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-rw-r--r--arch/xtensa/kernel/.gitignore1
-rw-r--r--arch/xtensa/kernel/Makefile1
-rw-r--r--arch/xtensa/kernel/entry.S16
-rw-r--r--arch/xtensa/kernel/head.S9
-rw-r--r--arch/xtensa/kernel/mcount.S50
-rw-r--r--arch/xtensa/kernel/pci.c10
-rw-r--r--arch/xtensa/kernel/platform.c3
-rw-r--r--arch/xtensa/kernel/setup.c8
-rw-r--r--arch/xtensa/kernel/time.c123
-rw-r--r--arch/xtensa/kernel/xtensa_ksyms.c4
10 files changed, 177 insertions, 48 deletions
diff --git a/arch/xtensa/kernel/.gitignore b/arch/xtensa/kernel/.gitignore
new file mode 100644
index 000000000000..c5f676c3c224
--- /dev/null
+++ b/arch/xtensa/kernel/.gitignore
@@ -0,0 +1 @@
+vmlinux.lds
diff --git a/arch/xtensa/kernel/Makefile b/arch/xtensa/kernel/Makefile
index 1e7fc87a94bb..f90265ec1ccc 100644
--- a/arch/xtensa/kernel/Makefile
+++ b/arch/xtensa/kernel/Makefile
@@ -11,6 +11,7 @@ obj-y := align.o coprocessor.o entry.o irq.o pci-dma.o platform.o process.o \
obj-$(CONFIG_KGDB) += xtensa-stub.o
obj-$(CONFIG_PCI) += pci.o
obj-$(CONFIG_MODULES) += xtensa_ksyms.o module.o
+obj-$(CONFIG_FUNCTION_TRACER) += mcount.o
AFLAGS_head.o += -mtext-section-literals
diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S
index 5082507d5631..9298742f0fd0 100644
--- a/arch/xtensa/kernel/entry.S
+++ b/arch/xtensa/kernel/entry.S
@@ -458,7 +458,7 @@ common_exception_return:
_bbsi.l a4, TIF_NEED_RESCHED, 3f
_bbsi.l a4, TIF_NOTIFY_RESUME, 2f
- _bbci.l a4, TIF_SIGPENDING, 4f
+ _bbci.l a4, TIF_SIGPENDING, 5f
2: l32i a4, a1, PT_DEPC
bgeui a4, VALID_DOUBLE_EXCEPTION_ADDRESS, 4f
@@ -476,6 +476,13 @@ common_exception_return:
callx4 a4
j 1b
+5:
+#ifdef CONFIG_DEBUG_TLB_SANITY
+ l32i a4, a1, PT_DEPC
+ bgeui a4, VALID_DOUBLE_EXCEPTION_ADDRESS, 4f
+ movi a4, check_tlb_sanity
+ callx4 a4
+#endif
4: /* Restore optional registers. */
load_xtregs_opt a1 a2 a4 a5 a6 a7 PT_XTREGS_OPT
@@ -1792,10 +1799,15 @@ ENTRY(fast_store_prohibited)
l32i a0, a0, 0
beqz a0, 2f
- /* Note that we assume _PAGE_WRITABLE_BIT is only set if pte is valid.*/
+ /*
+ * Note that we test _PAGE_WRITABLE_BIT only if PTE is present
+ * and is not PAGE_NONE. See pgtable.h for possible PTE layouts.
