The ncq_sense_buf buffer field of struct ata_port is allocated and used
only for devices that support the Command Duration Limits (CDL) feature.
However, the cdl buffer of struct ata_device, which is used to cache the
command duration limits log page for devices supporting CDL is always
allocated as part of struct ata_device, which is wasteful of memory for
devices that do not support this feature.
Clean this up by defining both buffers as part of the new ata_cdl
structure and allocating this structure only for devices that support
the CDL feature. This new structure is attached to struct ata_device
using the cdl pointer.
The functions ata_dev_init_cdl_resources() and
ata_dev_cleanup_cdl_resources() are defined to manage this new structure
allocation, initialization and cleanup when a port is removed or a
device disabled. ata_dev_init_cdl_resources() is called from
ata_dev_config_cdl() only for devices that support CDL.
ata_dev_cleanup_cdl_resources() is called from ata_port_free() and
ata_eh_dev_disable() to free the ata_cdl structure when a device is
being disabled by EH or its port being removed.
Note that the name of the former cdl log buffer of struct ata_device is
changed to desc_log_buf to make it clearer that it is a buffer for the
limit descriptors log page.
This change reduces the size of struct ata_device, thus reducing memory
usage for ATA devices that do not support the CDL feature.
Signed-off-by: Damien Le Moal <dlemoal@xxxxxxxxxx>
---
drivers/ata/libata-core.c | 73 ++++++++++++++++++++++++++-------------
drivers/ata/libata-eh.c | 2 ++
drivers/ata/libata-sata.c | 2 +-
drivers/ata/libata-scsi.c | 2 +-
drivers/ata/libata.h | 1 +
include/linux/libata.h | 21 ++++++++---
6 files changed, 71 insertions(+), 30 deletions(-)
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 32325a1c07af..afc245b2f7cc 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2464,12 +2464,40 @@ static void ata_dev_config_trusted(struct ata_device *dev)
dev->flags |= ATA_DFLAG_TRUSTED;
}
+static int ata_dev_init_cdl_resources(struct ata_device *dev)
+{
+ struct ata_cdl *cdl = dev->cdl;
+ unsigned int err_mask;
+
+ if (!cdl) {
+ cdl = kzalloc(sizeof(*cdl), GFP_KERNEL);
+ if (!cdl)
+ return -ENOMEM;
+ dev->cdl = cdl;
+ }
+
+ err_mask = ata_read_log_page(dev, ATA_LOG_CDL, 0, cdl->desc_log_buf,
+ ATA_LOG_CDL_SIZE / ATA_SECT_SIZE);
+ if (err_mask) {
+ ata_dev_warn(dev, "Read Command Duration Limits log failed\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+void ata_dev_cleanup_cdl_resources(struct ata_device *dev)
+{
+ kfree(dev->cdl);
+ dev->cdl = NULL;
+}
+
static void ata_dev_config_cdl(struct ata_device *dev)
{
- struct ata_port *ap = dev->link->ap;
unsigned int err_mask;
bool cdl_enabled;
u64 val;
+ int ret;
if (ata_id_major_version(dev->id) < 11)
goto not_supported;
@@ -2564,37 +2592,20 @@ static void ata_dev_config_cdl(struct ata_device *dev)
}
}
- /*
- * Allocate a buffer to handle reading the sense data for successful
- * NCQ Commands log page for commands using a CDL with one of the limit
- * policy set to 0xD (successful completion with sense data available
- * bit set).
- */
- if (!ap->ncq_sense_buf) {
- ap->ncq_sense_buf = kmalloc(ATA_LOG_SENSE_NCQ_SIZE, GFP_KERNEL);
- if (!ap->ncq_sense_buf)
- goto not_supported;
- }
-
- /*
- * Command duration limits is supported: cache the CDL log page 18h
- * (command duration descriptors).
