Re: [PATCH v2 2/2] ata: ahci: Protect users from setting policies their drives don't support

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On 3/3/22 12:49, Mario Limonciello wrote:
As the default low power policy applies to more chipsets and drives, it's
important to make sure that drives actually support the policy that a user
selected in their kernel configuration.

If the drive doesn't support slumber, don't let the default policies
dependent upon slumber (`min_power` or `min_power_with_partial`) affect the
disk.

Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>

Mario,

Can you resend a rebased version of this, on top of libata for-5.19 branch ?

---
Changes from v1->v2:
* Move deeper into codepaths
* Reset to MED_POWER rather than ignore
  drivers/ata/libata-sata.c | 11 +++++++++++
  1 file changed, 11 insertions(+)

diff --git a/drivers/ata/libata-sata.c b/drivers/ata/libata-sata.c
index 071158c0c44c..0dc03888c62b 100644
--- a/drivers/ata/libata-sata.c
+++ b/drivers/ata/libata-sata.c
@@ -13,6 +13,7 @@
  #include <scsi/scsi_device.h>
  #include <linux/libata.h>
+#include "ahci.h"
  #include "libata.h"
  #include "libata-transport.h"
@@ -368,10 +369,20 @@ int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
  		      bool spm_wakeup)
  {
  	struct ata_eh_context *ehc = &link->eh_context;
+	struct ata_port *ap = link->ap;
+	struct ahci_host_priv *hpriv;
  	bool woken_up = false;
  	u32 scontrol;
  	int rc;
+ hpriv = ap->host->private_data;
+	if (policy >= ATA_LPM_MIN_POWER_WITH_PARTIAL &&
+	  !(hpriv->cap & HOST_CAP_SSC)) {
+		dev_warn(ap->host->dev,
+			"This drive doesn't support slumber; restting policy to MED_POWER\n");

Typo here: s/restting/resetting. Also, s/doesn't/does not.

+		policy = ATA_LPM_MED_POWER;

Here, shouldn't we use the default policy defined by CONFIG_SATA_LPM_POLICY ?

+	}
+
  	rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
  	if (rc)
  		return rc;


--
Damien Le Moal
Western Digital Research



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