+ */
_PTE_OFFSET(a0, a1, a4)
l32i a4, a0, 0 # read pteval
+ movi a1, _PAGE_CA_INVALID
+ ball a4, a1, 2f
bbci.l a4, _PAGE_WRITABLE_BIT, 2f
movi a1, _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_HW_WRITE
diff --git a/arch/xtensa/kernel/head.S b/arch/xtensa/kernel/head.S
index ef12c0e6fa25..7d740ebbe198 100644
--- a/arch/xtensa/kernel/head.S
+++ b/arch/xtensa/kernel/head.S
@@ -68,6 +68,15 @@ _SetupMMU:
#ifdef CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
initialize_mmu
+#if defined(CONFIG_MMU) && XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY
+ rsr a2, excsave1
+ movi a3, 0x08000000
+ bgeu a2, a3, 1f
+ movi a3, 0xd0000000
+ add a2, a2, a3
+ wsr a2, excsave1
+1:
+#endif
#endif
.end no-absolute-literals
diff --git a/arch/xtensa/kernel/mcount.S b/arch/xtensa/kernel/mcount.S
new file mode 100644
index 000000000000..0eeda2e4a25e
--- /dev/null
+++ b/arch/xtensa/kernel/mcount.S
@@ -0,0 +1,50 @@
+/*
+ * arch/xtensa/kernel/mcount.S
+ *
+ * Xtensa specific mcount support
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2013 Tensilica Inc.
+ */
+
+#include <linux/linkage.h>
+#include <asm/ftrace.h>
+
+/*
+ * Entry condition:
+ *
+ * a2: a0 of the caller
+ */
+
+ENTRY(_mcount)
+
+ entry a1, 16
+
+ movi a4, ftrace_trace_function
+ l32i a4, a4, 0
+ movi a3, ftrace_stub
+ bne a3, a4, 1f
+ retw
+
+1: xor a7, a2, a1
+ movi a3, 0x3fffffff
+ and a7, a7, a3
+ xor a7, a7, a1
+
+ xor a6, a0, a1
+ and a6, a6, a3
+ xor a6, a6, a1
+ addi a6, a6, -MCOUNT_INSN_SIZE
+ callx4 a4
+
+ retw
+
+ENDPROC(_mcount)
+
+ENTRY(ftrace_stub)
+ entry a1, 16
+ retw
+ENDPROC(ftrace_stub)
diff --git a/arch/xtensa/kernel/pci.c b/arch/xtensa/kernel/pci.c
index 126c18839409..5b3403388d7f 100644
--- a/arch/xtensa/kernel/pci.c
+++ b/arch/xtensa/kernel/pci.c
@@ -77,9 +77,9 @@ pcibios_align_resource(void *data, const struct resource *res,
if (res->flags & IORESOURCE_IO) {
if (size > 0x100) {
- printk(KERN_ERR "PCI: I/O Region %s/%d too large"
- " (%ld bytes)\n", pci_name(dev),
- dev->resource - res, size);
+ pr_err("PCI: I/O Region %s/%d too large (%u bytes)\n",
+ pci_name(dev), dev->resource - res,
+ size);
}
if (start & 0x300)
@@ -174,7 +174,7 @@ static int __init pcibios_init(void)
struct pci_controller *pci_ctrl;
struct list_head resources;
struct pci_bus *bus;
- int next_busno = 0, i;
+ int next_busno = 0;
printk("PCI: Probing PCI hardware\n");
@@ -197,7 +197,7 @@ static int __init pcibios_init(void)
subsys_initcall(pcibios_init);
-void __init pcibios_fixup_bus(struct pci_bus *bus)
+void pcibios_fixup_bus(struct pci_bus *bus)
{
if (bus->parent) {
/* This is a subordinate bridge */
diff --git a/arch/xtensa/kernel/platform.c b/arch/xtensa/kernel/platform.c
index 2bd6c351f37c..1cf008284dd2 100644
--- a/arch/xtensa/kernel/platform.c
+++ b/arch/xtensa/kernel/platform.c
@@ -29,7 +29,6 @@
*/
_F(void, setup, (char** cmd), { });
-_F(void, init_irq, (void), { });
_F(void, restart, (void), { while(1); });
_F(void, halt, (void), { while(1); });
_F(void, power_off, (void), { while(1); });
@@ -42,6 +41,6 @@ _F(void, pcibios_init, (void), { });
_F(void, calibrate_ccount, (void),
{
pr_err("ERROR: Cannot calibrate cpu frequency! Assuming 10MHz.\n");
- ccount_per_jiffy = 10 * (1000000UL/HZ);
+ ccount_freq = 10 * 1000000UL;
});
#endif
diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c
