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Subject[PATCH] pci: More PRI/PASID cleanup
Date
More consistency cleanups.  Drop the _OFF, separate and indent
CTRL/CAP/STATUS bit definitions, fix that PASID_CAP doesn't
actually report the ENABLE bit.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---

Joerg, I can't test this, so you may want to make sure I'm not
breaking your API. The March 31, 2011 version of the PASID ECN
shows bit 0 of the PASID capability register as reserved, not
an indicator of support for or status of the enable bit.
Presumably the entire capability wouldn't be included if it
can't be enabled. With the below, pci_enable_pasid() now checks
the right bit, but also pci_pasid_features() no longer masks in
bit 0, but being reserved, it should have been clear anyway.
Thanks,

Alex

drivers/pci/ats.c | 70 +++++++++++++++++++++++-----------------------
include/linux/pci_regs.h | 30 +++++++++++---------
2 files changed, 51 insertions(+), 49 deletions(-)

diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c
index 831e192..cc9e8b5 100644
--- a/drivers/pci/ats.c
+++ b/drivers/pci/ats.c
@@ -178,17 +178,18 @@ int pci_enable_pri(struct pci_dev *pdev, u32 reqs)
if (!pos)
return -EINVAL;

- pci_read_config_word(pdev, pos + PCI_PRI_CONTROL_OFF, &control);
- pci_read_config_word(pdev, pos + PCI_PRI_STATUS_OFF, &status);
- if ((control & PCI_PRI_ENABLE) || !(status & PCI_PRI_STATUS_STOPPED))
+ pci_read_config_word(pdev, pos + PCI_PRI_CTRL, &control);
+ pci_read_config_word(pdev, pos + PCI_PRI_STATUS, &status);
+ if ((control & PCI_PRI_CTRL_ENABLE) ||
+ !(status & PCI_PRI_STATUS_STOPPED))
return -EBUSY;

- pci_read_config_dword(pdev, pos + PCI_PRI_MAX_REQ_OFF, &max_requests);
+ pci_read_config_dword(pdev, pos + PCI_PRI_MAX_REQ, &max_requests);
reqs = min(max_requests, reqs);
- pci_write_config_dword(pdev, pos + PCI_PRI_ALLOC_REQ_OFF, reqs);
+ pci_write_config_dword(pdev, pos + PCI_PRI_ALLOC_REQ, reqs);

- control |= PCI_PRI_ENABLE;
- pci_write_config_word(pdev, pos + PCI_PRI_CONTROL_OFF, control);
+ control |= PCI_PRI_CTRL_ENABLE;
+ pci_write_config_word(pdev, pos + PCI_PRI_CTRL, control);

return 0;
}
@@ -209,9 +210,9 @@ void pci_disable_pri(struct pci_dev *pdev)
if (!pos)
return;

- pci_read_config_word(pdev, pos + PCI_PRI_CONTROL_OFF, &control);
- control &= ~PCI_PRI_ENABLE;
- pci_write_config_word(pdev, pos + PCI_PRI_CONTROL_OFF, control);
+ pci_read_config_word(pdev, pos + PCI_PRI_CTRL, &control);
+ control &= ~PCI_PRI_CTRL_ENABLE;
+ pci_write_config_word(pdev, pos + PCI_PRI_CTRL, control);
}
EXPORT_SYMBOL_GPL(pci_disable_pri);

@@ -230,9 +231,9 @@ bool pci_pri_enabled(struct pci_dev *pdev)
if (!pos)
return false;

- pci_read_config_word(pdev, pos + PCI_PRI_CONTROL_OFF, &control);
+ pci_read_config_word(pdev, pos + PCI_PRI_CTRL, &control);

- return (control & PCI_PRI_ENABLE) ? true : false;
+ return (control & PCI_PRI_CTRL_ENABLE) ? true : false;
}
EXPORT_SYMBOL_GPL(pci_pri_enabled);

@@ -252,13 +253,13 @@ int pci_reset_pri(struct pci_dev *pdev)
if (!pos)
return -EINVAL;

- pci_read_config_word(pdev, pos + PCI_PRI_CONTROL_OFF, &control);
- if (control & PCI_PRI_ENABLE)
+ pci_read_config_word(pdev, pos + PCI_PRI_CTRL, &control);
+ if (control & PCI_PRI_CTRL_ENABLE)
return -EBUSY;

