1:17 a.m.
From: Kazuhito Hagio <k-hagio-ab(a)nec.com>
While the return value of do_radix_tree() and do_xarray() does not
contain NULL entries, do_maple_tree()'s one contains NULL entries.
Make this behavior consistent with the previous tree functions to make
replacement easier, especially for the following patch.
Signed-off-by: Kazuhito Hagio <k-hagio-ab(a)nec.com>
---
maple_tree.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/maple_tree.c b/maple_tree.c
index 807c17f7dfa0..eccd273105a6 100644
--- a/maple_tree.c
+++ b/maple_tree.c
@@ -287,7 +287,7 @@ static void do_mt_entry(ulong entry, ulong min, ulong max, uint
depth,
static struct req_entry **e = NULL;
struct tree_data *td = ops->is_td ? (struct tree_data *)ops->private : NULL;
- if (ops->entry)
+ if (ops->entry && entry)
ops->entry(entry, entry, path, max, ops->private);
if (!td)
--
2.31.1
1:17 a.m.
New subject: [PATCH 2/2] Fix "irq [-a|-s]" options on Linux 6.5-rc1 and later
From: Kazuhito Hagio <k-hagio-ab(a)nec.com>
Kernel commit 721255b982 ("genirq: Use a maple tree for interrupt
descriptor management"), which is contained in Linux 6.5-rc1 and later
kernels, replaced irq_desc_tree with a maple tree sparse_irqs.
Without the patch, "irq [-a|-s]" options fails with an error, e.g. the
following on x86_64, on kernels configured with CONFIG_SPARSE_IRQS=y.
crash> irq
irq: x86_64_dump_irq: irq_desc[] or irq_desc_tree do not exist?
Signed-off-by: Kazuhito Hagio <k-hagio-ab(a)nec.com>
---
defs.h | 2 ++
kernel.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++++---
symbols.c | 1 +
x86_64.c | 10 ++++++----
4 files changed, 57 insertions(+), 7 deletions(-)
diff --git a/defs.h b/defs.h
index 26afe232cc3e..358f365585cf 100644
--- a/defs.h
+++ b/defs.h
@@ -676,6 +676,7 @@ struct new_utsname {
#define IRQ_DESC_TREE_XARRAY (0x80ULL)
#define KMOD_PAX (0x100ULL)
#define KMOD_MEMORY (0x200ULL)
+#define IRQ_DESC_TREE_MAPLE (0x400ULL)
#define XEN() (kt->flags & ARCH_XEN)
#define OPENVZ() (kt->flags & ARCH_OPENVZ)
@@ -2222,6 +2223,7 @@ struct offset_table { /* stash of commonly-used
offsets */
long module_mem;
long module_memory_base;
long module_memory_size;
+ long irq_data_irq;
};
struct size_table { /* stash of commonly-used sizes */
diff --git a/kernel.c b/kernel.c
index 639ed64f306a..0d72eaeeb79b 100644
--- a/kernel.c
+++ b/kernel.c
@@ -541,7 +541,10 @@ kernel_init()
MEMBER_OFFSET_INIT(irqaction_dev_id, "irqaction", "dev_id");
MEMBER_OFFSET_INIT(irqaction_next, "irqaction", "next");
- if (kernel_symbol_exists("irq_desc_tree")) {
+ /* 6.5 and later: CONFIG_SPARSE_IRQ */
+ if (kernel_symbol_exists("sparse_irqs"))
+ kt->flags2 |= IRQ_DESC_TREE_MAPLE;
+ else if (kernel_symbol_exists("irq_desc_tree")) {
get_symbol_type("irq_desc_tree", NULL, &req);
if (STREQ(req.type_tag_name, "xarray")) {
kt->flags2 |= IRQ_DESC_TREE_XARRAY;
@@ -554,6 +557,7 @@ kernel_init()
}
STRUCT_SIZE_INIT(irq_data, "irq_data");
if (VALID_STRUCT(irq_data)) {
+ MEMBER_OFFSET_INIT(irq_data_irq, "irq_data", "irq");
MEMBER_OFFSET_INIT(irq_data_chip, "irq_data", "chip");
MEMBER_OFFSET_INIT(irq_data_affinity, "irq_data", "affinity");
MEMBER_OFFSET_INIT(irq_desc_irq_data, "irq_desc", "irq_data");
@@ -6180,6 +6184,8 @@ dump_kernel_table(int verbose)
fprintf(fp, "%sIRQ_DESC_TREE_RADIX", others++ ? "|" :
"");
if (kt->flags2 & IRQ_DESC_TREE_XARRAY)
fprintf(fp, "%sIRQ_DESC_TREE_XARRAY", others++ ? "|" :
"");
+ if (kt->flags2 & IRQ_DESC_TREE_MAPLE)
+ fprintf(fp, "%sIRQ_DESC_TREE_MAPLE", others++ ? "|" :
"");
if (kt->flags2 & KMOD_PAX)
fprintf(fp, "%sKMOD_PAX", others++ ? "|" : "");
if (kt->flags2 & KMOD_MEMORY)
@@ -6652,6 +6658,45 @@ get_irq_desc_addr(int irq)
readmem(ptr, KVADDR, &addr,
sizeof(void *), "irq_desc_ptrs entry",
FAULT_ON_ERROR);
+ } else if (kt->flags2 & IRQ_DESC_TREE_MAPLE) {
+ unsigned int i;
+
+ if (kt->highest_irq && (irq > kt->highest_irq))
+ return addr;
+
+ cnt = do_maple_tree(symbol_value("sparse_irqs"), MAPLE_TREE_COUNT, NULL);
+
+ len = sizeof(struct list_pair) * (cnt+1);
+ lp = (struct list_pair *)GETBUF(len);
+ lp[0].index = cnt; /* maxcount */
+
+ cnt = do_maple_tree(symbol_value("sparse_irqs"), MAPLE_TREE_GATHER, lp);
+
+ /*
+ * NOTE: We cannot use lp.index like Radix Tree or XArray because
+ * it's not an absolute index and just counter in Maple Tree.
