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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: Philippe Bergheaud <felix@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Philippe Bergheaud 2018-05-14 10:27:36 +02:00 committed by Michael Ellerman
parent 401dca8cbd
commit 497a0790e2
4 changed files with 25 additions and 1 deletions
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8
Documentation/ABI/testing/sysfs-class-cxl
View File

@ -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

1
drivers/misc/cxl/cxl.h
View File

@ -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:

7
drivers/misc/cxl/pci.c
View File

@ -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;

10
drivers/misc/cxl/sysfs.c
View File

@ -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),