[PATCH 2/6] hpsa: make hpsa.hpsa_simple_mode=1 module parameter actually work

Stephen M. Cameron
2011-02-15T21:32:53Z

It's not enough to simple avoid putting the board into performant
mode, as we have to set up the interrupts differently, etc. When
I originally tested this module parameter, I tested it incorrectly
without realizing it, and the driver was running in performant mode
the whole time unbeknownst to me.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
---
drivers/scsi/hpsa.c | 37 +++++++++++++++++++++++--------------
drivers/scsi/hpsa.h | 1 +
2 files changed, 24 insertions(+), 14 deletions(-)

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 0f40de2..66ccacf 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -1186,7 +1186,7 @@ static int hpsa_scsi_detect(struct ctlr_info *h)
sh->sg_tablesize = h->maxsgentries;
h->scsi_host = sh;
sh->hostdata[0] = (unsigned long) h;
- sh->irq = h->intr[PERF_MODE_INT];
+ sh->irq = h->intr[h->intr_mode];
sh->unique_id = sh->irq;
error = scsi_add_host(sh, &h->pdev->dev);
if (error)
@@ -2902,10 +2902,14 @@ static inline u32 hpsa_tag_to_index(u32 tag)
return tag >> DIRECT_LOOKUP_SHIFT;
}

-static inline u32 hpsa_tag_discard_error_bits(u32 tag)
+
+static inline u32 hpsa_tag_discard_error_bits(struct ctlr_info *h, u32 tag)
{
-#define HPSA_ERROR_BITS 0x03
- return tag & ~HPSA_ERROR_BITS;
+#define HPSA_PERF_ERROR_BITS ((1 << DIRECT_LOOKUP_SHIFT) - 1)
+#define HPSA_SIMPLE_ERROR_BITS 0x03
+ if (unlikely(h->transMethod != CFGTBL_Trans_Performant))
+ return tag & ~HPSA_SIMPLE_ERROR_BITS;
+ return tag & ~HPSA_PERF_ERROR_BITS;
}

/* process completion of an indexed ("direct lookup") command */
@@ -2930,7 +2934,7 @@ static inline u32 process_nonindexed_cmd(struct ctlr_info *h,
u32 tag;
struct CommandList *c = NULL;

- tag = hpsa_tag_discard_error_bits(raw_tag);
+ tag = hpsa_tag_discard_error_bits(h, raw_tag);
list_for_each_entry(c, &h->cmpQ, list) {
if ((c->busaddr & 0xFFFFFFE0) == (tag & 0xFFFFFFE0)) {
finish_cmd(c, raw_tag);
@@ -2981,7 +2985,10 @@ static irqreturn_t do_hpsa_intr_msi(int irq, void *dev_id)
return IRQ_HANDLED;
}

-/* Send a message CDB to the firmware. */
+/* Send a message CDB to the firmware. Careful, this only works
+ * in simple mode, not performant mode due to the tag lookup.
+ * We only ever use this immediately after a controller reset.
+ */
static __devinit int hpsa_message(struct pci_dev *pdev, unsigned char opcode,
unsigned char type)
{
@@ -3047,7 +3054,7 @@ static __devinit int hpsa_message(struct pci_dev *pdev, unsigned char opcode,

for (i = 0; i < HPSA_MSG_SEND_RETRY_LIMIT; i++) {
tag = readl(vaddr + SA5_REPLY_PORT_OFFSET);
- if (hpsa_tag_discard_error_bits(tag) == paddr32)
+ if ((tag & ~HPSA_SIMPLE_ERROR_BITS) == paddr32)
break;
msleep(HPSA_MSG_SEND_RETRY_INTERVAL_MSECS);
}
@@ -3379,7 +3386,7 @@ static void __devinit hpsa_interrupt_mode(struct ctlr_info *h)
default_int_mode:
#endif /* CONFIG_PCI_MSI */
/* if we get here we're going to use the default interrupt mode */
- h->intr[PERF_MODE_INT] = h->pdev->irq;
+ h->intr[h->intr_mode] = h->pdev->irq;
}

static int __devinit hpsa_lookup_board_id(struct pci_dev *pdev, u32 *board_id)
@@ -3760,6 +3767,8 @@ static int __devinit hpsa_init_one(struct pci_dev *pdev,

h->pdev = pdev;
h->busy_initializing = 1;
+ h->intr_mode = hpsa_simple_mode ? SIMPLE_MODE_INT : PERF_MODE_INT;
+ printk(KERN_WARNING "hpsa_simple_mode is %d\n", hpsa_simple_mode);
INIT_LIST_HEAD(&h->cmpQ);
INIT_LIST_HEAD(&h->reqQ);
spin_lock_init(&h->lock);
@@ -3790,20 +3799,20 @@ static int __devinit hpsa_init_one(struct pci_dev *pdev,
h->access.set_intr_mask(h, HPSA_INTR_OFF);

if (h->msix_vector || h->msi_vector)
- rc = request_irq(h->intr[PERF_MODE_INT], do_hpsa_intr_msi,
+ rc = request_irq(h->intr[h->intr_mode], do_hpsa_intr_msi,
IRQF_DISABLED, h->devname, h);
else
- rc = request_irq(h->intr[PERF_MODE_INT], do_hpsa_intr_intx,
+ rc = request_irq(h->intr[h->intr_mode], do_hpsa_intr_intx,
IRQF_DISABLED, h->devname, h);
if (rc) {
dev_err(&pdev->dev, "unable to get irq %d for %s\n",
- h->intr[PERF_MODE_INT], h->devname);
+ h->intr[h->intr_mode], h->devname);
goto clean2;
}

dev_info(&pdev->dev, "%s: <0x%x> at IRQ %d%s using DAC\n",
h->devname, pdev->device,
- h->intr[PERF_MODE_INT], dac ? "" : " not");
+ h->intr[h->intr_mode], dac ? "" : " not");

h->cmd_pool_bits =
kmalloc(((h->nr_cmds + BITS_PER_LONG -
@@ -3854,7 +3863,7 @@ clean4:
h->nr_cmds * sizeof(struct ErrorInfo),
h->errinfo_pool,
h->errinfo_pool_dhandle);
- free_irq(h->intr[PERF_MODE_INT], h);
+ free_irq(h->intr[h->intr_mode], h);
clean2:
clean1:
h->busy_initializing = 0;
@@ -3898,7 +3907,7 @@ static void hpsa_shutdown(struct pci_dev *pdev)
*/
hpsa_flush_cache(h);
h->access.set_intr_mask(h, HPSA_INTR_OFF);
- free_irq(h->intr[PERF_MODE_INT], h);
+ free_irq(h->intr[h->intr_mode], h);
#ifdef CONFIG_PCI_MSI
if (h->msix_vector)
pci_disable_msix(h->pdev);
diff --git a/drivers/scsi/hpsa.h b/drivers/scsi/hpsa.h
index e898193..621a153 100644
--- a/drivers/scsi/hpsa.h
+++ b/drivers/scsi/hpsa.h
@@ -72,6 +72,7 @@ struct ctlr_info {
unsigned int intr[4];
unsigned int msix_vector;
unsigned int msi_vector;
+ int intr_mode; /* either PERF_MODE_INT or SIMPLE_MODE_INT */
struct access_method access;

/* queue and queue Info */