[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-ID: <20241106213203.3997563-1-vadfed@meta.com>
Date: Wed, 6 Nov 2024 13:32:03 -0800
From: Vadim Fedorenko <vadfed@...a.com>
To: Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
Michael Chan
<michael.chan@...adcom.com>,
Pavan Chebbi <pavan.chebbi@...adcom.com>,
"Jakub
Kicinski" <kuba@...nel.org>
CC: Andrew Lunn <andrew+netdev@...n.ch>, Paolo Abeni <pabeni@...hat.com>,
"David S. Miller" <davem@...emloft.net>, <netdev@...r.kernel.org>,
"Richard
Cochran" <richardcochran@...il.com>,
Vadim Fedorenko <vadfed@...a.com>
Subject: [PATCH net-next] bnxt_en: add unlocked version of bnxt_refclk_read
Serialization of PHC read with FW reset mechanism uses ptp_lock which
also protects timecounter updates. This means we cannot grab it when
called from bnxt_cc_read(). Let's move locking into different function.
Fixes: 6c0828d00f07 ("bnxt_en: replace PTP spinlock with seqlock")
Signed-off-by: Vadim Fedorenko <vadfed@...a.com>
---
drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c | 29 ++++++++++++-------
1 file changed, 19 insertions(+), 10 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
index f74afdab4f7d..5395f125b601 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
@@ -73,19 +73,15 @@ static int bnxt_ptp_settime(struct ptp_clock_info *ptp_info,
return 0;
}
-static int bnxt_refclk_read(struct bnxt *bp, struct ptp_system_timestamp *sts,
- u64 *ns)
+/* Caller holds ptp_lock */
+static int __bnxt_refclk_read(struct bnxt *bp, struct ptp_system_timestamp *sts,
+ u64 *ns)
{
struct bnxt_ptp_cfg *ptp = bp->ptp_cfg;
u32 high_before, high_now, low;
- unsigned long flags;
- /* We have to serialize reg access and FW reset */
- read_seqlock_excl_irqsave(&ptp->ptp_lock, flags);
- if (test_bit(BNXT_STATE_IN_FW_RESET, &bp->state)) {
- read_sequnlock_excl_irqrestore(&ptp->ptp_lock, flags);
+ if (test_bit(BNXT_STATE_IN_FW_RESET, &bp->state))
return -EIO;
- }
high_before = readl(bp->bar0 + ptp->refclk_mapped_regs[1]);
ptp_read_system_prets(sts);
@@ -97,12 +93,25 @@ static int bnxt_refclk_read(struct bnxt *bp, struct ptp_system_timestamp *sts,
low = readl(bp->bar0 + ptp->refclk_mapped_regs[0]);
ptp_read_system_postts(sts);
}
- read_sequnlock_excl_irqrestore(&ptp->ptp_lock, flags);
*ns = ((u64)high_now << 32) | low;
return 0;
}
+static int bnxt_refclk_read(struct bnxt *bp, struct ptp_system_timestamp *sts,
+ u64 *ns)
+{
+ struct bnxt_ptp_cfg *ptp = bp->ptp_cfg;
+ unsigned long flags;
+ int rc;
+
+ /* We have to serialize reg access and FW reset */
+ read_seqlock_excl_irqsave(&ptp->ptp_lock, flags);
+ rc = __bnxt_refclk_read(bp, sts, ns);
+ read_sequnlock_excl_irqrestore(&ptp->ptp_lock, flags);
+ return rc;
+}
+
static void bnxt_ptp_get_current_time(struct bnxt *bp)
{
struct bnxt_ptp_cfg *ptp = bp->ptp_cfg;
@@ -674,7 +683,7 @@ static u64 bnxt_cc_read(const struct cyclecounter *cc)
struct bnxt_ptp_cfg *ptp = container_of(cc, struct bnxt_ptp_cfg, cc);
u64 ns = 0;
- bnxt_refclk_read(ptp->bp, NULL, &ns);
+ __bnxt_refclk_read(ptp->bp, NULL, &ns);
return ns;
}
--
2.43.5
Powered by blists - more mailing lists