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Commit 497a0790 authored by Philippe Bergheaud's avatar Philippe Bergheaud Committed by Michael Ellerman
Browse files

cxl: Report the tunneled operations status 



Failure to synchronize the tunneled operations does not prevent
the initialization of the cxl card. This patch reports the tunneled
operations status via /sys.

Signed-off-by: default avatarPhilippe Bergheaud <felix@linux.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 401dca8c

Documentation/ABI/testing/sysfs-class-cxl

+8 −0
Original line number Diff line number Diff line
@@ -244,3 +244,11 @@ Description: read only 
                Returns 1 if the psl timebase register is synchronized

                with the core timebase register, 0 otherwise.

Users:          https://github.com/ibm-capi/libcxl



What:           /sys/class/cxl/<card>/tunneled_ops_supported

Date:           May 2018

Contact:        linuxppc-dev@lists.ozlabs.org

Description:    read only

                Returns 1 if tunneled operations are supported in capi mode,

                0 otherwise.

Users:          https://github.com/ibm-capi/libcxl

drivers/misc/cxl/cxl.h

+1 −0
Original line number Diff line number Diff line
@@ -717,6 +717,7 @@ struct cxl { 
	bool perst_select_user;

	bool perst_same_image;

	bool psl_timebase_synced;

	bool tunneled_ops_supported;



	/*

	 * number of contexts mapped on to this card. Possible values are:

drivers/misc/cxl/pci.c

+6 −1
Original line number Diff line number Diff line
@@ -1742,9 +1742,14 @@ static int cxl_configure_adapter(struct cxl *adapter, struct pci_dev *dev) 
	/* Required for devices using CAPP DMA mode, harmless for others */

	pci_set_master(dev);



	if (cxl_is_power9())

	adapter->tunneled_ops_supported = false;



	if (cxl_is_power9()) {

		if (pnv_pci_set_tunnel_bar(dev, 0x00020000E0000000ull, 1))

			dev_info(&dev->dev, "Tunneled operations unsupported\n");

		else

			adapter->tunneled_ops_supported = true;

	}



	if ((rc = pnv_phb_to_cxl_mode(dev, adapter->native->sl_ops->capi_mode)))

		goto err;

drivers/misc/cxl/sysfs.c

+10 −0
Original line number Diff line number Diff line
@@ -78,6 +78,15 @@ static ssize_t psl_timebase_synced_show(struct device *device, 
	return scnprintf(buf, PAGE_SIZE, "%i\n", adapter->psl_timebase_synced);

}



static ssize_t tunneled_ops_supported_show(struct device *device,

					struct device_attribute *attr,

					char *buf)

{

	struct cxl *adapter = to_cxl_adapter(device);



	return scnprintf(buf, PAGE_SIZE, "%i\n", adapter->tunneled_ops_supported);

}



static ssize_t reset_adapter_store(struct device *device,

				   struct device_attribute *attr,

				   const char *buf, size_t count)
@@ -183,6 +192,7 @@ static struct device_attribute adapter_attrs[] = { 
	__ATTR_RO(base_image),

	__ATTR_RO(image_loaded),

	__ATTR_RO(psl_timebase_synced),

	__ATTR_RO(tunneled_ops_supported),

	__ATTR_RW(load_image_on_perst),

	__ATTR_RW(perst_reloads_same_image),

	__ATTR(reset, S_IWUSR, NULL, reset_adapter_store),