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/**********************************************************************
* Author: Cavium, Inc.
*
* Contact: support@cavium.com
* Please include "LiquidIO" in the subject.
*
* Copyright (c) 2003-2016 Cavium, Inc.
*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, Version 2, as
* published by the Free Software Foundation.
*
* This file is distributed in the hope that it will be useful, but
* AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
* NONINFRINGEMENT. See the GNU General Public License for more details.
***********************************************************************/
#include <linux/pci.h>
#include <net/vxlan.h>
#include "liquidio_common.h"
#include "octeon_droq.h"
#include "octeon_iq.h"
#include "response_manager.h"
#include "octeon_device.h"
#include "octeon_main.h"
#include "cn23xx_vf_device.h"
MODULE_AUTHOR("Cavium Networks, <support@cavium.com>");
MODULE_DESCRIPTION("Cavium LiquidIO Intelligent Server Adapter Virtual Function Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(LIQUIDIO_VERSION);
struct octeon_device_priv {
/* Tasklet structures for this device. */
struct tasklet_struct droq_tasklet;
unsigned long napi_mask;
};
static int
liquidio_vf_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
static void liquidio_vf_remove(struct pci_dev *pdev);
static int octeon_device_init(struct octeon_device *oct);
static const struct pci_device_id liquidio_vf_pci_tbl[] = {
{
PCI_VENDOR_ID_CAVIUM, OCTEON_CN23XX_VF_VID,
PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0
},
{
0, 0, 0, 0, 0, 0, 0
}
};
MODULE_DEVICE_TABLE(pci, liquidio_vf_pci_tbl);
static struct pci_driver liquidio_vf_pci_driver = {
.name = "LiquidIO_VF",
.id_table = liquidio_vf_pci_tbl,
.probe = liquidio_vf_probe,
.remove = liquidio_vf_remove,
};
/**
* \brief PCI probe handler
* @param pdev PCI device structure
* @param ent unused
*/
static int
liquidio_vf_probe(struct pci_dev *pdev,
const struct pci_device_id *ent __attribute__((unused)))
{
struct octeon_device *oct_dev = NULL;
oct_dev = octeon_allocate_device(pdev->device,
sizeof(struct octeon_device_priv));
if (!oct_dev) {
dev_err(&pdev->dev, "Unable to allocate device\n");
return -ENOMEM;
}
dev_info(&pdev->dev, "Initializing device %x:%x.\n",
(u32)pdev->vendor, (u32)pdev->device);
/* Assign octeon_device for this device to the private data area. */
pci_set_drvdata(pdev, oct_dev);
/* set linux specific device pointer */
oct_dev->pci_dev = pdev;
if (octeon_device_init(oct_dev)) {
liquidio_vf_remove(pdev);
return -ENOMEM;
}
dev_dbg(&oct_dev->pci_dev->dev, "Device is ready\n");
return 0;
}
/**
* \brief PCI FLR for each Octeon device.
