diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/exec/memory.h | 9 | ||||
| -rw-r--r-- | include/hw/pci/pci_device.h | 6 |
2 files changed, 13 insertions, 2 deletions
diff --git a/include/exec/memory.h b/include/exec/memory.h index e5e865d1a9..9458e2801d 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -1104,7 +1104,14 @@ struct AddressSpace { QTAILQ_HEAD(, MemoryListener) listeners; QTAILQ_ENTRY(AddressSpace) address_spaces_link; - /* Maximum DMA bounce buffer size used for indirect memory map requests */ + /* + * Maximum DMA bounce buffer size used for indirect memory map requests. + * This limits the total size of bounce buffer allocations made for + * DMA requests to indirect memory regions within this AddressSpace. DMA + * requests that exceed the limit (e.g. due to overly large requested size + * or concurrent DMA requests having claimed too much buffer space) will be + * rejected and left to the caller to handle. + */ size_t max_bounce_buffer_size; /* Total size of bounce buffers currently allocated, atomically accessed */ size_t bounce_buffer_size; diff --git a/include/hw/pci/pci_device.h b/include/hw/pci/pci_device.h index 91df40f989..8eaf0d58bb 100644 --- a/include/hw/pci/pci_device.h +++ b/include/hw/pci/pci_device.h @@ -168,7 +168,11 @@ struct PCIDevice { char *failover_pair_id; uint32_t acpi_index; - /* Maximum DMA bounce buffer size used for indirect memory map requests */ + /* + * Indirect DMA region bounce buffer size as configured for the device. This + * is a configuration parameter that is reflected into bus_master_as when + * realizing the device. + */ uint32_t max_bounce_buffer_size; }; |