[SCSI] stex: add small dma buffer support
The controllers of st_seq and st_vsc type can work
if only small dma buffer is available, with a reduced
firmware feature set. Add support for this case.
Signed-off-by: Ed Lin <ed.lin@promise.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
diff --git a/drivers/scsi/stex.c b/drivers/scsi/stex.c
index 09fa886..af5bafc 100644
--- a/drivers/scsi/stex.c
+++ b/drivers/scsi/stex.c
@@ -160,6 +160,7 @@
INQUIRY_EVPD = 0x01,
ST_ADDITIONAL_MEM = 0x200000,
+ ST_ADDITIONAL_MEM_MIN = 0x80000,
};
struct st_sgitem {
@@ -1001,7 +1002,7 @@
h->partner_type = HMU_PARTNER_TYPE;
if (hba->extra_offset) {
h->extra_offset = cpu_to_le32(hba->extra_offset);
- h->extra_size = cpu_to_le32(ST_ADDITIONAL_MEM);
+ h->extra_size = cpu_to_le32(hba->dma_size - hba->extra_offset);
} else
h->extra_offset = h->extra_size = 0;
@@ -1528,10 +1529,24 @@
hba->dma_mem = dma_alloc_coherent(&pdev->dev,
hba->dma_size, &hba->dma_handle, GFP_KERNEL);
if (!hba->dma_mem) {
- err = -ENOMEM;
- printk(KERN_ERR DRV_NAME "(%s): dma mem alloc failed\n",
- pci_name(pdev));
- goto out_iounmap;
+ /* Retry minimum coherent mapping for st_seq and st_vsc */
+ if (hba->cardtype == st_seq ||
+ (hba->cardtype == st_vsc && (pdev->subsystem_device & 1))) {
+ printk(KERN_WARNING DRV_NAME
+ "(%s): allocating min buffer for controller\n",
+ pci_name(pdev));
+ hba->dma_size = hba->extra_offset
+ + ST_ADDITIONAL_MEM_MIN;
+ hba->dma_mem = dma_alloc_coherent(&pdev->dev,
+ hba->dma_size, &hba->dma_handle, GFP_KERNEL);
+ }
+
+ if (!hba->dma_mem) {
+ err = -ENOMEM;
+ printk(KERN_ERR DRV_NAME "(%s): dma mem alloc failed\n",
+ pci_name(pdev));
+ goto out_iounmap;
+ }
}
hba->ccb = kcalloc(ci->rq_count, sizeof(struct st_ccb), GFP_KERNEL);