- control |= PCI_PRI_RESET;
+ control |= PCI_PRI_CTRL_RESET;

- pci_write_config_word(pdev, pos + PCI_PRI_CONTROL_OFF, control);
+ pci_write_config_word(pdev, pos + PCI_PRI_CTRL, control);

return 0;
}
@@ -285,10 +286,10 @@ bool pci_pri_stopped(struct pci_dev *pdev)
if (!pos)
return true;

- pci_read_config_word(pdev, pos + PCI_PRI_CONTROL_OFF, &control);
- pci_read_config_word(pdev, pos + PCI_PRI_STATUS_OFF, &status);
+ pci_read_config_word(pdev, pos + PCI_PRI_CTRL, &control);
+ pci_read_config_word(pdev, pos + PCI_PRI_STATUS, &status);

- if (control & PCI_PRI_ENABLE)
+ if (control & PCI_PRI_CTRL_ENABLE)
return false;

return (status & PCI_PRI_STATUS_STOPPED) ? true : false;
@@ -314,11 +315,11 @@ int pci_pri_status(struct pci_dev *pdev)
if (!pos)
return -EINVAL;

- pci_read_config_word(pdev, pos + PCI_PRI_CONTROL_OFF, &control);
- pci_read_config_word(pdev, pos + PCI_PRI_STATUS_OFF, &status);
+ pci_read_config_word(pdev, pos + PCI_PRI_CTRL, &control);
+ pci_read_config_word(pdev, pos + PCI_PRI_STATUS, &status);

/* Stopped bit is undefined when enable == 1, so clear it */
- if (control & PCI_PRI_ENABLE)
+ if (control & PCI_PRI_CTRL_ENABLE)
status &= ~PCI_PRI_STATUS_STOPPED;

return status;
@@ -345,21 +346,21 @@ int pci_enable_pasid(struct pci_dev *pdev, int features)
if (!pos)
return -EINVAL;

- pci_read_config_word(pdev, pos + PCI_PASID_CONTROL_OFF, &control);
- pci_read_config_word(pdev, pos + PCI_PASID_CAP_OFF, &supported);
+ pci_read_config_word(pdev, pos + PCI_PASID_CTRL, &control);
+ pci_read_config_word(pdev, pos + PCI_PASID_CAP, &supported);

- if (!(supported & PCI_PASID_ENABLE))
+ if (!(control & PCI_PASID_CTRL_ENABLE))
return -EINVAL;

- supported &= PCI_PASID_EXEC | PCI_PASID_PRIV;
+ supported &= PCI_PASID_CAP_EXEC | PCI_PASID_CAP_PRIV;

/* User wants to enable anything unsupported? */
if ((supported & features) != features)
return -EINVAL;

- control = PCI_PASID_ENABLE | features;
+ control = PCI_PASID_CTRL_ENABLE | features;

- pci_write_config_word(pdev, pos + PCI_PASID_CONTROL_OFF, control);
+ pci_write_config_word(pdev, pos + PCI_PASID_CTRL, control);

return 0;
}
@@ -379,7 +380,7 @@ void pci_disable_pasid(struct pci_dev *pdev)
if (!pos)
return;

- pci_write_config_word(pdev, pos + PCI_PASID_CONTROL_OFF, control);
+ pci_write_config_word(pdev, pos + PCI_PASID_CTRL, control);
}
EXPORT_SYMBOL_GPL(pci_disable_pasid);

@@ -390,9 +391,8 @@ EXPORT_SYMBOL_GPL(pci_disable_pasid);
* Returns a negative value when no PASI capability is present.
* Otherwise is returns a bitmask with supported features. Current
* features reported are:
- * PCI_PASID_ENABLE - PASID capability can be enabled
- * PCI_PASID_EXEC - Execute permission supported
- * PCI_PASID_PRIV - Priviledged mode supported
+ * PCI_PASID_CAP_EXEC - Execute permission supported
+ * PCI_PASID_CAP_PRIV - Priviledged mode supported
*/
int pci_pasid_features(struct pci_dev *pdev)
{
@@ -403,9 +403,9 @@ int pci_pasid_features(struct pci_dev *pdev)
if (!pos)
return -EINVAL;

