For TX and RX ring doorbells with no ordering guarantee*/ static inline void bnxt_db_write_relaxed(struct bnxt *bp, struct bnxt_db_info *db, u32 idx) { if (bp->flags & BNXT_FLAG_CHIP_P5) { - writeq_relaxed(db->db_key64 | idx, db->doorbell); + bnxt_writeq_relaxed(bp, db->db_key64 | idx, db->doorbell); } else { u32 db_val = db->db_key32 | idx; @@ -2142,7 +2155,7 @@ static inline void bnxt_db_write(struct bnxt *bp, struct bnxt_db_info *db, u32 idx) { if (bp->flags & BNXT_FLAG_CHIP_P5) { - writeq(db->db_key64 | idx, db->doorbell); + bnxt_writeq(bp, db->db_key64 | idx, db->doorbell); } else { u32 db_val = db->db_key32 | idx; -- cgit v1.2.3