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Date: Tue, 13 Sep 2016 18:28:53 -0700
From: Dan Williams <dan.j.williams@...el.com>
To: linux-nvdimm@...ts.01.org
Cc: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] nfit: fail DSMs that return non-zero status by default
For the DSMs where the kernel knows the format of the output buffer and
originates those DSMs from within the kernel, return -EIO for any
non-zero status. If the BIOS is indicating a status that we do not know
how to handle, fail the DSM.
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
drivers/acpi/nfit/core.c | 48 +++++++++++++++++++++++++++-------------------
1 file changed, 28 insertions(+), 20 deletions(-)
diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index ceb6671ab355..8d7cbecd7cce 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -94,54 +94,50 @@ static struct acpi_device *to_acpi_dev(struct acpi_nfit_desc *acpi_desc)
return to_acpi_device(acpi_desc->dev);
}
-static int xlat_status(void *buf, unsigned int cmd)
+static int xlat_status(void *buf, unsigned int cmd, u32 status)
{
struct nd_cmd_clear_error *clear_err;
struct nd_cmd_ars_status *ars_status;
- struct nd_cmd_ars_start *ars_start;
- struct nd_cmd_ars_cap *ars_cap;
u16 flags;
switch (cmd) {
case ND_CMD_ARS_CAP:
- ars_cap = buf;
- if ((ars_cap->status & 0xffff) == NFIT_ARS_CAP_NONE)
+ if ((status & 0xffff) == NFIT_ARS_CAP_NONE)
return -ENOTTY;
/* Command failed */
- if (ars_cap->status & 0xffff)
+ if (status & 0xffff)
return -EIO;
/* No supported scan types for this range */
flags = ND_ARS_PERSISTENT | ND_ARS_VOLATILE;
- if ((ars_cap->status >> 16 & flags) == 0)
+ if ((status >> 16 & flags) == 0)
return -ENOTTY;
break;
case ND_CMD_ARS_START:
- ars_start = buf;
/* ARS is in progress */
- if ((ars_start->status & 0xffff) == NFIT_ARS_START_BUSY)
+ if ((status & 0xffff) == NFIT_ARS_START_BUSY)
return -EBUSY;
/* Command failed */
- if (ars_start->status & 0xffff)
+ if (status & 0xffff)
return -EIO;
break;
case ND_CMD_ARS_STATUS:
ars_status = buf;
/* Command failed */
- if (ars_status->status & 0xffff)
+ if (status & 0xffff)
return -EIO;
/* Check extended status (Upper two bytes) */
- if (ars_status->status == NFIT_ARS_STATUS_DONE)
+ if (status == NFIT_ARS_STATUS_DONE)
return 0;
/* ARS is in progress */
- if (ars_status->status == NFIT_ARS_STATUS_BUSY)
+ if (status == NFIT_ARS_STATUS_BUSY)
return -EBUSY;
/* No ARS performed for the current boot */
- if (ars_status->status == NFIT_ARS_STATUS_NONE)
+ if (status == NFIT_ARS_STATUS_NONE)
return -EAGAIN;
/*
@@ -149,19 +145,19 @@ static int xlat_status(void *buf, unsigned int cmd)
* agent wants the scan to stop. If we didn't overflow
* then just continue with the returned results.
*/
- if (ars_status->status == NFIT_ARS_STATUS_INTR) {
+ if (status == NFIT_ARS_STATUS_INTR) {
if (ars_status->flags & NFIT_ARS_F_OVERFLOW)
return -ENOSPC;
return 0;
}
/* Unknown status */
- if (ars_status->status >> 16)
+ if (status >> 16)
return -EIO;
break;
case ND_CMD_CLEAR_ERROR:
clear_err = buf;
- if (clear_err->status & 0xffff)
+ if (status & 0xffff)
return -EIO;
if (!clear_err->cleared)
return -EIO;
@@ -172,6 +168,9 @@ static int xlat_status(void *buf, unsigned int cmd)
break;
}
+ /* all other non-zero status results in an error */
+ if (status)
+ return -EIO;
return 0;
}
@@ -186,10 +185,10 @@ static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
struct nd_cmd_pkg *call_pkg = NULL;
const char *cmd_name, *dimm_name;
unsigned long cmd_mask, dsm_mask;
+ u32 offset, fw_status = 0;
acpi_handle handle;
unsigned int func;
const u8 *uuid;
- u32 offset;
int rc, i;
func = cmd;
@@ -317,6 +316,15 @@ static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
out_obj->buffer.pointer + offset, out_size);
offset += out_size;
}
+
+ /*
+ * Set fw_status for all the commands with a known format to be
+ * later interpreted by xlat_status().
+ */
+ if (i >= 1 && ((cmd >= ND_CMD_ARS_CAP && cmd <= ND_CMD_CLEAR_ERROR)
+ || (cmd >= ND_CMD_SMART && cmd <= ND_CMD_VENDOR)))
+ fw_status = *(u32 *) out_obj->buffer.pointer;
+
if (offset + in_buf.buffer.length < buf_len) {
if (i >= 1) {
/*
@@ -325,7 +333,7 @@ static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
*/
rc = buf_len - offset - in_buf.buffer.length;
if (cmd_rc)
- *cmd_rc = xlat_status(buf, cmd);
+ *cmd_rc = xlat_status(buf, cmd, fw_status);
} else {
dev_err(dev, "%s:%s underrun cmd: %s buf_len: %d out_len: %d\n",
__func__, dimm_name, cmd_name, buf_len,
@@ -335,7 +343,7 @@ static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
} else {
rc = 0;
if (cmd_rc)
- *cmd_rc = xlat_status(buf, cmd);
+ *cmd_rc = xlat_status(buf, cmd, fw_status);
}
out:
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