| Message ID | 20230510-dt-resv-bottom-up-v1-2-3bf68873dbed@gerhold.net |
|---|---|
| State | New |
| Headers | show |
| Series | of: reserved_mem: Provide more control about allocation behavior | expand |
On 15.05.2023 12:12, Stephan Gerhold wrote: > Use memblock_set_bottom_up() to specify an explicit allocation order for > dynamic reservations with "alloc-ranges". Since the default value varies > between architectures the previous value is saved and restored after > trying the allocations. > > If neither alloc-bottom-up or alloc-top-down are specified the previous > implementation-defined allocation order is preserved. > > Signed-off-by: Stephan Gerhold <stephan@gerhold.net> > --- Acked-by: Konrad Dybcio <konrad.dybcio@linaro.org> Konrad > drivers/of/of_reserved_mem.c | 9 ++++++++- > 1 file changed, 8 insertions(+), 1 deletion(-) > > diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c > index 948efa9f99e3..6443140deacf 100644 > --- a/drivers/of/of_reserved_mem.c > +++ b/drivers/of/of_reserved_mem.c > @@ -89,7 +89,7 @@ static int __init __reserved_mem_alloc_size(unsigned long node, > phys_addr_t base = 0, align = 0, size; > int len; > const __be32 *prop; > - bool nomap; > + bool nomap, prev_bottom_up; > int ret; > > prop = of_get_flat_dt_prop(node, "size", &len); > @@ -130,6 +130,12 @@ static int __init __reserved_mem_alloc_size(unsigned long node, > return -EINVAL; > } > > + prev_bottom_up = memblock_bottom_up(); > + if (of_get_flat_dt_prop(node, "alloc-bottom-up", NULL)) > + memblock_set_bottom_up(true); > + if (of_get_flat_dt_prop(node, "alloc-top-down", NULL)) > + memblock_set_bottom_up(false); > + > base = 0; > > while (len > 0) { > @@ -148,6 +154,7 @@ static int __init __reserved_mem_alloc_size(unsigned long node, > len -= t_len; > } > > + memblock_set_bottom_up(prev_bottom_up); > } else { > ret = early_init_dt_alloc_reserved_memory_arch(size, align, > 0, 0, nomap, &base); >
diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c index 948efa9f99e3..6443140deacf 100644 --- a/drivers/of/of_reserved_mem.c +++ b/drivers/of/of_reserved_mem.c @@ -89,7 +89,7 @@ static int __init __reserved_mem_alloc_size(unsigned long node, phys_addr_t base = 0, align = 0, size; int len; const __be32 *prop; - bool nomap; + bool nomap, prev_bottom_up; int ret; prop = of_get_flat_dt_prop(node, "size", &len); @@ -130,6 +130,12 @@ static int __init __reserved_mem_alloc_size(unsigned long node, return -EINVAL; } + prev_bottom_up = memblock_bottom_up(); + if (of_get_flat_dt_prop(node, "alloc-bottom-up", NULL)) + memblock_set_bottom_up(true); + if (of_get_flat_dt_prop(node, "alloc-top-down", NULL)) + memblock_set_bottom_up(false); + base = 0; while (len > 0) { @@ -148,6 +154,7 @@ static int __init __reserved_mem_alloc_size(unsigned long node, len -= t_len; } + memblock_set_bottom_up(prev_bottom_up); } else { ret = early_init_dt_alloc_reserved_memory_arch(size, align, 0, 0, nomap, &base);
Use memblock_set_bottom_up() to specify an explicit allocation order for dynamic reservations with "alloc-ranges". Since the default value varies between architectures the previous value is saved and restored after trying the allocations. If neither alloc-bottom-up or alloc-top-down are specified the previous implementation-defined allocation order is preserved. Signed-off-by: Stephan Gerhold <stephan@gerhold.net> --- drivers/of/of_reserved_mem.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)