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Subject[PATCH v1 1/4] platform/x86: intel_pmc_ipc: Add read64 API
Date
Add intel_pmc_gcr_read64() API for reading from 64-bit GCR registers.
This API will be called from intel_telemetry. Update description of
intel_pmc_gcr_read().

Signed-off-by: Souvik Kumar Chakravarty <souvik.k.chakravarty@intel.com>
---
arch/x86/include/asm/intel_pmc_ipc.h | 6 ++++++
drivers/platform/x86/intel_pmc_ipc.c | 33 +++++++++++++++++++++++++++++++--
2 files changed, 37 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/intel_pmc_ipc.h b/arch/x86/include/asm/intel_pmc_ipc.h
index fac89eb..19c9369 100644
--- a/arch/x86/include/asm/intel_pmc_ipc.h
+++ b/arch/x86/include/asm/intel_pmc_ipc.h
@@ -37,6 +37,7 @@ int intel_pmc_ipc_command(u32 cmd, u32 sub, u8 *in, u32 inlen,
u32 *out, u32 outlen);
int intel_pmc_s0ix_counter_read(u64 *data);
int intel_pmc_gcr_read(u32 offset, u32 *data);
+int intel_pmc_gcr_read64(u32 offset, u64 *data);
int intel_pmc_gcr_write(u32 offset, u32 data);
int intel_pmc_gcr_update(u32 offset, u32 mask, u32 val);

@@ -69,6 +70,11 @@ static inline int intel_pmc_gcr_read(u32 offset, u32 *data)
return -EINVAL;
}

+static inline int intel_pmc_gcr_read64(u32 offset, u64 *data)
+{
+ return -EINVAL;
+}
+
static inline int intel_pmc_gcr_write(u32 offset, u32 data)
{
return -EINVAL;
diff --git a/drivers/platform/x86/intel_pmc_ipc.c b/drivers/platform/x86/intel_pmc_ipc.c
index e03fa314..e7edc8c 100644
--- a/drivers/platform/x86/intel_pmc_ipc.c
+++ b/drivers/platform/x86/intel_pmc_ipc.c
@@ -215,11 +215,11 @@ static inline int is_gcr_valid(u32 offset)
}

/**
- * intel_pmc_gcr_read() - Read PMC GCR register
+ * intel_pmc_gcr_read() - Read a 32-bit PMC GCR register
* @offset: offset of GCR register from GCR address base
* @data: data pointer for storing the register output
*
- * Reads the PMC GCR register of given offset.
+ * Reads the 32-bit PMC GCR register at given offset.
*
* Return: negative value on error or 0 on success.
*/
@@ -244,6 +244,35 @@ int intel_pmc_gcr_read(u32 offset, u32 *data)
EXPORT_SYMBOL_GPL(intel_pmc_gcr_read);

/**
+ * intel_pmc_gcr_read64() - Read a 64-bit PMC GCR register
+ * @offset: offset of GCR register from GCR address base
+ * @data: data pointer for storing the register output
+ *
+ * Reads the 64-bit PMC GCR register at given offset.
+ *
+ * Return: negative value on error or 0 on success.
+ */
+int intel_pmc_gcr_read64(u32 offset, u64 *data)
+{
+ int ret;
+
+ spin_lock(&ipcdev.gcr_lock);
+
+ ret = is_gcr_valid(offset);
+ if (ret < 0) {
+ spin_unlock(&ipcdev.gcr_lock);
+ return ret;
+ }
+
+ *data = readq(ipcdev.gcr_mem_base + offset);
+
+ spin_unlock(&ipcdev.gcr_lock);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(intel_pmc_gcr_read64);
+
+/**
* intel_pmc_gcr_write() - Write PMC GCR register
* @offset: offset of GCR register from GCR address base
* @data: register update value
--
2.7.4
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