Re: [PATCH v3 3/5] RISC-V: Improve init_resources

From: Palmer Dabbelt
Date: Thu Apr 22 2021 - 23:30:54 EST


On Mon, 05 Apr 2021 01:57:10 PDT (-0700), mick@xxxxxxxxxxxx wrote:
* Kernel region is always present and we know where it is, no
need to look for it inside the loop, just ignore it like the
rest of the reserved regions within system's memory.

* Don't call memblock_free inside the loop, if called it'll split
the region of pre-allocated resources in two parts, messing things
up, just re-use the previous pre-allocated resource and free any
unused resources after both loops finish.

* memblock_alloc may add a region when called, so increase the
number of pre-allocated regions by one to be on the safe side
(reported and patched by Geert Uytterhoeven)

IIUC this one has already been fixen on for-next. Either way, it caused a merge conflict. I think I've fixed it up, LMK if something went wrong.

Also: I cleaned up the commit text a bit, as this is an odd way to do it. It's probably best to just have split this into two commits.


Signed-off-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Signed-off-by: Nick Kossifidis <mick@xxxxxxxxxxxx>
---
arch/riscv/kernel/setup.c | 90 ++++++++++++++++++++-------------------
1 file changed, 46 insertions(+), 44 deletions(-)

diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
index e85bacff1..030554bab 100644
--- a/arch/riscv/kernel/setup.c
+++ b/arch/riscv/kernel/setup.c
@@ -60,6 +60,7 @@ static DEFINE_PER_CPU(struct cpu, cpu_devices);
* also add "System RAM" regions for compatibility with other
* archs, and the rest of the known regions for completeness.
*/
+static struct resource kimage_res = { .name = "Kernel image", };
static struct resource code_res = { .name = "Kernel code", };
static struct resource data_res = { .name = "Kernel data", };
static struct resource rodata_res = { .name = "Kernel rodata", };
@@ -80,45 +81,54 @@ static int __init add_resource(struct resource *parent,
return 1;
}

-static int __init add_kernel_resources(struct resource *res)
+static int __init add_kernel_resources(void)
{
int ret = 0;

/*
* The memory region of the kernel image is continuous and
- * was reserved on setup_bootmem, find it here and register
- * it as a resource, then register the various segments of
- * the image as child nodes
+ * was reserved on setup_bootmem, register it here as a
+ * resource, with the various segments of the image as
+ * child nodes.
*/
- if (!(res->start <= code_res.start && res->end >= data_res.end))
- return 0;

- res->name = "Kernel image";
- res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+ code_res.start = __pa_symbol(_text);
+ code_res.end = __pa_symbol(_etext) - 1;
+ code_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;

- /*
- * We removed a part of this region on setup_bootmem so
- * we need to expand the resource for the bss to fit in.
- */
- res->end = bss_res.end;
+ rodata_res.start = __pa_symbol(__start_rodata);
+ rodata_res.end = __pa_symbol(__end_rodata) - 1;
+ rodata_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;

- ret = add_resource(&iomem_resource, res);
+ data_res.start = __pa_symbol(_data);
+ data_res.end = __pa_symbol(_edata) - 1;
+ data_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+
+ bss_res.start = __pa_symbol(__bss_start);
+ bss_res.end = __pa_symbol(__bss_stop) - 1;
+ bss_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+
+ kimage_res.start = code_res.start;
+ kimage_res.end = bss_res.end;
+ kimage_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+
+ ret = add_resource(&iomem_resource, &kimage_res);
if (ret < 0)
return ret;

- ret = add_resource(res, &code_res);
+ ret = add_resource(&kimage_res, &code_res);
if (ret < 0)
return ret;

- ret = add_resource(res, &rodata_res);
+ ret = add_resource(&kimage_res, &rodata_res);
if (ret < 0)
return ret;

- ret = add_resource(res, &data_res);
+ ret = add_resource(&kimage_res, &data_res);
if (ret < 0)
return ret;

- ret = add_resource(res, &bss_res);
+ ret = add_resource(&kimage_res, &bss_res);

return ret;
}
@@ -129,53 +139,42 @@ static void __init init_resources(void)
struct resource *res = NULL;
struct resource *mem_res = NULL;
size_t mem_res_sz = 0;
- int ret = 0, i = 0;
-
- code_res.start = __pa_symbol(_text);
- code_res.end = __pa_symbol(_etext) - 1;
- code_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
-
- rodata_res.start = __pa_symbol(__start_rodata);
- rodata_res.end = __pa_symbol(__end_rodata) - 1;
- rodata_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
-
- data_res.start = __pa_symbol(_data);
- data_res.end = __pa_symbol(_edata) - 1;
- data_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+ int num_resources = 0, res_idx = 0;
+ int ret = 0;

- bss_res.start = __pa_symbol(__bss_start);
- bss_res.end = __pa_symbol(__bss_stop) - 1;
- bss_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+ /* + 1 as memblock_alloc() might increase memblock.reserved.cnt */
+ num_resources = memblock.memory.cnt + memblock.reserved.cnt + 1;
+ res_idx = num_resources - 1;

- mem_res_sz = (memblock.memory.cnt + memblock.reserved.cnt) * sizeof(*mem_res);
+ mem_res_sz = num_resources * sizeof(*mem_res);
mem_res = memblock_alloc(mem_res_sz, SMP_CACHE_BYTES);
if (!mem_res)
panic("%s: Failed to allocate %zu bytes\n", __func__, mem_res_sz);
+
/*
* Start by adding the reserved regions, if they overlap
* with /memory regions, insert_resource later on will take
* care of it.
*/
+ ret = add_kernel_resources();
+ if (ret < 0)
+ goto error;
+
for_each_reserved_mem_region(region) {
- res = &mem_res[i++];
+ res = &mem_res[res_idx--];

res->name = "Reserved";
res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region));
res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1;

- ret = add_kernel_resources(res);
- if (ret < 0)
- goto error;
- else if (ret)
- continue;
-
/*
* Ignore any other reserved regions within
* system memory.
*/
if (memblock_is_memory(res->start)) {
- memblock_free((phys_addr_t) res, sizeof(struct resource));
+ /* Re-use this pre-allocated resource */
+ res_idx++;
continue;
}

@@ -186,7 +185,7 @@ static void __init init_resources(void)

/* Add /memory regions to the resource tree */
for_each_mem_region(region) {
- res = &mem_res[i++];
+ res = &mem_res[res_idx--];

if (unlikely(memblock_is_nomap(region))) {
res->name = "Reserved";
@@ -204,6 +203,9 @@ static void __init init_resources(void)
goto error;
}

+ /* Clean-up any unused pre-allocated resources */
+ mem_res_sz = (num_resources - res_idx + 1) * sizeof(*mem_res);
+ memblock_free((phys_addr_t) mem_res, mem_res_sz);
return;

error: