Commit 5ca85ae6 authored by Oliver O'Halloran's avatar Oliver O'Halloran Committed by Michael Ellerman
Browse files

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: default avatarOliver O'Halloran <oohall@gmail.com>
Reviewed-by: default avatarSam Bobroff <sbobroff@linux.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent e67fbbec

arch/powerpc/include/asm/eeh.h

+3 −0
Original line number Diff line number Diff line
@@ -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 */

arch/powerpc/kernel/eeh.c

+1 −0
Original line number Diff line number Diff line
@@ -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

	}

arch/powerpc/kernel/eeh_cache.c

+26 −4
Original line number Diff line number Diff line
@@ -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);

}

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