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-rw-r--r--arch/powerpc/kernel/prom_init.c29
1 files changed, 16 insertions, 13 deletions
diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index acf4b2e0530c..f9d6befb55a6 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -171,7 +171,7 @@ static unsigned long __initdata prom_tce_alloc_start;
static unsigned long __initdata prom_tce_alloc_end;
#endif
-static bool __initdata prom_radix_disable;
+static bool prom_radix_disable __initdata = !IS_ENABLED(CONFIG_PPC_RADIX_MMU_DEFAULT);
struct platform_support {
bool hash_mmu;
@@ -641,9 +641,19 @@ static void __init early_cmdline_parse(void)
opt = strstr(prom_cmd_line, "disable_radix");
if (opt) {
- prom_debug("Radix disabled from cmdline\n");
- prom_radix_disable = true;
+ opt += 13;
+ if (*opt && *opt == '=') {
+ bool val;
+
+ if (kstrtobool(++opt, &val))
+ prom_radix_disable = false;
+ else
+ prom_radix_disable = val;
+ } else
+ prom_radix_disable = true;
}
+ if (prom_radix_disable)
+ prom_debug("Radix disabled from cmdline\n");
}
#if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
@@ -1110,7 +1120,8 @@ static void __init prom_check_platform_support(void)
}
}
- if (supported.radix_mmu && supported.radix_gtse) {
+ if (supported.radix_mmu && supported.radix_gtse &&
+ IS_ENABLED(CONFIG_PPC_RADIX_MMU)) {
/* Radix preferred - but we require GTSE for now */
prom_debug("Asking for radix with GTSE\n");
ibm_architecture_vec.vec5.mmu = OV5_FEAT(OV5_MMU_RADIX);
@@ -1809,16 +1820,8 @@ static void __init prom_initialize_tce_table(void)
* size to 4 MB. This is enough to map 2GB of PCI DMA space.
* By doing this, we avoid the pitfalls of trying to DMA to
* MMIO space and the DMA alias hole.
- *
- * On POWER4, firmware sets the TCE region by assuming
- * each TCE table is 8MB. Using this memory for anything
- * else will impact performance, so we always allocate 8MB.
- * Anton
*/
- if (pvr_version_is(PVR_POWER4) || pvr_version_is(PVR_POWER4p))
- minsize = 8UL << 20;
- else
- minsize = 4UL << 20;
+ minsize = 4UL << 20;
/* Align to the greater of the align or size */
align = max(minalign, minsize);