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powerpc/eeh_cache: Add a way to dump the EEH address cache 

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>
Reviewed-by: Sam Bobroff <sbobroff@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Oliver O'Halloran 2019-02-15 11:48:13 +11:00 committed by Michael Ellerman
parent e67fbbec74
commit 5ca85ae631
3 changed files with 31 additions and 5 deletions
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3
arch/powerpc/include/asm/eeh.h
View File

@ -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 */

1
arch/powerpc/kernel/eeh.c
View File

@ -1843,6 +1843,7 @@ static int __init eeh_init_proc(void)
&eeh_enable_dbgfs_ops);
debugfs_create_u32("eeh_max_freezes", 0600,
powerpc_debugfs_root, &eeh_max_freezes);
eeh_cache_debugfs_init();
#endif
}

32
arch/powerpc/kernel/eeh_cache.c
View File

@ -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 +299,30 @@ 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 pci_io_addr_range *piar;
struct rb_node *n;
spin_lock(&pci_io_addr_cache_root.piar_lock);
for (n = rb_first(&pci_io_addr_cache_root.rb_root); n; n = rb_next(n)) {
piar = rb_entry(n, struct pci_io_addr_range, rb_node);
seq_printf(s, "%s addr range [%pap-%pap]: %s\n",
(piar->flags & IORESOURCE_IO) ? "i/o" : "mem",
&piar->addr_lo, &piar->addr_hi, pci_name(piar->pcidev));
}
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);
}