Re: [RFT/RFC PATCH v3 4/5] arm: Use common cpu_topology
From: Atish Patra
Date: Tue Apr 16 2019 - 15:04:04 EST
On 4/16/19 6:09 AM, Sudeep Holla wrote:
On Mon, Apr 15, 2019 at 02:16:43PM -0700, Atish Patra wrote:
On 4/15/19 8:31 AM, Sudeep Holla wrote:
On Wed, Mar 20, 2019 at 04:48:05PM -0700, Atish Patra wrote:
Currently, ARM32 and ARM64 uses different data structures to
represent their cpu toplogies. Since, we are moving the ARM64
topology to common code to be used by other architectures, we
can reuse that for ARM32 as well.
Signed-off-by: Atish Patra <atish.patra@xxxxxxx>
---
arch/arm/include/asm/topology.h | 22 +---------------------
arch/arm/kernel/topology.c | 10 +++++-----
include/linux/arch_topology.h | 10 +++++++++-
3 files changed, 15 insertions(+), 27 deletions(-)
[...]
diff --git a/include/linux/arch_topology.h b/include/linux/arch_topology.h
index d4e76e0a..7c850611 100644
--- a/include/linux/arch_topology.h
+++ b/include/linux/arch_topology.h
@@ -36,17 +36,25 @@ unsigned long topology_get_freq_scale(int cpu)
struct cpu_topology {
int thread_id;
int core_id;
+#ifdef CONFIG_ARM_CPU_TOPOLOGY
+ int socket_id;
Sorry, but I can't find any reason why we need to do this ifdef dance
here, especially for socket_id vs package_id ?
I was not sure if we can rename socket_id to package_id from a semantic
point of view. If you are okay with it, I will change it to package_id and
send a v4.
Thanks, all make sure to cc linux-arm-kernel@xxxxxxxxxxxxxxxxxxx,
just noticed that's missing and you are asking for testing on ARM
platforms :)
My bad!! I didn't realize that linux-arm-kernel is not included. Thanks
for pointing that out.
Other's I can understand
as there are new, but I am sure we can find a way and get away with
#ifdefery here completely.
That would be good. Any suggestions on how to do that?
Do you see any issues having extra structure members for ARM ?
Something like below seem to compile + boot fine on my 32-bit TC2 with
proper topology info on top of your series. Of course, more testing is
better, but I don't see any issue keeping llc_{id,sibling} around for
ARM eliminating the need for #ifdefs
I thought adding unused members for ARM32 might be unacceptable :).
I will update my v4 with this.
Regards,
Atish
Let me know if I am missing something.
-->8
diff --git i/arch/arm/kernel/topology.c w/arch/arm/kernel/topology.c
index 0ddb24c76c17..f2aa942e0cfa 100644
--- i/arch/arm/kernel/topology.c
+++ w/arch/arm/kernel/topology.c
@@ -206,7 +206,7 @@ void update_siblings_masks(unsigned int cpuid)
for_each_possible_cpu(cpu) {
cpu_topo = &cpu_topology[cpu];
- if (cpuid_topo->socket_id != cpu_topo->socket_id)
+ if (cpuid_topo->package_id != cpu_topo->package_id)
continue;
cpumask_set_cpu(cpuid, &cpu_topo->core_sibling);
@@ -250,12 +250,12 @@ void store_cpu_topology(unsigned int cpuid)
/* core performance interdependency */
cpuid_topo->thread_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
cpuid_topo->core_id = MPIDR_AFFINITY_LEVEL(mpidr, 1);
- cpuid_topo->socket_id = MPIDR_AFFINITY_LEVEL(mpidr, 2);
+ cpuid_topo->package_id = MPIDR_AFFINITY_LEVEL(mpidr, 2);
} else {
/* largely independent cores */
cpuid_topo->thread_id = -1;
cpuid_topo->core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
- cpuid_topo->socket_id = MPIDR_AFFINITY_LEVEL(mpidr, 1);
+ cpuid_topo->package_id = MPIDR_AFFINITY_LEVEL(mpidr, 1);
}
} else {
/*
@@ -265,7 +265,7 @@ void store_cpu_topology(unsigned int cpuid)
*/
cpuid_topo->thread_id = -1;
cpuid_topo->core_id = 0;
- cpuid_topo->socket_id = -1;
+ cpuid_topo->package_id = -1;
}
update_siblings_masks(cpuid);
@@ -275,7 +275,7 @@ void store_cpu_topology(unsigned int cpuid)
pr_info("CPU%u: thread %d, cpu %d, socket %d, mpidr %x\n",
cpuid, cpu_topology[cpuid].thread_id,
cpu_topology[cpuid].core_id,
- cpu_topology[cpuid].socket_id, mpidr);
+ cpu_topology[cpuid].package_id, mpidr);
}
static inline int cpu_corepower_flags(void)
@@ -306,7 +306,7 @@ void __init init_cpu_topology(void)
cpu_topo->thread_id = -1;
cpu_topo->core_id = -1;
- cpu_topo->socket_id = -1;
+ cpu_topo->package_id = -1;
cpumask_clear(&cpu_topo->core_sibling);
cpumask_clear(&cpu_topo->thread_sibling);
}
diff --git i/include/linux/arch_topology.h w/include/linux/arch_topology.h
index 7c850611986d..8e82389c2bed 100644
--- i/include/linux/arch_topology.h
+++ w/include/linux/arch_topology.h
@@ -36,13 +36,9 @@ unsigned long topology_get_freq_scale(int cpu)
struct cpu_topology {
int thread_id;
int core_id;
-#ifdef CONFIG_ARM_CPU_TOPOLOGY
- int socket_id;
-#else
int package_id;
int llc_id;
cpumask_t llc_sibling;
-#endif
cpumask_t thread_sibling;
cpumask_t core_sibling;
};
@@ -50,11 +46,7 @@ struct cpu_topology {
#ifdef CONFIG_GENERIC_ARCH_TOPOLOGY
extern struct cpu_topology cpu_topology[NR_CPUS];
-#ifdef CONFIG_ARM_CPU_TOPOLOGY
-#define topology_physical_package_id(cpu) (cpu_topology[cpu].socket_id)
-#else
#define topology_physical_package_id(cpu) (cpu_topology[cpu].package_id)
-#endif
#define topology_core_id(cpu) (cpu_topology[cpu].core_id)
#define topology_core_cpumask(cpu) (&cpu_topology[cpu].core_sibling)
#define topology_sibling_cpumask(cpu) (&cpu_topology[cpu].thread_sibling)