From 2be2a98845e6742a96d48534294d2c5ba582e57f Mon Sep 17 00:00:00 2001 From: "Sumit.Saxena@avagotech.com" Date: Wed, 6 May 2015 19:01:02 +0530 Subject: [PATCH] megaraid_sas : Modify return value of megasas_issue_blocked_cmd() and wait_and_poll() to consider command status returned by firmware This patch is rebased on top of recently sent 18 patches(submitted by me) for megaraid_sas driver. Change the return value of wait_and_poll() and megsas_issue_blocked_cmd() based on MFI_STAT returned by firmware for that command. Earlier driver always send return type based on command completion (but never check MFI_STAT_OK for that command), so even if command is failed by firmware still driver will return SUCCESS status from these functions wait_and_poll() and megsas_issue_blocked_cmd() and if caller of these functions does not check command status (MFI_STAT), then it may endup using invalid data returned in DMA buffers(one of the example is megasas_ld_list_query DCMD). Best thing to avoid this type of issue is do error handling and set proper return type from caller function wait_and_poll() and megsas_issue_blocked_cmd(). The change proposed in this patch will fix the regression introduced in patch- "90dc9d9 megaraid_sas : MFI MPT linked list corruption fix" inside function megasas_ld_list_query(). Prior to this MFI MPT linked list corruption fix patch, megasas_ld_list_query() function used to check DCMD status(returned by firmware) but with this linked list corruption fix patch, DCMD status will not be checked inside function megasas_ld_list_query() and introduced this issue of wrong data being used by function megasas_ld_list_query(). Cc: Signed-off-by: Kashyap Desai Signed-off-by: Sumit Saxena Reviewed-by: Tomas Henzl Signed-off-by: James Bottomley --- drivers/scsi/megaraid/megaraid_sas.h | 2 +- drivers/scsi/megaraid/megaraid_sas_base.c | 67 +++++++++------------ drivers/scsi/megaraid/megaraid_sas_fusion.c | 3 +- 3 files changed, 30 insertions(+), 42 deletions(-) diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h index 53a3c3f64621..20c37541963f 100644 --- a/drivers/scsi/megaraid/megaraid_sas.h +++ b/drivers/scsi/megaraid/megaraid_sas.h @@ -1894,7 +1894,7 @@ struct megasas_cmd { u32 index; u8 sync_cmd; - u8 cmd_status; + u8 cmd_status_drv; u8 abort_aen; u8 retry_for_fw_reset; diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c index 1bc0c5af4f91..a022c39153cf 100644 --- a/drivers/scsi/megaraid/megaraid_sas_base.c +++ b/drivers/scsi/megaraid/megaraid_sas_base.c @@ -898,7 +898,7 @@ extern struct megasas_instance_template megasas_instance_template_fusion; * @instance: Adapter soft state * @cmd: Command packet to be issued * - * For polling, MFI requires the cmd_status to be set to 0xFF before posting. + * For polling, MFI requires the cmd_status to be set to MFI_STAT_INVALID_STATUS before posting. */ int megasas_issue_polled(struct megasas_instance *instance, struct megasas_cmd *cmd) @@ -940,19 +940,20 @@ megasas_issue_blocked_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd, int timeout) { int ret = 0; - cmd->cmd_status = ENODATA; + cmd->cmd_status_drv = MFI_STAT_INVALID_STATUS; instance->instancet->issue_dcmd(instance, cmd); if (timeout) { ret = wait_event_timeout(instance->int_cmd_wait_q, - cmd->cmd_status != ENODATA, timeout * HZ); + cmd->cmd_status_drv != MFI_STAT_INVALID_STATUS, timeout * HZ); if (!ret) return 1; } else