Please review this patch and provide comments or feedback.
Patch 2 of 9
Thanks,
mikem
cciss_diskdump.c | 236 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 236 insertions(+)
--------------------------------------------------------------------------------
Description:
This patch will add the cciss_diskdump.c file to the block subdirectory of
the kernel. This file contains functions used by the cciss driver to perform
diskdump operations.
--------------------------------------------------------------------------------
diff -burpN old/drivers/block/cciss_diskdump.c new/drivers/block/cciss_diskdump.c
--- old/drivers/block/cciss_diskdump.c 1969-12-31 19:00:00.000000000 -0500
+++ new/drivers/block/cciss_diskdump.c 2005-04-07 20:49:12.000000000 -0400
@@ -0,0 +1,236 @@
+
+#include "cciss_cmd.h"
+
+/* global vars */
+static int quiesce_ok = 0;
+static CommandList_struct *cciss_dump_cmnd;
+static ReadCapdata_struct *size_buff;
+#define BLOCK_SECTOR(s) ((s) << (PAGE_SHIFT - 9))
+
+/* function prototypes */
+void *cciss_probe(kdev_t dev);
+static CommandList_struct * cmd_alloc(ctlr_info_t *h, int get_from_pool);
+static int cciss_dump_sanity_check(void *device);
+static int cciss_sanity_check(int ctlr, int lun);
+static int find_ctlr_lun_ids(int *ctlr, int *lun, __u32 LunID);
+static int cciss_dump_rw_block(void *device, int rw, unsigned long dump_block_nr, void *buf, int len, unsigned long start_sect, unsigned long nr_sects);
+static int cciss_dump_quiesce(void *device);
+static int cciss_dump_shutdown(void *device);
+static unsigned long diskdump_pollcomplete(int ctlr);
+static unsigned int cciss_add_device(void *device);
+static int sendcmd(__u8 cmd,int ctlr,void *buff,size_t size, unsigned int use_unit_num, unsigned int log_unit, __u8 page_code, unsigned char *scsi3addr, int block_nr, int diskdump);
+
+#if (CONFIG_BLOCKDUMP || CONFIG_BLOCKDUMP_MODULE)
+static struct block_dump_ops cciss_dump_device_ops = {
+ .sanity_check = cciss_dump_sanity_check,
+ .rw_block = cciss_dump_rw_block,
+ .quiesce = cciss_dump_quiesce,
+ .shutdown = cciss_dump_shutdown,
+};
+#endif
+
+/* Start of functions */
+
+/*
+ * Wait polling for a command to complete.
+ * The memory mapped FIFO is polled for the completion.
+ * Used only at dump time, interrupts disabled.
+ */
+static unsigned long diskdump_pollcomplete(int ctlr)
+{
+ unsigned long done;
+
+ while (1){
+ done = hba[ctlr]->access.command_completed(hba[ctlr]);
+ if (done == FIFO_EMPTY){
+ udelay(20);
+ continue;
+ }
+ else
+ return done;
+ }
+}
+
+/*Dummy function. Nothing to do here. */
+static int cciss_dump_shutdown(void *device) {
+ return 0;
+}
+
+static int cciss_dump_quiesce(void *device) {
+ drive_info_struct *dev = device;
+ int ret, ctlr, lun, temp;
+ char flush_buf[4];
+
+ if(find_ctlr_lun_ids(&ctlr, &lun, dev->LunID)){
+ printk("<1>Could not find controller or LUN.\n");
+ return -1;
+ }
+
+ memset(flush_buf, 0, 4);
+ ret = sendcmd(CCISS_CACHE_FLUSH, ctlr, flush_buf, 4, 0, 0, 0, NULL, 0, 1);
+ if (ret != IO_OK)
+ printk("<1>cciss%d: Error flushing cache\n", ctlr);
+
+ quiesce_ok = 1;
+
+ return 0;
+}
+
+static int cciss_dump_rw_block(void *device, int rw, unsigned long dump_block_nr, void *buf, int len, unsigned long start_sect, unsigned long nr_sects) {
+ drive_info_struct *dev = device;
+ int block_nr = BLOCK_SECTOR(dump_block_nr);
+
+ //this gives the number of bytes to write for len number
+ //of pages of memory.
