From: Russell Currey <ruscur@russell.cc>
To: linuxppc-dev@lists.ozlabs.org
Cc: benh@kernel.crashing.org, alistair@popple.id.au, aik@ozlabs.ru,
tpearson@raptorengineering.com,
Russell Currey <ruscur@russell.cc>
Subject: [PATCH 3/3] powerpc/powernv/pci: Track TCE tables in debugfs
Date: Fri, 29 Jun 2018 17:34:37 +1000 [thread overview]
Message-ID: <20180629073437.4060-4-ruscur@russell.cc> (raw)
In-Reply-To: <20180629073437.4060-1-ruscur@russell.cc>
Add a new debugfs entry to trigger dumping out the TCEs for a
given PE using pseudo-bypass, for example PE 0x4 of PHB 2:
echo 0x4 > /sys/kernel/debug/powerpc/PCI0002/dump_tces
This will result in the table being dumped out in dmesg.
Signed-off-by: Russell Currey <ruscur@russell.cc>
---
arch/powerpc/platforms/powernv/pci-ioda.c | 34 +++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index d2ca214610fd..91316d3c26dc 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -3314,6 +3314,38 @@ 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_dump_tces_set(void *data, u64 val)
+{
+ struct pci_controller *hose;
+ struct pnv_ioda_pe *pe;
+ struct pnv_phb *phb;
+ 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)
+ return -EIO;
+
+ for (i = 0; i < pe->tce_count; i++) {
+ if (i > 16 && pe->tces[i] == 0)
+ break;
+ pr_info("TCE %3d: %016llx\n", i, be64_to_cpu(pe->tces[i]));
+ }
+ return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(pnv_pci_dump_tces_fops, NULL,
+ pnv_pci_dump_tces_set, "%llu\n");
+
+
#endif /* CONFIG_DEBUG_FS */
static void pnv_pci_ioda_create_dbgfs(void)
@@ -3339,6 +3371,8 @@ 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("dump_tces", 0200, phb->dbgfs, hose,
+ &pnv_pci_dump_tces_fops);
}
#endif /* CONFIG_DEBUG_FS */
}
--
2.17.1
prev parent reply other threads:[~2018-06-29 7:34 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-29 7:34 [PATCH 0/3] PCI DMA pseudo-bypass for powernv Russell Currey
2018-06-29 7:34 ` [PATCH 1/3] powerpc/powernv/pci: Track largest available TCE order per PHB Russell Currey
2018-07-02 7:32 ` Alexey Kardashevskiy
2018-07-02 7:34 ` Alexey Kardashevskiy
2018-07-03 5:49 ` Russell Currey
2018-06-29 7:34 ` [PATCH 2/3] powerpc/powernv: DMA operations for discontiguous allocation Russell Currey
2018-06-30 2:52 ` Benjamin Herrenschmidt
2018-07-02 8:47 ` Alexey Kardashevskiy
2018-07-03 6:09 ` Russell Currey
2018-07-04 6:12 ` Russell Currey
2018-06-29 7:34 ` Russell Currey [this message]
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