cxl: Report the tunneled operations status

BugLink: http://bugs.launchpad.net/bugs/1774471
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: Philippe Bergheaud <felix@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
(cherry picked from commit 497a0790e2c604366b9e35dcb41310319e9bca13)
Signed-off-by: Joseph Salisbury <joseph.salisbury@canonical.com>
Acked-by: Khalid Elmously <khalid.elmously@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/Documentation/ABI/testing/sysfs-class-cxl b/Documentation/ABI/testing/sysfs-class-cxl
index 640f65e79ef1c00c94508b6b9f9fe8b63a1305a6..8e69345c37ccd9e1d74bd86f5858a45b1573f838 100644 (file)
--- a/Documentation/ABI/testing/sysfs-class-cxl
+++ b/Documentation/ABI/testing/sysfs-class-cxl
@@ -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

diff --git a/drivers/misc/cxl/cxl.h b/drivers/misc/cxl/cxl.h
index 46bb384837a848354dd7da63541a38dd5005c0cb..8a57ff19ab7b5c5bdc14d3c7b58a1b1fed8d42d4 100644 (file)
--- a/drivers/misc/cxl/cxl.h
+++ b/drivers/misc/cxl/cxl.h
@@ -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:

diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c
index 4eb893284af28dea13f39992ef79bd1693bac1e7..4d6736f9d46399b0ea2f1336404acd041af91c86 100644 (file)
--- a/drivers/misc/cxl/pci.c
+++ b/drivers/misc/cxl/pci.c
@@ -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;

diff --git a/drivers/misc/cxl/sysfs.c b/drivers/misc/cxl/sysfs.c
index 95285b7f636ff3f854876e5743658f91d88c3e3d..4b5a4c5d3c012dff77508b9f0b8b9883671e594c 100644 (file)
--- a/drivers/misc/cxl/sysfs.c
+++ b/drivers/misc/cxl/sysfs.c
@@ -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),