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Thu, 23 Dec 2021 00:29:11 +0000 (GMT) Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 080ADC605D; Thu, 23 Dec 2021 00:29:10 +0000 (GMT) Received: from localhost.localdomain (unknown [9.160.90.83]) by b03ledav006.gho.boulder.ibm.com (Postfix) with ESMTP; Thu, 23 Dec 2021 00:29:10 +0000 (GMT) Message-ID: Subject: [PATCH v2 06/10] powerpc/vas: Map paste address only if window is active From: Haren Myneni To: mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org, npiggin@gmail.com Date: Wed, 22 Dec 2021 16:29:08 -0800 In-Reply-To: <9d1730d5e0daf39ef17196b4699294dc2ccf4a63.camel@linux.ibm.com> References: <9d1730d5e0daf39ef17196b4699294dc2ccf4a63.camel@linux.ibm.com> User-Agent: Evolution 3.36.5 (3.36.5-2.fc32) MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 1SQnwXzhUg2YdsJsDwO3l1mOKR4fNSKt X-Proofpoint-ORIG-GUID: 0lVVnNKWy8o3N2L03fCUj3_DvGVWqjoK X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2021-12-22_09,2021-12-22_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 impostorscore=0 malwarescore=0 mlxscore=0 bulkscore=0 adultscore=0 priorityscore=1501 suspectscore=0 spamscore=0 lowpriorityscore=0 clxscore=1015 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112220124 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: , Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" The paste address mapping is done with mmap() after the window is opened with ioctl. But the window can be closed due to lost credit due to core removal before mmap(). So if the window is not active, return mmap() failure with -EACCES and expects the user space reissue mmap() when the window is active or open new window when the credit is available. Signed-off-by: Haren Myneni --- arch/powerpc/platforms/book3s/vas-api.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/platforms/book3s/vas-api.c b/arch/powerpc/platforms/book3s/vas-api.c index a63fd48e34a7..2d06bd1b1935 100644 --- a/arch/powerpc/platforms/book3s/vas-api.c +++ b/arch/powerpc/platforms/book3s/vas-api.c @@ -379,10 +379,27 @@ static int coproc_mmap(struct file *fp, struct vm_area_struct *vma) return -EACCES; } + /* + * The initial mapping is done after the window is opened + * with ioctl. But this window might have been closed + * due to lost credit (core removal on PowerVM) before mmap(). + * So if the window is not active, return mmap() failure + * with -EACCES and expects the user space reconfigure (mmap) + * window when it is active again or open new window when + * the credit is available. + */ + mutex_lock(&txwin->task_ref.mmap_mutex); + if (txwin->status != VAS_WIN_ACTIVE) { + pr_err("%s(): Window is not active\n", __func__); + rc = -EACCES; + goto out; + } + paste_addr = cp_inst->coproc->vops->paste_addr(txwin); if (!paste_addr) { pr_err("%s(): Window paste address failed\n", __func__); - return -EINVAL; + rc = -EINVAL; + goto out; } pfn = paste_addr >> PAGE_SHIFT; @@ -401,6 +418,8 @@ static int coproc_mmap(struct file *fp, struct vm_area_struct *vma) txwin->task_ref.vma = vma; +out: + mutex_unlock(&txwin->task_ref.mmap_mutex); return rc; }