[PATCH v3 01/12] x86/platform/intel/iosf_mbi: Add a mutex for P-Unit access

Hans de Goede
2017-02-10T10:27:51Z

One some systems the P-Unit accesses the PMIC to change various voltages
through the same bus as other kernel drivers use for e.g. battery
monitoring.

If a driver sends requests to the P-Unit which require the P-Unit to access
the PMIC bus while another driver is also accessing the PMIC bus various
bad things happen.

This commit adds a mutex to protect the P-Unit against simultaneous
accesses and 2 functions to lock / unlock this mutex.

Note on these systems the i2c-bus driver will request a sempahore from the
P-Unit for exclusive access to the PMIC bus when i2c drivers are accessing
it, but this does not appear to be sufficient, we still need to avoid
making certain P-Unit requests during the access window to avoid problems.

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=155241
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Tested-by: tagorereddy <tagore.chandan@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
Changes in v2:
-Rename iosf_mbi_punit_lock/_unlock to _acquire/_release rename
-Spelling: P-Unit, PMIC
---
arch/x86/include/asm/iosf_mbi.h | 31 +++++++++++++++++++++++++++++++
arch/x86/platform/intel/iosf_mbi.c | 13 +++++++++++++
2 files changed, 44 insertions(+)

diff --git a/arch/x86/include/asm/iosf_mbi.h b/arch/x86/include/asm/iosf_mbi.h
index b41ee16..f6119d0 100644
--- a/arch/x86/include/asm/iosf_mbi.h
+++ b/arch/x86/include/asm/iosf_mbi.h
@@ -88,6 +88,33 @@ int iosf_mbi_write(u8 port, u8 opcode, u32 offset, u32 mdr);
*/
int iosf_mbi_modify(u8 port, u8 opcode, u32 offset, u32 mdr, u32 mask);

+/**
+ * iosf_mbi_punit_acquire() - Acquire access to the P-Unit
+ *
+ * One some systems the P-Unit accesses the PMIC to change various voltages
+ * through the same bus as other kernel drivers use for e.g. battery monitoring.
+ *
+ * If a driver sends requests to the P-Unit which require the P-Unit to access
+ * the PMIC bus while another driver is also accessing the PMIC bus various bad
+ * things happen.
+ *
+ * To avoid these problems this function must be called before accessing the
+ * P-Unit or the PMIC, be it through iosf_mbi* functions or through other means.
+ *
+ * Note on these systems the i2c-bus driver will request a sempahore from the
+ * P-Unit for exclusive access to the PMIC bus when i2c drivers are accessing
+ * it, but this does not appear to be sufficient, we still need to avoid making
+ * certain P-Unit requests during the access window to avoid problems.
+ *
+ * This function locks a mutex, as such it may sleep.
+ */
+void iosf_mbi_punit_acquire(void);
+
+/**
+ * iosf_mbi_punit_release() - Release access to the P-Unit
+ */
+void iosf_mbi_punit_release(void);
+
#else /* CONFIG_IOSF_MBI is not enabled */
static inline
bool iosf_mbi_available(void)
@@ -115,6 +142,10 @@ int iosf_mbi_modify(u8 port, u8 opcode, u32 offset, u32 mdr, u32 mask)
WARN(1, "IOSF_MBI driver not available");
return -EPERM;
}
+
+static inline void iosf_mbi_punit_acquire(void) {}
+static inline void iosf_mbi_punit_release(void) {}
+
#endif /* CONFIG_IOSF_MBI */

#endif /* IOSF_MBI_SYMS_H */
diff --git a/arch/x86/platform/intel/iosf_mbi.c b/arch/x86/platform/intel/iosf_mbi.c
index edf2c54..ed24fa9f 100644
--- a/arch/x86/platform/intel/iosf_mbi.c
+++ b/arch/x86/platform/intel/iosf_mbi.c
@@ -34,6 +34,7 @@

static struct pci_dev *mbi_pdev;
static DEFINE_SPINLOCK(iosf_mbi_lock);
+static DEFINE_MUTEX(iosf_mbi_punit_mutex);

static inline u32 iosf_mbi_form_mcr(u8 op, u8 port, u8 offset)
{
@@ -190,6 +191,18 @@ bool iosf_mbi_available(void)
}
EXPORT_SYMBOL(iosf_mbi_available);

+void iosf_mbi_punit_acquire(void)
+{
+ mutex_lock(&iosf_mbi_punit_mutex);
+}
+EXPORT_SYMBOL(iosf_mbi_punit_acquire);
+
+void iosf_mbi_punit_release(void)
+{
+ mutex_unlock(&iosf_mbi_punit_mutex);
+}
+EXPORT_SYMBOL(iosf_mbi_punit_release);
+
#ifdef CONFIG_IOSF_MBI_DEBUG
static u32 dbg_mdr;
static u32 dbg_mcr;
--
2.9.3

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org