From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:59451) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ga3E8-0004jO-Vv for qemu-devel@nongnu.org; Thu, 20 Dec 2018 13:39:24 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ga3Dv-0008Mz-1L for qemu-devel@nongnu.org; Thu, 20 Dec 2018 13:39:13 -0500 Received: from mx1.redhat.com ([209.132.183.28]:33118) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ga3Do-00089J-Fh for qemu-devel@nongnu.org; Thu, 20 Dec 2018 13:39:03 -0500 Date: Thu, 20 Dec 2018 13:38:53 -0500 From: "Michael S. Tsirkin" Message-ID: <20181220183059.20726-15-mst@redhat.com> References: <20181220183059.20726-1-mst@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181220183059.20726-1-mst@redhat.com> Subject: [Qemu-devel] [PULL v3 14/44] pcie: Fill PCIESlot link fields to support higher speeds and widths List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Peter Maydell , Alex Williamson , Marcel Apfelbaum , Geoffrey McRae From: Alex Williamson Make use of the PCIESlot speed and width fields to update link information beyond those configured in pcie_cap_v1_fill(). This is only called for devices supporting a version 2 capability and automatically skips any non-PCIESlot devices. Only devices with increased link values generate any visible config space differences. Cc: Marcel Apfelbaum Tested-by: Geoffrey McRae Signed-off-by: Alex Williamson Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/pci/pcie.c | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c index 6891deb711..d91a615193 100644 --- a/hw/pci/pcie.c +++ b/hw/pci/pcie.c @@ -27,6 +27,7 @@ #include "hw/pci/msi.h" #include "hw/pci/pci_bus.h" #include "hw/pci/pcie_regs.h" +#include "hw/pci/pcie_port.h" #include "qemu/range.h" //#define DEBUG_PCIE @@ -87,6 +88,76 @@ pcie_cap_v1_fill(PCIDevice *dev, uint8_t port, uint8_t type, uint8_t version) pci_set_word(cmask + PCI_EXP_LNKSTA, 0); } +static void pcie_cap_fill_slot_lnk(PCIDevice *dev) +{ + PCIESlot *s = (PCIESlot *)object_dynamic_cast(OBJECT(dev), TYPE_PCIE_SLOT); + uint8_t *exp_cap = dev->config + dev->exp.exp_cap; + + /* Skip anything that isn't a PCIESlot */ + if (!s) { + return; + } + + /* Clear and fill LNKCAP from what was configured above */ + pci_long_test_and_clear_mask(exp_cap + PCI_EXP_LNKCAP, + PCI_EXP_LNKCAP_MLW | PCI_EXP_LNKCAP_SLS); + pci_long_test_and_set_mask(exp_cap + PCI_EXP_LNKCAP, + QEMU_PCI_EXP_LNKCAP_MLW(s->width) | + QEMU_PCI_EXP_LNKCAP_MLS(s->speed)); + + /* + * Link bandwidth notification is required for all root ports and + * downstream ports supporting links wider than x1 or multiple link + * speeds. + */ + if (s->width > QEMU_PCI_EXP_LNK_X1 || + s->speed > QEMU_PCI_EXP_LNK_2_5GT) { + pci_long_test_and_set_mask(exp_cap + PCI_EXP_LNKCAP, + PCI_EXP_LNKCAP_LBNC); + } + + if (s->speed > QEMU_PCI_EXP_LNK_2_5GT) { + /* + * Hot-plug capable downstream ports and downstream ports supporting + * link speeds greater than 5GT/s must hardwire PCI_EXP_LNKCAP_DLLLARC + * to 1b. PCI_EXP_LNKCAP_DLLLARC implies PCI_EXP_LNKSTA_DLLLA, which + * we also hardwire to 1b here. 2.5GT/s hot-plug slots should also + * technically implement this, but it's not done here for compatibility. + */ + pci_long_test_and_set_mask(exp_cap + PCI_EXP_LNKCAP, + PCI_EXP_LNKCAP_DLLLARC); + pci_word_test_and_set_mask(exp_cap + PCI_EXP_LNKSTA, + PCI_EXP_LNKSTA_DLLLA); + + /* + * Target Link Speed defaults to the highest link speed supported by + * the component. 2.5GT/s devices are permitted to hardwire to zero. + */ + pci_word_test_and_clear_mask(exp_cap + PCI_EXP_LNKCTL2, + PCI_EXP_LNKCTL2_TLS); + pci_word_test_and_set_mask(exp_cap + PCI_EXP_LNKCTL2, + QEMU_PCI_EXP_LNKCAP_MLS(s->speed) & + PCI_EXP_LNKCTL2_TLS); + } + + /* + * 2.5 & 5.0GT/s can be fully described by LNKCAP, but 8.0GT/s is + * actually a reference to the highest bit supported in this register. + * We assume the device supports all link speeds. + */ + if (s->speed > QEMU_PCI_EXP_LNK_5GT) { + pci_long_test_and_clear_mask(exp_cap + PCI_EXP_LNKCAP2, ~0U); + pci_long_test_and_set_mask(exp_cap + PCI_EXP_LNKCAP2, + PCI_EXP_LNKCAP2_SLS_2_5GB | + PCI_EXP_LNKCAP2_SLS_5_0GB | + PCI_EXP_LNKCAP2_SLS_8_0GB); + if (s->speed > QEMU_PCI_EXP_LNK_8GT) { + pci_long_test_and_set_mask(exp_cap + PCI_EXP_LNKCAP2, + PCI_EXP_LNKCAP2_SLS_16_0GB); + } + } +} + int pcie_cap_init(PCIDevice *dev, uint8_t offset, uint8_t type, uint8_t port, Error **errp) @@ -108,6 +179,9 @@ int pcie_cap_init(PCIDevice *dev, uint8_t offset, /* Filling values common with v1 */ pcie_cap_v1_fill(dev, port, type, PCI_EXP_FLAGS_VER2); + /* Fill link speed and width options */ + pcie_cap_fill_slot_lnk(dev); + /* Filling v2 specific values */ pci_set_long(exp_cap + PCI_EXP_DEVCAP2, PCI_EXP_DEVCAP2_EFF | PCI_EXP_DEVCAP2_EETLPP); -- MST