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Mon, 14 Oct 2024 08:26:11 -0700 (PDT) From: Roman Penyaev To: Cc: Roman Penyaev , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , qemu-devel@nongnu.org Subject: [PATCH v2 1/8] chardev/char: fix qemu_chr_is_busy() check Date: Mon, 14 Oct 2024 17:24:01 +0200 Message-Id: <20241014152408.427700-2-r.peniaev@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241014152408.427700-1-r.peniaev@gmail.com> References: <20241014152408.427700-1-r.peniaev@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::62f; envelope-from=r.peniaev@gmail.com; helo=mail-ej1-x62f.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1728919688176116600 `mux_cnt` struct member never goes negative or decrements, so mux chardev can be !busy only when there are no frontends attached. This patch fixes the always-true check. Fixes: a4afa548fc6d ("char: move front end handlers in CharBackend") Signed-off-by: Roman Penyaev Cc: "Marc-Andr=C3=A9 Lureau" Cc: qemu-devel@nongnu.org Reviewed-by: Marc-Andr=C3=A9 Lureau --- chardev/char.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/chardev/char.c b/chardev/char.c index c0cc52824b48..f54dc3a86286 100644 --- a/chardev/char.c +++ b/chardev/char.c @@ -333,7 +333,7 @@ static bool qemu_chr_is_busy(Chardev *s) { if (CHARDEV_IS_MUX(s)) { MuxChardev *d =3D MUX_CHARDEV(s); - return d->mux_cnt >=3D 0; + return d->mux_cnt > 0; } else { return s->be !=3D NULL; } --=20 2.34.1 From nobody Sat Nov 23 20:42:36 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=gmail.com ARC-Seal: i=1; a=rsa-sha256; t=1728919628; cv=none; d=zohomail.com; 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Signed-off-by: Roman Penyaev Cc: "Marc-Andr=C3=A9 Lureau" Cc: qemu-devel@nongnu.org Reviewed-by: Cl=C3=A9ment Mathieu--Drif Reviewed-by: Marc-Andr=C3=A9 Lureau --- chardev/chardev-internal.h | 1 - 1 file changed, 1 deletion(-) diff --git a/chardev/chardev-internal.h b/chardev/chardev-internal.h index 4e03af31476c..c3024b51fdda 100644 --- a/chardev/chardev-internal.h +++ b/chardev/chardev-internal.h @@ -40,7 +40,6 @@ struct MuxChardev { int focus; int mux_cnt; int term_got_escape; - int max_size; /* Intermediate input buffer catches escape sequences even if the currently active device is not accepting any input - but only until= it is full as well. */ --=20 2.34.1 From nobody Sat Nov 23 20:42:36 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=gmail.com ARC-Seal: i=1; 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charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::12f; envelope-from=r.peniaev@gmail.com; helo=mail-lf1-x12f.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1728919636035116600 Those are boolean variables, not signed integers. Signed-off-by: Roman Penyaev Cc: "Marc-Andr=C3=A9 Lureau" Cc: qemu-devel@nongnu.org Reviewed-by: Cl=C3=A9ment Mathieu--Drif Reviewed-by: Marc-Andr=C3=A9 Lureau --- chardev/char-mux.c | 10 +++++----- chardev/chardev-internal.h | 4 ++-- 2 files changed, 7 insertions(+), 7 deletions(-) diff --git a/chardev/char-mux.c b/chardev/char-mux.c index ee2d47b20d9b..728596c6f346 100644 --- a/chardev/char-mux.c +++ b/chardev/char-mux.c @@ -73,11 +73,11 @@ static int mux_chr_write(Chardev *chr, const uint8_t *b= uf, int len) * qemu_chr_fe_write and background I/O callbacks */ qemu_chr_fe_write_all(&d->chr, (uint8_t *)buf1, strlen(buf1)); - d->linestart =3D 0; + d->linestart =3D false; } ret +=3D qemu_chr_fe_write(&d->chr, buf + i, 1); if (buf[i] =3D=3D '\n') { - d->linestart =3D 1; + d->linestart =3D true; } } } @@ -145,7 +145,7 @@ static void mux_chr_be_event(Chardev *chr, QEMUChrEvent= event) static int mux_proc_byte(Chardev *chr, MuxChardev *d, int ch) { if (d->term_got_escape) { - d->term_got_escape =3D 0; + d->term_got_escape =3D false; if (ch =3D=3D term_escape_char) { goto send_char; } @@ -175,11 +175,11 @@ static int mux_proc_byte(Chardev *chr, MuxChardev *d,= int ch) case 't': d->timestamps =3D !d->timestamps; d->timestamps_start =3D -1; - d->linestart =3D 0; + d->linestart =3D false; break; } } else if (ch =3D=3D term_escape_char) { - d->term_got_escape =3D 1; + d->term_got_escape =3D true; } else { send_char: return 1; diff --git a/chardev/chardev-internal.h b/chardev/chardev-internal.h index c3024b51fdda..975c16de803e 100644 --- a/chardev/chardev-internal.h +++ b/chardev/chardev-internal.h @@ -39,7 +39,7 @@ struct MuxChardev { CharBackend chr; int focus; int mux_cnt; - int term_got_escape; + bool term_got_escape; /* Intermediate input buffer catches escape sequences even if the currently active device is not accepting any input - but only until= it is full as well. */ @@ -49,7 +49,7 @@ struct MuxChardev { int timestamps; =20 /* Protected by the Chardev chr_write_lock. */ - int linestart; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::634; envelope-from=r.peniaev@gmail.com; helo=mail-ej1-x634.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1728919666166116600 There is no sense to keep `focus`, `mux_cnt`, `prod`, `cons` and `tag` variables as signed, those represent either size, either position in array, which both are unsigned. `focus` member of `MuxChardev` is kept signed, because initially set to -1. Signed-off-by: Roman Penyaev Cc: "Marc-Andr=C3=A9 Lureau" Cc: qemu-devel@nongnu.org Reviewed-by: Marc-Andr=C3=A9 Lureau --- chardev/char-fe.c | 2 +- chardev/char-mux.c | 10 +++++----- chardev/chardev-internal.h | 8 ++++---- include/chardev/char-fe.h | 2 +- 4 files changed, 11 insertions(+), 11 deletions(-) diff --git a/chardev/char-fe.c b/chardev/char-fe.c index b214ba3802b1..69b47d16bdfa 100644 --- a/chardev/char-fe.c +++ b/chardev/char-fe.c @@ -191,7 +191,7 @@ bool qemu_chr_fe_backend_open(CharBackend *be) =20 bool qemu_chr_fe_init(CharBackend *b, Chardev *s, Error **errp) { - int tag =3D 0; + unsigned int tag =3D 0; =20 if (s) { if (CHARDEV_IS_MUX(s)) { diff --git a/chardev/char-mux.c b/chardev/char-mux.c index 728596c6f346..b2d7abf2fc01 100644 --- a/chardev/char-mux.c +++ b/chardev/char-mux.c @@ -124,7 +124,8 @@ static void mux_print_help(Chardev *chr) } } =20 -static void mux_chr_send_event(MuxChardev *d, int mux_nr, QEMUChrEvent eve= nt) +static void mux_chr_send_event(MuxChardev *d, unsigned int mux_nr, + QEMUChrEvent event) { CharBackend *be =3D d->backends[mux_nr]; =20 @@ -242,7 +243,7 @@ static void mux_chr_read(void *opaque, const uint8_t *b= uf, int size) void mux_chr_send_all_event(Chardev *chr, QEMUChrEvent event) { MuxChardev *d =3D MUX_CHARDEV(chr); - int i; + unsigned int i; =20 if (!muxes_opened) { return; @@ -275,7 +276,7 @@ static GSource *mux_chr_add_watch(Chardev *s, GIOCondit= ion cond) static void char_mux_finalize(Object *obj) { MuxChardev *d =3D MUX_CHARDEV(obj); - int i; + unsigned int i; =20 for (i =3D 0; i < d->mux_cnt; i++) { CharBackend *be =3D d->backends[i]; @@ -300,11 +301,10 @@ static void mux_chr_update_read_handlers(Chardev *chr) chr->gcontext, true, false); } =20 -void mux_set_focus(Chardev *chr, int focus) +void mux_set_focus(Chardev *chr, unsigned int focus) { MuxChardev *d =3D MUX_CHARDEV(chr); =20 - assert(focus >=3D 0); assert(focus < d->mux_cnt); =20 if (d->focus !