From: Christophe Lombard <clomb...@linux.vnet.ibm.com>
Filter out a few adapter parameters which don't make sense in a guest.
Document the changes.
Co-authored-by: Frederic Barrat <fbar...@linux.vnet.ibm.com>
Signed-off-by: Frederic Barrat <fbar...@linux.vnet.ibm.com>
Signed-off-by: Christophe Lombard <clomb...@linux.vnet.ibm.com>
---
Documentation/ABI/testing/sysfs-class-cxl | 8 +++----
drivers/misc/cxl/cxl.h | 1 +
drivers/misc/cxl/guest.c | 12 +++++++++++
drivers/misc/cxl/native.c | 6 ++++++
drivers/misc/cxl/sysfs.c | 36 +++++++++++++++++++++++--------
5 files changed, 50 insertions(+), 13 deletions(-)
diff --git a/Documentation/ABI/testing/sysfs-class-cxl
b/Documentation/ABI/testing/sysfs-class-cxl
index b07e86d..4d0da47 100644
--- a/Documentation/ABI/testing/sysfs-class-cxl
+++ b/Documentation/ABI/testing/sysfs-class-cxl
@@ -183,7 +183,7 @@ Description: read only
Identifies the revision level of the PSL.
Users: https://github.com/ibm-capi/libcxl
-What: /sys/class/cxl/<card>/base_image
+What: /sys/class/cxl/<card>/base_image (not in a guest)
Date: September 2014
Contact: linuxppc-dev@lists.ozlabs.org
Description: read only
@@ -193,7 +193,7 @@ Description: read only
during the initial program load.
Users: https://github.com/ibm-capi/libcxl
-What: /sys/class/cxl/<card>/image_loaded
+What: /sys/class/cxl/<card>/image_loaded (not in a guest)
Date: September 2014
Contact: linuxppc-dev@lists.ozlabs.org
Description: read only
@@ -201,7 +201,7 @@ Description: read only
onto the card.
Users: https://github.com/ibm-capi/libcxl
-What: /sys/class/cxl/<card>/load_image_on_perst
+What: /sys/class/cxl/<card>/load_image_on_perst (not in a guest)
Date: December 2014
Contact: linuxppc-dev@lists.ozlabs.org
Description: read/write
@@ -224,7 +224,7 @@ Description: write only
to reload the FPGA depending on load_image_on_perst.
Users: https://github.com/ibm-capi/libcxl
-What: /sys/class/cxl/<card>/perst_reloads_same_image
+What: /sys/class/cxl/<card>/perst_reloads_same_image (not in a guest)
Date: July 2015
Contact: linuxppc-dev@lists.ozlabs.org
Description: read/write
diff --git a/drivers/misc/cxl/cxl.h b/drivers/misc/cxl/cxl.h
index 060e85a..ee0bbbd 100644
--- a/drivers/misc/cxl/cxl.h
+++ b/drivers/misc/cxl/cxl.h
@@ -843,6 +843,7 @@ struct cxl_backend_ops {
int (*attach_process)(struct cxl_context *ctx, bool kernel,
u64 wed, u64 amr);
int (*detach_process)(struct cxl_context *ctx);
+ bool (*support_attributes)(const char *attr_name);
bool (*link_ok)(struct cxl *cxl);
void (*release_afu)(struct device *dev);
ssize_t (*afu_read_err_buffer)(struct cxl_afu *afu, char *buf,
diff --git a/drivers/misc/cxl/guest.c b/drivers/misc/cxl/guest.c
index 03eb83d..d02ff03 100644
--- a/drivers/misc/cxl/guest.c
+++ b/drivers/misc/cxl/guest.c
@@ -596,6 +596,17 @@ static int guest_afu_check_and_enable(struct cxl_afu *afu)
return 0;
}
+static bool guest_support_attributes(const char *attr_name)
+{
+ if ((strcmp(attr_name, "base_image") == 0) ||
+ (strcmp(attr_name, "load_image_on_perst") == 0) ||
+ (strcmp(attr_name, "perst_reloads_same_image") == 0) ||
+ (strcmp(attr_name, "image_loaded") == 0))
+ return false;
+
+ return true;
+}
+
static int activate_afu_directed(struct cxl_afu *afu)
{
int rc;
@@ -936,6 +947,7 @@ const struct cxl_backend_ops cxl_guest_ops = {
.ack_irq = guest_ack_irq,
.attach_process = guest_attach_process,
.detach_process = guest_detach_process,
+ .support_attributes = guest_support_attributes,
