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Date: Mon, 14 Apr 2014 19:42:59 +0000
From: Rajat Jain <rajatjain@...iper.net>
To: Rajat Jain <rajatxjain@...il.com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC: Guenter Roeck <groeck@...iper.net>
Subject: RE: [PATCH] pci/pciehp: Allow polling/irq mode to be decided on a
per-port basis
Hello Bjorn,
Was wanting to check your interest on up streaming this one. This one is fairly self-contained and simple, and allows to use polling on a per-port basis.
Please let me know you have any comments.
Thanks,
Rajat
> -----Original Message-----
> From: Rajat Jain [mailto:rajatxjain@...il.com]
> Sent: Monday, March 31, 2014 4:52 PM
> To: Bjorn Helgaas; linux-pci@...r.kernel.org; linux-kernel@...r.kernel.org
> Cc: Rajat Jain; Guenter Roeck
> Subject: [PATCH] pci/pciehp: Allow polling/irq mode to be decided on a per-
> port basis
>
> Today, there is a global pciehp_poll_mode module parameter using which
> either _all_ the hot-pluggable ports are to use polling, or _all_ the ports are
> to use interrupts.
>
> In a system where a certain port has IRQ issues, today the only option is to
> use the parameter that converts ALL the ports to use polling mode.
> This is not good, and hence this patch intruduces a bit field that can be set
> using a PCI quirk that indicates that polling should always be used for this
> particular PCIe port. The remaining ports can still hoose to continue to
> operate in whatever mode they wish to.
>
> Signed-off-by: Rajat Jain <rajatxjain@...il.com>
> Signed-off-by: Rajat Jain <rajatjain@...iper.net>
> Signed-off-by: Guenter Roeck <groeck@...iper.net>
> ---
> drivers/pci/hotplug/pciehp.h | 1 +
> drivers/pci/hotplug/pciehp_hpc.c | 16 ++++++++++------
> include/linux/pci.h | 1 +
> 3 files changed, 12 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h
> index d208791..753a3b4 100644
> --- a/drivers/pci/hotplug/pciehp.h
> +++ b/drivers/pci/hotplug/pciehp.h
> @@ -98,6 +98,7 @@ struct controller {
> unsigned int no_cmd_complete:1;
> unsigned int link_active_reporting:1;
> unsigned int notification_enabled:1;
> + unsigned int use_polling:1; /* Always uses polling for this slot */
> unsigned int power_fault_detected;
> };
>
> diff --git a/drivers/pci/hotplug/pciehp_hpc.c
> b/drivers/pci/hotplug/pciehp_hpc.c
> index d7d058f..d210d23 100644
> --- a/drivers/pci/hotplug/pciehp_hpc.c
> +++ b/drivers/pci/hotplug/pciehp_hpc.c
> @@ -82,7 +82,7 @@ static inline int pciehp_request_irq(struct controller
> *ctrl)
> int retval, irq = ctrl->pcie->irq;
>
> /* Install interrupt polling timer. Start with 10 sec delay */
> - if (pciehp_poll_mode) {
> + if (ctrl->use_polling) {
> init_timer(&ctrl->poll_timer);
> start_int_poll_timer(ctrl, 10);
> return 0;
> @@ -98,7 +98,7 @@ static inline int pciehp_request_irq(struct controller
> *ctrl)
>
> static inline void pciehp_free_irq(struct controller *ctrl) {
> - if (pciehp_poll_mode)
> + if (ctrl->use_polling)
> del_timer_sync(&ctrl->poll_timer);
> else
> free_irq(ctrl->pcie->irq, ctrl);
> @@ -131,7 +131,7 @@ static int pcie_poll_cmd(struct controller *ctrl)
>
> static void pcie_wait_cmd(struct controller *ctrl, int poll) {
> - unsigned int msecs = pciehp_poll_mode ? 2500 : 1000;
> + unsigned int msecs = ctrl->use_polling ? 2500 : 1000;
> unsigned long timeout = msecs_to_jiffies(msecs);
> int rc;
>
> @@ -595,7 +595,7 @@ void pcie_enable_notification(struct controller *ctrl)
> cmd |= PCI_EXP_SLTCTL_PDCE;
> if (MRL_SENS(ctrl))
> cmd |= PCI_EXP_SLTCTL_MRLSCE;
> - if (!pciehp_poll_mode)
> + if (!ctrl->use_polling)
> cmd |= PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE;
>
> mask = (PCI_EXP_SLTCTL_PDCE | PCI_EXP_SLTCTL_ABPE | @@ -
> 642,14 +642,14 @@ int pciehp_reset_slot(struct slot *slot, int probe)
> stat_mask |= PCI_EXP_SLTSTA_DLLSC;
>
> pcie_write_cmd(ctrl, 0, ctrl_mask);
> - if (pciehp_poll_mode)
> + if (ctrl->use_polling)
> 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(ctrl, ctrl_mask, ctrl_mask);
> - if (pciehp_poll_mode)
> + if (ctrl->use_polling)
> int_poll_timeout(ctrl->poll_timer.data);
>
> return 0;
> @@ -789,6 +789,10 @@ struct controller *pcie_init(struct pcie_device *dev)
> ctrl_dbg(ctrl, "Link Active Reporting supported\n");
> ctrl->link_active_reporting = 1;
> }
> + if (pciehp_poll_mode || dev->port->hotplug_polling) {
> + ctrl_info(ctrl, "will use polling\n");
> + ctrl->use_polling = 1;
> + }
>
> /* Clear all remaining event bits in Slot Status register */
> pcie_capability_write_word(pdev, PCI_EXP_SLTSTA, diff --git
> a/include/linux/pci.h b/include/linux/pci.h index a13d682..b2ec72e 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -336,6 +336,7 @@ struct pci_dev {
> unsigned int is_virtfn:1;
> unsigned int reset_fn:1;
> unsigned int is_hotplug_bridge:1;
> + unsigned int hotplug_polling:1; /* Port uses polling for hotplug */
> unsigned int __aer_firmware_first_valid:1;
> unsigned int __aer_firmware_first:1;
> unsigned int broken_intx_masking:1;
> --
> 1.7.9.5
>
>
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