From 05ea39f295a3d7bad3198f9fec4acfef1a4d7058 Mon Sep 17 00:00:00 2001 From: Ralf Baechle Date: Wed, 10 Oct 2012 09:45:25 +0200 Subject: [PATCH] MIPS: MT: Remove VPE loader. It's sole known users AP/SP API and kspd are gone. Signed-off-by: Ralf Baechle --- arch/mips/Kconfig | 20 - arch/mips/kernel/Makefile | 2 - arch/mips/kernel/vpe.c | 1596 ------------------------------------- 3 files changed, 1618 deletions(-) delete mode 100644 arch/mips/kernel/vpe.c diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index c528a015ee76..1de1f3590089 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -1990,16 +1990,6 @@ config MIPS_MT_FPAFF default y depends on MIPS_MT_SMP || MIPS_MT_SMTC -config MIPS_VPE_LOADER - bool "VPE loader support." - depends on SYS_SUPPORTS_MULTITHREADING - select CPU_MIPSR2_IRQ_VI - select CPU_MIPSR2_IRQ_EI - select MIPS_MT - help - Includes a loader for loading an elf relocatable object - onto another VPE and running it. - config MIPS_MT_SMTC_IM_BACKSTOP bool "Use per-TC register bits as backstop for inhibited IM bits" depends on MIPS_MT_SMTC @@ -2023,16 +2013,6 @@ config MIPS_MT_SMTC_IRQAFF platform code. Adds some overhead to interrupt dispatch, and should be used only if you know what you are doing. -config MIPS_VPE_LOADER_TOM - bool "Load VPE program into memory hidden from linux" - depends on MIPS_VPE_LOADER - default y - help - The loader can use memory that is present but has been hidden from - Linux using the kernel command line option "mem=xxMB". It's up to - you to ensure the amount you put in the option and the space your - program requires is less or equal to the amount physically present. - config MIPS_CMP bool "MIPS CMP framework support" depends on SYS_SUPPORTS_MIPS_CMP diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile index 23e23d79f363..94169f5a3754 100644 --- a/arch/mips/kernel/Makefile +++ b/arch/mips/kernel/Makefile @@ -51,8 +51,6 @@ obj-$(CONFIG_MIPS_MT_SMP) += smp-mt.o obj-$(CONFIG_MIPS_CMP) += smp-cmp.o obj-$(CONFIG_CPU_MIPSR2) += spram.o -obj-$(CONFIG_MIPS_VPE_LOADER) += vpe.o - obj-$(CONFIG_I8259) += i8259.o obj-$(CONFIG_IRQ_CPU) += irq_cpu.o obj-$(CONFIG_IRQ_CPU_RM7K) += irq-rm7000.o diff --git a/arch/mips/kernel/vpe.c b/arch/mips/kernel/vpe.c deleted file mode 100644 index eec690af6581..000000000000 --- a/arch/mips/kernel/vpe.c +++ /dev/null @@ -1,1596 +0,0 @@ -/* - * Copyright (C) 2004, 2005 MIPS Technologies, Inc. All rights reserved. - * - * This program is free software; you can distribute it and/or modify it - * under the terms of the GNU General Public License (Version 2) as - * published by the Free Software Foundation. - * - * This program is distributed in the hope it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License - * for more details. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. - */ - -/* - * VPE support module - * - * Provides support for loading a MIPS SP program on VPE1. - * The SP environment is rather simple, no tlb's. It needs to be relocatable - * (or partially linked). You should initialise your stack in the startup - * code. This loader looks for the symbol __start and sets up - * execution to resume from there. The MIPS SDE kit contains suitable examples. - * - * To load and run, simply cat a SP 'program file' to /dev/vpe1. - * i.e cat spapp >/dev/vpe1. - */ -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -typedef void *vpe_handle; - -#ifndef ARCH_SHF_SMALL -#define ARCH_SHF_SMALL 0 -#endif - -/* If this is set, the section belongs in the init part of the module */ -#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) - -/* - * The number of TCs and VPEs physically available on the core - */ -static int hw_tcs, hw_vpes; -static char module_name[] = "vpe"; -static int major; -static const int minor = 1; /* fixed for now */ - -/* grab the likely amount of memory we will need. */ -#ifdef CONFIG_MIPS_VPE_LOADER_TOM -#define P_SIZE (2 * 1024 * 1024) -#else -/* add an overhead to the max kmalloc size for non-striped symbols/etc */ -#define P_SIZE (256 * 1024) -#endif - -extern unsigned long physical_memsize; - -#define MAX_VPES 16 -#define VPE_PATH_MAX 256 - -enum vpe_state { - VPE_STATE_UNUSED = 0, - VPE_STATE_INUSE, - VPE_STATE_RUNNING -}; - -enum tc_state { - TC_STATE_UNUSED = 0, - TC_STATE_INUSE, - TC_STATE_RUNNING, - TC_STATE_DYNAMIC -}; - -struct vpe { - enum vpe_state state; - - /* (device) minor associated with this vpe */ - int minor; - - /* elfloader stuff */ - void *load_addr; - unsigned long len; - char *pbuffer; - unsigned long plen; - unsigned int uid, gid; - char cwd[VPE_PATH_MAX]; - - unsigned long __start; - - /* tc's associated with this vpe */ - struct list_head tc; - - /* The list of vpe's */ - struct list_head list; - - /* shared symbol address */ - void *shared_ptr; - - /* the list of who wants to know when something major happens */ - struct list_head notify; - - unsigned int ntcs; -}; - -struct tc { - enum tc_state state; - int index; - - struct vpe *pvpe; /* parent VPE */ - struct list_head tc; /* The list of TC's with this VPE */ - struct list_head list; /* The global list of tc's */ -}; - -struct { - spinlock_t vpe_list_lock; - struct list_head vpe_list; /* Virtual processing elements */ - spinlock_t tc_list_lock; - struct list_head tc_list; /* Thread contexts */ -} vpecontrol = { - .vpe_list_lock = __SPIN_LOCK_UNLOCKED(vpe_list_lock), - .vpe_list = LIST_HEAD_INIT(vpecontrol.vpe_list), - .tc_list_lock = __SPIN_LOCK_UNLOCKED(tc_list_lock), - .tc_list = LIST_HEAD_INIT(vpecontrol.tc_list) -}; - -static void release_progmem(void *ptr); - -/* get the vpe associated with this minor */ -static struct vpe *get_vpe(int minor) -{ - struct vpe *res, *v; - - if (!cpu_has_mipsmt) - return NULL; - - res = NULL; - spin_lock(&vpecontrol.vpe_list_lock); - list_for_each_entry(v, &vpecontrol.vpe_list, list) { - if (v->minor == minor) { - res = v; - break; - } - } - spin_unlock(&vpecontrol.vpe_list_lock); - - return res; -} - -/* get the vpe associated with this minor */ -static struct tc *get_tc(int index) -{ - struct tc *res, *t; - - res = NULL; - spin_lock(&vpecontrol.tc_list_lock); - list_for_each_entry(t, &vpecontrol.tc_list, list) { - if (t->index == index) { - res = t; - break; - } - } - spin_unlock(&vpecontrol.tc_list_lock); - - return res; -} - -/* allocate a vpe and associate it with this minor (or index) */ -static struct vpe *alloc_vpe(int minor) -{ - struct vpe *v; - - if ((v = kzalloc(sizeof(struct vpe), GFP_KERNEL)) == NULL) - return NULL; - - INIT_LIST_HEAD(&v->tc); - spin_lock(&vpecontrol.vpe_list_lock); - list_add_tail(&v->list, &vpecontrol.vpe_list); - spin_unlock(&vpecontrol.vpe_list_lock); - - INIT_LIST_HEAD(&v->notify); - v->minor = minor; - - return v; -} - -/* allocate a tc. At startup only tc0 is running, all other can be halted. */ -static struct tc *alloc_tc(int index) -{ - struct tc *tc; - - if ((tc = kzalloc(sizeof(struct tc), GFP_KERNEL)) == NULL) - goto out; - - INIT_LIST_HEAD(&tc->tc); - tc->index = index; - - spin_lock(&vpecontrol.tc_list_lock); - list_add_tail(&tc->list, &vpecontrol.tc_list); - spin_unlock(&vpecontrol.tc_list_lock); - -out: - return tc; -} - -/* clean up and free everything */ -static void release_vpe(struct vpe *v) -{ - list_del(&v->list); - if (v->load_addr) - release_progmem(v); - kfree(v); -} - -static void __maybe_unused dump_mtregs(void) -{ - unsigned long val; - - val = read_c0_config3(); - printk("config3 0x%lx MT %ld\n", val, - (val & CONFIG3_MT) >> CONFIG3_MT_SHIFT); - - val = read_c0_mvpcontrol(); - printk("MVPControl 0x%lx, STLB %ld VPC %ld EVP %ld\n", val, - (val & MVPCONTROL_STLB) >> MVPCONTROL_STLB_SHIFT, - (val & MVPCONTROL_VPC) >> MVPCONTROL_VPC_SHIFT, - (val & MVPCONTROL_EVP)); - - val = read_c0_mvpconf0(); - printk("mvpconf0 0x%lx, PVPE %ld PTC %ld M %ld\n", val, - (val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT, - val & MVPCONF0_PTC, (val & MVPCONF0_M) >> MVPCONF0_M_SHIFT); -} - -/* Find some VPE program space */ -static void *alloc_progmem(unsigned long len) -{ - void *addr; - -#ifdef CONFIG_MIPS_VPE_LOADER_TOM - /* - * This means you must tell Linux to use less memory than you - * physically have, for example by passing a mem= boot argument. - */ - addr = pfn_to_kaddr(max_low_pfn); - memset(addr, 0, len); -#else - /* simple grab some mem for now */ - addr = kzalloc(len, GFP_KERNEL); -#endif - - return addr; -} - -static void release_progmem(void *ptr) -{ -#ifndef CONFIG_MIPS_VPE_LOADER_TOM - kfree(ptr); -#endif -} - -/* Update size with this section: return offset. */ -static long get_offset(unsigned long *size, Elf_Shdr * sechdr) -{ - long ret; - - ret = ALIGN(*size, sechdr->sh_addralign ? : 1); - *size = ret + sechdr->sh_size; - return ret; -} - -/* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld - might -- code, read-only data, read-write data, small data. Tally - sizes, and place the offsets into sh_entsize fields: high bit means it - belongs in init. */ -static void layout_sections(struct module *mod, const Elf_Ehdr * hdr, - Elf_Shdr * sechdrs, const char *secstrings) -{ - static unsigned long const masks[][2] = { - /* NOTE: all executable code must be the first section - * in this array; otherwise modify the text_size - * finder in the two loops below */ - {SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL}, - {SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL}, - {SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL}, - {ARCH_SHF_SMALL | SHF_ALLOC, 0} - }; - unsigned int m, i; - - for (i = 0; i < hdr->e_shnum; i++) - sechdrs[i].sh_entsize = ~0UL; - - for (m = 0; m < ARRAY_SIZE(masks); ++m) { - for (i = 0; i < hdr->e_shnum; ++i) { - Elf_Shdr *s = &sechdrs[i]; - - // || strncmp(secstrings + s->sh_name, ".init", 5) == 0) - if ((s->sh_flags & masks[m][0]) != masks[m][0] - || (s->sh_flags & masks[m][1]) - || s->sh_entsize != ~0UL) - continue; - s->sh_entsize = - get_offset((unsigned long *)&mod->core_size, s); - } - - if (m == 0) - mod->core_text_size = mod->core_size; - - } -} - - -/* from module-elf32.c, but subverted a little */ - -struct mips_hi16 { - struct mips_hi16 *next; - Elf32_Addr *addr; - Elf32_Addr value; -}; - -static struct mips_hi16 *mips_hi16_list; -static unsigned int gp_offs, gp_addr; - -static int apply_r_mips_none(struct module *me, uint32_t *location, - Elf32_Addr v) -{ - return 0; -} - -static int apply_r_mips_gprel16(struct module *me, uint32_t *location, - Elf32_Addr v) -{ - int rel; - - if( !(*location & 0xffff) ) { - rel = (int)v - gp_addr; - } - else { - /* .sbss + gp(relative) + offset */ - /* kludge! */ - rel = (int)(short)((int)v + gp_offs + - (int)(short)(*location & 0xffff) - gp_addr); - } - - if( (rel > 32768) || (rel < -32768) ) { - printk(KERN_DEBUG "VPE loader: apply_r_mips_gprel16: " - "relative address 0x%x out of range of gp register\n", - rel); - return -ENOEXEC; - } - - *location = (*location & 0xffff0000) | (rel & 0xffff); - - return 0; -} - -static int apply_r_mips_pc16(struct module *me, uint32_t *location, - Elf32_Addr v) -{ - int rel; - rel = (((unsigned int)v - (unsigned int)location)); - rel >>= 2; // because the offset is in _instructions_ not bytes. - rel -= 1; // and one instruction less due to the branch delay slot. - - if( (rel > 32768) || (rel < -32768) ) { - printk(KERN_DEBUG "VPE loader: " - "apply_r_mips_pc16: relative address out of range 0x%x\n", rel); - return -ENOEXEC; - } - - *location = (*location & 0xffff0000) | (rel & 0xffff); - - return 0; -} - -static int apply_r_mips_32(struct module *me, uint32_t *location, - Elf32_Addr v) -{ - *location += v; - - return 0; -} - -static int apply_r_mips_26(struct module *me, uint32_t *location, - Elf32_Addr v) -{ - if (v % 4) { - printk(KERN_DEBUG "VPE loader: apply_r_mips_26 " - " unaligned relocation\n"); - return -ENOEXEC; - } - -/* - * Not desperately convinced this is a good check of an overflow condition - * anyway. But it gets in the way of handling undefined weak symbols which - * we want to set to zero. - * if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) { - * printk(KERN_ERR - * "module %s: relocation overflow\n", - * me->name); - * return -ENOEXEC; - * } - */ - - *location = (*location & ~0x03ffffff) | - ((*location + (v >> 2)) & 0x03ffffff); - return 0; -} - -static int apply_r_mips_hi16(struct module *me, uint32_t *location, - Elf32_Addr v) -{ - struct mips_hi16 *n; - - /* - * We cannot relocate this one now because we don't know the value of - * the carry we need to add. Save the information, and let LO16 do the - * actual relocation. - */ - n = kmalloc(sizeof *n, GFP_KERNEL); - if (!n) - return -ENOMEM; - - n->addr = location; - n->value = v; - n->next = mips_hi16_list; - mips_hi16_list = n; - - return 0; -} - -static int apply_r_mips_lo16(struct module *me, uint32_t *location, - Elf32_Addr v) -{ - unsigned long insnlo = *location; - Elf32_Addr val, vallo; - struct mips_hi16 *l, *next; - - /* Sign extend the addend we extract from the lo insn. */ - vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000; - - if (mips_hi16_list != NULL) { - - l = mips_hi16_list; - while (l != NULL) { - unsigned long insn; - - /* - * The value for the HI16 had best be the same. - */ - if (v != l->value) { - printk(KERN_DEBUG "VPE loader: " - "apply_r_mips_lo16/hi16: \t" - "inconsistent value information\n"); - goto out_free; - } - - /* - * Do the HI16 relocation. Note that we actually don't - * need to know anything about the LO16 itself, except - * where to find the low 16 bits of the addend needed - * by the LO16. - */ - insn = *l->addr; - val = ((insn & 0xffff) << 16) + vallo; - val += v; - - /* - * Account for the sign extension that will happen in - * the low bits. - */ - val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff; - - insn = (insn & ~0xffff) | val; - *l->addr = insn; - - next = l->next; - kfree(l); - l = next; - } - - mips_hi16_list = NULL; - } - - /* - * Ok, we're done with the HI16 relocs. Now deal with the LO16. - */ - val = v + vallo; - insnlo = (insnlo & ~0xffff) | (val & 0xffff); - *location = insnlo; - - return 0; - -out_free: - while (l != NULL) { - next = l->next; - kfree(l); - l = next; - } - mips_hi16_list = NULL; - - return -ENOEXEC; -} - -static int (*reloc_handlers[]) (struct module *me, uint32_t *location, - Elf32_Addr v) = { - [R_MIPS_NONE] = apply_r_mips_none, - [R_MIPS_32] = apply_r_mips_32, - [R_MIPS_26] = apply_r_mips_26, - [R_MIPS_HI16] = apply_r_mips_hi16, - [R_MIPS_LO16] = apply_r_mips_lo16, - [R_MIPS_GPREL16] = apply_r_mips_gprel16, - [R_MIPS_PC16] = apply_r_mips_pc16 -}; - -static