Commit 5f30fe4d authored by Jakub Kicinski's avatar Jakub Kicinski Committed by David S. Miller
Browse files

nfp: add rtsym support 



Add support for using application FW symbol table to look up
location of information in device memory.

Signed-off-by: default avatarJakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ab78c1d2

drivers/net/ethernet/netronome/nfp/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ nfp-objs := \ 
	    nfpcore/nfp_mip.o \

	    nfpcore/nfp_nffw.o \

	    nfpcore/nfp_resource.o \

	    nfpcore/nfp_rtsym.o \

	    nfpcore/nfp_target.o \

	    nfp_main.o \

	    nfp_net_common.o \

drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cpp.h

+2 −0
Original line number Diff line number Diff line
@@ -221,6 +221,8 @@ int nfp_cpp_serial(struct nfp_cpp *cpp, const u8 **serial); 


void *nfp_hwinfo_cache(struct nfp_cpp *cpp);

void nfp_hwinfo_cache_set(struct nfp_cpp *cpp, void *val);

void *nfp_rtsym_cache(struct nfp_cpp *cpp);

void nfp_rtsym_cache_set(struct nfp_cpp *cpp, void *val);



struct nfp_cpp_area *nfp_cpp_area_alloc_with_name(struct nfp_cpp *cpp,

						  u32 cpp_id,

drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c

+12 −0
Original line number Diff line number Diff line
@@ -99,6 +99,7 @@ struct nfp_cpp { 


	/* Cached information */

	void *hwinfo;

	void *rtsym;

};



/* Element of the area_cache_list */
@@ -241,6 +242,7 @@ void nfp_cpp_free(struct nfp_cpp *cpp) 
		cpp->op->free(cpp);



	kfree(cpp->hwinfo);

	kfree(cpp->rtsym);



	device_unregister(&cpp->dev);
@@ -292,6 +294,16 @@ void nfp_hwinfo_cache_set(struct nfp_cpp *cpp, void *val) 
	cpp->hwinfo = val;

}



void *nfp_rtsym_cache(struct nfp_cpp *cpp)

{

	return cpp->rtsym;

}



void nfp_rtsym_cache_set(struct nfp_cpp *cpp, void *val)

{

	cpp->rtsym = val;

}



/**

 * nfp_cpp_area_alloc_with_name() - allocate a new CPP area

 * @cpp:	CPP device handle

drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nffw.h

+34 −0
Original line number Diff line number Diff line
@@ -58,4 +58,38 @@ void nfp_mip_close(const struct nfp_mip *mip); 
void nfp_mip_symtab(const struct nfp_mip *mip, u32 *addr, u32 *size);

void nfp_mip_strtab(const struct nfp_mip *mip, u32 *addr, u32 *size);



/* Implemented in nfp_rtsym.c */



#define NFP_RTSYM_TYPE_NONE		0

#define NFP_RTSYM_TYPE_OBJECT		1

#define NFP_RTSYM_TYPE_FUNCTION		2

#define NFP_RTSYM_TYPE_ABS		3



#define NFP_RTSYM_TARGET_NONE		0

#define NFP_RTSYM_TARGET_LMEM		-1

#define NFP_RTSYM_TARGET_EMU_CACHE	-7



/**

 * struct nfp_rtsym - RTSYM descriptor

 * @name:	Symbol name

 * @addr:	Address in the domain/target's address space

 * @size:	Size (in bytes) of the symbol

 * @type:	NFP_RTSYM_TYPE_* of the symbol

 * @target:	CPP Target identifier, or NFP_RTSYM_TARGET_*

 * @domain:	CPP Target Domain (island)

 */

struct nfp_rtsym {

	const char *name;

	u64 addr;

	u64 size;

	int type;

	int target;

	int domain;

};



int nfp_rtsym_count(struct nfp_cpp *cpp);

const struct nfp_rtsym *nfp_rtsym_get(struct nfp_cpp *cpp, int idx);

const struct nfp_rtsym *nfp_rtsym_lookup(struct nfp_cpp *cpp, const char *name);

u64 nfp_rtsym_read_le(struct nfp_cpp *cpp, const char *name, int *error);



#endif /* NFP_NFFW_H */

drivers/net/ethernet/netronome/nfp/nfpcore/nfp_rtsym.c

0 → 100644
+304 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2015-2017 Netronome Systems, Inc.

 *

 * This software is dual licensed under the GNU General License Version 2,

 * June 1991 as shown in the file COPYING in the top-level directory of this

 * source tree or the BSD 2-Clause License provided below.  You have the

 * option to license this software under the complete terms of either license.

