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Message-ID: <20180511150224.GR1392@brightrain.aerifal.cx>
Date: Fri, 11 May 2018 11:02:24 -0400
From: Rich Felker <dalias@...c.org>
To: Rob Herring <robh@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-sh@...r.kernel.org,
Arnd Bergmann <arnd@...db.de>,
Yoshinori Sato <ysato@...rs.sourceforge.jp>
Subject: Re: [PATCH] sh: switch to NO_BOOTMEM
On Fri, May 11, 2018 at 08:45:59AM -0500, Rob Herring wrote:
> Commit 0fa1c579349f ("of/fdt: use memblock_virt_alloc for early alloc")
> inadvertently switched the DT unflattening allocations from memblock to
> bootmem which doesn't work because the unflattening happens before
> bootmem is initialized. Swapping the order of bootmem init and
> unflattening could also fix this, but removing bootmem is desired. So
> enable NO_BOOTMEM on SH like other architectures have done.
>
> Fixes: 0fa1c579349f ("of/fdt: use memblock_virt_alloc for early alloc")
> Reported-by: Rich Felker <dalias@...c.org>
> Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>
> Signed-off-by: Rob Herring <robh@...nel.org>
> ---
> This is compile tested only, but similar to microblaze and h8300
> conversions. The additional complexity for SH is NUMA support (which to
> me looks like an abuse of NUMA support to map a small amount of
> on-chip? RAM to NUMA nodes).
Thanks! I was just reading the corresponding microblaze commit, and
think this approach makes sense. I'll test it now with both DT and
non-DT sh systems and let you know if it works. If it's good would you
like me to send it upstream via arch/sh? I already have 2
regression-fix patches to submit in a pull request asap.
Rich
> arch/sh/Kconfig | 1 +
> arch/sh/kernel/setup.c | 1 -
> arch/sh/mm/init.c | 68 ++++--------------------------------------
> arch/sh/mm/numa.c | 19 ------------
> 4 files changed, 7 insertions(+), 82 deletions(-)
>
> diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
> index 97fe29316476..1851eaeee131 100644
> --- a/arch/sh/Kconfig
> +++ b/arch/sh/Kconfig
> @@ -9,6 +9,7 @@ config SUPERH
> select HAVE_IDE if HAS_IOPORT_MAP
> select HAVE_MEMBLOCK
> select HAVE_MEMBLOCK_NODE_MAP
> + select NO_BOOTMEM
> select ARCH_DISCARD_MEMBLOCK
> select HAVE_OPROFILE
> select HAVE_GENERIC_DMA_COHERENT
> diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
> index d34e998b809f..c286cf5da6e7 100644
> --- a/arch/sh/kernel/setup.c
> +++ b/arch/sh/kernel/setup.c
> @@ -11,7 +11,6 @@
> #include <linux/ioport.h>
> #include <linux/init.h>
> #include <linux/initrd.h>
> -#include <linux/bootmem.h>
> #include <linux/console.h>
> #include <linux/root_dev.h>
> #include <linux/utsname.h>
> diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
> index ce0bbaa7e404..4034035fbede 100644
> --- a/arch/sh/mm/init.c
> +++ b/arch/sh/mm/init.c
> @@ -211,59 +211,15 @@ void __init allocate_pgdat(unsigned int nid)
>
> NODE_DATA(nid) = __va(phys);
> memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
> -
> - NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
> #endif
>
> NODE_DATA(nid)->node_start_pfn = start_pfn;
> NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
> }
>
> -static void __init bootmem_init_one_node(unsigned int nid)
> -{
> - unsigned long total_pages, paddr;
> - unsigned long end_pfn;
> - struct pglist_data *p;
> -
> - p = NODE_DATA(nid);
> -
> - /* Nothing to do.. */
> - if (!p->node_spanned_pages)
> - return;
> -
> - end_pfn = pgdat_end_pfn(p);
> -
> - total_pages = bootmem_bootmap_pages(p->node_spanned_pages);
> -
> - paddr = memblock_alloc(total_pages << PAGE_SHIFT, PAGE_SIZE);
> - if (!paddr)
> - panic("Can't allocate bootmap for nid[%d]\n", nid);
> -
> - init_bootmem_node(p, paddr >> PAGE_SHIFT, p->node_start_pfn, end_pfn);
> -
> - free_bootmem_with_active_regions(nid, end_pfn);
> -
> - /*
> - * XXX Handle initial reservations for the system memory node
> - * only for the moment, we'll refactor this later for handling
> - * reservations in other nodes.
