Patchwork [RFC,v1,22/22] pci: honor PCI_COMMAND_MASTER

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Submitter Avi Kivity
Date Oct. 3, 2012, 4:04 p.m.
Message ID <1349280245-16341-23-git-send-email-avi@redhat.com>
Download mbox | patch
Permalink /patch/188854/
State New
Headers show

Comments

Avi Kivity - Oct. 3, 2012, 4:04 p.m.
Currently we ignore PCI_COMMAND_MASTER completely: DMA succeeds even when
the bit is clear.

Honor PCI_COMMAND_MASTER by inserting a memory region into the device's
bus master address space, and tying its enable status to PCI_COMMAND_MASTER.

Tested using

  setpci -s 03 COMMAND=3

while a ping was running on a NIC in slot 3.  The kernel (Linux) detected
the stall and recovered after the command

  setpci -s 03 COMMAND=7

was issued.

Signed-off-by: Avi Kivity <avi@redhat.com>
---
 hw/pci.c | 12 ++++++++++--
 hw/pci.h |  1 +
 2 files changed, 11 insertions(+), 2 deletions(-)

Patch

diff --git a/hw/pci.c b/hw/pci.c
index ecea286..6ba5ae5 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -782,7 +782,11 @@  static PCIDevice *do_pci_register_device(PCIDevice *pci_dev, PCIBus *bus,
         /* FIXME: Make dma_context_fn use MemoryRegions instead, so this path is
          * taken unconditionally */
         /* FIXME: inherit memory region from bus creator */
-        address_space_init(&pci_dev->bus_master_as, get_system_memory());
+        memory_region_init_alias(&pci_dev->bus_master_enable_region, "bus master",
+                                 get_system_memory(), 0,
+                                 memory_region_size(get_system_memory()));
+        memory_region_set_enabled(&pci_dev->bus_master_enable_region, false);
+        address_space_init(&pci_dev->bus_master_as, &pci_dev->bus_master_enable_region);
         pci_dev->dma = g_new(DMAContext, 1);
         dma_context_init(pci_dev->dma, &pci_dev->bus_master_as, NULL, NULL, NULL);
     }
@@ -1060,8 +1064,12 @@  void pci_default_write_config(PCIDevice *d, uint32_t addr, uint32_t val, int l)
         range_covers_byte(addr, l, PCI_COMMAND))
         pci_update_mappings(d);
 
-    if (range_covers_byte(addr, l, PCI_COMMAND))
+    if (range_covers_byte(addr, l, PCI_COMMAND)) {
         pci_update_irq_disabled(d, was_irq_disabled);
+        memory_region_set_enabled(&d->bus_master_enable_region,
+                                  pci_get_word(d->config + PCI_COMMAND)
+                                    & PCI_COMMAND_MASTER);
+    }
 
     msi_write_config(d, addr, val, l);
     msix_write_config(d, addr, val, l);
diff --git a/hw/pci.h b/hw/pci.h
index 3192d81..a65e490 100644
--- a/hw/pci.h
+++ b/hw/pci.h
@@ -212,6 +212,7 @@  struct PCIDevice {
     char name[64];
     PCIIORegion io_regions[PCI_NUM_REGIONS];
     AddressSpace bus_master_as;
+    MemoryRegion bus_master_enable_region;
     DMAContext *dma;
 
     /* do not access the following fields */