 *

 * The BSD 2-Clause License:

 *

 *     Redistribution and use in source and binary forms, with or

 *     without modification, are permitted provided that the following

 *     conditions are met:

 *

 *      1. Redistributions of source code must retain the above

 *         copyright notice, this list of conditions and the following

 *         disclaimer.

 *

 *      2. Redistributions in binary form must reproduce the above

 *         copyright notice, this list of conditions and the following

 *         disclaimer in the documentation and/or other materials

 *         provided with the distribution.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS

 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN

 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

 * SOFTWARE.

 */



/*

 * nfp_rtsym.c

 * Interface for accessing run-time symbol table

 * Authors: Jakub Kicinski <jakub.kicinski@netronome.com>

 *          Jason McMullan <jason.mcmullan@netronome.com>

 *          Espen Skoglund <espen.skoglund@netronome.com>

 *          Francois H. Theron <francois.theron@netronome.com>

 */

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/io-64-nonatomic-hi-lo.h>



#include "nfp.h"

#include "nfp_cpp.h"

#include "nfp_nffw.h"

#include "nfp6000/nfp6000.h"



/* These need to match the linker */

#define SYM_TGT_LMEM		0

#define SYM_TGT_EMU_CACHE	0x17



struct nfp_rtsym_entry {

	u8	type;

	u8	target;

	u8	island;

	u8	addr_hi;

	__le32	addr_lo;

	__le16	name;

	u8	menum;

	u8	size_hi;

	__le32	size_lo;

};



struct nfp_rtsym_cache {

	int num;

	char *strtab;

	struct nfp_rtsym symtab[];

};



static int nfp_meid(u8 island_id, u8 menum)

{

	return (island_id & 0x3F) == island_id && menum < 12 ?

		(island_id << 4) | (menum + 4) : -1;

}



static void

nfp_rtsym_sw_entry_init(struct nfp_rtsym_cache *cache, u32 strtab_size,

			struct nfp_rtsym *sw, struct nfp_rtsym_entry *fw)

{

	sw->type = fw->type;

	sw->name = cache->strtab + le16_to_cpu(fw->name) % strtab_size;

	sw->addr = ((u64)fw->addr_hi << 32) | le32_to_cpu(fw->addr_lo);

	sw->size = ((u64)fw->size_hi << 32) | le32_to_cpu(fw->size_lo);



	switch (fw->target) {

	case SYM_TGT_LMEM:

		sw->target = NFP_RTSYM_TARGET_LMEM;

		break;

	case SYM_TGT_EMU_CACHE:

		sw->target = NFP_RTSYM_TARGET_EMU_CACHE;

		break;

	default:

		sw->target = fw->target;

		break;

	}



	if (fw->menum != 0xff)

		sw->domain = nfp_meid(fw->island, fw->menum);

	else if (fw->island != 0xff)

		sw->domain = fw->island;

	else

		sw->domain = -1;

}



static int nfp_rtsymtab_probe(struct nfp_cpp *cpp)

{

	const u32 dram = NFP_CPP_ID(NFP_CPP_TARGET_MU, NFP_CPP_ACTION_RW, 0) |

		NFP_ISL_EMEM0;

	u32 strtab_addr, symtab_addr, strtab_size, symtab_size;

	struct nfp_rtsym_entry *rtsymtab;

	struct nfp_rtsym_cache *cache;

	const struct nfp_mip *mip;

	int err, n, size;



	mip = nfp_mip_open(cpp);

	if (!mip)

		return -EIO;



	nfp_mip_strtab(mip, &strtab_addr, &strtab_size);

	nfp_mip_symtab(mip, &symtab_addr, &symtab_size);

	nfp_mip_close(mip);



	if (!symtab_size || !strtab_size || symtab_size % sizeof(*rtsymtab))

		return -ENXIO;



	/* Align to 64 bits */

	symtab_size = round_up(symtab_size, 8);

	strtab_size = round_up(strtab_size, 8);



	rtsymtab = kmalloc(symtab_size, GFP_KERNEL);

	if (!rtsymtab)

		return -ENOMEM;



	size = sizeof(*cache);

	size += symtab_size / sizeof(*rtsymtab) * sizeof(struct nfp_rtsym);

	size +=	strtab_size + 1;

	cache = kmalloc(size, GFP_KERNEL);

	if (!cache) {

		err = -ENOMEM;

		goto err_free_rtsym_raw;

