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| author |   Nicholas Piggin <npiggin@gmail.com> | 2017-05-09 13:16:52 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2017-05-09 23:42:55 +1000 |
| commit | 5a61ef74f269f2573f48fa53607a8911216c3326 (patch) | |
| tree | 5282bc7ceb24c4864d1060bfe59688e72027b1cb /arch/powerpc/kernel/prom.c | |
| parent | powerpc: Don't print cpu_spec->cpu_name if it's NULL (diff) | |
| download | linux-dev-5a61ef74f269f2573f48fa53607a8911216c3326.tar.xz linux-dev-5a61ef74f269f2573f48fa53607a8911216c3326.zip | |
powerpc/64s: Support new device tree binding for discovering CPU features
The ibm,powerpc-cpu-features device tree binding describes CPU features with
ASCII names and extensible compatibility, privilege, and enablement metadata
that allows improved flexibility and compatibility with new hardware.
The interface is described in detail in ibm,powerpc-cpu-features.txt in this
patch.
Currently this code is not enabled by default, and there are no released
firmwares that provide the binding.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/prom.c')
| -rw-r--r-- | arch/powerpc/kernel/prom.c | 29 |
1 files changed, 20 insertions, 9 deletions
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index d2f0afeae5a0..40c4887c27b6 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -57,6 +57,7 @@ #include <asm/fadump.h> #include <asm/epapr_hcalls.h> #include <asm/firmware.h> +#include <asm/dt_cpu_ftrs.h> #include <mm/mmu_decl.h> @@ -375,23 +376,31 @@ static int __init early_init_dt_scan_cpus(unsigned long node, * A POWER6 partition in "POWER6 architected" mode * uses the 0x0f000002 PVR value; in POWER5+ mode * it uses 0x0f000001. + * + * If we're using device tree CPU feature discovery then we don't + * support the cpu-version property, and it's the responsibility of the + * firmware/hypervisor to provide the correct feature set for the + * architecture level via the ibm,powerpc-cpu-features binding. */ - prop = of_get_flat_dt_prop(node, "cpu-version", NULL); - if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000) - identify_cpu(0, be32_to_cpup(prop)); + if (!dt_cpu_ftrs_in_use()) { + prop = of_get_flat_dt_prop(node, "cpu-version", NULL); + if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000) + identify_cpu(0, be32_to_cpup(prop)); - identical_pvr_fixup(node); + check_cpu_feature_properties(node); + check_cpu_pa_features(node); + } - check_cpu_feature_properties(node); - check_cpu_pa_features(node); + identical_pvr_fixup(node); init_mmu_slb_size(node); #ifdef CONFIG_PPC64 - if (nthreads > 1) - cur_cpu_spec->cpu_features |= CPU_FTR_SMT; - else + if (nthreads == 1) cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT; + else if (!dt_cpu_ftrs_in_use()) + cur_cpu_spec->cpu_features |= CPU_FTR_SMT; #endif + return 0; } @@ -721,6 +730,8 @@ void __init early_init_devtree(void *params) DBG("Scanning CPUs ...\n"); + dt_cpu_ftrs_scan(); + /* Retrieve CPU related informations from the flat tree * (altivec support, boot CPU ID, ...) */ |