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X-Received-From: 2607:f8b0:4864:20::643 Subject: [Qemu-devel] [RFC v5 6/6] pci_expander_bridge: inform seabios of desired mcfg size via hidden bar X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Zihan Yang , "Michael S. Tsirkin" Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDMRC_1 RDKM_2 RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" pxb-pcie may only consumes a subset of 256 busses in a pci domain, but seab= ios does not know it unless pxb-pcies passes it to seabios. This patch places desired mcfg size into a hidden pci bar. The size is calculated based on desired bus number of a pxb-pcie Signed-off-by: Zihan Yang --- hw/pci-bridge/pci_expander_bridge.c | 5 +++++ include/hw/pci-bridge/pci_expander_bridge.h | 2 ++ 2 files changed, 7 insertions(+) diff --git a/hw/pci-bridge/pci_expander_bridge.c b/hw/pci-bridge/pci_expand= er_bridge.c index 09413df..661de7c 100644 --- a/hw/pci-bridge/pci_expander_bridge.c +++ b/hw/pci-bridge/pci_expander_bridge.c @@ -370,6 +370,11 @@ static void pxb_dev_realize_common(PCIDevice *dev, boo= l pcie, Error **errp) PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK); pci_config_set_class(dev->config, PCI_CLASS_BRIDGE_HOST); =20 + if (pcie && pxb->domain_nr > 0) { + pci_set_long(dev->config + PXB_PCIE_HOST_BRIDGE_MCFG_SIZE, + (pxb->max_bus - pxb->bus_nr + 1) * MiB); + } + pxb_dev_list =3D g_list_insert_sorted(pxb_dev_list, pxb, pxb_compare); return; =20 diff --git a/include/hw/pci-bridge/pci_expander_bridge.h b/include/hw/pci-b= ridge/pci_expander_bridge.h index 5be0a8e..9103eaa 100644 --- a/include/hw/pci-bridge/pci_expander_bridge.h +++ b/include/hw/pci-bridge/pci_expander_bridge.h @@ -20,4 +20,6 @@ typedef struct PXBPCIEHost { /* The mcfg_base of pxb-pcie is not 256MB-aligned, but MB-aligned */ #define PXB_PCIE_HOST_BRIDGE_PCIEXBAR_ADMSK Q35_MASK(64, 35, 20) =20 +#define PXB_PCIE_HOST_BRIDGE_MCFG_SIZE 0x58 /* 32bit regis= ter */ + #endif --=20 2.7.4