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authorJames Bottomley <James.Bottomley@suse.de>2011-03-18 11:24:23 -0400
committerJames Bottomley <James.Bottomley@suse.de>2011-03-23 11:37:09 -0500
commit8c3adc796f32fa4878ec843f8960717ba377e024 (patch)
tree993df6f496462a43839d8feadef3c1ae3ec4b855 /drivers/scsi/ses.c
parentd9f7f37b90e7b0180961cb6567ae423ac3757db8 (diff)
downloadlinux-8c3adc796f32fa4878ec843f8960717ba377e024.tar.bz2
[SCSI] ses: add subenclosure support
There have been many complaints that an enclosure with subenclosures isn't attached to by the ses driver. Until now, though, no-one had been willing to provide access to one. Subenclosures are added simply by flattening the tree (i.e. all subenclosure devices show up under the one main device). This may have consequences if the naming is only unique per subenclosure, but that's a bug for another day. The tested array had no page 7, so no device naming at all. It also only had the disk devices on one of its subenclosures (all the others had power, fans, temperature and various sensors), so testing of this is fairly rudimentary. Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/scsi/ses.c')
-rw-r--r--drivers/scsi/ses.c44
1 files changed, 25 insertions, 19 deletions
diff --git a/drivers/scsi/ses.c b/drivers/scsi/ses.c
index 3b00e907b917..eb7a3e85304f 100644
--- a/drivers/scsi/ses.c
+++ b/drivers/scsi/ses.c
@@ -35,9 +35,11 @@
struct ses_device {
unsigned char *page1;
+ unsigned char *page1_types;
unsigned char *page2;
unsigned char *page10;
short page1_len;
+ short page1_num_types;
short page2_len;
short page10_len;
};
@@ -110,12 +112,12 @@ static int ses_set_page2_descriptor(struct enclosure_device *edev,
int i, j, count = 0, descriptor = ecomp->number;
struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
struct ses_device *ses_dev = edev->scratch;
- unsigned char *type_ptr = ses_dev->page1 + 12 + ses_dev->page1[11];
+ unsigned char *type_ptr = ses_dev->page1_types;
unsigned char *desc_ptr = ses_dev->page2 + 8;
/* Clear everything */
memset(desc_ptr, 0, ses_dev->page2_len - 8);
- for (i = 0; i < ses_dev->page1[10]; i++, type_ptr += 4) {
+ for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
for (j = 0; j < type_ptr[1]; j++) {
desc_ptr += 4;
if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
@@ -140,12 +142,12 @@ static unsigned char *ses_get_page2_descriptor(struct enclosure_device *edev,
int i, j, count = 0, descriptor = ecomp->number;
struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
struct ses_device *ses_dev = edev->scratch;
- unsigned char *type_ptr = ses_dev->page1 + 12 + ses_dev->page1[11];
+ unsigned char *type_ptr = ses_dev->page1_types;
unsigned char *desc_ptr = ses_dev->page2 + 8;
ses_recv_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
- for (i = 0; i < ses_dev->page1[10]; i++, type_ptr += 4) {
+ for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
for (j = 0; j < type_ptr[1]; j++) {
desc_ptr += 4;
if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
@@ -358,7 +360,7 @@ static void ses_enclosure_data_process(struct enclosure_device *edev,
unsigned char *buf = NULL, *type_ptr, *desc_ptr, *addl_desc_ptr = NULL;
int i, j, page7_len, len, components;
struct ses_device *ses_dev = edev->scratch;
- int types = ses_dev->page1[10];
+ int types = ses_dev->page1_num_types;
unsigned char *hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
if (!hdr_buf)
@@ -393,7 +395,7 @@ static void ses_enclosure_data_process(struct enclosure_device *edev,
}
if (ses_dev->page10)
addl_desc_ptr = ses_dev->page10 + 8;
- type_ptr = ses_dev->page1 + 12 + ses_dev->page1[11];
+ type_ptr = ses_dev->page1_types;
components = 0;
for (i = 0; i < types; i++, type_ptr += 4) {
for (j = 0; j < type_ptr[1]; j++) {
@@ -503,6 +505,7 @@ static int ses_intf_add(struct device *cdev,
u32 result;
int i, types, len, components = 0;
int err = -ENOMEM;
+ int num_enclosures;
struct enclosure_device *edev;
struct ses_component *scomp = NULL;
@@ -530,16 +533,6 @@ static int ses_intf_add(struct device *cdev,
if (result)
goto recv_failed;
- if (hdr_buf[1] != 0) {
- /* FIXME: need subenclosure support; I've just never
- * seen a device with subenclosures and it makes the
- * traversal routines more complex */
- sdev_printk(KERN_ERR, sdev,
- "FIXME driver has no support for subenclosures (%d)\n",
- hdr_buf[1]);
- goto err_free;
- }
-
len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
buf = kzalloc(len, GFP_KERNEL);
if (!buf)
@@ -549,11 +542,24 @@ static int ses_intf_add(struct device *cdev,
if (result)
goto recv_failed;
- types = buf[10];
+ types = 0;
- type_ptr = buf + 12 + buf[11];
+ /* we always have one main enclosure and the rest are referred
+ * to as secondary subenclosures */
+ num_enclosures = buf[1] + 1;
- for (i = 0; i < types; i++, type_ptr += 4) {
+ /* begin at the enclosure descriptor */
+ type_ptr = buf + 8;
+ /* skip all the enclosure descriptors */
+ for (i = 0; i < num_enclosures && type_ptr < buf + len; i++) {
+ types += type_ptr[2];
+ type_ptr += type_ptr[3] + 4;
+ }
+
+ ses_dev->page1_types = type_ptr;
+ ses_dev->page1_num_types = types;
+
+ for (i = 0; i < types && type_ptr < buf + len; i++, type_ptr += 4) {
if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE)
components += type_ptr[1];