=3D -1) { diff --git a/chardev/chardev-internal.h b/chardev/chardev-internal.h index 975c16de803e..ab93f6ea1720 100644 --- a/chardev/chardev-internal.h +++ b/chardev/chardev-internal.h @@ -38,14 +38,14 @@ struct MuxChardev { CharBackend *backends[MAX_MUX]; CharBackend chr; int focus; - int mux_cnt; + unsigned int mux_cnt; bool term_got_escape; /* Intermediate input buffer catches escape sequences even if the currently active device is not accepting any input - but only until= it is full as well. */ unsigned char buffer[MAX_MUX][MUX_BUFFER_SIZE]; - int prod[MAX_MUX]; - int cons[MAX_MUX]; + unsigned int prod[MAX_MUX]; + unsigned int cons[MAX_MUX]; int timestamps; =20 /* Protected by the Chardev chr_write_lock. */ @@ -59,7 +59,7 @@ DECLARE_INSTANCE_CHECKER(MuxChardev, MUX_CHARDEV, #define CHARDEV_IS_MUX(chr) \ object_dynamic_cast(OBJECT(chr), TYPE_CHARDEV_MUX) =20 -void mux_set_focus(Chardev *chr, int focus); +void mux_set_focus(Chardev *chr, unsigned int focus); void mux_chr_send_all_event(Chardev *chr, QEMUChrEvent event); =20 Object *get_chardevs_root(void); diff --git a/include/chardev/char-fe.h b/include/chardev/char-fe.h index 3310449eaf03..8ef05b3dd095 100644 --- a/include/chardev/char-fe.h +++ b/include/chardev/char-fe.h @@ -20,7 +20,7 @@ struct CharBackend { IOReadHandler *chr_read; BackendChangeHandler *chr_be_change; void *opaque; - int tag; + unsigned int tag; bool fe_is_open; }; =20 --=20 2.34.1 From nobody Sat Nov 23 20:42:36 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=gmail.com ARC-Seal: i=1; a=rsa-sha256; t=1728919628; cv=none; d=zohomail.com; s=zohoarc; b=Ext9jbSHfeNEYrTYWqec3hnvbivkCBpotoC9scHJ9g0GghqbYGld7KkjT2vKszBdEjt6M/QEpP415tn2c95zxa5eqfQ1CwApt5CyFlnh89qlg9yzi3q2Ifq7D4pndKqgmrtHENOLsbwWV4vw1V+Yp4dSqV6VUsmYgUY3UEcYlmM= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1728919628; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:Message-Id:Reply-To:To; 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AJvYcCWs0X5lypZOaavbsCYaVSNs04iT3r8d7jJtaYtpEl/9O8qcnmEzMpJyskzQe6yjuMddX9UC0gzf5NEc@nongnu.org X-Gm-Message-State: AOJu0YwxikNop3+mCQ2LPzCye+pk11hF+MY0qj4mPABfENVltdTd4PZT +2UV4yNEOLteOk75gQoF6B4b988hKf82O2zqVsQUvb7vdxzJISWE X-Google-Smtp-Source: AGHT+IEjynpc7uLVbU+yD65ufXEqkRz1AyV7qgrSVykOCB69OQxFw23zt3nWmRr/RKVZYsCHirtodg== X-Received: by 2002:a17:907:7296:b0:a99:e4a2:1cda with SMTP id a640c23a62f3a-a99e4a21d75mr803489266b.56.1728919573710; Mon, 14 Oct 2024 08:26:13 -0700 (PDT) From: Roman Penyaev To: Cc: Roman Penyaev , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , qemu-devel@nongnu.org Subject: [PATCH v2 5/8] chardev/mux: introduce `mux_chr_attach_frontend() call Date: Mon, 14 Oct 2024 17:24:05 +0200 Message-Id: <20241014152408.427700-6-r.peniaev@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241014152408.427700-1-r.peniaev@gmail.com> References: <20241014152408.427700-1-r.peniaev@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::634; envelope-from=r.peniaev@gmail.com; helo=mail-ej1-x634.