Commit 95bc11bc authored by Ryan Grimm's avatar Ryan Grimm Committed by Michael Ellerman
Browse files

cxl: Add image control to sysfs 



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: default avatarRyan Grimm <grimm@linux.vnet.ibm.com>
Acked-by: default avatarIan Munsie <imunsie@au1.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 4beb5421

Documentation/ABI/testing/sysfs-class-cxl

+14 −0
Original line number Diff line number Diff line
@@ -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.

drivers/misc/cxl/sysfs.c

+39 −0
Original line number Diff line number Diff line
@@ -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),

};

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