+ */
+ if (kt->highest_irq == 0) {
+ readmem((ulong)lp[cnt-1].value +
+ OFFSET(irq_desc_irq_data) + OFFSET(irq_data_irq),
+ KVADDR, &kt->highest_irq, sizeof(int), "irq_data.irq",
+ FAULT_ON_ERROR);
+ }
+
+ for (c = 0; c < cnt; c++) {
+ readmem((ulong)lp[c].value +
+ OFFSET(irq_desc_irq_data) + OFFSET(irq_data_irq),
+ KVADDR, &i, sizeof(int), "irq_data.irq", FAULT_ON_ERROR);
+ if (i == irq) {
+ if (CRASHDEBUG(1))
+ fprintf(fp, "index: %d value: %lx\n",
+ i, (ulong)lp[c].value);
+ addr = (ulong)lp[c].value;
+ break;
+ }
+ }
+ FREEBUF(lp);
+
} else if (kt->flags2 & (IRQ_DESC_TREE_RADIX|IRQ_DESC_TREE_XARRAY)) {
if (kt->highest_irq && (irq > kt->highest_irq))
return addr;
@@ -6700,8 +6745,8 @@ get_irq_desc_addr(int irq)
FREEBUF(lp);
} else {
error(FATAL,
- "neither irq_desc, _irq_desc, irq_desc_ptrs "
- "or irq_desc_tree symbols exist\n");
+ "neither irq_desc, _irq_desc, irq_desc_ptrs, "
+ "irq_desc_tree or sparse_irqs symbols exist\n");
}
return addr;
diff --git a/symbols.c b/symbols.c
index 82529a6785c9..876be7aea90e 100644
--- a/symbols.c
+++ b/symbols.c
@@ -10375,6 +10375,7 @@ dump_offset_table(char *spec, ulong makestruct)
OFFSET(irq_desc_t_kstat_irqs));
fprintf(fp, " irq_desc_t_affinity: %ld\n",
OFFSET(irq_desc_t_affinity));
+ fprintf(fp, " irq_data_irq: %ld\n", OFFSET(irq_data_irq));
fprintf(fp, " irq_data_chip: %ld\n",
OFFSET(irq_data_chip));
fprintf(fp, " irq_data_affinity: %ld\n",
diff --git a/x86_64.c b/x86_64.c
index 87e87ae6e1e8..095ba3398b99 100644
--- a/x86_64.c
+++ b/x86_64.c
@@ -5391,7 +5391,8 @@ get_x86_64_frame(struct bt_info *bt, ulong *getpc, ulong *getsp)
static void
x86_64_dump_irq(int irq)
{
- if (symbol_exists("irq_desc") ||
+ if (kernel_symbol_exists("sparse_irqs") ||
+ symbol_exists("irq_desc") ||
kernel_symbol_exists("irq_desc_ptrs") ||
kernel_symbol_exists("irq_desc_tree")) {
machdep->dump_irq = generic_dump_irq;
@@ -5405,7 +5406,8 @@ x86_64_dump_irq(int irq)
static void
x86_64_get_irq_affinity(int irq)
{
- if (symbol_exists("irq_desc") ||
+ if (kernel_symbol_exists("sparse_irqs") ||
+ symbol_exists("irq_desc") ||
kernel_symbol_exists("irq_desc_ptrs") ||
kernel_symbol_exists("irq_desc_tree")) {
machdep->get_irq_affinity = generic_get_irq_affinity;
@@ -5419,8 +5421,8 @@ x86_64_get_irq_affinity(int irq)
static void
x86_64_show_interrupts(int irq, ulong *cpus)
{
- if (symbol_exists("irq_desc") ||
- kernel_symbol_exists("irq_desc_ptrs") ||
+ if (kernel_symbol_exists("sparse_irqs") ||
+ symbol_exists("irq_desc") ||
kernel_symbol_exists("irq_desc_tree")) {
machdep->show_interrupts = generic_show_interrupts;
return(generic_show_interrupts(irq, cpus));
--
2.31.1
2:30 a.m.
