diff options
Diffstat (limited to 'drivers/net/ethernet/netronome/nfp/nfpcore/nfp_rtsym.c')
-rw-r--r-- | drivers/net/ethernet/netronome/nfp/nfpcore/nfp_rtsym.c | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_rtsym.c b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_rtsym.c new file mode 100644 index 000000000000..0e3870ecfb8c --- /dev/null +++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_rtsym.c @@ -0,0 +1,306 @@ +/* + * 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) { + err = -ENOENT; + goto exit; + } + + 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; +exit: + if (error) + *error = err; + + if (err) + return ~0ULL; + return val; +} |