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From: Jon Derrick <jonathan.derrick@intel.com>
To: Bjorn Helgaas <helgaas@kernel.org>
Cc: <linux-pci@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	Andy Shevchenko <andriy.shevchenko@intel.com>,
	Mika Westerberg <mika.westerberg@linux.intel.com>,
	Pawel Baldysiak <pawel.baldysiak@intel.com>,
	Sinan Kaya <okaya@kernel.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Keith Busch <kbusch@kernel.org>,
	Alexandru Gagniuc <mr.nuke.me@gmail.com>,
	Christoph Hellwig <hch@lst.de>,
	Jon Derrick <jonathan.derrick@intel.com>
Subject: [RFC 6/9] PCI: pciehp: Expose the poll loop to other drivers
Date: Fri,  7 Feb 2020 17:00:04 -0700	[thread overview]
Message-ID: <1581120007-5280-7-git-send-email-jonathan.derrick@intel.com> (raw)
In-Reply-To: <1581120007-5280-1-git-send-email-jonathan.derrick@intel.com>

Abstract the poll loop into an 'events pending' check and a 'handle
events' method in order to allow another driver to call the polling
loop.

Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
---
 drivers/pci/hotplug/pciehp.h     |  2 ++
 drivers/pci/hotplug/pciehp_hpc.c | 16 +++++++++++++---
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h
index c898c75..48fdd62 100644
--- a/drivers/pci/hotplug/pciehp.h
+++ b/drivers/pci/hotplug/pciehp.h
@@ -160,6 +160,8 @@ struct controller {
 #define NO_CMD_CMPL(ctrl)	((ctrl)->slot_cap & PCI_EXP_SLTCAP_NCCS)
 #define PSN(ctrl)		(((ctrl)->slot_cap & PCI_EXP_SLTCAP_PSN) >> 19)
 
+bool pciehp_events_pending(struct controller *ctrl);
+void pciehp_handle_events(struct controller *ctrl);
 void pciehp_request(struct controller *ctrl, int action);
 void pciehp_handle_button_press(struct controller *ctrl);
 void pciehp_handle_disable_request(struct controller *ctrl);
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index ce1e8c7..e46f177 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -708,6 +708,17 @@ static irqreturn_t pciehp_ist(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
+bool pciehp_events_pending(struct controller *ctrl)
+{
+	return pciehp_isr(IRQ_NOTCONNECTED, ctrl) == IRQ_WAKE_THREAD ||
+	       atomic_read(&ctrl->pending_events);
+}
+
+void pciehp_handle_events(struct controller *ctrl)
+{
+	pciehp_ist(IRQ_NOTCONNECTED, ctrl);
+}
+
 static int pciehp_poll(void *data)
 {
 	struct controller *ctrl = data;
@@ -716,9 +727,8 @@ static int pciehp_poll(void *data)
 
 	while (!kthread_should_stop()) {
 		/* poll for interrupt events or user requests */
-		while (pciehp_isr(IRQ_NOTCONNECTED, ctrl) == IRQ_WAKE_THREAD ||
-		       atomic_read(&ctrl->pending_events))
-			pciehp_ist(IRQ_NOTCONNECTED, ctrl);
+		while (pciehp_events_pending(ctrl))
+			pciehp_handle_events(ctrl);
 
 		if (pciehp_poll_time <= 0 || pciehp_poll_time > 60)
 			pciehp_poll_time = 2; /* clamp to sane value */
-- 
1.8.3.1


  parent reply	other threads:[~2020-02-08  0:00 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-07 23:59 [RFC 0/9] PCIe Hotplug Slot Emulation driver Jon Derrick
2020-02-07 23:59 ` [RFC 1/9] PCI: pci-bridge-emul: Update PCIe register behaviors Jon Derrick
2020-02-08  9:55   ` Andy Shevchenko
2020-03-28 21:42   ` Bjorn Helgaas
2020-02-08  0:00 ` [RFC 2/9] PCI: pci-bridge-emul: Eliminate reserved member Jon Derrick
2020-03-28 21:43   ` Bjorn Helgaas
2020-02-08  0:00 ` [RFC 3/9] PCI: pci-bridge-emul: Provide a helper to set behavior Jon Derrick
2020-02-08  0:00 ` [RFC 4/9] PCI: pciehp: Indirect slot register operations Jon Derrick
2020-02-08  0:00 ` [RFC 5/9] PCI: Add pcie_port_slot_emulated stub Jon Derrick
2020-02-08  0:00 ` Jon Derrick [this message]
2020-02-08  0:00 ` [RFC 7/9] PCI: Move pci_dev_str_match to search.c Jon Derrick
2020-02-08  0:00 ` [RFC 8/9] PCI: pciehp: Add hotplug slot emulation driver Jon Derrick
2020-02-08  0:00 ` [RFC 9/9] PCI: pciehp: Wire up pcie_port_emulate_slot and pciehp_emul Jon Derrick
2020-02-10  7:01 ` [RFC 0/9] PCIe Hotplug Slot Emulation driver Christoph Hellwig
2020-02-10 15:05   ` Derrick, Jonathan
2020-02-10 16:58     ` hch
2020-02-10 17:09       ` Derrick, Jonathan
2020-03-28 21:51 ` Bjorn Helgaas
2020-03-30 17:43   ` Derrick, Jonathan
2020-03-30 17:49     ` hch
2020-04-01 21:45     ` Bjorn Helgaas

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