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hw_x86_64_muen: Add support for MSI 

Use the new Sinfo::get_dev_info function to retrieve device information
in the platform-specific get_msi_params function. If the requested
device supports MSI, set the IRQ and MSI address/data register values to
enable MSIs in remappable format (see VT-d specification, section
5.1.2.2).

Currently only one MSI per device is supported as the subhandle in the
data register is always set to 0.
This commit is contained in:
Reto Buerki 2016-02-16 17:13:47 +01:00 committed by Christian Helmuth
parent d137f0f2bf
commit 3c23ddb2d5
1 changed files with 65 additions and 1 deletions
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66
repos/base-hw/src/core/spec/x86_64/muen/platform_support.cc
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@ -12,17 +12,63 @@
* under the terms of the GNU General Public License version 2.
*/
/* Genode includes */
#include <util/mmio.h>
/* core includes */
#include <platform.h>
#include <sinfo.h>
using namespace Genode;
struct Mmconf_address : Register<64>
{
enum { PCI_CONFIG_BASE = 0xf8000000 };
struct Sid : Bitfield<12, 16> { };
/**
* Calculate SID (source-id, see VT-d spec section 3.4.1) from device PCI
* config space address.
*/
static unsigned to_sid(access_t const addr) {
return Sid::get(addr - PCI_CONFIG_BASE); }
};
struct Msi_handle : Register<16>
{
struct Bits_0 : Bitfield<0, 15> { };
struct Bits_1 : Bitfield<15, 1> { };
};
struct Msi_address : Register<32>
{
enum { BASE = 0xfee00010 };
struct Bits_0 : Bitfield<5, 15> { };
struct Bits_1 : Bitfield<2, 1> { };
/**
* Return MSI address register value for given handle to enable Interrupt
* Requests in Remappable Format, see VT-d specification section 5.1.2.2.
*/
static access_t to_msi_addr(Msi_handle::access_t const handle)
{
access_t addr = BASE;
Bits_0::set(addr, Msi_handle::Bits_0::get(handle));
Bits_1::set(addr, Msi_handle::Bits_1::get(handle));
return addr;
}
};
Native_region * Platform::_core_only_mmio_regions(unsigned const i)
{
static Native_region _regions[] =
{
/* Sinfo pages */
{ 0x000e00000000, 0x7000 },
/* Timer page */
{ 0x000e00010000, 0x1000 },
};
@ -36,7 +82,25 @@ void Platform::setup_irq_mode(unsigned, unsigned, unsigned) { }
bool Platform::get_msi_params(const addr_t mmconf, addr_t &address,
addr_t &data, unsigned &irq_number)
{
return false;
const unsigned sid = Mmconf_address::to_sid(mmconf);
struct Sinfo::Dev_info dev_info;
if (!Sinfo::get_dev_info(sid, &dev_info)) {
PERR("error retrieving Muen info for device with SID 0x%x", sid);
return false;
}
if (!dev_info.msi_capable) {
PERR("device 0x%x not configured for MSI", sid);
return false;
}
data = 0;
address = Msi_address::to_msi_addr(dev_info.irte_start);
irq_number = dev_info.irq_start;
PDBG("enabling MSI for device with SID 0x%x: IRTE %d, IRQ %d",
sid, dev_info.irte_start, irq_number);
return true;
}