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path: root/drivers/misc/cxl/sysfs.c
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Diffstat (limited to 'drivers/misc/cxl/sysfs.c')
-rw-r--r--drivers/misc/cxl/sysfs.c236
1 files changed, 226 insertions, 10 deletions
diff --git a/drivers/misc/cxl/sysfs.c b/drivers/misc/cxl/sysfs.c
index 461bdbd5d483..d0c38c7bc0c4 100644
--- a/drivers/misc/cxl/sysfs.c
+++ b/drivers/misc/cxl/sysfs.c
@@ -10,6 +10,7 @@
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/sysfs.h>
+#include <linux/pci_regs.h>
#include "cxl.h"
@@ -56,11 +57,68 @@ static ssize_t image_loaded_show(struct device *device,
return scnprintf(buf, PAGE_SIZE, "factory\n");
}
+static ssize_t reset_adapter_store(struct device *device,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct cxl *adapter = to_cxl_adapter(device);
+ int rc;
+ int val;
+
+ rc = sscanf(buf, "%i", &val);
+ if ((rc != 1) || (val != 1))
+ return -EINVAL;
+
+ if ((rc = cxl_reset(adapter)))
+ return rc;
+ return count;
+}
+
+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),
+ __ATTR(reset, S_IWUSR, NULL, reset_adapter_store),
};
@@ -310,8 +368,6 @@ static struct device_attribute afu_attrs[] = {
__ATTR(reset, S_IWUSR, NULL, reset_store_afu),
};
-
-
int cxl_sysfs_adapter_add(struct cxl *adapter)
{
int i, rc;
@@ -334,31 +390,191 @@ void cxl_sysfs_adapter_remove(struct cxl *adapter)
device_remove_file(&adapter->dev, &adapter_attrs[i]);
}
+struct afu_config_record {
+ struct kobject kobj;
+ struct bin_attribute config_attr;
+ struct list_head list;
+ int cr;
+ u16 device;
+ u16 vendor;
+ u32 class;
+};
+
+#define to_cr(obj) container_of(obj, struct afu_config_record, kobj)
+
+static ssize_t vendor_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct afu_config_record *cr = to_cr(kobj);
+
+ return scnprintf(buf, PAGE_SIZE, "0x%.4x\n", cr->vendor);
+}
+
+static ssize_t device_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct afu_config_record *cr = to_cr(kobj);
+
+ return scnprintf(buf, PAGE_SIZE, "0x%.4x\n", cr->device);
+}
+
+static ssize_t class_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct afu_config_record *cr = to_cr(kobj);
+
+ return scnprintf(buf, PAGE_SIZE, "0x%.6x\n", cr->class);
+}
+
+static ssize_t afu_read_config(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr, char *buf,
+ loff_t off, size_t count)
+{
+ struct afu_config_record *cr = to_cr(kobj);
+ struct cxl_afu *afu = to_cxl_afu(container_of(kobj->parent, struct device, kobj));
+
+ u64 i, j, val, size = afu->crs_len;
+
+ if (off > size)
+ return 0;
+ if (off + count > size)
+ count = size - off;
+
+ for (i = 0; i < count;) {
+ val = cxl_afu_cr_read64(afu, cr->cr, off & ~0x7);
+ for (j = off & 0x7; j < 8 && i < count; i++, j++, off++)
+ buf[i] = (val >> (j * 8)) & 0xff;
+ }
+
+ return count;
+}
+
+static struct kobj_attribute vendor_attribute =
+ __ATTR_RO(vendor);
+static struct kobj_attribute device_attribute =
+ __ATTR_RO(device);
+static struct kobj_attribute class_attribute =
+ __ATTR_RO(class);
+
+static struct attribute *afu_cr_attrs[] = {
+ &vendor_attribute.attr,
+ &device_attribute.attr,
+ &class_attribute.attr,
+ NULL,
+};
+
+static void release_afu_config_record(struct kobject *kobj)
+{
+ struct afu_config_record *cr = to_cr(kobj);
+
+ kfree(cr);
+}
+
+static struct kobj_type afu_config_record_type = {
+ .sysfs_ops = &kobj_sysfs_ops,
+ .release = release_afu_config_record,
+ .default_attrs = afu_cr_attrs,
+};
+
+static struct afu_config_record *cxl_sysfs_afu_new_cr(struct cxl_afu *afu, int cr_idx)
+{
+ struct afu_config_record *cr;
+ int rc;
+
+ cr = kzalloc(sizeof(struct afu_config_record), GFP_KERNEL);
+ if (!cr)
+ return ERR_PTR(-ENOMEM);
+
+ cr->cr = cr_idx;
+ cr->device = cxl_afu_cr_read16(afu, cr_idx, PCI_DEVICE_ID);
+ cr->vendor = cxl_afu_cr_read16(afu, cr_idx, PCI_VENDOR_ID);
+ cr->class = cxl_afu_cr_read32(afu, cr_idx, PCI_CLASS_REVISION) >> 8;
+
+ /*
+ * 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
+ * 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
+ * AFUs, which can be done via the vendor, device and class attributes.