- pci_read_config_word(pdev, pos + PCI_PASID_CAP_OFF, &supported);
+ pci_read_config_word(pdev, pos + PCI_PASID_CAP, &supported);

- supported &= PCI_PASID_ENABLE | PCI_PASID_EXEC | PCI_PASID_PRIV;
+ supported &= PCI_PASID_CAP_EXEC | PCI_PASID_CAP_PRIV;

return supported;
}
@@ -429,7 +429,7 @@ int pci_max_pasids(struct pci_dev *pdev)
if (!pos)
return -EINVAL;

- pci_read_config_word(pdev, pos + PCI_PASID_CAP_OFF, &supported);
+ pci_read_config_word(pdev, pos + PCI_PASID_CAP, &supported);

supported = (supported & PASID_NUMBER_MASK) >> PASID_NUMBER_SHIFT;

diff --git a/include/linux/pci_regs.h b/include/linux/pci_regs.h
index 090d3a9..4dc97f6 100644
--- a/include/linux/pci_regs.h
+++ b/include/linux/pci_regs.h
@@ -666,22 +666,24 @@
#define PCI_ATS_MIN_STU 12 /* shift of minimum STU block */

/* Page Request Interface */
-#define PCI_PRI_CONTROL_OFF 0x04 /* Offset of control register */
-#define PCI_PRI_STATUS_OFF 0x06 /* Offset of status register */
-#define PCI_PRI_ENABLE 0x0001 /* Enable mask */
-#define PCI_PRI_RESET 0x0002 /* Reset bit mask */
-#define PCI_PRI_STATUS_RF 0x0001 /* Request Failure */
-#define PCI_PRI_STATUS_UPRGI 0x0002 /* Unexpected PRG index */
-#define PCI_PRI_STATUS_STOPPED 0x0100 /* PRI Stopped */
-#define PCI_PRI_MAX_REQ_OFF 0x08 /* Cap offset for max reqs supported */
-#define PCI_PRI_ALLOC_REQ_OFF 0x0c /* Cap offset for max reqs allowed */
+#define PCI_PRI_CTRL 0x04 /* Offset of control register */
+#define PCI_PRI_CTRL_ENABLE 0x01 /* Enabled */
+#define PCI_PRI_CTRL_RESET 0x02 /* Reset */
+#define PCI_PRI_STATUS 0x06 /* Offset of status register */
+#define PCI_PRI_STATUS_RF 0x001 /* Response Failure */
+#define PCI_PRI_STATUS_UPRGI 0x002 /* Unexpected PRG index */
+#define PCI_PRI_STATUS_STOPPED 0x100 /* PRI Stopped */
+#define PCI_PRI_MAX_REQ 0x08 /* Cap offset for max reqs supported */
+#define PCI_PRI_ALLOC_REQ 0x0c /* Cap offset for max reqs allowed */

/* PASID capability */
-#define PCI_PASID_CAP_OFF 0x04 /* PASID feature register */
-#define PCI_PASID_CONTROL_OFF 0x06 /* PASID control register */
-#define PCI_PASID_ENABLE 0x01 /* Enable/Supported bit */
-#define PCI_PASID_EXEC 0x02 /* Exec permissions Enable/Supported */
-#define PCI_PASID_PRIV 0x04 /* Priviledge Mode Enable/Support */
+#define PCI_PASID_CAP 0x04 /* PASID feature register */
+#define PCI_PASID_CAP_EXEC 0x02 /* Exec permissions Supported */
+#define PCI_PASID_CAP_PRIV 0x04 /* Priviledge Mode Supported */
+#define PCI_PASID_CTRL 0x06 /* PASID control register */
+#define PCI_PASID_CTRL_ENABLE 0x01 /* Enable bit */
+#define PCI_PASID_CTRL_EXEC 0x02 /* Exec permissions Enable */
+#define PCI_PASID_CTRL_PRIV 0x04 /* Priviledge Mode Enable */

/* Single Root I/O Virtualization */
#define PCI_SRIOV_CAP 0x04 /* SR-IOV Capabilities */


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