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[Qemu-devel] [PATCH v3 23/23] pci: honor PCI_COMMAND_MASTER
From: |
Avi Kivity |
Subject: |
[Qemu-devel] [PATCH v3 23/23] pci: honor PCI_COMMAND_MASTER |
Date: |
Tue, 9 Oct 2012 18:32:48 +0200 |
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 <address@hidden>
---
hw/pci.c | 13 +++++++++++--
hw/pci.h | 1 +
2 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/hw/pci.c b/hw/pci.c
index 8e8e030..7adf61b 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);
}
@@ -841,6 +845,7 @@ static void do_pci_unregister_device(PCIDevice *pci_dev)
if (!pci_dev->bus->dma_context_fn) {
address_space_destroy(&pci_dev->bus_master_as);
+ memory_region_destroy(&pci_dev->bus_master_enable_region);
g_free(pci_dev->dma);
pci_dev->dma = NULL;
}
@@ -1065,8 +1070,12 @@ 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 */
--
1.7.12
- [Qemu-devel] [PATCH v3 09/23] memory: drop no-op MemoryListener callbacks, (continued)
- [Qemu-devel] [PATCH v3 09/23] memory: drop no-op MemoryListener callbacks, Avi Kivity, 2012/10/09
- [Qemu-devel] [PATCH v3 06/23] memory: export AddressSpace, Avi Kivity, 2012/10/09
- [Qemu-devel] [PATCH v3 17/23] memory: use AddressSpace for MemoryListener filtering, Avi Kivity, 2012/10/09
- [Qemu-devel] [PATCH v3 18/23] s390: avoid reaching into memory core internals, Avi Kivity, 2012/10/09
- [Qemu-devel] [PATCH v3 21/23] memory: add address_space_destroy(), Avi Kivity, 2012/10/09
- [Qemu-devel] [PATCH v3 22/23] pci: give each device its own address space, Avi Kivity, 2012/10/09
- [Qemu-devel] [PATCH v3 14/23] memory: manage coalesced mmio via a MemoryListener, Avi Kivity, 2012/10/09
- [Qemu-devel] [PATCH v3 13/23] xen: drop no-op MemoryListener callbacks, Avi Kivity, 2012/10/09
- [Qemu-devel] [PATCH v3 07/23] memory: maintain a list of address spaces, Avi Kivity, 2012/10/09
- [Qemu-devel] [PATCH v3 15/23] memory: move address_space_memory and address_space_io out of memory core, Avi Kivity, 2012/10/09
- [Qemu-devel] [PATCH v3 23/23] pci: honor PCI_COMMAND_MASTER,
Avi Kivity <=
[Qemu-devel] [PATCH v3 11/23] xen_pt: drop no-op MemoryListener callbacks, Avi Kivity, 2012/10/09
[Qemu-devel] [PATCH v3 16/23] memory: move tcg flush into a tcg memory listener, Avi Kivity, 2012/10/09
[Qemu-devel] [PATCH v3 05/23] memory: prepare AddressSpace for exporting, Avi Kivity, 2012/10/09
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