	}



	cache->num = symtab_size / sizeof(*rtsymtab);

	cache->strtab = (void *)&cache->symtab[cache->num];



	err = nfp_cpp_read(cpp, dram, symtab_addr, rtsymtab, symtab_size);

	if (err != symtab_size)

		goto err_free_cache;



	err = nfp_cpp_read(cpp, dram, strtab_addr, cache->strtab, strtab_size);

	if (err != strtab_size)

		goto err_free_cache;

	cache->strtab[strtab_size] = '\0';



	for (n = 0; n < cache->num; n++)

		nfp_rtsym_sw_entry_init(cache, strtab_size,

					&cache->symtab[n], &rtsymtab[n]);



	kfree(rtsymtab);

	nfp_rtsym_cache_set(cpp, cache);

	return 0;



err_free_cache:

	kfree(cache);

err_free_rtsym_raw:

	kfree(rtsymtab);

	return err;

}



static struct nfp_rtsym_cache *nfp_rtsym(struct nfp_cpp *cpp)

{

	struct nfp_rtsym_cache *cache;

	int err;



	cache = nfp_rtsym_cache(cpp);

	if (cache)

		return cache;



	err = nfp_rtsymtab_probe(cpp);

	if (err < 0)

		return ERR_PTR(err);



	return nfp_rtsym_cache(cpp);

}



/**

 * nfp_rtsym_count() - Get the number of RTSYM descriptors

 * @cpp:	NFP CPP handle

 *

 * Return: Number of RTSYM descriptors, or -ERRNO

 */

int nfp_rtsym_count(struct nfp_cpp *cpp)

{

	struct nfp_rtsym_cache *cache;



	cache = nfp_rtsym(cpp);

	if (IS_ERR(cache))

		return PTR_ERR(cache);



	return cache->num;

}



/**

 * nfp_rtsym_get() - Get the Nth RTSYM descriptor

 * @cpp:	NFP CPP handle

 * @idx:	Index (0-based) of the RTSYM descriptor

 *

 * Return: const pointer to a struct nfp_rtsym descriptor, or NULL

 */

const struct nfp_rtsym *nfp_rtsym_get(struct nfp_cpp *cpp, int idx)

{

	struct nfp_rtsym_cache *cache;



	cache = nfp_rtsym(cpp);

	if (IS_ERR(cache))

		return NULL;



	if (idx >= cache->num)

		return NULL;



	return &cache->symtab[idx];

}



/**

 * nfp_rtsym_lookup() - Return the RTSYM descriptor for a symbol name

 * @cpp:	NFP CPP handle

 * @name:	Symbol name

 *

 * Return: const pointer to a struct nfp_rtsym descriptor, or NULL

 */

const struct nfp_rtsym *nfp_rtsym_lookup(struct nfp_cpp *cpp, const char *name)

{

	struct nfp_rtsym_cache *cache;

	int n;



	cache = nfp_rtsym(cpp);

	if (IS_ERR(cache))

		return NULL;



	for (n = 0; n < cache->num; n++) {

		if (strcmp(name, cache->symtab[n].name) == 0)

			return &cache->symtab[n];

	}



	return NULL;

}



/**

 * nfp_rtsym_read_le() - Read a simple unsigned scalar value from symbol

 * @cpp:	NFP CPP handle

 * @name:	Symbol name

 * @error:	Poniter to error code (optional)

 *

 * Lookup a symbol, map, read it and return it's value. Value of the symbol

 * will be interpreted as a simple little-endian unsigned value. Symbol can

 * be 4 or 8 bytes in size.

 *

 * Return: value read, on error sets the error and returns ~0ULL.

 */

u64 nfp_rtsym_read_le(struct nfp_cpp *cpp, const char *name, int *error)

{

	const struct nfp_rtsym *sym;

	u32 val32, id;

	u64 val;

	int err;



	sym = nfp_rtsym_lookup(cpp, name);

	if (!sym)

		return -ENOENT;



	id = NFP_CPP_ISLAND_ID(sym->target, NFP_CPP_ACTION_RW, 0, sym->domain);



	switch (sym->size) {

	case 4:

		err = nfp_cpp_readl(cpp, id, sym->addr, &val32);

		val = val32;

		break;

	case 8:

		err = nfp_cpp_readq(cpp, id, sym->addr, &val);

		break;

	default:

		nfp_err(cpp,

			"rtsym '%s' unsupported or non-scalar size: %lld\n",

			name, sym->size);

		err = -EINVAL;

		break;

	}



	if (err == sym->size)

		err = 0;

	else if (err >= 0)

		err = -EIO;



	if (error)

		*error = err;



	if (err)

		return ~0ULL;

	return val;

}