Re: [PATCH -next 1/2] riscv: kdump: Implement crashkernel=X,[high,low]
On 2023/3/21 9:42, Leizhen (ThunderTown) wrote:
On 2023/3/21 4:42, Chen Jiahao wrote:
On riscv, the current crash kernel allocation logic is trying to
allocate within 32bit addressible memory region by default, if
failed, try to allocate without 4G restriction.
In need of saving DMA zone memory while allocating a relatively large
crash kernel region, allocating the reserved memory top down in
high memory, without overlapping the DMA zone, is a mature solution.
Here introduce the parameter option crashkernel=X,[high,low].
We can reserve the crash kernel from high memory above DMA zone range
by explicitly passing "crashkernel=X,high"; or reserve a memory range
below 4G with "crashkernel=X,low".
Signed-off-by: Chen Jiahao
---
arch/riscv/kernel/setup.c | 5
arch/riscv/mm/init.c | 56 ---
2 files changed, 58 insertions(+), 3 deletions(-)
diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
index 376d2827e736..d867b1535da4 100644
--- a/arch/riscv/kernel/setup.c
+++ b/arch/riscv/kernel/setup.c
@@ -176,6 +176,11 @@ static void __init init_resources(void)
if (ret < 0)
goto error;
}
+ if (crashk_low_res.start != crashk_low_res.end) {
+ ret = add_resource(_resource, _low_res);
+ if (ret < 0)
+ goto error;
+ }
#endif
#ifdef CONFIG_CRASH_DUMP
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 478d6763a01a..5def2174b243 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -1152,6 +1152,28 @@ static inline void setup_vm_final(void)
}
#endif /* CONFIG_MMU */
+/* Reserve 128M low memory by default for swiotlb buffer */
+#define DEFAULT_CRASH_KERNEL_LOW_SIZE (128UL << 20)
+
+static int __init reserve_crashkernel_low(unsigned long long low_size)
+{
+ unsigned long long low_base;
+
+ low_base = memblock_phys_alloc_range(low_size, PMD_SIZE, 0,
dma32_phys_limit);
+ if (!low_base) {
+ pr_err("cannot allocate crashkernel low memory
(size:0x%llx).\n", low_size);
+ return -ENOMEM;
+ }
+
+ pr_info("crashkernel low memory reserved: 0x%08llx - 0x%08llx (%lld
MB)\n",
For unsigned long long, 08 --> 016.
Sure, I will fix it soon in another version.
+ low_base, low_base + low_size, low_size >> 20);
+
+ crashk_low_res.start = low_base;
+ crashk_low_res.end = low_base + low_size - 1;
+
+ return 0;
+}
+
/*
* reserve_crashkernel() - reserves memory for crash kernel
*
@@ -1163,6 +1185,7 @@ static void __init reserve_crashkernel(void)
{
unsigned long long crash_base = 0;
unsigned long long crash_size = 0;
+ unsigned long long crash_low_size = 0;
unsigned long search_start = memblock_start_of_DRAM();
unsigned long search_end = memblock_end_of_DRAM();
@@ -1182,8 +1205,26 @@ static void __init reserve_crashkernel(void)
ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
_size, _base);
- if (ret || !crash_size)
+ if (ret == -ENOENT) {
+ ret = parse_crashkernel_high(boot_command_line, 0, _size,
_base);
+ if (ret || !crash_size)
+ return;
+
+ /*
+* crashkernel=Y,low can be specified or not, but invalid value
+* is not allowed.
+*/
+ ret = parse_crashkernel_low(boot_command_line, 0, _low_size,
_base);
+ if (ret == -ENOENT)
+ crash_low_size = DEFAULT_CRASH_KERNEL_LOW_SIZE;
+ else if (ret)
+ return;
+
+ search_start = dma32_phys_limit;
+ } else if (ret || !crash_size) {
+ /* Invalid argument value specified */
return;
+ }
crash_size = PAGE_ALIGN(crash_size);
@@ -1201,16 +1242,25 @@ static void __init reserve_crashkernel(void)
*/
crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE,
search_start,
- min(search_end, (unsigned long)
SZ_4G));
+ min(search_end, (unsigned long)
dma32_phys_limit));
if (crash_base == 0) {
/* Try again without restricting region to 32bit addressible
memory */
crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE,
- search_start, search_end);
+ search_start,
search_end);
if (crash_base == 0) {
pr_warn("crashkernel: couldn't allocate %lldKB\n",
crash_size >> 10);
return;
}
+
+ if (!crash_low_size)
+
Re: [PATCH -next 1/2] riscv: kdump: Implement crashkernel=X,[high,low]
On 2023/3/20 22:36, Simon Horman wrote:
On Tue, Mar 21, 2023 at 04:42:43AM +0800, Chen Jiahao wrote:
On riscv, the current crash kernel allocation logic is trying to
allocate within 32bit addressible memory region by default, if
failed, try to allocate without 4G restriction.
In need of saving DMA zone memory while allocating a relatively large
crash kernel region, allocating the reserved memory top down in
high memory, without overlapping the DMA zone, is a mature solution.
Here introduce the parameter option crashkernel=X,[high,low].
We can reserve the crash kernel from high memory above DMA zone range
by explicitly passing "crashkernel=X,high"; or reserve a memory range
below 4G with "crashkernel=X,low".
Signed-off-by: Chen Jiahao
Some minor nits, but I don't think there is any need to respin for them.
Reviewed-by: Simon Horman
I will send another version and clean up these by the way, thanks.
Chen, Jiahao
...
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 478d6763a01a..5def2174b243 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
...
@@ -1201,16 +1242,25 @@ static void __init reserve_crashkernel(void)
*/
crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE,
search_start,
- min(search_end, (unsigned long)
SZ_4G));
+ min(search_end, (unsigned long)
dma32_phys_limit));
nit: While here, you could drop the space before 'ma32_phys_limit'.
Or perhaps use min_t, which seems appropriate here.
if (crash_base == 0) {
/* Try again without restricting region to 32bit addressible
memory */
crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE,
- search_start, search_end);
+ search_start,
search_end);
if (crash_base == 0) {
pr_warn("crashkernel: couldn't allocate %lldKB\n",
crash_size >> 10);
return;
}
+
+ if (!crash_low_size)
+ crash_low_size = DEFAULT_CRASH_KERNEL_LOW_SIZE;
+ }
+
+ if ((crash_base > dma32_phys_limit - crash_low_size) &&
+crash_low_size && reserve_crashkernel_low(crash_low_size)) {
nit: The line above should be aligned one character to the left
(remove one space in the indent).
+ memblock_phys_free(crash_base, crash_size);
+ return;
}
pr_info("crashkernel: reserved 0x%016llx - 0x%016llx (%lld MB)\n",
...
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Re: [PATCH -next 1/2] riscv: kdump: Implement crashkernel=X,[high,low]
On 2023/3/21 4:42, Chen Jiahao wrote:
> On riscv, the current crash kernel allocation logic is trying to
> allocate within 32bit addressible memory region by default, if
> failed, try to allocate without 4G restriction.
>
> In need of saving DMA zone memory while allocating a relatively large
> crash kernel region, allocating the reserved memory top down in
> high memory, without overlapping the DMA zone, is a mature solution.
> Here introduce the parameter option crashkernel=X,[high,low].
>
> We can reserve the crash kernel from high memory above DMA zone range
> by explicitly passing "crashkernel=X,high"; or reserve a memory range
> below 4G with "crashkernel=X,low".
>
> Signed-off-by: Chen Jiahao
> ---
> arch/riscv/kernel/setup.c | 5
> arch/riscv/mm/init.c | 56 ---
> 2 files changed, 58 insertions(+), 3 deletions(-)
>
> diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
> index 376d2827e736..d867b1535da4 100644
> --- a/arch/riscv/kernel/setup.c
> +++ b/arch/riscv/kernel/setup.c
> @@ -176,6 +176,11 @@ static void __init init_resources(void)
> if (ret < 0)
> goto error;
> }
> + if (crashk_low_res.start != crashk_low_res.end) {
> + ret = add_resource(_resource, _low_res);
> + if (ret < 0)
> + goto error;
> + }
> #endif
>
> #ifdef CONFIG_CRASH_DUMP
> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> index 478d6763a01a..5def2174b243 100644
> --- a/arch/riscv/mm/init.c
> +++ b/arch/riscv/mm/init.c
> @@ -1152,6 +1152,28 @@ static inline void setup_vm_final(void)
> }
> #endif /* CONFIG_MMU */
>
> +/* Reserve 128M low memory by default for swiotlb buffer */
> +#define DEFAULT_CRASH_KERNEL_LOW_SIZE(128UL << 20)
> +
> +static int __init reserve_crashkernel_low(unsigned long long low_size)
> +{
> + unsigned long long low_base;
> +
> + low_base = memblock_phys_alloc_range(low_size, PMD_SIZE, 0,
> dma32_phys_limit);
> + if (!low_base) {
> + pr_err("cannot allocate crashkernel low memory
> (size:0x%llx).\n", low_size);
> + return -ENOMEM;
> + }
> +
> + pr_info("crashkernel low memory reserved: 0x%08llx - 0x%08llx (%lld
> MB)\n",
For unsigned long long, 08 --> 016.
