diff options
5 files changed, 341 insertions, 0 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/Makefile b/drivers/net/ethernet/netronome/nfp/Makefile index 47010b7d3efa..e9177f04f67b 100644 --- a/drivers/net/ethernet/netronome/nfp/Makefile +++ b/drivers/net/ethernet/netronome/nfp/Makefile @@ -4,6 +4,7 @@ nfp-objs := \ nfpcore/nfp6000_pcie.o \ nfpcore/nfp_cppcore.o \ nfpcore/nfp_cpplib.o \ + nfpcore/nfp_hwinfo.o \ nfpcore/nfp_resource.o \ nfpcore/nfp_target.o \ nfp_main.o \ diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp.h b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp.h index 1aa57161f23e..1eae3e1e5fbe 100644 --- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp.h +++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp.h @@ -43,6 +43,10 @@ #include "nfp_cpp.h" +/* Implemented in nfp_hwinfo.c */ + +const char *nfp_hwinfo_lookup(struct nfp_cpp *cpp, const char *lookup); + /* Implemented in nfp_resource.c */ #define NFP_RESOURCE_TBL_TARGET NFP_CPP_TARGET_MU diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cpp.h b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cpp.h index f49f12a15669..1798ece689f7 100644 --- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cpp.h +++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cpp.h @@ -219,6 +219,9 @@ u32 nfp_cpp_model(struct nfp_cpp *cpp); u16 nfp_cpp_interface(struct nfp_cpp *cpp); 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); + struct nfp_cpp_area *nfp_cpp_area_alloc_with_name(struct nfp_cpp *cpp, u32 cpp_id, const char *name, diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c index 8e3322022322..aa94780f4dc7 100644 --- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c +++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c @@ -96,6 +96,9 @@ struct nfp_cpp { /* Cached areas for cpp/xpb readl/writel speedups */ struct mutex area_cache_mutex; /* Lock for the area cache */ struct list_head area_cache_list; + + /* Cached information */ + void *hwinfo; }; /* Element of the area_cache_list */ @@ -237,6 +240,8 @@ void nfp_cpp_free(struct nfp_cpp *cpp) if (cpp->op->free) cpp->op->free(cpp); + kfree(cpp->hwinfo); + device_unregister(&cpp->dev); kfree(cpp); @@ -277,6 +282,16 @@ int nfp_cpp_serial(struct nfp_cpp *cpp, const u8 **serial) return sizeof(cpp->serial); } +void *nfp_hwinfo_cache(struct nfp_cpp *cpp) +{ + return cpp->hwinfo; +} + +void nfp_hwinfo_cache_set(struct nfp_cpp *cpp, void *val) +{ + cpp->hwinfo = val; +} + /** * nfp_cpp_area_alloc_with_name() - allocate a new CPP area * @cpp: CPP device handle diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_hwinfo.c b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_hwinfo.c new file mode 100644 index 000000000000..8d8f311ffa6e --- /dev/null +++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_hwinfo.c @@ -0,0 +1,318 @@ +/* + * 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. + */ + +/* Parse the hwinfo table that the ARM firmware builds in the ARM scratch SRAM + * after chip reset. + * + * Examples of the fields: + * me.count = 40 + * me.mask = 0x7f_ffff_ffff + * + * me.count is the total number of MEs on the system. + * me.mask is the bitmask of MEs that are available for application usage. + * + * (ie, in this example, ME 39 has been reserved by boardconfig.) + */ + +#include <asm/byteorder.h> +#include <asm/unaligned.h> +#include <linux/delay.h> +#include <linux/log2.