char *rstrs[] = { - [R_MIPS_NONE] = "MIPS_NONE", - [R_MIPS_32] = "MIPS_32", - [R_MIPS_26] = "MIPS_26", - [R_MIPS_HI16] = "MIPS_HI16", - [R_MIPS_LO16] = "MIPS_LO16", - [R_MIPS_GPREL16] = "MIPS_GPREL16", - [R_MIPS_PC16] = "MIPS_PC16" -}; - -static int apply_relocations(Elf32_Shdr *sechdrs, - const char *strtab, - unsigned int symindex, - unsigned int relsec, - struct module *me) -{ - Elf32_Rel *rel = (void *) sechdrs[relsec].sh_addr; - Elf32_Sym *sym; - uint32_t *location; - unsigned int i; - Elf32_Addr v; - int res; - - for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { - Elf32_Word r_info = rel[i].r_info; - - /* This is where to make the change */ - location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr - + rel[i].r_offset; - /* This is the symbol it is referring to */ - sym = (Elf32_Sym *)sechdrs[symindex].sh_addr - + ELF32_R_SYM(r_info); - - if (!sym->st_value) { - printk(KERN_DEBUG "%s: undefined weak symbol %s\n", - me->name, strtab + sym->st_name); - /* just print the warning, dont barf */ - } - - v = sym->st_value; - - res = reloc_handlers[ELF32_R_TYPE(r_info)](me, location, v); - if( res ) { - char *r = rstrs[ELF32_R_TYPE(r_info)]; - printk(KERN_WARNING "VPE loader: .text+0x%x " - "relocation type %s for symbol \"%s\" failed\n", - rel[i].r_offset, r ? r : "UNKNOWN", - strtab + sym->st_name); - return res; - } - } - - return 0; -} - -static inline void save_gp_address(unsigned int secbase, unsigned int rel) -{ - gp_addr = secbase + rel; - gp_offs = gp_addr - (secbase & 0xffff0000); -} -/* end module-elf32.c */ - - - -/* Change all symbols so that sh_value encodes the pointer directly. */ -static void simplify_symbols(Elf_Shdr * sechdrs, - unsigned int symindex, - const char *strtab, - const char *secstrings, - unsigned int nsecs, struct module *mod) -{ - Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; - unsigned long secbase, bssbase = 0; - unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); - int size; - - /* find the .bss section for COMMON symbols */ - for (i = 0; i < nsecs; i++) { - if (strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) == 0) { - bssbase = sechdrs[i].sh_addr; - break; - } - } - - for (i = 1; i < n; i++) { - switch (sym[i].st_shndx) { - case SHN_COMMON: - /* Allocate space for the symbol in the .bss section. - st_value is currently size. - We want it to have the address of the symbol. */ - - size = sym[i].st_value; - sym[i].st_value = bssbase; - - bssbase += size; - break; - - case SHN_ABS: - /* Don't need to do anything */ - break; - - case SHN_UNDEF: - /* ret = -ENOENT; */ - break; - - case SHN_MIPS_SCOMMON: - printk(KERN_DEBUG "simplify_symbols: ignoring SHN_MIPS_SCOMMON " - "symbol <%s> st_shndx %d\n", strtab + sym[i].st_name, - sym[i].st_shndx); - // .sbss section - break; - - default: - secbase = sechdrs[sym[i].st_shndx].sh_addr; - - if (strncmp(strtab + sym[i].st_name, "_gp", 3) == 0) { - save_gp_address(secbase, sym[i].st_value); - } - - sym[i].st_value += secbase; - break; - } - } -} - -#ifdef DEBUG_ELFLOADER -static void dump_elfsymbols(Elf_Shdr * sechdrs, unsigned int symindex, - const char *strtab, struct module *mod) -{ - Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; - unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); - - printk(KERN_DEBUG "dump_elfsymbols: n %d\n", n); - for (i = 1; i < n; i++) { - printk(KERN_DEBUG " i %d name <%s> 0x%x\n", i, - strtab + sym[i].st_name, sym[i].st_value); - } -} -#endif - -/* We are prepared so configure and start the VPE... */ -static int vpe_run(struct vpe * v) -{ - unsigned long flags, val, dmt_flag; - struct vpe_notifications *n; - unsigned int vpeflags; - struct tc *t; - - /* check we are the Master VPE */ - local_irq_save(flags); - val = read_c0_vpeconf0(); - if (!(val & VPECONF0_MVP)) { - printk(KERN_WARNING - "VPE loader: only Master VPE's are allowed to configure MT\n"); - local_irq_restore(flags); - - return -1; - } - - dmt_flag = dmt(); - vpeflags = dvpe(); - - if (!list_empty(&v->tc)) { - if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) { - evpe(vpeflags); - emt(dmt_flag); - local_irq_restore(flags); - - printk(KERN_WARNING - "VPE loader: TC %d is already in use.\n", - t->index); - return -ENOEXEC; - } - } else { - evpe(vpeflags); - emt(dmt_flag); - local_irq_restore(flags); - - printk(KERN_WARNING - "VPE loader: No TC's associated with VPE %d\n", - v->minor); - - return -ENOEXEC; - } - - /* Put MVPE's into 'configuration state' */ - set_c0_mvpcontrol(MVPCONTROL_VPC); - - settc(t->index); - - /* should check it is halted, and not activated */ - if ((read_tc_c0_tcstatus() & TCSTATUS_A) || !(read_tc_c0_tchalt() & TCHALT_H)) { - evpe(vpeflags); - emt(dmt_flag); - local_irq_restore(flags); - - printk(KERN_WARNING "VPE loader: TC %d is already active!