[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>
This commit is contained in:
brking@us.ibm.com 2005-11-01 17:01:14 -06:00 committed by James Bottomley
parent 692aebfc69
commit 622750406a
2 changed files with 210 additions and 9 deletions

View file

@ -91,6 +91,7 @@ static unsigned int ipr_max_speed = 1;
static int ipr_testmode = 0;
static unsigned int ipr_fastfail = 0;
static unsigned int ipr_transop_timeout = IPR_OPERATIONAL_TIMEOUT;
static unsigned int ipr_enable_cache = 1;
static DEFINE_SPINLOCK(ipr_driver_lock);
/* This table describes the differences between DMA controller chips */
@ -150,6 +151,8 @@ module_param_named(fastfail, ipr_fastfail, int, 0);
MODULE_PARM_DESC(fastfail, "Reduce timeouts and retries");
module_param_named(transop_timeout, ipr_transop_timeout, int, 0);
MODULE_PARM_DESC(transop_timeout, "Time in seconds to wait for adapter to come operational (default: 300)");
module_param_named(enable_cache, ipr_enable_cache, int, 0);
MODULE_PARM_DESC(enable_cache, "Enable adapter's non-volatile write cache (default: 1)");
MODULE_LICENSE("GPL");
MODULE_VERSION(IPR_DRIVER_VERSION);
@ -1937,6 +1940,103 @@ static struct bin_attribute ipr_trace_attr = {
};
#endif
static const struct {
enum ipr_cache_state state;
char *name;
} cache_state [] = {
{ CACHE_NONE, "none" },
{ CACHE_DISABLED, "disabled" },
{ CACHE_ENABLED, "enabled" }
};
/**
* ipr_show_write_caching - Show the write caching attribute
* @class_dev: class device struct
* @buf: buffer
*
* Return value:
* number of bytes printed to buffer
**/
static ssize_t ipr_show_write_caching(struct class_device *class_dev, char *buf)
{
struct Scsi_Host *shost = class_to_shost(class_dev);
struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;
unsigned long lock_flags = 0;
int i, len = 0;
spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
for (i = 0; i < ARRAY_SIZE(cache_state); i++) {
if (cache_state[i].state == ioa_cfg->cache_state) {
len = snprintf(buf, PAGE_SIZE, "%s\n", cache_state[i].name);
break;
}
}
spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
return len;
}
/**
* ipr_store_write_caching - Enable/disable adapter write cache
* @class_dev: class_device struct
* @buf: buffer
* @count: buffer size
*
* This function will enable/disable adapter write cache.
*
* Return value:
* count on success / other on failure
**/
static ssize_t ipr_store_write_caching(struct class_device *class_dev,
const char *buf, size_t count)
{
struct Scsi_Host *shost = class_to_shost(class_dev);
struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;
unsigned long lock_flags = 0;
enum ipr_cache_state new_state = CACHE_INVALID;
int i;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (ioa_cfg->cache_state == CACHE_NONE)
return -EINVAL;
for (i = 0; i < ARRAY_SIZE(cache_state); i++) {
if (!strncmp(cache_state[i].name, buf, strlen(cache_state[i].name))) {
new_state = cache_state[i].state;
break;
}
}
if (new_state != CACHE_DISABLED && new_state != CACHE_ENABLED)
return -EINVAL;
spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
if (ioa_cfg->cache_state == new_state) {
spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
return count;
}
ioa_cfg->cache_state = new_state;
dev_info(&ioa_cfg->pdev->dev, "%s adapter write cache.\n",
new_state == CACHE_ENABLED ? "Enabling" : "Disabling");
if (!ioa_cfg->in_reset_reload)
ipr_initiate_ioa_reset(ioa_cfg, IPR_SHUTDOWN_NORMAL);
spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
wait_event(ioa_cfg->reset_wait_q, !ioa_cfg->in_reset_reload);
return count;
}
static struct class_device_attribute ipr_ioa_cache_attr = {
.attr = {
.name = "write_cache",
.mode = S_IRUGO | S_IWUSR,
},
.show = ipr_show_write_caching,
.store = ipr_store_write_caching
};
/**
* ipr_show_fw_version - Show the firmware version
* @class_dev: class device struct
@ -2406,6 +2506,7 @@ static struct class_device_attribute *ipr_ioa_attrs[] = {
&ipr_diagnostics_attr,
&ipr_ioa_reset_attr,
&ipr_update_fw_attr,
&ipr_ioa_cache_attr,
NULL,
};
@ -4147,6 +4248,36 @@ static int ipr_set_supported_devs(struct ipr_cmnd *ipr_cmd)
return IPR_RC_JOB_CONTINUE;
}
/**
* ipr_setup_write_cache - Disable write cache if needed
* @ipr_cmd: ipr command struct
*
* This function sets up adapters write cache to desired setting
