Re: [PATCH V1 32/32] vfio-pci: improved tracing

[Steven Sistare]

On 9/15/2020 2:49 PM, Dr. David Alan Gilbert wrote:
> * Steve Sistare (steven.sistare@oracle.com) wrote:
>> Print more info for existing trace points:
>>   trace_kvm_irqchip_add_msi_route.
>>   trace_pci_update_mappings_del
>>   trace_pci_update_mappings_add
>>
>> Add new trace points:
>>   trace_kvm_irqchip_assign_irqfd
>>   trace_msix_table_mmio_write
>>   trace_vfio_dma_unmap
>>   trace_vfio_dma_map
>>   trace_vfio_region
>>   trace_vfio_descriptors
>>   trace_ram_block_add
>>
>> Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
> 
> Why don't you split this out into a separate patch by itself; if they're
> general extra useful tracing they can just go in.

OK, will submit separately.

> Note that you've also added a new warning in vfio_dma_unmap

I'll move that elsewhere.

- Steve

>> ---
>>  accel/kvm/kvm-all.c    |  8 ++++++--
>>  accel/kvm/trace-events |  3 ++-
>>  exec.c                 |  3 +++
>>  hw/pci/msix.c          |  1 +
>>  hw/pci/pci.c           | 10 ++++++----
>>  hw/pci/trace-events    |  5 +++--
>>  hw/vfio/common.c       | 16 +++++++++++++++-
>>  hw/vfio/pci.c          |  1 +
>>  hw/vfio/trace-events   |  9 ++++++---
>>  trace-events           |  2 ++
>>  10 files changed, 45 insertions(+), 13 deletions(-)
>>
>> diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
>> index 63ef6af..5511ea7 100644
>> --- a/accel/kvm/kvm-all.c
>> +++ b/accel/kvm/kvm-all.c
>> @@ -46,6 +46,7 @@
>>  #include "sysemu/reset.h"
>>  
>>  #include "hw/boards.h"
>> +#include "trace-root.h"
>>  
>>  /* This check must be after config-host.h is included */
>>  #ifdef CONFIG_EVENTFD
>> @@ -1670,7 +1671,7 @@ int kvm_irqchip_add_msi_route(KVMState *s, int vector, 
>> PCIDevice *dev)
>>      }
>>  
>>      trace_kvm_irqchip_add_msi_route(dev ? dev->name : (char *)"N/A",
>> -                                    vector, virq);
>> +                                    vector, virq, msg.address, msg.data);
>>  
>>      kvm_add_routing_entry(s, &kroute);
>>      kvm_arch_add_msi_route_post(&kroute, vector, dev);
>> @@ -1717,6 +1718,7 @@ static int kvm_irqchip_assign_irqfd(KVMState *s, 
>> EventNotifier *event,
>>  {
>>      int fd = event_notifier_get_fd(event);
>>      int rfd = resample ? event_notifier_get_fd(resample) : -1;
>> +    int ret;
>>  
>>      struct kvm_irqfd irqfd = {
>>          .fd = fd,
>> @@ -1758,7 +1760,9 @@ static int kvm_irqchip_assign_irqfd(KVMState *s, 
>> EventNotifier *event,
>>          return -ENOSYS;
>>      }
>>  
>> -    return kvm_vm_ioctl(s, KVM_IRQFD, &irqfd);
>> +    ret = kvm_vm_ioctl(s, KVM_IRQFD, &irqfd);
>> +    trace_kvm_irqchip_assign_irqfd(fd, virq, rfd, ret);
>> +    return ret;
>>  }
>>  
>>  int kvm_irqchip_add_adapter_route(KVMState *s, AdapterInfo *adapter)
>> diff --git a/accel/kvm/trace-events b/accel/kvm/trace-events
>> index a68eb66..67a01e6 100644
>> --- a/accel/kvm/trace-events
>> +++ b/accel/kvm/trace-events
