From f7a919b4cd048f345c07c2235d0fb8ac93d24cca Mon Sep 17 00:00:00 2001 From: James Smart Date: Sun, 21 Aug 2011 21:49:16 -0400 Subject: [PATCH] [SCSI] lpfc 8.3.26: Fix SYSFS interface issues Fix SYSFS interface issues. - In the lpfc_sli4_pdev_status_reg_wait() routine, after initial 100ms delay following write to PHYSDEV_CONTROL register for the firmware reaction, check the RN bit and ERR bit of the SLIPORT_STATUS register. If none of them became 1, the previous PHYSDEV_CONTROL register should be considered failed due to lack of privilege and error for no permission should be returned immediately without getting into the wait for RDY bits on the SLIPORT_STATUS register. - Remove the driver check on dev->is_physfn before proceed to perform the PHYSDEV_CONTROL register write, and let the PCI function's privilege setting and driver handling of PHYSDEV_CONTROL register write failure to handle the reset-ability through the SLI port. - Added key to ctlreg_write to prevent unauthorized or unexpected write to the control register. - Change return to EACCES for sysfs access that are failed because hba_reset is disabled. Signed-off-by: Alex Iannicelli Signed-off-by: James Smart Signed-off-by: James Bottomley --- drivers/scsi/lpfc/lpfc_attr.c | 42 +++++++++++++++++++++++------------ drivers/scsi/lpfc/lpfc_init.c | 3 --- 2 files changed, 28 insertions(+), 17 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c index 2542f1f8bf86..13215cd396aa 100644 --- a/drivers/scsi/lpfc/lpfc_attr.c +++ b/drivers/scsi/lpfc/lpfc_attr.c @@ -52,6 +52,13 @@ #define LPFC_MIN_DEVLOSS_TMO 1 #define LPFC_MAX_DEVLOSS_TMO 255 +/* + * Write key size should be multiple of 4. If write key is changed + * make sure that library write key is also changed. + */ +#define LPFC_REG_WRITE_KEY_SIZE 4 +#define LPFC_REG_WRITE_KEY "EMLX" + /** * lpfc_jedec_to_ascii - Hex to ascii convertor according to JEDEC rules * @incr: integer to convert. @@ -693,7 +700,7 @@ lpfc_selective_reset(struct lpfc_hba *phba) int rc; if (!phba->cfg_enable_hba_reset) - return -EIO; + return -EACCES; status = lpfc_do_offline(phba, LPFC_EVT_OFFLINE); @@ -768,13 +775,18 @@ lpfc_issue_reset(struct device *dev, struct device_attribute *attr, static int lpfc_sli4_pdev_status_reg_wait(struct lpfc_hba *phba) { - struct lpfc_register portstat_reg; + struct lpfc_register portstat_reg = {0}; int i; - + msleep(100); lpfc_readl(phba->sli4_hba.u.if_type2.STATUSregaddr, &portstat_reg.word0); + /* verify if privilaged for the request operation */ + if (!bf_get(lpfc_sliport_status_rn, &portstat_reg) && + !bf_get(lpfc_sliport_status_err, &portstat_reg)) + return -EPERM; + /* wait for the SLI port firmware ready after firmware reset */ for (i = 0; i < LPFC_FW_RESET_MAXIMUM_WAIT_10MS_CNT; i++) { msleep(10); @@ -816,16 +828,13 @@ lpfc_sli4_pdev_reg_request(struct lpfc_hba *phba, uint32_t opcode) int rc; if (!phba->cfg_enable_hba_reset) - return -EIO; + return -EACCES; if ((phba->sli_rev < LPFC_SLI_REV4) || (bf_get(lpfc_sli_intf_if_type, &phba->sli4_hba.sli_intf) != LPFC_SLI_INTF_IF_TYPE_2)) return -EPERM; - if (!pdev->is_physfn) - return -EPERM; - /* Disable SR-IOV virtual functions if enabled */ if (phba->cfg_sriov_nr_virtfn) { pci_disable_sriov(pdev); @@ -858,7 +867,7 @@ lpfc_sli4_pdev_reg_request(struct lpfc_hba *phba, uint32_t opcode) rc = lpfc_sli4_pdev_status_reg_wait(phba); if (rc) - return -EIO; + return rc; init_completion(&online_compl); rc = lpfc_workq_post_event(phba, &status, &online_compl, @@ -984,7 +993,7 @@ lpfc_board_mode_store(struct device *dev, struct device_attribute *attr, if (!status) return strlen(buf); else - return -EIO; + return status; } /** @@ -3885,18 +3894,23 @@ sysfs_ctlreg_write(struct file *filp, struct kobject *kobj, if ((off + count) > FF_REG_AREA_SIZE) return -ERANGE; - if (count == 0) return 0; + if (count <= LPFC_REG_WRITE_KEY_SIZE) + return 0; if (off % 4 || count % 4 || (unsigned long)buf % 4) return -EINVAL; - if (!(vport->fc_flag & FC_OFFLINE_MODE)) { + /* This is to protect HBA registers from accidental writes. */ + if (memcmp(buf, LPFC_REG_WRITE_KEY, LPFC_REG_WRITE_KEY_SIZE)) + return -EINVAL; + + if (!(vport->fc_flag & FC_OFFLINE_MODE)) return -EPERM; - } spin_lock_irq(&phba->hbalock); - for (buf_off = 0; buf_off < count; buf_off += sizeof(uint32_t)) - writel(*((uint32_t *)(buf + buf_off)), + for (buf_off = 0; buf_off < count - LPFC_REG_WRITE_KEY_SIZE; + buf_off += sizeof(uint32_t)) + writel(*((uint32_t *)(buf + buf_off + LPFC_REG_WRITE_KEY_SIZE)), phba->ctrl_regs_memmap_p + off + buf_off); spin_unlock_irq(&phba->hbalock); diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c index b9ff38fa7c26..d8ac7694854e 100644 --- a/drivers/scsi/lpfc/lpfc_init.c +++ b/drivers/scsi/lpfc/lpfc_init.c @@ -4056,9 +4056,6 @@ lpfc_sli_sriov_nr_virtfn_get(struct lpfc_hba *phba) uint16_t nr_virtfn; int pos; - if (!pdev->is_physfn) - return 0; - pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV); if (pos == 0) return 0;