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KERN_PCI
KERN_ACPI
v4: fix some checkpatch error and warning
v5: add default with DEFINE_LOGLEVE_SETUP_DEF
KERN_APIC
usage:
in .h to have
#define KERN_PCI "<pci>"
in .c to have
DEFINE_LOGLEVEL_SETUP(pci, KERN_PCI, "pci:");
then could use
printk(KERN_DEBUG KERN_PCI fmt, ...);
and command line
loglevel=3,pci:8
you can add different printk to different files of one subsys if you like
not just one susbsys one tag, and don't need to update kernel.h to add more tags
YH
--
so could make subsys easy to add loglevel and xxx_printk v2: make it more genric, so subsys user only need to two line macro v3: add back nameStr, so could find out iommu: and iommu_gart: and etc v4: use printk intead of pci_printk v5: fix checkpatch error and warning v6: add DEFINE_LOGLEVEL_SETUP_DEF to take default usage: in .h to have #define KERN_PCI "<pci>" in .c to have DEFINE_LOGLEVEL_SETUP(pci, KERN_PCI, "pci:"); then could use printk(KERN_DEBUG KERN_PCI fmt, ...); and command line loglevel=pci:8 you can add different printk to different files of one subsys if you like Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> --- arch/x86/kernel/vmlinux_32.lds.S | 1 arch/x86/kernel/vmlinux_64.lds.S | 2 include/asm-generic/vmlinux.lds.h | 8 +++ include/linux/init.h | 22 ++++++++++ include/linux/kernel.h | 9 ++++ init/main.c | 77 +++++++++++++++++++++++++++++++++++++- kernel/printk.c | 28 +++++++++++-- 7 files changed, 142 insertions(+), 5 deletions(-) Index: linux-2.6/arch/x86/kernel/vmlinux_32.lds.S =================================================================== --- linux-2.6.orig/arch/x86/kernel/vmlinux_32.lds.S +++ linux-2.6/arch/x86/kernel/vmlinux_32.lds.S @@ -145,6 +145,7 @@ SECTIONS *(.x86_cpu_dev.init) __x86_cpu_dev_end = .; } + LOGLEVEL_SETUP_INIT(8) DYN_ARRAY_INIT(8) SECURITY_INIT . = ALIGN(4); Index: linux-2.6/arch/x86/kernel/vmlinux_64.lds.S =================================================================== --- linux-2.6.orig/arch/x86/kernel/vmlinux_64.lds.S +++ linux-2.6/arch/x86/kernel/vmlinux_64.lds.S @@ -174,6 +174,8 @@ SECTIONS } __x86_cpu_dev_end = .; + LOGLEVEL_SETUP_INIT(8) + DYN_ARRAY_INIT(8) SECURITY_INIT Index: linux-2.6/include/asm-generic/vmlinux.lds.h =================================================================== --- linux-2.6.orig/include/asm-generic/vmlinux.lds.h +++ ...
use DEFINE_LOGLEVEL_SETUP to set loglevel for pci
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
---
drivers/pci/pci.c | 2 ++
include/linux/pci.h | 2 ++
2 files changed, 4 insertions(+)
Index: linux-2.6/drivers/pci/pci.c
===================================================================
--- linux-2.6.orig/drivers/pci/pci.c
+++ linux-2.6/drivers/pci/pci.c
@@ -1953,6 +1953,8 @@ static int __devinit pci_setup(char *str
}
early_param("pci", pci_setup);
+DEFINE_LOGLEVEL_SETUP(pci, KERN_PCI, "pci:");
+
device_initcall_sync(pci_init);
EXPORT_SYMBOL(pci_reenable_device);
Index: linux-2.6/include/linux/pci.h
===================================================================
--- linux-2.6.orig/include/linux/pci.h
+++ linux-2.6/include/linux/pci.h
@@ -55,6 +55,8 @@
/* Include the ID list */
#include <linux/pci_ids.h>
+#define KERN_PCI "<pci>"
+
/* pci_slot represents a physical slot */
struct pci_slot {
struct pci_bus *bus; /* The bus this slot is on */
--
v2: use printk(KERN_DEBUG KERN_PCI ...