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1728919629937116600 Move away logic which attaches frontend device to a mux from `char-fe.c` to actual `char-mux.c` implementation and make it a separate function. No logic changes are made. Signed-off-by: Roman Penyaev Cc: "Marc-Andr=C3=A9 Lureau" Cc: qemu-devel@nongnu.org Reviewed-by: Marc-Andr=C3=A9 Lureau --- chardev/char-fe.c | 9 +-------- chardev/char-mux.c | 17 +++++++++++++++++ chardev/chardev-internal.h | 2 ++ 3 files changed, 20 insertions(+), 8 deletions(-) diff --git a/chardev/char-fe.c b/chardev/char-fe.c index 69b47d16bdfa..3b8771ca2ac4 100644 --- a/chardev/char-fe.c +++ b/chardev/char-fe.c @@ -197,16 +197,9 @@ bool qemu_chr_fe_init(CharBackend *b, Chardev *s, Erro= r **errp) if (CHARDEV_IS_MUX(s)) { MuxChardev *d =3D MUX_CHARDEV(s); =20 - if (d->mux_cnt >=3D MAX_MUX) { - error_setg(errp, - "too many uses of multiplexed chardev '%s'" - " (maximum is " stringify(MAX_MUX) ")", - s->label); + if (!mux_chr_attach_frontend(d, b, &tag, errp)) { return false; } - - d->backends[d->mux_cnt] =3D b; - tag =3D d->mux_cnt++; } else if (s->be) { error_setg(errp, "chardev '%s' is already in use", s->label); return false; diff --git a/chardev/char-mux.c b/chardev/char-mux.c index b2d7abf2fc01..9294f955462e 100644 --- a/chardev/char-mux.c +++ b/chardev/char-mux.c @@ -301,6 +301,23 @@ static void mux_chr_update_read_handlers(Chardev *chr) chr->gcontext, true, false); } =20 +bool mux_chr_attach_frontend(MuxChardev *d, CharBackend *b, + unsigned int *tag, Error **errp) +{ + if (d->mux_cnt >=3D MAX_MUX) { + error_setg(errp, + "too many uses of multiplexed chardev '%s'" + " (maximum is " stringify(MAX_MUX) ")", + d->parent.label); + return false; + } + + d->backends[d->mux_cnt] =3D b; + *tag =3D d->mux_cnt++; + + return true; +} + void mux_set_focus(Chardev *chr, unsigned int focus) { MuxChardev *d =3D MUX_CHARDEV(chr); diff --git a/chardev/chardev-internal.h b/chardev/chardev-internal.h index ab93f6ea1720..8126ce180690 100644 --- a/chardev/chardev-internal.h +++ b/chardev/chardev-internal.h @@ -59,6 +59,8 @@ DECLARE_INSTANCE_CHECKER(MuxChardev, MUX_CHARDEV, #define CHARDEV_IS_MUX(chr) \ object_dynamic_cast(OBJECT(chr), TYPE_CHARDEV_MUX) =20 +bool mux_chr_attach_frontend(MuxChardev *d, CharBackend *b, + unsigned int *tag, Error **errp); void mux_set_focus(Chardev *chr, unsigned int focus); void mux_chr_send_all_event(Chardev *chr, QEMUChrEvent event); 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Mon, 14 Oct 2024 08:26:14 -0700 (PDT) From: Roman Penyaev To: Cc: Roman Penyaev , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , qemu-devel@nongnu.org Subject: [PATCH v2 6/8] chardev/mux: switch mux frontends management to bitset Date: Mon, 14 Oct 2024 17:24:06 +0200 Message-Id: <20241014152408.427700-7-r.peniaev@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241014152408.427700-1-r.peniaev@gmail.com> References: <20241014152408.427700-1-r.peniaev@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::633; envelope-from=r.peniaev@gmail.com; helo=mail-ej1-x633.