+ */
+ sysfs_bin_attr_init(&cr->config_attr);
+ cr->config_attr.attr.name = "config";
+ cr->config_attr.attr.mode = S_IRUSR;
+ cr->config_attr.size = afu->crs_len;
+ cr->config_attr.read = afu_read_config;
+
+ rc = kobject_init_and_add(&cr->kobj, &afu_config_record_type,
+ &afu->dev.kobj, "cr%i", cr->cr);
+ if (rc)
+ goto err;
+
+ rc = sysfs_create_bin_file(&cr->kobj, &cr->config_attr);
+ if (rc)
+ goto err1;
+
+ rc = kobject_uevent(&cr->kobj, KOBJ_ADD);
+ if (rc)
+ goto err2;
+
+ return cr;
+err2:
+ sysfs_remove_bin_file(&cr->kobj, &cr->config_attr);
+err1:
+ kobject_put(&cr->kobj);
+ return ERR_PTR(rc);
+err:
+ kfree(cr);
+ return ERR_PTR(rc);
+}
+
+void cxl_sysfs_afu_remove(struct cxl_afu *afu)
+{
+ struct afu_config_record *cr, *tmp;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(afu_attrs); i++)
+ device_remove_file(&afu->dev, &afu_attrs[i]);
+
+ list_for_each_entry_safe(cr, tmp, &afu->crs, list) {
+ sysfs_remove_bin_file(&cr->kobj, &cr->config_attr);
+ kobject_put(&cr->kobj);
+ }
+}
+
int cxl_sysfs_afu_add(struct cxl_afu *afu)
{
+ struct afu_config_record *cr;
int i, rc;
+ INIT_LIST_HEAD(&afu->crs);
+
for (i = 0; i < ARRAY_SIZE(afu_attrs); i++) {
if ((rc = device_create_file(&afu->dev, &afu_attrs[i])))
goto err;
}
+ for (i = 0; i < afu->crs_num; i++) {
+ cr = cxl_sysfs_afu_new_cr(afu, i);
+ if (IS_ERR(cr)) {
+ rc = PTR_ERR(cr);
+ goto err1;
+ }
+ list_add(&cr->list, &afu->crs);
+ }
+
return 0;
+err1:
+ cxl_sysfs_afu_remove(afu);
+ return rc;
err:
for (i--; i >= 0; i--)
device_remove_file(&afu->dev, &afu_attrs[i]);
return rc;
}
-void cxl_sysfs_afu_remove(struct cxl_afu *afu)
-{
- int i;
-
- for (i = 0; i < ARRAY_SIZE(afu_attrs); i++)
- device_remove_file(&afu->dev, &afu_attrs[i]);
-}
-
int cxl_sysfs_afu_m_add(struct cxl_afu *afu)
{
int i, rc;