+ int count = (len * PAGE_SIZE);
+ int ret;
+ int ctlr, lun;
+ __u8 cmd = CCISS_READ;
+
+ if(rw)
+ cmd = CCISS_WRITE;
+
+ if(find_ctlr_lun_ids(&ctlr, &lun, dev->LunID)){
+ printk("<1>Could not find controller or LUN.\n");
+ return -1;
+ }
+
+ if (!quiesce_ok) {
+ printk("<1>quiesce not called\n");
+ return -EIO;
+ }
+
+ /* Calculate start block to be used in the CDB command */
+ block_nr += start_sect;
+
+
+ if (block_nr + (count/hba[ctlr]->drv[lun].block_size) > nr_sects + start_sect) {
+ printk("<1>block number %d is larger than %lu\n",
+ block_nr + (count/hba[ctlr]->drv[lun].block_size), nr_sects);
+ return -EFBIG;
+ }
+
+ ret = sendcmd(cmd, ctlr, buf, (size_t)count, 1, lun, 0, NULL, block_nr, 1);
+ return ret;
+}
+
+static int cciss_sanity_check(int ctlr, int lun){
+ int block_size;
+ int total_size;
+ int return_code;
+
+ memset(size_buff, 0, sizeof(ReadCapdata_struct));
+
+ return_code = sendcmd(CCISS_READ_CAPACITY, ctlr, size_buff,
+ sizeof(ReadCapdata_struct), 1, lun, 0, NULL, 0, 1);
+
+ if (return_code == IO_OK) {
+ total_size = (0xff &
+ (unsigned int)(size_buff->total_size[0])) << 24;
+ total_size |= (0xff &
+ (unsigned int)(size_buff->total_size[1])) << 16;
+ total_size |= (0xff &
+ (unsigned int)(size_buff->total_size[2])) << 8;
+ total_size |= (0xff & (unsigned int)
+ (size_buff->total_size[3]));
+ total_size++; /* command returns highest */
+ /* block address */
+
+ block_size = (0xff &
+ (unsigned int)(size_buff->block_size[0])) << 24;
+ block_size |= (0xff &
+ (unsigned int)(size_buff->block_size[1])) << 16;
+ block_size |= (0xff &
+ (unsigned int)(size_buff->block_size[2])) << 8;
+ block_size |= (0xff &
+ (unsigned int)(size_buff->block_size[3]));
+
+ } else { /* read capacity command failed */
+ printk("<1>cciss: read capacity failed\n");
+ return -1;
+ }
+
+ if(hba[ctlr]->drv[lun].nr_blocks != total_size){
+ printk("block_size:%d, blocks:%d, blocks:%d\n", block_size, total_size, hba[ctlr]->drv[lun].nr_blocks );
+ printk("<1>cciss: blocks read do not match stored value\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+/*Will set ctlr and lun numbers if found and return 0. If not found it
+ will return 1 to indicate an error */
+static int find_ctlr_lun_ids(int *ctlr, int *lun, __u32 LunID){
+ int i, j;
+ *ctlr = -1;
+ *lun = -1;
+ for(i=0; i<MAX_CTLR; i++){
+ if(hba[i] != NULL){
+ for(j=0; j<NWD; j++){
+ if(hba[i]->drv[j].LunID == LunID) {
+ *ctlr = i;
+ *lun = j;
+ return 0;
+ }
+ }
+ }
+ }
+
+ return 1;
+}
+
+static int cciss_dump_sanity_check(void *device){
+ drive_info_struct *dev = device;
+ int ctlr, lun;
+ int adapter_sanity = 0;
+ int sanity = 0;
+
+ /* Find the controller and LUN by searching for the LUNID in our list
+ of known devices. If not found then throw an error */
+ if(find_ctlr_lun_ids(&ctlr, &lun, dev->LunID)){
+ printk("<1>Could not find controller or LUN.\n");
+ sanity=-1;
+ return sanity;
+ }
+
+ /* send a CCISS_READ_CAPACITY command here for the drive. If the
+ command succeeds then the drive is online. Then we will check
+ that the values we get back match what we have recorded. That
+ way we can tell if anything has changed */
+ adapter_sanity=cciss_sanity_check(ctlr, lun);
+
+ return sanity + adapter_sanity;
+}
+
+void *cciss_probe(kdev_t dev){
+ static int i=0;
+ int ctlr, target;
+ ctlr_info_t *info_p;
+
+ target = MINOR(dev) >> NWD_SHIFT;
+ ctlr = MAJOR(dev) - MAJOR_NR;
+
+ info_p= hba[ctlr];
+ cciss_dump_cmnd = cmd_alloc(info_p, 0);
+
+ size_buff = kmalloc(sizeof( ReadCapdata_struct), GFP_KERNEL);
+ if (size_buff == NULL) {
+ printk(KERN_ERR "cciss: out of memory\n");
+ return NULL;
+ }
+
+
+ /* If the LUN does not exist on the controller then we must
+ let diskdump know that this device is not valid */
+ if(hba[ctlr]->drv[target].nr_blocks == 0)
+ return NULL;
+
+ return (void *)&hba[ctlr]->drv[target];
+}
+
+static unsigned int cciss_add_device(void *device) {
+ drive_info_struct *dev = device;
+
+ return dev->nr_blocks;
+}
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