\n", - t->index); - - return -ENOEXEC; - } - - /* Write the address we want it to start running from in the TCPC register. */ - write_tc_c0_tcrestart((unsigned long)v->__start); - write_tc_c0_tccontext((unsigned long)0); - - /* - * Mark the TC as activated, not interrupt exempt and not dynamically - * allocatable - */ - val = read_tc_c0_tcstatus(); - val = (val & ~(TCSTATUS_DA | TCSTATUS_IXMT)) | TCSTATUS_A; - write_tc_c0_tcstatus(val); - - write_tc_c0_tchalt(read_tc_c0_tchalt() & ~TCHALT_H); - - /* - * The sde-kit passes 'memsize' to __start in $a3, so set something - * here... Or set $a3 to zero and define DFLT_STACK_SIZE and - * DFLT_HEAP_SIZE when you compile your program - */ - mttgpr(6, v->ntcs); - mttgpr(7, physical_memsize); - - /* set up VPE1 */ - /* - * bind the TC to VPE 1 as late as possible so we only have the final - * VPE registers to set up, and so an EJTAG probe can trigger on it - */ - write_tc_c0_tcbind((read_tc_c0_tcbind() & ~TCBIND_CURVPE) | 1); - - write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~(VPECONF0_VPA)); - - back_to_back_c0_hazard(); - - /* Set up the XTC bit in vpeconf0 to point at our tc */ - write_vpe_c0_vpeconf0( (read_vpe_c0_vpeconf0() & ~(VPECONF0_XTC)) - | (t->index << VPECONF0_XTC_SHIFT)); - - back_to_back_c0_hazard(); - - /* enable this VPE */ - write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA); - - /* clear out any left overs from a previous program */ - write_vpe_c0_status(0); - write_vpe_c0_cause(0); - - /* take system out of configuration state */ - clear_c0_mvpcontrol(MVPCONTROL_VPC); - - /* - * SMTC/SMVP kernels manage VPE enable independently, - * but uniprocessor kernels need to turn it on, even - * if that wasn't the pre-dvpe() state. - */ -#ifdef CONFIG_SMP - evpe(vpeflags); -#else - evpe(EVPE_ENABLE); -#endif - emt(dmt_flag); - local_irq_restore(flags); - - list_for_each_entry(n, &v->notify, list) - n->start(minor); - - return 0; -} - -static int find_vpe_symbols(struct vpe * v, Elf_Shdr * sechdrs, - unsigned int symindex, const char *strtab, - struct module *mod) -{ - Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; - unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); - - for (i = 1; i < n; i++) { - if (strcmp(strtab + sym[i].st_name, "__start") == 0) { - v->__start = sym[i].st_value; - } - - if (strcmp(strtab + sym[i].st_name, "vpe_shared") == 0) { - v->shared_ptr = (void *)sym[i].st_value; - } - } - - if ( (v->__start == 0) || (v->shared_ptr == NULL)) - return -1; - - return 0; -} - -/* - * Allocates a VPE with some program code space(the load address), copies the - * contents of the program (p)buffer performing relocatations/etc, free's it - * when finished. - */ -static int vpe_elfload(struct vpe * v) -{ - Elf_Ehdr *hdr; - Elf_Shdr *sechdrs; - long err = 0; - char *secstrings, *strtab = NULL; - unsigned int len, i, symindex = 0, strindex = 0, relocate = 0; - struct module mod; // so we can re-use the relocations code - - memset(&mod, 0, sizeof(struct module)); - strcpy(mod.name, "VPE loader"); - - hdr = (Elf_Ehdr *) v->pbuffer; - len = v->plen; - - /* Sanity checks against insmoding binaries or wrong arch, - weird elf version */ - if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0 - || (hdr->e_type != ET_REL && hdr->e_type != ET_EXEC) - || !elf_check_arch(hdr) - || hdr->e_shentsize != sizeof(*sechdrs)) { - printk(KERN_WARNING - "VPE loader: program wrong arch or weird elf version\n"); - - return -ENOEXEC; - } - - if (hdr->e_type == ET_REL) - relocate = 1; - - if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) { - printk(KERN_ERR "VPE loader: program length %u truncated\n", - len); - - return -ENOEXEC; - } - - /* Convenience variables */ - sechdrs = (void *)hdr + hdr->e_shoff; - secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; - sechdrs[0].sh_addr = 0; - - /* And these should exist, but gcc whinges if we don't init them */ - symindex = strindex = 0; - - if (relocate) { - for (i = 1; i < hdr->e_shnum; i++) { - if (sechdrs[i].sh_type != SHT_NOBITS - && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) { - printk(KERN_ERR "VPE program length %u truncated\n", - len); - return -ENOEXEC; - } - - /* Mark all sections sh_addr with their address in the - temporary image. */ - sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset; - - /* Internal symbols and strings. */ - if (sechdrs[i].sh_type == SHT_SYMTAB) { - symindex = i; - strindex = sechdrs[i].sh_link; - strtab = (char *)hdr + sechdrs[strindex].sh_offset; - } - } - layout_sections(&mod, hdr, sechdrs, secstrings); - } - - v->load_addr = alloc_progmem(mod.core_size); - if (!v->load_addr) - return -ENOMEM; - - pr_info("VPE loader: loading to %p\n", v->load_addr); - - if (relocate) { - for (i = 0; i < hdr->e_shnum; i++) { - void *dest; - - if (!