MIPS: APRP: Split VPE loader into separate files.
Split the VPE functionality in preparation for adding support for CMP platforms. Common functions remain in the original file and a new file contains code specific to platforms that do not have a CMP present. Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@imgtec.com> Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com> Reviewed-by: Qais Yousef <Qais.Yousef@imgtec.com> Signed-off-by: John Crispin <blogic@openwrt.org> Patchwork: http://patchwork.linux-mips.org/patch/6094/
This commit is contained in:
Deng-Cheng Zhu
Ralf Baechle
parent
c080faa502
commit
1a2a6d7e88
5 changed files with 660 additions and 633 deletions
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@ -1907,6 +1907,11 @@ config MIPS_VPE_LOADER
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Includes a loader for loading an elf relocatable object
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onto another VPE and running it.
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config MIPS_VPE_LOADER_MT
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bool
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default "y"
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depends on MIPS_VPE_LOADER && !MIPS_CMP
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config MIPS_MT_SMTC_IM_BACKSTOP
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bool "Use per-TC register bits as backstop for inhibited IM bits"
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depends on MIPS_MT_SMTC
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@ -1,5 +1,6 @@
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/*
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* Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved.
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* Copyright (C) 2013 Imagination Technologies Ltd.
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*
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* This program is free software; you can distribute it and/or modify it
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* under the terms of the GNU General Public License (Version 2) as
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@ -19,6 +20,88 @@
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#ifndef _ASM_VPE_H
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#define _ASM_VPE_H
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/smp.h>
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#include <linux/spinlock.h>
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#define VPE_MODULE_NAME "vpe"
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#define VPE_MODULE_MINOR 1
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/* grab the likely amount of memory we will need. */
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#ifdef CONFIG_MIPS_VPE_LOADER_TOM
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#define P_SIZE (2 * 1024 * 1024)
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#else
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/* add an overhead to the max kmalloc size for non-striped symbols/etc */
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#define P_SIZE (256 * 1024)
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#endif
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#define MAX_VPES 16
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#define VPE_PATH_MAX 256
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static inline int aprp_cpu_index(void)
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{
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#ifdef CONFIG_MIPS_CMP
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return setup_max_cpus;
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#else
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extern int tclimit;
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return tclimit;
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#endif
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}
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enum vpe_state {
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VPE_STATE_UNUSED = 0,
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VPE_STATE_INUSE,
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VPE_STATE_RUNNING
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};
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enum tc_state {
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TC_STATE_UNUSED = 0,
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TC_STATE_INUSE,
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TC_STATE_RUNNING,
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TC_STATE_DYNAMIC
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};
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struct vpe {
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enum vpe_state state;
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/* (device) minor associated with this vpe */
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int minor;
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/* elfloader stuff */
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void *load_addr;
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unsigned long len;
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char *pbuffer;
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unsigned long plen;
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unsigned int uid, gid;
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char cwd[VPE_PATH_MAX];
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unsigned long __start;
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/* tc's associated with this vpe */
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struct list_head tc;
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/* The list of vpe's */
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struct list_head list;
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/* shared symbol address */
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void *shared_ptr;
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/* the list of who wants to know when something major happens */
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struct list_head notify;
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unsigned int ntcs;
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};
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struct tc {
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enum tc_state state;
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int index;
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struct vpe *pvpe; /* parent VPE */
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struct list_head tc; /* The list of TC's with this VPE */
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struct list_head list; /* The global list of tc's */
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};
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struct vpe_notifications {
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void (*start)(int vpe);
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void (*stop)(int vpe);
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@ -26,12 +109,36 @@ struct vpe_notifications {
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struct list_head list;
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};
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struct vpe_control {
