From: "Alastair D'Silva" <alastair@au1.ibm.com> To: linuxppc-dev@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, mikey@neuling.org, vaibhav@linux.vnet.ibm.com, aneesh.kumar@linux.vnet.ibm.com, malat@debian.org, felix@linux.vnet.ibm.com, pombredanne@nexb.com, sukadev@linux.vnet.ibm.com, npiggin@gmail.com, gregkh@linuxfoundation.org, arnd@arndb.de, andrew.donnellan@au1.ibm.com, fbarrat@linux.vnet.ibm.com, corbet@lwn.net, "Alastair D'Silva" <alastair@d-silva.org> Subject: [PATCH v3 3/7] powerpc: use task_pid_nr() for TID allocation Date: Wed, 9 May 2018 10:42:08 +1000 [thread overview] Message-ID: <20180509004212.4506-4-alastair@au1.ibm.com> (raw) In-Reply-To: <20180509004212.4506-1-alastair@au1.ibm.com> From: Alastair D'Silva <alastair@d-silva.org> The current implementation of TID allocation, using a global IDR, may result in an errant process starving the system of available TIDs. Instead, use task_pid_nr(), as mentioned by the original author. The scenario described which prevented it's use is not applicable, as set_thread_tidr can only be called after the task struct has been populated. In the unlikely event that 2 threads share the TID and are waiting, one of the following cases will happen: 1. The correct thread is running, the wrong thread is not In this situation, the correct thread is woken and proceeds to pass it's condition check. 2. Neither threads are running In this situation, neither thread will be woken. When scheduled, the waiting threads will execute either a wait, which will return immediately, followed by a condition check, which will pass for the correct thread and fail for the wrong thread, or they will execute the condition check immediately. 3. The wrong thread is running, the correct thread is not The wrong thread will be woken, but will fail it's condition check and re-execute wait. The correct thread, when scheduled, will execute either it's condition check (which will pass), or wait, which returns immediately when called the first time after the thread is scheduled, followed by it's condition check (which will pass). 4. Both threads are running Both threads will be woken. The wrong thread will fail it's condition check and execute another wait, while the correct thread will pass it's condition check. Signed-off-by: Alastair D'Silva <alastair@d-silva.org> --- arch/powerpc/include/asm/switch_to.h | 1 - arch/powerpc/kernel/process.c | 97 +----------------------------------- 2 files changed, 1 insertion(+), 97 deletions(-) diff --git a/arch/powerpc/include/asm/switch_to.h b/arch/powerpc/include/asm/switch_to.h index be8c9fa23983..5b03d8a82409 100644 --- a/arch/powerpc/include/asm/switch_to.h +++ b/arch/powerpc/include/asm/switch_to.h @@ -94,6 +94,5 @@ static inline void clear_task_ebb(struct task_struct *t) extern int set_thread_uses_vas(void); extern int set_thread_tidr(struct task_struct *t); -extern void clear_thread_tidr(struct task_struct *t); #endif /* _ASM_POWERPC_SWITCH_TO_H */ diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 3b00da47699b..87f047fd2762 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1496,103 +1496,12 @@ int set_thread_uses_vas(void) } #ifdef