(sechdrs[i].sh_flags & SHF_ALLOC)) - continue; - - dest = v->load_addr + sechdrs[i].sh_entsize; - - if (sechdrs[i].sh_type != SHT_NOBITS) - memcpy(dest, (void *)sechdrs[i].sh_addr, - sechdrs[i].sh_size); - /* Update sh_addr to point to copy in image. */ - sechdrs[i].sh_addr = (unsigned long)dest; - - printk(KERN_DEBUG " section sh_name %s sh_addr 0x%x\n", - secstrings + sechdrs[i].sh_name, sechdrs[i].sh_addr); - } - - /* Fix up syms, so that st_value is a pointer to location. */ - simplify_symbols(sechdrs, symindex, strtab, secstrings, - hdr->e_shnum, &mod); - - /* Now do relocations. */ - for (i = 1; i < hdr->e_shnum; i++) { - const char *strtab = (char *)sechdrs[strindex].sh_addr; - unsigned int info = sechdrs[i].sh_info; - - /* Not a valid relocation section? */ - if (info >= hdr->e_shnum) - continue; - - /* Don't bother with non-allocated sections */ - if (!(sechdrs[info].sh_flags & SHF_ALLOC)) - continue; - - if (sechdrs[i].sh_type == SHT_REL) - err = apply_relocations(sechdrs, strtab, symindex, i, - &mod); - else if (sechdrs[i].sh_type == SHT_RELA) - err = apply_relocate_add(sechdrs, strtab, symindex, i, - &mod); - if (err < 0) - return err; - - } - } else { - struct elf_phdr *phdr = (struct elf_phdr *) ((char *)hdr + hdr->e_phoff); - - for (i = 0; i < hdr->e_phnum; i++) { - if (phdr->p_type == PT_LOAD) { - memcpy((void *)phdr->p_paddr, - (char *)hdr + phdr->p_offset, - phdr->p_filesz); - memset((void *)phdr->p_paddr + phdr->p_filesz, - 0, phdr->p_memsz - phdr->p_filesz); - } - phdr++; - } - - for (i = 0; i < hdr->e_shnum; i++) { - /* Internal symbols and strings. */ - if (sechdrs[i].sh_type == SHT_SYMTAB) { - symindex = i; - strindex = sechdrs[i].sh_link; - strtab = (char *)hdr + sechdrs[strindex].sh_offset; - - /* mark the symtab's address for when we try to find the - magic symbols */ - sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset; - } - } - } - - /* make sure it's physically written out */ - flush_icache_range((unsigned long)v->load_addr, - (unsigned long)v->load_addr + v->len); - - if ((find_vpe_symbols(v, sechdrs, symindex, strtab, &mod)) < 0) { - if (v->__start == 0) { - printk(KERN_WARNING "VPE loader: program does not contain " - "a __start symbol\n"); - return -ENOEXEC; - } - - if (v->shared_ptr == NULL) - printk(KERN_WARNING "VPE loader: " - "program does not contain vpe_shared symbol.\n" - " Unable to use AMVP (AP/SP) facilities.\n"); - } - - printk(" elf loaded\n"); - return 0; -} - -static void cleanup_tc(struct tc *tc) -{ - unsigned long flags; - unsigned int mtflags, vpflags; - int tmp; - - local_irq_save(flags); - mtflags = dmt(); - vpflags = dvpe(); - /* Put MVPE's into 'configuration state' */ - set_c0_mvpcontrol(MVPCONTROL_VPC); - - settc(tc->index); - tmp = read_tc_c0_tcstatus(); - - /* mark not allocated and not dynamically allocatable */ - tmp &= ~(TCSTATUS_A | TCSTATUS_DA); - tmp |= TCSTATUS_IXMT; /* interrupt exempt */ - write_tc_c0_tcstatus(tmp); - - write_tc_c0_tchalt(TCHALT_H); - mips_ihb(); - - /* bind it to anything other than VPE1 */ -// write_tc_c0_tcbind(read_tc_c0_tcbind() & ~TCBIND_CURVPE); // | TCBIND_CURVPE - - clear_c0_mvpcontrol(MVPCONTROL_VPC); - evpe(vpflags); - emt(mtflags); - local_irq_restore(flags); -} - -static int getcwd(char *buff, int size) -{ - mm_segment_t old_fs; - int ret; - - old_fs = get_fs(); - set_fs(KERNEL_DS); - - ret = sys_getcwd(buff, size); - - set_fs(old_fs); - - return ret; -} - -/* checks VPE is unused and gets ready to load program */ -static int vpe_open(struct inode *inode, struct file *filp) -{ - enum vpe_state state; - struct vpe_notifications *not; - struct vpe *v; - int ret; - - if (minor != iminor(inode)) { - /* assume only 1 device at the moment. */ - pr_warning("VPE loader: only vpe1 is supported\n"); - - return -ENODEV; - } - - if ((v = get_vpe(tclimit)) == NULL) { - pr_warning("VPE loader: unable to get vpe\n"); - - return -ENODEV; - } - - state = xchg(&v->state, VPE_STATE_INUSE); - if (state != VPE_STATE_UNUSED) { - printk(KERN_DEBUG "VPE loader: tc in use dumping regs\n"); - - list_for_each_entry(not, &v->notify, list) { - not->stop(tclimit); - } - - release_progmem(v->load_addr); - cleanup_tc(get_tc(tclimit)); - } - - /* this of-course trashes what was there before... */ - v->pbuffer = vmalloc(P_SIZE); - if (!v->pbuffer) { - pr_warning("VPE loader: unable to allocate memory\n"); - return -ENOMEM; - } - v->plen = P_SIZE; - v->load_addr = NULL; - v->len = 0; - - v->uid = filp->f_cred->fsuid; - v->gid = filp->f_cred->fsgid; - - v->cwd[0] = 0; - ret = getcwd(v->cwd, VPE_PATH_MAX); - if (ret < 0) - printk(KERN_WARNING "VPE loader: open, getcwd returned %d\n", ret); - - v->shared_ptr = NULL; - v->__start = 0; - - return 0; -} - -static int vpe_release(struct inode *inode, struct file *filp) -{ - struct vpe *v; - Elf_Ehdr *hdr; - int ret = 0; - - v = get_vpe(tclimit); - if (v == NULL) - return -ENODEV; - - hdr = (Elf_Ehdr *) v->pbuffer; - if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) == 0) { - if (vpe_elfload(v) >= 0) { - vpe_run(v); - } else { - printk(KERN_WARNING "VPE loader: ELF load failed.