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spinlock_t vpe_list_lock;
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struct list_head vpe_list; /* Virtual processing elements */
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spinlock_t tc_list_lock;
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struct list_head tc_list; /* Thread contexts */
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};
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extern int vpe_notify(int index, struct vpe_notifications *notify);
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extern unsigned long physical_memsize;
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extern struct vpe_control vpecontrol;
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extern const struct file_operations vpe_fops;
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extern void *vpe_get_shared(int index);
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extern int vpe_getuid(int index);
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extern int vpe_getgid(int index);
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extern char *vpe_getcwd(int index);
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int vpe_notify(int index, struct vpe_notifications *notify);
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void *vpe_get_shared(int index);
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int vpe_getuid(int index);
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int vpe_getgid(int index);
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char *vpe_getcwd(int index);
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struct vpe *get_vpe(int minor);
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struct tc *get_tc(int index);
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struct vpe *alloc_vpe(int minor);
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struct tc *alloc_tc(int index);
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void release_vpe(struct vpe *v);
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void *alloc_progmem(unsigned long len);
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void release_progmem(void *ptr);
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int __weak vpe_run(struct vpe *v);
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void cleanup_tc(struct tc *tc);
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int __init vpe_module_init(void);
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void __exit vpe_module_exit(void);
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#endif /* _ASM_VPE_H */
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@ -56,6 +56,7 @@ obj-$(CONFIG_MIPS_CMP) += smp-cmp.o
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obj-$(CONFIG_CPU_MIPSR2) += spram.o
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obj-$(CONFIG_MIPS_VPE_LOADER) += vpe.o
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obj-$(CONFIG_MIPS_VPE_LOADER_MT) += vpe-mt.o
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obj-$(CONFIG_MIPS_VPE_APSP_API) += rtlx.o
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obj-$(CONFIG_I8259) += i8259.o
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523
arch/mips/kernel/vpe-mt.c
Normal file
523
arch/mips/kernel/vpe-mt.c
Normal file
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@ -0,0 +1,523 @@
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2004, 2005 MIPS Technologies, Inc. All rights reserved.
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* Copyright (C) 2013 Imagination Technologies Ltd.
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*/
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <asm/mipsregs.h>
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#include <asm/mipsmtregs.h>
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#include <asm/mips_mt.h>
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#include <asm/vpe.h>
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static int major;
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/* The number of TCs and VPEs physically available on the core */
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static int hw_tcs, hw_vpes;
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/* We are prepared so configure and start the VPE... */
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int vpe_run(struct vpe *v)
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{
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unsigned long flags, val, dmt_flag;
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struct vpe_notifications *n;
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unsigned int vpeflags;
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struct tc *t;
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/* check we are the Master VPE */
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local_irq_save(flags);
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val = read_c0_vpeconf0();
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if (!(val & VPECONF0_MVP)) {
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pr_warn("VPE loader: only Master VPE's are able to config MT\n");
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local_irq_restore(flags);
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return -1;
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}
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dmt_flag = dmt();
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vpeflags = dvpe();
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if (list_empty(&v->tc)) {
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evpe(vpeflags);
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emt(dmt_flag);
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local_irq_restore(flags);
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pr_warn("VPE loader: No TC's associated with VPE %d\n",
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v->minor);
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return -ENOEXEC;
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}
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t = list_first_entry(&v->tc, struct tc, tc);
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/* Put MVPE's into 'configuration state' */
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set_c0_mvpcontrol(MVPCONTROL_VPC);
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settc(t->index);
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/* should check it is halted, and not activated */
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if ((read_tc_c0_tcstatus() & TCSTATUS_A) ||
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!(read_tc_c0_tchalt() & TCHALT_H)) {
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evpe(vpeflags);
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emt(dmt_flag);
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local_irq_restore(flags);
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pr_warn("VPE loader: TC %d is already active!\n",
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t->index);
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return -ENOEXEC;
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}
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/*
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* Write the address we want it to start running from in the TCPC
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* register.
