Patchwork [git,patches] libata fixes

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Submitter Jeff Garzik
Date Jan. 21, 2013, 7:48 p.m.
Message ID <20130121194811.GA30605@havoc.gtf.org>
Download mbox | patch
Permalink /patch/214251/
State Not Applicable
Delegated to: David Miller
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Comments

Jeff Garzik - Jan. 21, 2013, 7:48 p.m.
Please pull 803739d25c2343da6d2f95eebdcbc08bf67097d4 from
git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev.git tags/upstream-linus

to receive the following updates:

 drivers/ata/ahci.c        |  8 +++++++-
 drivers/ata/libahci.c     |  6 +++---
 drivers/ata/libata-core.c | 22 +++++++++++++---------
 drivers/ata/libata-eh.c   |  2 +-
 include/linux/ata.h       |  8 +++++---
 include/linux/libata.h    |  4 ++--
 6 files changed, 31 insertions(+), 19 deletions(-)

Bian Yu (1):
      [libata] ahci: Fix lack of command retry after a success error handler.

Hugh Daschbach (1):
      [libata] ahci: Add support for Enmotus Bobcat device.

Shane Huang (1):
      [libata] replace sata_settings with devslp_timing

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Linus Torvalds - Jan. 22, 2013, 6:04 p.m.
On Mon, Jan 21, 2013 at 11:48 AM, Jeff Garzik <jeff@garzik.org> wrote:
> Please pull 803739d25c2343da6d2f95eebdcbc08bf67097d4 from
> git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev.git tags/upstream-linus

From the tag message:

       " Thought: I wonder if sparse could have caught this, somehow."

You *can* make sparse catch things like that, but you need to
carefully annotate the bits for that to happen.

In particular, you need to make the variable that contains the
bitfield (in this case 'err_mask') and all the values you use for
testing be its own "__bitwise__" type, which is sparse-speak for "this
is not a plain integer, and you cannot do arithmetic on this, you can
only do bitwise things".

So you need to create the specific type with a typedef, something like this:

    typedef unsigned int __bitwise__ err_mask_t;

and then that particular type will now no longer mix with any other
integer types. But that also means that in order to create the bit
definitions that you use to test that type, you have to do something
like this:

  #define AC_ERR_MEDIA ((__force err_mask_t) __AC_ERR_MEDIA)

where the "__force" part allows the cast of a normal integer to the
private type without any errors.

So it's fairly invasive (but usually only in the place where you
define the different bits), and we don't do it very much in the
kernel. The main case we do this for is "gfp_t", because we've had
*soo* many cases of people mixing up the order of arguments to the
memory allocation functions (so size or 'allocation order' has been
switched with the gfp_t argument), and by making it a __bitwise__
type, sparse will warn about it (and will warn about it if you test
the field using the wrong constants).

So see what we do about gfp_t in <linux/types.h> and in <linux/gfp.h>.
It's not *hard*, but the explicit typing does tend to mean that it's
not worth it for most random small things. Whether it is worth it for
the libata mask fields or not, I'll leave up to you.

You can do a "git grep __bitwise__" to see other examples. The SCSI
target code use of sense_reason_t probably comes closest to the libata
case.

                     Linus
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Patch

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 7862d17..4979127 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -53,6 +53,7 @@ 
 
 enum {
 	AHCI_PCI_BAR_STA2X11	= 0,
+	AHCI_PCI_BAR_ENMOTUS	= 2,
 	AHCI_PCI_BAR_STANDARD	= 5,
 };
 
@@ -410,6 +411,9 @@  static const struct pci_device_id ahci_pci_tbl[] = {
 	{ PCI_VDEVICE(ASMEDIA, 0x0611), board_ahci },	/* ASM1061 */
 	{ PCI_VDEVICE(ASMEDIA, 0x0612), board_ahci },	/* ASM1062 */
 
+	/* Enmotus */
+	{ PCI_DEVICE(0x1c44, 0x8000), board_ahci },
+
 	/* Generic, PCI class code for AHCI */
 	{ PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
 	  PCI_CLASS_STORAGE_SATA_AHCI, 0xffffff, board_ahci },
@@ -1098,9 +1102,11 @@  static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 		dev_info(&pdev->dev,
 			 "PDC42819 can only drive SATA devices with this driver\n");
 
-	/* The Connext uses non-standard BAR */
+	/* Both Connext and Enmotus devices use non-standard BARs */
 	if (pdev->vendor == PCI_VENDOR_ID_STMICRO && pdev->device == 0xCC06)
 		ahci_pci_bar = AHCI_PCI_BAR_STA2X11;
+	else if (pdev->vendor == 0x1c44 && pdev->device == 0x8000)
+		ahci_pci_bar = AHCI_PCI_BAR_ENMOTUS;
 