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> + +#define NFP_SUBSYS "nfp_hwinfo" + +#include "crc32.h" +#include "nfp.h" +#include "nfp_cpp.h" +#include "nfp6000/nfp6000.h" + +#define HWINFO_SIZE_MIN 0x100 +#define HWINFO_WAIT 20 /* seconds */ + +/* The Hardware Info Table defines the properties of the system. + * + * HWInfo v1 Table (fixed size) + * + * 0x0000: u32 version Hardware Info Table version (1.0) + * 0x0004: u32 size Total size of the table, including + * the CRC32 (IEEE 802.3) + * 0x0008: u32 jumptab Offset of key/value table + * 0x000c: u32 keys Total number of keys in the key/value table + * NNNNNN: Key/value jump table and string data + * (size - 4): u32 crc32 CRC32 (same as IEEE 802.3, POSIX csum, etc) + * CRC32("",0) = ~0, CRC32("a",1) = 0x48C279FE + * + * HWInfo v2 Table (variable size) + * + * 0x0000: u32 version Hardware Info Table version (2.0) + * 0x0004: u32 size Current size of the data area, excluding CRC32 + * 0x0008: u32 limit Maximum size of the table + * 0x000c: u32 reserved Unused, set to zero + * NNNNNN: Key/value data + * (size - 4): u32 crc32 CRC32 (same as IEEE 802.3, POSIX csum, etc) + * CRC32("",0) = ~0, CRC32("a",1) = 0x48C279FE + * + * If the HWInfo table is in the process of being updated, the low bit + * of version will be set. + * + * HWInfo v1 Key/Value Table + * ------------------------- + * + * The key/value table is a set of offsets to ASCIIZ strings which have + * been strcmp(3) sorted (yes, please use bsearch(3) on the table). + * + * All keys are guaranteed to be unique. + * + * N+0: u32 key_1 Offset to the first key + * N+4: u32 val_1 Offset to the first value + * N+8: u32 key_2 Offset to the second key + * N+c: u32 val_2 Offset to the second value + * ... + * + * HWInfo v2 Key/Value Table + * ------------------------- + * + * Packed UTF8Z strings, ie 'key1\000value1\000key2\000value2\000' + * + * Unsorted. + */ + +#define NFP_HWINFO_VERSION_1 ('H' << 24 | 'I' << 16 | 1 << 8 | 0 << 1 | 0) +#define NFP_HWINFO_VERSION_2 ('H' << 24 | 'I' << 16 | 2 << 8 | 0 << 1 | 0) +#define NFP_HWINFO_VERSION_UPDATING BIT(0) + +struct nfp_hwinfo { + u8 start[0]; + + __le32 version; + __le32 size; + + /* v2 specific fields */ + __le32 limit; + __le32 resv; + + char data[]; +}; + +static bool nfp_hwinfo_is_updating(struct nfp_hwinfo *hwinfo) +{ + return le32_to_cpu(hwinfo->version) & NFP_HWINFO_VERSION_UPDATING; +} + +static int +hwinfo_db_walk(struct nfp_cpp *cpp, struct nfp_hwinfo *hwinfo, u32 size) +{ + const char *key, *val, *end = hwinfo->data + size; + + for (key = hwinfo->data; *key && key < end; + key = val + strlen(val) + 1) { + + val = key + strlen(key) + 1; + if (val >= end) { + nfp_warn(cpp, "Bad HWINFO - overflowing key\n"); + return -EINVAL; + } + + if (val + strlen(val) + 1 > end) { + nfp_warn(cpp, "Bad HWINFO - overflowing value\n"); + return -EINVAL; + } + } + + return 0; +} + +static int +hwinfo_db_validate(struct nfp_cpp *cpp, struct nfp_hwinfo *db, u32 len) +{ + u32 size, crc; + + size = le32_to_cpu(db->size); + if (size > len) { + nfp_err(cpp, "Unsupported hwinfo size %u > %u\n", size, len); + return -EINVAL; + } + + size -= sizeof(u32); + crc = crc32_posix(db, size); + if (crc != get_unaligned_le32(db->start + size)) { + nfp_err(cpp, "Corrupt hwinfo table (CRC mismatch), calculated 0x%x, expected 0x%x\n", + crc, get_unaligned_le32(db->start + size)); + + return -EINVAL; + } + + return hwinfo_db_walk(cpp, db, size); +} + +static int hwinfo_try_fetch(struct nfp_cpp *cpp, size_t *cpp_size) +{ + struct nfp_hwinfo *header; + struct nfp_resource *res; + u64 cpp_addr; + u32 cpp_id; + int err; + u8 *db; + + res = nfp_resource_acquire(cpp, NFP_RESOURCE_NFP_HWINFO); + if (!IS_ERR(res)) { + cpp_id = nfp_resource_cpp_id(res); + cpp_addr = nfp_resource_address(res); + *cpp_size = nfp_resource_size(res); + + nfp_resource_release(res); + + if (*cpp_size < HWINFO_SIZE_MIN) + return -ENOENT; + } else if (PTR_ERR(res) == -ENOENT) { + /* Try getting the HWInfo table from the 'classic' location */ + cpp_id = NFP_CPP_ISLAND_ID(NFP_CPP_TARGET_MU, + NFP_CPP_ACTION_RW, 0, 1); + cpp_addr = 0x30000; + *cpp_size = 0x0e000; + } else { + return PTR_ERR(res); + } + + db = kmalloc(*cpp_size + 1, GFP_KERNEL); + if (!db) + return -ENOMEM; + + err = nfp_cpp_read(cpp, cpp_id, cpp_addr, db, *cpp_size); + if (err != *cpp_size) { + kfree(db); + return err < 0 ? err : -EIO; + } + + header = (void *)db; + if (nfp_hwinfo_is_updating(header)) { + kfree(db); + return -EBUSY; + } + + if (le32_to_cpu(header->version) != NFP_HWINFO_VERSION_2) { + nfp_err(cpp, "Unknown HWInfo version: 0x%08x\n", + le32_to_cpu(header->version)); + kfree(db); + return -EINVAL; + } + + /* NULL-terminate for safety */ + db[*cpp_size] = '\0'; + + nfp_hwinfo_cache_set(cpp, db); + + return 0; +} + +static int hwinfo_fetch(struct nfp_cpp *cpp, size_t *hwdb_size) +{ + const unsigned long wait_until = jiffies + HWINFO_WAIT * HZ; + int err; + + for (;;) { + const unsigned long start_time = jiffies; + + err = hwinfo_try_fetch(cpp, hwdb_size); + if (!err) + return 0; + + err = msleep_interruptible(100); + if (err || time_after(start_time, wait_until)) { + nfp_err(cpp, "NFP access error\n"); + return -EIO; + } + } +} + +static int nfp_hwinfo_load(struct nfp_cpp *cpp) +{ + struct nfp_hwinfo *db; + size_t hwdb_size = 0; + int err; + + err = hwinfo_fetch(cpp, &hwdb_size); + if (err) + return err; + + db = nfp_hwinfo_cache(cpp); + err = hwinfo_db_validate(cpp, db, hwdb_size); + if (err) { + kfree(db); + nfp_hwinfo_cache_set(cpp, NULL); + return err; + } + + return 0; +} + +/** + * nfp_hwinfo_lookup() - Find a value in the HWInfo table by name + * @cpp: NFP CPP handle + * @lookup: HWInfo name to search for + * + * Return: Value of the HWInfo name, or NULL + */ +const char *nfp_hwinfo_lookup(struct nfp_cpp *cpp, const char *lookup) +{ + const char *key, *val, *end; + struct nfp_hwinfo *hwinfo; + int err; + + hwinfo = nfp_hwinfo_cache(cpp); + if (!hwinfo) { + err = nfp_hwinfo_load(cpp); + if (err) + return NULL; + hwinfo = nfp_hwinfo_cache(cpp); + } + + if (!hwinfo || !lookup) + return NULL; + + end = hwinfo->data + le32_to_cpu(hwinfo->size) - sizeof(u32); + + for (key = hwinfo->data; *key && key < end; + key = val + strlen(val) + 1) { + + val = key + strlen(key) + 1; + + if (strcmp(key, lookup) == 0) + return val; + } + + return NULL; +} |