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*/
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write_tc_c0_tcrestart((unsigned long)v->__start);
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write_tc_c0_tccontext((unsigned long)0);
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/*
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* Mark the TC as activated, not interrupt exempt and not dynamically
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* allocatable
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*/
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val = read_tc_c0_tcstatus();
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val = (val & ~(TCSTATUS_DA | TCSTATUS_IXMT)) | TCSTATUS_A;
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write_tc_c0_tcstatus(val);
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write_tc_c0_tchalt(read_tc_c0_tchalt() & ~TCHALT_H);
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/*
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* The sde-kit passes 'memsize' to __start in $a3, so set something
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* here... Or set $a3 to zero and define DFLT_STACK_SIZE and
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* DFLT_HEAP_SIZE when you compile your program
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*/
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mttgpr(6, v->ntcs);
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mttgpr(7, physical_memsize);
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/* set up VPE1 */
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/*
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* bind the TC to VPE 1 as late as possible so we only have the final
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* VPE registers to set up, and so an EJTAG probe can trigger on it
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*/
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write_tc_c0_tcbind((read_tc_c0_tcbind() & ~TCBIND_CURVPE) | 1);
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write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~(VPECONF0_VPA));
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back_to_back_c0_hazard();
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/* Set up the XTC bit in vpeconf0 to point at our tc */
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write_vpe_c0_vpeconf0((read_vpe_c0_vpeconf0() & ~(VPECONF0_XTC))
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| (t->index << VPECONF0_XTC_SHIFT));
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back_to_back_c0_hazard();
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/* enable this VPE */
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write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA);
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/* clear out any left overs from a previous program */
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write_vpe_c0_status(0);
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write_vpe_c0_cause(0);
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/* take system out of configuration state */
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clear_c0_mvpcontrol(MVPCONTROL_VPC);
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/*
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* SMTC/SMVP kernels manage VPE enable independently,
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* but uniprocessor kernels need to turn it on, even
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* if that wasn't the pre-dvpe() state.
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*/
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#ifdef CONFIG_SMP
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evpe(vpeflags);
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#else
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evpe(EVPE_ENABLE);
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#endif
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emt(dmt_flag);
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local_irq_restore(flags);
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list_for_each_entry(n, &v->notify, list)
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n->start(VPE_MODULE_MINOR);
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return 0;
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}
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void cleanup_tc(struct tc *tc)
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{
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unsigned long flags;
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unsigned int mtflags, vpflags;
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int tmp;
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local_irq_save(flags);
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mtflags = dmt();
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vpflags = dvpe();
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/* Put MVPE's into 'configuration state' */
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set_c0_mvpcontrol(MVPCONTROL_VPC);
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settc(tc->index);
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tmp = read_tc_c0_tcstatus();
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/* mark not allocated and not dynamically allocatable */
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tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
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tmp |= TCSTATUS_IXMT; /* interrupt exempt */
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write_tc_c0_tcstatus(tmp);
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write_tc_c0_tchalt(TCHALT_H);
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mips_ihb();
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clear_c0_mvpcontrol(MVPCONTROL_VPC);
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evpe(vpflags);
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emt(mtflags);
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local_irq_restore(flags);
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}
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/* module wrapper entry points */
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/* give me a vpe */
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void *vpe_alloc(void)
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{
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int i;
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struct vpe *v;
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/* find a vpe */
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for (i = 1; i < MAX_VPES; i++) {
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v = get_vpe(i);
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if (v != NULL) {
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v->state = VPE_STATE_INUSE;
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return v;
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}
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}
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return NULL;
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}
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EXPORT_SYMBOL(vpe_alloc);
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/* start running from here */
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int vpe_start(void *vpe, unsigned long start)
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{
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struct vpe *v = vpe;
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v->__start = start;
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return vpe_run(v);
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}
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EXPORT_SYMBOL(vpe_start);
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/* halt it for now */
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int vpe_stop(void *vpe)
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{
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struct vpe *v = vpe;
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struct tc *t;