index 6dd25ecde3f5..42a8bba0b0ea 100644
--- a/arch/xtensa/kernel/setup.c
+++ b/arch/xtensa/kernel/setup.c
@@ -152,8 +152,8 @@ static int __init parse_tag_initrd(const bp_tag_t* tag)
{
meminfo_t* mi;
mi = (meminfo_t*)(tag->data);
- initrd_start = (void*)(mi->start);
- initrd_end = (void*)(mi->end);
+ initrd_start = __va(mi->start);
+ initrd_end = __va(mi->end);
return 0;
}
@@ -164,7 +164,7 @@ __tagtable(BP_TAG_INITRD, parse_tag_initrd);
static int __init parse_tag_fdt(const bp_tag_t *tag)
{
- dtb_start = (void *)(tag->data[0]);
+ dtb_start = __va(tag->data[0]);
return 0;
}
@@ -256,7 +256,7 @@ void __init early_init_devtree(void *params)
static void __init copy_devtree(void)
{
void *alloc = early_init_dt_alloc_memory_arch(
- be32_to_cpu(initial_boot_params->totalsize), 0);
+ be32_to_cpu(initial_boot_params->totalsize), 8);
if (alloc) {
memcpy(alloc, initial_boot_params,
be32_to_cpu(initial_boot_params->totalsize));
diff --git a/arch/xtensa/kernel/time.c b/arch/xtensa/kernel/time.c
index ffb474104311..bdbb17312526 100644
--- a/arch/xtensa/kernel/time.c
+++ b/arch/xtensa/kernel/time.c
@@ -16,6 +16,7 @@
#include <linux/sched.h>
#include <linux/time.h>
#include <linux/clocksource.h>
+#include <linux/clockchips.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/init.h>
@@ -23,13 +24,13 @@
#include <linux/profile.h>
#include <linux/delay.h>
#include <linux/irqdomain.h>
+#include <linux/sched_clock.h>
#include <asm/timex.h>
#include <asm/platform.h>
#ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
-unsigned long ccount_per_jiffy; /* per 1/HZ */
-unsigned long nsec_per_ccount; /* nsec per ccount increment */
+unsigned long ccount_freq; /* ccount Hz */
#endif
static cycle_t ccount_read(struct clocksource *cs)
@@ -37,6 +38,11 @@ static cycle_t ccount_read(struct clocksource *cs)
return (cycle_t)get_ccount();
}
+static u32 notrace ccount_sched_clock_read(void)
+{
+ return get_ccount();
+}
+
static struct clocksource ccount_clocksource = {
.name = "ccount",
.rating = 200,
@@ -44,29 +50,98 @@ static struct clocksource ccount_clocksource = {
.mask = CLOCKSOURCE_MASK(32),
};
+static int ccount_timer_set_next_event(unsigned long delta,
+ struct clock_event_device *dev);
+static void ccount_timer_set_mode(enum clock_event_mode mode,
+ struct clock_event_device *evt);
+static struct ccount_timer_t {
+ struct clock_event_device evt;
+ int irq_enabled;
+} ccount_timer = {
+ .evt = {
+ .name = "ccount_clockevent",
+ .features = CLOCK_EVT_FEAT_ONESHOT,
+ .rating = 300,
+ .set_next_event = ccount_timer_set_next_event,
+ .set_mode = ccount_timer_set_mode,
+ },
+};
+
+static int ccount_timer_set_next_event(unsigned long delta,
+ struct clock_event_device *dev)
+{
+ unsigned long flags, next;
+ int ret = 0;
+
+ local_irq_save(flags);
+ next = get_ccount() + delta;
+ set_linux_timer(next);
+ if (next - get_ccount() > delta)
+ ret = -ETIME;
+ local_irq_restore(flags);
+
+ return ret;
+}
+
+static void ccount_timer_set_mode(enum clock_event_mode mode,
+ struct clock_event_device *evt)
+{
+ struct ccount_timer_t *timer =
+ container_of(evt, struct ccount_timer_t, evt);
+
+ /*
+ * There is no way to disable the timer interrupt at the device level,
+ * only at the intenable register itself. Since enable_irq/disable_irq
+ * calls are nested, we need to make sure that these calls are
+ * balanced.