> - */
> - if (nid == 0) {
> - struct memblock_region *reg;
> -
> - /* Reserve the sections we're already using. */
> - for_each_memblock(reserved, reg) {
> - reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
> - }
> - }
> -
> - sparse_memory_present_with_active_regions(nid);
> -}
> -
> static void __init do_init_bootmem(void)
> {
> struct memblock_region *reg;
> - int i;
>
> /* Add active regions with valid PFNs. */
> for_each_memblock(memory, reg) {
> @@ -279,9 +235,12 @@ static void __init do_init_bootmem(void)
>
> plat_mem_setup();
>
> - for_each_online_node(i)
> - bootmem_init_one_node(i);
> + for_each_memblock(memory, reg) {
> + int nid = memblock_get_region_node(reg);
>
> + memory_present(nid, memblock_region_memory_base_pfn(reg),
> + memblock_region_memory_end_pfn(reg));
> + }
> sparse_init();
> }
>
> @@ -322,7 +281,6 @@ void __init paging_init(void)
> {
> unsigned long max_zone_pfns[MAX_NR_ZONES];
> unsigned long vaddr, end;
> - int nid;
>
> sh_mv.mv_mem_init();
>
> @@ -377,21 +335,7 @@ void __init paging_init(void)
> kmap_coherent_init();
>
> memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
> -
> - for_each_online_node(nid) {
> - pg_data_t *pgdat = NODE_DATA(nid);
> - unsigned long low, start_pfn;
> -
> - start_pfn = pgdat->bdata->node_min_pfn;
> - low = pgdat->bdata->node_low_pfn;
> -
> - if (max_zone_pfns[ZONE_NORMAL] < low)
> - max_zone_pfns[ZONE_NORMAL] = low;
> -
> - printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
> - nid, start_pfn, low);
> - }
> -
> + max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
> free_area_init_nodes(max_zone_pfns);
> }
>
> diff --git a/arch/sh/mm/numa.c b/arch/sh/mm/numa.c
> index 05713d190247..830e8b3684e4 100644
> --- a/arch/sh/mm/numa.c
> +++ b/arch/sh/mm/numa.c
> @@ -8,7 +8,6 @@
> * for more details.
> */
> #include <linux/module.h>
> -#include <linux/bootmem.h>
> #include <linux/memblock.h>
> #include <linux/mm.h>
> #include <linux/numa.h>
> @@ -26,9 +25,7 @@ EXPORT_SYMBOL_GPL(node_data);
> */
> void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
> {
> - unsigned long bootmap_pages;
> unsigned long start_pfn, end_pfn;
> - unsigned long bootmem_paddr;
>
> /* Don't allow bogus node assignment */
> BUG_ON(nid >= MAX_NUMNODES || nid <= 0);
> @@ -48,25 +45,9 @@ void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
> SMP_CACHE_BYTES, end));
> memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
>
> - NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
> NODE_DATA(nid)->node_start_pfn = start_pfn;
> NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
>
> - /* Node-local bootmap */
> - bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
> - bootmem_paddr = memblock_alloc_base(bootmap_pages << PAGE_SHIFT,
> - PAGE_SIZE, end);
> - init_bootmem_node(NODE_DATA(nid), bootmem_paddr >> PAGE_SHIFT,
> - start_pfn, end_pfn);
> -
> - free_bootmem_with_active_regions(nid, end_pfn);
> -
> - /* Reserve the pgdat and bootmap space with the bootmem allocator */
> - reserve_bootmem_node(NODE_DATA(nid), start_pfn << PAGE_SHIFT,
> - sizeof(struct pglist_data), BOOTMEM_DEFAULT);
> - reserve_bootmem_node(NODE_DATA(nid), bootmem_paddr,
> - bootmap_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
> -
> /* It's up */
> node_set_online(nid);
>
> --
> 2.17.0
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