lkml.org 
[lkml]   [2023]   [Jul]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[patch v2 18/38] x86/cpu/topology: Cure the abuse of cpuinfo for persisting logical ids
Date
Per CPU cpuinfo is used to persist the logical package and die IDs. That's
really not the right place simply because cpuinfo is subject to be
reinitialized when a CPU goes through an offline/online cycle.

This works by chance today, but that's far from correct and neither obvious
nor documented.

Add a per cpu datastructure which persists those logical IDs, which allows
to cleanup the CPUID evaluation code.

This is a temporary workaround until the larger topology management is in
place, which makes all of this logical management mechanics obsolete.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/kernel/smpboot.c | 33 +++++++++++++++++++++++----------
1 file changed, 23 insertions(+), 10 deletions(-)

--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -124,7 +124,20 @@ struct mwait_cpu_dead {
*/
static DEFINE_PER_CPU_ALIGNED(struct mwait_cpu_dead, mwait_cpu_dead);

-/* Logical package management. We might want to allocate that dynamically */
+/* Logical package management. */
+struct logical_maps {
+ u32 phys_pkg_id;
+ u32 phys_die_id;
+ u32 logical_pkg_id;
+ u32 logical_die_id;
+};
+
+/* Temporary workaround until the full topology mechanics is in place */
+static DEFINE_PER_CPU_READ_MOSTLY(struct logical_maps, logical_maps) = {
+ .phys_pkg_id = U32_MAX,
+ .phys_die_id = U32_MAX,
+};
+
unsigned int __max_logical_packages __read_mostly;
EXPORT_SYMBOL(__max_logical_packages);
static unsigned int logical_packages __read_mostly;
@@ -345,10 +358,8 @@ int topology_phys_to_logical_pkg(unsigne
int cpu;

for_each_possible_cpu(cpu) {
- struct cpuinfo_x86 *c = &cpu_data(cpu);
-
- if (c->initialized && c->topo.pkg_id == phys_pkg)
- return c->topo.logical_pkg_id;
+ if (per_cpu(logical_maps.phys_pkg_id, cpu) == phys_pkg)
+ return per_cpu(logical_maps.logical_pkg_id, cpu);
}
return -1;
}
@@ -366,11 +377,9 @@ static int topology_phys_to_logical_die(
int cpu, proc_id = cpu_data(cur_cpu).topo.pkg_id;

for_each_possible_cpu(cpu) {
- struct cpuinfo_x86 *c = &cpu_data(cpu);
-
- if (c->initialized && c->topo.die_id == die_id &&
- c->topo.pkg_id == proc_id)
- return c->topo.logical_die_id;
+ if (per_cpu(logical_maps.phys_pkg_id, cpu) == proc_id &&
+ per_cpu(logical_maps.phys_die_id, cpu) == die_id)
+ return per_cpu(logical_maps.logical_die_id, cpu);
}
return -1;
}
@@ -395,6 +404,8 @@ int topology_update_package_map(unsigned
cpu, pkg, new);
}
found:
+ per_cpu(logical_maps.phys_pkg_id, cpu) = pkg;
+ per_cpu(logical_maps.logical_pkg_id, cpu) = new;
cpu_data(cpu).topo.logical_pkg_id = new;
return 0;
}
@@ -418,6 +429,8 @@ int topology_update_die_map(unsigned int
cpu, die, new);
}
found:
+ per_cpu(logical_maps.phys_die_id, cpu) = die;
+ per_cpu(logical_maps.logical_die_id, cpu) = new;
cpu_data(cpu).topo.logical_die_id = new;
return 0;
}
\
 
 \ /
  Last update: 2023-07-28 14:14    [W:0.226 / U:0.372 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site