CONFIG_PPC64 -static DEFINE_SPINLOCK(vas_thread_id_lock); -static DEFINE_IDA(vas_thread_ida); - -/* - * We need to assign a unique thread id to each thread in a process. - * - * This thread id, referred to as TIDR, and separate from the Linux's tgid, - * is intended to be used to direct an ASB_Notify from the hardware to the - * thread, when a suitable event occurs in the system. - * - * One such event is a "paste" instruction in the context of Fast Thread - * Wakeup (aka Core-to-core wake up in the Virtual Accelerator Switchboard - * (VAS) in POWER9. - * - * To get a unique TIDR per process we could simply reuse task_pid_nr() but - * the problem is that task_pid_nr() is not yet available copy_thread() is - * called. Fixing that would require changing more intrusive arch-neutral - * code in code path in copy_process()?. - * - * Further, to assign unique TIDRs within each process, we need an atomic - * field (or an IDR) in task_struct, which again intrudes into the arch- - * neutral code. So try to assign globally unique TIDRs for now. - * - * NOTE: TIDR 0 indicates that the thread does not need a TIDR value. - * For now, only threads that expect to be notified by the VAS - * hardware need a TIDR value and we assign values > 0 for those. - */ -#define MAX_THREAD_CONTEXT ((1 << 16) - 1) -static int assign_thread_tidr(void) -{ - int index; - int err; - unsigned long flags; - -again: - if (!ida_pre_get(&vas_thread_ida, GFP_KERNEL)) - return -ENOMEM; - - spin_lock_irqsave(&vas_thread_id_lock, flags); - err = ida_get_new_above(&vas_thread_ida, 1, &index); - spin_unlock_irqrestore(&vas_thread_id_lock, flags); - - if (err == -EAGAIN) - goto again; - else if (err) - return err; - - if (index > MAX_THREAD_CONTEXT) { - spin_lock_irqsave(&vas_thread_id_lock, flags); - ida_remove(&vas_thread_ida, index); - spin_unlock_irqrestore(&vas_thread_id_lock, flags); - return -ENOMEM; - } - - return index; -} - -static void free_thread_tidr(int id) -{ - unsigned long flags; - - spin_lock_irqsave(&vas_thread_id_lock, flags); - ida_remove(&vas_thread_ida, id); - spin_unlock_irqrestore(&vas_thread_id_lock, flags); -} - -/* - * Clear any TIDR value assigned to this thread. - */ -void clear_thread_tidr(struct task_struct *t) -{ - if (!t->thread.tidr) - return; - - if (!cpu_has_feature(CPU_FTR_P9_TIDR)) { - WARN_ON_ONCE(1); - return; - } - - mtspr(SPRN_TIDR, 0); - free_thread_tidr(t->thread.tidr); - t->thread.tidr = 0; -} - -void arch_release_task_struct(struct task_struct *t) -{ - clear_thread_tidr(t); -} - /* * Assign a unique TIDR (thread id) for task @t and set it in the thread * structure. For now, we only support setting TIDR for 'current' task. */ int set_thread_tidr(struct task_struct *t) { - int rc; - if (!cpu_has_feature(CPU_FTR_P9_TIDR)) return -EINVAL; @@ -1602,11 +1511,7 @@ int set_thread_tidr(struct task_struct *t) if (t->thread.tidr) return 0; - rc = assign_thread_tidr(); - if (rc < 0) - return rc; - - t->thread.tidr = rc; + t->thread.tidr = (u16)task_pid_nr(t); mtspr(SPRN_TIDR, t->thread.tidr); return 0; -- 2.14.3
WARNING: multiple messages have this Message-ID (diff)
