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b=ZHU4TUhqH3BvqRjbBQtGKLxiLd/P3KINCvCYWQrdVgtClwL8EBNIFjQ6Vr3oSDBJFeSM 6ErJ7QVdpP1Utgdztj4YSQEzJKKm11HX5cRWWLTUfVFlCjBLND19BPbofVvxsjbSkjvz 9zseONAUL6wr0rCyOB0XHdPwVuHiJY130xGfBiKFkeA32OxZkeATv8DHbBO9e92Gm2fr 5jtUSX4MlWPtA59hMBsmDOZ8dUhijm29PKsXFN8horqomYIzXpk55rAwA1JK8/Y2mgwO aSaoo/iXxKUukPODz2wFJcNt+oWSCFawzitfcbusyJwbHJBS+wX8OUoEhW1ZLgbNE4mq cw== From: Saif Abrar To: qemu-ppc@nongnu.org, qemu-devel@nongnu.org Cc: clg@kaod.org, npiggin@gmail.com, fbarrat@linux.ibm.com, mst@redhat.com, marcel.apfelbaum@gmail.com, cohuck@redhat.com, pbonzini@redhat.com, thuth@redhat.com, lvivier@redhat.com, saif.abrar@linux.vnet.ibm.com Subject: [PATCH 07/10] pnv/phb4: Set link speed and width in the DLP training control register Date: Thu, 21 Mar 2024 05:04:19 -0500 Message-Id: <20240321100422.5347-8-saif.abrar@linux.vnet.ibm.com> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20240321100422.5347-1-saif.abrar@linux.vnet.ibm.com> References: <20240321100422.5347-1-saif.abrar@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-GUID: GmeS-rL3pzEFGC2OpPXT7_z_KhECocFa X-Proofpoint-ORIG-GUID: KzlHthrTuVkWM386X7f01Y_cjD7sQNev X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-03-21_06,2024-03-18_03,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 mlxlogscore=999 lowpriorityscore=0 clxscore=1015 bulkscore=0 malwarescore=0 suspectscore=0 impostorscore=0 priorityscore=1501 mlxscore=0 spamscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2403140000 definitions=main-2403210069 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: none client-ip=148.163.158.5; envelope-from=saif.abrar@linux.vnet.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @ibm.com) X-ZM-MESSAGEID: 1711015526249100001 Content-Type: text/plain; charset="utf-8" Get the current link-status from PCIE macro. Extract link-speed and link-width from the link-status and set in the DLP training control (PCIE_DLP_TCR) register. Signed-off-by: Saif Abrar Reviewed-by: C=C3=A9dric Le Goater --- hw/pci-host/pnv_phb4.c | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-) diff --git a/hw/pci-host/pnv_phb4.c b/hw/pci-host/pnv_phb4.c index 7b3d75bae6..6823ffab54 100644 --- a/hw/pci-host/pnv_phb4.c +++ b/hw/pci-host/pnv_phb4.c @@ -980,10 +980,27 @@ static uint64_t pnv_phb4_reg_read(void *opaque, hwadd= r off, unsigned size) val |=3D PHB_PCIE_SCR_PLW_X16; /* RO bit */ break; =20 - /* Link training always appears trained */ case PHB_PCIE_DLP_TRAIN_CTL: - /* TODO: Do something sensible with speed ? */ + /* Link training always appears trained */ val |=3D PHB_PCIE_DLP_INBAND_PRESENCE | PHB_PCIE_DLP_TL_LINKACT; + + /* Get the current link-status from PCIE */ + uint32_t exp_offset =3D get_exp_offset(phb); + uint32_t lnkstatus =3D bswap32(pnv_phb4_rc_config_read(phb, + exp_offset + PCI_EXP_LNKSTA, 4)); + + /* Extract link-speed from the link-status */ + uint32_t v =3D lnkstatus & PCI_EXP_LNKSTA_CLS; + /* Set the current link-speed at the LINK_SPEED position */ + val =3D SETFIELD(PHB_PCIE_DLP_LINK_SPEED, val, v); + + /* + * Extract link-width from the link-status, + * after shifting the required bitfields. + */ + v =3D (lnkstatus & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT; + /* Set the current link-width at the LINK_WIDTH position */ + val =3D SETFIELD(PHB_PCIE_DLP_LINK_WIDTH, val, v); return val; =20 /* --=20 2.39.3