Linux Kernel: Uart relay sysfs node.

Bug 2461581

Change-Id: Ia2fd3cc72459a6d18781ae9ea6c2a3973947f2d6
Signed-off-by: Andre Richter <arichter@nvidia.com>
(cherry picked from commit 91064c5aa574fc3e719a643f24079cddb36c53de)
Reviewed-on: https://git-master.nvidia.com/r/2119540
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Hardik T Shah <hardikts@nvidia.com>
Reviewed-by: Phoenix Jung <pjung@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 31 insertions, 1 deletions

diff --git a/include/soc/tegra/virt/syscalls.h b/include/soc/tegra/virt/syscalls.h
index bacef2471..f673b7911 100644
--- a/include/soc/tegra/virt/syscalls.h
+++ b/include/soc/tegra/virt/syscalls.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2014-2017, NVIDIA CORPORATION. All rights reserved.
+ * Copyright (C) 2014-2019, NVIDIA CORPORATION. All rights reserved.
  *
  * Hypervisor interfaces
  *
@@ -46,6 +46,7 @@
 #define HVC_NR_READ_HYP_INFO            9
 #define HVC_NR_GUEST_RESET              10
 #define HVC_NR_SYSINFO_IPA              13
+#define HVC_NR_UART_RELAY_INFO          518
 
 #define GUEST_PRIMARY           0
 #define GUEST_IVC_SERVER        0
@@ -181,6 +182,10 @@ struct hyp_server_page {
 #define _X4_X17 "x4", "x5", "x6", "x7", "x8", "x9", "x10", "x11", "x12", \
 "x13", "x14", "x15", "x16", "x17"
 
+#define _X5_X17 "x5", "x6", "x7", "x8", "x9", "x10", "x11", "x12", \
+"x13", "x14", "x15", "x16", "x17"
+
+
 static inline int hyp_read_gid(unsigned int *gid)
 {
         register uint64_t r0 asm("x0");
@@ -320,6 +325,31 @@ static inline uint64_t hyp_sysinfo_ipa(void)
         return r0;
 }
 
+static inline int hyp_read_uart_relay_info(uint64_t *ipa, uint64_t *size,
+                                        uint64_t *num_channels,
+                                        uint64_t *max_msg_size)
+{
+        register uint64_t x0 asm("x0");
+        register uint64_t x1 asm("x1");
+        register uint64_t x2 asm("x2");
+        register uint64_t x3 asm("x3");
+        register uint64_t x4 asm("x4");
+
+        asm("hvc %5"
+                : "=r"(x0), "=r"(x1),
+                  "=r"(x2), "=r"(x3),
+                  "=r"(x4)
+                : "i"(HVC_NR_UART_RELAY_INFO)
+                : _X5_X17);
+
+        *ipa = x1;
+        *size = x2;
+        *num_channels = x3;
+        *max_msg_size = x4;
+
+        return (int)x0;
+}
+
 #undef _X3_X17
 #undef _X4_X17