\n"); - ret = -ENOEXEC; - } - } else { - printk(KERN_WARNING "VPE loader: only elf files are supported\n"); - ret = -ENOEXEC; - } - - /* It's good to be able to run the SP and if it chokes have a look at - the /dev/rt?. But if we reset the pointer to the shared struct we - lose what has happened. So perhaps if garbage is sent to the vpe - device, use it as a trigger for the reset. Hopefully a nice - executable will be along shortly. */ - if (ret < 0) - v->shared_ptr = NULL; - - vfree(v->pbuffer); - v->plen = 0; - - return ret; -} - -static ssize_t vpe_write(struct file *file, const char __user * buffer, - size_t count, loff_t * ppos) -{ - size_t ret = count; - struct vpe *v; - - if (iminor(file->f_path.dentry->d_inode) != minor) - return -ENODEV; - - v = get_vpe(tclimit); - if (v == NULL) - return -ENODEV; - - if ((count + v->len) > v->plen) { - printk(KERN_WARNING - "VPE loader: elf size too big. Perhaps strip uneeded symbols\n"); - return -ENOMEM; - } - - count -= copy_from_user(v->pbuffer + v->len, buffer, count); - if (!count) - return -EFAULT; - - v->len += count; - return ret; -} - -static const struct file_operations vpe_fops = { - .owner = THIS_MODULE, - .open = vpe_open, - .release = vpe_release, - .write = vpe_write, - .llseek = noop_llseek, -}; - -/* module wrapper entry points */ -/* give me a vpe */ -vpe_handle vpe_alloc(void) -{ - int i; - struct vpe *v; - - /* find a vpe */ - for (i = 1; i < MAX_VPES; i++) { - if ((v = get_vpe(i)) != NULL) { - v->state = VPE_STATE_INUSE; - return v; - } - } - return NULL; -} - -EXPORT_SYMBOL(vpe_alloc); - -/* start running from here */ -int vpe_start(vpe_handle vpe, unsigned long start) -{ - struct vpe *v = vpe; - - v->__start = start; - return vpe_run(v); -} - -EXPORT_SYMBOL(vpe_start); - -/* halt it for now */ -int vpe_stop(vpe_handle vpe) -{ - struct vpe *v = vpe; - struct tc *t; - unsigned int evpe_flags; - - evpe_flags = dvpe(); - - if ((t = list_entry(v->tc.next, struct tc, tc)) != NULL) { - - settc(t->index); - write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA); - } - - evpe(evpe_flags); - - return 0; -} - -EXPORT_SYMBOL(vpe_stop); - -/* I've done with it thank you */ -int vpe_free(vpe_handle vpe) -{ - struct vpe *v = vpe; - struct tc *t; - unsigned int evpe_flags; - - if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) { - return -ENOEXEC; - } - - evpe_flags = dvpe(); - - /* Put MVPE's into 'configuration state' */ - set_c0_mvpcontrol(MVPCONTROL_VPC); - - settc(t->index); - write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA); - - /* halt the TC */ - write_tc_c0_tchalt(TCHALT_H); - mips_ihb(); - - /* mark the TC unallocated */ - write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A); - - v->state = VPE_STATE_UNUSED; - - clear_c0_mvpcontrol(MVPCONTROL_VPC); - evpe(evpe_flags); - - return 0; -} - -EXPORT_SYMBOL(vpe_free); - -void *vpe_get_shared(int index) -{ - struct vpe *v; - - if ((v = get_vpe(index)) == NULL) - return NULL; - - return v->shared_ptr; -} - -EXPORT_SYMBOL(vpe_get_shared); - -int vpe_getuid(int index) -{ - struct vpe *v; - - if ((v = get_vpe(index)) == NULL) - return -1; - - return v->uid; -} - -EXPORT_SYMBOL(vpe_getuid); - -int vpe_getgid(int index) -{ - struct vpe *v; - - if ((v = get_vpe(index)) == NULL) - return -1; - - return v->gid; -} - -EXPORT_SYMBOL(vpe_getgid); - -int vpe_notify(int index, struct vpe_notifications *notify) -{ - struct vpe *v; - - if ((v = get_vpe(index)) == NULL) - return -1; - - list_add(¬ify->list, &v->notify); - return 0; -} - -EXPORT_SYMBOL(vpe_notify); - -char *vpe_getcwd(int index) -{ - struct vpe *v; - - if ((v = get_vpe(index)) == NULL) - return NULL; - - return v->cwd; -} - -EXPORT_SYMBOL(vpe_getcwd); - -static ssize_t store_kill(struct device *dev, struct device_attribute *attr, - const char *buf, size_t len) -{ - struct vpe *vpe = get_vpe(tclimit); - struct vpe_notifications *not; - - list_for_each_entry(not, &vpe->notify, list) { - not->stop(tclimit); - } - - release_progmem(vpe->load_addr); - cleanup_tc(get_tc(tclimit)); - vpe_stop(vpe); - vpe_free(vpe); - - return len; -} - -static ssize_t show_ntcs(struct device *cd, struct device_attribute *attr, - char *buf) -{ - struct vpe *vpe = get_vpe(tclimit); - - return sprintf(buf, "%d\n", vpe->ntcs); -} - -static ssize_t store_ntcs(struct device *dev, struct device_attribute *attr, - const char *buf, size_t len) -{ - struct vpe *vpe = get_vpe(tclimit); - unsigned long new; - char *endp; - - new = simple_strtoul(buf, &endp, 0); - if (endp == buf) - goto out_einval; - - if (new == 0 || new > (hw_tcs - tclimit)) - goto out_einval; - - vpe->ntcs = new; - - return len; - -out_einval: - return -EINVAL; -} - -static struct device_attribute