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Message-ID: <CACK8Z6Gw3dM1a+kmyBbs1i7FJW-uvfE7NAGLir+ku1ExK9+Qfg@mail.gmail.com>
Date: Thu, 18 Jun 2015 11:02:39 -0700
From: Rajat Jain <rajatja@...gle.com>
To: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: linux-pci@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] PCI: pciehp: Inline the "handle event" functions into
the ISR
Ok to add:
Reviewed-by: Rajat Jain <rajatja@...gle.com>
On Thu, Jun 18, 2015 at 9:12 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> The pciehp_handle_*() functions (pciehp_handle_attention_button(), etc.)
> only contain a line or two of useful code, so it's clumsy to put
> them in separate functions. All they so is add an event to a work queue,
> and it's clearer to see that directly in the ISR.
>
> Inline them directly into pcie_isr(). No functional change.
>
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> ---
> drivers/pci/hotplug/pciehp.h | 6 --
> drivers/pci/hotplug/pciehp_ctrl.c | 105 -------------------------------------
> drivers/pci/hotplug/pciehp_hpc.c | 39 +++++++++++---
> 3 files changed, 32 insertions(+), 118 deletions(-)
>
> diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h
> index ce4d12c..57cd132 100644
> --- a/drivers/pci/hotplug/pciehp.h
> +++ b/drivers/pci/hotplug/pciehp.h
> @@ -132,11 +132,7 @@ struct controller {
>
> int pciehp_sysfs_enable_slot(struct slot *slot);
> int pciehp_sysfs_disable_slot(struct slot *slot);
> -u8 pciehp_handle_attention_button(struct slot *p_slot);
> -u8 pciehp_handle_switch_change(struct slot *p_slot);
> -u8 pciehp_handle_presence_change(struct slot *p_slot);
> -u8 pciehp_handle_power_fault(struct slot *p_slot);
> -void pciehp_handle_linkstate_change(struct slot *p_slot);
> +void pciehp_queue_interrupt_event(struct slot *slot, u32 event_type);
> int pciehp_configure_device(struct slot *p_slot);
> int pciehp_unconfigure_device(struct slot *p_slot);
> void pciehp_queue_pushbutton_work(struct work_struct *work);
> diff --git a/drivers/pci/hotplug/pciehp_ctrl.c b/drivers/pci/hotplug/pciehp_ctrl.c
> index 7ed37dc..f379612 100644
> --- a/drivers/pci/hotplug/pciehp_ctrl.c
> +++ b/drivers/pci/hotplug/pciehp_ctrl.c
> @@ -37,7 +37,7 @@
>
> static void interrupt_event_handler(struct work_struct *work);
>
> -static void pciehp_queue_interrupt_event(struct slot *p_slot, u32 event_type)
> +void pciehp_queue_interrupt_event(struct slot *p_slot, u32 event_type)
> {
> struct event_info *info;
>
> @@ -53,109 +53,6 @@ static void pciehp_queue_interrupt_event(struct slot *p_slot, u32 event_type)
> queue_work(p_slot->wq, &info->work);
> }
>
> -u8 pciehp_handle_attention_button(struct slot *p_slot)
> -{
> - u32 event_type;
> - struct controller *ctrl = p_slot->ctrl;
> -
> - /*
> - * Button pressed - See if need to TAKE ACTION!!!
> - */
> - ctrl_info(ctrl, "Button pressed on Slot(%s)\n", slot_name(p_slot));
> - event_type = INT_BUTTON_PRESS;
> -
> - pciehp_queue_interrupt_event(p_slot, event_type);
> -
> - return 0;
> -}
> -
> -u8 pciehp_handle_switch_change(struct slot *p_slot)
> -{
> - u8 getstatus;
> - u32 event_type;
> - struct controller *ctrl = p_slot->ctrl;
> -
> - pciehp_get_latch_status(p_slot, &getstatus);
> - if (getstatus) {
> - /*
> - * Switch opened
> - */
> - ctrl_info(ctrl, "Latch open on Slot(%s)\n", slot_name(p_slot));
> - event_type = INT_SWITCH_OPEN;
> - } else {
> - /*
> - * Switch closed
> - */
> - ctrl_info(ctrl, "Latch close on Slot(%s)\n", slot_name(p_slot));
> - event_type = INT_SWITCH_CLOSE;
> - }
> -
> - pciehp_queue_interrupt_event(p_slot, event_type);
> -
> - return 1;
> -}
> -
> -u8 pciehp_handle_presence_change(struct slot *p_slot)
> -{
> - u32 event_type;
> - u8 presence_save;
> - struct controller *ctrl = p_slot->ctrl;
> -
> - /* Switch is open, assume a presence change
