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cxl: Add image control to sysfs

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load_image_on_perst identifies whether a PERST will cause the image to be
flashed to the card. And if so, which image.

Valid entries are: "none", "user" and "factory".

A value of "none" means PERST will not cause the image to be flashed. A
power cycle to the pcie slot is required to load the image.

"user" loads the user provided image and "factory" loads the factory image upon
PERST.

sysfs updates the cxl struct in the driver then calls cxl_update_image_control
to write the vals in the VSEC.

Signed-off-by: Ryan Grimm <grimm@linux.vnet.ibm.com>
Acked-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Ryan Grimm 2015-01-19 11:52:49 -06:00 committed by Michael Ellerman
parent 4beb5421ba
commit 95bc11bcd1
2 changed files with 53 additions and 0 deletions
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14
Documentation/ABI/testing/sysfs-class-cxl
View file

@ -132,3 +132,17 @@ Contact: linuxppc-dev@lists.ozlabs.org
Description: read only
Will return "user" or "factory" depending on the image loaded
onto the card.
What: /sys/class/cxl/<card>/load_image_on_perst
Date: December 2014
Contact: linuxppc-dev@lists.ozlabs.org
Description: read/write
Valid entries are "none", "user", and "factory".
"none" means PERST will not cause image to be loaded to the
card. A power cycle is required to load the image.
"none" could be useful for debugging because the trace arrays
are preserved.
"user" and "factory" means PERST will cause either the user or
user or factory image to be loaded.
Default is to reload on PERST whichever image the card has
loaded.

39
drivers/misc/cxl/sysfs.c
View file

@ -56,11 +56,50 @@ static ssize_t image_loaded_show(struct device *device,
return scnprintf(buf, PAGE_SIZE, "factory\n");
}
static ssize_t load_image_on_perst_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
struct cxl *adapter = to_cxl_adapter(device);
if (!adapter->perst_loads_image)
return scnprintf(buf, PAGE_SIZE, "none\n");
if (adapter->perst_select_user)
return scnprintf(buf, PAGE_SIZE, "user\n");
return scnprintf(buf, PAGE_SIZE, "factory\n");
}
static ssize_t load_image_on_perst_store(struct device *device,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct cxl *adapter = to_cxl_adapter(device);
int rc;
if (!strncmp(buf, "none", 4))
adapter->perst_loads_image = false;
else if (!strncmp(buf, "user", 4)) {
adapter->perst_select_user = true;
adapter->perst_loads_image = true;
} else if (!strncmp(buf, "factory", 7)) {
adapter->perst_select_user = false;
adapter->perst_loads_image = true;
} else
return -EINVAL;
if ((rc = cxl_update_image_control(adapter)))
return rc;
return count;
}
static struct device_attribute adapter_attrs[] = {
__ATTR_RO(caia_version),
__ATTR_RO(psl_revision),
__ATTR_RO(base_image),
__ATTR_RO(image_loaded),
__ATTR_RW(load_image_on_perst),
};