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Fri, 30 May 2025 02:31:30 -0700 (PDT) From: Bo Li To: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, luto@kernel.org, kees@kernel.org, akpm@linux-foundation.org, david@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, peterz@infradead.org Cc: dietmar.eggemann@arm.com, hpa@zytor.com, acme@kernel.org, namhyung@kernel.org, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, jolsa@kernel.org, irogers@google.com, adrian.hunter@intel.com, kan.liang@linux.intel.com, viro@zeniv.linux.org.uk, brauner@kernel.org, jack@suse.cz, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, jannh@google.com, pfalcato@suse.de, riel@surriel.com, harry.yoo@oracle.com, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, duanxiongchun@bytedance.com, yinhongbo@bytedance.com, dengliang.1214@bytedance.com, xieyongji@bytedance.com, chaiwen.cc@bytedance.com, songmuchun@bytedance.com, yuanzhu@bytedance.com, chengguozhu@bytedance.com, sunjiadong.lff@bytedance.com, Bo Li Subject: [RFC v2 12/35] RPAL: enable service disable notification Date: Fri, 30 May 2025 17:27:40 +0800 Message-Id: <20a49e36e1efc99b1489d81eb7b5fe8787fcee4c.1748594840.git.libo.gcs85@bytedance.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When a service is disabled, all services that request this service need to be notified. This patch use poll functions of file to implement such notification. When a service is disabled, it will notify all services that request it by set bit in others services' dead_key_bitmap. And the poll function will then issue a poll epoll event, other services can aware the service has been disabled. The key of disabled service can be read from the proc file. Signed-off-by: Bo Li --- arch/x86/rpal/proc.c | 61 +++++++++++++++++++++++++++++++++++++++++ arch/x86/rpal/service.c | 37 +++++++++++++++++++++++-- include/linux/rpal.h | 10 +++++++ 3 files changed, 106 insertions(+), 2 deletions(-) diff --git a/arch/x86/rpal/proc.c b/arch/x86/rpal/proc.c index f001afd40562..16ac9612bfc5 100644 --- a/arch/x86/rpal/proc.c +++ b/arch/x86/rpal/proc.c @@ -8,6 +8,7 @@ =20 #include #include +#include =20 #include "internal.h" =20 @@ -82,10 +83,70 @@ static long rpal_ioctl(struct file *file, unsigned int = cmd, unsigned long arg) return ret; } =20 +static ssize_t rpal_read(struct file *file, char __user *buf, size_t count, + loff_t *pos) +{ + struct rpal_service *cur =3D rpal_current_service(); + struct rpal_poll_data *rpd; + u64 released_keys[MAX_REQUEST_SERVICE]; + unsigned long flags; + int nr_key =3D 0; + int nr_byte =3D 0; + int idx; + + if (!cur) + return -EINVAL; + + rpd =3D &cur->rpd; + + spin_lock_irqsave(&rpd->poll_lock, flags); + idx =3D find_first_bit(rpd->dead_key_bitmap, RPAL_NR_ID); + while (idx < RPAL_NR_ID) { + released_keys[nr_key++] =3D rpd->dead_keys[idx]; + idx =3D find_next_bit(rpd->dead_key_bitmap, RPAL_NR_ID, idx + 1); + } + spin_unlock_irqrestore(&rpd->poll_lock, flags); + nr_byte =3D nr_key * sizeof(u64); + + if (copy_to_user(buf, released_keys, nr_byte)) { + nr_byte =3D -EAGAIN; + goto out; + } +out: + return nr_byte; +} + +static __poll_t rpal_poll(struct file *filep, struct poll_table_struct *wa= it) +{ + struct rpal_service *cur =3D rpal_current_service(); + struct rpal_poll_data *rpd; + unsigned long flags; + __poll_t mask =3D 0; + + if (unlikely(!cur)) { + rpal_err("Not a rpal service\n"); + goto out; + } + + rpd =3D &cur->rpd; + + poll_wait(filep, &rpd->rpal_waitqueue, wait); + + spin_lock_irqsave(&rpd->poll_lock, flags); + if (find_first_bit(rpd->dead_key_bitmap, RPAL_NR_ID) < RPAL_NR_ID) + mask |=3D EPOLLIN | EPOLLRDNORM; + spin_unlock_irqrestore(&rpd->poll_lock, flags); + +out: + return mask; +} + const struct proc_ops proc_rpal_operations =3D { .proc_open =3D rpal_open, + .proc_read =3D rpal_read, .proc_ioctl =3D rpal_ioctl, .proc_mmap =3D rpal_mmap, + .proc_poll =3D rpal_poll, }; =20 static int __init proc_rpal_init(void) diff --git a/arch/x86/rpal/service.c b/arch/x86/rpal/service.c index 16a2155873a1..f490ab07301d 100644 --- a/arch/x86/rpal/service.c +++ b/arch/x86/rpal/service.c @@ -181,6 +181,9 @@ struct rpal_service *rpal_register_service(void) atomic_set(&rs->req_avail_cnt, MAX_REQUEST_SERVICE); bitmap_zero(rs->requested_service_bitmap, RPAL_NR_ID); spin_lock_init(&rs->lock); + spin_lock_init(&rs->rpd.poll_lock); + bitmap_zero(rs->rpd.dead_key_bitmap, RPAL_NR_ID); + init_waitqueue_head(&rs->rpd.rpal_waitqueue); =20 rs->bad_service =3D false; rs->base =3D calculate_base_address(rs->id); @@ -296,6 +299,7 @@ static void remove_mapped_service(struct rpal_service *= rs, int id, int type_bit) =20 clear_bit(type_bit, &node->type); if (type_bit =3D=3D RPAL_REQUEST_MAP) { + clear_bit(id, rs->rpd.dead_key_bitmap); clear_requested_service_bitmap(rs, id); atomic_inc(&rs->req_avail_cnt); } @@ -424,15 +428,30 @@ static int release_service(struct rpal_service *cur, = struct rpal_service *tgt) return 0; } =20 +static void rpal_notify_disable(struct rpal_poll_data *rpd, u64 key, int i= d) +{ + unsigned long flags; + bool need_wake =3D false; + + spin_lock_irqsave(&rpd->poll_lock, flags); + if (!test_bit(id, rpd->dead_key_bitmap)) { + need_wake =3D true; + rpd->dead_keys[id] =3D key; + set_bit(id, rpd->dead_key_bitmap); + } + spin_unlock_irqrestore(&rpd->poll_lock, flags); + if (need_wake) + wake_up_interruptible(&rpd->rpal_waitqueue); +} + static void rpal_release_service_all(void) { struct rpal_service *cur =3D rpal_current_service(); struct rpal_service *tgt; + struct rpal_mapped_service *node; int ret, i; =20 rpal_for_each_requested_service(cur, i) { - struct rpal_mapped_service *node; - if (i =3D=3D cur->id) continue; node =3D rpal_get_mapped_node(cur, i); @@ -449,6 +468,20 @@ static void rpal_release_service_all(void) } rpal_put_service(tgt); } + + for (i =3D 0; i < RPAL_NR_ID; i++) { + if (i =3D=3D cur->id) + continue; + + node =3D rpal_get_mapped_node(cur, i); + tgt =3D rpal_get_service(node->rs); + if (!tgt) + continue; + + if (test_bit(RPAL_REVERSE_MAP, &node->type)) + rpal_notify_disable(&tgt->rpd, cur->key, cur->id); + rpal_put_service(tgt); + } } =20 int rpal_release_service(u64 key) diff --git a/include/linux/rpal.h b/include/linux/rpal.h index 1fe177523a36..b9622f0235bf 100644 --- a/include/linux/rpal.h +++ b/include/linux/rpal.h @@ -107,6 +107,13 @@ struct rpal_mapped_service { struct rpal_service *rs; }; =20 +struct rpal_poll_data { + spinlock_t poll_lock; + u64 dead_keys[RPAL_NR_ID]; + DECLARE_BITMAP(dead_key_bitmap, RPAL_NR_ID); + wait_queue_head_t rpal_waitqueue; +}; + /* * Each RPAL process (a.k.a RPAL service) should have a pointer to * struct rpal_service in all its tasks' task_struct. @@ -161,6 +168,9 @@ struct rpal_service { struct rpal_mapped_service service_map[RPAL_NR_ID]; DECLARE_BITMAP(requested_service_bitmap, RPAL_NR_ID); =20 + /* Notify service is released by others */ + struct rpal_poll_data rpd; + /* delayed service put work */ struct delayed_work delayed_put_work; =20 --=20 2.20.1