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![Andy Shevchenko](/assets/img/avatar_default.png)
drivers/sfi/sfi_core.c:164:26: warning: no previous prototype for ‘sfi_map_table’ [-Wmissing-prototypes] drivers/sfi/sfi_core.c:192:6: warning: no previous prototype for ‘sfi_unmap_table’ [-Wmissing-prototypes] Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
521 lines
13 KiB
C
521 lines
13 KiB
C
/* sfi_core.c Simple Firmware Interface - core internals */
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/*
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This file is provided under a dual BSD/GPLv2 license. When using or
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redistributing this file, you may do so under either license.
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GPL LICENSE SUMMARY
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Copyright(c) 2009 Intel Corporation. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of version 2 of the GNU General Public License as
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published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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The full GNU General Public License is included in this distribution
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in the file called LICENSE.GPL.
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BSD LICENSE
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Copyright(c) 2009 Intel Corporation. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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* Neither the name of Intel Corporation nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#define KMSG_COMPONENT "SFI"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/bootmem.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/acpi.h>
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#include <linux/init.h>
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#include <linux/sfi.h>
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#include <linux/slab.h>
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#include "sfi_core.h"
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#define ON_SAME_PAGE(addr1, addr2) \
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(((unsigned long)(addr1) & PAGE_MASK) == \
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((unsigned long)(addr2) & PAGE_MASK))
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#define TABLE_ON_PAGE(page, table, size) (ON_SAME_PAGE(page, table) && \
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ON_SAME_PAGE(page, table + size))
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int sfi_disabled __read_mostly;
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EXPORT_SYMBOL(sfi_disabled);
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static u64 syst_pa __read_mostly;
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static struct sfi_table_simple *syst_va __read_mostly;
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/*
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* FW creates and saves the SFI tables in memory. When these tables get
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* used, they may need to be mapped to virtual address space, and the mapping
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* can happen before or after the ioremap() is ready, so a flag is needed
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* to indicating this
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*/
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static u32 sfi_use_ioremap __read_mostly;
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/*
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* sfi_un/map_memory calls early_ioremap/iounmap which is a __init function
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* and introduces section mismatch. So use __ref to make it calm.
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*/
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static void __iomem * __ref sfi_map_memory(u64 phys, u32 size)
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{
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if (!phys || !size)
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return NULL;
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if (sfi_use_ioremap)
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return ioremap_cache(phys, size);
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else
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return early_ioremap(phys, size);
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}
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static void __ref sfi_unmap_memory(void __iomem *virt, u32 size)
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{
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if (!virt || !size)
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return;
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if (sfi_use_ioremap)
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iounmap(virt);
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else
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early_iounmap(virt, size);
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}
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static void sfi_print_table_header(unsigned long long pa,
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struct sfi_table_header *header)
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{
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pr_info("%4.4s %llX, %04X (v%d %6.6s %8.8s)\n",
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header->sig, pa,
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header->len, header->rev, header->oem_id,
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header->oem_table_id);
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}
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/*
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* sfi_verify_table()
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* Sanity check table lengh, calculate checksum
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*/
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static int sfi_verify_table(struct sfi_table_header *table)
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{
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u8 checksum = 0;
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u8 *puchar = (u8 *)table;
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u32 length = table->len;
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/* Sanity check table length against arbitrary 1MB limit */
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if (length > 0x100000) {
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pr_err("Invalid table length 0x%x\n", length);
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return -1;
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}
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while (length--)
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checksum += *puchar++;
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if (checksum) {
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pr_err("Checksum %2.2X should be %2.2X\n",
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table->csum, table->csum - checksum);
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return -1;
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}
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return 0;
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}
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/*
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* sfi_map_table()
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*
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* Return address of mapped table
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* Check for common case that we can re-use mapping to SYST,
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* which requires syst_pa, syst_va to be initialized.
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*/
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static struct sfi_table_header *sfi_map_table(u64 pa)
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{
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struct sfi_table_header *th;
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u32 length;
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if (!TABLE_ON_PAGE(syst_pa, pa, sizeof(struct sfi_table_header)))
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th = sfi_map_memory(pa, sizeof(struct sfi_table_header));
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else
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th = (void *)syst_va + (pa - syst_pa);
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/* If table fits on same page as its header, we are done */
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if (TABLE_ON_PAGE(th, th, th->len))
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return th;
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/* Entire table does not fit on same page as SYST */
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length = th->len;
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if (!TABLE_ON_PAGE(syst_pa, pa, sizeof(struct sfi_table_header)))
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sfi_unmap_memory(th, sizeof(struct sfi_table_header));
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return sfi_map_memory(pa, length);
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}
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/*
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* sfi_unmap_table()
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*
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* Undoes effect of sfi_map_table() by unmapping table
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* if it did not completely fit on same page as SYST.
