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Date: Tue, 8 Dec 2020 10:13:17 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: "Jiang, Dave" <dave.jiang@...el.com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Jonathan Corbet <corbet@....net>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Arnd Bergmann <arnd@...db.de>, Jon Mason <jdmason@...zu.us>,
Allen Hubbe <allenbh@...il.com>,
Tom Joseph <tjoseph@...ence.com>, Rob Herring <robh@...nel.org>
CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-ntb@...glegroups.com" <linux-ntb@...glegroups.com>
Subject: Re: [PATCH v8 15/18] NTB: Add support for EPF PCI-Express
Non-Transparent Bridge
Hi Dave,
On 07/12/20 9:27 pm, Jiang, Dave wrote:
>
>
>> -----Original Message-----
>> From: Kishon Vijay Abraham I <kishon@...com>
>> Sent: Wednesday, November 11, 2020 8:36 AM
>> To: Bjorn Helgaas <bhelgaas@...gle.com>; Jonathan Corbet
>> <corbet@....net>; Kishon Vijay Abraham I <kishon@...com>; Lorenzo
>> Pieralisi <lorenzo.pieralisi@....com>; Arnd Bergmann <arnd@...db.de>;
>> Jon Mason <jdmason@...zu.us>; Jiang, Dave <dave.jiang@...el.com>;
>> Allen Hubbe <allenbh@...il.com>; Tom Joseph <tjoseph@...ence.com>;
>> Rob Herring <robh@...nel.org>
>> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>; linux-
>> pci@...r.kernel.org; linux-doc@...r.kernel.org; linux-
>> kernel@...r.kernel.org; linux-ntb@...glegroups.com
>> Subject: [PATCH v8 15/18] NTB: Add support for EPF PCI-Express Non-
>> Transparent Bridge
>>
>> 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 <kishon@...com>
>> ---
>> 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..3855bb0ecacd
>> --- /dev/null
>> +++ b/drivers/ntb/hw/epf/ntb_hw_epf.c
>> @@ -0,0 +1,755 @@
.
.
<snip>
.
.
>> +static void ntb_epf_cleanup_isr(struct ntb_epf_dev *ndev) {
>> + struct pci_dev *pdev = ndev->ntb.pdev;
>> + struct device *dev = &pdev->dev;
>> + int i;
>> +
>> + ntb_epf_send_command(ndev, CMD_TEARDOWN_DOORBELL,
>> ndev->db_count + 1);
>> +
>> + for (i = 0; i < ndev->db_count + 1; i++)
>> + devm_free_irq(dev, pci_irq_vector(pdev, i), ndev);
>
> This is called during shutdown. Does that defeats the purpose of using devm API?
Yeah, here devm_* API is not required since we have to invoke free_irq()
before invoking pci_free_irq_vectors(). Will change this to non devm API.
Thank You,
Kishon
>
> - Dave
>
>> + pci_free_irq_vectors(pdev);
>> +}
>> +
>> +static int ntb_epf_pci_probe(struct pci_dev *pdev,
>> + const struct pci_device_id *id) {
>> + enum pci_barno peer_spad_reg_bar = BAR_1;
>> + enum pci_barno ctrl_reg_bar = BAR_0;
>> + enum pci_barno db_reg_bar = BAR_2;
>> + struct device *dev = &pdev->dev;
>> + struct ntb_epf_data *data;
>> + struct ntb_epf_dev *ndev;
>> + int ret;
>> +
>> + if (pci_is_bridge(pdev))
>> + return -ENODEV;
>> +
>> + ndev = devm_kzalloc(dev, sizeof(*ndev), GFP_KERNEL);
>> + if (!ndev)
>> + return -ENOMEM;
>> +
>> + data = (struct ntb_epf_data *)id->driver_data;
>> + if (data) {
>> + if (data->peer_spad_reg_bar)
>> + peer_spad_reg_bar = data->peer_spad_reg_bar;
>> + if (data->ctrl_reg_bar)
>> + ctrl_reg_bar = data->ctrl_reg_bar;
>> + if (data->db_reg_bar)
>> + db_reg_bar = data->db_reg_bar;
>> + }
>> +
>> + ndev->peer_spad_reg_bar = peer_spad_reg_bar;
>> + ndev->ctrl_reg_bar = ctrl_reg_bar;
>> + ndev->db_reg_bar = db_reg_bar;
>> + ndev->dev = dev;
>> +
>> + ntb_epf_init_struct(ndev, pdev);
>> + mutex_init(&ndev->cmd_lock);
>> +
>> + ret = ntb_epf_init_pci(ndev, pdev);
>> + if (ret) {
>> + dev_err(dev, "Failed to init PCI\n");
>> + return ret;
>> + }
>> +
>> + ret = ntb_epf_init_dev(ndev);
>> + if (ret) {
>> + dev_err(dev, "Failed to init device\n");
>> + goto err_init_dev;
>> + }
>> +
>> + ret = ntb_register_device(&ndev->ntb);
>> + if (ret) {
>> + dev_err(dev, "Failed to register NTB device\n");
>> + goto err_register_dev;
>> + }
>> +
>> + return 0;
>> +
>> +err_register_dev:
>> + ntb_epf_cleanup_isr(ndev);
>> +
>> +err_init_dev:
>> + ntb_epf_deinit_pci(ndev);
>> +
>> + return ret;
>> +}
>> +
>> +static void ntb_epf_pci_remove(struct pci_dev *pdev) {
>> + struct ntb_epf_dev *ndev = pci_get_drvdata(pdev);
>> +
>> + ntb_unregister_device(&ndev->ntb);
>> + ntb_epf_cleanup_isr(ndev);
>> + ntb_epf_deinit_pci(ndev);
>> + kfree(ndev);
>> +}
>> +
>> +static const struct ntb_epf_data j721e_data = {
>> + .ctrl_reg_bar = BAR_0,
>> + .peer_spad_reg_bar = BAR_1,
>> + .db_reg_bar = BAR_2,
>> +};
>> +
>> +static const struct pci_device_id ntb_epf_pci_tbl[] = {
>> + {
>> + PCI_DEVICE(PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_J721E),
>> + .class = PCI_CLASS_MEMORY_RAM << 8, .class_mask =
>> 0xffff00,
>> + .driver_data = (kernel_ulong_t)&j721e_data,
>> + },
>> + { },
>> +};
>> +
>> +static struct pci_driver ntb_epf_pci_driver = {
>> + .name = KBUILD_MODNAME,
>> + .id_table = ntb_epf_pci_tbl,
>> + .probe = ntb_epf_pci_probe,
>> + .remove = ntb_epf_pci_remove,
>> +};
>> +module_pci_driver(ntb_epf_pci_driver);
>> +
>> +MODULE_DESCRIPTION("PCI ENDPOINT NTB HOST DRIVER");
>> +MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@...com>");
>> +MODULE_LICENSE("GPL v2");
>> --
>> 2.17.1
>
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