>> @@ -9,7 +9,8 @@ kvm_device_ioctl(int fd, int type, void *arg) "dev fd %d, 
>> type 0x%x, arg %p"
>>  kvm_failed_reg_get(uint64_t id, const char *msg) "Warning: Unable to 
>> retrieve ONEREG %" PRIu64 " from KVM: %s"
>>  kvm_failed_reg_set(uint64_t id, const char *msg) "Warning: Unable to set 
>> ONEREG %" PRIu64 " to KVM: %s"
>>  kvm_irqchip_commit_routes(void) ""
>> -kvm_irqchip_add_msi_route(char *name, int vector, int virq) "dev %s vector 
>> %d virq %d"
>> +kvm_irqchip_add_msi_route(char *name, int vector, int virq, uint64_t addr, 
>> uint32_t data) "%s, vector %d, virq %d, msg {addr 0x%"PRIx64", data 0x%x}"
>> +kvm_irqchip_assign_irqfd(int fd, int virq, int rfd, int status) "(fd=%d, 
>> virq=%d, rfd=%d) KVM_IRQFD returns %d"
>>  kvm_irqchip_update_msi_route(int virq) "Updating MSI route virq=%d"
>>  kvm_irqchip_release_virq(int virq) "virq %d"
>>  kvm_set_ioeventfd_mmio(int fd, uint64_t addr, uint32_t val, bool assign, 
>> uint32_t size, bool datamatch) "fd: %d @0x%" PRIx64 " val=0x%x assign: %d 
>> size: %d match: %d"
>> diff --git a/exec.c b/exec.c
>> index 5473c09..dd99ee0 100644
>> --- a/exec.c
>> +++ b/exec.c
>> @@ -2319,6 +2319,9 @@ static void ram_block_add(RAMBlock *new_block, Error 
>> **errp, bool shared)
>>          }
>>          ram_block_notify_add(new_block->host, new_block->max_length);
>>      }
>> +    trace_ram_block_add(new_block->host, new_block->max_length,
>> +                        memory_region_name(new_block->mr),
>> +                        new_block->mr->readonly ? "ro" : "rw");
>>  }
>>  
>>  #ifdef CONFIG_POSIX
>> diff --git a/hw/pci/msix.c b/hw/pci/msix.c
>> index 67e34f3..65a2882 100644
>> --- a/hw/pci/msix.c
>> +++ b/hw/pci/msix.c
>> @@ -189,6 +189,7 @@ static void msix_table_mmio_write(void *opaque, hwaddr 
>> addr,
>>      int vector = addr / PCI_MSIX_ENTRY_SIZE;
>>      bool was_masked;
>>  
>> +    trace_msix_table_mmio_write(dev->name, addr, val, size);
>>      was_masked = msix_is_masked(dev, vector);
>>      pci_set_long(dev->msix_table + addr, val);
>>      msix_handle_mask_update(dev, vector, was_masked);
>> diff --git a/hw/pci/pci.c b/hw/pci/pci.c
>> index c2e1509..6142411 100644
>> --- a/hw/pci/pci.c
>> +++ b/hw/pci/pci.c
>> @@ -1324,9 +1324,11 @@ void pci_update_mappings(PCIDevice *d)
>>      PCIIORegion *r;
>>      int i;
>>      pcibus_t new_addr;
>> +    const char *name;
>>  
>>      for(i = 0; i < PCI_NUM_REGIONS; i++) {
>>          r = &d->io_regions[i];
>> +        name = r->memory ? r->memory->name : "";
>>  
>>          /* this region isn't registered */
>>          if (!r->size)
>> @@ -1340,18 +1342,18 @@ void pci_update_mappings(PCIDevice *d)
>>  
>>          /* now do the real mapping */
>>          if (r->addr != PCI_BAR_UNMAPPED) {
>> -            trace_pci_update_mappings_del(d, pci_dev_bus_num(d),
>> +            trace_pci_update_mappings_del(d->name, pci_dev_bus_num(d),
>>                                            PCI_SLOT(d->devfn),
>>                                            PCI_FUNC(d->devfn),
