From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sheng Yang Subject: [PATCH 4/6] Figure out device capability Date: Wed, 7 Jan 2009 18:49:29 +0800 Message-ID: <1231325371-22896-5-git-send-email-sheng@linux.intel.com> References: <1231325371-22896-1-git-send-email-sheng@linux.intel.com> Cc: Anthony Liguori , kvm@vger.kernel.org, Sheng Yang , Allen Kay To: Avi Kivity Return-path: Received: from mga11.intel.com ([192.55.52.93]:44087 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752003AbZAGKtk (ORCPT ); Wed, 7 Jan 2009 05:49:40 -0500 In-Reply-To: <1231325371-22896-1-git-send-email-sheng@linux.intel.com> Sender: kvm-owner@vger.kernel.org List-ID: Try to figure out device capability in update_dev_cap(). Now we are only care about MSI capability. The function pci_find_cap_offset original function wrote by Allen for Xen. Notice the function need root privilege to work. This depends on libpci to work. Signed-off-by: Allen Kay Signed-off-by: Sheng Yang --- qemu/hw/device-assignment.c | 29 +++++++++++++++++++++++++++++ qemu/hw/device-assignment.h | 1 + 2 files changed, 30 insertions(+), 0 deletions(-) diff --git a/qemu/hw/device-assignment.c b/qemu/hw/device-assignment.c index f357d17..169357f 100644 --- a/qemu/hw/device-assignment.c +++ b/qemu/hw/device-assignment.c @@ -222,6 +222,35 @@ static void assigned_dev_ioport_map(PCIDevice *pci_dev, int region_num, (r_dev->v_addrs + region_num)); } +static uint8_t pci_find_cap_offset(struct pci_dev *pci_dev, uint8_t cap) +{ + int id; + int max_cap = 48; + int pos = PCI_CAPABILITY_LIST; + int status; + + status = pci_read_byte(pci_dev, PCI_STATUS); + if ((status & PCI_STATUS_CAP_LIST) == 0) + return 0; + + while (max_cap--) { + pos = pci_read_byte(pci_dev, pos); + if (pos < 0x40) + break; + + pos &= ~3; + id = pci_read_byte(pci_dev, pos + PCI_CAP_LIST_ID); + + if (id == 0xff) + break; + if (id == cap) + return pos; + + pos += PCI_CAP_LIST_NEXT; + } + return 0; +} + static void assigned_dev_pci_write_config(PCIDevice *d, uint32_t address, uint32_t val, int len) { diff --git a/qemu/hw/device-assignment.h b/qemu/hw/device-assignment.h index a565948..2d83566 100644 --- a/qemu/hw/device-assignment.h +++ b/qemu/hw/device-assignment.h @@ -29,6 +29,7 @@ #define __DEVICE_ASSIGNMENT_H__ #include +#include #include "qemu-common.h" #include "sys-queue.h" #include "pci.h" -- 1.5.4.5