litmus-rt.git - The LITMUS^RT kernel.

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Diffstat (limited to 'drivers/gpu/drm/drm_memory.c')

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/* * Intel CPU Microcode Update Driver for Linux * * Copyright (C) 2000-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk> * 2006 Shaohua Li <shaohua.li@intel.com> * * This driver allows to upgrade microcode on Intel processors * belonging to IA-32 family - PentiumPro, Pentium II, * Pentium III, Xeon, Pentium 4, etc. * * Reference: Section 8.11 of Volume 3a, IA-32 Intel? Architecture * Software Developer's Manual * Order Number 253668 or free download from: * * http://developer.intel.com/design/pentium4/manuals/253668.htm * * For more information, go to http://www.urbanmyth.org/microcode * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * 1.0 16 Feb 2000, Tigran Aivazian <tigran@sco.com> * Initial release. * 1.01 18 Feb 2000, Tigran Aivazian <tigran@sco.com> * Added read() support + cleanups. * 1.02 21 Feb 2000, Tigran Aivazian <tigran@sco.com> * Added 'device trimming' support. open(O_WRONLY) zeroes * and frees the saved copy of applied microcode. * 1.03 29 Feb 2000, Tigran Aivazian <tigran@sco.com> * Made to use devfs (/dev/cpu/microcode) + cleanups. * 1.04 06 Jun 2000, Simon Trimmer <simon@veritas.com> * Added misc device support (now uses both devfs and misc). * Added MICROCODE_IOCFREE ioctl to clear memory. * 1.05 09 Jun 2000, Simon Trimmer <simon@veritas.com> * Messages for error cases (non Intel & no suitable microcode). * 1.06 03 Aug 2000, Tigran Aivazian <tigran@veritas.com> * Removed ->release(). Removed exclusive open and status bitmap. * Added microcode_rwsem to serialize read()/write()/ioctl(). * Removed global kernel lock usage. * 1.07 07 Sep 2000, Tigran Aivazian <tigran@veritas.com> * Write 0 to 0x8B msr and then cpuid before reading revision, * so that it works even if there were no update done by the * BIOS. Otherwise, reading from 0x8B gives junk (which happened * to be 0 on my machine which is why it worked even when I * disabled update by the BIOS) * Thanks to Eric W. Biederman <ebiederman@lnxi.com> for the fix. * 1.08 11 Dec 2000, Richard Schaal <richard.schaal@intel.com> and * Tigran Aivazian <tigran@veritas.com> * Intel Pentium 4 processor support and bugfixes. * 1.09 30 Oct 2001, Tigran Aivazian <tigran@veritas.com> * Bugfix for HT (Hyper-Threading) enabled processors * whereby processor resources are shared by all logical processors * in a single CPU package. * 1.10 28 Feb 2002 Asit K Mallick <asit.k.mallick@intel.com> and * Tigran Aivazian <tigran@veritas.com>, * Serialize updates as required on HT processors due to speculative * nature of implementation. * 1.11 22 Mar 2002 Tigran Aivazian <tigran@veritas.com> * Fix the panic when writing zero-length microcode chunk. * 1.12 29 Sep 2003 Nitin Kamble <nitin.a.kamble@intel.com>, * Jun Nakajima <jun.nakajima@intel.com> * Support for the microcode updates in the new format. * 1.13 10 Oct 2003 Tigran Aivazian <tigran@veritas.com> * Removed ->read() method and obsoleted MICROCODE_IOCFREE ioctl * because we no longer hold a copy of applied microcode * in kernel memory. * 1.14 25 Jun 2004 Tigran Aivazian <tigran@veritas.com> * Fix sigmatch() macro to handle old CPUs with pf == 0. * Thanks to Stuart Swales for pointing out this bug. */ //#define DEBUG /* pr_debug */ #include <linux/capability.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/sched.h> #include <linux/smp_lock.h> #include <linux/cpumask.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/vmalloc.h> #include <linux/miscdevice.h> #include <linux/spinlock.h> #include <linux/mm.h> #include <linux/fs.h> #include <linux/mutex.h> #include <linux/cpu.h> #include <linux/firmware.h> #include <linux/platform_device.h> #include <asm/msr.h> #include <asm/uaccess.h> #include <asm/processor.h> #include <asm/microcode.h> MODULE_DESCRIPTION("Microcode Update Driver"); MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>"); MODULE_LICENSE("GPL"); #define DEFAULT_UCODE_DATASIZE (2000) /* 2000 bytes */ #define MC_HEADER_SIZE (sizeof(struct microcode_header_intel)) /* 48 bytes */ #define DEFAULT_UCODE_TOTALSIZE (DEFAULT_UCODE_DATASIZE + MC_HEADER_SIZE) /* 2048 bytes */ #define EXT_HEADER_SIZE (sizeof(struct extended_sigtable)) /* 20 bytes */ #define EXT_SIGNATURE_SIZE (sizeof(struct extended_signature)) /* 12 bytes */ #define DWSIZE (sizeof(u32)) #define get_totalsize(mc) \ (((struct microcode_intel *)mc)->hdr.totalsize ? \ ((struct microcode_intel *)mc)->hdr.totalsize : \ DEFAULT_UCODE_TOTALSIZE) #define get_datasize(mc) \ (((struct microcode_intel *)mc)->hdr.datasize ? \ ((struct microcode_intel *)mc)->hdr.datasize : DEFAULT_UCODE_DATASIZE) #define sigmatch(s1, s2, p1, p2) \ (((s1) == (s2)) && (((p1) & (p2)) || (((p1) == 0) && ((p2) == 0)))) #define exttable_size(et) ((et)->count * EXT_SIGNATURE_SIZE + EXT_HEADER_SIZE) /* serialize access to the physical write to MSR 0x79 */ static DEFINE_SPINLOCK(microcode_update_lock); /* no concurrent ->write()s are allowed on /dev/cpu/microcode */ extern struct mutex microcode_mutex; extern struct ucode_cpu_info ucode_cpu_info[NR_CPUS]; void collect_cpu_info(int cpu_num) { struct cpuinfo_x86 *c = &cpu_data(cpu_num); struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num; unsigned int val[2]; /* We should bind the task to the CPU */ BUG_ON(raw_smp_processor_id() != cpu_num); uci->pf = uci->rev = 0; uci->mc.mc_intel = NULL; uci->valid = 1; if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 || cpu_has(c, X86_FEATURE_IA64)) { printk(KERN_ERR "microcode: CPU%d not a capable Intel " "processor\n", cpu_num); uci->valid = 0; return; } uci->sig = cpuid_eax(0x00000001); if ((c->x86_model >= 5) || (c->x86 > 6)) { /* get processor flags from MSR 0x17 */ rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]); uci->pf = 1 << ((val[1] >> 18) & 7); } wrmsr(MSR_IA32_UCODE_REV, 0, 0); /* see notes above for revision 1.07. Apparent chip bug */ sync_core(); /* get the current revision from MSR 0x8B */ rdmsr(MSR_IA32_UCODE_REV, val[0], uci->rev); pr_debug("microcode: collect_cpu_info : sig=0x%x, pf=0x%x, rev=0x%x\n", uci->sig, uci->pf, uci->rev); } static inline int microcode_update_match(int cpu_num, struct microcode_header_intel *mc_header, int sig, int pf) { struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num; if (!sigmatch(sig, uci->sig, pf, uci->pf) || mc_header->rev <= uci->rev) return 0; return 1; } int microcode_sanity_check(void *mc) { struct microcode_header_intel *mc_header = mc; struct extended_sigtable *ext_header = NULL; struct extended_signature *ext_sig; unsigned long total_size, data_size, ext_table_size; int sum, orig_sum, ext_sigcount = 0, i; total_size = get_totalsize(mc_header); data_size = get_datasize(mc_header); if (data_size + MC_HEADER_SIZE > total_size) { printk(KERN_ERR "microcode: error! " "Bad data size in microcode data file\n"); return -EINVAL; } if (mc_header->ldrver != 1 || mc_header->hdrver != 1) { printk(KERN_ERR "microcode: error! " "Unknown microcode update format\n"); return -EINVAL; } ext_table_size = total_size - (MC_HEADER_SIZE + data_size); if (ext_table_size) { if ((ext_table_size < EXT_HEADER_SIZE) || ((ext_table_size - EXT_HEADER_SIZE) % EXT_SIGNATURE_SIZE)) { printk(KERN_ERR "microcode: error! " "Small exttable size in microcode data file\n"); return -EINVAL; } ext_header = mc + MC_HEADER_SIZE + data_size; if (ext_table_size != exttable_size(ext_header)) { printk(KERN_ERR "microcode: error! " "Bad exttable size in microcode data file\n"); return -EFAULT; } ext_sigcount = ext_header->count; } /* check extended table checksum */ if (ext_table_size) { int ext_table_sum = 0; int *ext_tablep = (int *)ext_header; i = ext_table_size / DWSIZE; while (i--) ext_table_sum += ext_tablep[i]; if (ext_table_sum) { printk(KERN_WARNING "microcode: aborting, " "bad extended signature table checksum\n"); return -EINVAL; } } /* calculate the checksum */ orig_sum = 0; i = (MC_HEADER_SIZE + data_size) / DWSIZE; while (i--) orig_sum += ((int *)mc)[i]; if (orig_sum) { printk(KERN_ERR "microcode: aborting, bad checksum\n"); return -EINVAL; } if (!ext_table_size) return 0; /* check extended signature checksum */ for (i = 0; i < ext_sigcount; i++) { ext_sig = (void *)ext_header + EXT_HEADER_SIZE + EXT_SIGNATURE_SIZE * i; sum = orig_sum - (mc_header->sig + mc_header->pf + mc_header->cksum)


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