From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0FC84330B2D; Fri, 17 Oct 2025 15:53:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760716420; cv=none; b=DldC/87a/WqundTP3r3gKHgp2l5UvcVrsnu06D3nazOyf1pR5yCGCgfcxZaqe1ylCdBoWMzMp5ou3ZG6TSjFDNdC/0hVbOIv9+xbLh3HkZEngkV7hi9Mogj+A0OlTCvI4n/GphCookVTK1uM/lAm9TVsNc29P7JcKIg/fx0zvXo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760716420; c=relaxed/simple; bh=ftRJU+OfEupYlOdlI/3HXc8Hr5v7TxhY377PEUffm6Q=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Ewhbgb8ipJ+1hM0GN7cl83gl1aJUjp+9u0BXilDqyFyq3xwTcjFhRTn+H1mZ116X+3S3oyxsucy8/idBA/Rvhhm0Ng62WmvAgCP6/ckK5EN4p8BlaAsogl3oh4koCGVdxufOgUDzPEwHezCb7dOHmHoQKPRcm0kgAW/EU6ExmU8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=JumpGvPE; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="JumpGvPE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8AC68C4CEE7; Fri, 17 Oct 2025 15:53:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1760716419; bh=ftRJU+OfEupYlOdlI/3HXc8Hr5v7TxhY377PEUffm6Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JumpGvPErjxbQUkjMaN2Vco/H6la4gwn9Bbuuq2CHfTeDeZmxcPgwIGyp6aAeQ/mr pa0FDjmxnTxIwfs5t2NcuTErHKg+7UXu2yBI1gUSPAnsjUetFFlYbWmsJIYIhXLeSS WdhxAeDtubIDEZGM+bmOXFf6fL40lNAHCz2wJS2Q= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, John Garry , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 5.15 142/276] scsi: mvsas: Use sas_task_find_rq() for tagging Date: Fri, 17 Oct 2025 16:53:55 +0200 Message-ID: <20251017145147.666416195@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251017145142.382145055@linuxfoundation.org> References: <20251017145142.382145055@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: John Garry [ Upstream commit 2acf97f199f9eba8321390325519e9b6bff60108 ] The request associated with a SCSI command coming from the block layer has a unique tag, so use that when possible for getting a slot. Unfortunately we don't support reserved commands in the SCSI midlayer yet. As such, SMP tasks - as an example - will not have a request associated, so in the interim continue to manage those tags for that type of sas_task internally. We reserve an arbitrary 4 tags for these internal tags. Indeed, we already decrement MVS_RSVD_SLOTS by 2 for the shost can_queue when flag MVF_FLAG_SOC is set. This change was made in commit 20b09c2992fe ("[SCSI] mvsas: add support for 94xx; layout change; bug fixes"), but what those 2 slots are used for is not obvious. Also make the tag management functions static, where possible. Signed-off-by: John Garry Link: https://lore.kernel.org/r/1666091763-11023-8-git-send-email-john.garry@huawei.com Signed-off-by: Martin K. Petersen Stable-dep-of: 60cd16a3b743 ("scsi: mvsas: Fix use-after-free bugs in mvs_work_queue") Signed-off-by: Sasha Levin --- drivers/scsi/mvsas/mv_defs.h | 1 + drivers/scsi/mvsas/mv_init.c | 9 +++++---- drivers/scsi/mvsas/mv_sas.c | 35 ++++++++++++++++++++++------------- drivers/scsi/mvsas/mv_sas.h | 7 +------ 4 files changed, 29 insertions(+), 23 deletions(-) diff --git a/drivers/scsi/mvsas/mv_defs.h b/drivers/scsi/mvsas/mv_defs.h index 7123a2efbf583..8ef174cd4d374 100644 --- a/drivers/scsi/mvsas/mv_defs.h +++ b/drivers/scsi/mvsas/mv_defs.h @@ -40,6 +40,7 @@ enum driver_configuration { MVS_ATA_CMD_SZ = 96, /* SATA command table buffer size */ MVS_OAF_SZ = 64, /* Open address frame buffer size */ MVS_QUEUE_SIZE = 64, /* Support Queue depth */ + MVS_RSVD_SLOTS = 4, MVS_SOC_CAN_QUEUE = MVS_SOC_SLOTS - 2, }; diff --git a/drivers/scsi/mvsas/mv_init.c b/drivers/scsi/mvsas/mv_init.c index e2093e7637d82..5f217f9ab5223 100644 --- a/drivers/scsi/mvsas/mv_init.c +++ b/drivers/scsi/mvsas/mv_init.c @@ -142,7 +142,7 @@ static void mvs_free(struct mvs_info *mvi) scsi_host_put(mvi->shost); list_for_each_entry(mwq, &mvi->wq_list, entry) cancel_delayed_work(&mwq->work_q); - kfree(mvi->tags); + kfree(mvi->rsvd_tags); kfree(mvi); } @@ -284,7 +284,6 @@ static int mvs_alloc(struct mvs_info *mvi, struct Scsi_Host *shost) printk(KERN_DEBUG "failed to create dma pool %s.