Thread (36 messages) 36 messages, 4 authors, 2020-11-16

RE: [PATCH v7 15/18] NTB: Add support for EPF PCI-Express Non-Transparent Bridge

From: Sherry Sun <hidden>
Date: 2020-11-09 09:37:07
Also in: linux-pci, lkml

Hi Kishon,
quoted hunk ↗ jump to hunk
Subject: [PATCH v7 15/18] NTB: Add support for EPF PCI-Express Non-
Transparent Bridge

From: Kishon Vijay Abraham I <redacted>

Add support for EPF PCI-Express Non-Transparent Bridge (NTB) device.
This driver is platform independent and could be used by any platform which
have multiple PCIe endpoint instances configured using the pci-epf-ntb driver.
The driver connnects to the standard NTB sub-system interface. The EPF NTB
device has configurable number of memory windows (Max 4), configurable
number of doorbell (Max 32), and configurable number of scratch-pad
registers.

Signed-off-by: Kishon Vijay Abraham I <redacted>
---
 drivers/ntb/hw/Kconfig          |   1 +
 drivers/ntb/hw/Makefile         |   1 +
 drivers/ntb/hw/epf/Kconfig      |   6 +
 drivers/ntb/hw/epf/Makefile     |   1 +
 drivers/ntb/hw/epf/ntb_hw_epf.c | 755
++++++++++++++++++++++++++++++++
 5 files changed, 764 insertions(+)
 create mode 100644 drivers/ntb/hw/epf/Kconfig  create mode 100644
drivers/ntb/hw/epf/Makefile  create mode 100644
drivers/ntb/hw/epf/ntb_hw_epf.c
diff --git a/drivers/ntb/hw/Kconfig b/drivers/ntb/hw/Kconfig index
e77c587060ff..c325be526b80 100644
--- a/drivers/ntb/hw/Kconfig
+++ b/drivers/ntb/hw/Kconfig
@@ -2,4 +2,5 @@
 source "drivers/ntb/hw/amd/Kconfig"
 source "drivers/ntb/hw/idt/Kconfig"
 source "drivers/ntb/hw/intel/Kconfig"
+source "drivers/ntb/hw/epf/Kconfig"
 source "drivers/ntb/hw/mscc/Kconfig"
diff --git a/drivers/ntb/hw/Makefile b/drivers/ntb/hw/Makefile index
4714d6238845..223ca592b5f9 100644
--- a/drivers/ntb/hw/Makefile
+++ b/drivers/ntb/hw/Makefile
@@ -2,4 +2,5 @@
 obj-$(CONFIG_NTB_AMD)	+= amd/
 obj-$(CONFIG_NTB_IDT)	+= idt/
 obj-$(CONFIG_NTB_INTEL)	+= intel/
+obj-$(CONFIG_NTB_EPF)	+= epf/
 obj-$(CONFIG_NTB_SWITCHTEC) += mscc/
diff --git a/drivers/ntb/hw/epf/Kconfig b/drivers/ntb/hw/epf/Kconfig new
file mode 100644 index 000000000000..6197d1aab344
--- /dev/null
+++ b/drivers/ntb/hw/epf/Kconfig
@@ -0,0 +1,6 @@
+config NTB_EPF
+	tristate "Generic EPF Non-Transparent Bridge support"
+	depends on m
+	help
+	  This driver supports EPF NTB on configurable endpoint.
+	  If unsure, say N.
diff --git a/drivers/ntb/hw/epf/Makefile b/drivers/ntb/hw/epf/Makefile new
file mode 100644 index 000000000000..2f560a422bc6
--- /dev/null
+++ b/drivers/ntb/hw/epf/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_NTB_EPF) += ntb_hw_epf.o
diff --git a/drivers/ntb/hw/epf/ntb_hw_epf.c
b/drivers/ntb/hw/epf/ntb_hw_epf.c new file mode 100644 index
000000000000..0a144987851a
--- /dev/null
+++ b/drivers/ntb/hw/epf/ntb_hw_epf.c
@@ -0,0 +1,755 @@
......
+static int ntb_epf_init_pci(struct ntb_epf_dev *ndev,
+			    struct pci_dev *pdev)
+{
+	struct device *dev = ndev->dev;
+	int ret;
+
+	pci_set_drvdata(pdev, ndev);
+
+	ret = pci_enable_device(pdev);
+	if (ret) {
+		dev_err(dev, "Cannot enable PCI device\n");
+		goto err_pci_enable;
+	}
+
+	ret = pci_request_regions(pdev, "ntb");
+	if (ret) {
+		dev_err(dev, "Cannot obtain PCI resources\n");
+		goto err_pci_regions;
+	}
+
+	pci_set_master(pdev);
+
+	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
+	if (ret) {
+		ret = dma_set_mask_and_coherent(dev,
DMA_BIT_MASK(32));
+		if (ret) {
+			dev_err(dev, "Cannot set DMA mask\n");
+			goto err_dma_mask;
+		}
+		dev_warn(&pdev->dev, "Cannot DMA highmem\n");
+	}
+
+	ndev->ctrl_reg = pci_iomap(pdev, 0, 0);
The second parameter of pci_iomap should be ndev->ctrl_reg_bar instead of the hardcode value 0, right?
+	if (!ndev->ctrl_reg) {
+		ret = -EIO;
+		goto err_dma_mask;
+	}
+
+	ndev->peer_spad_reg = pci_iomap(pdev, 1, 0);
pci_iomap(pdev, ndev->peer_spad_reg_bar, 0);
+	if (!ndev->peer_spad_reg) {
+		ret = -EIO;
+		goto err_dma_mask;
+	}
+
+	ndev->db_reg = pci_iomap(pdev, 2, 0);
pci_iomap(pdev, ndev->db_reg_bar, 0);

Best Regards
Sherry
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