linux-kernel - [PATCH 01/15] PCI: endpoint: Add new pci_epc

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Date:   Mon, 7 Jan 2019 12:11:34 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Alan Douglas <adouglas@...ence.com>,
        Shawn Lin <shawn.lin@...k-chips.com>
CC:     Jingoo Han <jingoohan1@...il.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Cyrille Pitchen <cyrille.pitchen@...e-electrons.com>,
        Jia-Ju Bai <baijiaju1990@...il.com>,
        <linux-omap@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-rockchip@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>, <kishon@...com>
Subject: [PATCH 01/15] PCI: endpoint: Add new pci_epc_ops to get EPC features

Add a new pci_epc_ops ->get_features() to get the features
supported by EPC. Since EPC can provide different features to
different functions, the ->get_features() ops takes _func_no_ as
an argument.

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/pci/endpoint/pci-epc-core.c | 30 +++++++++++++++++++++++++++++
 include/linux/pci-epc.h             | 22 +++++++++++++++++++++
 2 files changed, 52 insertions(+)

diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index 094dcc3203b8..5a099479d9ab 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -83,6 +83,36 @@ struct pci_epc *pci_epc_get(const char *epc_name)
 }
 EXPORT_SYMBOL_GPL(pci_epc_get);
 
+/**
+ * pci_epc_get_features() - get the features supported by EPC
+ * @epc: the features supported by *this* EPC device will be returned
+ * @func_no: the features supported by the EPC device specific to the
+ *	     endpoint function with func_no will be returned
+ *
+ * Invoke to get the features provided by the EPC which may be
+ * specific to an endpoint function. Returns pci_epc_features on success
+ * and NULL for any failures.
+ */
+const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc,
+						    u8 func_no)
+{
+	const struct pci_epc_features *epc_features;
+	unsigned long flags;
+
+	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
+		return NULL;
+
+	if (!epc->ops->get_features)
+		return NULL;
+
+	spin_lock_irqsave(&epc->lock, flags);
+	epc_features = epc->ops->get_features(epc, func_no);
+	spin_unlock_irqrestore(&epc->lock, flags);
+
+	return epc_features;
+}
+EXPORT_SYMBOL_GPL(pci_epc_get_features);
+
 /**
  * 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 37dab8116901..79fbcf94e14d 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -59,6 +59,8 @@ struct pci_epc_ops {
 			     enum pci_epc_irq_type type, u16 interrupt_num);
 	int	(*start)(struct pci_epc *epc);
 	void	(*stop)(struct pci_epc *epc);
+	const struct pci_epc_features* (*get_features)(struct pci_epc *epc,
+						       u8 func_no);
 	struct module *owner;
 };
 
@@ -100,6 +102,24 @@ struct pci_epc {
 	unsigned int			features;
 };
 
+/**
+ * struct pci_epc_features - features supported by a EPC device per function
+ * @linkup_notifier: indicate if the EPC device can notify EPF driver on link up
+ * @msi_capable: indicate if the endpoint function has MSI capability
+ * @msix_capable: indicate if the endpoint function has MSI-X capability
+ * @reserved_bar: bitmap to indicate reserved BAR unavailable to function driver
+ * @bar_fixed_64bit: bitmap to indicate fixed 64bit BARs
+ * @bar_fixed_size: Array specifying the size supported by each BAR
+ */
+struct pci_epc_features {
+	unsigned int	linkup_notifier : 1;
+	unsigned int	msi_capable : 1;
+	unsigned int	msix_capable : 1;
+	u8	reserved_bar;
+	u8	bar_fixed_64bit;
+	u64	bar_fixed_size[BAR_5 + 1];
+};
+
 #define EPC_FEATURE_NO_LINKUP_NOTIFIER		BIT(0)
 #define EPC_FEATURE_BAR_MASK			(BIT(1) | BIT(2) | BIT(3))
 #define EPC_FEATURE_MSIX_AVAILABLE		BIT(4)
@@ -158,6 +178,8 @@ int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no,
 		      enum pci_epc_irq_type type, u16 interrupt_num);
 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);
 struct pci_epc *pci_epc_get(const char *epc_name);
 void pci_epc_put(struct pci_epc *epc);
 
-- 
2.17.1