ata: libata: Move sector_buf from struct ata_port to struct ata_device

The 512B buffer sector_buf field of struct ata_port is used for scanning
devices as well as during error recovery with ata EH. This buffer is
thus useless if a port does not have a device connected to it.
And also given that commands using this buffer are issued to devices,
and not to ports, move this buffer definition from struct ata_port to
struct ata_device.

This change slightly increases system memory usage for systems using a
port-multiplier as in that case we do not need a per-device buffer for
scanning devices (PMP does not allow parallel scanning) nor for EH (as
when entering EH we are guaranteed that all commands to all devices
connected to the PMP have completed or have been aborted). However,
this change reduces memory usage on systems that have many ports with
only few devices rives connected, which is a much more common use case
than the PMP use case.

Suggested-by: Niklas Cassel <cassel@kernel.org>
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Niklas Cassel <cassel@kernel.org>

1 files changed, 26 insertions, 37 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index b5a051bbb01f..32325a1c07af 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2125,19 +2125,16 @@ retry:
 
 static int ata_log_supported(struct ata_device *dev, u8 log)
 {
-	struct ata_port *ap = dev->link->ap;
-
 	if (dev->quirks & ATA_QUIRK_NO_LOG_DIR)
 		return 0;
 
-	if (ata_read_log_page(dev, ATA_LOG_DIRECTORY, 0, ap->sector_buf, 1))
+	if (ata_read_log_page(dev, ATA_LOG_DIRECTORY, 0, dev->sector_buf, 1))
 		return 0;
-	return get_unaligned_le16(&ap->sector_buf[log * 2]);
+	return get_unaligned_le16(&dev->sector_buf[log * 2]);
 }
 
 static bool ata_identify_page_supported(struct ata_device *dev, u8 page)
 {
-	struct ata_port *ap = dev->link->ap;
 	unsigned int err, i;
 
 	if (dev->quirks & ATA_QUIRK_NO_ID_DEV_LOG)
@@ -2160,13 +2157,13 @@ static bool ata_identify_page_supported(struct ata_device *dev, u8 page)
 	 * Read IDENTIFY DEVICE data log, page 0, to figure out if the page is
 	 * supported.
 	 */
-	err = ata_read_log_page(dev, ATA_LOG_IDENTIFY_DEVICE, 0, ap->sector_buf,
-				1);
+	err = ata_read_log_page(dev, ATA_LOG_IDENTIFY_DEVICE, 0,
+				dev->sector_buf, 1);
 	if (err)
 		return false;
 
-	for (i = 0; i < ap->sector_buf[8]; i++) {
-		if (ap->sector_buf[9 + i] == page)
+	for (i = 0; i < dev->sector_buf[8]; i++) {
+		if (dev->sector_buf[9 + i] == page)
 			return true;
 	}
 
@@ -2218,7 +2215,6 @@ static inline bool ata_dev_knobble(struct ata_device *dev)
 
 static void ata_dev_config_ncq_send_recv(struct ata_device *dev)
 {
-	struct ata_port *ap = dev->link->ap;
 	unsigned int err_mask;
 
 	if (!ata_log_supported(dev, ATA_LOG_NCQ_SEND_RECV)) {
@@ -2226,12 +2222,12 @@ static void ata_dev_config_ncq_send_recv(struct ata_device *dev)
 		return;
 	}
 	err_mask = ata_read_log_page(dev, ATA_LOG_NCQ_SEND_RECV,
-				     0, ap->sector_buf, 1);
+				     0, dev->sector_buf, 1);
 	if (!err_mask) {
 		u8 *cmds = dev->ncq_send_recv_cmds;
 
 		dev->flags |= ATA_DFLAG_NCQ_SEND_RECV;
-		memcpy(cmds, ap->sector_buf, ATA_LOG_NCQ_SEND_RECV_SIZE);
+		memcpy(cmds, dev->sector_buf, ATA_LOG_NCQ_SEND_RECV_SIZE);
 
 		if (dev->quirks & ATA_QUIRK_NO_NCQ_TRIM) {
 			ata_dev_dbg(dev, "disabling queued TRIM support\n");
@@ -2243,7 +2239,6 @@ static void ata_dev_config_ncq_send_recv(struct ata_device *dev)
 
 static void ata_dev_config_ncq_non_data(struct ata_device *dev)
 {
-	struct ata_port *ap = dev->link->ap;
 	unsigned int err_mask;
 
 	if (!ata_log_supported(dev, ATA_LOG_NCQ_NON_DATA)) {
@@ -2252,17 +2247,14 @@ static void ata_dev_config_ncq_non_data(struct ata_device *dev)
 		return;
 	}
 	err_mask = ata_read_log_page(dev, ATA_LOG_NCQ_NON_DATA,
-				     0, ap->sector_buf, 1);
-	if (!err_mask) {
-		u8 *cmds = dev->ncq_non_data_cmds;
-
-		memcpy(cmds, ap->sector_buf, ATA_LOG_NCQ_NON_DATA_SIZE);
-	}
+				     0, dev->sector_buf, 1);
+	if (!err_mask)
+		memcpy(dev->ncq_non_data_cmds, dev->sector_buf,
+		       ATA_LOG_NCQ_NON_DATA_SIZE);
 }
 
 static void ata_dev_config_ncq_prio(struct ata_device *dev)
 {
-	struct ata_port *ap = dev->link->ap;
 	unsigned int err_mask;
 
 	if (!ata_identify_page_supported(dev, ATA_LOG_SATA_SETTINGS))
@@ -2271,12 +2263,11 @@ static void ata_dev_config_ncq_prio(struct ata_device *dev)
 	err_mask = ata_read_log_page(dev,
 				     ATA_LOG_IDENTIFY_DEVICE,
 				     ATA_LOG_SATA_SETTINGS,
-				     ap->sector_buf,
-				     1);
+				     dev->sector_buf, 1);
 	if (err_mask)
 		goto not_supported;
 
