4.19-stable review patch. If anyone has any objections, please let me know.
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From: Gregory CLEMENT gregory.clement@bootlin.com
[ Upstream commit a263e5f309f32301e1f3ad113293f4e68a82a646 ]
When the CM block migrated from CM2.5 to CM3.0, the address offset for the Global CSR Access Privilege register was modified. We saw this in the "MIPS64 I6500 Multiprocessing System Programmer's Guide," it is stated that "the Global CSR Access Privilege register is located at offset 0x0120" in section 5.4. It is at least the same for I6400.
This fix allows to use the VP cores in SMP mode if the reset values were modified by the bootloader.
Based on the work of Vladimir Kondratiev vladimir.kondratiev@mobileye.com and the feedback from Jiaxun Yang jiaxun.yang@flygoat.com.
Fixes: 197e89e0984a ("MIPS: mips-cm: Implement mips_cm_revision") Signed-off-by: Gregory CLEMENT gregory.clement@bootlin.com Reviewed-by: Jiaxun Yang jiaxun.yang@flygoat.com Signed-off-by: Thomas Bogendoerfer tsbogend@alpha.franken.de Signed-off-by: Sasha Levin sashal@kernel.org --- arch/mips/include/asm/mips-cm.h | 4 ++++ arch/mips/kernel/smp-cps.c | 5 ++++- 2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/arch/mips/include/asm/mips-cm.h b/arch/mips/include/asm/mips-cm.h index 890e51b159e06..11a3d5120e2b5 100644 --- a/arch/mips/include/asm/mips-cm.h +++ b/arch/mips/include/asm/mips-cm.h @@ -232,6 +232,10 @@ GCR_ACCESSOR_RO(32, 0x0d0, gic_status) GCR_ACCESSOR_RO(32, 0x0f0, cpc_status) #define CM_GCR_CPC_STATUS_EX BIT(0)
+/* GCR_ACCESS - Controls core/IOCU access to GCRs */ +GCR_ACCESSOR_RW(32, 0x120, access_cm3) +#define CM_GCR_ACCESS_ACCESSEN GENMASK(7, 0) + /* GCR_L2_CONFIG - Indicates L2 cache configuration when Config5.L2C=1 */ GCR_ACCESSOR_RW(32, 0x130, l2_config) #define CM_GCR_L2_CONFIG_BYPASS BIT(20) diff --git a/arch/mips/kernel/smp-cps.c b/arch/mips/kernel/smp-cps.c index 03f1026ad1484..1861b20e978d0 100644 --- a/arch/mips/kernel/smp-cps.c +++ b/arch/mips/kernel/smp-cps.c @@ -233,7 +233,10 @@ static void boot_core(unsigned int core, unsigned int vpe_id) write_gcr_co_reset_ext_base(CM_GCR_Cx_RESET_EXT_BASE_UEB);
/* Ensure the core can access the GCRs */ - set_gcr_access(1 << core); + if (mips_cm_revision() < CM_REV_CM3) + set_gcr_access(1 << core); + else + set_gcr_access_cm3(1 << core);
if (mips_cpc_present()) { /* Reset the core */