From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3yjGhN4XyFzDrpf for ; Thu, 23 Nov 2017 22:05:40 +1100 (AEDT) Received: from pps.filterd (m0098410.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id vANB5CTL145085 for ; Thu, 23 Nov 2017 06:05:38 -0500 Received: from e06smtp11.uk.ibm.com (e06smtp11.uk.ibm.com [195.75.94.107]) by mx0a-001b2d01.pphosted.com with ESMTP id 2edscsg2ky-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Thu, 23 Nov 2017 06:05:37 -0500 Received: from localhost by e06smtp11.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 23 Nov 2017 11:05:35 -0000 From: Christophe Lombard To: linuxppc-dev@lists.ozlabs.org, fbarrat@linux.vnet.ibm.com, vaibhav@linux.vnet.ibm.com, andrew.donnellan@au1.ibm.com Subject: [PATCH] cxl: Add support for ASB_Notify on POWER9 Date: Thu, 23 Nov 2017 12:05:32 +0100 Message-Id: <1511435132-24020-1-git-send-email-clombard@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , The POWER9 core supports a new feature: ASB_Notify which requires the support of the Special Purpose Register: TIDR. The ASB_Notify command, generated by the AFU, will attempt to wake-up the host thread identified by the particular LPID:PID:TID. This patch assign a unique TIDR (thread id) for the current thread which will be used in the process element entry. Signed-off-by: Christophe Lombard --- arch/powerpc/kernel/process.c | 2 ++ drivers/misc/cxl/api.c | 9 +++++++++ drivers/misc/cxl/context.c | 21 +++++++++++++++++++++ drivers/misc/cxl/cxl.h | 6 ++++++ drivers/misc/cxl/cxllib.c | 2 +- drivers/misc/cxl/file.c | 13 +++++++++++++ drivers/misc/cxl/native.c | 2 +- include/uapi/misc/cxl.h | 3 ++- 8 files changed, 55 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index bfdd783..370fec9 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1557,6 +1557,7 @@ void clear_thread_tidr(struct task_struct *t) free_thread_tidr(t->thread.tidr); t->thread.tidr = 0; } +EXPORT_SYMBOL_GPL(clear_thread_tidr); void arch_release_task_struct(struct task_struct *t) { @@ -1583,6 +1584,7 @@ int set_thread_tidr(struct task_struct *t) return 0; } +EXPORT_SYMBOL_GPL(set_thread_tidr); #endif /* CONFIG_PPC64 */ diff --git a/drivers/misc/cxl/api.c b/drivers/misc/cxl/api.c index 7c11bad..121bfbc 100644 --- a/drivers/misc/cxl/api.c +++ b/drivers/misc/cxl/api.c @@ -684,3 +684,12 @@ void _cxl_cx4_teardown_msi_irqs(struct pci_dev *pdev) } } /* Exported via cxl_base */ + +int cxl_thread_tidr(struct cxl_context *ctx, int assign) +{ + if (!ctx) + return -EINVAL; + + return cxl_context_thread_tidr(ctx, assign); +} +EXPORT_SYMBOL_GPL(cxl_thread_tidr); diff --git a/drivers/misc/cxl/context.c b/drivers/misc/cxl/context.c index 12a41b2..6fd61a8 100644 --- a/drivers/misc/cxl/context.c +++ b/drivers/misc/cxl/context.c @@ -22,6 +22,7 @@ #include #include #include +#include #include "cxl.h" @@ -42,6 +43,7 @@ int cxl_context_init(struct cxl_context *ctx, struct cxl_afu *afu, bool master) ctx->afu = afu; ctx->master = master; + ctx->tid = 0; ctx->pid = NULL; /* Set in start work ioctl */ mutex_init(&ctx->mapping_lock); ctx->mapping = NULL; @@ -362,3 +364,22 @@ void cxl_context_mm_count_put(struct cxl_context *ctx) if (ctx->mm) mmdrop(ctx->mm); } + +int cxl_context_thread_tidr(struct cxl_context *ctx, int assign) +{ + int rc = 0; + + /* Clear any TIDR value assigned to the current thread */ + if (!assign) { + clear_thread_tidr(current); + ctx->tid = 0; + } else { + /* Assign a unique