Messages in this thread | | | From | <> | Subject | Re: [PATCH v6 1/2] net: macb: WoL support for GEM type of Ethernet controller | Date | Wed, 15 Jul 2020 08:10:27 +0000 |
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On 13/07/2020 at 17:45, Claudiu Beznea - M18063 wrote: > Hi Nicolas, > > > On 13.07.2020 13:05, nicolas.ferre@microchip.com wrote: >> From: Nicolas Ferre <nicolas.ferre@microchip.com> >> >> Adapt the Wake-on-Lan feature to the Cadence GEM Ethernet controller. >> This controller has different register layout and cannot be handled by >> previous code. >> We disable completely interrupts on all the queues but the queue 0. >> Handling of WoL interrupt is done in another interrupt handler >> positioned depending on the controller version used, just between >> suspend() and resume() calls. >> It allows to lower pressure on the generic interrupt hot path by >> removing the need to handle 2 tests for each IRQ: the first figuring out >> the controller revision, the second for actually knowing if the WoL bit >> is set. >> >> Queue management in suspend()/resume() functions inspired from RFC patch >> by Harini Katakam <harinik@xilinx.com>, thanks! >> >> Cc: Claudiu Beznea <claudiu.beznea@microchip.com> >> Cc: Harini Katakam <harini.katakam@xilinx.com> >> Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com> >> --- >> Changes in v6: >> - Values of registers usrio and scrt2 properly read in any case (WoL or not) >> during macb_suspend() to be restored during macb_resume() >> >> Changes in v3: >> - In macb_resume(), move to a more in-depth re-configuration of the controller >> even on the non-WoL path in order to accept deeper sleep states. >> - this ends up having a phylink_stop()/phylink_start() for each of the >> WoL/!WoL paths >> - In macb_resume(), keep setting the MPE bit in NCR register which is needed in >> case of deep power saving mode used >> - Tests done in "standby" as well as our deeper Power Management mode: >> Backup Self-Refresh (BSR) >> >> Changes in v2: >> - Addition of pm_wakeup_event() in WoL IRQ >> - In macb_resume(), removal of setting the MPE bit in NCR register which is not >> needed in any case: IP is reset on the usual path and kept alive if WoL is used >> - In macb_resume(), complete reset of the controller is kept only for non-WoL >> case. For the WoL case, we only replace the usual IRQ handler. >> >> drivers/net/ethernet/cadence/macb.h | 3 + >> drivers/net/ethernet/cadence/macb_main.c | 151 +++++++++++++++++++---- >> 2 files changed, 127 insertions(+), 27 deletions(-) >> >> diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h >> index ab827fb4b6b9..4f1b41569260 100644 >> --- a/drivers/net/ethernet/cadence/macb.h >> +++ b/drivers/net/ethernet/cadence/macb.h >> @@ -90,6 +90,7 @@ >> #define GEM_SA3T 0x009C /* Specific3 Top */ >> #define GEM_SA4B 0x00A0 /* Specific4 Bottom */ >> #define GEM_SA4T 0x00A4 /* Specific4 Top */ >> +#define GEM_WOL 0x00b8 /* Wake on LAN */ >> #define GEM_EFTSH 0x00e8 /* PTP Event Frame Transmitted Seconds Register 47:32 */ >> #define GEM_EFRSH 0x00ec /* PTP Event Frame Received Seconds Register 47:32 */ >> #define GEM_PEFTSH 0x00f0 /* PTP Peer Event Frame Transmitted Seconds Register 47:32 */ >> @@ -396,6 +397,8 @@ >> #define MACB_PDRSFT_SIZE 1 >> #define MACB_SRI_OFFSET 26 /* TSU Seconds Register Increment */ >> #define MACB_SRI_SIZE 1 >> +#define GEM_WOL_OFFSET 28 /* Enable wake-on-lan interrupt */ >> +#define GEM_WOL_SIZE 1 >> >> /* Timer increment fields */ >> #define MACB_TI_CNS_OFFSET 0 >> diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c >> index e5e37aa81b02..122c54e40f91 100644 >> --- a/drivers/net/ethernet/cadence/macb_main.c >> +++ b/drivers/net/ethernet/cadence/macb_main.c >> @@ -1517,6 +1517,35 @@ static void macb_tx_restart(struct macb_queue *queue) >> macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART)); >> } >> >> +static irqreturn_t gem_wol_interrupt(int irq, void *dev_id) >> +{ >> + struct macb_queue *queue = dev_id; >> + struct macb *bp = queue->bp; >> + u32 status; >> + >> + status = queue_readl(queue, ISR); >> + >> + if (unlikely(!status)) >> + return IRQ_NONE; >> + >> + spin_lock(&bp->lock); >> + >> + if (status & GEM_BIT(WOL)) { >> + queue_writel(queue, IDR, GEM_BIT(WOL)); >> + gem_writel(bp, WOL, 0); >> + netdev_vdbg(bp->dev, "GEM WoL: queue = %u, isr = 0x%08lx\n", >> + (unsigned int)(queue - bp->queues), >> + (unsigned long)status); >> + if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) >> + queue_writel(queue, ISR, GEM_BIT(WOL)); >> + pm_wakeup_event(&bp->pdev->dev, 0); >> + } >> + >> + spin_unlock(&bp->lock); >> + >> + return IRQ_HANDLED; >> +} >> + >> static irqreturn_t macb_interrupt(int irq, void *dev_id) >> { >> struct macb_queue *queue = dev_id; >> @@ -3316,6 +3345,8 @@ static const struct ethtool_ops macb_ethtool_ops = { >> static const struct ethtool_ops gem_ethtool_ops = { >> .get_regs_len = macb_get_regs_len, >> .get_regs = macb_get_regs, >> + .get_wol = macb_get_wol, >> + .set_wol = macb_set_wol, >> .get_link = ethtool_op_get_link, >> .get_ts_info = macb_get_ts_info, >> .get_ethtool_stats = gem_get_ethtool_stats, >> @@ -4567,33 +4598,67 @@ static int __maybe_unused macb_suspend(struct device *dev) >> struct macb_queue *queue = bp->queues; >> unsigned long flags; >> unsigned int q; >> + int err; >> >> if (!netif_running(netdev)) >> return 0; >> >> if (bp->wol & MACB_WOL_ENABLED) { >> - macb_writel(bp, IER, MACB_BIT(WOL)); >> - macb_writel(bp, WOL, MACB_BIT(MAG)); >> - enable_irq_wake(bp->queues[0].irq); >> - netif_device_detach(netdev); >> - } else { >> - netif_device_detach(netdev); >> + spin_lock_irqsave(&bp->lock, flags); >> + /* Flush all status bits */ >> + macb_writel(bp, TSR, -1); >> + macb_writel(bp, RSR, -1); >> for (q = 0, queue = bp->queues; q < bp->num_queues; >> - ++q, ++queue) >> - napi_disable(&queue->napi); >> + ++q, ++queue) { >> + /* Disable all interrupts */ >> + queue_writel(queue, IDR, -1); >> + queue_readl(queue, ISR); >> + if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) >> + queue_writel(queue, ISR, -1); >> + } >> + /* Change interrupt handler and >> + * Enable WoL IRQ on queue 0 >> + */ >> + if (macb_is_gem(bp)) { >> + devm_free_irq(dev, bp->queues[0].irq, bp->queues); >> + err = devm_request_irq(dev, bp->queues[0].irq, gem_wol_interrupt, >> + IRQF_SHARED, netdev->name, bp->queues); >> + if (err) { >> + dev_err(dev, >> + "Unable to request IRQ %d (error %d)\n", >> + bp->queues[0].irq, err); >> + return err; > > Restoring from this state will complicate the code here even further. > At least release the spinlock before exiting.
Oh yes, good catch Claudiu. It'll be fixed in v7.
I give this series a couple of days more and plan to re-send by the end of the week. >> + } >> + queue_writel(bp->queues, IER, GEM_BIT(WOL)); >> + gem_writel(bp, WOL, MACB_BIT(MAG)); >> + } else { >> + queue_writel(bp->queues, IER, MACB_BIT(WOL)); >> + macb_writel(bp, WOL, MACB_BIT(MAG)); >> + } >> + spin_unlock_irqrestore(&bp->lock, flags); >> + >> + enable_irq_wake(bp->queues[0].irq); >> + } >> +
[..]
>> + /* Replace interrupt handler on queue 0 */ >> + devm_free_irq(dev, bp->queues[0].irq, bp->queues); >> + err = devm_request_irq(dev, bp->queues[0].irq, macb_interrupt, >> + IRQF_SHARED, netdev->name, bp->queues); >> + if (err) { >> + dev_err(dev, >> + "Unable to request IRQ %d (error %d)\n", >> + bp->queues[0].irq, err); >> + return err; > > Same here.
Ok.
>> + } >> + spin_unlock_irqrestore(&bp->lock, flags);
[..]
Thanks for your review. Best regards, -- Nicolas Ferre
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