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1728919631896116600 Frontends can be attached and detached during run-time (although detach is not implemented, but will follow). Counter variable of muxes is not enough for proper attach/detach management, so this patch implements bitset: if bit is set for the `mux_bitset` variable, then frontend device can be found in the `backend` array (yes, huge confusion with backend and frontends names). Signed-off-by: Roman Penyaev Cc: "Marc-Andr=C3=A9 Lureau" Cc: qemu-devel@nongnu.org Reviewed-by: Marc-Andr=C3=A9 Lureau --- chardev/char-mux.c | 42 +++++++++++++++++++++++++------------- chardev/char.c | 2 +- chardev/chardev-internal.h | 2 +- 3 files changed, 30 insertions(+), 16 deletions(-) diff --git a/chardev/char-mux.c b/chardev/char-mux.c index 9294f955462e..4fc619b2da70 100644 --- a/chardev/char-mux.c +++ b/chardev/char-mux.c @@ -26,6 +26,7 @@ #include "qapi/error.h" #include "qemu/module.h" #include "qemu/option.h" +#include "qemu/bitops.h" #include "chardev/char.h" #include "sysemu/block-backend.h" #include "qapi/qapi-commands-control.h" @@ -168,12 +169,19 @@ static int mux_proc_byte(Chardev *chr, MuxChardev *d,= int ch) case 'b': qemu_chr_be_event(chr, CHR_EVENT_BREAK); break; - case 'c': - assert(d->mux_cnt > 0); /* handler registered with first fe */ + case 'c': { + unsigned int bit; + + /* Handler registered with first fe */ + assert(d->mux_bitset !=3D 0); /* Switch to the next registered device */ - mux_set_focus(chr, (d->focus + 1) % d->mux_cnt); + bit =3D find_next_bit(&d->mux_bitset, MAX_MUX, d->focus + 1); + if (bit >=3D MAX_MUX) { + bit =3D find_next_bit(&d->mux_bitset, MAX_MUX, 0); + } + mux_set_focus(chr, bit); break; - case 't': + } case 't': d->timestamps =3D !d->timestamps; d->timestamps_start =3D -1; d->linestart =3D false; @@ -243,15 +251,16 @@ static void mux_chr_read(void *opaque, const uint8_t = *buf, int size) void mux_chr_send_all_event(Chardev *chr, QEMUChrEvent event) { MuxChardev *d =3D MUX_CHARDEV(chr); - unsigned int i; + int bit; =20 if (!muxes_opened) { return; } =20 /* Send the event to all registered listeners */ - for (i =3D 0; i < d->mux_cnt; i++) { - mux_chr_send_event(d, i, event); + bit =3D -1; + while ((bit =3D find_next_bit(&d->mux_bitset, MAX_MUX, bit + 1)) < MAX= _MUX) { + mux_chr_send_event(d, bit, event); } } =20 @@ -276,10 +285,11 @@ static GSource *mux_chr_add_watch(Chardev *s, GIOCond= ition cond) static void char_mux_finalize(Object *obj) { MuxChardev *d =3D MUX_CHARDEV(obj); - unsigned int i; + int bit; =20 - for (i =3D 0; i < d->mux_cnt; i++) { - CharBackend *be =3D d->backends[i]; + bit =3D -1; + while ((bit =3D find_next_bit(&d->mux_bitset, MAX_MUX, bit + 1)) < MAX= _MUX) { + CharBackend *be =3D d->backends[bit]; if (be) { be->chr =3D NULL; } @@ -304,7 +314,10 @@ static void mux_chr_update_read_handlers(Chardev *chr) bool mux_chr_attach_frontend(MuxChardev *d, CharBackend *b, unsigned int *tag, Error **errp) { - if (d->mux_cnt >=3D MAX_MUX) { + unsigned int bit; + + bit =3D find_next_zero_bit(&d->mux_bitset, MAX_MUX, 0); + if (bit >=3D MAX_MUX) { error_setg(errp, "too many uses of multiplexed chardev '%s'" " (maximum is " stringify(MAX_MUX) ")", @@ -312,8 +325,9 @@ bool mux_chr_attach_frontend(MuxChardev *d, CharBackend= *b, return false; } =20 - d->backends[d->mux_cnt] =3D b; - *tag =3D d->mux_cnt++; + d->mux_bitset |=3D (1 << bit); + d->backends[bit] =3D b; + *tag =3D bit; =20 return true; } @@ -322,7 +336,7 @@ void mux_set_focus(Chardev *chr, unsigned int focus) { MuxChardev *d =3D MUX_CHARDEV(chr); =20 - assert(focus < d->mux_cnt); + assert(find_next_bit(&d->mux_bitset, MAX_MUX, focus) =3D=3D focus); =20 if (d->focus !