TIDR (thread id) for the current thread */ + rc = set_thread_tidr(current); + if (!rc) + ctx->tid = current->thread.tidr; + } + pr_devel("%s: current tidr: %d\n", __func__, ctx->tid); + + return rc; +} diff --git a/drivers/misc/cxl/cxl.h b/drivers/misc/cxl/cxl.h index e46a406..5f8678f 100644 --- a/drivers/misc/cxl/cxl.h +++ b/drivers/misc/cxl/cxl.h @@ -561,6 +561,7 @@ struct cxl_context { unsigned int sst_size, sst_lru; wait_queue_head_t wq; + u32 tid; /* use mm context associated with this pid for ds faults */ struct pid *pid; spinlock_t lock; /* Protects pending_irq_mask, pending_fault and fault_addr */ @@ -1169,4 +1170,9 @@ void cxl_context_mm_count_get(struct cxl_context *ctx); /* Decrements the reference count to "struct mm_struct" */ void cxl_context_mm_count_put(struct cxl_context *ctx); +/* Clear any TIDR value or assign a unique TIDR (thread id) for the + * current thread + */ +int cxl_context_thread_tidr(struct cxl_context *ctx, int assign); + #endif diff --git a/drivers/misc/cxl/cxllib.c b/drivers/misc/cxl/cxllib.c index dc9bc18..126d988 100644 --- a/drivers/misc/cxl/cxllib.c +++ b/drivers/misc/cxl/cxllib.c @@ -202,7 +202,7 @@ int cxllib_get_PE_attributes(struct task_struct *task, } else { attr->pid = 0; } - attr->tid = 0; + attr->tid = current->thread.tidr; return 0; } EXPORT_SYMBOL_GPL(cxllib_get_PE_attributes); diff --git a/drivers/misc/cxl/file.c b/drivers/misc/cxl/file.c index 76c0b0c..f0666ee 100644 --- a/drivers/misc/cxl/file.c +++ b/drivers/misc/cxl/file.c @@ -300,6 +300,17 @@ static long afu_ioctl_get_afu_id(struct cxl_context *ctx, return 0; } +static long afu_ioctl_thread_tidr(struct cxl_context *ctx, + int __user *uassign) +{ + int assign; + + if (copy_from_user(&assign, uassign, sizeof(assign))) + return -EFAULT; + + return cxl_context_thread_tidr(ctx, assign); +} + long afu_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct cxl_context *ctx = file->private_data; @@ -319,6 +330,8 @@ long afu_ioctl(struct file *file, unsigned int cmd, unsigned long arg) case CXL_IOCTL_GET_AFU_ID: return afu_ioctl_get_afu_id(ctx, (struct cxl_afu_id __user *) arg); + case CXL_IOCTL_THREAD_TIDR: + return afu_ioctl_thread_tidr(ctx, (int __user *)arg); } return -EINVAL; } diff --git a/drivers/misc/cxl/native.c b/drivers/misc/cxl/native.c index 02b6b45..657c4a9 100644 --- a/drivers/misc/cxl/native.c +++ b/drivers/misc/cxl/native.c @@ -673,7 +673,7 @@ static int process_element_entry_psl9(struct cxl_context *ctx, u64 wed, u64 amr) pid = ctx->mm->context.id; } - ctx->elem->common.tid = 0; + ctx->elem->common.tid = cpu_to_be32(ctx->tid); ctx->elem->common.pid = cpu_to_be32(pid); ctx->elem->sr = cpu_to_be64(calculate_sr(ctx)); diff --git a/include/uapi/misc/cxl.h b/include/uapi/misc/cxl.h index 49e8fd0..78b5eb5 100644 --- a/include/uapi/misc/cxl.h +++ b/include/uapi/misc/cxl.h @@ -81,7 +81,8 @@ struct cxl_adapter_image { /* AFU devices */ #define CXL_IOCTL_START_WORK _IOW(CXL_MAGIC, 0x00, struct cxl_ioctl_start_work) #define CXL_IOCTL_GET_PROCESS_ELEMENT _IOR(CXL_MAGIC, 0x01, __u32) -#define CXL_IOCTL_GET_AFU_ID _IOR(CXL_MAGIC, 0x02, struct cxl_afu_id) +#define CXL_IOCTL_GET_AFU_ID _IOR(CXL_MAGIC, 0x02, struct cxl_afu_id) +#define CXL_IOCTL_THREAD_TIDR _IOR(CXL_MAGIC, 0x03, int) /* adapter devices */ #define CXL_IOCTL_DOWNLOAD_IMAGE _IOW(CXL_MAGIC, 0x0A, struct cxl_adapter_image) #define CXL_IOCTL_VALIDATE_IMAGE _IOW(CXL_MAGIC, 0x0B, struct cxl_adapter_image) -- 2.7.4