| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Wed, 07 Sep 2011 08:46:23 -0500
From: Brian King <brking@...ux.vnet.ibm.com>
To: Jan Kiszka <jan.kiszka@...mens.com>
CC: "Michael S. Tsirkin" <mst@...hat.com>,
Jesse Barnes <jbarnes@...tuousgeek.org>,
Brian King <brking@...ibm.com>,
"James E.J. Bottomley" <JBottomley@...allels.com>,
"Hans J. Koch" <hjk@...sjkoch.de>,
Greg Kroah-Hartman <gregkh@...e.de>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
"kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: Re: [RFC] pci: Rework config space blocking services
Here is how I would prefer to rework ipr.
Thanks,
Brian
--
Brian King
Linux on Power Virtualization
IBM Linux Technology Center
The PCI config space blocking API has changed to better
allow for multiple users. Update ipr to use the new API.
Signed-off-by: Brian King <brking@...ux.vnet.ibm.com>
---
drivers/scsi/ipr.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++------
drivers/scsi/ipr.h | 1
2 files changed, 60 insertions(+), 7 deletions(-)
diff -puN drivers/scsi/ipr.c~ipr_new_pci_block drivers/scsi/ipr.c
--- linux-2.6/drivers/scsi/ipr.c~ipr_new_pci_block 2011-09-06 16:52:47.000000000 -0500
+++ linux-2.6-bjking1/drivers/scsi/ipr.c 2011-09-07 08:34:54.000000000 -0500
@@ -7639,8 +7639,12 @@ static int ipr_reset_restore_cfg_space(s
**/
static int ipr_reset_bist_done(struct ipr_cmnd *ipr_cmd)
{
+ struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;
+
ENTER;
- pci_unblock_user_cfg_access(ipr_cmd->ioa_cfg->pdev);
+ if (ioa_cfg->ucfg_blocked)
+ pci_unblock_cfg_access(ioa_cfg->pdev);
+ ioa_cfg->ucfg_blocked = 0;
ipr_cmd->job_step = ipr_reset_restore_cfg_space;
LEAVE;
return IPR_RC_JOB_CONTINUE;
@@ -7661,8 +7665,6 @@ static int ipr_reset_start_bist(struct i
int rc = PCIBIOS_SUCCESSFUL;
ENTER;
- pci_block_user_cfg_access(ioa_cfg->pdev);
-
if (ioa_cfg->ipr_chip->bist_method == IPR_MMIO)
writel(IPR_UPROCI_SIS64_START_BIST,
ioa_cfg->regs.set_uproc_interrupt_reg32);
@@ -7674,7 +7676,9 @@ static int ipr_reset_start_bist(struct i
ipr_reset_start_timer(ipr_cmd, IPR_WAIT_FOR_BIST_TIMEOUT);
rc = IPR_RC_JOB_RETURN;
} else {
- pci_unblock_user_cfg_access(ipr_cmd->ioa_cfg->pdev);
+ if (ioa_cfg->ucfg_blocked)
+ pci_unblock_cfg_access(ipr_cmd->ioa_cfg->pdev);
+ ioa_cfg->ucfg_blocked = 0;
ipr_cmd->s.ioasa.hdr.ioasc = cpu_to_be32(IPR_IOASC_PCI_ACCESS_ERROR);
rc = IPR_RC_JOB_CONTINUE;
}
@@ -7717,7 +7721,6 @@ static int ipr_reset_slot_reset(struct i
struct pci_dev *pdev = ioa_cfg->pdev;
ENTER;
- pci_block_user_cfg_access(pdev);
pci_set_pcie_reset_state(pdev, pcie_warm_reset);
ipr_cmd->job_step = ipr_reset_slot_reset_done;
ipr_reset_start_timer(ipr_cmd, IPR_PCI_RESET_TIMEOUT);
@@ -7726,6 +7729,55 @@ static int ipr_reset_slot_reset(struct i
}
/**
+ * ipr_reset_block_config_access_wait - Wait for permission to block config access
+ * @ipr_cmd: ipr command struct
+ *
+ * Description: This attempts to block config access to the IOA.