v3: fix checkpatch error and warning
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
---
drivers/pci/probe.c | 28 +++++++++++++++++-----------
1 file changed, 17 insertions(+), 11 deletions(-)
Index: linux-2.6/drivers/pci/probe.c
===================================================================
--- linux-2.6.orig/drivers/pci/probe.c
+++ linux-2.6/drivers/pci/probe.c
@@ -304,7 +304,8 @@ static int __pci_read_base(struct pci_de
} else {
res->start = l64;
res->end = l64 + sz64;
- printk(KERN_DEBUG "PCI: %s reg %x 64bit mmio: [%llx, %llx]\n",
+ printk(KERN_DEBUG KERN_PCI
+ "PCI: %s reg %x 64bit mmio: [%llx, %llx]\n",
pci_name(dev), pos, res->start, res->end);
}
} else {
@@ -315,9 +316,10 @@ static int __pci_read_base(struct pci_de
res->start = l;
res->end = l + sz;
- printk(KERN_DEBUG "PCI: %s reg %x %s: [%llx, %llx]\n", pci_name(dev),
- pos, (res->flags & IORESOURCE_IO) ? "io port":"32bit mmio",
- res->start, res->end);
+ printk(KERN_DEBUG KERN_PCI "PCI: %s reg %x %s: [%llx, %llx]\n",
+ pci_name(dev), pos,
+ (res->flags & IORESOURCE_IO) ? "io port" : "32bit mmio",
+ res->start, res->end);
}
out:
@@ -388,8 +390,9 @@ void __devinit pci_read_bridge_bases(str
res->start = base;
if (!res->end)
res->end = limit + 0xfff;
- printk(KERN_DEBUG "PCI: bridge %s io port: [%llx, %llx]\n",
- pci_name(dev), res->start, res->end);
+ printk(KERN_DEBUG KERN_PCI
+ "PCI: bridge %s io port: [%llx, %llx]\n",
+ pci_name(dev), res->start, res->end);
}
res = child->resource[1];
@@ -401,8 +404,9 @@ void __devinit pci_read_bridge_bases(str
res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
res->start = base;
res->end = limit + 0xfffff;
- printk(KERN_DEBUG "PCI: bridge %s 32bit mmio: [%llx, %llx]\n",
- pci_name(dev), res->start, res->end);
+ printk(KERN_DEBUG KERN_PCI
+ "PCI: bridge %s 32bit mmio: [%llx, ...use DEFINE_LOGLEVEL_SETUP to set loglevel for acpi
v2: use <acpi, "acpi:"> instead
v3: use KERN_ACPI
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
---
drivers/acpi/osl.c | 2 ++
include/linux/acpi.h | 1 +
2 files changed, 3 insertions(+)
Index: linux-2.6/drivers/acpi/osl.c
===================================================================
--- linux-2.6.orig/drivers/acpi/osl.c
+++ linux-2.6/drivers/acpi/osl.c
@@ -75,6 +75,8 @@ EXPORT_SYMBOL(acpi_in_debugger);
extern char line_buf[80];
#endif /*ENABLE_DEBUGGER */
+DEFINE_LOGLEVEL_SETUP(acpi, KERN_ACPI, "acpi:");
+
static unsigned int acpi_irq_irq;
static acpi_osd_handler acpi_irq_handler;
static void *acpi_irq_context;
Index: linux-2.6/include/linux/acpi.h
===================================================================
--- linux-2.6.orig/include/linux/acpi.h
+++ linux-2.6/include/linux/acpi.h
@@ -43,6 +43,7 @@
#include <asm/acpi.h>
#include <linux/dmi.h>
+#define KERN_ACPI "<acpi>"
enum acpi_irq_model_id {
ACPI_IRQ_MODEL_PIC = 0,
--
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
---
drivers/acpi/numa.c | 9 +++++++++
1 file changed, 9 insertions(+)
Index: linux-2.6/drivers/acpi/numa.c
===================================================================
--- linux-2.6.orig/drivers/acpi/numa.c
+++ linux-2.6/drivers/acpi/numa.c
@@ -150,6 +150,15 @@ static __init int slit_valid(struct acpi
{
int i, j;
int d = slit->locality_count;
+ printk(KERN_DEBUG KERN_ACPI "ACPI: SLIT: nodes = %d\n", d);
+ for (i = 0; i < d; i++) {
+ printk(KERN_DEBUG KERN_ACPI " ");
+ for (j = 0; j < d; j++) {
+ u8 val = slit->entry[d*i + j];
+ printk(KERN_CONT KERN_ACPI " %d", val);
+ }
+ printk(KERN_CONT KERN_ACPI "\n");
+ }
for (i = 0; i < d; i++) {
for (j = 0; j < d; j++) {
u8 val = slit->entry[d*i + j];
--
and kill apic_printk
using loglevel=apic:8 intead
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
---
Documentation/kernel-parameters.txt | 6
arch/x86/kernel/apic.c | 108 +++++-------
arch/x86/kernel/io_apic.c | 235 +++++++++++++---------------
arch/x86/kernel/mpparse.c | 10 -
arch/x86/kernel/smpboot.c | 11 -
include/asm-x86/apic.h | 20 --
include/asm-x86/es7000/wakecpu.h | 6
include/asm-x86/mach-default/mach_wakecpu.h | 6
8 files changed, 178 insertions(+), 224 deletions(-)
Index: linux-2.6/Documentation/kernel-parameters.txt
===================================================================
--- linux-2.6.orig/Documentation/kernel-parameters.txt
+++ linux-2.6/Documentation/kernel-parameters.txt
@@ -306,12 +306,6 @@ and is between 256 and 4096 characters.
not play well with APC CPU idle - disable it if you have
APC and your system crashes randomly.
- apic= [APIC,i386] Advanced Programmable Interrupt Controller
- Change the output verbosity whilst booting
- Format: { quiet (default) | verbose | debug }
- Change the amount of debugging information output
- when initialising the APIC and IO-APIC components.
