Re: [PATCH] PCI,pciehp: Move printout before write_cmd

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From	yinghai.lu@oracle.com
Newsgroups	linux.kernel
Subject	Re: [PATCH] PCI,pciehp: Move printout before write_cmd
Date	Thu, 23 Feb 2017 23:00:02 +0100
Message-ID	<te9AC-752-17@gated-at.bofh.it> (permalink)
References	<te8bw-6hU-15@gated-at.bofh.it> <te9AC-752-15@gated-at.bofh.it>
X-Original-To	James Puthukattukaran <james.puthukattukaran@oracle.com>, Yinghai Lu <yinghai@kernel.org>
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X-Original-Cc	Bjorn Helgaas <bhelgaas@google.com>, Ashok Raj <ashok.raj@intel.com>, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org
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yes.


On 02/23/2017 01:55 PM, James Puthukattukaran wrote:
> So, the issue is that you could get the following sequence -
>
> write command
> print out in ISR for pending interrupt
> ctrl_dbg message for write command
>
> and this makes it look like the write command occurred after the 
> pending interrupt message?
>
>
>
> On 02/23/2017 03:28 PM, Yinghai Lu wrote:
>> Bjorn complained some strange print out for pending interrupts.
>>
>> Actually that is caused that have cmd print out after write_cmd.
>>
>> Adjust the sequence to get right order for debug print out.
>>
>> Signed-off-by: Yinghai Lu <yinghai@kernel.org>
>>
>> diff --git a/drivers/pci/hotplug/pciehp_hpc.c 
>> b/drivers/pci/hotplug/pciehp_hpc.c
>> index 026830a..94df18f99 100644
>> --- a/drivers/pci/hotplug/pciehp_hpc.c
>> +++ b/drivers/pci/hotplug/pciehp_hpc.c
>> @@ -475,9 +475,9 @@ void pciehp_set_attention_status(struct slot 
>> *slot, u8 value)
>>       default:
>>           return;
>>       }
>> -    pcie_write_cmd_nowait(ctrl, slot_cmd, PCI_EXP_SLTCTL_AIC);
>>       ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
>>            pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_cmd);
>> +    pcie_write_cmd_nowait(ctrl, slot_cmd, PCI_EXP_SLTCTL_AIC);
>>   }
>>     void pciehp_green_led_on(struct slot *slot)
>> @@ -487,11 +487,11 @@ void pciehp_green_led_on(struct slot *slot)
>>       if (!PWR_LED(ctrl))
>>           return;
>>   -    pcie_write_cmd_nowait(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON,
>> -                  PCI_EXP_SLTCTL_PIC);
>>       ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
>>            pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL,
>>            PCI_EXP_SLTCTL_PWR_IND_ON);
>> +    pcie_write_cmd_nowait(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON,
>> +                  PCI_EXP_SLTCTL_PIC);
>>   }
>>     void pciehp_green_led_off(struct slot *slot)
>> @@ -501,11 +501,11 @@ void pciehp_green_led_off(struct slot *slot)
>>       if (!PWR_LED(ctrl))
>>           return;
>>   -    pcie_write_cmd_nowait(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
>> -                  PCI_EXP_SLTCTL_PIC);
>>       ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
>>            pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL,
>>            PCI_EXP_SLTCTL_PWR_IND_OFF);
>> +    pcie_write_cmd_nowait(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
>> +                  PCI_EXP_SLTCTL_PIC);
>>   }
>>     void pciehp_green_led_blink(struct slot *slot)
>> @@ -515,11 +515,11 @@ void pciehp_green_led_blink(struct slot *slot)
>>       if (!PWR_LED(ctrl))
>>           return;
>>   -    pcie_write_cmd_nowait(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK,
>> -                  PCI_EXP_SLTCTL_PIC);
>>       ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
>>            pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL,