vpe_class_attributes[] = { - __ATTR(kill, S_IWUSR, NULL, store_kill), - __ATTR(ntcs, S_IRUGO | S_IWUSR, show_ntcs, store_ntcs), - {} -}; - -static void vpe_device_release(struct device *cd) -{ - kfree(cd); -} - -struct class vpe_class = { - .name = "vpe", - .owner = THIS_MODULE, - .dev_release = vpe_device_release, - .dev_attrs = vpe_class_attributes, -}; - -struct device vpe_device; - -static int __init vpe_module_init(void) -{ - unsigned int mtflags, vpflags; - unsigned long flags, val; - struct vpe *v = NULL; - struct tc *t; - int tc, err; - - if (!cpu_has_mipsmt) { - printk("VPE loader: not a MIPS MT capable processor\n"); - return -ENODEV; - } - - if (vpelimit == 0) { - printk(KERN_WARNING "No VPEs reserved for AP/SP, not " - "initializing VPE loader.\nPass maxvpes= argument as " - "kernel argument\n"); - - return -ENODEV; - } - - if (tclimit == 0) { - printk(KERN_WARNING "No TCs reserved for AP/SP, not " - "initializing VPE loader.\nPass maxtcs= argument as " - "kernel argument\n"); - - return -ENODEV; - } - - major = register_chrdev(0, module_name, &vpe_fops); - if (major < 0) { - printk("VPE loader: unable to register character device\n"); - return major; - } - - err = class_register(&vpe_class); - if (err) { - printk(KERN_ERR "vpe_class registration failed\n"); - goto out_chrdev; - } - - device_initialize(&vpe_device); - vpe_device.class = &vpe_class, - vpe_device.parent = NULL, - dev_set_name(&vpe_device, "vpe1"); - vpe_device.devt = MKDEV(major, minor); - err = device_add(&vpe_device); - if (err) { - printk(KERN_ERR "Adding vpe_device failed\n"); - goto out_class; - } - - local_irq_save(flags); - mtflags = dmt(); - vpflags = dvpe(); - - /* Put MVPE's into 'configuration state' */ - set_c0_mvpcontrol(MVPCONTROL_VPC); - - /* dump_mtregs(); */ - - val = read_c0_mvpconf0(); - hw_tcs = (val & MVPCONF0_PTC) + 1; - hw_vpes = ((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1; - - for (tc = tclimit; tc < hw_tcs; tc++) { - /* - * Must re-enable multithreading temporarily or in case we - * reschedule send IPIs or similar we might hang. - */ - clear_c0_mvpcontrol(MVPCONTROL_VPC); - evpe(vpflags); - emt(mtflags); - local_irq_restore(flags); - t = alloc_tc(tc); - if (!t) { - err = -ENOMEM; - goto out; - } - - local_irq_save(flags); - mtflags = dmt(); - vpflags = dvpe(); - set_c0_mvpcontrol(MVPCONTROL_VPC); - - /* VPE's */ - if (tc < hw_tcs) { - settc(tc); - - if ((v = alloc_vpe(tc)) == NULL) { - printk(KERN_WARNING "VPE: unable to allocate VPE\n"); - - goto out_reenable; - } - - v->ntcs = hw_tcs - tclimit; - - /* add the tc to the list of this vpe's tc's. */ - list_add(&t->tc, &v->tc); - - /* deactivate all but vpe0 */ - if (tc >= tclimit) { - unsigned long tmp = read_vpe_c0_vpeconf0(); - - tmp &= ~VPECONF0_VPA; - - /* master VPE */ - tmp |= VPECONF0_MVP; - write_vpe_c0_vpeconf0(tmp); - } - - /* disable multi-threading with TC's */ - write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE); - - if (tc >= vpelimit) { - /* - * Set config to be the same as vpe0, - * particularly kseg0 coherency alg - */ - write_vpe_c0_config(read_c0_config()); - } - } - - /* TC's */ - t->pvpe = v; /* set the parent vpe */ - - if (tc >= tclimit) { - unsigned long tmp; - - settc(tc); - - /* Any TC that is bound to VPE0 gets left as is - in case - we are running SMTC on VPE0. A TC that is bound to any - other VPE gets bound to VPE0, ideally I'd like to make - it homeless but it doesn't appear to let me bind a TC - to a non-existent VPE. Which is perfectly reasonable. - - The (un)bound state is visible to an EJTAG probe so may - notify GDB... - */ - - if (((tmp = read_tc_c0_tcbind()) & TCBIND_CURVPE)) { - /* tc is bound >vpe0 */ - write_tc_c0_tcbind(tmp & ~TCBIND_CURVPE); - - t->pvpe = get_vpe(0); /* set the parent vpe */ - } - - /* halt the TC */ - write_tc_c0_tchalt(TCHALT_H); - mips_ihb(); - - tmp = read_tc_c0_tcstatus(); - - /* mark not activated and not dynamically allocatable */ - tmp &= ~(TCSTATUS_A | TCSTATUS_DA); - tmp |= TCSTATUS_IXMT; /* interrupt exempt */ - write_tc_c0_tcstatus(tmp); - } - } - -out_reenable: - /* release config state */ - clear_c0_mvpcontrol(MVPCONTROL_VPC); - - evpe(vpflags); - emt(mtflags); - local_irq_restore(flags); - - return 0; - -out_class: - class_unregister(&vpe_class); -out_chrdev: - unregister_chrdev(major, module_name); - -out: - return err; -} - -static void __exit vpe_module_exit(void) -{ - struct vpe *v, *n; - - device_del(&vpe_device); - unregister_chrdev(major, module_name); - - /* No locking needed here */ - list_for_each_entry_safe(v, n, &vpecontrol.vpe_list, list) { - if (v->state != VPE_STATE_UNUSED) - release_vpe(v); - } -} - -module_init(vpe_module_init); -module_exit(vpe_module_exit); -MODULE_DESCRIPTION("MIPS VPE Loader"); -MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc."); -MODULE_LICENSE("GPL"); -- 2.39.5