* @param oct octeon device
*/
static void octeon_pci_flr(struct octeon_device *oct)
{
u16 status;
pci_save_state(oct->pci_dev);
pci_cfg_access_lock(oct->pci_dev);
/* Quiesce the device completely */
pci_write_config_word(oct->pci_dev, PCI_COMMAND,
PCI_COMMAND_INTX_DISABLE);
/* Wait for Transaction Pending bit clean */
msleep(100);
pcie_capability_read_word(oct->pci_dev, PCI_EXP_DEVSTA, &status);
if (status & PCI_EXP_DEVSTA_TRPND) {
dev_info(&oct->pci_dev->dev, "Function reset incomplete after 100ms, sleeping for 5 seconds\n");
ssleep(5);
pcie_capability_read_word(oct->pci_dev, PCI_EXP_DEVSTA,
&status);
if (status & PCI_EXP_DEVSTA_TRPND)
dev_info(&oct->pci_dev->dev, "Function reset still incomplete after 5s, reset anyway\n");
}
pcie_capability_set_word(oct->pci_dev, PCI_EXP_DEVCTL,
PCI_EXP_DEVCTL_BCR_FLR);
mdelay(100);
pci_cfg_access_unlock(oct->pci_dev);
pci_restore_state(oct->pci_dev);
}
/**
*\brief Destroy resources associated with octeon device
* @param pdev PCI device structure
* @param ent unused
*/
static void octeon_destroy_resources(struct octeon_device *oct)
{
switch (atomic_read(&oct->status)) {
case OCT_DEV_PCI_MAP_DONE:
octeon_unmap_pci_barx(oct, 0);
octeon_unmap_pci_barx(oct, 1);
/* fallthrough */
case OCT_DEV_PCI_ENABLE_DONE:
pci_clear_master(oct->pci_dev);
/* Disable the device, releasing the PCI INT */
pci_disable_device(oct->pci_dev);
/* fallthrough */
case OCT_DEV_BEGIN_STATE:
/* Nothing to be done here either */
break;
}
}
/**
* \brief Cleans up resources at unload time
* @param pdev PCI device structure
*/
static void liquidio_vf_remove(struct pci_dev *pdev)
{
struct octeon_device *oct_dev = pci_get_drvdata(pdev);
dev_dbg(&oct_dev->pci_dev->dev, "Stopping device\n");
/* Reset the octeon device and cleanup all memory allocated for
* the octeon device by driver.
*/
octeon_destroy_resources(oct_dev);
dev_info(&oct_dev->pci_dev->dev, "Device removed\n");
/* This octeon device has been removed. Update the global
* data structure to reflect this. Free the device structure.
*/
octeon_free_device_mem(oct_dev);
}
/**
* \brief PCI initialization for each Octeon device.
* @param oct octeon device
*/
static int octeon_pci_os_setup(struct octeon_device *oct)
{
#ifdef CONFIG_PCI_IOV
/* setup PCI stuff first */
if (!oct->pci_dev->physfn)
octeon_pci_flr(oct);
#endif
if (pci_enable_device(oct->pci_dev)) {
dev_err(&oct->pci_dev->dev, "pci_enable_device failed\n");
return 1;
}
if (dma_set_mask_and_coherent(&oct->pci_dev->dev, DMA_BIT_MASK(64))) {
dev_err(&oct->pci_dev->dev, "Unexpected DMA device capability\n");
pci_disable_device(oct->pci_dev);
return 1;
}
/* Enable PCI DMA Master. */
pci_set_master(oct->pci_dev);
return 0;
}
/**
* \brief Device initialization for each Octeon device that is probed
* @param octeon_dev octeon device
*/
static int octeon_device_init(struct octeon_device *oct)
{
u32 rev_id;
atomic_set(&oct->status, OCT_DEV_BEGIN_STATE);
/* Enable access to the octeon device and make its DMA capability
* known to the OS.
*/
if (octeon_pci_os_setup(oct))
return 1;
atomic_set(&oct->status, OCT_DEV_PCI_ENABLE_DONE);
oct->chip_id = OCTEON_CN23XX_VF_VID;
pci_read_config_dword(oct->pci_dev, 8, &rev_id);
oct->rev_id = rev_id & 0xff;
if (cn23xx_setup_octeon_vf_device(oct))
return 1;
atomic_set(&oct->status, OCT_DEV_PCI_MAP_DONE);
return 0;
}
static int __init liquidio_vf_init(void)
{
octeon_init_device_list(0);
return pci_register_driver(&liquidio_vf_pci_driver);
}
static void __exit liquidio_vf_exit(void)
{
pci_unregister_driver(&liquidio_vf_pci_driver);
pr_info("LiquidIO_VF network module is now unloaded\n");
}
module_init(liquidio_vf_init);
module_exit(liquidio_vf_exit);
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