=3D -1) { mux_chr_send_event(d, d->focus, CHR_EVENT_MUX_OUT); diff --git a/chardev/char.c b/chardev/char.c index f54dc3a86286..a1722aa076d9 100644 --- a/chardev/char.c +++ b/chardev/char.c @@ -333,7 +333,7 @@ static bool qemu_chr_is_busy(Chardev *s) { if (CHARDEV_IS_MUX(s)) { MuxChardev *d =3D MUX_CHARDEV(s); - return d->mux_cnt > 0; + return d->mux_bitset !=3D 0; } else { return s->be !=3D NULL; } diff --git a/chardev/chardev-internal.h b/chardev/chardev-internal.h index 8126ce180690..b89aada5413b 100644 --- a/chardev/chardev-internal.h +++ b/chardev/chardev-internal.h @@ -37,8 +37,8 @@ struct MuxChardev { Chardev parent; CharBackend *backends[MAX_MUX]; CharBackend chr; + unsigned long mux_bitset; int focus; - unsigned int mux_cnt; bool term_got_escape; /* Intermediate input buffer catches escape sequences even if the currently active device is not accepting any input - but only until= it --=20 2.34.1 From nobody Sat Nov 23 20:42:36 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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Mon, 14 Oct 2024 08:26:15 -0700 (PDT) From: Roman Penyaev To: Cc: Roman Penyaev , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , qemu-devel@nongnu.org Subject: [PATCH v2 7/8] chardev/mux: implement detach of frontends from mux Date: Mon, 14 Oct 2024 17:24:07 +0200 Message-Id: <20241014152408.427700-8-r.peniaev@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241014152408.427700-1-r.peniaev@gmail.com> References: <20241014152408.427700-1-r.peniaev@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::62c; envelope-from=r.peniaev@gmail.com; helo=mail-ej1-x62c.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1728919678158116600 With bitset management now it becomes feasible to implement the logic of detaching frontends from multiplexer. Signed-off-by: Roman Penyaev Cc: "Marc-Andr=C3=A9 Lureau" Cc: qemu-devel@nongnu.org Reviewed-by: Marc-Andr=C3=A9 Lureau --- chardev/char-fe.c | 2 +- chardev/char-mux.c | 21 ++++++++++++++++++--- chardev/chardev-internal.h | 1 + 3 files changed, 20 insertions(+), 4 deletions(-) diff --git a/chardev/char-fe.c b/chardev/char-fe.c index 3b8771ca2ac4..8ac6bebb6f74 100644 --- a/chardev/char-fe.c +++ b/chardev/char-fe.c @@ -225,7 +225,7 @@ void qemu_chr_fe_deinit(CharBackend *b, bool del) } if (CHARDEV_IS_MUX(b->chr)) { MuxChardev *d =3D MUX_CHARDEV(b->chr); - d->backends[b->tag] =3D NULL; + mux_chr_detach_frontend(d, b->tag); } if (del) { Object *obj =3D OBJECT(b->chr); diff --git a/chardev/char-mux.c b/chardev/char-mux.c index 4fc619b2da70..bda5c45e6058 100644 --- a/chardev/char-mux.c +++ b/chardev/char-mux.c @@ -290,10 +290,10 @@ static void char_mux_finalize(Object *obj) bit =3D -1; while ((bit =3D find_next_bit(&d->mux_bitset, MAX_MUX, bit + 1)) < MAX= _MUX) { CharBackend *be =3D d->backends[bit]; - if (be) { - be->chr =3D NULL; - } + be->chr =3D NULL; + d->backends[bit] =3D NULL; } + d->mux_bitset =3D 0; qemu_chr_fe_deinit(&d->chr, false); } =20 @@ -332,6 +332,21 @@ bool mux_chr_attach_frontend(MuxChardev *d, CharBacken= d *b, return true; } =20 +bool mux_chr_detach_frontend(MuxChardev *d, unsigned int tag) +{ + unsigned int bit; + + bit =3D find_next_bit(&d->mux_bitset, MAX_MUX, tag); + if (bit !=3D tag) { + return false; + } + + d->mux_bitset &=3D ~(1 << bit); + d->backends[bit] =3D NULL; + + return true; +} + void mux_set_focus(Chardev *chr, unsigned int focus) { MuxChardev *d =3D MUX_CHARDEV(chr); diff --git a/chardev/chardev-internal.h b/chardev/chardev-internal.h index b89aada5413b..853807f3cb88 100644 --- a/chardev/chardev-internal.h +++ b/chardev/chardev-internal.h @@ -61,6 +61,7 @@ DECLARE_INSTANCE_CHECKER(MuxChardev, MUX_CHARDEV, =20 bool mux_chr_attach_frontend(MuxChardev *d, CharBackend *b, unsigned int *tag, Error **errp); +bool mux_chr_detach_frontend(MuxChardev *d, unsigned int tag); 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AJvYcCWftznYq7lLY084GEx5WTWVrMDFNzzAxhuOyjCQT75i5QILRQIQ3la8Tb99QdI0UdRDaNt66oTGt2am@nongnu.org X-Gm-Message-State: AOJu0YwkTXLiWr23Nv+EyzCPG461msNduDabfIsyKXbYbDz6OIX/84K2 gve58MDWlIfohfn6ii3P5pslTyj7hadpW95EvgInPuG9I3SQKnsW9w2m4Q== X-Google-Smtp-Source: AGHT+IHCOPZH9o0oJOAmtTOxYL3dSlzfMHZ27dFbAyKyjaSYxeLcfQa2M04Ak1OI8w4o5mtHu/0adA== X-Received: by 2002:a05:6512:3ba5:b0:52e:936e:a237 with SMTP id 2adb3069b0e04-539e54e74f6mr4398904e87.16.1728919576245; Mon, 14 Oct 2024 08:26:16 -0700 (PDT) From: Roman Penyaev To: Cc: Roman Penyaev , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , qemu-devel@nongnu.org Subject: [PATCH v2 8/8] tests/unit/test-char: implement a few mux remove test cases Date: Mon, 14 Oct 2024 17:24:08 +0200 Message-Id: <20241014152408.427700-9-r.peniaev@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241014152408.427700-1-r.peniaev@gmail.com> References: <20241014152408.427700-1-r.peniaev@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::132; envelope-from=r.peniaev@gmail.com; helo=mail-lf1-x132.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1728919650062116600 This patch tests: 1. feasibility of removing mux which does not have frontends attached or frontends were prior detached. 2. inability to remove mux which has frontends attached (mux is "busy") Signed-off-by: Roman Penyaev Cc: "Marc-Andr=C3=A9 Lureau" Cc: qemu-devel@nongnu.org Reviewed-by: Marc-Andr=C3=A9 Lureau --- tests/unit/test-char.c | 24 +++++++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-) diff --git a/tests/unit/test-char.c b/tests/unit/test-char.c index f273ce522612..2837dbb863a8 100644 --- a/tests/unit/test-char.c +++ b/tests/unit/test-char.c @@ -1,6 +1,7 @@ #include "qemu/osdep.h" #include =20 +#include "qapi/error.h" #include "qemu/config-file.h" #include "qemu/module.h" #include "qemu/option.h" @@ -184,6 +185,21 @@ static void char_mux_test(void) char *data; FeHandler h1 =3D { 0, false, 0, false, }, h2 =3D { 0, false, 0, false,= }; CharBackend chr_be1, chr_be2; + Error *error =3D NULL; + + /* Create mux and chardev to be immediately removed */ + opts =3D qemu_opts_create(qemu_find_opts("chardev"), "mux-label", + 1, &error_abort); + qemu_opt_set(opts, "backend", "ringbuf", &error_abort); + qemu_opt_set(opts, "size", "128", &error_abort); + qemu_opt_set(opts, "mux", "on", &error_abort); + chr =3D qemu_chr_new_from_opts(opts, NULL, &error_abort); + g_assert_nonnull(chr); + qemu_opts_del(opts); + + /* Remove just created mux and chardev */ + qmp_chardev_remove("mux-label", &error_abort); + qmp_chardev_remove("mux-label-base", &error_abort); =20 opts =3D qemu_opts_create(qemu_find_opts("chardev"), "mux-label", 1, &error_abort); @@ -334,7 +350,13 @@ static void char_mux_test(void) g_free(data); =20 qemu_chr_fe_deinit(&chr_be1, false); - qemu_chr_fe_deinit(&chr_be2, true); + + error =3D NULL; + qmp_chardev_remove("mux-label", &error); + g_assert_cmpstr(error_get_pretty(error), =3D=3D, "Chardev 'mux-label' = is busy"); + + qemu_chr_fe_deinit(&chr_be2, false); + qmp_chardev_remove("mux-label", &error_abort); } =20 =20 --=20 2.34.1