Commit 55435ea7 authored by Shannon Nelson's avatar Shannon Nelson Committed by David S. Miller
Browse files

pds_core: initial framework for pds_core PF driver 



This is the initial PCI driver framework for the new pds_core device
driver and its family of devices.  This does the very basics of
registering for the new PF PCI device 1dd8:100c, setting up debugfs
entries, and registering with devlink.

Signed-off-by: default avatarShannon Nelson <shannon.nelson@amd.com>
Acked-by: default avatarJakub Kicinski <kuba@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 25c800b2

Documentation/networking/device_drivers/ethernet/amd/pds_core.rst

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.. SPDX-License-Identifier: GPL-2.0+



========================================================

Linux Driver for the AMD/Pensando(R) DSC adapter family

========================================================



Copyright(c) 2023 Advanced Micro Devices, Inc



Identifying the Adapter

=======================



To find if one or more AMD/Pensando PCI Core devices are installed on the

host, check for the PCI devices::



  # lspci -d 1dd8:100c

  b5:00.0 Processing accelerators: Pensando Systems Device 100c

  b6:00.0 Processing accelerators: Pensando Systems Device 100c



If such devices are listed as above, then the pds_core.ko driver should find

and configure them for use.  There should be log entries in the kernel

messages such as these::



  $ dmesg | grep pds_core

  pds_core 0000:b5:00.0: 252.048 Gb/s available PCIe bandwidth (16.0 GT/s PCIe x16 link)

  pds_core 0000:b5:00.0: FW: 1.60.0-73

  pds_core 0000:b6:00.0: 252.048 Gb/s available PCIe bandwidth (16.0 GT/s PCIe x16 link)

  pds_core 0000:b6:00.0: FW: 1.60.0-73



Support

=======



For general Linux networking support, please use the netdev mailing

list, which is monitored by AMD/Pensando personnel::



  netdev@vger.kernel.org

Documentation/networking/device_drivers/ethernet/index.rst

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@@ -14,6 +14,7 @@ Contents: 
   3com/vortex

   amazon/ena

   altera/altera_tse

   amd/pds_core

   aquantia/atlantic

   chelsio/cxgb

   cirrus/cs89x0

drivers/net/ethernet/amd/pds_core/Makefile

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# SPDX-License-Identifier: GPL-2.0

# Copyright (c) 2023 Advanced Micro Devices, Inc.



obj-$(CONFIG_PDS_CORE) := pds_core.o



pds_core-y := main.o



pds_core-$(CONFIG_DEBUG_FS) += debugfs.o

drivers/net/ethernet/amd/pds_core/core.h

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/* SPDX-License-Identifier: GPL-2.0 */

/* Copyright(c) 2023 Advanced Micro Devices, Inc */



#ifndef _PDSC_H_

#define _PDSC_H_



#include <linux/debugfs.h>

#include <net/devlink.h>



#include <linux/pds/pds_common.h>

#include <linux/pds/pds_core_if.h>



#define PDSC_DRV_DESCRIPTION	"AMD/Pensando Core Driver"



struct pdsc_dev_bar {

	void __iomem *vaddr;

	phys_addr_t bus_addr;

	unsigned long len;

	int res_index;

};



/* No state flags set means we are in a steady running state */

enum pdsc_state_flags {

	PDSC_S_FW_DEAD,		    /* stopped, wait on startup or recovery */

	PDSC_S_INITING_DRIVER,	    /* initial startup from probe */

	PDSC_S_STOPPING_DRIVER,	    /* driver remove */



	/* leave this as last */

	PDSC_S_STATE_SIZE

};



struct pdsc {

	struct pci_dev *pdev;

	struct dentry *dentry;

	struct device *dev;

	struct pdsc_dev_bar bars[PDS_CORE_BARS_MAX];

	int hw_index;

	int uid;



	unsigned long state;



	struct pds_core_dev_info_regs __iomem *info_regs;

	struct pds_core_dev_cmd_regs __iomem *cmd_regs;

	struct pds_core_intr __iomem *intr_ctrl;

	u64 __iomem *intr_status;

	u64 __iomem *db_pages;

	dma_addr_t phy_db_pages;

	u64 __iomem *kern_dbpage;

};



void pdsc_debugfs_create(void);

void pdsc_debugfs_destroy(void);

void pdsc_debugfs_add_dev(struct pdsc *pdsc);

void pdsc_debugfs_del_dev(struct pdsc *pdsc);



#endif /* _PDSC_H_ */

drivers/net/ethernet/amd/pds_core/debugfs.c

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// SPDX-License-Identifier: GPL-2.0

/* Copyright(c) 2023 Advanced Micro Devices, Inc */



#include <linux/pci.h>



#include "core.h"



static struct dentry *pdsc_dir;



void pdsc_debugfs_create(void)

{

	pdsc_dir = debugfs_create_dir(PDS_CORE_DRV_NAME, NULL);

}



void pdsc_debugfs_destroy(void)

{

	debugfs_remove_recursive(pdsc_dir);

}



void pdsc_debugfs_add_dev(struct pdsc *pdsc)

{

	pdsc->dentry = debugfs_create_dir(pci_name(pdsc->pdev), pdsc_dir);



	debugfs_create_ulong("state", 0400, pdsc->dentry, &pdsc->state);

}



void pdsc_debugfs_del_dev(struct pdsc *pdsc)

{

	debugfs_remove_recursive(pdsc->dentry);

	pdsc->dentry = NULL;

}