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unsigned int evpe_flags;
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evpe_flags = dvpe();
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t = list_entry(v->tc.next, struct tc, tc);
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if (t != NULL) {
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settc(t->index);
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write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);
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}
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evpe(evpe_flags);
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return 0;
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}
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EXPORT_SYMBOL(vpe_stop);
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/* I've done with it thank you */
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int vpe_free(void *vpe)
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{
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struct vpe *v = vpe;
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struct tc *t;
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unsigned int evpe_flags;
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t = list_entry(v->tc.next, struct tc, tc);
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if (t == NULL)
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return -ENOEXEC;
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evpe_flags = dvpe();
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/* Put MVPE's into 'configuration state' */
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set_c0_mvpcontrol(MVPCONTROL_VPC);
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settc(t->index);
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write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);
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/* halt the TC */
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write_tc_c0_tchalt(TCHALT_H);
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mips_ihb();
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/* mark the TC unallocated */
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write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A);
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v->state = VPE_STATE_UNUSED;
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clear_c0_mvpcontrol(MVPCONTROL_VPC);
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evpe(evpe_flags);
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return 0;
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}
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EXPORT_SYMBOL(vpe_free);
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static ssize_t store_kill(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct vpe *vpe = get_vpe(aprp_cpu_index());
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struct vpe_notifications *notifier;
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list_for_each_entry(notifier, &vpe->notify, list)
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notifier->stop(aprp_cpu_index());
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release_progmem(vpe->load_addr);
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cleanup_tc(get_tc(aprp_cpu_index()));
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vpe_stop(vpe);
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vpe_free(vpe);
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return len;
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}
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static DEVICE_ATTR(kill, S_IWUSR, NULL, store_kill);
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static ssize_t ntcs_show(struct device *cd, struct device_attribute *attr,
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char *buf)
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{
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struct vpe *vpe = get_vpe(aprp_cpu_index());
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return sprintf(buf, "%d\n", vpe->ntcs);
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}
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static ssize_t ntcs_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct vpe *vpe = get_vpe(aprp_cpu_index());
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unsigned long new;
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int ret;
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ret = kstrtoul(buf, 0, &new);
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if (ret < 0)
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return ret;
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if (new == 0 || new > (hw_tcs - aprp_cpu_index()))
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return -EINVAL;
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vpe->ntcs = new;
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return len;
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}
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static DEVICE_ATTR_RW(ntcs);
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static struct attribute *vpe_attrs[] = {
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&dev_attr_kill.attr,
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&dev_attr_ntcs.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(vpe);
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static void vpe_device_release(struct device *cd)
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{
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kfree(cd);
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}
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static struct class vpe_class = {
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.name = "vpe",
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.owner = THIS_MODULE,
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.dev_release = vpe_device_release,
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.dev_groups = vpe_groups,
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};
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|
||||
static struct device vpe_device;
|
||||
|
||||
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) {
|
||||
pr_warn("VPE loader: not a MIPS MT capable processor\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
if (vpelimit == 0) {
|
||||
pr_warn("No VPEs reserved for AP/SP, not initialize VPE loader\n"
|
||||
"Pass maxvpes=<n> argument as kernel argument\n");
|
||||
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
if (aprp_cpu_index() == 0) {
|
||||
pr_warn("No TCs reserved for AP/SP, not initialize VPE loader\n"
|
||||
"Pass maxtcs=<n> argument as kernel argument\n");
|
||||
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
major = register_chrdev(0, VPE_MODULE_NAME, &vpe_fops);
|
||||
if (major < 0) {
|
||||
pr_warn("VPE loader: unable to register character device\n");
|
||||
return major;
|
||||
}
|
||||
|
||||
err = class_register(&vpe_class);
|
||||
if (err) {
|
||||
pr_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, VPE_MODULE_MINOR);
|
||||
err = device_add(&vpe_device);
|
||||
if (err) {
|
||||
pr_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);
|
||||
|
||||
val = read_c0_mvpconf0();
|
||||
hw_tcs = (val & MVPCONF0_PTC) + 1;
|
||||
hw_vpes = ((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1;
|
||||
|
||||
for (tc = aprp_cpu_index(); 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_dev;
|
||||
}
|
||||
|
||||
local_irq_save(flags);
|
||||
mtflags = dmt();
|
||||
vpflags = dvpe();
|
||||
set_c0_mvpcontrol(MVPCONTROL_VPC);
|
||||
|
||||
/* VPE's */
|
||||
if (tc < hw_tcs) {
|
||||
settc(tc);
|
||||
|
||||
v = alloc_vpe(tc);
|
||||
if (v == NULL) {
|
||||
pr_warn("VPE: unable to allocate VPE\n");
|
||||
goto out_reenable;
|
||||
}
|
||||
|
||||
v->ntcs = hw_tcs - aprp_cpu_index();
|
||||
|
||||
/* add the tc to the list of this vpe's tc's. */
|
||||
list_add(&t->tc, &v->tc);
|
||||
|
||||
/* deactivate all but vpe0 */
|
||||
if (tc >= aprp_cpu_index()) {
|
||||
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 >= aprp_cpu_index()) {
|
||||
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...