\n", pool_name); goto err_out; } - mvi->tags_num = slot_nr; return 0; err_out: @@ -367,8 +366,8 @@ static struct mvs_info *mvs_pci_alloc(struct pci_dev *pdev, mvi->sas = sha; mvi->shost = shost; - mvi->tags = kzalloc(MVS_CHIP_SLOT_SZ>>3, GFP_KERNEL); - if (!mvi->tags) + mvi->rsvd_tags = bitmap_zalloc(MVS_RSVD_SLOTS, GFP_KERNEL); + if (!mvi->rsvd_tags) goto err_out; if (MVS_CHIP_DISP->chip_ioremap(mvi)) @@ -469,6 +468,8 @@ static void mvs_post_sas_ha_init(struct Scsi_Host *shost, else can_queue = MVS_CHIP_SLOT_SZ; + can_queue -= MVS_RSVD_SLOTS; + shost->sg_tablesize = min_t(u16, SG_ALL, MVS_MAX_SG); shost->can_queue = can_queue; mvi->shost->cmd_per_lun = MVS_QUEUE_SIZE; diff --git a/drivers/scsi/mvsas/mv_sas.c b/drivers/scsi/mvsas/mv_sas.c index 3b4576dba590e..e79297395ac77 100644 --- a/drivers/scsi/mvsas/mv_sas.c +++ b/drivers/scsi/mvsas/mv_sas.c @@ -20,31 +20,34 @@ static int mvs_find_tag(struct mvs_info *mvi, struct sas_task *task, u32 *tag) return 0; } -void mvs_tag_clear(struct mvs_info *mvi, u32 tag) +static void mvs_tag_clear(struct mvs_info *mvi, u32 tag) { - void *bitmap = mvi->tags; + void *bitmap = mvi->rsvd_tags; clear_bit(tag, bitmap); } -void mvs_tag_free(struct mvs_info *mvi, u32 tag) +static void mvs_tag_free(struct mvs_info *mvi, u32 tag) { + if (tag >= MVS_RSVD_SLOTS) + return; + mvs_tag_clear(mvi, tag); } -void mvs_tag_set(struct mvs_info *mvi, unsigned int tag) +static void mvs_tag_set(struct mvs_info *mvi, unsigned int tag) { - void *bitmap = mvi->tags; + void *bitmap = mvi->rsvd_tags; set_bit(tag, bitmap); } -inline int mvs_tag_alloc(struct mvs_info *mvi, u32 *tag_out) +static int mvs_tag_alloc(struct mvs_info *mvi, u32 *tag_out) { unsigned int index, tag; - void *bitmap = mvi->tags; + void *bitmap = mvi->rsvd_tags; - index = find_first_zero_bit(bitmap, mvi->tags_num); + index = find_first_zero_bit(bitmap, MVS_RSVD_SLOTS); tag = index; - if (tag >= mvi->tags_num) + if (tag >= MVS_RSVD_SLOTS) return -SAS_QUEUE_FULL; mvs_tag_set(mvi, tag); *tag_out = tag; @@ -691,6 +694,7 @@ static int mvs_task_prep(struct sas_task *task, struct mvs_info *mvi, int is_tmf struct mvs_task_exec_info tei; struct mvs_slot_info *slot; u32 tag = 0xdeadbeef, n_elem = 0; + struct request *rq; int rc = 0; if (!dev->port) { @@ -755,9 +759,14 @@ static int mvs_task_prep(struct sas_task *task, struct mvs_info *mvi, int is_tmf n_elem = task->num_scatter; } - rc = mvs_tag_alloc(mvi, &tag); - if (rc) - goto err_out; + rq = sas_task_find_rq(task); + if (rq) { + tag = rq->tag + MVS_RSVD_SLOTS; + } else { + rc = mvs_tag_alloc(mvi, &tag); + if (rc) + goto err_out; + } slot = &mvi->slot_info[tag]; @@ -860,7 +869,7 @@ int mvs_queue_command(struct sas_task *task, gfp_t gfp_flags) static void mvs_slot_free(struct mvs_info *mvi, u32 rx_desc) { u32 slot_idx = rx_desc & RXQ_SLOT_MASK; - mvs_tag_clear(mvi, slot_idx); + mvs_tag_free(mvi, slot_idx); } static void mvs_slot_task_free(struct mvs_info *mvi, struct sas_task *task, diff --git a/drivers/scsi/mvsas/mv_sas.h b/drivers/scsi/mvsas/mv_sas.h index 8dd30f8b478ec..cba6e7667a7ba 100644 --- a/drivers/scsi/mvsas/mv_sas.h +++ b/drivers/scsi/mvsas/mv_sas.h @@ -370,8 +370,7 @@ struct mvs_info { u32 chip_id; const struct mvs_chip_info *chip; - int tags_num; - unsigned long *tags; + unsigned long *rsvd_tags; /* further per-slot information */ struct mvs_phy phy[MVS_MAX_PHYS]; struct mvs_port port[MVS_MAX_PHYS]; @@ -424,10 +423,6 @@ struct mvs_task_exec_info { /******************** function prototype *********************/ void mvs_get_sas_addr(void *buf, u32 buflen); -void mvs_tag_clear(struct mvs_info *mvi, u32 tag); -void mvs_tag_free(struct mvs_info *mvi, u32 tag); -void mvs_tag_set(struct mvs_info *mvi, unsigned int tag); -int mvs_tag_alloc(struct mvs_info *mvi, u32 *tag_out); void mvs_iounmap(void __iomem *regs); int mvs_ioremap(struct mvs_info *mvi, int bar, int bar_ex); void mvs_phys_reset(struct mvs_info *mvi, u32 phy_mask, int hard); -- 2.51.0