-
apm= [APM] Advanced Power Management
See header of arch/x86/kernel/apm_32.c.
Index: linux-2.6/arch/x86/kernel/apic.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/apic.c
+++ linux-2.6/arch/x86/kernel/apic.c
@@ -58,6 +58,8 @@
# error SPURIOUS_APIC_VECTOR definition error
#endif
+DEFINE_LOGLEVEL_SETUP_DEF(apic, KERN_APIC, "apic:", 6);
+
#ifdef CONFIG_X86_32
/*
* Knob to control our willingness to enable the local APIC.
@@ -123,8 +125,6 @@ char system_vectors[NR_VECTORS] = { [0 .
/*
* Debug level, exported for io_apic.c
*/
-unsigned int apic_verbosity;
-
int pic_mode;
/* Have we found an MP table */
@@ -549,7 ...I think all of this is overdesigned and stupid. People expecting that loglevels are exactly right so they can calm messages are like security-savvy people who expect all security relevant bugfixes carry CVE tag. grep says there are 50757 printk calls, only 32129 of them carry KERN_ tag. Oh, and new and improved logs: [ 0.340326] pci 0000:00:01.0: PME# supported from D0 D3hot D3cold [ 0.340326] pci 0000:00:01.0: PME# disabled [ 0.340326] <pci>PCI: 0000:00:1a.0 reg 20 io port: [dc00, dc1f] [ 0.340413] <pci>PCI: 0000:00:1a.1 reg 20 io port: [e000, e01f] [ 0.340549] <pci>PCI: 0000:00:1a.7 reg 10 32bit mmio: [febffc00, febfffff] ^^^^^^^^^ How this can be an improvement for those who boot with ignore_loglevel, I don't know. --
the subsystem tags should be cut out by dmesg by default, just like the normal <1> tags are cut out. about your general point: it's valid observations. The idea would be to end this never ending unstable conflict of people adding printks for debug reasons versus people removing printks who'd like to have a nice looking bootup log. Both point of views are correct in different usecases - and IMO the best solution is the consolidation hpa suggested and what Yinghai is working towards: to replace all the current ad-hoc debug printouts (with different switchlets strewn all across the kernel) with an ASCII based generic printk facility and a generic boot line option. people adding printks without any KERN_ tag is fine - this facility is only interesting to subsystems who'd like to make use of it. (core code, ec. - the items that have a disproportionate weight in terms of system stability, and which thus have a disproportionate need to stay debuggable and regression-free) [ and we also need a dynamic facility to change the filters via debugfs btw - it should be possible to modify these printk filters after bootup, runtime. Many subsystems have debug printks that make sense to enable/disable after the system has booted up. ] and it's bad and a showstopper if the default output of 'dmesg' degrades, like your noticed - those are bugs in the concept and need to be fixed. Ingo --
Simply nice looking log is irrational. I can understand if by default messages do not fit into printk buffer before userspace can save them. This is indeed harmful and loses information. OTOH, all these loglevel games ultimately lead to missed messages (by design). I remember myself wasting time debugging wrong path simply because box wasn't booted with ignore_loglevel and critical debugging printk wasn't on serial console, but only in dmesg. So, in some cases useless information will not be shown, but in some --
yes, i had that happen too, and i am quite sure that the most sensible way out is to provide a _single_ point for users to enable 'all things debug'. I.e. a "loglevel=debug" (or loglevel=all) boot parameter. Instead of the current list of zillions of ad-hoc switchlets that are scattered all around the kernel. Tell me, within 10 seconds, which one of these are the correct options and which ones are typos: lapic lapic=verbose apic=debug ignore-loglevel initcalldebug early_printk=vga ignoreloglevel debug verbose ignore_loglevel initcall_debug apic=verbose initcall=debug earlyprintk=vga (i'm willing to bet a good beer that you probably have not found the right solution in time :-) People dont really want to individually enable pci or apic or smp debugging or whatnot - when it's about boot debugging they (and we) just want something really verbose. (_Sometimes_ we want more accurate filters for runtime debugging, especially if something can produce a log of continuing printks during userspace bootup - but that is an afterthought IMO.) with such a facility in place we could just hide all non-essential messages by default, and have the perpetual possibility to get a verbose bootup without users having to rebuild their (often distro-built) kernel. The only ongoing work would be to occasionally convert a stray informational printk that seemed to be useful during early development to a subsystem printk that hides it by default. The printk is not actually _lost_ and is utmost trivial to activate it again, should the need arise - which loss is why the "get rid of printks" patches are opposed most of the time. So i think we'll hit multiple birds with the same stone. Ingo --
v6 should fix the problem, to support several seperate loglevel. YH --
It's probably worth pointing out that we had similar transition pains when we introduced the loglevel tags. If you used an old dmesg/klogd you got the loglevel tags; we cleaned them up. -hpa --
want to expand loglevel tags to two digi bits, hope the dmesg/klogd could handle it. YH --
I doubt they'd be written to handle that already. -hpa --
dmesg util in opensuse 10.3 does support two digi bits loglevel tags. YH --
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