> - * Save the presence state
> - */
> - pciehp_get_adapter_status(p_slot, &presence_save);
> - if (presence_save) {
> - /*
> - * Card Present
> - */
> - ctrl_info(ctrl, "Card present on Slot(%s)\n", slot_name(p_slot));
> - event_type = INT_PRESENCE_ON;
> - } else {
> - /*
> - * Not Present
> - */
> - ctrl_info(ctrl, "Card not present on Slot(%s)\n",
> - slot_name(p_slot));
> - event_type = INT_PRESENCE_OFF;
> - }
> -
> - pciehp_queue_interrupt_event(p_slot, event_type);
> -
> - return 1;
> -}
> -
> -u8 pciehp_handle_power_fault(struct slot *p_slot)
> -{
> - u32 event_type;
> - struct controller *ctrl = p_slot->ctrl;
> -
> - ctrl_err(ctrl, "Power fault on slot %s\n", slot_name(p_slot));
> - event_type = INT_POWER_FAULT;
> - ctrl_info(ctrl, "Power fault bit %x set\n", 0);
> - pciehp_queue_interrupt_event(p_slot, event_type);
> -
> - return 1;
> -}
> -
> -void pciehp_handle_linkstate_change(struct slot *p_slot)
> -{
> - u32 event_type;
> - struct controller *ctrl = p_slot->ctrl;
> -
> - if (pciehp_check_link_active(ctrl)) {
> - ctrl_info(ctrl, "slot(%s): Link Up event\n",
> - slot_name(p_slot));
> - event_type = INT_LINK_UP;
> - } else {
> - ctrl_info(ctrl, "slot(%s): Link Down event\n",
> - slot_name(p_slot));
> - event_type = INT_LINK_DOWN;
> - }
> -
> - pciehp_queue_interrupt_event(p_slot, event_type);
> -}
> -
> /* The following routines constitute the bulk of the
> hotplug controller logic
> */
> diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
> index e9daaa3..2913f7e 100644
> --- a/drivers/pci/hotplug/pciehp_hpc.c
> +++ b/drivers/pci/hotplug/pciehp_hpc.c
> @@ -535,6 +535,8 @@ static irqreturn_t pcie_isr(int irq, void *dev_id)
> struct pci_dev *dev;
> struct slot *slot = ctrl->slot;
> u16 detected, intr_loc;
> + u8 open, present;
> + bool link;
>
> /*
> * In order to guarantee that all interrupt events are
> @@ -580,25 +582,44 @@ static irqreturn_t pcie_isr(int irq, void *dev_id)
> return IRQ_HANDLED;
>
> /* Check MRL Sensor Changed */
> - if (intr_loc & PCI_EXP_SLTSTA_MRLSC)
> - pciehp_handle_switch_change(slot);
> + if (intr_loc & PCI_EXP_SLTSTA_MRLSC) {
> + pciehp_get_latch_status(slot, &open);
> + ctrl_info(ctrl, "Latch %s on Slot(%s)\n",
> + open ? "open" : "close", slot_name(slot));
> + pciehp_queue_interrupt_event(slot, open ? INT_SWITCH_OPEN :
> + INT_SWITCH_CLOSE);
> + }
>
> /* Check Attention Button Pressed */
> - if (intr_loc & PCI_EXP_SLTSTA_ABP)
> - pciehp_handle_attention_button(slot);
> + if (intr_loc & PCI_EXP_SLTSTA_ABP) {
> + ctrl_info(ctrl, "Button pressed on Slot(%s)\n",
> + slot_name(slot));
> + pciehp_queue_interrupt_event(slot, INT_BUTTON_PRESS);
> + }
>
> /* Check Presence Detect Changed */
> - if (intr_loc & PCI_EXP_SLTSTA_PDC)
> - pciehp_handle_presence_change(slot);
> + if (intr_loc & PCI_EXP_SLTSTA_PDC) {
> + pciehp_get_adapter_status(slot, &present);
> + ctrl_info(ctrl, "Card %spresent on Slot(%s)\n",
> + present ? "" : "not ", slot_name(slot));
> + pciehp_queue_interrupt_event(slot, present ? INT_PRESENCE_ON :
> + INT_PRESENCE_OFF);
> + }
>
> /* Check Power Fault Detected */
> if ((intr_loc & PCI_EXP_SLTSTA_PFD) && !ctrl->power_fault_detected) {
> ctrl->power_fault_detected = 1;
> - pciehp_handle_power_fault(slot);
> + ctrl_err(ctrl, "Power fault on slot %s\n", slot_name(slot));
> + pciehp_queue_interrupt_event(slot, INT_POWER_FAULT);
> }
>
> - if (intr_loc & PCI_EXP_SLTSTA_DLLSC)
> - pciehp_handle_linkstate_change(slot);
> + if (intr_loc & PCI_EXP_SLTSTA_DLLSC) {
> + link = pciehp_check_link_active(ctrl);
> + ctrl_info(ctrl, "slot(%s): Link %s event\n",
> + slot_name(slot), link ? "Up" : "Down");
> + pciehp_queue_interrupt_event(slot, link ? INT_LINK_UP :
> + INT_LINK_DOWN);
> + }
>
> return IRQ_HANDLED;
> }
>
--
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