-	if (!(ap->sector_buf[ATA_LOG_NCQ_PRIO_OFFSET] & BIT(3)))
+	if (!(dev->sector_buf[ATA_LOG_NCQ_PRIO_OFFSET] & BIT(3)))
 		goto not_supported;
 
 	dev->flags |= ATA_DFLAG_NCQ_PRIO;
@@ -2392,9 +2383,8 @@ static void ata_dev_config_sense_reporting(struct ata_device *dev)
 
 static void ata_dev_config_zac(struct ata_device *dev)
 {
-	struct ata_port *ap = dev->link->ap;
 	unsigned int err_mask;
-	u8 *identify_buf = ap->sector_buf;
+	u8 *identify_buf = dev->sector_buf;
 
 	dev->zac_zones_optimal_open = U32_MAX;
 	dev->zac_zones_optimal_nonseq = U32_MAX;
@@ -2446,7 +2436,6 @@ static void ata_dev_config_zac(struct ata_device *dev)
 
 static void ata_dev_config_trusted(struct ata_device *dev)
 {
-	struct ata_port *ap = dev->link->ap;
 	u64 trusted_cap;
 	unsigned int err;
 
@@ -2460,11 +2449,11 @@ static void ata_dev_config_trusted(struct ata_device *dev)
 	}
 
 	err = ata_read_log_page(dev, ATA_LOG_IDENTIFY_DEVICE, ATA_LOG_SECURITY,
-			ap->sector_buf, 1);
+				dev->sector_buf, 1);
 	if (err)
 		return;
 
-	trusted_cap = get_unaligned_le64(&ap->sector_buf[40]);
+	trusted_cap = get_unaligned_le64(&dev->sector_buf[40]);
 	if (!(trusted_cap & (1ULL << 63))) {
 		ata_dev_dbg(dev,
 			    "Trusted Computing capability qword not valid!\n");
@@ -2492,12 +2481,12 @@ static void ata_dev_config_cdl(struct ata_device *dev)
 
 	err_mask = ata_read_log_page(dev, ATA_LOG_IDENTIFY_DEVICE,
 				     ATA_LOG_SUPPORTED_CAPABILITIES,
-				     ap->sector_buf, 1);
+				     dev->sector_buf, 1);
 	if (err_mask)
 		goto not_supported;
 
 	/* Check Command Duration Limit Supported bits */
-	val = get_unaligned_le64(&ap->sector_buf[168]);
+	val = get_unaligned_le64(&dev->sector_buf[168]);
 	if (!(val & BIT_ULL(63)) || !(val & BIT_ULL(0)))
 		goto not_supported;
 
@@ -2510,7 +2499,7 @@ static void ata_dev_config_cdl(struct ata_device *dev)
 	 * We must have support for the sense data for successful NCQ commands
 	 * log indicated by the successful NCQ command sense data supported bit.
 	 */
-	val = get_unaligned_le64(&ap->sector_buf[8]);
+	val = get_unaligned_le64(&dev->sector_buf[8]);
 	if (!(val & BIT_ULL(63)) || !(val & BIT_ULL(47))) {
 		ata_dev_warn(dev,
 			"CDL supported but Successful NCQ Command Sense Data is not supported\n");
@@ -2530,11 +2519,11 @@ static void ata_dev_config_cdl(struct ata_device *dev)
 	 */
 	err_mask = ata_read_log_page(dev, ATA_LOG_IDENTIFY_DEVICE,
 				     ATA_LOG_CURRENT_SETTINGS,
-				     ap->sector_buf, 1);
+				     dev->sector_buf, 1);
 	if (err_mask)
 		goto not_supported;
 
-	val = get_unaligned_le64(&ap->sector_buf[8]);
+	val = get_unaligned_le64(&dev->sector_buf[8]);
 	cdl_enabled = val & BIT_ULL(63) && val & BIT_ULL(21);
 	if (dev->flags & ATA_DFLAG_CDL_ENABLED) {
 		if (!cdl_enabled) {
@@ -2591,13 +2580,13 @@ static void ata_dev_config_cdl(struct ata_device *dev)
 	 * 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, ap->sector_buf, 1);
+	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");
 		goto not_supported;
 	}
 
-	memcpy(dev->cdl, ap->sector_buf, ATA_LOG_CDL_SIZE);
+	memcpy(dev->cdl, dev->sector_buf, ATA_LOG_CDL_SIZE);
 	dev->flags |= ATA_DFLAG_CDL;
 
 	return;
@@ -2689,7 +2678,7 @@ nofua:
 
 static void ata_dev_config_devslp(struct ata_device *dev)
 {
-	u8 *sata_setting = dev->link->ap->sector_buf;
+	u8 *sata_setting = dev->sector_buf;
 	unsigned int err_mask;
 	int i, j;
 
@@ -3759,7 +3748,7 @@ static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
 int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
 {
 	unsigned int class = dev->class;
-	u16 *id = (void *)dev->link->ap->sector_buf;
+	u16 *id = (void *)dev->sector_buf;
 	int rc;
 
 	/* read ID data */