> + low_base, low_base + low_size, low_size >> 20);
> +
> + crashk_low_res.start = low_base;
> + crashk_low_res.end = low_base + low_size - 1;
> +
> + return 0;
> +}
> +
> /*
> * reserve_crashkernel() - reserves memory for crash kernel
> *
> @@ -1163,6 +1185,7 @@ static void __init reserve_crashkernel(void)
> {
> unsigned long long crash_base = 0;
> unsigned long long crash_size = 0;
> + unsigned long long crash_low_size = 0;
> unsigned long search_start = memblock_start_of_DRAM();
> unsigned long search_end = memblock_end_of_DRAM();
>
> @@ -1182,8 +1205,26 @@ static void __init reserve_crashkernel(void)
>
> ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
> _size, _base);
> - if (ret || !crash_size)
> + if (ret == -ENOENT) {
> + ret = parse_crashkernel_high(boot_command_line, 0, _size,
> _base);
> + if (ret || !crash_size)
> + return;
> +
> + /*
> + * crashkernel=Y,low can be specified or not, but invalid value
> + * is not allowed.
> + */
> + ret = parse_crashkernel_low(boot_command_line, 0,
> _low_size, _base);
> + if (ret == -ENOENT)
> + crash_low_size = DEFAULT_CRASH_KERNEL_LOW_SIZE;
> + else if (ret)
> + return;
> +
> + search_start = dma32_phys_limit;
> + } else if (ret || !crash_size) {
> + /* Invalid argument value specified */
> return;
> + }
>
> crash_size = PAGE_ALIGN(crash_size);
>
> @@ -1201,16 +1242,25 @@ static void __init reserve_crashkernel(void)
>*/
> crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE,
> search_start,
> -min(search_end, (unsigned long)
> SZ_4G));
> +min(search_end, (unsigned long)
> dma32_phys_limit));
> if (crash_base == 0) {
> /* Try again without restricting region to 32bit addressible
> memory */
> crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE,
> - search_start, search_end);
> +search_start,
> search_end);
> if (crash_base == 0) {
> pr_warn("crashkernel: couldn't allocate %lldKB\n",
> crash_size >> 10);
> return;
> }
> +
> +
Re: [PATCH -next 1/2] riscv: kdump: Implement crashkernel=X,[high,low]
On Tue, Mar 21, 2023 at 04:42:43AM +0800, Chen Jiahao wrote:
> On riscv, the current crash kernel allocation logic is trying to
> allocate within 32bit addressible memory region by default, if
> failed, try to allocate without 4G restriction.
>
> In need of saving DMA zone memory while allocating a relatively large
> crash kernel region, allocating the reserved memory top down in
> high memory, without overlapping the DMA zone, is a mature solution.
> Here introduce the parameter option crashkernel=X,[high,low].
>
> We can reserve the crash kernel from high memory above DMA zone range
> by explicitly passing "crashkernel=X,high"; or reserve a memory range
> below 4G with "crashkernel=X,low".
>
> Signed-off-by: Chen Jiahao
Some minor nits, but I don't think there is any need to respin for them.
Reviewed-by: Simon Horman
...
> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> index 478d6763a01a..5def2174b243 100644
> --- a/arch/riscv/mm/init.c
> +++ b/arch/riscv/mm/init.c
...
> @@ -1201,16 +1242,25 @@ static void __init reserve_crashkernel(void)
>*/
> crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE,
> search_start,
> -min(search_end, (unsigned long)
> SZ_4G));
> +min(search_end, (unsigned long)
> dma32_phys_limit));
nit: While here, you could drop the space before 'ma32_phys_limit'.
Or perhaps use min_t, which seems appropriate here.
> if (crash_base == 0) {
> /* Try again without restricting region to 32bit addressible
> memory */
> crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE,
> - search_start, search_end);
> +search_start,
> search_end);
> if (crash_base == 0) {
> pr_warn("crashkernel: couldn't allocate %lldKB\n",
> crash_size >> 10);
> return;
> }
> +
> + if (!crash_low_size)
> + crash_low_size = DEFAULT_CRASH_KERNEL_LOW_SIZE;
> + }
> +
> + if ((crash_base > dma32_phys_limit - crash_low_size) &&
> + crash_low_size && reserve_crashkernel_low(crash_low_size)) {
nit: The line above should be aligned one character to the left
(remove one space in the indent).
