[PATCH 3/7] powerpc/eeh_cache: Add a way to dump the EEH address cache
From: Oliver O'Halloran <oohall@gmail.com>
Date: 2019-02-08 03:13:20
Subsystem:
linux for powerpc (32-bit and 64-bit), pci enhanced error handling (eeh) for powerpc, the rest · Maintainers:
Madhavan Srinivasan, Mahesh J Salgaonkar, Linus Torvalds
Adds a debugfs file that can be read to view the contents of the EEH address cache. This is pretty similar to the existing eeh_addr_cache_print() function, but that function is intended to debug issues inside of the kernel since it's #ifdef`ed out by default, and writes into the kernel log. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> --- arch/powerpc/include/asm/eeh.h | 3 +++ arch/powerpc/kernel/eeh.c | 2 +- arch/powerpc/kernel/eeh_cache.c | 34 +++++++++++++++++++++++++++++---- 3 files changed, 34 insertions(+), 5 deletions(-)
diff --git a/arch/powerpc/include/asm/eeh.h b/arch/powerpc/include/asm/eeh.h
index c003628441cc..fc21b6e78e91 100644
--- a/arch/powerpc/include/asm/eeh.h
+++ b/arch/powerpc/include/asm/eeh.h@@ -460,6 +460,9 @@ static inline void eeh_readsl(const volatile void __iomem *addr, void * buf, eeh_check_failure(addr); } + +void eeh_cache_debugfs_init(void); + #endif /* CONFIG_PPC64 */ #endif /* __KERNEL__ */ #endif /* _POWERPC_EEH_H */
diff --git a/arch/powerpc/kernel/eeh.c b/arch/powerpc/kernel/eeh.c
index f6e65375a8de..d1f0bdf41fac 100644
--- a/arch/powerpc/kernel/eeh.c
+++ b/arch/powerpc/kernel/eeh.c@@ -1810,7 +1810,7 @@ static int __init eeh_init_proc(void) &eeh_enable_dbgfs_ops); debugfs_create_u32("eeh_max_freezes", 0600, powerpc_debugfs_root, &eeh_max_freezes); -#endif + eeh_cache_debugfs_init(); } return 0;
diff --git a/arch/powerpc/kernel/eeh_cache.c b/arch/powerpc/kernel/eeh_cache.c
index b2c320e0fcef..dba421a577e7 100644
--- a/arch/powerpc/kernel/eeh_cache.c
+++ b/arch/powerpc/kernel/eeh_cache.c@@ -26,6 +26,7 @@ #include <linux/spinlock.h> #include <linux/atomic.h> #include <asm/pci-bridge.h> +#include <asm/debugfs.h> #include <asm/ppc-pci.h>
@@ -298,9 +299,34 @@ void eeh_addr_cache_build(void) eeh_addr_cache_insert_dev(dev); eeh_sysfs_add_device(dev); } +} -#ifdef DEBUG - /* Verify tree built up above, echo back the list of addrs. */ - eeh_addr_cache_print(&pci_io_addr_cache_root); -#endif +static int eeh_addr_cache_show(struct seq_file *s, void *v) +{ + struct rb_node *n = rb_first(&pci_io_addr_cache_root.rb_root); + struct pci_io_addr_range *piar; + int cnt = 0; + + spin_lock(&pci_io_addr_cache_root.piar_lock); + while (n) { + piar = rb_entry(n, struct pci_io_addr_range, rb_node); + + seq_printf(s, "%s addr range %3d [%pap-%pap]: %s\n", + (piar->flags & IORESOURCE_IO) ? "i/o" : "mem", cnt, + &piar->addr_lo, &piar->addr_hi, pci_name(piar->pcidev)); + + n = rb_next(n); + cnt++; + } + spin_unlock(&pci_io_addr_cache_root.piar_lock); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(eeh_addr_cache); + +void eeh_cache_debugfs_init(void) +{ + debugfs_create_file_unsafe("eeh_address_cache", 0400, + powerpc_debugfs_root, NULL, + &eeh_addr_cache_fops); }
--
2.20.1