[SCSI] ipr: Write caching state host attribute

Adds a scsi_host sysfs attribute and module parm to enable/disable
the write cache on an ipr adapter.

Signed-off-by: Brian King <brking@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/drivers/scsi/ipr.h b/drivers/scsi/ipr.h
index b8c1603f99eb..6d9aef001fe7 100644
--- a/drivers/scsi/ipr.h
+++ b/drivers/scsi/ipr.h
@@ -541,6 +541,15 @@ struct ipr_inquiry_page3 {
         u8 patch_number[4];
 }__attribute__((packed));
 
+#define IPR_INQUIRY_PAGE0_ENTRIES 20
+struct ipr_inquiry_page0 {
+        u8 peri_qual_dev_type;
+        u8 page_code;
+        u8 reserved1;
+        u8 len;
+        u8 page[IPR_INQUIRY_PAGE0_ENTRIES];
+}__attribute__((packed));
+
 struct ipr_hostrcb_device_data_entry {
         struct ipr_vpd vpd;
         struct ipr_res_addr dev_res_addr;
@@ -731,6 +740,7 @@ struct ipr_resource_table {
 
 struct ipr_misc_cbs {
         struct ipr_ioa_vpd ioa_vpd;
+        struct ipr_inquiry_page0 page0_data;
         struct ipr_inquiry_page3 page3_data;
         struct ipr_mode_pages mode_pages;
         struct ipr_supported_device supp_dev;
@@ -813,6 +823,13 @@ enum ipr_sdt_state {
         DUMP_OBTAINED
 };
 
+enum ipr_cache_state {
+        CACHE_NONE,
+        CACHE_DISABLED,
+        CACHE_ENABLED,
+        CACHE_INVALID
+};
+
 /* Per-controller data */
 struct ipr_ioa_cfg {
         char eye_catcher[8];
@@ -829,6 +846,7 @@ struct ipr_ioa_cfg {
         u8 allow_cmds:1;
         u8 allow_ml_add_del:1;
 
+        enum ipr_cache_state cache_state;
         u16 type; /* CCIN of the card */
 
         u8 log_level;