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#include <linux/init.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sysctl.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/mutex.h>
#include <litmus/litmus_proc.h>
#include <litmus/sched_trace.h>
#include <asm/hardware/cache-l2x0.h>
#include <asm/cacheflush.h>
#define UNLOCK_ALL 0x00000000 /* allocation in any way */
#define LOCK_ALL (~UNLOCK_ALL)
#define MAX_NR_WAYS 16
u32 nr_unlocked_way[MAX_NR_WAYS+1] = {
0xFFFFFFFF, /* all ways are locked. usable = 0*/
0xFFFFFFFE, /* way ~0 unlocked. usable = 1 */
0xFFFFFFFC,
0xFFFFFFF8,
0xFFFFFFF0,
0xFFFFFFE0,
0xFFFFFFC0,
0xFFFFFF80,
0xFFFFFF00,
0xFFFFFE00,
0xFFFFFC00,
0xFFFFF800,
0xFFFFF000,
0xFFFFE000,
0xFFFFC000,
0xFFFF8000,
0xFFFF0000, /* way ~15 unlocked. usable = 16 */
};
static void __iomem *cache_base;
static void __iomem *lockreg_d;
static void __iomem *lockreg_i;
static u32 cache_id;
struct mutex actlr_mutex;
struct mutex l2x0_prefetch_mutex;
struct mutex lockdown_proc;
static int min_usable_ways = 0;
static int max_usable_ways = 16;
static int zero = 0;
static int one = 1;
#define ld_d_reg(cpu) ({ int __cpu = cpu; \
void __iomem *__v = cache_base + L2X0_LOCKDOWN_WAY_D_BASE + \
__cpu * L2X0_LOCKDOWN_STRIDE; __v; })
#define ld_i_reg(cpu) ({ int __cpu = cpu; \
void __iomem *__v = cache_base + L2X0_LOCKDOWN_WAY_I_BASE + \
__cpu * L2X0_LOCKDOWN_STRIDE; __v; })
int l2_usable_ways;
int lock_all;
int nr_lockregs;
static void print_lockdown_registers(void)
{
int i;
for (i = 0; i < nr_lockregs; i++) {
printk("Lockdown Data CPU %2d: 0x%8x\n",
i, readl_relaxed(ld_d_reg(i)));
printk("Lockdown Inst CPU %2d: 0x%8x\n",
i, readl_relaxed(ld_i_reg(i)));
}
}
static void test_lockdown(void *ignore)
{
int i;
printk("Start lockdown test on CPU %d.\n", smp_processor_id());
for (i = 0; i < nr_lockregs; i++) {
printk("CPU %2d data reg: 0x%8p\n", i, ld_d_reg(i));
printk("CPU %2d inst reg: 0x%8p\n", i, ld_i_reg(i));
}
printk("Lockdown initial state:\n");
print_lockdown_registers();
printk("---\n");
for (i = 0; i < nr_lockregs; i++) {
writel_relaxed(1, ld_d_reg(i));
writel_relaxed(2, ld_i_reg(i));
}
printk("Lockdown all data=1 instr=2:\n");
print_lockdown_registers();
printk("---\n");
for (i = 0; i < nr_lockregs; i++) {
writel_relaxed((1 << i), ld_d_reg(i));
writel_relaxed(((1 << 8) >> i), ld_i_reg(i));
}
printk("Lockdown varies:\n");
print_lockdown_registers();
printk("---\n");
for (i = 0; i < nr_lockregs; i++) {
writel_relaxed(UNLOCK_ALL, ld_d_reg(i));
writel_relaxed(UNLOCK_ALL, ld_i_reg(i));
}
printk("Lockdown all zero:\n");
print_lockdown_registers();
printk("End lockdown test.\n");
}
void litmus_setup_lockdown(void __iomem *base, u32 id)
{
cache_base = base;
cache_id = id;
lockreg_d = cache_base + L2X0_LOCKDOWN_WAY_D_BASE;
lockreg_i = cache_base + L2X0_LOCKDOWN_WAY_I_BASE;
if (L2X0_CACHE_ID_PART_L310 == (cache_id & L2X0_CACHE_ID_PART_MASK)) {
nr_lockregs = 8;
} else {
printk("Unknown cache ID!\n");
nr_lockregs = 1;
}
mutex_init(&actlr_mutex);
mutex_init(&l2x0_prefetch_mutex);
mutex_init(&lockdown_proc);
test_lockdown(NULL);
}
int lock_all_handler(struct ctl_table *table, int write, void __user *buffer,
size_t *lenp, loff_t *ppos)
{
int ret = 0, i;
mutex_lock(&lockdown_proc);
flush_cache_all();
ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
if (ret)
goto out;
if (write && lock_all == 1) {
for (i = 0; i < nr_lockregs; i++) {
writel_relaxed(nr_unlocked_way[0], ld_d_reg(i));
writel_relaxed(nr_unlocked_way[0], ld_i_reg(i));
}
print_lockdown_registers();
}
out:
mutex_unlock(&lockdown_proc);
return ret;
}
int l2_usable_ways_handler(struct ctl_table *table, int write, void __user *buffer,
size_t *lenp, loff_t *ppos)
{
int ret = 0, i = 0;
mutex_lock(&lockdown_proc);
flush_cache_all();
ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
if (ret)
goto out;
TRACE_CUR("l2_usable_ways : %d\n", l2_usable_ways);
if (write) {
//for (i = 0; i < nr_lockregs; i++) {
writel_relaxed(nr_unlocked_way[l2_usable_ways], ld_d_reg(i));
writel_relaxed(nr_unlocked_way[l2_usable_ways], ld_i_reg(i));
//}
print_lockdown_registers();
}
out:
mutex_unlock(&lockdown_proc);
return ret;
}
static struct ctl_table cache_table[] =
{
{
.procname = "l2_usable_ways",
.mode = 0666,
.proc_handler = l2_usable_ways_handler,
.data = &l2_usable_ways,
.maxlen = sizeof(l2_usable_ways),
.extra1 = &min_usable_ways,
.extra2 = &max_usable_ways,
},
{
.procname = "lock_all",
.mode = 0666,
.proc_handler = lock_all_handler,
.data = &lock_all,
.maxlen = sizeof(lock_all),
.extra1 = &zero,
.extra2 = &one,
},
{ }
};
static struct ctl_table litmus_dir_table[] = {
{
.procname = "litmus",
.mode = 0555,
.child = cache_table,
},
{ }
};
static struct ctl_table_header *litmus_sysctls;
static int __init litmus_sysctl_init(void)
{
int ret = 0;
printk(KERN_INFO "Registering LITMUS^RT proc sysctl.\n");
litmus_sysctls = register_sysctl_table(litmus_dir_table);
if (!litmus_sysctls) {
printk(KERN_WARNING "Could not register LITMUS^RT sysctl.\n");
ret = -EFAULT;
goto out;
}
l2_usable_ways = 16;
out:
return ret;
}
module_init(litmus_sysctl_init);
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