>>            PCI_EXP_SLTCTL_PWR_IND_BLINK);
>> +    pcie_write_cmd_nowait(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK,
>> +                  PCI_EXP_SLTCTL_PIC);
>>   }
>>     int pciehp_power_on_slot(struct slot *slot)
>> @@ -536,10 +536,10 @@ int pciehp_power_on_slot(struct slot *slot)
>>                          PCI_EXP_SLTSTA_PFD);
>>       ctrl->power_fault_detected = 0;
>>   -    pcie_write_cmd(ctrl, PCI_EXP_SLTCTL_PWR_ON, PCI_EXP_SLTCTL_PCC);
>>       ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
>>            pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL,
>>            PCI_EXP_SLTCTL_PWR_ON);
>> +    pcie_write_cmd(ctrl, PCI_EXP_SLTCTL_PWR_ON, PCI_EXP_SLTCTL_PCC);
>>         retval = pciehp_link_enable(ctrl);
>>       if (retval)
>> @@ -552,10 +552,10 @@ void pciehp_power_off_slot(struct slot *slot)
>>   {
>>       struct controller *ctrl = slot->ctrl;
>>   -    pcie_write_cmd(ctrl, PCI_EXP_SLTCTL_PWR_OFF, PCI_EXP_SLTCTL_PCC);
>>       ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
>>            pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL,
>>            PCI_EXP_SLTCTL_PWR_OFF);
>> +    pcie_write_cmd(ctrl, PCI_EXP_SLTCTL_PWR_OFF, PCI_EXP_SLTCTL_PCC);
>>   }
>>     static irqreturn_t pciehp_isr(int irq, void *dev_id)
>> @@ -701,9 +701,9 @@ void pcie_enable_notification(struct controller 
>> *ctrl)
>>           PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE |
>>           PCI_EXP_SLTCTL_DLLSCE);
>>   -    pcie_write_cmd_nowait(ctrl, cmd, mask);
>>       ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
>>            pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, cmd);
>> +    pcie_write_cmd_nowait(ctrl, cmd, mask);
>>   }
>>     static void pcie_disable_notification(struct controller *ctrl)
>> @@ -714,9 +714,9 @@ static void pcie_disable_notification(struct 
>> controller *ctrl)
>>           PCI_EXP_SLTCTL_MRLSCE | PCI_EXP_SLTCTL_PFDE |
>>           PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE |
>>           PCI_EXP_SLTCTL_DLLSCE);
>> -    pcie_write_cmd(ctrl, 0, mask);
>>       ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
>>            pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, 0);
>> +    pcie_write_cmd(ctrl, 0, mask);
>>   }
>>     /*
>> @@ -743,18 +743,18 @@ int pciehp_reset_slot(struct slot *slot, int 
>> probe)
>>       ctrl_mask |= PCI_EXP_SLTCTL_DLLSCE;
>>       stat_mask |= PCI_EXP_SLTSTA_DLLSC;
>>   -    pcie_write_cmd(ctrl, 0, ctrl_mask);
>>       ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
>>            pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, 0);
>> +    pcie_write_cmd(ctrl, 0, ctrl_mask);
>>       if (pciehp_poll_mode)
>>           del_timer_sync(&ctrl->poll_timer);
>>         pci_reset_bridge_secondary_bus(ctrl->pcie->port);
>>         pcie_capability_write_word(pdev, PCI_EXP_SLTSTA, stat_mask);
>> -    pcie_write_cmd_nowait(ctrl, ctrl_mask, ctrl_mask);
>>       ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
>>            pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, ctrl_mask);
>> +    pcie_write_cmd_nowait(ctrl, ctrl_mask, ctrl_mask);
>>       if (pciehp_poll_mode)
>>           int_poll_timeout(ctrl->poll_timer.data);
>

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[PATCH] PCI,pciehp: Move printout before write_cmd Yinghai Lu <yinghai@kernel.org> - 2017-02-23 21:30 +0100
  Re: [PATCH] PCI,pciehp: Move printout before write_cmd James Puthukattukaran <james.puthukattukaran@oracle.com> - 2017-02-23 23:00 +0100
    Re: [PATCH] PCI,pciehp: Move printout before write_cmd yinghai.lu@oracle.com - 2017-02-23 23:00 +0100

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