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*/
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static void sfi_unmap_table(struct sfi_table_header *th)
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{
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if (!TABLE_ON_PAGE(syst_va, th, th->len))
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sfi_unmap_memory(th, TABLE_ON_PAGE(th, th, th->len) ?
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sizeof(*th) : th->len);
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}
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static int sfi_table_check_key(struct sfi_table_header *th,
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struct sfi_table_key *key)
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{
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if (strncmp(th->sig, key->sig, SFI_SIGNATURE_SIZE)
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|| (key->oem_id && strncmp(th->oem_id,
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key->oem_id, SFI_OEM_ID_SIZE))
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|| (key->oem_table_id && strncmp(th->oem_table_id,
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key->oem_table_id, SFI_OEM_TABLE_ID_SIZE)))
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return -1;
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return 0;
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}
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/*
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* This function will be used in 2 cases:
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* 1. used to enumerate and verify the tables addressed by SYST/XSDT,
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* thus no signature will be given (in kernel boot phase)
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* 2. used to parse one specific table, signature must exist, and
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* the mapped virt address will be returned, and the virt space
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* will be released by call sfi_put_table() later
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*
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* This two cases are from two different functions with two different
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* sections and causes section mismatch warning. So use __ref to tell
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* modpost not to make any noise.
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*
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* Return value:
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* NULL: when can't find a table matching the key
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* ERR_PTR(error): error value
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* virt table address: when a matched table is found
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*/
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struct sfi_table_header *
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__ref sfi_check_table(u64 pa, struct sfi_table_key *key)
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{
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struct sfi_table_header *th;
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void *ret = NULL;
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th = sfi_map_table(pa);
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if (!th)
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return ERR_PTR(-ENOMEM);
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if (!key->sig) {
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sfi_print_table_header(pa, th);
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if (sfi_verify_table(th))
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ret = ERR_PTR(-EINVAL);
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} else {
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if (!sfi_table_check_key(th, key))
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return th; /* Success */
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}
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sfi_unmap_table(th);
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return ret;
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}
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/*
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* sfi_get_table()
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*
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* Search SYST for the specified table with the signature in
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* the key, and return the mapped table
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*/
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struct sfi_table_header *sfi_get_table(struct sfi_table_key *key)
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{
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struct sfi_table_header *th;
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u32 tbl_cnt, i;
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tbl_cnt = SFI_GET_NUM_ENTRIES(syst_va, u64);
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for (i = 0; i < tbl_cnt; i++) {
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th = sfi_check_table(syst_va->pentry[i], key);
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if (!IS_ERR(th) && th)
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return th;
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}
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return NULL;
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}
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void sfi_put_table(struct sfi_table_header *th)
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{
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sfi_unmap_table(th);
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}
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/* Find table with signature, run handler on it */
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int sfi_table_parse(char *signature, char *oem_id, char *oem_table_id,
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sfi_table_handler handler)
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{
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struct sfi_table_header *table = NULL;
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struct sfi_table_key key;
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int ret = -EINVAL;
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if (sfi_disabled || !handler || !signature)
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goto exit;
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key.sig = signature;
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key.oem_id = oem_id;
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key.oem_table_id = oem_table_id;
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table = sfi_get_table(&key);
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if (!table)
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goto exit;
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ret = handler(table);
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sfi_put_table(table);
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exit:
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return ret;
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}
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EXPORT_SYMBOL_GPL(sfi_table_parse);
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/*
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* sfi_parse_syst()
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* Checksum all the tables in SYST and print their headers
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*
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* success: set syst_va, return 0
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*/
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static int __init sfi_parse_syst(void)
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{
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struct sfi_table_key key = SFI_ANY_KEY;
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int tbl_cnt, i;
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void *ret;
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syst_va = sfi_map_memory(syst_pa, sizeof(struct sfi_table_simple));
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if (!syst_va)
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return -ENOMEM;
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tbl_cnt = SFI_GET_NUM_ENTRIES(syst_va, u64);
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for (i = 0; i < tbl_cnt; i++) {
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ret = sfi_check_table(syst_va->pentry[i], &key);
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if (IS_ERR(ret))
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return PTR_ERR(ret);
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}
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return 0;
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}
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/*
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* The OS finds the System Table by searching 16-byte boundaries between
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* physical address 0x000E0000 and 0x000FFFFF. The OS shall search this region
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* starting at the low address and shall stop searching when the 1st valid SFI
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* System Table is found.
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*
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* success: set syst_pa, return 0
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* fail: return -1
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*/
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static __init int sfi_find_syst(void)
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{
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unsigned long offset, len;
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void *start;
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len = SFI_SYST_SEARCH_END - SFI_SYST_SEARCH_BEGIN;
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start = sfi_map_memory(SFI_SYST_SEARCH_BEGIN, len);
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if (!start)
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return -1;
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for (offset = 0; offset < len; offset += 16) {
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struct sfi_table_header *syst_hdr;
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syst_hdr = start + offset;
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if (strncmp(syst_hdr->sig, SFI_SIG_SYST,
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SFI_SIGNATURE_SIZE))
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continue;
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if (syst_hdr->len > PAGE_SIZE)
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continue;
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sfi_print_table_header(SFI_SYST_SEARCH_BEGIN + offset,
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syst_hdr);
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if (sfi_verify_table(syst_hdr))
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continue;
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/*
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* Enforce SFI spec mandate that SYST reside within a page.