>> -                                          i, r->addr, r->size);
>> +                                          i, r->addr, r->size, name);
>>              memory_region_del_subregion(r->address_space, r->memory);
>>          }
>>          r->addr = new_addr;
>>          if (r->addr != PCI_BAR_UNMAPPED) {
>> -            trace_pci_update_mappings_add(d, pci_dev_bus_num(d),
>> +            trace_pci_update_mappings_add(d->name, pci_dev_bus_num(d),
>>                                            PCI_SLOT(d->devfn),
>>                                            PCI_FUNC(d->devfn),
>> -                                          i, r->addr, r->size);
>> +                                          i, r->addr, r->size, name);
>>              memory_region_add_subregion_overlap(r->address_space,
>>                                                  r->addr, r->memory, 1);
>>          }
>> diff --git a/hw/pci/trace-events b/hw/pci/trace-events
>> index def4b39..6dd7015 100644
>> --- a/hw/pci/trace-events
>> +++ b/hw/pci/trace-events
>> @@ -1,8 +1,8 @@
>>  # See docs/devel/tracing.txt for syntax documentation.
>>  
>>  # pci.c
>> -pci_update_mappings_del(void *d, uint32_t bus, uint32_t slot, uint32_t 
>> func, int bar, uint64_t addr, uint64_t size) "d=%p %02x:%02x.%x 
>> %d,0x%"PRIx64"+0x%"PRIx64
>> -pci_update_mappings_add(void *d, uint32_t bus, uint32_t slot, uint32_t 
>> func, int bar, uint64_t addr, uint64_t size) "d=%p %02x:%02x.%x 
>> %d,0x%"PRIx64"+0x%"PRIx64
>> +pci_update_mappings_del(const char *dname, uint32_t bus, uint32_t slot, 
>> uint32_t func, int bar, uint64_t addr, uint64_t size, const char *name) "%s 
>> %02x:%02x.%x [%d] 0x%"PRIx64", 0x%"PRIx64"B \"%s\""
>> +pci_update_mappings_add(const char *dname, uint32_t bus, uint32_t slot, 
>> uint32_t func, int bar, uint64_t addr, uint64_t size, const char *name) "%s 
>> %02x:%02x.%x [%d] 0x%"PRIx64", 0x%"PRIx64"B \"%s\""
>>  
>>  # pci_host.c
>>  pci_cfg_read(const char *dev, unsigned devid, unsigned fnid, unsigned offs, 
>> unsigned val) "%s %02u:%u @0x%x -> 0x%x"
>> @@ -10,3 +10,4 @@ pci_cfg_write(const char *dev, unsigned devid, unsigned 
>> fnid, unsigned offs, uns
>>  
>>  # msix.c
>>  msix_write_config(char *name, bool enabled, bool masked) "dev %s enabled %d 
>> masked %d"
>> +msix_table_mmio_write(char *name, uint64_t addr, uint64_t val, unsigned 
>> size)  "(%s, @%"PRId64", 0x%"PRIx64", %dB)"
>> diff --git a/hw/vfio/common.c b/hw/vfio/common.c
>> index a51a093..23c8bf3 100644
>> --- a/hw/vfio/common.c
>> +++ b/hw/vfio/common.c
>> @@ -304,6 +304,8 @@ static int vfio_dma_unmap(VFIOContainer *container,
>>          return 0;
>>      }
>>  
>> +    trace_vfio_dma_unmap(container->fd, iova, size);
>> +
>>      while (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
>>          /*
>>           * The type1 backend has an off-by-one bug in the kernel 
>> (71a7d3d78e3c
>> @@ -327,6 +329,11 @@ static int vfio_dma_unmap(VFIOContainer *container,
>>          return -errno;
>>      }