New subject: [PATCH 2/2] Fix "irq [-a|-s]" options on Linux 6.5-rc1 and later
On Fri, Jul 7, 2023 at 2:17 PM HAGIO KAZUHITO(萩尾 一仁) <k-hagio-ab(a)nec.com>
wrote:
From: Kazuhito Hagio <k-hagio-ab(a)nec.com>
Kernel commit 721255b982 ("genirq: Use a maple tree for interrupt
descriptor management"), which is contained in Linux 6.5-rc1 and later
kernels, replaced irq_desc_tree with a maple tree sparse_irqs.
Thank you for the fix, Kazu. Only two comments:
Without the patch, "irq [-a|-s]" options fails with an error, e.g. the
following on x86_64, on kernels configured with
CONFIG_SPARSE_IRQS=y.
^^^^^
It should be "CONFIG_SPARSE_IRQ=y", the following code comment is right.
Maybe it's a typo?
+ /* 6.5 and later: CONFIG_SPARSE_IRQ */
crash> irq
irq: x86_64_dump_irq: irq_desc[] or irq_desc_tree do not exist?
Signed-off-by: Kazuhito Hagio <k-hagio-ab(a)nec.com>
---
defs.h | 2 ++
kernel.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++++---
symbols.c | 1 +
x86_64.c | 10 ++++++----
4 files changed, 57 insertions(+), 7 deletions(-)
diff --git a/defs.h b/defs.h
index 26afe232cc3e..358f365585cf 100644
--- a/defs.h
+++ b/defs.h
@@ -676,6 +676,7 @@ struct new_utsname {
#define IRQ_DESC_TREE_XARRAY (0x80ULL)
#define KMOD_PAX (0x100ULL)
#define KMOD_MEMORY (0x200ULL)
+#define IRQ_DESC_TREE_MAPLE (0x400ULL)
#define XEN() (kt->flags & ARCH_XEN)
#define OPENVZ() (kt->flags & ARCH_OPENVZ)
@@ -2222,6 +2223,7 @@ struct offset_table { /* stash of
commonly-used offsets */
long module_mem;
long module_memory_base;
long module_memory_size;
+ long irq_data_irq;
};
struct size_table { /* stash of commonly-used sizes */
diff --git a/kernel.c b/kernel.c
index 639ed64f306a..0d72eaeeb79b 100644
--- a/kernel.c
+++ b/kernel.c
@@ -541,7 +541,10 @@ kernel_init()
MEMBER_OFFSET_INIT(irqaction_dev_id, "irqaction", "dev_id");
MEMBER_OFFSET_INIT(irqaction_next, "irqaction", "next");
- if (kernel_symbol_exists("irq_desc_tree")) {
+ /* 6.5 and later: CONFIG_SPARSE_IRQ */
+ if (kernel_symbol_exists("sparse_irqs"))
+ kt->flags2 |= IRQ_DESC_TREE_MAPLE;
+ else if (kernel_symbol_exists("irq_desc_tree")) {
get_symbol_type("irq_desc_tree", NULL, &req);
if (STREQ(req.type_tag_name, "xarray")) {
kt->flags2 |= IRQ_DESC_TREE_XARRAY;
@@ -554,6 +557,7 @@ kernel_init()
}
STRUCT_SIZE_INIT(irq_data, "irq_data");
if (VALID_STRUCT(irq_data)) {
+ MEMBER_OFFSET_INIT(irq_data_irq, "irq_data", "irq");
MEMBER_OFFSET_INIT(irq_data_chip, "irq_data",
"chip");
MEMBER_OFFSET_INIT(irq_data_affinity, "irq_data",
"affinity");
MEMBER_OFFSET_INIT(irq_desc_irq_data, "irq_desc",
"irq_data");
@@ -6180,6 +6184,8 @@ dump_kernel_table(int verbose)
fprintf(fp, "%sIRQ_DESC_TREE_RADIX", others++ ? "|" :
"");
if (kt->flags2 & IRQ_DESC_TREE_XARRAY)
fprintf(fp, "%sIRQ_DESC_TREE_XARRAY", others++ ? "|"
: "");
+ if (kt->flags2 & IRQ_DESC_TREE_MAPLE)
+ fprintf(fp, "%sIRQ_DESC_TREE_MAPLE", others++ ? "|" :
"");
if (kt->flags2 & KMOD_PAX)
fprintf(fp, "%sKMOD_PAX", others++ ? "|" :
"");
if (kt->flags2 & KMOD_MEMORY)
@@ -6652,6 +6658,45 @@ get_irq_desc_addr(int irq)
readmem(ptr, KVADDR, &addr,
sizeof(void *), "irq_desc_ptrs entry",
FAULT_ON_ERROR);
+ } else if (kt->flags2 & IRQ_DESC_TREE_MAPLE) {
+ unsigned int i;
+
+ if (kt->highest_irq && (irq > kt->highest_irq))
+ return addr;
+
+ cnt = do_maple_tree(symbol_value("sparse_irqs"),
MAPLE_TREE_COUNT, NULL);
+
+ len = sizeof(struct list_pair) * (cnt+1);
+ lp = (struct list_pair *)GETBUF(len);
+ lp[0].index = cnt; /* maxcount */
+
+ cnt = do_maple_tree(symbol_value("sparse_irqs"),
MAPLE_TREE_GATHER, lp);
+
+ /*
+ * NOTE: We cannot use lp.index like Radix Tree or XArray
because
+ * it's not an absolute index and just counter in Maple
Tree.
+ */
+ if (kt->highest_irq == 0) {
+ readmem((ulong)lp[cnt-1].value +
+ OFFSET(irq_desc_irq_data) +
OFFSET(irq_data_irq),
+ KVADDR, &kt->highest_irq, sizeof(int),
"irq_data.irq",
+ FAULT_ON_ERROR);
+ }
+
+ for (c = 0; c < cnt; c++) {
+ readmem((ulong)lp[c].value +
+ OFFSET(irq_desc_irq_data) +
OFFSET(irq_data_irq),
+ KVADDR, &i, sizeof(int), "irq_data.irq",
FAULT_ON_ERROR);
+ if (i == irq) {
+ if (CRASHDEBUG(1))
+ fprintf(fp, "index: %d value:
%lx\n",
+ i, (ulong)lp[c].value);
+ addr = (ulong)lp[c].value;
+ break;
+ }
+ }
+ FREEBUF(lp);
+
} else if (kt->flags2 &
(IRQ_DESC_TREE_RADIX|IRQ_DESC_TREE_XARRAY)) {
if (kt->highest_irq && (irq > kt->highest_irq))
return addr;
@@ -6700,8 +6745,8 @@ get_irq_desc_addr(int irq)
FREEBUF(lp);
} else {
error(FATAL,
- "neither irq_desc, _irq_desc, irq_desc_ptrs "
- "or irq_desc_tree symbols exist\n");
+ "neither irq_desc, _irq_desc, irq_desc_ptrs, "
+ "irq_desc_tree or sparse_irqs symbols exist\n");
}
return addr;
diff --git a/symbols.c b/symbols.c
index 82529a6785c9..876be7aea90e 100644
--- a/symbols.c
+++ b/symbols.c
@@ -10375,6 +10375,7 @@ dump_offset_table(char *spec, ulong makestruct)
OFFSET(irq_desc_t_kstat_irqs));
fprintf(fp, " irq_desc_t_affinity: %ld\n",
OFFSET(irq_desc_t_affinity));
+ fprintf(fp, " irq_data_irq: %ld\n",
OFFSET(irq_data_irq));
fprintf(fp, " irq_data_chip: %ld\n",
OFFSET(irq_data_chip));
fprintf(fp, " irq_data_affinity: %ld\n",
diff --git a/x86_64.c b/x86_64.c
index 87e87ae6e1e8..095ba3398b99 100644
--- a/x86_64.c
+++ b/x86_64.c
@@ -5391,7 +5391,8 @@ get_x86_64_frame(struct bt_info *bt, ulong *getpc,
ulong *getsp)
static void
x86_64_dump_irq(int irq)
{
- if (symbol_exists("irq_desc") ||
+ if (kernel_symbol_exists("sparse_irqs") ||
+ symbol_exists("irq_desc") ||
kernel_symbol_exists("irq_desc_ptrs") ||
kernel_symbol_exists("irq_desc_tree")) {
machdep->dump_irq = generic_dump_irq;
@@ -5405,7 +5406,8 @@ x86_64_dump_irq(int irq)
static void
x86_64_get_irq_affinity(int irq)
{
- if (symbol_exists("irq_desc") ||
+ if (kernel_symbol_exists("sparse_irqs") ||
+ symbol_exists("irq_desc") ||
kernel_symbol_exists("irq_desc_ptrs") ||
kernel_symbol_exists("irq_desc_tree")) {
machdep->get_irq_affinity = generic_get_irq_affinity;
@@ -5419,8 +5421,8 @@ x86_64_get_irq_affinity(int irq)
static void
x86_64_show_interrupts(int irq, ulong *cpus)
{
- if (symbol_exists("irq_desc") ||
- kernel_symbol_exists("irq_desc_ptrs") ||
The check for kernel_symbol_exists("irq_desc_ptrs") is removed in this
function, is that expected behavior? But the above two functions still
retain the kernel_symbol_exists("irq_desc_ptrs") condition check.