.link_ok = guest_link_ok,
.release_afu = guest_release_afu,
.afu_read_err_buffer = guest_afu_read_err_buffer,
diff --git a/drivers/misc/cxl/native.c b/drivers/misc/cxl/native.c
index c0bca59..acb9486 100644
--- a/drivers/misc/cxl/native.c
+++ b/drivers/misc/cxl/native.c
@@ -967,6 +967,11 @@ int cxl_check_error(struct cxl_afu *afu)
return (cxl_p1n_read(afu, CXL_PSL_SCNTL_An) == ~0ULL);
}
+static bool native_support_attributes(const char *attr_name)
+{
+ return true;
+}
+
static int native_afu_cr_read64(struct cxl_afu *afu, int cr, u64 off, u64 *out)
{
if (unlikely(!cxl_ops->link_ok(afu->adapter)))
@@ -1026,6 +1031,7 @@ const struct cxl_backend_ops cxl_native_ops = {
.ack_irq = native_ack_irq,
.attach_process = native_attach_process,
.detach_process = native_detach_process,
+ .support_attributes = native_support_attributes,
.link_ok = cxl_adapter_link_ok,
.release_afu = cxl_pci_release_afu,
.afu_read_err_buffer = cxl_pci_afu_read_err_buffer,
diff --git a/drivers/misc/cxl/sysfs.c b/drivers/misc/cxl/sysfs.c
index 1a1409c..41963d4 100644
--- a/drivers/misc/cxl/sysfs.c
+++ b/drivers/misc/cxl/sysfs.c
@@ -253,8 +253,14 @@ static ssize_t irqs_max_store(struct device *device,
if (irqs_max < afu->pp_irqs)
return -EINVAL;
- if (irqs_max > afu->adapter->user_irqs)
- return -EINVAL;
+ if (cpu_has_feature(CPU_FTR_HVMODE)) {
+ if (irqs_max > afu->adapter->user_irqs)
+ return -EINVAL;
+ } else {
+ /* pHyp sets a per-AFU limit */
+ if (irqs_max > afu->guest->max_ints)
+ return -EINVAL;
+ }
afu->irqs_max = irqs_max;
return count;
@@ -406,24 +412,36 @@ static struct device_attribute afu_attrs[] = {
int cxl_sysfs_adapter_add(struct cxl *adapter)
{
+ struct device_attribute *dev_attr;
int i, rc;
for (i = 0; i < ARRAY_SIZE(adapter_attrs); i++) {
- if ((rc = device_create_file(&adapter->dev, &adapter_attrs[i])))
- goto err;
+ dev_attr = &adapter_attrs[i];
+ if (cxl_ops->support_attributes(dev_attr->attr.name)) {
+ if ((rc = device_create_file(&adapter->dev, dev_attr)))
+ goto err;
+ }
}
return 0;
err:
- for (i--; i >= 0; i--)
- device_remove_file(&adapter->dev, &adapter_attrs[i]);
+ for (i--; i >= 0; i--) {
+ dev_attr = &adapter_attrs[i];
+ if (cxl_ops->support_attributes(dev_attr->attr.name))
+ device_remove_file(&adapter->dev, dev_attr);
+ }
return rc;
}
+
void cxl_sysfs_adapter_remove(struct cxl *adapter)
{
+ struct device_attribute *dev_attr;
int i;
- for (i = 0; i < ARRAY_SIZE(adapter_attrs); i++)
- device_remove_file(&adapter->dev, &adapter_attrs[i]);
+ for (i = 0; i < ARRAY_SIZE(adapter_attrs); i++) {
+ dev_attr = &adapter_attrs[i];
+ if (cxl_ops->support_attributes(dev_attr->attr.name))
+ device_remove_file(&adapter->dev, dev_attr);
+ }
}
struct afu_config_record {
@@ -534,7 +552,7 @@ static struct afu_config_record
*cxl_sysfs_afu_new_cr(struct cxl_afu *afu, int c
/*
* Export raw AFU PCIe like config record. For now this is read only by
* root - we can expand that later to be readable by non-root and maybe
- * even writable provided we have a good use-case. Once we suport
+ * even writable provided we have a good use-case. Once we support
* exposing AFUs through a virtual PHB they will get that for free from
* Linux' PCI infrastructure, but until then it's not clear that we
* need it for anything since the main use case is just identifying
--
1.9.1
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@lists.ozlabs.org
https://lists.ozlabs.org/listinfo/linuxppc-dev
