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Date: Fri, 23 May 2008 12:48:54 -0700
From: Yinghai Lu <yhlu.kernel@...il.com>
To: Ingo Molnar <mingo@...e.hu>,
Jesse Barnes <jbarnes@...tuousgeek.org>,
"H. Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>,
Andrew Morton <akpm@...ux-foundation.org>,
Grant Grundler <grundler@...isc-linux.org>
Cc: linux-pci@...r.kernel.org,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: early dump pci conf space v3
so we can printout pci config before kernel touch it
v3: change to pci=early_config_dump
Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
Index: linux-2.6/arch/x86/kernel/setup_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/setup_64.c
+++ linux-2.6/arch/x86/kernel/setup_64.c
@@ -350,6 +350,11 @@ void __init setup_arch(char **cmdline_p)
parse_early_param();
+#ifdef CONFIG_PCI
+ if (pci_early_config_dump)
+ early_dump_pci_devices();
+#endif
+
#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
if (init_ohci1394_dma_early)
init_ohci1394_dma_on_all_controllers();
Index: linux-2.6/arch/x86/pci/common.c
===================================================================
--- linux-2.6.orig/arch/x86/pci/common.c
+++ linux-2.6/arch/x86/pci/common.c
@@ -20,6 +20,7 @@
unsigned int pci_probe = PCI_PROBE_BIOS | PCI_PROBE_CONF1 | PCI_PROBE_CONF2 |
PCI_PROBE_MMCONF;
+unsigned int pci_early_config_dump;
static int pci_bf_sort;
int pci_routeirq;
int pcibios_last_bus = -1;
@@ -489,6 +490,9 @@ char * __devinit pcibios_setup(char *st
} else if (!strcmp(str, "use_crs")) {
pci_probe |= PCI_USE__CRS;
return NULL;
+ } else if (!strcmp(str, "early_config_dump")) {
+ pci_early_config_dump = 1;
+ return NULL;
} else if (!strcmp(str, "routeirq")) {
pci_routeirq = 1;
return NULL;
Index: linux-2.6/arch/x86/pci/early.c
===================================================================
--- linux-2.6.orig/arch/x86/pci/early.c
+++ linux-2.6/arch/x86/pci/early.c
@@ -57,3 +57,57 @@ int early_pci_allowed(void)
return (pci_probe & (PCI_PROBE_CONF1|PCI_PROBE_NOEARLY)) ==
PCI_PROBE_CONF1;
}
+
+void early_dump_pci_device(u8 bus, u8 slot, u8 func)
+{
+ int i;
+ int j;
+ u32 val;
+
+ if (!early_pci_allowed())
+ return;
+
+ printk("PCI: %02x:%02x:%02x", bus, slot, func);
+
+ for (i = 0; i < 256; i += 4) {
+ if (!(i & 0x0f))
+ printk("\n%04x:",i);
+
+ val = read_pci_config(bus, slot, func, i);
+ for (j = 0; j < 4; j++) {
+ printk(" %02x", val & 0xff);
+ val >>= 8;
+ }
+ }
+ printk("\n");
+}
+
+void early_dump_pci_devices(void)
+{
+ unsigned bus, slot, func;
+
+ if (!early_pci_allowed())
+ return;
+
+ for (bus = 0; bus < 256; bus++) {
+ for (slot = 0; slot < 32; slot++) {
+ for (func = 0; func < 8; func++) {
+ u32 class;
+ u8 type;
+ class = read_pci_config(bus, slot, func,
+ PCI_CLASS_REVISION);
+ if (class == 0xffffffff)
+ break;
+
+ early_dump_pci_device(bus, slot, func);
+
+ /* No multi-function device? */
+ type = read_pci_config_byte(bus, slot, func,
+ PCI_HEADER_TYPE);
+ if (!(type & 0x80))
+ break;
+ }
+ }
+ }
+}
+
Index: linux-2.6/include/asm-x86/pci-direct.h
===================================================================
--- linux-2.6.orig/include/asm-x86/pci-direct.h
+++ linux-2.6/include/asm-x86/pci-direct.h
@@ -14,4 +14,7 @@ extern void write_pci_config_byte(u8 bus
extern int early_pci_allowed(void);
+extern unsigned int pci_early_config_dump;
+extern void early_dump_pci_device(u8 bus, u8 slot, u8 func);
+extern void early_dump_pci_devices(void);
#endif
Index: linux-2.6/Documentation/kernel-parameters.txt
===================================================================
--- linux-2.6.orig/Documentation/kernel-parameters.txt
+++ linux-2.6/Documentation/kernel-parameters.txt
@@ -1570,6 +1570,8 @@ and is between 256 and 4096 characters.
cbmemsize=nn[KMG] The fixed amount of bus space which is
reserved for the CardBus bridge's memory
window. The default value is 64 megabytes.
+ early_config_dump [X86] print out pci config space
+ registers early before kernel touch any
pcmv= [HW,PCMCIA] BadgePAD 4
Index: linux-2.6/arch/x86/kernel/setup_32.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/setup_32.c
+++ linux-2.6/arch/x86/kernel/setup_32.c
@@ -46,6 +46,7 @@
#include <linux/dmi.h>
#include <linux/pfn.h>
#include <linux/pci.h>
+#include <asm/pci-direct.h>
#include <linux/init_ohci1394_dma.h>
#include <linux/kvm_para.h>
@@ -692,6 +693,11 @@ void __init setup_arch(char **cmdline_p)
parse_early_param();
+#ifdef CONFIG_PCI
+ if (pci_early_config_dump)
+ early_dump_pci_devices();
+#endif
+
finish_e820_parsing();
strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
--
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