wait_event(instance->int_cmd_wait_q, - cmd->cmd_status != ENODATA); + cmd->cmd_status_drv != MFI_STAT_INVALID_STATUS); - return 0; + return (cmd->cmd_status_drv == MFI_STAT_OK) ? + 0 : 1; } /** @@ -985,7 +986,7 @@ megasas_issue_blocked_abort_cmd(struct megasas_instance *instance, * Prepare and issue the abort frame */ abort_fr->cmd = MFI_CMD_ABORT; - abort_fr->cmd_status = 0xFF; + abort_fr->cmd_status = MFI_STAT_INVALID_STATUS; abort_fr->flags = cpu_to_le16(0); abort_fr->abort_context = cpu_to_le32(cmd_to_abort->index); abort_fr->abort_mfi_phys_addr_lo = @@ -994,13 +995,13 @@ megasas_issue_blocked_abort_cmd(struct megasas_instance *instance, cpu_to_le32(upper_32_bits(cmd_to_abort->frame_phys_addr)); cmd->sync_cmd = 1; - cmd->cmd_status = ENODATA; + cmd->cmd_status_drv = MFI_STAT_INVALID_STATUS; instance->instancet->issue_dcmd(instance, cmd); if (timeout) { ret = wait_event_timeout(instance->abort_cmd_wait_q, - cmd->cmd_status != ENODATA, timeout * HZ); + cmd->cmd_status_drv != MFI_STAT_INVALID_STATUS, timeout * HZ); if (!ret) { dev_err(&instance->pdev->dev, "Command timedout" "from %s\n", __func__); @@ -1008,7 +1009,7 @@ megasas_issue_blocked_abort_cmd(struct megasas_instance *instance, } } else wait_event(instance->abort_cmd_wait_q, - cmd->cmd_status != ENODATA); + cmd->cmd_status_drv != MFI_STAT_INVALID_STATUS); cmd->sync_cmd = 0; @@ -1909,7 +1910,7 @@ static int megasas_get_ld_vf_affiliation_111(struct megasas_instance *instance, memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE); dcmd->cmd = MFI_CMD_DCMD; - dcmd->cmd_status = 0xFF; + dcmd->cmd_status = MFI_STAT_INVALID_STATUS; dcmd->sge_count = 1; dcmd->flags = cpu_to_le16(MFI_FRAME_DIR_BOTH); dcmd->timeout = 0; @@ -2022,7 +2023,7 @@ static int megasas_get_ld_vf_affiliation_12(struct megasas_instance *instance, memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE); dcmd->cmd = MFI_CMD_DCMD; - dcmd->cmd_status = 0xFF; + dcmd->cmd_status = MFI_STAT_INVALID_STATUS; dcmd->sge_count = 1; dcmd->flags = cpu_to_le16(MFI_FRAME_DIR_BOTH); dcmd->timeout = 0; @@ -2189,7 +2190,7 @@ int megasas_sriov_start_heartbeat(struct megasas_instance *instance, dcmd->mbox.s[0] = cpu_to_le16(sizeof(struct MR_CTRL_HB_HOST_MEM)); dcmd->cmd = MFI_CMD_DCMD; - dcmd->cmd_status = 0xFF; + dcmd->cmd_status = MFI_STAT_INVALID_STATUS; dcmd->sge_count = 1; dcmd->flags = cpu_to_le16(MFI_FRAME_DIR_BOTH); dcmd->timeout = 0; @@ -2209,21 +2210,11 @@ int megasas_sriov_start_heartbeat(struct megasas_instance *instance, retval = megasas_issue_polled(instance, cmd); if (retval) { - printk(KERN_WARNING "megasas: SR-IOV: MR_DCMD_CTRL_SHARED_HOST" - "_MEM_ALLOC DCMD timed out for scsi%d\n", - instance->host->host_no); - retval = 1; - goto out; - } - - - if (dcmd->cmd_status) { - printk(KERN_WARNING "megasas: SR-IOV: MR_DCMD_CTRL_SHARED_HOST" - "_MEM_ALLOC DCMD failed with status 0x%x for scsi%d\n", - dcmd->cmd_status, - instance->host->host_no); + dev_warn(&instance->pdev->dev, "SR-IOV: MR_DCMD_CTRL_SHARED_HOST" + "_MEM_ALLOC DCMD %s for scsi%d\n", + (dcmd->cmd_status == MFI_STAT_INVALID_STATUS) ? + "timed out" : "failed", instance->host->host_no); retval = 1; - goto out; } out: @@ -2319,7 +2310,7 @@ static int megasas_wait_for_outstanding(struct megasas_instance *instance) "reset queue\n", reset_cmd); - reset_cmd->cmd_status = ENODATA; + reset_cmd->cmd_status_drv = MFI_STAT_INVALID_STATUS; instance->instancet->fire_cmd(instance, reset_cmd->frame_phys_addr, 