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Merge tag 'arm64-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64

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Pull arm64 update from Catalin Marinas:
 "Main features:

   - Versatile Express SoC (model) support - DT files and Kconfig
     entries (there are no arch/arm64/mach-* directories).  The bulk of
     the code has already been moved to drivers/ as part of the ARM SoC
     clean-up.

   - Basic multi-cluster support (CPU logical map initialised from the
     DT)

   - Simple earlyprintk support for UART 8250/16550 and FastModel
     console output

   - Optimised kernel library bitops and string functions.

   - Automatic initialisation of the irqchip and clocks via DT"

* tag 'arm64-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64: (26 commits)
  arm64: Use acquire/release semantics instead of explicit DMB
  arm64: klib: bitops: fix unpredictable stxr usage
  arm64: vexpress: Enable ARMv8 RTSM model (SoC) support
  arm64: vexpress: Add dts files for the ARMv8 RTSM models
  arm64: Survive invalid cpu enable-methods
  arm64: mm: Correct show_pte behaviour
  arm64: Fix compat types affecting struct compat_stat
  arm64: Execute DSB during thread switching for TLB/cache maintenance
  arm64: compiling issue, need add include/asm/vga.h file
  arm64: smp: honour #address-size when parsing CPU reg property
  arm64: Define cmpxchg64 and cmpxchg64_local for outside use
  arm64: Define readq and writeq for driver module using
  arm64: Fix task tracing
  arm64: add explicit symbols to ESR_EL1 decoding
  arm64: Use irqchip_init() for interrupt controller initialisation
  arm64: psci: Use the MPIDR values from cpu_logical_map for cpu ids.
  arm64: klib: Optimised atomic bitops
  arm64: klib: Optimised string functions
  arm64: klib: Optimised memory functions
  arm64: head: match all affinity levels in the pen of the secondaries
  ...
This commit is contained in:
Linus Torvalds
2013-04-30 10:10:48 -07:00
parent 87c1f0f8c9 16c85a1fd7
commit c9ef713993
38 changed files with 1410 additions and 90 deletions
Download Patch File Download Diff File Expand all files Collapse all files

