hv:Replace dynamic memory allocation for vuart

Replace dynamic allocation for vuart rx/tx buffer
with static array.

v2-->v3:
 --  Reduce the size of vuart tx buffer from 64K to 8K
 --  For non-partition mode, will use global rx/tx buffer,
     for partition mode, will use per VM rx/tx buffer.
 --  Change several APIs to inline
v1-->v2:
 --  Move vuart rx/tx buffer into acrn_vuart data structure

Tracked-On: #861
Signed-off-by: Mingqiang Chi <mingqiang.chi@intel.com>
Reviewed-by: Li, Fei1 <fei1.li@intel.com>
Reviewed-by: Anthony Xu <anthony.xu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

hypervisor/debug/vuart.c

@@ -34,8 +34,11 @@
 
 #define COM1_BASE		0x3F8U
 #define COM1_IRQ		4U
-#define RX_FIFO_SIZE		256U
+
-#define TX_FIFO_SIZE		65536U
+#ifndef CONFIG_PARTITION_MODE
+static char vuart_rx_buf[RX_BUF_SIZE];
+static char vuart_tx_buf[TX_BUF_SIZE];
+#endif
 
 #define vuart_lock_init(vu)	spinlock_init(&((vu)->lock))
 #define vuart_lock(vu)		spinlock_obtain(&((vu)->lock))
@@ -45,22 +48,14 @@
 int8_t vuart_vmid = - 1;
 #endif
 
-static void fifo_reset(struct fifo *fifo)
+static inline void fifo_reset(struct fifo *fifo)
 {
 	fifo->rindex = 0U;
 	fifo->windex = 0U;
 	fifo->num = 0U;
 }
 
-static void fifo_init(struct fifo *fifo, uint32_t sz)
+static inline void fifo_putchar(struct fifo *fifo, char ch)
-{
-	fifo->buf = calloc(1U, sz);
-	ASSERT(fifo->buf != NULL, "");
-	fifo->size = sz;
-	fifo_reset(fifo);
-}
-
-static void fifo_putchar(struct fifo *fifo, char ch)
 {
 	fifo->buf[fifo->windex] = ch;
 	if (fifo->num < fifo->size) {
@@ -72,7 +67,7 @@ static void fifo_putchar(struct fifo *fifo, char ch)
 	}
 }
 
-static char fifo_getchar(struct fifo *fifo)
+static inline char fifo_getchar(struct fifo *fifo)
 {
 	char c;
 
@@ -86,11 +81,26 @@ static char fifo_getchar(struct fifo *fifo)
 	}
 }
 
-static uint32_t fifo_numchars(struct fifo *fifo)
+static inline uint32_t fifo_numchars(struct fifo *fifo)
 {
 	return fifo->num;
 }
 
+static inline void vuart_fifo_init(struct acrn_vuart *vu)
+{
+#ifdef CONFIG_PARTITION_MODE
+	vu->txfifo.buf = vu->vuart_tx_buf;
+	vu->rxfifo.buf = vu->vuart_rx_buf;
+#else
+	vu->txfifo.buf = vuart_tx_buf;
+	vu->rxfifo.buf = vuart_rx_buf;
+#endif
+	vu->txfifo.size = TX_BUF_SIZE;
+	vu->rxfifo.size = RX_BUF_SIZE;
+	fifo_reset(&(vu->txfifo));
+	fifo_reset(&(vu->rxfifo));
+}
+
 /*
  * The IIR returns a prioritized interrupt reason:
  * - receive data available
@@ -383,8 +393,7 @@ void vuart_init(struct vm *vm)
 	vm->vuart.active = false;
 	vm->vuart.base = COM1_BASE;
 	vm->vuart.vm = vm;
-	fifo_init(&vm->vuart.rxfifo, RX_FIFO_SIZE);
+	vuart_fifo_init(vu);
-	fifo_init(&vm->vuart.txfifo, TX_FIFO_SIZE);
 	vuart_lock_init(vu);
 	vuart_register_io_handler(vm);
 }

hypervisor/include/arch/x86/guest/vm.h

@@ -253,7 +253,7 @@ static inline struct vcpu *get_primary_vcpu(struct vm *vm)
 static inline struct acrn_vuart*
 vm_vuart(struct vm *vm)
 {
-	return (struct acrn_vuart *)&(vm->vuart);
+	return &(vm->vuart);
 }
 
 static inline struct acrn_vpic *

hypervisor/include/debug/vuart.h

@@ -30,6 +30,9 @@
 #ifndef _VUART_H_
 #define	_VUART_H_
 
+#define RX_BUF_SIZE		256U
+#define TX_BUF_SIZE		8192U
+
 struct fifo {
 	char *buf;
 	uint32_t rindex;	/* index to read from */
@@ -53,7 +56,10 @@ struct acrn_vuart {
 	struct fifo rxfifo;
 	struct fifo txfifo;
 	uint16_t base;
-
+#ifdef CONFIG_PARTITION_MODE
+	char vuart_rx_buf[RX_BUF_SIZE];
+	char vuart_tx_buf[TX_BUF_SIZE];
+#endif
 	bool thre_int_pending;	/* THRE interrupt pending */
 	bool active;
 	struct vm *vm;