>>  
>> +    if (unmap.size != size) {
>> +        error_printf("warn: VFIO_UNMAP_DMA(0x%lx, 0x%lx) only unmaps 
>> 0x%llx",
>> +                     iova, size, unmap.size);
>> +    }
>> +
>>      return 0;
>>  }
>>  
>> @@ -345,6 +352,9 @@ static int vfio_dma_map(VFIOContainer *container, hwaddr 
>> iova,
>>          return 0;
>>      }
>>  
>> +    trace_vfio_dma_map(container->fd, iova, size, vaddr,
>> +                       (readonly ? "r" : "rw"));
>> +
>>      if (!readonly) {
>>          map.flags |= VFIO_DMA_MAP_FLAG_WRITE;
>>      }
>> @@ -985,7 +995,8 @@ int vfio_region_mmap(VFIORegion *region)
>>          trace_vfio_region_mmap(memory_region_name(&region->mmaps[i].mem),
>>                                 region->mmaps[i].offset,
>>                                 region->mmaps[i].offset +
>> -                               region->mmaps[i].size - 1);
>> +                               region->mmaps[i].size - 1,
>> +                               region->mmaps[i].mmap);
>>      }
>>  
>>      return 0;
>> @@ -1696,6 +1707,9 @@ retry:
>>          goto retry;
>>      }
>>  
>> +    trace_vfio_region(vbasedev->name, index, (*info)->offset, (*info)->size,
>> +                      (*info)->cap_offset, (*info)->flags);
>> +
>>      return 0;
>>  }
>>  
>> diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
>> index f72e277..d74e078 100644
>> --- a/hw/vfio/pci.c
>> +++ b/hw/vfio/pci.c
>> @@ -41,6 +41,7 @@
>>  #include "trace.h"
>>  #include "qapi/error.h"
>>  #include "migration/blocker.h"
>> +#include "trace-root.h"
>>  
>>  #define TYPE_VFIO_PCI "vfio-pci"
>>  #define PCI_VFIO(obj)    OBJECT_CHECK(VFIOPCIDevice, obj, TYPE_VFIO_PCI)
>> diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events
>> index 10d899c..83cd0a6 100644
>> --- a/hw/vfio/trace-events
>> +++ b/hw/vfio/trace-events
>> @@ -25,7 +25,7 @@ vfio_pci_size_rom(const char *name, int size) "%s ROM size 
>> 0x%x"
>>  vfio_vga_write(uint64_t addr, uint64_t data, int size) " (0x%"PRIx64", 
>> 0x%"PRIx64", %d)"
>>  vfio_vga_read(uint64_t addr, int size, uint64_t data) " (0x%"PRIx64", %d) = 
>> 0x%"PRIx64
>>  vfio_pci_read_config(const char *name, int addr, int len, int val) " (%s, 
>> @0x%x, len=0x%x) 0x%x"
>> -vfio_pci_write_config(const char *name, int addr, int val, int len) " (%s, 
>> @0x%x, 0x%x, len=0x%x)"
>> +vfio_pci_write_config(const char *name, int addr, int val, int len) "(%s, 
>> @0x%x, 0x%x, 0x%xB)"
>>  vfio_msi_setup(const char *name, int pos) "%s PCI MSI CAP @0x%x"
>>  vfio_msix_early_setup(const char *name, int pos, int table_bar, int offset, 
>> int entries) "%s PCI MSI-X CAP @0x%x, BAR %d, offset 0x%x, entries %d"
>>  vfio_check_pcie_flr(const char *name) "%s Supports FLR via PCIe cap"
>> @@ -37,7 +37,7 @@ vfio_pci_hot_reset_dep_devices(int domain, int bus, int 
>> slot, int function, int
>>  vfio_pci_hot_reset_result(const char *name, const char *result) "%s hot 
>> reset: %s"
>>  vfio_populate_device_config(const char *name, unsigned long size, unsigned 
