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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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x86 mmiotrace: Use percpu instead of arrays.
Signed-off-by: Pekka Paalanen <pq@iki.fi> Cc: Eric Dumazet <dada1@cosmosbay.com> Cc: pq@iki.fi Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Pekka Paalanen
Thomas Gleixner
parent
10c43d2eb5
commit
f513638030
@ -16,6 +16,7 @@
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#include <linux/uaccess.h>
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#include <linux/ptrace.h>
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#include <linux/preempt.h>
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#include <linux/percpu.h>
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#include <asm/io.h>
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#include <asm/cacheflush.h>
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#include <asm/errno.h>
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@ -49,7 +50,8 @@ static unsigned int handler_registered;
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static struct list_head kmmio_page_table[KMMIO_PAGE_TABLE_SIZE];
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static LIST_HEAD(kmmio_probes);
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static struct kmmio_context kmmio_ctx[NR_CPUS];
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/* Accessed per-cpu */
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static DEFINE_PER_CPU(struct kmmio_context, kmmio_ctx);
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static struct notifier_block nb_die = {
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.notifier_call = kmmio_die_notifier
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@ -173,8 +175,7 @@ static void disarm_kmmio_fault_page(unsigned long page, int *page_level)
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*/
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static int kmmio_handler(struct pt_regs *regs, unsigned long addr)
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{
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struct kmmio_context *ctx;
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int cpu;
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struct kmmio_context *ctx = &get_cpu_var(kmmio_ctx);
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/*
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* Preemption is now disabled to prevent process switch during
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@ -187,8 +188,6 @@ static int kmmio_handler(struct pt_regs *regs, unsigned long addr)
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* And that interrupt triggers a kmmio trap?
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*/
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preempt_disable();
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cpu = smp_processor_id();
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ctx = &kmmio_ctx[cpu];
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/* interrupts disabled and CPU-local data => atomicity guaranteed. */
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if (ctx->active) {
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@ -199,7 +198,7 @@ static int kmmio_handler(struct pt_regs *regs, unsigned long addr)
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*/
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printk(KERN_EMERG "mmiotrace: recursive probe hit on CPU %d, "
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"for address %lu. Ignoring.\n",
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cpu, addr);
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smp_processor_id(), addr);
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goto no_kmmio;
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}
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ctx->active++;
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@ -231,6 +230,7 @@ static int kmmio_handler(struct pt_regs *regs, unsigned long addr)
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/* We hold lock, now we set present bit in PTE and single step. */
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disarm_kmmio_fault_page(ctx->fpage->page, NULL);
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put_cpu_var(kmmio_ctx);
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return 1;
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no_kmmio_locked:
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@ -238,6 +238,7 @@ static int kmmio_handler(struct pt_regs *regs, unsigned long addr)
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ctx->active--;
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no_kmmio:
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preempt_enable_no_resched();
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put_cpu_var(kmmio_ctx);
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/* page fault not handled by kmmio */
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return 0;
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}
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@ -249,11 +250,11 @@ static int kmmio_handler(struct pt_regs *regs, unsigned long addr)
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*/
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static int post_kmmio_handler(unsigned long condition, struct pt_regs *regs)
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{
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int cpu = smp_processor_id();
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struct kmmio_context *ctx = &kmmio_ctx[cpu];
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int ret = 0;
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struct kmmio_context *ctx = &get_cpu_var(kmmio_ctx);
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if (!ctx->active)
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return 0;
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goto out;
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if (ctx->probe && ctx->probe->post_handler)
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ctx->probe->post_handler(ctx->probe, condition, regs);
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@ -273,10 +274,12 @@ static int post_kmmio_handler(unsigned long condition, struct pt_regs *regs)
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* will have TF set, in which case, continue the remaining processing
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* of do_debug, as if this is not a probe hit.
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*/
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if (regs->flags & TF_MASK)
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return 0;
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if (!(regs->flags & TF_MASK))
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ret = 1;
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return 1;
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out:
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put_cpu_var(kmmio_ctx);
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return ret;
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}
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static int add_kmmio_fault_page(unsigned long page)
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@ -30,6 +30,7 @@
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#include <linux/mmiotrace.h>
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#include <asm/e820.h> /* for ISA_START_ADDRESS */
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#include <asm/atomic.h>
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#include <linux/percpu.h>
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#include "kmmio.h"
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#include "pf_in.h"
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@ -49,11 +50,11 @@ struct trap_reason {
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};
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/* Accessed per-cpu. */
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static struct trap_reason pf_reason[NR_CPUS];
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static struct mm_io_header_rw cpu_trace[NR_CPUS];
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static DEFINE_PER_CPU(struct trap_reason, pf_reason);
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static DEFINE_PER_CPU(struct mm_io_header_rw, cpu_trace);
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/* Access to this is not per-cpu. */
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static atomic_t dropped[NR_CPUS];
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static DEFINE_PER_CPU(atomic_t, dropped);
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static struct file_operations mmio_fops = {
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.owner = THIS_MODULE,
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@ -150,15 +151,15 @@ static void print_pte(unsigned long address)
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*/
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static void die_kmmio_nesting_error(struct pt_regs *regs, unsigned long addr)
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{
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const unsigned long cpu = smp_processor_id();
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const struct trap_reason *my_reason = &get_cpu_var(pf_reason);
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printk(KERN_EMERG MODULE_NAME ": unexpected fault for address: %lx, "
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"last fault for address: %lx\n",
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addr, pf_reason[cpu].addr);
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addr, my_reason->addr);
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print_pte(addr);
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#ifdef __i386__
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print_symbol(KERN_EMERG "faulting EIP is at %s\n", regs->ip);
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print_symbol(KERN_EMERG "last faulting EIP was at %s\n",
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pf_reason[cpu].ip);
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my_reason->ip);
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printk(KERN_EMERG
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"eax: %08lx ebx: %08lx ecx: %08lx edx: %08lx\n",
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regs->ax, regs->bx, regs->cx, regs->dx);
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@ -168,100 +169,105 @@ static void die_kmmio_nesting_error(struct pt_regs *regs, unsigned long addr)
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#else
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print_symbol(KERN_EMERG "faulting RIP is at %s\n", regs->ip);
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print_symbol(KERN_EMERG "last faulting RIP was at %s\n",
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pf_reason[cpu].ip);
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my_reason->ip);
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printk(KERN_EMERG "rax: %016lx rcx: %016lx rdx: %016lx\n",
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regs->ax, regs->cx, regs->dx);
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printk(KERN_EMERG "rsi: %016lx rdi: %016lx "
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"rbp: %016lx rsp: %016lx\n",
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regs->si, regs->di, regs->bp, regs->sp);
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#endif
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put_cpu_var(pf_reason);
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BUG();
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}
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static void pre(struct kmmio_probe *p, struct pt_regs *regs,
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unsigned long addr)
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{
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const unsigned long cpu = smp_processor_id();
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struct trap_reason *my_reason = &get_cpu_var(pf_reason);
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struct mm_io_header_rw *my_trace = &get_cpu_var(cpu_trace);
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const unsigned long instptr = instruction_pointer(regs);
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const enum reason_type type = get_ins_type(instptr);
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/* it doesn't make sense to have more than one active trace per cpu */
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if (pf_reason[cpu].active_traces)
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if (my_reason->active_traces)
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die_kmmio_nesting_error(regs, addr);
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else
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pf_reason[cpu].active_traces++;
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my_reason->active_traces++;
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pf_reason[cpu].type = type;
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pf_reason[cpu].addr = addr;
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pf_reason[cpu].ip = instptr;
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my_reason->type = type;
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my_reason->addr = addr;
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my_reason->ip = instptr;
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cpu_trace[cpu].header.type = MMIO_MAGIC;
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cpu_trace[cpu].header.pid = 0;
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cpu_trace[cpu].header.data_len = sizeof(struct mm_io_rw);
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cpu_trace[cpu].rw.address = addr;
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my_trace->header.type = MMIO_MAGIC;
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my_trace->header.pid = 0;
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my_trace->header.data_len = sizeof(struct mm_io_rw);
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my_trace->rw.address = addr;
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/*
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* Only record the program counter when requested.
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* It may taint clean-room reverse engineering.
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*/
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if (trace_pc)
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cpu_trace[cpu].rw.pc = instptr;
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my_trace->rw.pc = instptr;
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else
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cpu_trace[cpu].rw.pc = 0;
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my_trace->rw.pc = 0;
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record_timestamp(&cpu_trace[cpu].header);
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record_timestamp(&my_trace->header);
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switch (type) {
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case REG_READ:
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cpu_trace[cpu].header.type |=
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my_trace->header.type |=
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(MMIO_READ << MMIO_OPCODE_SHIFT) |
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(get_ins_mem_width(instptr) << MMIO_WIDTH_SHIFT);
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break;
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case REG_WRITE:
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cpu_trace[cpu].header.type |=
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my_trace->header.type |=
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(MMIO_WRITE << MMIO_OPCODE_SHIFT) |
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(get_ins_mem_width(instptr) << MMIO_WIDTH_SHIFT);
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cpu_trace[cpu].rw.value = get_ins_reg_val(instptr, regs);
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my_trace->rw.value = get_ins_reg_val(instptr, regs);
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break;
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case IMM_WRITE:
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cpu_trace[cpu].header.type |=
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my_trace->header.type |=
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(MMIO_WRITE << MMIO_OPCODE_SHIFT) |
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(get_ins_mem_width(instptr) << MMIO_WIDTH_SHIFT);
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cpu_trace[cpu].rw.value = get_ins_imm_val(instptr);
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my_trace->rw.value = get_ins_imm_val(instptr);
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break;
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default:
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{
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unsigned char *ip = (unsigned char *)instptr;
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cpu_trace[cpu].header.type |=
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my_trace->header.type |=
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(MMIO_UNKNOWN_OP << MMIO_OPCODE_SHIFT);
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cpu_trace[cpu].rw.value = (*ip) << 16 |
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*(ip + 1) << 8 |
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*(ip + 2);
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my_trace->rw.value = (*ip) << 16 | *(ip + 1) << 8 |
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*(ip + 2);
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}
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}
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put_cpu_var(cpu_trace);
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put_cpu_var(pf_reason);
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}
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static void post(struct kmmio_probe *p, unsigned long condition,
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struct pt_regs *regs)
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{
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const unsigned long cpu = smp_processor_id();
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struct trap_reason *my_reason = &get_cpu_var(pf_reason);
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struct mm_io_header_rw *my_trace = &get_cpu_var(cpu_trace);
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/* this should always return the active_trace count to 0 */
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pf_reason[cpu].active_traces--;
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if (pf_reason[cpu].active_traces) {
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my_reason->active_traces--;
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if (my_reason->active_traces) {
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printk(KERN_EMERG MODULE_NAME ": unexpected post handler");
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BUG();
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}
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switch (pf_reason[cpu].type) {
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switch (my_reason->type) {
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case REG_READ:
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cpu_trace[cpu].rw.value = get_ins_reg_val(pf_reason[cpu].ip,
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regs);
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my_trace->rw.value = get_ins_reg_val(my_reason->ip, regs);
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break;
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default:
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break;
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}
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relay_write(chan, &cpu_trace[cpu], sizeof(struct mm_io_header_rw));
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relay_write(chan, my_trace, sizeof(*my_trace));
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put_cpu_var(cpu_trace);
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put_cpu_var(pf_reason);
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}
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/*
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@ -274,7 +280,7 @@ static int subbuf_start_handler(struct rchan_buf *buf, void *subbuf,
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void *prev_subbuf, size_t prev_padding)
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{
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unsigned int cpu = buf->cpu;
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atomic_t *drop = &dropped[cpu];
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atomic_t *drop = &per_cpu(dropped, cpu);
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int count;
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if (relay_buf_full(buf)) {
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if (atomic_inc_return(drop) == 1) {
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