From patchwork Fri Mar 24 04:50:17 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kai-Heng Feng X-Patchwork-Id: 743055 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from huckleberry.canonical.com (huckleberry.canonical.com [91.189.94.19]) by ozlabs.org (Postfix) with ESMTP id 3vq9wK15dvz9s83; Fri, 24 Mar 2017 15:50:41 +1100 (AEDT) Received: from localhost ([127.0.0.1] helo=huckleberry.canonical.com) by huckleberry.canonical.com with esmtp (Exim 4.76) (envelope-from ) id 1crHBM-00036s-EI; Fri, 24 Mar 2017 04:50:36 +0000 Received: from youngberry.canonical.com ([91.189.89.112]) by huckleberry.canonical.com with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.76) (envelope-from ) id 1crHBE-000365-6c for kernel-team@lists.ubuntu.com; Fri, 24 Mar 2017 04:50:28 +0000 Received: from [175.41.48.77] (helo=localhost) by youngberry.canonical.com with esmtpsa (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.76) (envelope-from ) id 1crHBD-0000yk-EI for kernel-team@lists.ubuntu.com; Fri, 24 Mar 2017 04:50:27 +0000 From: Kai-Heng Feng To: kernel-team@lists.ubuntu.com Subject: [PATCH 1/5] [Yakkety] nvme/scsi: Remove power management support Date: Fri, 24 Mar 2017 12:50:17 +0800 Message-Id: <20170324045021.31977-2-kai.heng.feng@canonical.com> X-Mailer: git-send-email 2.12.1 In-Reply-To: <20170324045021.31977-1-kai.heng.feng@canonical.com> References: <20170324045021.31977-1-kai.heng.feng@canonical.com> X-BeenThere: kernel-team@lists.ubuntu.com X-Mailman-Version: 2.1.14 Precedence: list List-Id: Kernel team discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: kernel-team-bounces@lists.ubuntu.com Sender: kernel-team-bounces@lists.ubuntu.com From: Andy Lutomirski BugLink: https://bugs.launchpad.net/bugs/1664602 As far as I can tell, there is basically nothing correct about this code. It misinterprets npss (off-by-one). It hardcodes a bunch of power states, which is nonsense, because they're all just indices into a table that software needs to parse. It completely ignores the distinction between operational and non-operational states. And, until 4.8, if all of the above magically succeeded, it would dereference a NULL pointer and OOPS. Since this code appears to be useless, just delete it. Signed-off-by: Andy Lutomirski Reviewed-by: Christoph Hellwig Acked-by: Jay Freyensee Tested-by: Jay Freyensee Signed-off-by: Jens Axboe (cherry picked from commit 26501db8dcbc3c63c0d8fb6c5bb098bc7d35d741) Signed-off-by: Kai-Heng Feng --- drivers/nvme/host/scsi.c | 74 ++---------------------------------------------- 1 file changed, 3 insertions(+), 71 deletions(-) diff --git a/drivers/nvme/host/scsi.c b/drivers/nvme/host/scsi.c index e947e298a737..44009105f8c8 100644 --- a/drivers/nvme/host/scsi.c +++ b/drivers/nvme/host/scsi.c @@ -72,15 +72,6 @@ static int sg_version_num = 30534; /* 2 digits for each component */ #define ALL_LUNS_RETURNED 0x02 #define ALL_WELL_KNOWN_LUNS_RETURNED 0x01 #define RESTRICTED_LUNS_RETURNED 0x00 -#define NVME_POWER_STATE_START_VALID 0x00 -#define NVME_POWER_STATE_ACTIVE 0x01 -#define NVME_POWER_STATE_IDLE 0x02 -#define NVME_POWER_STATE_STANDBY 0x03 -#define NVME_POWER_STATE_LU_CONTROL 0x07 -#define POWER_STATE_0 0 -#define POWER_STATE_1 1 -#define POWER_STATE_2 2 -#define POWER_STATE_3 3 #define DOWNLOAD_SAVE_ACTIVATE 0x05 #define DOWNLOAD_SAVE_DEFER_ACTIVATE 0x0E #define ACTIVATE_DEFERRED_MICROCODE 0x0F @@ -1229,64 +1220,6 @@ static void nvme_trans_fill_read_cap(u8 *response, struct nvme_id_ns *id_ns, /* Start Stop Unit Helper Functions */ -static int nvme_trans_power_state(struct nvme_ns *ns, struct sg_io_hdr *hdr, - u8 pc, u8 pcmod, u8 start) -{ - int res; - int nvme_sc; - struct nvme_id_ctrl *id_ctrl; - int lowest_pow_st; /* max npss = lowest power consumption */ - unsigned ps_desired = 0; - - nvme_sc = nvme_identify_ctrl(ns->ctrl, &id_ctrl); - res = nvme_trans_status_code(hdr, nvme_sc); - if (res) - return res; - - lowest_pow_st = max(POWER_STATE_0, (int)(id_ctrl->npss - 1)); - kfree(id_ctrl); - - switch (pc) { - case NVME_POWER_STATE_START_VALID: - /* Action unspecified if POWER CONDITION MODIFIER != 0 */ - if (pcmod == 0 && start == 0x1) - ps_desired = POWER_STATE_0; - if (pcmod == 0 && start == 0x0) - ps_desired = lowest_pow_st; - break; - case NVME_POWER_STATE_ACTIVE: - /* Action unspecified if POWER CONDITION MODIFIER != 0 */ - if (pcmod == 0) - ps_desired = POWER_STATE_0; - break; - case NVME_POWER_STATE_IDLE: - /* Action unspecified if POWER CONDITION MODIFIER != [0,1,2] */ - if (pcmod == 0x0) - ps_desired = POWER_STATE_1; - else if (pcmod == 0x1) - ps_desired = POWER_STATE_2; - else if (pcmod == 0x2) - ps_desired = POWER_STATE_3; - break; - case NVME_POWER_STATE_STANDBY: - /* Action unspecified if POWER CONDITION MODIFIER != [0,1] */ - if (pcmod == 0x0) - ps_desired = max(POWER_STATE_0, (lowest_pow_st - 2)); - else if (pcmod == 0x1) - ps_desired = max(POWER_STATE_0, (lowest_pow_st - 1)); - break; - case NVME_POWER_STATE_LU_CONTROL: - default: - res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION, - ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB, - SCSI_ASCQ_CAUSE_NOT_REPORTABLE); - break; - } - nvme_sc = nvme_set_features(ns->ctrl, NVME_FEAT_POWER_MGMT, ps_desired, 0, - NULL); - return nvme_trans_status_code(hdr, nvme_sc); -} - static int nvme_trans_send_activate_fw_cmd(struct nvme_ns *ns, struct sg_io_hdr *hdr, u8 buffer_id) { @@ -2235,11 +2168,10 @@ static int nvme_trans_synchronize_cache(struct nvme_ns *ns, static int nvme_trans_start_stop(struct nvme_ns *ns, struct sg_io_hdr *hdr, u8 *cmd) { - u8 immed, pcmod, pc, no_flush, start; + u8 immed, pcmod, no_flush, start; immed = cmd[1] & 0x01; pcmod = cmd[3] & 0x0f; - pc = (cmd[4] & 0xf0) >> 4; no_flush = cmd[4] & 0x04; start = cmd[4] & 0x01; @@ -2254,8 +2186,8 @@ static int nvme_trans_start_stop(struct nvme_ns *ns, struct sg_io_hdr *hdr, if (res) return res; } - /* Setup the expected power state transition */ - return nvme_trans_power_state(ns, hdr, pc, pcmod, start); + + return 0; } }