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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>
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parent
e67fbbec74
commit
5ca85ae631
3 changed files with 31 additions and 5 deletions
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@ -460,6 +460,9 @@ static inline void eeh_readsl(const volatile void __iomem *addr, void * buf,
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eeh_check_failure(addr);
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}
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void eeh_cache_debugfs_init(void);
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#endif /* CONFIG_PPC64 */
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#endif /* __KERNEL__ */
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#endif /* _POWERPC_EEH_H */
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@ -1843,6 +1843,7 @@ static int __init eeh_init_proc(void)
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&eeh_enable_dbgfs_ops);
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debugfs_create_u32("eeh_max_freezes", 0600,
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powerpc_debugfs_root, &eeh_max_freezes);
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eeh_cache_debugfs_init();
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#endif
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}
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@ -26,6 +26,7 @@
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#include <linux/spinlock.h>
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#include <linux/atomic.h>
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#include <asm/pci-bridge.h>
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#include <asm/debugfs.h>
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#include <asm/ppc-pci.h>
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@ -298,9 +299,30 @@ void eeh_addr_cache_build(void)
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eeh_addr_cache_insert_dev(dev);
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eeh_sysfs_add_device(dev);
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}
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#ifdef DEBUG
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/* Verify tree built up above, echo back the list of addrs. */
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eeh_addr_cache_print(&pci_io_addr_cache_root);
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#endif
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}
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static int eeh_addr_cache_show(struct seq_file *s, void *v)
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{
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struct pci_io_addr_range *piar;
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struct rb_node *n;
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spin_lock(&pci_io_addr_cache_root.piar_lock);
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for (n = rb_first(&pci_io_addr_cache_root.rb_root); n; n = rb_next(n)) {
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piar = rb_entry(n, struct pci_io_addr_range, rb_node);
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seq_printf(s, "%s addr range [%pap-%pap]: %s\n",
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(piar->flags & IORESOURCE_IO) ? "i/o" : "mem",
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&piar->addr_lo, &piar->addr_hi, pci_name(piar->pcidev));
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}
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spin_unlock(&pci_io_addr_cache_root.piar_lock);
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(eeh_addr_cache);
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void eeh_cache_debugfs_init(void)
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{
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debugfs_create_file_unsafe("eeh_address_cache", 0400,
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powerpc_debugfs_root, NULL,
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&eeh_addr_cache_fops);
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}
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