From: "Alastair D'Silva" <alastair@au1.ibm.com> To: linuxppc-dev@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, mikey@neuling.org, vaibhav@linux.vnet.ibm.com, aneesh.kumar@linux.vnet.ibm.com, malat@debian.org, felix@linux.vnet.ibm.com, pombredanne@nexb.com, sukadev@linux.vnet.ibm.com, npiggin@gmail.com, gregkh@linuxfoundation.org, arnd@arndb.de, andrew.donnellan@au1.ibm.com, fbarrat@linux.vnet.ibm.com, corbet@lwn.net, "Alastair D'Silva" <alastair@d-silva.org> Subject: [PATCH v3 3/7] powerpc: use task_pid_nr() for TID allocation Date: Wed, 9 May 2018 10:42:08 +1000 [thread overview] Message-ID: <20180509004212.4506-4-alastair@au1.ibm.com> (raw) In-Reply-To: <20180509004212.4506-1-alastair@au1.ibm.com> From: Alastair D'Silva <alastair@d-silva.org> The current implementation of TID allocation, using a global IDR, may result in an errant process starving the system of available TIDs. Instead, use task_pid_nr(), as mentioned by the original author. The scenario described which prevented it's use is not applicable, as set_thread_tidr can only be called after the task struct has been populated. In the unlikely event that 2 threads share the TID and are waiting, one of the following cases will happen: 1. The correct thread is running, the wrong thread is not In this situation, the correct thread is woken and proceeds to pass it's condition check. 2. Neither threads are running In this situation, neither thread will be woken. When scheduled, the waiting threads will execute either a wait, which will return immediately, followed by a condition check, which will pass for the correct thread and fail for the wrong thread, or they will execute the condition check immediately. 3. The wrong thread is running, the correct thread is not The wrong thread will be woken, but will fail it's condition check and re-execute wait. The correct thread, when scheduled, will execute either it's condition check (which will pass), or wait, which returns immediately when called the first time after the thread is scheduled, followed by it's condition check (which will pass). 4. Both threads are running Both threads will be woken. The wrong thread will fail it's condition check and execute another wait, while the correct thread will pass it's condition check. Signed-off-by: Alastair D'Silva <alastair@d-silva.org> --- arch/powerpc/include/asm/switch_to.h | 1 - arch/powerpc/kernel/process.c | 97 +----------------------------------- 2 files changed, 1 insertion(+), 97 deletions(-) diff --git a/arch/powerpc/include/asm/switch_to.h b/arch/powerpc/include/asm/switch_to.h index be8c9fa23983..5b03d8a82409 100644 --- a/arch/powerpc/include/asm/switch_to.h +++ b/arch/powerpc/include/asm/switch_to.h @@ -94,6 +94,5 @@ static inline void clear_task_ebb(struct task_struct *t) extern int set_thread_uses_vas(void); extern int set_thread_tidr(struct task_struct *t); -extern void clear_thread_tidr(struct task_struct *t); #endif /* _ASM_POWERPC_SWITCH_TO_H */ diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 3b00da47699b..87f047fd2762 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1496,103 +1496,12 @@ int set_thread_uses_vas(void) } #ifdef CONFIG_PPC64 -static DEFINE_SPINLOCK(vas_thread_id_lock); -static