- */
- err_mask = ata_read_log_page(dev, ATA_LOG_CDL, 0, dev->sector_buf, 1);
- if (err_mask) {
- ata_dev_warn(dev, "Read Command Duration Limits log failed\n");
+ /* CDL is supported: allocate and initialize needed resources. */
+ ret = ata_dev_init_cdl_resources(dev);
+ if (ret) {
+ ata_dev_warn(dev, "Initialize CDL resources failed\n");
goto not_supported;
}
- memcpy(dev->cdl, dev->sector_buf, ATA_LOG_CDL_SIZE);
dev->flags |= ATA_DFLAG_CDL;
return;
not_supported:
dev->flags &= ~(ATA_DFLAG_CDL | ATA_DFLAG_CDL_ENABLED);
- kfree(ap->ncq_sense_buf);
- ap->ncq_sense_buf = NULL;
+ ata_dev_cleanup_cdl_resources(dev);
}
static int ata_dev_config_lba(struct ata_device *dev)
@@ -5446,12 +5457,19 @@ EXPORT_SYMBOL_GPL(ata_port_alloc);
void ata_port_free(struct ata_port *ap)
{
+ struct ata_device *dev;
+ struct ata_link *link;
+
if (!ap)
return;
+ ata_for_each_link(link, ap, HOST_FIRST) {
+ ata_for_each_dev(dev, link, ALL)
+ ata_dev_cleanup_cdl_resources(dev);
+ }
+
kfree(ap->pmp_link);
kfree(ap->slave_link);
- kfree(ap->ncq_sense_buf);
ida_free(&ata_ida, ap->print_id);
kfree(ap);
}
@@ -6000,6 +6018,13 @@ static void ata_port_detach(struct ata_port *ap)
ata_port_wait_eh(ap);
mutex_lock(&ap->scsi_scan_mutex);
+
+ /* Cleanup CDL device resources */
+ ata_for_each_link(link, ap, HOST_FIRST) {
+ ata_for_each_dev(dev, link, ALL)
+ ata_dev_cleanup_cdl_resources(dev);
+ }
+
spin_lock_irqsave(ap->lock, flags);
/* Remove scsi devices */
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index ed535e1b4225..41f1bee0b434 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -500,6 +500,8 @@ static void ata_eh_dev_disable(struct ata_device *dev)
ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 | ATA_DNXFER_QUIET);
dev->class++;
+ ata_dev_cleanup_cdl_resources(dev);
+
/* From now till the next successful probe, ering is used to
* track probe failures. Clear accumulated device error info.
*/
diff --git a/drivers/ata/libata-sata.c b/drivers/ata/libata-sata.c
index 498430db86f7..c8b119a06bb2 100644
--- a/drivers/ata/libata-sata.c
+++ b/drivers/ata/libata-sata.c
@@ -1505,7 +1505,7 @@ int ata_eh_get_ncq_success_sense(struct ata_link *link)
{
struct ata_device *dev = link->device;
struct ata_port *ap = dev->link->ap;
- u8 *buf = ap->ncq_sense_buf;
+ u8 *buf = dev->cdl->ncq_sense_log_buf;
struct ata_queued_cmd *qc;
unsigned int err_mask, tag;
u8 *sense, sk = 0, asc = 0, ascq = 0;
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index a3ffce4b218d..7fed924d6561 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -2259,7 +2259,7 @@ static inline u16 ata_xlat_cdl_limit(u8 *buf)
static unsigned int ata_msense_control_spgt2(struct ata_device *dev, u8 *buf,
u8 spg)
{
- u8 *b, *cdl = dev->cdl, *desc;
+ u8 *b, *cdl = dev->cdl->desc_log_buf, *desc;
u32 policy;
int i;
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index 2a9d1bbf2482..0f4c6e26fe50 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -89,6 +89,7 @@ extern int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg);
extern const char *sata_spd_string(unsigned int spd);
extern unsigned int ata_read_log_page(struct ata_device *dev, u8 log,
u8 page, void *buf, unsigned int sectors);
+void ata_dev_cleanup_cdl_resources(struct ata_device *dev);
#define to_ata_port(d) container_of(d, struct ata_port, tdev)
diff --git a/include/linux/libata.h b/include/linux/libata.h
index aac38dcd2230..9b4a6ff03235 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -700,6 +700,21 @@ struct ata_cpr_log {
struct ata_cpr cpr[] __counted_by(nr_cpr);
};
+struct ata_cdl {
+ /*
+ * Buffer to cache the CDL log page 18h (command duration descriptors)
+ * for SCSI-ATA translation.
+ */
+ u8 desc_log_buf[ATA_LOG_CDL_SIZE];
+
+ /*
+ * Buffer to handle reading the sense data for successful NCQ Commands
+ * log page for commands using a CDL with one of the limits policy set
+ * to 0xD (successful completion with sense data available bit set).
+ */
+ u8 ncq_sense_log_buf[ATA_LOG_SENSE_NCQ_SIZE];
+};
+
struct ata_device {
struct ata_link *link;
unsigned int devno; /* 0 or 1 */
@@ -762,8 +777,8 @@ struct ata_device {
/* Concurrent positioning ranges */
struct ata_cpr_log *cpr_log;
- /* Command Duration Limits log support */
- u8 cdl[ATA_LOG_CDL_SIZE];
+ /* Command Duration Limits support */
+ struct ata_cdl *cdl;
/* error history */
int spdn_cnt;
@@ -917,8 +932,6 @@ struct ata_port {
#ifdef CONFIG_ATA_ACPI
struct ata_acpi_gtm __acpi_init_gtm; /* use ata_acpi_init_gtm() */
#endif
- /* owned by EH */
- u8 *ncq_sense_buf;
};
/* The following initializer overrides a method to NULL whether one of
--
2.46.0