Thanks.
Lianbo
+ if (kernel_symbol_exists("sparse_irqs") ||
+ symbol_exists("irq_desc") ||
kernel_symbol_exists("irq_desc_tree")) {
machdep->show_interrupts = generic_show_interrupts;
return(generic_show_interrupts(irq, cpus));
--
2.31.1
2:48 a.m.
New subject: [PATCH 2/2] Fix "irq [-a|-s]" options on Linux 6.5-rc1 and later
On 2023/07/12 16:30, lijiang wrote:
On Fri, Jul 7, 2023 at 2:17 PM HAGIO KAZUHITO(萩尾 一仁)
<k-hagio-ab(a)nec.com>
wrote:
> From: Kazuhito Hagio <k-hagio-ab(a)nec.com>
>
> Kernel commit 721255b982 ("genirq: Use a maple tree for interrupt
> descriptor management"), which is contained in Linux 6.5-rc1 and later
> kernels, replaced irq_desc_tree with a maple tree sparse_irqs.
>
>
Thank you for the fix, Kazu. Only two comments:
Without the patch, "irq [-a|-s]" options fails with an error, e.g. the
> following on x86_64, on kernels configured with CONFIG_SPARSE_IRQS=y.
>
^^^^^
It should be "CONFIG_SPARSE_IRQ=y", the following code comment is right.
Maybe it's a typo?
+ /* 6.5 and later: CONFIG_SPARSE_IRQ */
Yes, you are right. Will fix the commit log.
> @@ -5419,8 +5421,8 @@ x86_64_get_irq_affinity(int irq)
> static void
> x86_64_show_interrupts(int irq, ulong *cpus)
> {
> - if (symbol_exists("irq_desc") ||
> - kernel_symbol_exists("irq_desc_ptrs") ||
>
The check for kernel_symbol_exists("irq_desc_ptrs") is removed in this
function, is that expected behavior? But the above two functions still
retain the kernel_symbol_exists("irq_desc_ptrs") condition check.
ugh, thank you for pointing this out, I didn't intend to remove it.
Will fix this and post a v2.
Thanks,
Kazu
3:17 a.m.
New subject: [PATCH 2/2] Fix "irq [-a|-s]" options on Linux 6.5-rc1 and later
On Wed, Jul 12, 2023 at 3:49 PM HAGIO KAZUHITO(萩尾 一仁) <k-hagio-ab(a)nec.com>
wrote:
On 2023/07/12 16:30, lijiang wrote:
> On Fri, Jul 7, 2023 at 2:17 PM HAGIO KAZUHITO(萩尾 一仁) <k-hagio-ab(a)nec.com
>
> wrote:
>
>> From: Kazuhito Hagio <k-hagio-ab(a)nec.com>
>>
>> Kernel commit 721255b982 ("genirq: Use a maple tree for interrupt
>> descriptor management"), which is contained in Linux 6.5-rc1 and later
>> kernels, replaced irq_desc_tree with a maple tree sparse_irqs.
>>
>>
> Thank you for the fix, Kazu. Only two comments:
>
> Without the patch, "irq [-a|-s]" options fails with an error, e.g. the
>> following on x86_64, on kernels configured with CONFIG_SPARSE_IRQS=y.
>>
>
> ^^^^^
>
> It should be "CONFIG_SPARSE_IRQ=y", the following code comment is right.
> Maybe it's a typo?
> + /* 6.5 and later: CONFIG_SPARSE_IRQ */
Yes, you are right. Will fix the commit log.
>> @@ -5419,8 +5421,8 @@ x86_64_get_irq_affinity(int irq)
>> static void
>> x86_64_show_interrupts(int irq, ulong *cpus)
>> {
>> - if (symbol_exists("irq_desc") ||
>> - kernel_symbol_exists("irq_desc_ptrs") ||
>>
>
> The check for kernel_symbol_exists("irq_desc_ptrs") is removed in this
> function, is that expected behavior? But the above two functions still
> retain the kernel_symbol_exists("irq_desc_ptrs") condition check.
ugh, thank you for pointing this out, I didn't intend to remove it.