DEFINE_IDA(vas_thread_ida); - -/* - * We need to assign a unique thread id to each thread in a process. - * - * This thread id, referred to as TIDR, and separate from the Linux's tgid, - * is intended to be used to direct an ASB_Notify from the hardware to the - * thread, when a suitable event occurs in the system. - * - * One such event is a "paste" instruction in the context of Fast Thread - * Wakeup (aka Core-to-core wake up in the Virtual Accelerator Switchboard - * (VAS) in POWER9. - * - * To get a unique TIDR per process we could simply reuse task_pid_nr() but - * the problem is that task_pid_nr() is not yet available copy_thread() is - * called. Fixing that would require changing more intrusive arch-neutral - * code in code path in copy_process()?. - * - * Further, to assign unique TIDRs within each process, we need an atomic - * field (or an IDR) in task_struct, which again intrudes into the arch- - * neutral code. So try to assign globally unique TIDRs for now. - * - * NOTE: TIDR 0 indicates that the thread does not need a TIDR value. - * For now, only threads that expect to be notified by the VAS - * hardware need a TIDR value and we assign values > 0 for those. - */ -#define MAX_THREAD_CONTEXT ((1 << 16) - 1) -static int assign_thread_tidr(void) -{ - int index; - int err; - unsigned long flags; - -again: - if (!ida_pre_get(&vas_thread_ida, GFP_KERNEL)) - return -ENOMEM; - - spin_lock_irqsave(&vas_thread_id_lock, flags); - err = ida_get_new_above(&vas_thread_ida, 1, &index); - spin_unlock_irqrestore(&vas_thread_id_lock, flags); - - if (err == -EAGAIN) - goto again; - else if (err) - return err; - - if (index > MAX_THREAD_CONTEXT) { - spin_lock_irqsave(&vas_thread_id_lock, flags); - ida_remove(&vas_thread_ida, index); - spin_unlock_irqrestore(&vas_thread_id_lock, flags); - return -ENOMEM; - } - - return index; -} - -static void free_thread_tidr(int id) -{ - unsigned long flags; - - spin_lock_irqsave(&vas_thread_id_lock, flags); - ida_remove(&vas_thread_ida, id); - spin_unlock_irqrestore(&vas_thread_id_lock, flags); -} - -/* - * Clear any TIDR value assigned to this thread. - */ -void clear_thread_tidr(struct task_struct *t) -{ - if (!t->thread.tidr) - return; - - if (!cpu_has_feature(CPU_FTR_P9_TIDR)) { - WARN_ON_ONCE(1); - return; - } - - mtspr(SPRN_TIDR, 0); - free_thread_tidr(t->thread.tidr); - t->thread.tidr = 0; -} - -void arch_release_task_struct(struct task_struct *t) -{ - clear_thread_tidr(t); -} - /* * Assign a unique TIDR (thread id) for task @t and set it in the thread * structure. For now, we only support setting TIDR for 'current' task. */ int set_thread_tidr(struct task_struct *t) { - int rc; - if (!cpu_has_feature(CPU_FTR_P9_TIDR)) return -EINVAL; @@ -1602,11 +1511,7 @@ int set_thread_tidr(struct task_struct *t) if (t->thread.tidr) return 0; - rc = assign_thread_tidr(); - if (rc < 0) - return rc; - - t->thread.tidr = rc; + t->thread.tidr = (u16)task_pid_nr(t); mtspr(SPRN_TIDR, t->thread.tidr); return 0; -- 2.14.3 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2018-05-09 0:42 UTC|newest] Thread overview: 119+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-04-17 