*
* Return value:
* IPR_RC_JOB_CONTINUE / IPR_RC_JOB_RETURN
**/
static int ipr_setup_write_cache(struct ipr_cmnd *ipr_cmd)
{
struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;
ipr_cmd->job_step = ipr_set_supported_devs;
ipr_cmd->u.res = list_entry(ioa_cfg->used_res_q.next,
struct ipr_resource_entry, queue);
if (ioa_cfg->cache_state != CACHE_DISABLED)
return IPR_RC_JOB_CONTINUE;
ipr_cmd->ioarcb.res_handle = cpu_to_be32(IPR_IOA_RES_HANDLE);
ipr_cmd->ioarcb.cmd_pkt.request_type = IPR_RQTYPE_IOACMD;
ipr_cmd->ioarcb.cmd_pkt.cdb[0] = IPR_IOA_SHUTDOWN;
ipr_cmd->ioarcb.cmd_pkt.cdb[1] = IPR_SHUTDOWN_PREPARE_FOR_NORMAL;
ipr_do_req(ipr_cmd, ipr_reset_ioa_job, ipr_timeout, IPR_INTERNAL_TIMEOUT);
return IPR_RC_JOB_RETURN;
}
/**
* ipr_get_mode_page - Locate specified mode page
* @mode_pages: mode page buffer
@ -4358,10 +4489,7 @@ static int ipr_ioafp_mode_select_page28(struct ipr_cmnd *ipr_cmd)
ioa_cfg->vpd_cbs_dma + offsetof(struct ipr_misc_cbs, mode_pages),
length);
ipr_cmd->job_step = ipr_set_supported_devs;
ipr_cmd->u.res = list_entry(ioa_cfg->used_res_q.next,
struct ipr_resource_entry, queue);
ipr_cmd->job_step = ipr_setup_write_cache;
ipr_do_req(ipr_cmd, ipr_reset_ioa_job, ipr_timeout, IPR_INTERNAL_TIMEOUT);
LEAVE;
@ -4580,6 +4708,27 @@ static void ipr_ioafp_inquiry(struct ipr_cmnd *ipr_cmd, u8 flags, u8 page,
LEAVE;
}
/**
* ipr_inquiry_page_supported - Is the given inquiry page supported
* @page0: inquiry page 0 buffer
* @page: page code.
*
* This function determines if the specified inquiry page is supported.
*
* Return value:
* 1 if page is supported / 0 if not
**/
static int ipr_inquiry_page_supported(struct ipr_inquiry_page0 *page0, u8 page)
{
int i;
for (i = 0; i < min_t(u8, page0->len, IPR_INQUIRY_PAGE0_ENTRIES); i++)
if (page0->page[i] == page)
return 1;
return 0;
}
/**
* ipr_ioafp_page3_inquiry - Send a Page 3 Inquiry to the adapter.
* @ipr_cmd: ipr command struct
@ -4591,6 +4740,36 @@ static void ipr_ioafp_inquiry(struct ipr_cmnd *ipr_cmd, u8 flags, u8 page,
* IPR_RC_JOB_CONTINUE / IPR_RC_JOB_RETURN
**/
static int ipr_ioafp_page3_inquiry(struct ipr_cmnd *ipr_cmd)
{
struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;
struct ipr_inquiry_page0 *page0 = &ioa_cfg->vpd_cbs->page0_data;
ENTER;
if (!ipr_inquiry_page_supported(page0, 1))
ioa_cfg->cache_state = CACHE_NONE;
ipr_cmd->job_step = ipr_ioafp_query_ioa_cfg;
ipr_ioafp_inquiry(ipr_cmd, 1, 3,
ioa_cfg->vpd_cbs_dma + offsetof(struct ipr_misc_cbs, page3_data),
sizeof(struct ipr_inquiry_page3));
LEAVE;
return IPR_RC_JOB_RETURN;
}
/**
* ipr_ioafp_page0_inquiry - Send a Page 0 Inquiry to the adapter.
* @ipr_cmd: ipr command struct
*
* This function sends a Page 0 inquiry to the adapter
* to retrieve supported inquiry pages.
*
* Return value:
* IPR_RC_JOB_CONTINUE / IPR_RC_JOB_RETURN
**/
static int ipr_ioafp_page0_inquiry(struct ipr_cmnd *ipr_cmd)
{
struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;
char type[5];
@ -4602,11 +4781,11 @@ static int ipr_ioafp_page3_inquiry(struct ipr_cmnd *ipr_cmd)
type[4] = '\0';
ioa_cfg->type = simple_strtoul((char *)type, NULL, 16);
ipr_cmd->job_step = ipr_ioafp_query_ioa_cfg;
ipr_cmd->job_step = ipr_ioafp_page3_inquiry;
ipr_ioafp_inquiry(ipr_cmd, 1, 3,
ioa_cfg->vpd_cbs_dma + offsetof(struct ipr_misc_cbs, page3_data),
sizeof(struct ipr_inquiry_page3));
ipr_ioafp_inquiry(ipr_cmd, 1, 0,
ioa_cfg->vpd_cbs_dma + offsetof(struct ipr_misc_cbs, page0_data),
sizeof(struct ipr_inquiry_page0));
LEAVE;
return IPR_RC_JOB_RETURN;
@ -4626,7 +4805,7 @@ static int ipr_ioafp_std_inquiry(struct ipr_cmnd *ipr_cmd)
struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;
ENTER;
ipr_cmd->job_step = ipr_ioafp_page3_inquiry;
ipr_cmd->job_step = ipr_ioafp_page0_inquiry;
ipr_ioafp_inquiry(ipr_cmd, 0, 0,
ioa_cfg->vpd_cbs_dma + offsetof(struct ipr_misc_cbs, ioa_vpd),
@ -5629,6 +5808,10 @@ static void __devinit ipr_init_ioa_cfg(struct ipr_ioa_cfg *ioa_cfg,
INIT_WORK(&ioa_cfg->work_q, ipr_worker_thread, ioa_cfg);
init_waitqueue_head(&ioa_cfg->reset_wait_q);
ioa_cfg->sdt_state = INACTIVE;
if (ipr_enable_cache)
ioa_cfg->cache_state = CACHE_ENABLED;
else
ioa_cfg->cache_state = CACHE_DISABLED;
ipr_initialize_bus_attr(ioa_cfg);

View file

@ -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;