 	/* acquire resources */
 	rc = pcim_enable_device(pdev);
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 320712a..6cd7805 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -1951,13 +1951,13 @@  static void ahci_set_aggressive_devslp(struct ata_port *ap, bool sleep)
 	/* Use the nominal value 10 ms if the read MDAT is zero,
 	 * the nominal value of DETO is 20 ms.
 	 */
-	if (dev->sata_settings[ATA_LOG_DEVSLP_VALID] &
+	if (dev->devslp_timing[ATA_LOG_DEVSLP_VALID] &
 	    ATA_LOG_DEVSLP_VALID_MASK) {
-		mdat = dev->sata_settings[ATA_LOG_DEVSLP_MDAT] &
+		mdat = dev->devslp_timing[ATA_LOG_DEVSLP_MDAT] &
 		       ATA_LOG_DEVSLP_MDAT_MASK;
 		if (!mdat)
 			mdat = 10;
-		deto = dev->sata_settings[ATA_LOG_DEVSLP_DETO];
+		deto = dev->devslp_timing[ATA_LOG_DEVSLP_DETO];
 		if (!deto)
 			deto = 20;
 	} else {
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 9e8b99a..46cd3f4 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2325,24 +2325,28 @@  int ata_dev_configure(struct ata_device *dev)
 			}
 		}
 
-		/* check and mark DevSlp capability */
-		if (ata_id_has_devslp(dev->id))
-			dev->flags |= ATA_DFLAG_DEVSLP;
-
-		/* Obtain SATA Settings page from Identify Device Data Log,
-		 * which contains DevSlp timing variables etc.
-		 * Exclude old devices with ata_id_has_ncq()
+		/* Check and mark DevSlp capability. Get DevSlp timing variables
+		 * from SATA Settings page of Identify Device Data Log.
 		 */
-		if (ata_id_has_ncq(dev->id)) {
+		if (ata_id_has_devslp(dev->id)) {
+			u8 sata_setting[ATA_SECT_SIZE];
+			int i, j;
+
+			dev->flags |= ATA_DFLAG_DEVSLP;
 			err_mask = ata_read_log_page(dev,
 						     ATA_LOG_SATA_ID_DEV_DATA,
 						     ATA_LOG_SATA_SETTINGS,
-						     dev->sata_settings,
+						     sata_setting,
 						     1);
 			if (err_mask)
 				ata_dev_dbg(dev,
 					    "failed to get Identify Device Data, Emask 0x%x\n",
 					    err_mask);
+			else
+				for (i = 0; i < ATA_LOG_DEVSLP_SIZE; i++) {
+					j = ATA_LOG_DEVSLP_OFFSET + i;
+					dev->devslp_timing[i] = sata_setting[j];
+				}
 		}
 
 		dev->cdb_len = 16;
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index bf039b0..bcf4437 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -2094,7 +2094,7 @@  static unsigned int ata_eh_speed_down(struct ata_device *dev,
  */
 static inline int ata_eh_worth_retry(struct ata_queued_cmd *qc)
 {
-	if (qc->flags & AC_ERR_MEDIA)
+	if (qc->err_mask & AC_ERR_MEDIA)
 		return 0;	/* don't retry media errors */
 	if (qc->flags & ATA_QCFLAG_IO)
 		return 1;	/* otherwise retry anything from fs stack */
diff --git a/include/linux/ata.h b/include/linux/ata.h
index 408da95..8f7a3d6 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -297,10 +297,12 @@  enum {
 	ATA_LOG_SATA_NCQ	= 0x10,
 	ATA_LOG_SATA_ID_DEV_DATA  = 0x30,
 	ATA_LOG_SATA_SETTINGS	  = 0x08,
-	ATA_LOG_DEVSLP_MDAT	  = 0x30,
+	ATA_LOG_DEVSLP_OFFSET	  = 0x30,
+	ATA_LOG_DEVSLP_SIZE	  = 0x08,
+	ATA_LOG_DEVSLP_MDAT	  = 0x00,
 	ATA_LOG_DEVSLP_MDAT_MASK  = 0x1F,
-	ATA_LOG_DEVSLP_DETO	  = 0x31,
-	ATA_LOG_DEVSLP_VALID	  = 0x37,
+	ATA_LOG_DEVSLP_DETO	  = 0x01,
+	ATA_LOG_DEVSLP_VALID	  = 0x07,
 	ATA_LOG_DEVSLP_VALID_MASK = 0x80,
 
 	/* READ/WRITE LONG (obsolete) */
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 83ba0ab..649e5f8 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -652,8 +652,8 @@  struct ata_device {
 		u32		gscr[SATA_PMP_GSCR_DWORDS]; /* PMP GSCR block */
 	};
 
-	/* Identify Device Data Log (30h), SATA Settings (page 08h) */
-	u8			sata_settings[ATA_SECT_SIZE];
+	/* DEVSLP Timing Variables from Identify Device Data Log */
+	u8			devslp_timing[ATA_LOG_DEVSLP_SIZE];
 
 	/* error history */
 	int			spdn_cnt;