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*/
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if (!ON_SAME_PAGE(syst_pa, syst_pa + syst_hdr->len)) {
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pr_info("SYST 0x%llx + 0x%x crosses page\n",
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syst_pa, syst_hdr->len);
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continue;
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}
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/* Success */
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syst_pa = SFI_SYST_SEARCH_BEGIN + offset;
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sfi_unmap_memory(start, len);
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return 0;
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}
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sfi_unmap_memory(start, len);
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return -1;
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}
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static struct kobject *sfi_kobj;
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static struct kobject *tables_kobj;
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static ssize_t sfi_table_show(struct file *filp, struct kobject *kobj,
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struct bin_attribute *bin_attr, char *buf,
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loff_t offset, size_t count)
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{
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struct sfi_table_attr *tbl_attr =
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container_of(bin_attr, struct sfi_table_attr, attr);
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struct sfi_table_header *th = NULL;
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struct sfi_table_key key;
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ssize_t cnt;
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key.sig = tbl_attr->name;
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key.oem_id = NULL;
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key.oem_table_id = NULL;
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if (strncmp(SFI_SIG_SYST, tbl_attr->name, SFI_SIGNATURE_SIZE)) {
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th = sfi_get_table(&key);
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if (!th)
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return 0;
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cnt = memory_read_from_buffer(buf, count, &offset,
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th, th->len);
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sfi_put_table(th);
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} else
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cnt = memory_read_from_buffer(buf, count, &offset,
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syst_va, syst_va->header.len);
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return cnt;
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}
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struct sfi_table_attr __init *sfi_sysfs_install_table(u64 pa)
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{
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struct sfi_table_attr *tbl_attr;
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struct sfi_table_header *th;
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int ret;
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tbl_attr = kzalloc(sizeof(struct sfi_table_attr), GFP_KERNEL);
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if (!tbl_attr)
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return NULL;
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th = sfi_map_table(pa);
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if (!th || !th->sig[0]) {
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kfree(tbl_attr);
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return NULL;
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}
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sysfs_attr_init(&tbl_attr->attr.attr);
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memcpy(tbl_attr->name, th->sig, SFI_SIGNATURE_SIZE);
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tbl_attr->attr.size = 0;
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tbl_attr->attr.read = sfi_table_show;
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tbl_attr->attr.attr.name = tbl_attr->name;
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tbl_attr->attr.attr.mode = 0400;
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ret = sysfs_create_bin_file(tables_kobj,
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&tbl_attr->attr);
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if (ret) {
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kfree(tbl_attr);
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tbl_attr = NULL;
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}
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sfi_unmap_table(th);
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return tbl_attr;
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}
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static int __init sfi_sysfs_init(void)
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{
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int tbl_cnt, i;
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if (sfi_disabled)
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return 0;
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sfi_kobj = kobject_create_and_add("sfi", firmware_kobj);
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if (!sfi_kobj)
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return 0;
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tables_kobj = kobject_create_and_add("tables", sfi_kobj);
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if (!tables_kobj) {
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kobject_put(sfi_kobj);
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return 0;
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}
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sfi_sysfs_install_table(syst_pa);
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tbl_cnt = SFI_GET_NUM_ENTRIES(syst_va, u64);
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for (i = 0; i < tbl_cnt; i++)
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sfi_sysfs_install_table(syst_va->pentry[i]);
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sfi_acpi_sysfs_init();
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kobject_uevent(sfi_kobj, KOBJ_ADD);
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kobject_uevent(tables_kobj, KOBJ_ADD);
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pr_info("SFI sysfs interfaces init success\n");
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return 0;
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}
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void __init sfi_init(void)
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{
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if (!acpi_disabled)
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disable_sfi();
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if (sfi_disabled)
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return;
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pr_info("Simple Firmware Interface v0.81 http://simplefirmware.org\n");
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if (sfi_find_syst() || sfi_parse_syst() || sfi_platform_init())
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disable_sfi();
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return;
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}
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void __init sfi_init_late(void)
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{
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int length;
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if (sfi_disabled)
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return;
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length = syst_va->header.len;
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sfi_unmap_memory(syst_va, sizeof(struct sfi_table_simple));
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/* Use ioremap now after it is ready */
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sfi_use_ioremap = 1;
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syst_va = sfi_map_memory(syst_pa, length);
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sfi_acpi_init();
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}
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/*
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* The reason we put it here because we need wait till the /sys/firmware
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* is setup, then our interface can be registered in /sys/firmware/sfi
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*/
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core_initcall(sfi_sysfs_init);
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