From: Krishna chaitanya chundru <quic_krichai@quicinc.com>
To: manivannan.sadhasivam@linaro.org
Cc: helgaas@kernel.org, linux-pci@vger.kernel.org,
linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
quic_vbadigan@quicinc.com, quic_nitegupt@quicinc.com,
quic_skananth@quicinc.com, quic_ramkri@quicinc.com,
quic_parass@quicinc.com, krzysztof.kozlowski@linaro.org,
"Krishna chaitanya chundru" <quic_krichai@quicinc.com>,
"Lorenzo Pieralisi" <lpieralisi@kernel.org>,
"Krzysztof Wilczyński" <kw@linux.com>,
"Manivannan Sadhasivam" <mani@kernel.org>,
"Kishon Vijay Abraham I" <kishon@kernel.org>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Jonathan Corbet" <corbet@lwn.net>,
linux-doc@vger.kernel.org (open list:DOCUMENTATION)
Subject: [PATCH v5 1/5] PCI: endpoint: Add wakeup host API to EPC core
Date: Wed, 2 Aug 2023 10:29:15 +0530 [thread overview]
Message-ID: <1690952359-8625-2-git-send-email-quic_krichai@quicinc.com> (raw)
In-Reply-To: <1690952359-8625-1-git-send-email-quic_krichai@quicinc.com>
Endpoint cannot send any data/MSI when the D-state is in
D3cold or D3hot. Endpoint needs to wake up the host to
bring the D-state to D0.
Endpoint can toggle wake signal when the D-state is in D3cold and vaux is
not supplied or can send inband PME.
To support this add wakeup_host() callback to the EPC core.
Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com>
---
Documentation/PCI/endpoint/pci-endpoint.rst | 6 ++++++
drivers/pci/endpoint/pci-epc-core.c | 30 +++++++++++++++++++++++++++++
include/linux/pci-epc.h | 5 +++++
3 files changed, 41 insertions(+)
diff --git a/Documentation/PCI/endpoint/pci-endpoint.rst b/Documentation/PCI/endpoint/pci-endpoint.rst
index 66f3191..9a96ce0 100644
--- a/Documentation/PCI/endpoint/pci-endpoint.rst
+++ b/Documentation/PCI/endpoint/pci-endpoint.rst
@@ -53,6 +53,7 @@ by the PCI controller driver.
* raise_irq: ops to raise a legacy, MSI or MSI-X interrupt
* start: ops to start the PCI link
* stop: ops to stop the PCI link
+ * wakeup_host: ops to wakeup host
The PCI controller driver can then create a new EPC device by invoking
devm_pci_epc_create()/pci_epc_create().
@@ -121,6 +122,11 @@ by the PCI endpoint function driver.
The PCI endpoint function driver should use pci_epc_mem_free_addr() to
free the memory space allocated using pci_epc_mem_alloc_addr().
+* pci_epc_wakeup_host()
+
+ The PCI endpoint function driver should use pci_epc_wakeup_host() to wakeup
+ host.
+
Other EPC APIs
~~~~~~~~~~~~~~
diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index 4cf9c82..afd6a25 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -167,6 +167,36 @@ const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc,
EXPORT_SYMBOL_GPL(pci_epc_get_features);
/**
+ * pci_epc_wakeup_host() - Wakeup the host
+ * @epc: the EPC device which has to wakeup the host
+ * @func_no: the physical endpoint function number in the EPC device
+ * @vfunc_no: the virtual endpoint function number in the physical function
+ * @send_pme: true if wakeup is by sending PME
+ *
+ * Invoke to wakeup host
+ */
+bool pci_epc_wakeup_host(struct pci_epc *epc, u8 func_no, u8 vfunc_no, bool send_pme)
+{
+ int ret;
+
+ if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
+ return false;
+
+ if (vfunc_no > 0 && (!epc->max_vfs || vfunc_no > epc->max_vfs[func_no]))
+ return false;
+
+ if (!epc->ops->wakeup_host)
+ return true;
+
+ mutex_lock(&epc->lock);
+ ret = epc->ops->wakeup_host(epc, func_no, vfunc_no, send_pme);
+ mutex_unlock(&epc->lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(pci_epc_wakeup_host);
+
+/**
* pci_epc_stop() - stop the PCI link
* @epc: the link of the EPC device that has to be stopped
*
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index 26a1108..166a86b 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -59,6 +59,7 @@ pci_epc_interface_string(enum pci_epc_interface_type type)
* @start: ops to start the PCI link
* @stop: ops to stop the PCI link
* @get_features: ops to get the features supported by the EPC
+ * @wakeup_host: ops to wakeup the host
* @owner: the module owner containing the ops
*/
struct pci_epc_ops {
@@ -88,6 +89,8 @@ struct pci_epc_ops {
void (*stop)(struct pci_epc *epc);
const struct pci_epc_features* (*get_features)(struct pci_epc *epc,
u8 func_no, u8 vfunc_no);
+ bool (*wakeup_host)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
+ bool send_pme);
struct module *owner;
};
@@ -234,6 +237,8 @@ int pci_epc_start(struct pci_epc *epc);
void pci_epc_stop(struct pci_epc *epc);
const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc,
u8 func_no, u8 vfunc_no);
+bool pci_epc_wakeup_host(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
+ bool send_pme);
enum pci_barno
pci_epc_get_first_free_bar(const struct pci_epc_features *epc_features);
enum pci_barno pci_epc_get_next_free_bar(const struct pci_epc_features
--
2.7.4
next prev parent reply other threads:[~2023-08-02 4:59 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-02 4:59 [PATCH v5 0/5] PCI: EPC: Add support to wake up host from D3 states Krishna chaitanya chundru
2023-08-02 4:59 ` Krishna chaitanya chundru [this message]
2023-08-02 4:59 ` [PATCH v5 2/5] PCI: dwc: Add wakeup host op to pci_epc_ops Krishna chaitanya chundru
2023-08-02 4:59 ` [PATCH v5 3/5] PCI: qcom-ep: Add wake up host op to dw_pcie_ep_ops Krishna chaitanya chundru
2023-08-02 4:59 ` [PATCH v5 4/5] PCI: epf-mhi: Add wakeup host op Krishna chaitanya chundru
2023-08-02 4:59 ` [PATCH v5 5/5] bus: mhi: ep: wake up host if the MHI state is in M3 Krishna chaitanya chundru
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