+ */
+ switch (mode) {
+ case CLOCK_EVT_MODE_SHUTDOWN:
+ case CLOCK_EVT_MODE_UNUSED:
+ if (timer->irq_enabled) {
+ disable_irq(evt->irq);
+ timer->irq_enabled = 0;
+ }
+ break;
+ case CLOCK_EVT_MODE_RESUME:
+ case CLOCK_EVT_MODE_ONESHOT:
+ if (!timer->irq_enabled) {
+ enable_irq(evt->irq);
+ timer->irq_enabled = 1;
+ }
+ default:
+ break;
+ }
+}
+
static irqreturn_t timer_interrupt(int irq, void *dev_id);
static struct irqaction timer_irqaction = {
.handler = timer_interrupt,
- .flags = IRQF_DISABLED,
+ .flags = IRQF_TIMER,
.name = "timer",
+ .dev_id = &ccount_timer,
};
void __init time_init(void)
{
- unsigned int irq;
#ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
printk("Calibrating CPU frequency ");
platform_calibrate_ccount();
- printk("%d.%02d MHz\n", (int)ccount_per_jiffy/(1000000/HZ),
- (int)(ccount_per_jiffy/(10000/HZ))%100);
+ printk("%d.%02d MHz\n", (int)ccount_freq/1000000,
+ (int)(ccount_freq/10000)%100);
#endif
clocksource_register_hz(&ccount_clocksource, CCOUNT_PER_JIFFY * HZ);
- /* Initialize the linux timer interrupt. */
+ ccount_timer.evt.cpumask = cpumask_of(0);
+ ccount_timer.evt.irq = irq_create_mapping(NULL, LINUX_TIMER_INT);
+ if (WARN(!ccount_timer.evt.irq, "error: can't map timer irq"))
+ return;
+ clockevents_config_and_register(&ccount_timer.evt, ccount_freq, 0xf,
+ 0xffffffff);
+ setup_irq(ccount_timer.evt.irq, &timer_irqaction);
+ ccount_timer.irq_enabled = 1;
- irq = irq_create_mapping(NULL, LINUX_TIMER_INT);
- setup_irq(irq, &timer_irqaction);
- set_linux_timer(get_ccount() + CCOUNT_PER_JIFFY);
+ setup_sched_clock(ccount_sched_clock_read, 32, ccount_freq);
}
/*
@@ -75,36 +150,14 @@ void __init time_init(void)
irqreturn_t timer_interrupt (int irq, void *dev_id)
{
+ struct ccount_timer_t *timer = dev_id;
+ struct clock_event_device *evt = &timer->evt;
- unsigned long next;
-
- next = get_linux_timer();
-
-again:
- while ((signed long)(get_ccount() - next) > 0) {
-
- profile_tick(CPU_PROFILING);
-#ifndef CONFIG_SMP
- update_process_times(user_mode(get_irq_regs()));
-#endif
-
- xtime_update(1); /* Linux handler in kernel/time/timekeeping */
-
- /* Note that writing CCOMPARE clears the interrupt. */
-
- next += CCOUNT_PER_JIFFY;
- set_linux_timer(next);
- }
+ evt->event_handler(evt);
/* Allow platform to do something useful (Wdog). */
-
platform_heartbeat();
- /* Make sure we didn't miss any tick... */
-
- if ((signed long)(get_ccount() - next) > 0)
- goto again;
-
return IRQ_HANDLED;
}
diff --git a/arch/xtensa/kernel/xtensa_ksyms.c b/arch/xtensa/kernel/xtensa_ksyms.c
index 42c53c87c204..d8507f812f46 100644
--- a/arch/xtensa/kernel/xtensa_ksyms.c
+++ b/arch/xtensa/kernel/xtensa_ksyms.c
@@ -124,3 +124,7 @@ extern long common_exception_return;
extern long _spill_registers;
EXPORT_SYMBOL(common_exception_return);
EXPORT_SYMBOL(_spill_registers);
+
+#ifdef CONFIG_FUNCTION_TRACER
+EXPORT_SYMBOL(_mcount);
+#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-10-16 06:11:53 +0000