linux-kernel - [PATCH 07/15] PCI: endpoint: Add helper to get first unreserved BAR

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20190107064148.10152-8-kishon@ti.com>
Date:   Mon, 7 Jan 2019 12:11:40 +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 07/15] PCI: endpoint: Add helper to get first unreserved BAR

Add a helper function pci_epc_get_first_free_bar(), to get the first
unreserved BAR that can be used for endpoint function.

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/pci/endpoint/pci-epc-core.c | 22 ++++++++++++++++++++++
 include/linux/pci-epc.h             |  1 +
 2 files changed, 23 insertions(+)

diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index 5a099479d9ab..b1632f91e33e 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -83,6 +83,28 @@ struct pci_epc *pci_epc_get(const char *epc_name)
 }
 EXPORT_SYMBOL_GPL(pci_epc_get);
 
+/**
+ * pci_epc_get_first_free_bar() - helper to get first unreserved BAR
+ * @epc_features: pci_epc_features structure that holds the reserved bar bitmap
+ *
+ * Invoke to get the first unreserved BAR that can be used for endpoint
+ * function.
+ */
+int pci_epc_get_first_free_bar(const struct pci_epc_features *epc_features)
+{
+	int free_bar;
+
+	if (!epc_features)
+		return 0;
+
+	free_bar = ffz(epc_features->reserved_bar);
+	if (free_bar <= 0 || free_bar > 6)
+		return -EINVAL;
+
+	return free_bar;
+}
+EXPORT_SYMBOL_GPL(pci_epc_get_first_free_bar);
+
 /**
  * pci_epc_get_features() - get the features supported by EPC
  * @epc: the features supported by *this* EPC device will be returned
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index 79fbcf94e14d..dc3513a2f88a 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -180,6 +180,7 @@ 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);
+int pci_epc_get_first_free_bar(const struct pci_epc_features *epc_features);
 struct pci_epc *pci_epc_get(const char *epc_name);
 void pci_epc_put(struct pci_epc *epc);
 
-- 
2.17.1