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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: a6cb4ff8-6f35-4d83-549d-08dcf3fac893 X-MS-Exchange-CrossTenant-AuthSource: PAXPR04MB8510.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Oct 2024 07:09:21.4404 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: LLeZSj4HgnP10p5SKav1I/9m4WB3Wj3Yr3k0x4BAcOK/+nxXSIMgkVvf84jgavvCvaIwjBkrLqdIv6VXYTUGKA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR04MB8627 From: Vladimir Oltean The ERR050089 workaround causes performance degradation and potential functional issues (e.g., RCU stalls) under certain workloads. Since new SoCs like i.MX95 do not require this workaround, use a static key to compile out enetc_lock_mdio() and enetc_unlock_mdio() at runtime, improving performance and avoiding unnecessary logic. Signed-off-by: Vladimir Oltean Signed-off-by: Wei Fang Reviewed-by: Frank Li --- v5: no changes --- .../net/ethernet/freescale/enetc/enetc_hw.h | 34 +++++++++++++------ .../ethernet/freescale/enetc/enetc_pci_mdio.c | 17 ++++++++++ 2 files changed, 41 insertions(+), 10 deletions(-) diff --git a/drivers/net/ethernet/freescale/enetc/enetc_hw.h b/drivers/net/ethernet/freescale/enetc/enetc_hw.h index 1619943fb263..6a7b9b75d660 100644 --- a/drivers/net/ethernet/freescale/enetc/enetc_hw.h +++ b/drivers/net/ethernet/freescale/enetc/enetc_hw.h @@ -396,18 +396,22 @@ struct enetc_hw { */ extern rwlock_t enetc_mdio_lock; +DECLARE_STATIC_KEY_FALSE(enetc_has_err050089); + /* use this locking primitive only on the fast datapath to * group together multiple non-MDIO register accesses to * minimize the overhead of the lock */ static inline void enetc_lock_mdio(void) { - read_lock(&enetc_mdio_lock); + if (static_branch_unlikely(&enetc_has_err050089)) + read_lock(&enetc_mdio_lock); } static inline void enetc_unlock_mdio(void) { - read_unlock(&enetc_mdio_lock); + if (static_branch_unlikely(&enetc_has_err050089)) + read_unlock(&enetc_mdio_lock); } /* use these accessors only on the fast datapath under @@ -416,14 +420,16 @@ static inline void enetc_unlock_mdio(void) */ static inline u32 enetc_rd_reg_hot(void __iomem *reg) { - lockdep_assert_held(&enetc_mdio_lock); + if (static_branch_unlikely(&enetc_has_err050089)) + lockdep_assert_held(&enetc_mdio_lock); return ioread32(reg); } static inline void enetc_wr_reg_hot(void __iomem *reg, u32 val) { - lockdep_assert_held(&enetc_mdio_lock); + if (static_branch_unlikely(&enetc_has_err050089)) + lockdep_assert_held(&enetc_mdio_lock); iowrite32(val, reg); } @@ -452,9 +458,13 @@ static inline u32 _enetc_rd_mdio_reg_wa(void __iomem *reg) unsigned long flags; u32 val; - write_lock_irqsave(&enetc_mdio_lock, flags); - val = ioread32(reg); - write_unlock_irqrestore(&enetc_mdio_lock, flags); + if (static_branch_unlikely(&enetc_has_err050089)) { + write_lock_irqsave(&enetc_mdio_lock, flags); + val = ioread32(reg); + write_unlock_irqrestore(&enetc_mdio_lock, flags); + } else { + val = ioread32(reg); + } return val; } @@ -463,9 +473,13 @@ static inline void _enetc_wr_mdio_reg_wa(void __iomem *reg, u32 val) { unsigned long flags; - write_lock_irqsave(&enetc_mdio_lock, flags); - iowrite32(val, reg); - write_unlock_irqrestore(&enetc_mdio_lock, flags); + if (static_branch_unlikely(&enetc_has_err050089)) { + write_lock_irqsave(&enetc_mdio_lock, flags); + iowrite32(val, reg); + write_unlock_irqrestore(&enetc_mdio_lock, flags); + } else { + iowrite32(val, reg); + } } #ifdef ioread64 diff --git a/drivers/net/ethernet/freescale/enetc/enetc_pci_mdio.c b/drivers/net/ethernet/freescale/enetc/enetc_pci_mdio.c index a1b595bd7993..2445e35a764a 100644 --- a/drivers/net/ethernet/freescale/enetc/enetc_pci_mdio.c +++ b/drivers/net/ethernet/freescale/enetc/enetc_pci_mdio.c @@ -9,6 +9,9 @@ #define ENETC_MDIO_BUS_NAME ENETC_MDIO_DEV_NAME " Bus" #define ENETC_MDIO_DRV_NAME ENETC_MDIO_DEV_NAME " driver" +DEFINE_STATIC_KEY_FALSE(enetc_has_err050089); +EXPORT_SYMBOL_GPL(enetc_has_err050089); + static int enetc_pci_mdio_probe(struct pci_dev *pdev, const struct pci_device_id *ent) { @@ -62,6 +65,12 @@ static int enetc_pci_mdio_probe(struct pci_dev *pdev, goto err_pci_mem_reg; } + if (pdev->vendor == PCI_VENDOR_ID_FREESCALE && + pdev->device == ENETC_MDIO_DEV_ID) { + static_branch_inc(&enetc_has_err050089); + dev_info(&pdev->dev, "Enabled ERR050089 workaround\n"); + } + err = of_mdiobus_register(bus, dev->of_node); if (err) goto err_mdiobus_reg; @@ -88,6 +97,14 @@ static void enetc_pci_mdio_remove(struct pci_dev *pdev) struct enetc_mdio_priv *mdio_priv; mdiobus_unregister(bus); + + if (pdev->vendor == PCI_VENDOR_ID_FREESCALE && + pdev->device == ENETC_MDIO_DEV_ID) { + static_branch_dec(&enetc_has_err050089); + if (!static_key_enabled(&enetc_has_err050089.key)) + dev_info(&pdev->dev, "Disabled ERR050089 workaround\n"); + } + mdio_priv = bus->priv; iounmap(mdio_priv->hw->port); pci_release_region(pdev, 0);