113
arch/arm64/kernel/smp.c
View File

@@ -43,6 +43,7 @@
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/processor.h>
#include <asm/smp_plat.h>
#include <asm/sections.h>
#include <asm/tlbflush.h>
#include <asm/ptrace.h>
@@ -53,7 +54,7 @@
* where to place its SVC stack
*/
struct secondary_data secondary_data;
volatile unsigned long secondary_holding_pen_release = -1;
volatile unsigned long secondary_holding_pen_release = INVALID_HWID;
enum ipi_msg_type {
IPI_RESCHEDULE,
@@ -70,7 +71,7 @@ static DEFINE_RAW_SPINLOCK(boot_lock);
* in coherency or not. This is necessary for the hotplug code to work
* reliably.
*/
static void __cpuinit write_pen_release(int val)
static void __cpuinit write_pen_release(u64 val)
{
void *start = (void *)&secondary_holding_pen_release;
unsigned long size = sizeof(secondary_holding_pen_release);
@@ -96,7 +97,7 @@ static int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
/*
* Update the pen release flag.
*/
write_pen_release(cpu);
write_pen_release(cpu_logical_map(cpu));
/*
* Send an event, causing the secondaries to read pen_release.
@@ -105,7 +106,7 @@ static int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
timeout = jiffies + (1 * HZ);
while (time_before(jiffies, timeout)) {
if (secondary_holding_pen_release == -1UL)
if (secondary_holding_pen_release == INVALID_HWID)
break;
udelay(10);
}
@@ -116,7 +117,7 @@ static int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
*/
raw_spin_unlock(&boot_lock);
return secondary_holding_pen_release != -1 ? -ENOSYS : 0;
return secondary_holding_pen_release != INVALID_HWID ? -ENOSYS : 0;
}
static DECLARE_COMPLETION(cpu_running);
@@ -190,7 +191,7 @@ asmlinkage void __cpuinit secondary_start_kernel(void)
* Let the primary processor know we're out of the
* pen, then head off into the C entry point
*/
write_pen_release(-1);
write_pen_release(INVALID_HWID);
/*
* Synchronise with the boot thread.
@@ -244,11 +245,11 @@ static const struct smp_enable_ops *smp_enable_ops[NR_CPUS];
static const struct smp_enable_ops * __init smp_get_enable_ops(const char *name)
{
const struct smp_enable_ops *ops = enable_ops[0];
const struct smp_enable_ops **ops = enable_ops;
while (ops) {
if (!strcmp(name, ops->name))
return ops;
while (*ops) {
if (!strcmp(name, (*ops)->name))
return *ops;
ops++;
}
@@ -257,15 +258,80 @@ static const struct smp_enable_ops * __init smp_get_enable_ops(const char *name)
}
/*
* Enumerate the possible CPU set from the device tree.
* Enumerate the possible CPU set from the device tree and build the
* cpu logical map array containing MPIDR values related to logical
* cpus. Assumes that cpu_logical_map(0) has already been initialized.
*/
void __init smp_init_cpus(void)
{
const char *enable_method;
struct device_node *dn = NULL;
int cpu = 0;
int i, cpu = 1;
bool bootcpu_valid = false;
while ((dn = of_find_node_by_type(dn, "cpu"))) {
const u32 *cell;
u64 hwid;
/*
* A cpu node with missing "reg" property is
* considered invalid to build a cpu_logical_map
* entry.
*/
cell = of_get_property(dn, "reg", NULL);
if (!cell) {
pr_err("%s: missing reg property\n", dn->full_name);
goto next;
}
hwid = of_read_number(cell, of_n_addr_cells(dn));
/*
* Non affinity bits must be set to 0 in the DT
*/
if (hwid & ~MPIDR_HWID_BITMASK) {
pr_err("%s: invalid reg property\n", dn->full_name);
goto next;
}
/*
* Duplicate MPIDRs are a recipe for disaster. Scan
* all initialized entries and check for
* duplicates. If any is found just ignore the cpu.
* cpu_logical_map was initialized to INVALID_HWID to
* avoid matching valid MPIDR values.
*/
for (i = 1; (i < cpu) && (i < NR_CPUS); i++) {
if (cpu_logical_map(i) == hwid) {
pr_err("%s: duplicate cpu reg properties in the DT\n",
dn->full_name);
goto next;
}
}
/*
* The numbering scheme requires that the boot CPU
* must be assigned logical id 0. Record it so that
* the logical map built from DT is validated and can
* be used.
*/
if (hwid == cpu_logical_map(0)) {
if (bootcpu_valid) {
pr_err("%s: duplicate boot cpu reg property in DT\n",
dn->full_name);
goto next;
}
bootcpu_valid = true;
/*
* cpu_logical_map has already been
* initialized and the boot cpu doesn't need
* the enable-method so continue without
* incrementing cpu.
*/
continue;
}
if (cpu >= NR_CPUS)
goto next;
@@ -274,22 +340,24 @@ void __init smp_init_cpus(void)
*/
enable_method = of_get_property(dn, "enable-method", NULL);
if (!enable_method) {
pr_err("CPU %d: missing enable-method property\n", cpu);
pr_err("%s: missing enable-method property\n",
dn->full_name);
goto next;
}
smp_enable_ops[cpu] = smp_get_enable_ops(enable_method);
if (!smp_enable_ops[cpu]) {
pr_err("CPU %d: invalid enable-method property: %s\n",
cpu, enable_method);
pr_err("%s: invalid enable-method property: %s\n",
dn->full_name, enable_method);
goto next;
}
if (smp_enable_ops[cpu]->init_cpu(dn, cpu))
goto next;
set_cpu_possible(cpu, true);
pr_debug("cpu logical map 0x%llx\n", hwid);
cpu_logical_map(cpu) = hwid;
next:
cpu++;
}
@@ -298,6 +366,19 @@ next:
if (cpu > NR_CPUS)
pr_warning("no. of cores (%d) greater than configured maximum of %d - clipping\n",
cpu, NR_CPUS);
if (!bootcpu_valid) {
pr_err("DT missing boot CPU MPIDR, not enabling secondaries\n");
return;
}
/*
* All the cpus that made it to the cpu_logical_map have been
* validated so set them as possible cpus.
*/
for (i = 0; i < NR_CPUS; i++)
if (cpu_logical_map(i) != INVALID_HWID)
set_cpu_possible(i, true);
}
void __init smp_prepare_cpus(unsigned int max_cpus)