lib: utils/irqchip: Add shared MMIO region for PLIC in root domain

On platforms with Smepmp, the MMIO regions accessed by M-mode need
to be explicitly marked with M-mode only read/write or shared (both
(M-mode and S-mode) read/write permission.

If the above is not done then runtime PLIC access from M-mode on
platforms with Smepmp will result in access fault when further
results in CPU hotplug not working.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>

include/sbi_utils/irqchip/plic.h

@@ -14,6 +14,7 @@
 
 struct plic_data {
 	unsigned long addr;
+	unsigned long size;
 	unsigned long num_src;
 };
 

lib/utils/fdt/fdt_helper.c

@@ -880,6 +880,7 @@ int fdt_parse_plic_node(void *fdt, int nodeoffset, struct plic_data *plic)
 	if (rc < 0 || !reg_addr || !reg_size)
 		return SBI_ENODEV;
 	plic->addr = reg_addr;
+	plic->size = reg_size;
 
 	val = fdt_getprop(fdt, nodeoffset, "riscv,ndev", &len);
 	if (len > 0)

lib/utils/irqchip/plic.c

@@ -10,7 +10,9 @@
 
 #include <sbi/riscv_io.h>
 #include <sbi/riscv_encoding.h>
+#include <sbi/sbi_bitops.h>
 #include <sbi/sbi_console.h>
+#include <sbi/sbi_domain.h>
 #include <sbi/sbi_error.h>
 #include <sbi/sbi_string.h>
 #include <sbi_utils/irqchip/plic.h>
@@ -171,5 +173,7 @@ int plic_cold_irqchip_init(const struct plic_data *plic)
 	for (i = 1; i <= plic->num_src; i++)
 		plic_set_priority(plic, i, 0);
 
-	return 0;
+	return sbi_domain_root_add_memrange(plic->addr, plic->size, BIT(20),
+					(SBI_DOMAIN_MEMREGION_MMIO |
+					 SBI_DOMAIN_MEMREGION_SHARED_SURW_MRW));
 }

platform/fpga/ariane/platform.c

@@ -25,6 +25,8 @@
 #define ARIANE_UART_REG_WIDTH			4
 #define ARIANE_UART_REG_OFFSET			0
 #define ARIANE_PLIC_ADDR			0xc000000
+#define ARIANE_PLIC_SIZE			(0x200000 + \
+						 (ARIANE_HART_COUNT * 0x1000))
 #define ARIANE_PLIC_NUM_SOURCES			3
 #define ARIANE_HART_COUNT			1
 #define ARIANE_CLINT_ADDR			0x2000000
@@ -36,6 +38,7 @@
 
 static struct plic_data plic = {
 	.addr = ARIANE_PLIC_ADDR,
+	.size = ARIANE_PLIC_SIZE,
 	.num_src = ARIANE_PLIC_NUM_SOURCES,
 };
 

platform/fpga/openpiton/platform.c

@@ -24,6 +24,8 @@
 #define OPENPITON_DEFAULT_UART_REG_WIDTH	1
 #define OPENPITON_DEFAULT_UART_REG_OFFSET	0
 #define OPENPITON_DEFAULT_PLIC_ADDR		0xfff1100000
+#define OPENPITON_DEFAULT_PLIC_SIZE		(0x200000 + \
+				(OPENPITON_DEFAULT_HART_COUNT * 0x1000))
 #define OPENPITON_DEFAULT_PLIC_NUM_SOURCES	2
 #define OPENPITON_DEFAULT_HART_COUNT		3
 #define OPENPITON_DEFAULT_CLINT_ADDR		0xfff1020000
@@ -40,6 +42,7 @@ static struct platform_uart_data uart = {
 };
 static struct plic_data plic = {
 	.addr = OPENPITON_DEFAULT_PLIC_ADDR,
+	.size = OPENPITON_DEFAULT_PLIC_SIZE,
 	.num_src = OPENPITON_DEFAULT_PLIC_NUM_SOURCES,
 };
 

platform/kendryte/k210/platform.c

@@ -32,6 +32,7 @@ unsigned long fw_platform_init(unsigned long arg0, unsigned long arg1,
 
 static struct plic_data plic = {
 	.addr = K210_PLIC_BASE_ADDR,
+	.size = K210_PLIC_BASE_SIZE,
 	.num_src = K210_PLIC_NUM_SOURCES,
 };
 

platform/kendryte/k210/platform.h

@@ -27,6 +27,7 @@
 #define K210_ACLINT_MTIMER_ADDR \
 		(K210_CLINT_BASE_ADDR + CLINT_MTIMER_OFFSET)
 #define K210_PLIC_BASE_ADDR	0x0C000000ULL
+#define K210_PLIC_BASE_SIZE	(0x200000ULL + (K210_HART_COUNT * 0x1000))
 
 /* Registers */
 #define K210_PLL0		0x08

platform/nuclei/ux600/platform.c

@@ -39,6 +39,8 @@
 					 CLINT_MTIMER_OFFSET)
 
 #define UX600_PLIC_ADDR			0x8000000
+#define UX600_PLIC_SIZE			(0x200000 + \
+					 (UX600_HART_COUNT * 0x1000))
 #define UX600_PLIC_NUM_SOURCES		0x35
 #define UX600_PLIC_NUM_PRIORITIES	7
 
@@ -63,6 +65,7 @@ static u32 ux600_clk_freq = 8000000;
 
 static struct plic_data plic = {
 	.addr = UX600_PLIC_ADDR,
+	.size = UX600_PLIC_SIZE,
 	.num_src = UX600_PLIC_NUM_SOURCES,
 };
 

platform/template/platform.c

@@ -19,6 +19,8 @@
 #include <sbi_utils/timer/aclint_mtimer.h>
 
 #define PLATFORM_PLIC_ADDR		0xc000000
+#define PLATFORM_PLIC_SIZE		(0x200000 + \
+					 (PLATFORM_HART_COUNT * 0x1000))
 #define PLATFORM_PLIC_NUM_SOURCES	128
 #define PLATFORM_HART_COUNT		4
 #define PLATFORM_CLINT_ADDR		0x2000000
@@ -33,6 +35,7 @@
 
 static struct plic_data plic = {
 	.addr = PLATFORM_PLIC_ADDR,
+	.size = PLATFORM_PLIC_SIZE,
 	.num_src = PLATFORM_PLIC_NUM_SOURCES,
 };