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Mon, 09 Dec 2019 03:29:36 +0000 Received: from b03ledav005.gho.boulder.ibm.com (b03ledav005.gho.boulder.ibm.com [9.17.130.236]) by b03cxnp07028.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id xB93TZU251446108 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 9 Dec 2019 03:29:35 GMT Received: from b03ledav005.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 602A3BE051; Mon, 9 Dec 2019 03:29:35 +0000 (GMT) Received: from b03ledav005.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A805BBE04F; Mon, 9 Dec 2019 03:29:34 +0000 (GMT) Received: from [9.70.82.143] (unknown [9.70.82.143]) by b03ledav005.gho.boulder.ibm.com (Postfix) with ESMTP; Mon, 9 Dec 2019 03:29:34 +0000 (GMT) Subject: [PATCH V2 02/13] powerpc/vas: Define nx_fault_stamp in coprocessor_request_block From: Haren Myneni To: mpe@ellerman.id.au In-Reply-To: <1575861522.16318.9.camel@hbabu-laptop> References: <1575861522.16318.9.camel@hbabu-laptop> Content-Type: text/plain; charset="UTF-8" Date: Sun, 08 Dec 2019 19:27:55 -0800 Message-ID: <1575862075.16318.17.camel@hbabu-laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.95,18.0.572 definitions=2019-12-08_07:2019-12-05,2019-12-08 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 clxscore=1015 suspectscore=1 mlxscore=0 spamscore=0 priorityscore=1501 malwarescore=0 adultscore=0 phishscore=0 lowpriorityscore=0 impostorscore=0 mlxlogscore=742 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-1912090028 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, mikey@neuling.org, herbert@gondor.apana.org.au, npiggin@gmail.com, hch@infradead.org, sukadev@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Kernel sets fault address and status in CRB for NX page fault on user space address after processing page fault. User space gets the signal and handles the fault mentioned in CRB by bringing the page in to memory and send NX request again. Signed-off-by: Sukadev Bhattiprolu Signed-off-by: Haren Myneni --- arch/powerpc/include/asm/icswx.h | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/include/asm/icswx.h b/arch/powerpc/include/asm/icswx.h index 9872f85..b233d1e 100644 --- a/arch/powerpc/include/asm/icswx.h +++ b/arch/powerpc/include/asm/icswx.h @@ -108,6 +108,17 @@ struct data_descriptor_entry { __be64 address; } __packed __aligned(DDE_ALIGN); +/* 4.3.2 NX-stamped Fault CRB */ + +#define NX_STAMP_ALIGN (0x10) + +struct nx_fault_stamp { + __be64 fault_storage_addr; + __be16 reserved; + __u8 flags; + __u8 fault_status; + __be32 pswid; +} __packed __aligned(NX_STAMP_ALIGN); /* Chapter 6.5.2 Coprocessor-Request Block (CRB) */ @@ -135,7 +146,12 @@ struct coprocessor_request_block { struct coprocessor_completion_block ccb; - u8 reserved[48]; + union { + struct nx_fault_stamp nx; + u8 reserved[16]; + } stamp; + + u8 reserved[32]; struct coprocessor_status_block csb; } __packed __aligned(CRB_ALIGN); -- 1.8.3.1