0, instance->reg_set); @@ -2798,11 +2789,7 @@ static void megasas_complete_int_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd) { - cmd->cmd_status = cmd->frame->io.cmd_status; - - if (cmd->cmd_status == ENODATA) { - cmd->cmd_status = 0; - } + cmd->cmd_status_drv = cmd->frame->io.cmd_status; wake_up(&instance->int_cmd_wait_q); } @@ -2821,7 +2808,7 @@ megasas_complete_abort(struct megasas_instance *instance, { if (cmd->sync_cmd) { cmd->sync_cmd = 0; - cmd->cmd_status = 0; + cmd->cmd_status_drv = 0; wake_up(&instance->abort_cmd_wait_q); } @@ -3067,7 +3054,7 @@ megasas_issue_pending_cmds_again(struct megasas_instance *instance) printk(KERN_NOTICE "megasas: %p synchronous cmd" "on the internal reset queue," "issue it again.\n", cmd); - cmd->cmd_status = ENODATA; + cmd->cmd_status_drv = MFI_STAT_INVALID_STATUS; instance->instancet->fire_cmd(instance, cmd->frame_phys_addr , 0, instance->reg_set); @@ -3807,7 +3794,7 @@ megasas_get_pd_list(struct megasas_instance *instance) dcmd->mbox.b[0] = MR_PD_QUERY_TYPE_EXPOSED_TO_HOST; dcmd->mbox.b[1] = 0; dcmd->cmd = MFI_CMD_DCMD; - dcmd->cmd_status = 0xFF; + dcmd->cmd_status = MFI_STAT_INVALID_STATUS; dcmd->sge_count = 1; dcmd->flags = cpu_to_le16(MFI_FRAME_DIR_READ); dcmd->timeout = 0; @@ -3903,7 +3890,7 @@ megasas_get_ld_list(struct megasas_instance *instance) if (instance->supportmax256vd) dcmd->mbox.b[0] = 1; dcmd->cmd = MFI_CMD_DCMD; - dcmd->cmd_status = 0xFF; + dcmd->cmd_status = MFI_STAT_INVALID_STATUS; dcmd->sge_count = 1; dcmd->flags = cpu_to_le16(MFI_FRAME_DIR_READ); dcmd->timeout = 0; @@ -3992,7 +3979,7 @@ megasas_ld_list_query(struct megasas_instance *instance, u8 query_type) dcmd->mbox.b[2] = 1; dcmd->cmd = MFI_CMD_DCMD; - dcmd->cmd_status = 0xFF; + dcmd->cmd_status = MFI_STAT_INVALID_STATUS; dcmd->sge_count = 1; dcmd->flags = cpu_to_le16(MFI_FRAME_DIR_READ); dcmd->timeout = 0; @@ -4125,7 +4112,7 @@ megasas_get_ctrl_info(struct megasas_instance *instance) memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE); dcmd->cmd = MFI_CMD_DCMD; - dcmd->cmd_status = 0xFF; + dcmd->cmd_status = MFI_STAT_INVALID_STATUS; dcmd->sge_count = 1; dcmd->flags = cpu_to_le16(MFI_FRAME_DIR_READ); dcmd->timeout = 0; @@ -4197,7 +4184,7 @@ int megasas_set_crash_dump_params(struct megasas_instance *instance, memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE); dcmd->mbox.b[0] = crash_buf_state; dcmd->cmd = MFI_CMD_DCMD; - dcmd->cmd_status = 0xFF; + dcmd->cmd_status = MFI_STAT_INVALID_STATUS; dcmd->sge_count = 1; dcmd->flags = cpu_to_le16(MFI_FRAME_DIR_NONE); dcmd->timeout = 0; @@ -4264,7 +4251,7 @@ megasas_issue_init_mfi(struct megasas_instance *instance) initq_info->consumer_index_phys_addr_lo = cpu_to_le32(instance->consumer_h); init_frame->cmd = MFI_CMD_INIT; - init_frame->cmd_status = 0xFF; + init_frame->cmd_status = MFI_STAT_INVALID_STATUS; init_frame->queue_info_new_phys_addr_lo = cpu_to_le32(lower_32_bits(initq_info_h)); init_frame->queue_info_new_phys_addr_hi = diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c index 1c11a8bb8bf4..0637f42a0c36 100644 --- a/drivers/scsi/megaraid/megaraid_sas_fusion.c +++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c @@ -584,7 +584,8 @@ wait_and_poll(struct megasas_instance *instance, struct megasas_cmd *cmd, if (frame_hdr->cmd_status == 0xff) return -ETIME; - return 0; + return (frame_hdr->cmd_status == MFI_STAT_OK) ? + 0 : 1; } /** -- 2.20.1