On resume after a suspend to ram, the kernel cannot access the drive in
it's host protected area. The problem has already been discussed here
http://marc.theaimsgroup.com/?l=linux-ide&m=112116787306723&w=2
My up to date bios does not let me disable hpa completly.
Here is a (very naive) patch for 2.6.15.6 that disables HPA on resume.
This is a terrible hack but it works for me.
Using this patch, doing a hdparm -I /dev/hda before and after the
supend/resume still shows the differences:
- R/W multiple sector transfer: Max = 16 Current = ?
+ R/W multiple sector transfer: Max = 16 Current = 16
...
- frozen
+ not frozen
I don't know if I should bother exploring further.
Regards,
--
Arnaud Cornet
diff -urp linux-2.6.15.6/drivers/ide/ide.c linux-2.6.15.6-hpa/drivers/ide/ide.c
--- linux-2.6.15.6/drivers/ide/ide.c 2006-02-10 08:22:48.000000000 +0100
+++ linux-2.6.15.6-hpa/drivers/ide/ide.c 2006-03-18 21:26:27.000000000 +0100
@@ -1239,6 +1239,7 @@ static int generic_ide_resume(struct dev
struct request rq;
struct request_pm_state rqpm;
ide_task_t args;
+ int ret;
memset(&rq, 0, sizeof(rq));
memset(&rqpm, 0, sizeof(rqpm));
@@ -1249,7 +1250,11 @@ static int generic_ide_resume(struct dev
rqpm.pm_step = ide_pm_state_start_resume;
rqpm.pm_state = PM_EVENT_ON;
- return ide_do_drive_cmd(drive, &rq, ide_head_wait);
+ ret = ide_do_drive_cmd(drive, &rq, ide_head_wait);
+
+ if (drive->has_hpa)
+ idedisk_disable_hpa(drive);
+ return ret;
}
int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
diff -urp linux-2.6.15.6/drivers/ide/ide-disk.c linux-2.6.15.6-hpa/drivers/ide/ide-disk.c
--- linux-2.6.15.6/drivers/ide/ide-disk.c 2006-02-10 08:22:48.000000000 +0100
+++ linux-2.6.15.6-hpa/drivers/ide/ide-disk.c 2006-03-18 22:04:30.000000000 +0100
@@ -504,11 +504,29 @@ static inline void idedisk_check_hpa(ide
set_max = idedisk_set_max_address(drive, set_max);
if (set_max) {
drive->capacity64 = set_max;
+ drive->has_hpa = 1;
printk(KERN_INFO "%s: Host Protected Area disabled.\n",
drive->name);
}
}
+void idedisk_disable_hpa(ide_drive_t *drive)
+{
+ int lba48 = idedisk_supports_lba48(drive->id);
+
+ /* On my machine idedisk_set_max_address has no efect if
+ * idedisk_read_native_max_address is not called before */
+ if (lba48) {
+ idedisk_read_native_max_address_ext(drive);
+ idedisk_set_max_address_ext(drive, drive->capacity64);
+ } else {
+ idedisk_read_native_max_address(drive);
+ idedisk_set_max_address(drive, drive->capacity64);
+ }
+ printk(KERN_INFO "%s: Host Protected Area disabled.\n",
+ drive->name);
+}
+
/*
* Compute drive->capacity, the full capacity of the drive
* Called with drive->id != NULL.
diff -urp linux-2.6.15.6/include/linux/ide.h linux-2.6.15.6-hpa/include/linux/ide.h
--- linux-2.6.15.6/include/linux/ide.h 2006-02-10 08:22:48.000000000 +0100
+++ linux-2.6.15.6-hpa/include/linux/ide.h 2006-03-18 22:00:18.000000000 +0100
@@ -602,6 +602,7 @@ typedef struct ide_drive_s {
unsigned scsi : 1; /* 0=default, 1=ide-scsi emulation */
unsigned sleeping : 1; /* 1=sleeping & sleep field valid */
unsigned post_reset : 1;
+ unsigned has_hpa : 1; /* host protected area detected */
u8 quirk_list; /* considered quirky, set for a specific host */
u8 init_speed; /* transfer rate set at boot */