> + memblock_phys_free(crash_base, crash_size);
> + return;
> }
>
> pr_info("crashkernel: reserved 0x%016llx - 0x%016llx (%lld MB)\n",
...
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[PATCH -next 1/2] riscv: kdump: Implement crashkernel=X,[high,low]
On riscv, the current crash kernel allocation logic is trying to
allocate within 32bit addressible memory region by default, if
failed, try to allocate without 4G restriction.
In need of saving DMA zone memory while allocating a relatively large
crash kernel region, allocating the reserved memory top down in
high memory, without overlapping the DMA zone, is a mature solution.
Here introduce the parameter option crashkernel=X,[high,low].
We can reserve the crash kernel from high memory above DMA zone range
by explicitly passing "crashkernel=X,high"; or reserve a memory range
below 4G with "crashkernel=X,low".
Signed-off-by: Chen Jiahao
---
arch/riscv/kernel/setup.c | 5
arch/riscv/mm/init.c | 56 ---
2 files changed, 58 insertions(+), 3 deletions(-)
diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
index 376d2827e736..d867b1535da4 100644
--- a/arch/riscv/kernel/setup.c
+++ b/arch/riscv/kernel/setup.c
@@ -176,6 +176,11 @@ static void __init init_resources(void)
if (ret < 0)
goto error;
}
+ if (crashk_low_res.start != crashk_low_res.end) {
+ ret = add_resource(_resource, _low_res);
+ if (ret < 0)
+ goto error;
+ }
#endif
#ifdef CONFIG_CRASH_DUMP
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 478d6763a01a..5def2174b243 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -1152,6 +1152,28 @@ static inline void setup_vm_final(void)
}
#endif /* CONFIG_MMU */
+/* Reserve 128M low memory by default for swiotlb buffer */
+#define DEFAULT_CRASH_KERNEL_LOW_SIZE (128UL << 20)
+
+static int __init reserve_crashkernel_low(unsigned long long low_size)
+{
+ unsigned long long low_base;
+
+ low_base = memblock_phys_alloc_range(low_size, PMD_SIZE, 0,
dma32_phys_limit);
+ if (!low_base) {
+ pr_err("cannot allocate crashkernel low memory
(size:0x%llx).\n", low_size);
+ return -ENOMEM;
+ }
+
+ pr_info("crashkernel low memory reserved: 0x%08llx - 0x%08llx (%lld
MB)\n",
+ low_base, low_base + low_size, low_size >> 20);
+
+ crashk_low_res.start = low_base;
+ crashk_low_res.end = low_base + low_size - 1;
+
+ return 0;
+}
+
/*
* reserve_crashkernel() - reserves memory for crash kernel
*
@@ -1163,6 +1185,7 @@ static void __init reserve_crashkernel(void)
{
unsigned long long crash_base = 0;
unsigned long long crash_size = 0;
+ unsigned long long crash_low_size = 0;
unsigned long search_start = memblock_start_of_DRAM();
unsigned long search_end = memblock_end_of_DRAM();
@@ -1182,8 +1205,26 @@ static void __init reserve_crashkernel(void)
ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
_size, _base);
- if (ret || !crash_size)
+ if (ret == -ENOENT) {
+ ret = parse_crashkernel_high(boot_command_line, 0, _size,
_base);
+ if (ret || !crash_size)
+ return;
+
+ /*
+* crashkernel=Y,low can be specified or not, but invalid value
+* is not allowed.
+*/
+ ret = parse_crashkernel_low(boot_command_line, 0,
_low_size, _base);
+ if (ret == -ENOENT)
+ crash_low_size = DEFAULT_CRASH_KERNEL_LOW_SIZE;
+ else if (ret)
+ return;
+
+ search_start = dma32_phys_limit;
+ } else if (ret || !crash_size) {
+ /* Invalid argument value specified */
return;
+ }
crash_size = PAGE_ALIGN(crash_size);
@@ -1201,16 +1242,25 @@ static void __init reserve_crashkernel(void)
*/
crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE,
search_start,
- min(search_end, (unsigned long)
SZ_4G));
+ min(search_end, (unsigned long)
dma32_phys_limit));
if (crash_base == 0) {
/* Try again without restricting region to 32bit addressible
memory */
crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE,
- search_start, search_end);
+ search_start,
search_end);
if (crash_base == 0) {
pr_warn("crashkernel: couldn't allocate %lldKB\n",
crash_size >> 10);
return;
}
+
+ if (!crash_low_size)
+ crash_low_size = DEFAULT_CRASH_KERNEL_LOW_SIZE;
+ }
+
+ if ((crash_base > dma32_phys_limit - crash_low_size) &&
+crash_low_size &&