Will fix this and post a v2.
In addition, I also saw that there is a similar case on IA64 arch, but I
can not test it. Maybe leave it there?
static void
ia64_dump_irq(int irq)
{
if (symbol_exists("irq_desc") || symbol_exists("_irq_desc")
||
kernel_symbol_exists("irq_desc_ptrs")) {
machdep->dump_irq = generic_dump_irq;
return(generic_dump_irq(irq));
}
...
}
Thanks.
Lianbo
3:30 a.m.
New subject: [PATCH 2/2] Fix "irq [-a|-s]" options on Linux 6.5-rc1 and later
On 2023/07/12 17:17, lijiang wrote:
On Wed, Jul 12, 2023 at 3:49 PM HAGIO KAZUHITO(萩尾 一仁)
<k-hagio-ab(a)nec.com>
wrote:
> On 2023/07/12 16:30, lijiang wrote:
>> On Fri, Jul 7, 2023 at 2:17 PM HAGIO KAZUHITO(萩尾 一仁) <k-hagio-ab(a)nec.com
>>
>> wrote:
>>
>>> From: Kazuhito Hagio <k-hagio-ab(a)nec.com>
>>>
>>> Kernel commit 721255b982 ("genirq: Use a maple tree for interrupt
>>> descriptor management"), which is contained in Linux 6.5-rc1 and later
>>> kernels, replaced irq_desc_tree with a maple tree sparse_irqs.
>>>
>>>
>> Thank you for the fix, Kazu. Only two comments:
>>
>> Without the patch, "irq [-a|-s]" options fails with an error, e.g.
the
>>> following on x86_64, on kernels configured with CONFIG_SPARSE_IRQS=y.
>>>
>>
>> ^^^^^
>>
>> It should be "CONFIG_SPARSE_IRQ=y", the following code comment is
right.
>> Maybe it's a typo?
>> + /* 6.5 and later: CONFIG_SPARSE_IRQ */
>
> Yes, you are right. Will fix the commit log.
>
>>> @@ -5419,8 +5421,8 @@ x86_64_get_irq_affinity(int irq)
>>> static void
>>> x86_64_show_interrupts(int irq, ulong *cpus)
>>> {
>>> - if (symbol_exists("irq_desc") ||
>>> - kernel_symbol_exists("irq_desc_ptrs") ||
>>>
>>
>> The check for kernel_symbol_exists("irq_desc_ptrs") is removed in
this
>> function, is that expected behavior? But the above two functions still
>> retain the kernel_symbol_exists("irq_desc_ptrs") condition check.
>
> ugh, thank you for pointing this out, I didn't intend to remove it.
> Will fix this and post a v2.
>
>
In addition, I also saw that there is a similar case on IA64 arch, but I
can not test it. Maybe leave it there?
static void
ia64_dump_irq(int irq)
{
if (symbol_exists("irq_desc") || symbol_exists("_irq_desc")
||
kernel_symbol_exists("irq_desc_ptrs")) {
machdep->dump_irq = generic_dump_irq;
return(generic_dump_irq(irq));
}
...
}
I also cannot test ia64, but it will be needed, let's add it here too.
Thanks,
Kazu
3:36 a.m.
New subject: [PATCH 2/2] Fix "irq [-a|-s]" options on Linux 6.5-rc1 and later
On Wed, Jul 12, 2023 at 4:30 PM HAGIO KAZUHITO(萩尾 一仁) <k-hagio-ab(a)nec.com>
wrote:
> In addition, I also saw that there is a similar case on IA64
arch, but I
> can not test it. Maybe leave it there?
>
> static void
> ia64_dump_irq(int irq)
> {
> if (symbol_exists("irq_desc") ||
symbol_exists("_irq_desc") ||
> kernel_symbol_exists("irq_desc_ptrs")) {
> machdep->dump_irq = generic_dump_irq;
> return(generic_dump_irq(irq));
> }
> ...
> }
I also cannot test ia64, but it will be needed, let's add it here too.
Ok, thank you, Kazu.
Lianbo
3:55 a.m.
New subject: [PATCH v2 2/2] Fix "irq [-a|-s]" options on Linux 6.5-rc1 and later
From: Kazuhito Hagio <k-hagio-ab(a)nec.com>
Kernel commit 721255b982 ("genirq: Use a maple tree for interrupt
descriptor management"), which is contained in Linux 6.5-rc1 and later
kernels, replaced irq_desc_tree with a maple tree sparse_irqs.
Without the patch, "irq [-a|-s]" options fail with an error, e.g. the
following on x86_64, on kernels configured with CONFIG_SPARSE_IRQ=y.
crash> irq
irq: x86_64_dump_irq: irq_desc[] or irq_desc_tree do not exist?
Signed-off-by: Kazuhito Hagio <k-hagio-ab(a)nec.com>
---
v1 -> v2
- Fixed a typo in the commit log: s/SPARSE_IRQS/SPARSE_IRQ/
- Reverted the unintendedly removed line in x86_64_show_interrupts()
- Added sparse_irqs support to ia64_dump_irq()
defs.h | 2 ++
ia64.c | 3 ++-
kernel.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++++---
symbols.c | 1 +
x86_64.c | 9 ++++++---
5 files changed, 59 insertions(+), 7 deletions(-)
diff --git a/defs.h b/defs.h
index 26afe232cc3e..358f365585cf 100644
--- a/defs.h
+++ b/defs.h
@@ -676,6 +676,7 @@ struct new_utsname {
#define IRQ_DESC_TREE_XARRAY (0x80ULL)
#define KMOD_PAX (0x100ULL)
#define KMOD_MEMORY (0x200ULL)
+#define IRQ_DESC_TREE_MAPLE (0x400ULL)
#define XEN() (kt->flags & ARCH_XEN)
#define OPENVZ() (kt->flags & ARCH_OPENVZ)
@@ -2222,6 +2223,7 @@ struct offset_table { /* stash of commonly-used
offsets */
long module_mem;
long module_memory_base;
long module_memory_size;
+ long irq_data_irq;
};
struct size_table { /* stash of commonly-used sizes */
diff --git a/ia64.c b/ia64.c
index 2e1d15fe6042..d3e0a3b01869 100644
--- a/ia64.c
+++ b/ia64.c
@@ -791,7 +791,8 @@ ia64_back_trace_cmd(struct bt_info *bt)
static void
ia64_dump_irq(int irq)
{
- if (symbol_exists("irq_desc") || symbol_exists("_irq_desc")
||
+ if (kernel_symbol_exists("sparse_irqs") ||
+ symbol_exists("irq_desc") || symbol_exists("_irq_desc") ||
kernel_symbol_exists("irq_desc_ptrs")) {
machdep->dump_irq = generic_dump_irq;
return(generic_dump_irq(irq));
diff --git a/kernel.c b/kernel.c
index 0fc77c19f12a..546eed95eebd 100644
--- a/kernel.c
+++ b/kernel.c
@@ -541,7 +541,10 @@ kernel_init()
MEMBER_OFFSET_INIT(irqaction_dev_id, "irqaction", "dev_id");
MEMBER_OFFSET_INIT(irqaction_next, "irqaction", "next");
- if (kernel_symbol_exists("irq_desc_tree")) {
+ /* 6.5 and later: CONFIG_SPARSE_IRQ */
+ if (kernel_symbol_exists("sparse_irqs"))
+ kt->flags2 |= IRQ_DESC_TREE_MAPLE;
+ else if (kernel_symbol_exists("irq_desc_tree")) {
get_symbol_type("irq_desc_tree", NULL, &req);
if (STREQ(req.type_tag_name, "xarray")) {
kt->flags2 |= IRQ_DESC_TREE_XARRAY;
@@ -554,6 +557,7 @@ kernel_init()
}
STRUCT_SIZE_INIT(irq_data, "irq_data");
if (VALID_STRUCT(irq_data)) {
+ MEMBER_OFFSET_INIT(irq_data_irq, "irq_data", "irq");
MEMBER_OFFSET_INIT(irq_data_chip, "irq_data", "chip");
MEMBER_OFFSET_INIT(irq_data_affinity, "irq_data", "affinity");
MEMBER_OFFSET_INIT(irq_desc_irq_data, "irq_desc", "irq_data");
@@ -6180,6 +6184,8 @@ dump_kernel_table(int verbose)
fprintf(fp, "%sIRQ_DESC_TREE_RADIX", others++ ? "|" :
"");
if (kt->flags2 & IRQ_DESC_TREE_XARRAY)
fprintf(fp, "%sIRQ_DESC_TREE_XARRAY", others++ ? "|" :
"");
+ if (kt->flags2 & IRQ_DESC_TREE_MAPLE)
+ fprintf(fp, "%sIRQ_DESC_TREE_MAPLE", others++ ? "|" :
"");
if (kt->flags2 & KMOD_PAX)
fprintf(fp, "%sKMOD_PAX", others++ ? "|" : "");
if (kt->flags2 & KMOD_MEMORY)
@@ -6652,6 +6658,45 @@ get_irq_desc_addr(int irq)
readmem(ptr, KVADDR, &addr,
sizeof(void *), "irq_desc_ptrs entry",
FAULT_ON_ERROR);
+ } else if (kt->flags2 & IRQ_DESC_TREE_MAPLE) {
+ unsigned int i;
+
+ if (kt->highest_irq && (irq > kt->highest_irq))
+ return addr;
+
+ cnt = do_maple_tree(symbol_value("sparse_irqs"), MAPLE_TREE_COUNT, NULL);
+
+ len = sizeof(struct list_pair) * (cnt+1);
+ lp = (struct list_pair *)GETBUF(len);
+ lp[0].index = cnt; /* maxcount */
+
+ cnt = do_maple_tree(symbol_value("sparse_irqs"), MAPLE_TREE_GATHER, lp);
+
+ /*
+ * NOTE: We cannot use lp.index like Radix Tree or XArray because
+ * it's not an absolute index and just counter in Maple Tree.
