5.15-stable patches

added patches:
	arm64-topology-move-store_cpu_topology-to-shared-code.patch

diff --git a/queue-5.15/arm64-topology-move-store_cpu_topology-to-shared-code.patch b/queue-5.15/arm64-topology-move-store_cpu_topology-to-shared-code.patch
new file mode 100644 (file)
index 0000000..fe01d07
--- /dev/null
+++ b/queue-5.15/arm64-topology-move-store_cpu_topology-to-shared-code.patch
@@ -0,0 +1,106 @@
+From 456797da792fa7cbf6698febf275fe9b36691f78 Mon Sep 17 00:00:00 2001
+From: Conor Dooley <conor.dooley@microchip.com>
+Date: Fri, 15 Jul 2022 18:51:55 +0100
+Subject: arm64: topology: move store_cpu_topology() to shared code
+
+From: Conor Dooley <conor.dooley@microchip.com>
+
+commit 456797da792fa7cbf6698febf275fe9b36691f78 upstream.
+
+arm64's method of defining a default cpu topology requires only minimal
+changes to apply to RISC-V also. The current arm64 implementation exits
+early in a uniprocessor configuration by reading MPIDR & claiming that
+uniprocessor can rely on the default values.
+
+This is appears to be a hangover from prior to '3102bc0e6ac7 ("arm64:
+topology: Stop using MPIDR for topology information")', because the
+current code just assigns default values for multiprocessor systems.
+
+With the MPIDR references removed, store_cpu_topolgy() can be moved to
+the common arch_topology code.
+
+Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
+Acked-by: Catalin Marinas <catalin.marinas@arm.com>
+Reviewed-by: Atish Patra <atishp@rivosinc.com>
+Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ arch/arm64/kernel/topology.c |   40 ----------------------------------------
+ drivers/base/arch_topology.c |   19 +++++++++++++++++++
+ 2 files changed, 19 insertions(+), 40 deletions(-)
+
+--- a/arch/arm64/kernel/topology.c
++++ b/arch/arm64/kernel/topology.c
+@@ -22,46 +22,6 @@
+ #include <asm/cputype.h>
+ #include <asm/topology.h>
+ 
+-void store_cpu_topology(unsigned int cpuid)
+-{
+-      struct cpu_topology *cpuid_topo = &cpu_topology[cpuid];
+-      u64 mpidr;
+-
+-      if (cpuid_topo->package_id != -1)
+-              goto topology_populated;
+-
+-      mpidr = read_cpuid_mpidr();
+-
+-      /* Uniprocessor systems can rely on default topology values */
+-      if (mpidr & MPIDR_UP_BITMASK)
+-              return;
+-
+-      /*
+-       * This would be the place to create cpu topology based on MPIDR.
+-       *
+-       * However, it cannot be trusted to depict the actual topology; some
+-       * pieces of the architecture enforce an artificial cap on Aff0 values
+-       * (e.g. GICv3's ICC_SGI1R_EL1 limits it to 15), leading to an
+-       * artificial cycling of Aff1, Aff2 and Aff3 values. IOW, these end up
+-       * having absolutely no relationship to the actual underlying system
+-       * topology, and cannot be reasonably used as core / package ID.
+-       *
+-       * If the MT bit is set, Aff0 *could* be used to define a thread ID, but
+-       * we still wouldn't be able to obtain a sane core ID. This means we
+-       * need to entirely ignore MPIDR for any topology deduction.
+-       */
+-      cpuid_topo->thread_id  = -1;
+-      cpuid_topo->core_id    = cpuid;
+-      cpuid_topo->package_id = cpu_to_node(cpuid);
+-
+-      pr_debug("CPU%u: cluster %d core %d thread %d mpidr %#016llx\n",
+-               cpuid, cpuid_topo->package_id, cpuid_topo->core_id,
+-               cpuid_topo->thread_id, mpidr);
+-
+-topology_populated:
+-      update_siblings_masks(cpuid);
+-}
+-
+ #ifdef CONFIG_ACPI
+ static bool __init acpi_cpu_is_threaded(int cpu)
+ {
+--- a/drivers/base/arch_topology.c
++++ b/drivers/base/arch_topology.c
+@@ -690,4 +690,23 @@ void __init init_cpu_topology(void)
+       else if (of_have_populated_dt() && parse_dt_topology())
+               reset_cpu_topology();
+ }
++
++void store_cpu_topology(unsigned int cpuid)
++{
++      struct cpu_topology *cpuid_topo = &cpu_topology[cpuid];
++
++      if (cpuid_topo->package_id != -1)
++              goto topology_populated;
++
++      cpuid_topo->thread_id = -1;
++      cpuid_topo->core_id = cpuid;
++      cpuid_topo->package_id = cpu_to_node(cpuid);
++
++      pr_debug("CPU%u: package %d core %d thread %d\n",
++               cpuid, cpuid_topo->package_id, cpuid_topo->core_id,
++               cpuid_topo->thread_id);
++
++topology_populated:
++      update_siblings_masks(cpuid);
++}
+ #endif

diff --git a/queue-5.15/series b/queue-5.15/series
index 10b381b0e9bb87bc6c23b28ffea5125348d0d504..db58c7930f9c82cc087bc0f637b133156f311b29 100644 (file)
--- a/queue-5.15/series
+++ b/queue-5.15/series
@@ -35,6 +35,7 @@ asoc-wcd934x-fix-order-of-slimbus-unprepare-disable.patch
 hwmon-gsc-hwmon-call-of_node_get-before-of_find_xxx-api.patch
 net-thunderbolt-enable-dma-paths-only-after-rings-are-enabled.patch
 regulator-qcom_rpm-fix-circular-deferral-regression.patch
+arm64-topology-move-store_cpu_topology-to-shared-code.patch
 riscv-topology-fix-default-topology-reporting.patch
 risc-v-make-port-i-o-string-accessors-actually-work.patch
 parisc-fbdev-stifb-align-graphics-memory-size-to-4mb.patch