|
||||
*/
|
||||
tmp = read_tc_c0_tcbind();
|
||||
if (tmp & 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_dev:
|
||||
device_del(&vpe_device);
|
||||
|
||||
out_class:
|
||||
class_unregister(&vpe_class);
|
||||
|
||||
out_chrdev:
|
||||
unregister_chrdev(major, VPE_MODULE_NAME);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
void __exit vpe_module_exit(void)
|
||||
{
|
||||
struct vpe *v, *n;
|
||||
|
||||
device_del(&vpe_device);
|
||||
class_unregister(&vpe_class);
|
||||
unregister_chrdev(major, VPE_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);
|
||||
}
|
||||
}
|
||||
|
|
@ -51,8 +51,6 @@
|
|||
#include <asm/processor.h>
|
||||
#include <asm/vpe.h>
|
||||
|
||||
typedef void *vpe_handle;
|
||||
|
||||
#ifndef ARCH_SHF_SMALL
|
||||
#define ARCH_SHF_SMALL 0
|
||||
#endif
|
||||
|
|
@ -60,96 +58,15 @@ typedef void *vpe_handle;
|
|||
/* 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 = {
|
||||
struct vpe_control 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 *get_vpe(int minor)
|
||||
{
|
||||
struct vpe *res, *v;
|
||||
|
||||
|
|
@ -159,7 +76,7 @@ static struct vpe *get_vpe(int minor)
|
|||
res = NULL;
|
||||
spin_lock(&vpecontrol.vpe_list_lock);
|
||||
list_for_each_entry(v, &vpecontrol.vpe_list, list) {
|
||||
if (v->minor == minor) {
|
||||
if (v->minor == VPE_MODULE_MINOR) {
|
||||
res = v;
|
||||
break;
|
||||
}
|
||||
|
|
@ -170,7 +87,7 @@ static struct vpe *get_vpe(int minor)
|
|||
}
|
||||
|
||||
/* get the vpe associated with this minor */
|
||||
static struct tc *get_tc(int index)
|
||||
struct tc *get_tc(int index)
|
||||
{
|
||||
struct tc *res, *t;
|
||||
|
||||
|
|
@ -188,7 +105,7 @@ static struct tc *get_tc(int index)
|
|||
}
|
||||
|
||||
/* allocate a vpe and associate it with this minor (or index) */
|
||||
static struct vpe *alloc_vpe(int minor)
|
||||
struct vpe *alloc_vpe(int minor)
|
||||
{
|
||||
struct vpe *v;
|
||||
|
||||
|
|
@ -201,13 +118,13 @@ static struct vpe *alloc_vpe(int minor)
|
|||
spin_unlock(&vpecontrol.vpe_list_lock);
|
||||
|
||||
INIT_LIST_HEAD(&v->notify);
|
||||
v->minor = minor;
|
||||
v->minor = VPE_MODULE_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 *alloc_tc(int index)
|
||||
{
|
||||
struct tc *tc;
|
||||
|
||||
|
|
@ -226,7 +143,7 @@ out:
|
|||
}
|
||||
|
||||
/* clean up and free everything */
|
||||
static void release_vpe(struct vpe *v)
|
||||
void release_vpe(struct vpe *v)
|
||||
{
|
||||
list_del(&v->list);
|
||||
if (v->load_addr)
|
||||
|
|
@ -234,28 +151,8 @@ static void release_vpe(struct vpe *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 *alloc_progmem(unsigned long len)
|
||||
{
|
||||
void *addr;
|
||||
|
||||
|
|
@ -274,7 +171,7 @@ static void *alloc_progmem(unsigned long len)
|
|||
return addr;
|
||||
}
|
||||
|
||||
static void release_progmem(void *ptr)
|
||||
void release_progmem(void *ptr)
|
||||
{
|
||||
#ifndef CONFIG_MIPS_VPE_LOADER_TOM
|
||||
kfree(ptr);
|
||||
|
|
@ -675,127 +572,6 @@ static void dump_elfsymbols(Elf_Shdr * sechdrs, unsigned int symindex,
|
|||
}
|
||||
#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)) {
|
||||
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;
|
||||
}
|
||||
|
||||
t = list_first_entry(&v->tc, struct tc, tc);
|
||||
|
||||
/* 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)
|
||||
|
|
