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of: Make cpu node handling more portable.

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Use for_each_node_by_type() to iterate all cpu nodes in the
system.

Provide and overridable function arch_find_n_match_cpu_physical_id,
which sees if the given device node matches 'cpu' and if so sets
'*thread' when non-NULL to the cpu thread number within the core.

The default implementation behaves the same as the existing code.

Add a sparc64 implementation.

Signed-off-by: David S. Miller <davem@davemloft.net>
Tested-by: Sudeep KarkadaNagesha <Sudeep.KarkadaNagesha@arm.com>
Signed-off-by: Grant Likely <grant.likely@linaro.org>
This commit is contained in:
David Miller
2013-10-03 17:24:51 -04:00
committed by Grant Likely
parent 444c91e572
commit d1cb9d1af0
3 changed files with 84 additions and 17 deletions
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45
drivers/of/base.c
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@@ -280,6 +280,31 @@ static bool __of_find_n_match_cpu_property(struct device_node *cpun,
return false;
}
/*
* arch_find_n_match_cpu_physical_id - See if the given device node is
* for the cpu corresponding to logical cpu 'cpu'. Return true if so,
* else false. If 'thread' is non-NULL, the local thread number within the
* core is returned in it.
*/
bool __weak arch_find_n_match_cpu_physical_id(struct device_node *cpun,
int cpu, unsigned int *thread)
{
/* Check for non-standard "ibm,ppc-interrupt-server#s" property
* for thread ids on PowerPC. If it doesn't exist fallback to
* standard "reg" property.
*/
if (IS_ENABLED(CONFIG_PPC) &&
__of_find_n_match_cpu_property(cpun,
"ibm,ppc-interrupt-server#s",
cpu, thread))
return true;
if (__of_find_n_match_cpu_property(cpun, "reg", cpu, thread))
return true;
return false;
}
/**
* of_get_cpu_node - Get device node associated with the given logical CPU
*
@@ -300,24 +325,10 @@ static bool __of_find_n_match_cpu_property(struct device_node *cpun,
*/
struct device_node *of_get_cpu_node(int cpu, unsigned int *thread)
{
struct device_node *cpun, *cpus;
struct device_node *cpun;
cpus = of_find_node_by_path("/cpus");
if (!cpus)
return NULL;
for_each_child_of_node(cpus, cpun) {
if (of_node_cmp(cpun->type, "cpu"))
continue;
/* Check for non-standard "ibm,ppc-interrupt-server#s" property
* for thread ids on PowerPC. If it doesn't exist fallback to
* standard "reg" property.
*/
if (IS_ENABLED(CONFIG_PPC) &&
__of_find_n_match_cpu_property(cpun,
"ibm,ppc-interrupt-server#s", cpu, thread))
return cpun;
if (__of_find_n_match_cpu_property(cpun, "reg", cpu, thread))
for_each_node_by_type(cpun, "cpu") {
if (arch_find_n_match_cpu_physical_id(cpun, cpu, thread))
return cpun;
}
return NULL;