>> long offset, unsigned long flags) "Device %s config:\n  size: 0x%lx, offset: 
>> 0x%lx, flags: 0x%lx"
>>  vfio_populate_device_get_irq_info_failure(const char *errstr) 
>> "VFIO_DEVICE_GET_IRQ_INFO failure: %s"
>> -vfio_realize(const char *name, int group_id) " (%s) group %d"
>> +vfio_realize(const char *name, int group_id) "(%s) group %d"
>>  vfio_mdev(const char *name, bool is_mdev) " (%s) is_mdev %d"
>>  vfio_add_ext_cap_dropped(const char *name, uint16_t cap, uint16_t offset) 
>> "%s 0x%x@0x%x"
>>  vfio_pci_reset(const char *name) " (%s)"
>> @@ -109,7 +109,7 @@ vfio_get_device(const char * name, unsigned int flags, 
>> unsigned int num_regions,
>>  vfio_put_base_device(int fd) "close vdev->fd=%d"
>>  vfio_region_setup(const char *dev, int index, const char *name, unsigned 
>> long flags, unsigned long offset, unsigned long size) "Device %s, region %d 
>> \"%s\", flags: 0x%lx, offset: 0x%lx, size: 0x%lx"
>>  vfio_region_mmap_fault(const char *name, int index, unsigned long offset, 
>> unsigned long size, int fault) "Region %s mmaps[%d], [0x%lx - 0x%lx], fault: 
>> %d"
>> -vfio_region_mmap(const char *name, unsigned long offset, unsigned long end) 
>> "Region %s [0x%lx - 0x%lx]"
>> +vfio_region_mmap(const char *name, unsigned long offset, unsigned long end, 
>> void *addr) "%s [0x%lx - 0x%lx] maps to %p"
>>  vfio_region_exit(const char *name, int index) "Device %s, region %d"
>>  vfio_region_finalize(const char *name, int index) "Device %s, region %d"
>>  vfio_region_mmaps_set_enabled(const char *name, bool enabled) "Region %s 
>> mmaps enabled: %d"
>> @@ -117,6 +117,9 @@ vfio_region_sparse_mmap_header(const char *name, int 
>> index, int nr_areas) "Devic
>>  vfio_region_sparse_mmap_entry(int i, unsigned long start, unsigned long 
>> end) "sparse entry %d [0x%lx - 0x%lx]"
>>  vfio_get_dev_region(const char *name, int index, uint32_t type, uint32_t 
>> subtype) "%s index %d, %08x/%0x8"
>>  vfio_dma_unmap_overflow_workaround(void) ""
>> +vfio_dma_unmap(int fd, uint64_t iova, uint64_t size) "fd %d, iova 
>> 0x%"PRIx64", len 0x%"PRIx64
>> +vfio_dma_map(int fd, uint64_t iova, uint64_t size, void *addr, const char 
>> *access) "fd %d, iova 0x%"PRIx64", len 0x%"PRIx64", va %p, %s"
>> +vfio_region(const char *name, int index, uint64_t offset, uint64_t size, 
>> int cap_offset, int flags) "%s [%d]: +0x%"PRIx64", 0x%"PRIx64"B, cap +0x%x, 
>> flags 0x%x"
>>  
>>  # platform.c
>>  vfio_platform_base_device_init(char *name, int groupid) "%s belongs to 
>> group #%d"
>> diff --git a/trace-events b/trace-events
>> index 42107eb..98589a4 100644
>> --- a/trace-events
>> +++ b/trace-events
>> @@ -107,6 +107,8 @@ qmp_job_complete(void *job) "job %p"
>>  qmp_job_finalize(void *job) "job %p"
>>  qmp_job_dismiss(void *job) "job %p"
>>  
>> +# exec.c
>> +ram_block_add(void *host, uint64_t maxlen, const char *name, const char 
>> *mode) "host=%p, maxlen=0x%"PRIx64", mr = {name=%s, %s}"
>>  
>>  ### Guest events, keep at bottom
>>  
>> -- 
>> 1.8.3.1
>>