@ -993,38 +769,6 @@ static int vpe_elfload(struct vpe * v)
|
|||
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;
|
||||
|
|
@ -1048,14 +792,14 @@ static int vpe_open(struct inode *inode, struct file *filp)
|
|||
struct vpe *v;
|
||||
int ret;
|
||||
|
||||
if (minor != iminor(inode)) {
|
||||
if (VPE_MODULE_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) {
|
||||
if ((v = get_vpe(aprp_cpu_index())) == NULL) {
|
||||
pr_warning("VPE loader: unable to get vpe\n");
|
||||
|
||||
return -ENODEV;
|
||||
|
|
@ -1066,11 +810,11 @@ static int vpe_open(struct inode *inode, struct file *filp)
|
|||
printk(KERN_DEBUG "VPE loader: tc in use dumping regs\n");
|
||||
|
||||
list_for_each_entry(not, &v->notify, list) {
|
||||
not->stop(tclimit);
|
||||
not->stop(aprp_cpu_index());
|
||||
}
|
||||
|
||||
release_progmem(v->load_addr);
|
||||
cleanup_tc(get_tc(tclimit));
|
||||
cleanup_tc(get_tc(aprp_cpu_index()));
|
||||
}
|
||||
|
||||
/* this of-course trashes what was there before... */
|
||||
|
|
@ -1103,13 +847,13 @@ static int vpe_release(struct inode *inode, struct file *filp)
|
|||
Elf_Ehdr *hdr;
|
||||
int ret = 0;
|
||||
|
||||
v = get_vpe(tclimit);
|
||||
v = get_vpe(aprp_cpu_index());
|
||||
if (v == NULL)
|
||||
return -ENODEV;
|
||||
|
||||
hdr = (Elf_Ehdr *) v->pbuffer;
|
||||
if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) == 0) {
|
||||
if (vpe_elfload(v) >= 0) {
|
||||
if ((vpe_elfload(v) >= 0) && vpe_run) {
|
||||
vpe_run(v);
|
||||
} else {
|
||||
printk(KERN_WARNING "VPE loader: ELF load failed.\n");
|
||||
|
|
@ -1140,10 +884,10 @@ static ssize_t vpe_write(struct file *file, const char __user * buffer,
|
|||
size_t ret = count;
|
||||
struct vpe *v;
|
||||
|
||||
if (iminor(file_inode(file)) != minor)
|
||||
if (iminor(file_inode(file)) != VPE_MODULE_MINOR)
|
||||
return -ENODEV;
|
||||
|
||||
v = get_vpe(tclimit);
|
||||
v = get_vpe(aprp_cpu_index());
|
||||
if (v == NULL)
|
||||
return -ENODEV;
|
||||
|
||||
|
|
@ -1161,7 +905,7 @@ static ssize_t vpe_write(struct file *file, const char __user * buffer,
|
|||
return ret;
|
||||
}
|
||||
|
||||
static const struct file_operations vpe_fops = {
|
||||
const struct file_operations vpe_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.open = vpe_open,
|
||||
.release = vpe_release,
|
||||
|
|
@ -1169,94 +913,6 @@ static const struct file_operations vpe_fops = {
|
|||
.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;
|
||||
|
|
@ -1318,271 +974,6 @@ char *vpe_getcwd(int index)
|
|||
|
||||
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 DEVICE_ATTR(kill, S_IWUSR, NULL, store_kill);
|
||||
|
||||
static ssize_t ntcs_show(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 ntcs_store(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 DEVICE_ATTR_RW(ntcs);
|
||||
|
||||
static struct attribute *vpe_attrs[] = {
|
||||
&dev_attr_kill.attr,
|
||||
&dev_attr_ntcs.attr,
|
||||
NULL,
|
||||
};
|
||||
ATTRIBUTE_GROUPS(vpe);
|
||||
|
||||
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_groups = vpe_groups,
|
||||
};
|
||||
|
||||
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=<n> 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=<n> 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");
|
||||
|
|
|
|||
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Reference in a new issue