lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[POWERPC] Use SLB size from the device tree

Browse Source 
Currently we hardwire the number of SLBs to 64, but PAPR says we
should use the ibm,slb-size property to obtain the number of SLB
entries.  This uses this property instead of assuming 64.  If no
property is found, we assume 64 entries as before.

This soft patches the SLB handler, so it shouldn't change performance
at all.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Michael Neuling
2007-12-06 17:24:48 +11:00
committed by Paul Mackerras
parent 44ef339073
commit 584f8b71a2
8 changed files with 26 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
arch/powerpc/kernel/prom.c
View File

@ -583,6 +583,20 @@ static void __init check_cpu_pa_features(unsigned long node)
ibm_pa_features, ARRAY_SIZE(ibm_pa_features));
}
#ifdef CONFIG_PPC64
static void __init check_cpu_slb_size(unsigned long node)
{
u32 *slb_size_ptr;
slb_size_ptr = of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
if (slb_size_ptr != NULL) {
mmu_slb_size = *slb_size_ptr;
}
}
#else
#define check_cpu_slb_size(node) do { } while(0)
#endif
static struct feature_property {
const char *name;
u32 min_value;
@ -713,6 +727,7 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
check_cpu_feature_properties(node);
check_cpu_pa_features(node);
check_cpu_slb_size(node);
#ifdef CONFIG_PPC_PSERIES
if (nthreads > 1)