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* [Qemu-devel] [PATCH] hw/arm/virt-acpi-build: _CCA attribute is compulsary
@ 2015-11-02 10:39 Graeme Gregory
  2015-11-03  2:25 ` Shannon Zhao
  0 siblings, 1 reply; 5+ messages in thread
From: Graeme Gregory @ 2015-11-02 10:39 UTC (permalink / raw)
  To: qemu-devel; +Cc: Graeme Gregory, shannon.zhao, tomasz.nowicki

According to ACPI specification 6.2.17 _CCA (Cache Coherency Attribute)
this attribute is compulsary on ARM systems. Add this attribute to
the PCI host bridges as required.

Without this the kernel will produce the error
[Firmware Bug]: PCI device 0000:00:00.0 fail to setup DMA.

Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
---
 hw/arm/virt-acpi-build.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index 1aaff1f..1430125 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -180,6 +180,7 @@ static void acpi_dsdt_add_pci(Aml *scope, const MemMapEntry *memmap, int irq,
     aml_append(dev, aml_name_decl("_ADR", aml_int(0)));
     aml_append(dev, aml_name_decl("_UID", aml_string("PCI0")));
     aml_append(dev, aml_name_decl("_STR", aml_unicode("PCIe 0 Device")));
+    aml_append(dev, aml_name_decl("_CCA", aml_int(1)));
 
     /* Declare the PCI Routing Table. */
     Aml *rt_pkg = aml_package(nr_pcie_buses * PCI_NUM_PINS);
-- 
2.4.3

^ permalink raw reply related	[flat|nested] 5+ messages in thread

end of thread, other threads:[~2015-11-03 13:26 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2015-11-02 10:39 [Qemu-devel] [PATCH] hw/arm/virt-acpi-build: _CCA attribute is compulsary Graeme Gregory
2015-11-03  2:25 ` Shannon Zhao
2015-11-03  8:31   ` Graeme Gregory
2015-11-03  9:08     ` Shannon Zhao
2015-11-03 13:26       ` Peter Maydell

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