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[PATCH 2/9] util/vfio-helpers: Trace PCI I/O config accesses
From: |
Philippe Mathieu-Daudé |
Subject: |
[PATCH 2/9] util/vfio-helpers: Trace PCI I/O config accesses |
Date: |
Wed, 14 Oct 2020 13:52:46 +0200 |
We sometime get kernel panic with some devices on Aarch64
hosts. Alex Williamson suggests it might be broken PCIe
root complex. Add trace event to record the latest I/O
access before crashing. In case, assert our accesses are
aligned.
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
Cc: Alex Williamson <alex.williamson@redhat.com>
---
util/vfio-helpers.c | 8 ++++++++
util/trace-events | 2 ++
2 files changed, 10 insertions(+)
diff --git a/util/vfio-helpers.c b/util/vfio-helpers.c
index 14a549510fe..1d4efafcaa4 100644
--- a/util/vfio-helpers.c
+++ b/util/vfio-helpers.c
@@ -227,6 +227,10 @@ static int qemu_vfio_pci_read_config(QEMUVFIOState *s,
void *buf,
{
int ret;
+ trace_qemu_vfio_pci_read_config(buf, ofs, size,
+ s->config_region_info.offset,
+ s->config_region_info.size);
+ assert(QEMU_IS_ALIGNED(s->config_region_info.offset + ofs, size));
do {
ret = pread(s->device, buf, size, s->config_region_info.offset + ofs);
} while (ret == -1 && errno == EINTR);
@@ -237,6 +241,10 @@ static int qemu_vfio_pci_write_config(QEMUVFIOState *s,
void *buf, int size, int
{
int ret;
+ trace_qemu_vfio_pci_write_config(buf, ofs, size,
+ s->config_region_info.offset,
+ s->config_region_info.size);
+ assert(QEMU_IS_ALIGNED(s->config_region_info.offset + ofs, size));
do {
ret = pwrite(s->device, buf, size, s->config_region_info.offset + ofs);
} while (ret == -1 && errno == EINTR);
diff --git a/util/trace-events b/util/trace-events
index 24c31803b01..c048f85f828 100644
--- a/util/trace-events
+++ b/util/trace-events
@@ -85,3 +85,5 @@ qemu_vfio_new_mapping(void *s, void *host, size_t size, int
index, uint64_t iova
qemu_vfio_do_mapping(void *s, void *host, size_t size, uint64_t iova) "s %p
host %p size 0x%zx iova 0x%"PRIx64
qemu_vfio_dma_map(void *s, void *host, size_t size, bool temporary, uint64_t
*iova) "s %p host %p size 0x%zx temporary %d iova %p"
qemu_vfio_dma_unmap(void *s, void *host) "s %p host %p"
+qemu_vfio_pci_read_config(void *buf, int ofs, int size, uint64_t region_ofs,
uint64_t region_size) "read cfg ptr %p ofs 0x%x size %d (region ofs 0x%"PRIx64"
size %"PRId64")"
+qemu_vfio_pci_write_config(void *buf, int ofs, int size, uint64_t region_ofs,
uint64_t region_size) "write cfg ptr %p ofs 0x%x size %d (region ofs
0x%"PRIx64" size %"PRId64")"
--
2.26.2
- [PATCH 0/9] util/vfio-helpers: Improve debugging experience, Philippe Mathieu-Daudé, 2020/10/14
- [PATCH 1/9] util/vfio-helpers: Improve reporting unsupported IOMMU type, Philippe Mathieu-Daudé, 2020/10/14
- [PATCH 2/9] util/vfio-helpers: Trace PCI I/O config accesses,
Philippe Mathieu-Daudé <=
- [PATCH 3/9] util/vfio-helpers: Trace PCI BAR region info, Philippe Mathieu-Daudé, 2020/10/14
- [PATCH 4/9] util/vfio-helpers: Trace where BARs are mapped, Philippe Mathieu-Daudé, 2020/10/14
- [PATCH 6/9] util/vfio-helpers: Convert vfio_dump_mapping to trace events, Philippe Mathieu-Daudé, 2020/10/14
- [PATCH 7/9] util/vfio-helpers: Let qemu_vfio_dma_map() propagate Error, Philippe Mathieu-Daudé, 2020/10/14
- [PATCH 8/9] util/vfio-helpers: Let qemu_vfio_do_mapping() propagate Error, Philippe Mathieu-Daudé, 2020/10/14
- [PATCH 9/9] util/vfio-helpers: Let qemu_vfio_verify_mappings() use error_report(), Philippe Mathieu-Daudé, 2020/10/14
- [PATCH 5/9] util/vfio-helpers: Improve DMA trace events, Philippe Mathieu-Daudé, 2020/10/14
- Re: [PATCH 0/9] util/vfio-helpers: Improve debugging experience, Fam Zheng, 2020/10/14