All of lore.kernel.org
 help / color / mirror / Atom feed
From: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
To: kishon@ti.com, lorenzo.pieralisi@arm.com, bhelgaas@google.com
Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-msm@vger.kernel.org, hemantk@codeaurora.org,
	smohanad@codeaurora.org,
	Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Subject: [PATCH 3/5] PCI: endpoint: Add PME notifier support
Date: Wed, 16 Jun 2021 17:29:11 +0530	[thread overview]
Message-ID: <20210616115913.138778-4-manivannan.sadhasivam@linaro.org> (raw)
In-Reply-To: <20210616115913.138778-1-manivannan.sadhasivam@linaro.org>

Add support to notify the EPF device about the Power Management Event
(PME) received by the EPC device from the Root complex.

Usage:
======

EPC
---

```
static irqreturn_t pcie_ep_irq(int irq, void *data)
{
...
	case PCIE_EP_INT_PM_TURNOFF:
		pci_epc_pme_notify(epc, PCIE_EP_PM_TURNOFF);
		break;
...
}
```

EPF
---

```
static int pci_epf_notifier(struct notifier_block *nb, unsigned long val,
			    void *data)
{
...
	case PME:
		pm_state = data;
		if (pm_state == PCIE_EP_PM_TURNOFF)
			/* Handle PM Turnoff event */
		break;
...
}
```

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/pci/endpoint/pci-epc-core.c | 18 ++++++++++++++++++
 include/linux/pci-epc.h             |  1 +
 include/linux/pci-epf.h             |  1 +
 3 files changed, 20 insertions(+)

diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index 7e42a83a4877..63fe90dbbba2 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -692,6 +692,24 @@ void pci_epc_bme_notify(struct pci_epc *epc)
 }
 EXPORT_SYMBOL_GPL(pci_epc_bme_notify);
 
+/**
+ * pci_epc_pme_notify() - Notify the EPF device that the EPC device has received
+ *			  the PME from the Root complex
+ * @epc: the EPC device that received the PME
+ * @data: Data for the PME notifier
+ *
+ * Invoke to Notify the EPF device that the EPC device has received the Power
+ * Management Event (PME) from the Root complex
+ */
+void pci_epc_pme_notify(struct pci_epc *epc, void *data)
+{
+	if (!epc || IS_ERR(epc))
+		return;
+
+	atomic_notifier_call_chain(&epc->notifier, PME, data);
+}
+EXPORT_SYMBOL_GPL(pci_epc_pme_notify);
+
 /**
  * pci_epc_destroy() - destroy the EPC device
  * @epc: the EPC device that has to be destroyed
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index 6c2cff33f670..37dbcade1780 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -205,6 +205,7 @@ void pci_epc_linkup(struct pci_epc *epc);
 void pci_epc_linkdown(struct pci_epc *epc);
 void pci_epc_init_notify(struct pci_epc *epc);
 void pci_epc_bme_notify(struct pci_epc *epc);
+void pci_epc_pme_notify(struct pci_epc *epc, void *data);
 void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf,
 			enum pci_epc_interface_type type);
 int pci_epc_write_header(struct pci_epc *epc, u8 func_no,
diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h
index 063a59a58e3c..c162a73eb836 100644
--- a/include/linux/pci-epf.h
+++ b/include/linux/pci-epf.h
@@ -22,6 +22,7 @@ enum pci_notify_event {
 	LINK_UP,
 	LINK_DOWN,
 	BME,
+	PME,
 };
 
 enum pci_barno {
-- 
2.25.1


  parent reply	other threads:[~2021-06-16 12:00 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-16 11:59 [PATCH 0/5] PCI: endpoint: Add support for additional notifiers Manivannan Sadhasivam
2021-06-16 11:59 ` [PATCH 1/5] PCI: endpoint: Add linkdown notifier support Manivannan Sadhasivam
2021-06-16 18:22   ` Om Prakash Singh
2021-06-16 18:30     ` Manivannan Sadhasivam
2021-06-16 11:59 ` [PATCH 2/5] PCI: endpoint: Add BME " Manivannan Sadhasivam
2021-06-16 11:59 ` Manivannan Sadhasivam [this message]
2021-06-16 11:59 ` [PATCH 4/5] PCI: endpoint: Add D_STATE " Manivannan Sadhasivam
2021-06-16 11:59 ` [PATCH 5/5] PCI: endpoint: Add custom " Manivannan Sadhasivam
2021-06-16 19:12 ` [PATCH 0/5] PCI: endpoint: Add support for additional notifiers Om Prakash Singh
2021-06-17 17:05   ` Manivannan Sadhasivam
2021-08-19 13:06 ` Manivannan Sadhasivam
2021-08-19 14:15 ` Kishon Vijay Abraham I
2021-08-19 14:22   ` Manivannan Sadhasivam

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210616115913.138778-4-manivannan.sadhasivam@linaro.org \
    --to=manivannan.sadhasivam@linaro.org \
    --cc=bhelgaas@google.com \
    --cc=hemantk@codeaurora.org \
    --cc=kishon@ti.com \
    --cc=linux-arm-msm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pci@vger.kernel.org \
    --cc=lorenzo.pieralisi@arm.com \
    --cc=smohanad@codeaurora.org \
    --subject='Re: [PATCH 3/5] PCI: endpoint: Add PME notifier support' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.