/*
* sx8.c: Driver for Promise SATA SX8 looks-like-I2O hardware
*
- * Copyright 2004 Red Hat, Inc.
+ * Copyright 2004-2005 Red Hat, Inc.
*
* Author/maintainer: Jeff Garzik <jgarzik@pobox.com>
*
#include <asm/semaphore.h>
#include <asm/uaccess.h>
-MODULE_AUTHOR("Jeff Garzik");
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("Promise SATA SX8 block driver");
-
#if 0
#define CARM_DEBUG
#define CARM_VERBOSE_DEBUG
#undef CARM_NDEBUG
#define DRV_NAME "sx8"
-#define DRV_VERSION "0.8"
+#define DRV_VERSION "1.0"
#define PFX DRV_NAME ": "
+MODULE_AUTHOR("Jeff Garzik");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Promise SATA SX8 block driver");
+MODULE_VERSION(DRV_VERSION);
+
+/*
+ * SX8 hardware has a single message queue for all ATA ports.
+ * When this driver was written, the hardware (firmware?) would
+ * corrupt data eventually, if more than one request was outstanding.
+ * As one can imagine, having 8 ports bottlenecking on a single
+ * command hurts performance.
+ *
+ * Based on user reports, later versions of the hardware (firmware?)
+ * seem to be able to survive with more than one command queued.
+ *
+ * Therefore, we default to the safe option -- 1 command -- but
+ * allow the user to increase this.
+ *
+ * SX8 should be able to support up to ~60 queued commands (CARM_MAX_REQ),
+ * but problems seem to occur when you exceed ~30, even on newer hardware.
+ */
+static int max_queue = 1;
+module_param(max_queue, int, 0444);
+MODULE_PARM_DESC(max_queue, "Maximum number of queued commands. (min==1, max==30, safe==1)");
+
+
#define NEXT_RESP(idx) ((idx + 1) % RMSG_Q_LEN)
/* 0xf is just arbitrary, non-zero noise; this is sorta like poisoning */
/* command message queue limits */
CARM_MAX_REQ = 64, /* max command msgs per host */
- CARM_MAX_Q = 1, /* one command at a time */
CARM_MSG_LOW_WATER = (CARM_MAX_REQ / 4), /* refill mark */
/* S/G limits, host-wide and per-request */
CARM_MAX_REQ_SG = 32, /* max s/g entries per request */
- CARM_SG_BOUNDARY = 0xffffUL, /* s/g segment boundary */
CARM_MAX_HOST_SG = 600, /* max s/g entries per host */
CARM_SG_LOW_WATER = (CARM_MAX_HOST_SG / 4), /* re-fill mark */
FL_DYN_MAJOR = (1 << 17),
};
+enum {
+ CARM_SG_BOUNDARY = 0xffffUL, /* s/g segment boundary */
+};
+
enum scatter_gather_types {
SGT_32BIT = 0,
SGT_64BIT = 1,
struct carm_port {
unsigned int port_no;
- unsigned int n_queued;
struct gendisk *disk;
struct carm_host *host;
static int carm_init_one (struct pci_dev *pdev, const struct pci_device_id *ent);
static void carm_remove_one (struct pci_dev *pdev);
-static int carm_bdev_ioctl(struct inode *ino, struct file *fil,
- unsigned int cmd, unsigned long arg);
+static int carm_bdev_getgeo(struct block_device *bdev, struct hd_geometry *geo);
static struct pci_device_id carm_pci_tbl[] = {
{ PCI_VENDOR_ID_PROMISE, 0x8000, PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
static struct block_device_operations carm_bd_ops = {
.owner = THIS_MODULE,
- .ioctl = carm_bdev_ioctl,
+ .getgeo = carm_bdev_getgeo,
};
static unsigned int carm_host_id;
-static int carm_bdev_ioctl(struct inode *ino, struct file *fil,
- unsigned int cmd, unsigned long arg)
+static int carm_bdev_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
- void __user *usermem = (void __user *) arg;
- struct carm_port *port = ino->i_bdev->bd_disk->private_data;
- struct hd_geometry geom;
-
- switch (cmd) {
- case HDIO_GETGEO:
- if (!usermem)
- return -EINVAL;
-
- geom.heads = (u8) port->dev_geom_head;
- geom.sectors = (u8) port->dev_geom_sect;
- geom.cylinders = port->dev_geom_cyl;
- geom.start = get_start_sect(ino->i_bdev);
-
- if (copy_to_user(usermem, &geom, sizeof(geom)))
- return -EFAULT;
- return 0;
+ struct carm_port *port = bdev->bd_disk->private_data;
- default:
- break;
- }
-
- return -EOPNOTSUPP;
+ geo->heads = (u8) port->dev_geom_head;
+ geo->sectors = (u8) port->dev_geom_sect;
+ geo->cylinders = port->dev_geom_cyl;
+ return 0;
}
static const u32 msg_sizes[] = { 32, 64, 128, CARM_MSG_SIZE };
for (i = 0; i < ARRAY_SIZE(msg_sizes); i++)
if (msg_size <= msg_sizes[i])
return i;
-
+
return -ENOENT;
}
if (host->hw_sg_used >= (CARM_MAX_HOST_SG - CARM_MAX_REQ_SG))
return NULL;
- for (i = 0; i < CARM_MAX_Q; i++)
+ for (i = 0; i < max_queue; i++)
if ((host->msg_alloc & (1ULL << i)) == 0) {
struct carm_request *crq = &host->req[i];
crq->port = NULL;
assert(host->n_msgs <= CARM_MAX_REQ);
return crq;
}
-
+
DPRINTK("no request available, returning NULL\n");
return NULL;
}
static int carm_put_request(struct carm_host *host, struct carm_request *crq)
{
- assert(crq->tag < CARM_MAX_Q);
+ assert(crq->tag < max_queue);
if (unlikely((host->msg_alloc & (1ULL << crq->tag)) == 0))
return -EINVAL; /* tried to clear a tag that was not active */
rc = end_that_request_first(req, uptodate, req->hard_nr_sectors);
assert(rc == 0);
- end_that_request_last(req);
+ end_that_request_last(req, uptodate);
rc = carm_put_request(host, crq);
assert(rc == 0);
int is_ok)
{
carm_end_request_queued(host, crq, is_ok);
- if (CARM_MAX_Q == 1)
+ if (max_queue == 1)
carm_round_robin(host);
else if ((host->n_msgs <= CARM_MSG_LOW_WATER) &&
(host->hw_sg_used <= CARM_SG_LOW_WATER)) {
if (rc)
goto err_out;
-#if IF_64BIT_DMA_IS_POSSIBLE /* grrrr... */
+#ifdef IF_64BIT_DMA_IS_POSSIBLE /* grrrr... */
rc = pci_set_dma_mask(pdev, DMA_64BIT_MASK);
if (!rc) {
rc = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK);
goto err_out_regions;
}
pci_dac = 0;
-#if IF_64BIT_DMA_IS_POSSIBLE /* grrrr... */
+#ifdef IF_64BIT_DMA_IS_POSSIBLE /* grrrr... */
}
#endif
git.samba.org / sfrench / cifs-2.6.git / blobdiff