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authorVineet Gupta <vgupta@synopsys.com>2020-10-29 19:18:34 -0700
committerVineet Gupta <vgupta@synopsys.com>2020-11-02 11:45:09 -0800
commit3b57533b460c8dc22a432684b7e8d22571f34d2e (patch)
tree8c5930bea87d55b727f1ad906b2bbb9e54925d23 /arch/arc/plat-hsdk
parent328d2168ca524d501fc4b133d6be076142bd305c (diff)
downloadlinux-3b57533b460c8dc22a432684b7e8d22571f34d2e.tar.bz2
ARC: [plat-hsdk] Remap CCMs super early in asm boot trampoline
ARC HSDK platform stopped booting on released v5.10-rc1, getting stuck in startup of non master SMP cores. This was bisected to upstream commit 7fef431be9c9ac25 "(mm/page_alloc: place pages to tail in __free_pages_core())" That commit itself is harmless, it just exposed a subtle assumption in our platform code (hence CC'ing linux-mm just as FYI in case some other arches / platforms trip on it). The upstream commit is semantically disruptive as it reverses the order of page allocations (actually it can be good test for hardware verification to exercise different memory patterns altogether). For ARC HSDK platform that meant a remapped memory region (pertaining to unused Closely Coupled Memory) started getting used early for dynamice allocations, while not effectively remapped on all the cores, triggering memory error exception on those cores. The fix is to move the CCM remapping from early platform code to to early core boot code. And while it is undesirable to riddle common boot code with platform quirks, there is no other way to do this since the faltering code involves setting up stack itself so even function calls are not allowed at that point. If anyone is interested, all the gory details can be found at Link below. Link: https://github.com/foss-for-synopsys-dwc-arc-processors/linux/issues/32 Cc: David Hildenbrand <david@redhat.com> Cc: linux-mm@kvack.org Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/plat-hsdk')
-rw-r--r--arch/arc/plat-hsdk/platform.c17
1 files changed, 0 insertions, 17 deletions
diff --git a/arch/arc/plat-hsdk/platform.c b/arch/arc/plat-hsdk/platform.c
index 0b63fc095b99..b3ea1fa11f87 100644
--- a/arch/arc/plat-hsdk/platform.c
+++ b/arch/arc/plat-hsdk/platform.c
@@ -17,22 +17,6 @@ int arc_hsdk_axi_dmac_coherent __section(".data") = 0;
#define ARC_CCM_UNUSED_ADDR 0x60000000
-static void __init hsdk_init_per_cpu(unsigned int cpu)
-{
- /*
- * By default ICCM is mapped to 0x7z while this area is used for
- * kernel virtual mappings, so move it to currently unused area.
- */
- if (cpuinfo_arc700[cpu].iccm.sz)
- write_aux_reg(ARC_REG_AUX_ICCM, ARC_CCM_UNUSED_ADDR);
-
- /*
- * By default DCCM is mapped to 0x8z while this area is used by kernel,
- * so move it to currently unused area.
- */
- if (cpuinfo_arc700[cpu].dccm.sz)
- write_aux_reg(ARC_REG_AUX_DCCM, ARC_CCM_UNUSED_ADDR);
-}
#define ARC_PERIPHERAL_BASE 0xf0000000
#define CREG_BASE (ARC_PERIPHERAL_BASE + 0x1000)
@@ -339,5 +323,4 @@ static const char *hsdk_compat[] __initconst = {
MACHINE_START(SIMULATION, "hsdk")
.dt_compat = hsdk_compat,
.init_early = hsdk_init_early,
- .init_per_cpu = hsdk_init_per_cpu,
MACHINE_END