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Tue, 15 Oct 2024 21:14:04 GMT Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D061D2004F; Tue, 15 Oct 2024 21:14:03 +0000 (GMT) Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B45BB20043; Tue, 15 Oct 2024 21:14:01 +0000 (GMT) Received: from gfwr518.rchland.ibm.com (unknown [9.10.239.106]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 15 Oct 2024 21:14:01 +0000 (GMT) From: Michael Kowal To: qemu-devel@nongnu.org Cc: qemu-ppc@nongnu.org, clg@kaod.org, fbarrat@linux.ibm.com, npiggin@gmail.com, milesg@linux.ibm.com, danielhb413@gmail.com, david@gibson.dropbear.id.au, harshpb@linux.ibm.com, thuth@redhat.com, lvivier@redhat.com, pbonzini@redhat.com Subject: [PATCH 11/14] pnv/xive: Only support crowd size of 0, 2, 4 and 16 Date: Tue, 15 Oct 2024 16:13:26 -0500 Message-Id: <20241015211329.21113-12-kowal@linux.ibm.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241015211329.21113-1-kowal@linux.ibm.com> References: <20241015211329.21113-1-kowal@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: _mprSJYJOPy5qNjPGapRDp1pW00bqZSy X-Proofpoint-ORIG-GUID: adWKgyedtRMrH4yqAqTuUG0uvhhQWmel X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-15_01,2024-10-11_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 impostorscore=0 malwarescore=0 mlxlogscore=999 clxscore=1015 spamscore=0 lowpriorityscore=0 phishscore=0 bulkscore=0 adultscore=0 priorityscore=1501 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2410150140 Received-SPF: pass client-ip=148.163.158.5; envelope-from=kowal@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-ppc@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-ppc-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-ppc-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Glenn Miles XIVE crowd sizes are encoded into a 2-bit field as follows: 0: 0b00 2: 0b01 4: 0b10 16: 0b11 A crowd size of 8 is not supported. Signed-off-by: Glenn Miles Signed-off-by: Michael Kowal --- hw/intc/xive.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/hw/intc/xive.c b/hw/intc/xive.c index d5fbd9bbd8..565f0243bd 100644 --- a/hw/intc/xive.c +++ b/hw/intc/xive.c @@ -1687,7 +1687,26 @@ static uint8_t xive_get_group_level(bool crowd, bool ignore, uint8_t level = 0; if (crowd) { - level = ((ctz32(~nvp_blk) + 1) & 0b11) << 4; + /* crowd level is bit position of first 0 from the right in nvp_blk */ + level = ctz32(~nvp_blk) + 1; + + /* + * Supported crowd sizes are 2^1, 2^2, and 2^4. 2^3 is not supported. + * HW will encode level 4 as the value 3. See xive2_pgofnext(). + */ + switch (level) { + case 1: + case 2: + break; + case 4: + level = 3; + break; + default: + g_assert_not_reached(); + } + + /* Crowd level bits reside in upper 2 bits of the 6 bit group level */ + level <<= 4; } if (ignore) { level |= (ctz32(~nvp_index) + 1) & 0b1111;