+ *
+ * Return value:
+ * IPR_RC_JOB_CONTINUE / IPR_RC_JOB_RETURN
+ **/
+static int ipr_reset_block_config_access_wait(struct ipr_cmnd *ipr_cmd)
+{
+ struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;
+ int rc = IPR_RC_JOB_CONTINUE;
+
+ if (pci_block_cfg_access_in_atomic(ioa_cfg->pdev)) {
+ if (ipr_cmd->u.time_left) {
+ rc = IPR_RC_JOB_RETURN;
+ ipr_cmd->u.time_left -= IPR_CHECK_FOR_RESET_TIMEOUT;
+ ipr_reset_start_timer(ipr_cmd, IPR_CHECK_FOR_RESET_TIMEOUT);
+ } else {
+ ipr_cmd->job_step = ioa_cfg->reset;
+ dev_err(&ioa_cfg->pdev->dev,
+ "Timed out waiting to block config access. Resetting anyway.\n");
+ }
+ } else {
+ ioa_cfg->ucfg_blocked = 1;
+ ipr_cmd->job_step = ioa_cfg->reset;
+ }
+
+ return rc;
+}
+
+/**
+ * ipr_reset_block_config_access - Block config access to the IOA
+ * @ipr_cmd: ipr command struct
+ *
+ * Description: This attempts to block config access to the IOA
+ *
+ * Return value:
+ * IPR_RC_JOB_CONTINUE
+ **/
+static int ipr_reset_block_config_access(struct ipr_cmnd *ipr_cmd)
+{
+ ipr_cmd->ioa_cfg->ucfg_blocked = 0;
+ ipr_cmd->job_step = ipr_reset_block_config_access_wait;
+ ipr_cmd->u.time_left = IPR_WAIT_FOR_RESET_TIMEOUT;
+ return IPR_RC_JOB_CONTINUE;
+}
+
+/**
* ipr_reset_allowed - Query whether or not IOA can be reset
* @ioa_cfg: ioa config struct
*
@@ -7764,7 +7816,7 @@ static int ipr_reset_wait_to_start_bist(
ipr_cmd->u.time_left -= IPR_CHECK_FOR_RESET_TIMEOUT;
ipr_reset_start_timer(ipr_cmd, IPR_CHECK_FOR_RESET_TIMEOUT);
} else {
- ipr_cmd->job_step = ioa_cfg->reset;
+ ipr_cmd->job_step = ipr_reset_block_config_access;
rc = IPR_RC_JOB_CONTINUE;
}
@@ -7797,7 +7849,7 @@ static int ipr_reset_alert(struct ipr_cm
writel(IPR_UPROCI_RESET_ALERT, ioa_cfg->regs.set_uproc_interrupt_reg32);
ipr_cmd->job_step = ipr_reset_wait_to_start_bist;
} else {
- ipr_cmd->job_step = ioa_cfg->reset;
+ ipr_cmd->job_step = ipr_reset_block_config_access;
}
ipr_cmd->u.time_left = IPR_WAIT_FOR_RESET_TIMEOUT;
diff -puN drivers/scsi/ipr.h~ipr_new_pci_block drivers/scsi/ipr.h
--- linux-2.6/drivers/scsi/ipr.h~ipr_new_pci_block 2011-09-07 07:29:20.000000000 -0500
+++ linux-2.6-bjking1/drivers/scsi/ipr.h 2011-09-07 08:10:29.000000000 -0500
@@ -1384,6 +1384,7 @@ struct ipr_ioa_cfg {
u8 needs_warm_reset:1;
u8 msi_received:1;
u8 sis64:1;
+ u8 ucfg_blocked:1;
u8 revid;
_
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists