msm: smem: Add non-locking smem-get function
For SSR use cases, the failed subsystem may have crashed with the remote
spinlock locked. In this case, if smem_get_entry() is called before
SMEM has processed the subsystem restart, then it will cause a deadlock.
Add new function that does not acquire the remote spinlock for the SSR
restart use case.
Change-Id: Ieab390855a5bdf32beb1b11884846afef6dbbf98
Signed-off-by: Eric Holmberg <eholmber@codeaurora.org>
diff --git a/arch/arm/mach-msm/include/mach/msm_smem.h b/arch/arm/mach-msm/include/mach/msm_smem.h
index 57f22cc..78d2b00 100644
--- a/arch/arm/mach-msm/include/mach/msm_smem.h
+++ b/arch/arm/mach-msm/include/mach/msm_smem.h
@@ -144,6 +144,20 @@
void *smem_alloc2(unsigned id, unsigned size_in);
void *smem_get_entry(unsigned id, unsigned *size);
void *smem_find(unsigned id, unsigned size);
+
+/**
+ * smem_get_entry_no_rlock - Get existing item without using remote spinlock
+ *
+ * @id: ID of SMEM item
+ * @size_out: Pointer to size variable for storing the result
+ * @returns: Pointer to SMEM item or NULL if it doesn't exist
+ *
+ * This function does not lock the remote spinlock and should only be used in
+ * failure-recover cases such as retrieving the subsystem failure reason during
+ * subsystem restart.
+ */
+void *smem_get_entry_no_rlock(unsigned id, unsigned *size_out);
+
/**
* smem_virt_to_phys() - Convert SMEM address to physical address.
*
@@ -172,6 +186,10 @@
{
return NULL;
}
+void *smem_get_entry_no_rlock(unsigned id, unsigned *size_out)
+{
+ return NULL;
+}
static inline phys_addr_t smem_virt_to_phys(void *smem_address)
{
return (phys_addr_t) NULL;