diff options
| -rw-r--r-- | drivers/ata/libata-acpi.c | 69 | ||||
| -rw-r--r-- | include/linux/libata.h | 1 |
2 files changed, 50 insertions, 20 deletions
diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c index b3aeca368774..e0dd132fd490 100644 --- a/drivers/ata/libata-acpi.c +++ b/drivers/ata/libata-acpi.c @@ -41,6 +41,12 @@ static int is_pci_dev(struct device *dev) return (dev->bus == &pci_bus_type); } +static void ata_acpi_clear_gtf(struct ata_device *dev) +{ + kfree(dev->gtf_cache); + dev->gtf_cache = NULL; +} + /** * ata_acpi_associate_sata_port - associate SATA port with ACPI objects * @ap: target SATA port @@ -327,7 +333,6 @@ EXPORT_SYMBOL_GPL(ata_acpi_stm); * ata_dev_get_GTF - get the drive bootup default taskfile settings * @dev: target ATA device * @gtf: output parameter for buffer containing _GTF taskfile arrays - * @ptr_to_free: pointer which should be freed * * This applies to both PATA and SATA drives. * @@ -344,8 +349,7 @@ EXPORT_SYMBOL_GPL(ata_acpi_stm); * Number of taskfiles on success, 0 if _GTF doesn't exist or doesn't * contain valid data. */ -static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf, - void **ptr_to_free) +static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf) { struct ata_port *ap = dev->link->ap; acpi_status status; @@ -353,6 +357,12 @@ static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf, union acpi_object *out_obj; int rc = 0; + /* if _GTF is cached, use the cached value */ + if (dev->gtf_cache) { + out_obj = dev->gtf_cache; + goto done; + } + /* set up output buffer */ output.length = ACPI_ALLOCATE_BUFFER; output.pointer = NULL; /* ACPI-CA sets this; save/free it later */ @@ -363,6 +373,7 @@ static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf, /* _GTF has no input parameters */ status = acpi_evaluate_object(dev->acpi_handle, "_GTF", NULL, &output); + out_obj = dev->gtf_cache = output.pointer; if (ACPI_FAILURE(status)) { if (status != AE_NOT_FOUND) { @@ -383,7 +394,6 @@ static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf, goto out_free; } - out_obj = output.pointer; if (out_obj->type != ACPI_TYPE_BUFFER) { ata_dev_printk(dev, KERN_WARNING, "_GTF unexpected object type 0x%x\n", @@ -398,18 +408,19 @@ static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf, goto out_free; } - *ptr_to_free = out_obj; - *gtf = (void *)out_obj->buffer.pointer; + done: rc = out_obj->buffer.length / REGS_PER_GTF; - - if (ata_msg_probe(ap)) - ata_dev_printk(dev, KERN_DEBUG, "%s: returning " - "gtf=%p, gtf_count=%d, ptr_to_free=%p\n", - __FUNCTION__, *gtf, rc, *ptr_to_free); + if (gtf) { + *gtf = (void *)out_obj->buffer.pointer; + if (ata_msg_probe(ap)) + ata_dev_printk(dev, KERN_DEBUG, + "%s: returning gtf=%p, gtf_count=%d\n", + __FUNCTION__, *gtf, rc); + } return rc; out_free: - kfree(output.pointer); + ata_acpi_clear_gtf(dev); return rc; } @@ -533,11 +544,10 @@ static int taskfile_load_raw(struct ata_device *dev, static int ata_acpi_exec_tfs(struct ata_device *dev) { struct ata_acpi_gtf *gtf = NULL; - void *ptr_to_free = NULL; int gtf_count, i, rc; /* get taskfiles */ - gtf_count = ata_dev_get_GTF(dev, >f, &ptr_to_free); + gtf_count = ata_dev_get_GTF(dev, >f); /* execute them */ for (i = 0, rc = 0; i < gtf_count; i++) { @@ -551,7 +561,7 @@ static int ata_acpi_exec_tfs(struct ata_device *dev) rc = tmp; } - kfree(ptr_to_free); + ata_acpi_clear_gtf(dev); if (rc == 0) return gtf_count; @@ -644,13 +654,31 @@ void ata_acpi_on_resume(struct ata_port *ap) const struct ata_acpi_gtm *gtm = ata_acpi_init_gtm(ap); struct ata_device *dev; - /* restore timing parameters */ - if (ap->acpi_handle && gtm) + if (ap->acpi_handle && gtm) { + /* _GTM valid */ + + /* restore timing parameters */ ata_acpi_stm(ap, gtm); - /* schedule _GTF */ - ata_link_for_each_dev(dev, &ap->link) - dev->flags |= ATA_DFLAG_ACPI_PENDING; + /* _GTF should immediately follow _STM so that it can + * use values set by _STM. Cache _GTF result and + * schedule _GTF. + */ + ata_link_for_each_dev(dev, &ap->link) { + ata_acpi_clear_gtf(dev); + if (ata_dev_get_GTF(dev, NULL) >= 0) + dev->flags |= ATA_DFLAG_ACPI_PENDING; + } + } else { + /* SATA _GTF needs to be evaulated after _SDD and + * there's no reason to evaluate IDE _GTF early + * without _STM. Clear cache and schedule _GTF. + */ + ata_link_for_each_dev(dev, &ap->link) { + ata_acpi_clear_gtf(dev); + dev->flags |= ATA_DFLAG_ACPI_PENDING; + } + } } /** @@ -735,4 +763,5 @@ int ata_acpi_on_devcfg(struct ata_device *dev) */ void ata_acpi_on_disable(struct ata_device *dev) { + ata_acpi_clear_gtf(dev); } diff --git a/include/linux/libata.h b/include/linux/libata.h index ba84d8a37545..cb91280be9bd 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -498,6 +498,7 @@ struct ata_device { struct scsi_device *sdev; /* attached SCSI device */ #ifdef CONFIG_ATA_ACPI acpi_handle acpi_handle; + union acpi_object *gtf_cache; #endif /* n_sector is used as CLEAR_OFFSET, read comment above CLEAR_OFFSET */ u64 n_sectors; /* size of device, if ATA */ |
