qlcnic: sysfs interface for PCI BAR access

Orabug: 22066190

Signed-off-by: Sony Chacko <sony.chacko@qlogic.com>
Signed-off-by: Ethan Zhao <ethan.zhao@oracle.com>

diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sysfs.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sysfs.c
index 59a721fba018249679bf15d0984b90e4835c155e..6b93bc3a1be8bb614c2ae013fdf689416ce392aa 100644 (file)
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sysfs.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sysfs.c
@@ -1182,6 +1182,62 @@ static ssize_t qlcnic_83xx_sysfs_flash_write_handler(struct file *filp,
        return size;
 }
 
+static int qlcnic_sysfs_validate_bar(struct qlcnic_adapter *adapter,
+                                    loff_t offset, size_t size)
+{
+       size_t bar = 4;
+
+       if (!(adapter->flags & QLCNIC_DIAG_ENABLED))
+               return -EIO;
+
+       if (offset >= QLCNIC_83XX_BAR0_LENGTH || (offset & (bar - 1)) ||
+           (size != bar))
+               return -EINVAL;
+       return 0;
+}
+
+static ssize_t qlcnic_sysfs_read_bar(struct file *filp, struct kobject *kobj,
+                                    struct bin_attribute *attr, char *buf,
+                                    loff_t offset, size_t size)
+{
+       u32 data;
+       int ret;
+       struct device *dev = container_of(kobj, struct device, kobj);
+       struct qlcnic_adapter *adapter = dev_get_drvdata(dev);
+
+       ret = qlcnic_sysfs_validate_bar(adapter, offset, size);
+       if (ret != 0)
+               return ret;
+
+       mutex_lock(&adapter->ahw->mem_lock);
+       data = readl(adapter->ahw->pci_base0 + offset);
+       mutex_unlock(&adapter->ahw->mem_lock);
+
+       memcpy(buf, &data, size);
+       return size;
+}
+
+static ssize_t qlcnic_sysfs_write_bar(struct file *filp, struct kobject *kobj,
+                                     struct bin_attribute *attr, char *buf,
+                                     loff_t offset, size_t size)
+{
+       u32 data;
+       int ret;
+       struct device *dev = container_of(kobj, struct device, kobj);
+       struct qlcnic_adapter *adapter = dev_get_drvdata(dev);
+
+       ret = qlcnic_sysfs_validate_bar(adapter, offset, size);
+       if (ret != 0)
+               return ret;
+
+       memcpy(&data, buf, size);
+       mutex_lock(&adapter->ahw->mem_lock);
+       writel(data, adapter->ahw->pci_base0 + offset);
+       mutex_unlock(&adapter->ahw->mem_lock);
+
+       return size;
+}
+
 static struct device_attribute dev_attr_bridged_mode = {
        .attr = {.name = "bridged_mode", .mode = (S_IRUGO | S_IWUSR)},
        .show = qlcnic_show_bridged_mode,
@@ -1263,6 +1319,13 @@ static struct bin_attribute bin_attr_flash = {
        .write = qlcnic_83xx_sysfs_flash_write_handler,
 };
 
+static struct bin_attribute bin_attr_bar = {
+       .attr = {.name = "membar", .mode = (S_IRUGO | S_IWUSR)},
+       .size = 0,
+       .read = qlcnic_sysfs_read_bar,
+       .write = qlcnic_sysfs_write_bar,
+};
+
 #ifdef CONFIG_QLCNIC_HWMON
 
 static ssize_t qlcnic_hwmon_show_temp(struct device *dev,
@@ -1425,6 +1488,9 @@ void qlcnic_83xx_add_sysfs(struct qlcnic_adapter *adapter)
 
        qlcnic_create_diag_entries(adapter);
 
+       if (sysfs_create_bin_file(&dev->kobj, &bin_attr_bar))
+               dev_info(dev, "failed to create mem bar sysfs entry\n");
+
        if (sysfs_create_bin_file(&dev->kobj, &bin_attr_flash))
                dev_info(dev, "failed to create flash sysfs entry\n");
 }
@@ -1434,5 +1500,6 @@ void qlcnic_83xx_remove_sysfs(struct qlcnic_adapter *adapter)
        struct device *dev = &adapter->pdev->dev;
 
        qlcnic_remove_diag_entries(adapter);
+       sysfs_remove_bin_file(&dev->kobj, &bin_attr_bar);
        sysfs_remove_bin_file(&dev->kobj, &bin_attr_flash);
 }