2:09 [PATCH 0/7] ocxl: Implement Power9 as_notify/wait for OpenCAPI Alastair D'Silva 2018-04-17 2:09 ` Alastair D'Silva 2018-04-17 2:09 ` [PATCH 1/7] powerpc: Add TIDR CPU feature for Power9 Alastair D'Silva 2018-04-17 2:09 ` Alastair D'Silva 2018-04-17 4:09 ` Andrew Donnellan 2018-04-17 4:09 ` Andrew Donnellan 2018-04-17 2:09 ` [PATCH 2/7] powerpc: Use TIDR CPU feature to control TIDR allocation Alastair D'Silva 2018-04-17 2:09 ` Alastair D'Silva 2018-04-17 4:21 ` Andrew Donnellan 2018-04-17 4:21 ` Andrew Donnellan 2018-04-17 5:31 ` Alastair D'Silva 2018-04-17 5:31 ` Alastair D'Silva 2018-04-17 2:09 ` [PATCH 3/7] powerpc: use task_pid_nr() for TID allocation Alastair D'Silva 2018-04-17 2:09 ` Alastair D'Silva 2018-04-17 2:09 ` [PATCH 4/7] ocxl: Rename pnv_ocxl_spa_remove_pe to clarify it's action Alastair D'Silva 2018-04-17 2:09 ` Alastair D'Silva 2018-04-17 5:37 ` Andrew Donnellan 2018-04-17 5:37 ` Andrew Donnellan 2018-04-17 2:09 ` [PATCH 5/7] ocxl: Expose the thread_id needed for wait on p9 Alastair D'Silva 2018-04-17 2:09 ` Alastair D'Silva 2018-04-17 2:09 ` [PATCH 6/7] ocxl: Add an IOCTL so userspace knows which platform the kernel requires Alastair D'Silva 2018-04-17 2:09 ` Alastair D'Silva 2018-04-17 2:09 ` [PATCH 7/7] ocxl: Document new OCXL IOCTLs Alastair D'Silva 2018-04-17 2:09 ` Alastair D'Silva 2018-04-17 3:45 ` Andrew Donnellan 2018-04-17 3:45 ` Andrew Donnellan 2018-04-18 1:08 ` [PATCH v2 0/7] ocxl: Implement Power9 as_notify/wait for OpenCAPI Alastair D'Silva 2018-04-18 1:08 ` Alastair D'Silva 2018-04-18 1:08 ` [PATCH v2 1/7] powerpc: Add TIDR CPU feature for Power9 Alastair D'Silva 2018-04-18 1:08 ` Alastair D'Silva 2018-04-18 7:03 ` Andrew Donnellan 2018-04-18 7:03 ` Andrew Donnellan 2018-05-07 17:17 ` Frederic Barrat 2018-05-07 17:17 ` Frederic Barrat 2018-05-08 3:13 ` Alastair D'Silva 2018-05-08 3:13 ` Alastair D'Silva 2018-04-18 1:08 ` [PATCH v2 2/7] powerpc: Use TIDR CPU feature to control TIDR allocation Alastair D'Silva 2018-04-18 1:08 ` Alastair D'Silva 2018-04-18 7:13 ` Andrew Donnellan 2018-04-18 7:13 ` Andrew Donnellan 2018-05-07 17:19 ` Frederic Barrat 2018-05-07 17:19 ` Frederic Barrat 2018-04-18 1:08 ` [PATCH v2 3/7] powerpc: use task_pid_nr() for TID allocation Alastair D'Silva 2018-04-18 1:08 ` Alastair D'Silva 2018-04-20 8:43 ` Andrew Donnellan 2018-04-20 8:43 ` Andrew Donnellan 2018-04-24 21:12 ` Sukadev Bhattiprolu 2018-04-24 21:12 ` Sukadev Bhattiprolu 2018-04-26 9:25 ` Andrew Donnellan 2018-04-26 9:25 ` Andrew Donnellan 2018-05-07 17:37 ` Frederic Barrat 2018-05-07 17:37 ` Frederic Barrat 2018-05-08 0:40 ` Alastair D'Silva 2018-05-08 0:40 ` Alastair D'Silva 2018-04-18 1:08 ` [PATCH v2 4/7] ocxl: Rename pnv_ocxl_spa_remove_pe to clarify it's action Alastair D'Silva 2018-04-18 1:08 ` Alastair D'Silva 2018-05-07 17:38 ` Frederic Barrat 2018-05-07 17:38 ` Frederic Barrat 2018-04-18 1:08 ` [PATCH v2 5/7] ocxl: Expose the thread_id needed for wait on p9 Alastair D'Silva 2018-04-18 1:08 ` Alastair D'Silva 2018-04-23 7:16 ` Andrew Donnellan 2018-04-23 7:16 ` Andrew Donnellan 2018-05-07 18:08 ` Frederic Barrat 2018-05-07 18:08 ` Frederic Barrat 2018-04-18 1:08 ` [PATCH v2 6/7] ocxl: Add an IOCTL so userspace knows what CPU features are available Alastair D'Silva 2018-04-18 1:08 ` Alastair D'Silva 2018-04-20 7:25 ` Andrew Donnellan 2018-04-20 7:25 ` Andrew Donnellan 2018-05-07 18:14 ` Frederic Barrat 2018-05-07 18:14 ` Frederic Barrat 2018-05-08 0:41 ` Alastair D'Silva 2018-05-08 0:41 ` Alastair D'Silva 2018-05-08 3:50 ` Nicholas Piggin 2018-05-08 3:50 ` Nicholas Piggin 2018-05-08 3:54 ` Alastair D'Silva 2018-05-08 3:54 ` Alastair D'Silva 2018-04-18 1:08 ` [PATCH v2 7/7] ocxl: Document new OCXL IOCTLs Alastair D'Silva 2018-04-18 1:08 ` Alastair D'Silva 2018-04-18 7:29 ` Andrew Donnellan 2018-04-18 7:29 ` Andrew Donnellan 2018-05-07 18:15 ` Frederic Barrat 2018-05-07 18:15 ` Frederic Barrat 2018-05-09 0:42 ` [PATCH v3 0/7] ocxl: Implement Power9 as_notify/wait for OpenCAPI Alastair D'Silva 2018-05-09 0:42 ` Alastair D'Silva 2018-05-09 0:42 ` [PATCH v3 1/7] powerpc: Add TIDR CPU feature for POWER9 Alastair D'Silva 2018-05-09 0:42 ` Alastair D'Silva 2018-05-09 0:42 ` [PATCH v3 2/7] powerpc: Use TIDR CPU feature to control TIDR allocation Alastair D'Silva 2018-05-09 0:42 ` Alastair D'Silva 2018-05-09 0:42 ` Alastair D'Silva [this message] 2018-05-09 0:42 ` [PATCH v3 3/7] powerpc: use task_pid_nr() for TID allocation Alastair D'Silva 2018-05-09 0:42 ` [PATCH v3 4/7] ocxl: Rename pnv_ocxl_spa_remove_pe to clarify it's action Alastair D'Silva 2018-05-09 0:42 ` Alastair D'Silva 2018-05-09 0:42 ` [PATCH v3 5/7] ocxl: Expose the thread_id needed for wait on POWER9 Alastair D'Silva 2018-05-09 0:42 ` Alastair D'Silva 2018-05-11 5:01 ` Michael Ellerman 2018-05-11 5:01 ` Michael Ellerman 2018-05-09 0:42 ` [PATCH v3 6/7] ocxl: Add an IOCTL so userspace knows what OCXL features are available Alastair D'Silva 2018-05-09 0:42 ` Alastair D'Silva 2018-05-09 0:42 ` [PATCH v3 7/7] ocxl: Document new OCXL IOCTLs Alastair D'Silva 2018-05-09 0:42 ` Alastair D'Silva 2018-05-09 5:34 ` [PATCH v4 0/7] ocxl: Implement Power9 as_notify/wait for OpenCAPI Alastair D'Silva 2018-05-09 5:34 ` Alastair D'Silva 2018-05-09 5:35 ` [PATCH v4 1/7] powerpc: Add TIDR CPU feature for POWER9 Alastair D'Silva 2018-05-09 5:35 ` Alastair D'Silva 2018-05-09 5:35 ` [PATCH v4 2/7] powerpc: Use TIDR CPU feature to control TIDR allocation Alastair D'Silva 2018-05-09 5:35 ` Alastair D'Silva 2018-05-09 5:35 ` [PATCH v4 3/7] powerpc: use task_pid_nr() for TID allocation Alastair D'Silva 2018-05-09 5:35 ` Alastair D'Silva 2018-05-09 5:35 ` [PATCH v4 4/7] ocxl: Rename pnv_ocxl_spa_remove_pe to clarify it's action Alastair D'Silva 2018-05-09 5:35 ` Alastair D'Silva 2018-05-09 5:35 ` [PATCH v4 5/7] ocxl: Expose the thread_id needed for wait on POWER9 Alastair D'Silva 2018-05-09 5:35 ` Alastair D'Silva 2018-05-09 5:35 ` [PATCH v4 6/7] ocxl: Add an IOCTL so userspace knows what OCXL features are available Alastair D'Silva 2018-05-09 5:35 ` Alastair D'Silva 2018-05-11 5:20 ` Michael Ellerman 2018-05-11 5:20 ` Michael Ellerman 2018-05-11 5:20 ` Michael Ellerman 2018-05-09 5:35 ` [PATCH v4 7/7] ocxl: Document new OCXL IOCTLs Alastair D'Silva 2018-05-09 5:35 ` Alastair D'Silva
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