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authorRussell Currey <ruscur@russell.cc>2018-06-06 13:36:06 +1000
committerTimothy Pearson <tpearson@raptorengineering.com>2018-06-22 01:05:17 -0500
commit6e58b78b283e1f4e981d8ee1c1e0f1c8debb22f7 (patch)
treed534b796e0fdf625a3a7f6ad3202eb74126c4180
parent23556da90284f603bbb1de3f8ff624104a2c16f7 (diff)
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powerpc/powernv/pci: Track DMA and TCE tables in debugfs
Add a new debugfs entry to trigger dumping out the tracking table and TCEs for a given PE, for example PE 0x4 of PHB 2: echo 0x4 > /sys/kernel/debug/powerpc/PCI0002/sketchy This will result in the table being dumped out in dmesg. Signed-off-by: Russell Currey <ruscur@russell.cc>
-rw-r--r--arch/powerpc/platforms/powernv/pci-ioda.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 7ecc186..55f0f7b 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -3342,6 +3342,47 @@ static int pnv_pci_diag_data_set(void *data, u64 val)
DEFINE_SIMPLE_ATTRIBUTE(pnv_pci_diag_data_fops, NULL,
pnv_pci_diag_data_set, "%llu\n");
+static int pnv_pci_sketchy_set(void *data, u64 val)
+{
+ struct pci_controller *hose;
+ struct pnv_ioda_pe *pe;
+ struct pnv_phb *phb;
+ u64 entry1, entry2;
+ int i;
+
+ hose = (struct pci_controller *)data;
+ if (!hose || !hose->private_data)
+ return -ENODEV;
+
+ phb = hose->private_data;
+ pe = &phb->ioda.pe_array[val];
+
+ if (!pe)
+ return -EINVAL;
+
+ if (!pe->tces || !pe->tce_tracker)
+ return -EIO;
+
+ for (i = 0; i < pe->tce_count; i++) {
+ if (i > 16 && pe->tces[i] == 0)
+ break;
+ pr_info("%3d: %016llx\n", i, be64_to_cpu(pe->tces[i]));
+ }
+
+ for (i = 0; i < pe->tce_count; i++) {
+ entry1 = pe->tce_tracker[i * 2];
+ entry2 = pe->tce_tracker[i * 2 + 1];
+ if (!entry1)
+ break;
+ pr_info("%3d: %016llx %016llx\n", i, entry1, entry2);
+ }
+ return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(pnv_pci_sketchy_fops, NULL,
+ pnv_pci_sketchy_set, "%llu\n");
+
+
#endif /* CONFIG_DEBUG_FS */
static void pnv_pci_ioda_create_dbgfs(void)
@@ -3367,6 +3408,8 @@ static void pnv_pci_ioda_create_dbgfs(void)
debugfs_create_file("dump_diag_regs", 0200, phb->dbgfs, hose,
&pnv_pci_diag_data_fops);
+ debugfs_create_file("sketchy", 0200, phb->dbgfs, hose,
+ &pnv_pci_sketchy_fops);
}
#endif /* CONFIG_DEBUG_FS */
}
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