+ */
+ if (kt->highest_irq == 0) {
+ readmem((ulong)lp[cnt-1].value +
+ OFFSET(irq_desc_irq_data) + OFFSET(irq_data_irq),
+ KVADDR, &kt->highest_irq, sizeof(int), "irq_data.irq",
+ FAULT_ON_ERROR);
+ }
+
+ for (c = 0; c < cnt; c++) {
+ readmem((ulong)lp[c].value +
+ OFFSET(irq_desc_irq_data) + OFFSET(irq_data_irq),
+ KVADDR, &i, sizeof(int), "irq_data.irq", FAULT_ON_ERROR);
+ if (i == irq) {
+ if (CRASHDEBUG(1))
+ fprintf(fp, "index: %d value: %lx\n",
+ i, (ulong)lp[c].value);
+ addr = (ulong)lp[c].value;
+ break;
+ }
+ }
+ FREEBUF(lp);
+
} else if (kt->flags2 & (IRQ_DESC_TREE_RADIX|IRQ_DESC_TREE_XARRAY)) {
if (kt->highest_irq && (irq > kt->highest_irq))
return addr;
@@ -6700,8 +6745,8 @@ get_irq_desc_addr(int irq)
FREEBUF(lp);
} else {
error(FATAL,
- "neither irq_desc, _irq_desc, irq_desc_ptrs "
- "or irq_desc_tree symbols exist\n");
+ "neither irq_desc, _irq_desc, irq_desc_ptrs, "
+ "irq_desc_tree or sparse_irqs symbols exist\n");
}
return addr;
diff --git a/symbols.c b/symbols.c
index 82529a6785c9..876be7aea90e 100644
--- a/symbols.c
+++ b/symbols.c
@@ -10375,6 +10375,7 @@ dump_offset_table(char *spec, ulong makestruct)
OFFSET(irq_desc_t_kstat_irqs));
fprintf(fp, " irq_desc_t_affinity: %ld\n",
OFFSET(irq_desc_t_affinity));
+ fprintf(fp, " irq_data_irq: %ld\n", OFFSET(irq_data_irq));
fprintf(fp, " irq_data_chip: %ld\n",
OFFSET(irq_data_chip));
fprintf(fp, " irq_data_affinity: %ld\n",
diff --git a/x86_64.c b/x86_64.c
index 87e87ae6e1e8..42ade4817ad9 100644
--- a/x86_64.c
+++ b/x86_64.c
@@ -5391,7 +5391,8 @@ get_x86_64_frame(struct bt_info *bt, ulong *getpc, ulong *getsp)
static void
x86_64_dump_irq(int irq)
{
- if (symbol_exists("irq_desc") ||
+ if (kernel_symbol_exists("sparse_irqs") ||
+ symbol_exists("irq_desc") ||
kernel_symbol_exists("irq_desc_ptrs") ||
kernel_symbol_exists("irq_desc_tree")) {
machdep->dump_irq = generic_dump_irq;
@@ -5405,7 +5406,8 @@ x86_64_dump_irq(int irq)
static void
x86_64_get_irq_affinity(int irq)
{
- if (symbol_exists("irq_desc") ||
+ if (kernel_symbol_exists("sparse_irqs") ||
+ symbol_exists("irq_desc") ||
kernel_symbol_exists("irq_desc_ptrs") ||
kernel_symbol_exists("irq_desc_tree")) {
machdep->get_irq_affinity = generic_get_irq_affinity;
@@ -5419,7 +5421,8 @@ x86_64_get_irq_affinity(int irq)
static void
x86_64_show_interrupts(int irq, ulong *cpus)
{
- if (symbol_exists("irq_desc") ||
+ if (kernel_symbol_exists("sparse_irqs") ||
+ symbol_exists("irq_desc") ||
kernel_symbol_exists("irq_desc_ptrs") ||
kernel_symbol_exists("irq_desc_tree")) {
machdep->show_interrupts = generic_show_interrupts;
--
2.31.1
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-
HAGIO KAZUHITO(萩尾 一仁) -
lijiang