irqchip/gic-v3-its: Add missing changes to support 52bit physical address

The current ITS driver works fine as long as normal memory and GICR
regions are located within the lower 48bit (>=0 && <2^48) physical
address space. Some of the registers GICR_PEND/PROP, GICR_VPEND/VPROP
and GITS_CBASER are handled properly but not all when configuring
the hardware with 52bit physical address.

This patch does the following changes to support 52bit PA.
  -Handle 52bit PA in GITS_BASERn.
  -Fix ITT_addr width to 52bits, bits[51:8].
  -Fix RDbase width to 52bits, bits[51:16].
  -Fix VPT_addr width to 52bits, bits[51:16].

Definition of the GITS_BASERn register when ITS PageSize is 64KB:
  -Bits[47:16] of the register provide bits[47:16] of the table PA.
  -Bits[15:12] of the register provide bits[51:48] of the table PA.
  -Bits[15:00] of the base physical address are 0.

Signed-off-by: Shanker Donthineni <shankerd@codeaurora.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

drivers/irqchip/irq-gic-v3-its.c

@@ -312,7 +312,7 @@ static void its_encode_size(struct its_cmd_block *cmd, u8 size)
 
 static void its_encode_itt(struct its_cmd_block *cmd, u64 itt_addr)
 {
-	its_mask_encode(&cmd->raw_cmd[2], itt_addr >> 8, 50, 8);
+	its_mask_encode(&cmd->raw_cmd[2], itt_addr >> 8, 51, 8);
 }
 
 static void its_encode_valid(struct its_cmd_block *cmd, int valid)
@@ -322,7 +322,7 @@ static void its_encode_valid(struct its_cmd_block *cmd, int valid)
 
 static void its_encode_target(struct its_cmd_block *cmd, u64 target_addr)
 {
-	its_mask_encode(&cmd->raw_cmd[2], target_addr >> 16, 50, 16);
+	its_mask_encode(&cmd->raw_cmd[2], target_addr >> 16, 51, 16);
 }
 
 static void its_encode_collection(struct its_cmd_block *cmd, u16 col)
@@ -362,7 +362,7 @@ static void its_encode_its_list(struct its_cmd_block *cmd, u16 its_list)
 
 static void its_encode_vpt_addr(struct its_cmd_block *cmd, u64 vpt_pa)
 {
-	its_mask_encode(&cmd->raw_cmd[3], vpt_pa >> 16, 50, 16);
+	its_mask_encode(&cmd->raw_cmd[3], vpt_pa >> 16, 51, 16);
 }
 
 static void its_encode_vpt_size(struct its_cmd_block *cmd, u8 vpt_size)
@@ -1482,9 +1482,9 @@ static int its_setup_baser(struct its_node *its, struct its_baser *baser,
 	u64 val = its_read_baser(its, baser);
 	u64 esz = GITS_BASER_ENTRY_SIZE(val);
 	u64 type = GITS_BASER_TYPE(val);
+	u64 baser_phys, tmp;
 	u32 alloc_pages;
 	void *base;
-	u64 tmp;
 
 retry_alloc_baser:
 	alloc_pages = (PAGE_ORDER_TO_SIZE(order) / psz);
@@ -1500,8 +1500,24 @@ retry_alloc_baser:
 	if (!base)
 		return -ENOMEM;
 
+	baser_phys = virt_to_phys(base);
+
+	/* Check if the physical address of the memory is above 48bits */
+	if (IS_ENABLED(CONFIG_ARM64_64K_PAGES) && (baser_phys >> 48)) {
+
+		/* 52bit PA is supported only when PageSize=64K */
+		if (psz != SZ_64K) {
+			pr_err("ITS: no 52bit PA support when psz=%d\n", psz);
+			free_pages((unsigned long)base, order);
+			return -ENXIO;
+		}
+
+		/* Convert 52bit PA to 48bit field */
+		baser_phys = GITS_BASER_PHYS_52_to_48(baser_phys);
+	}
+
 retry_baser:
-	val = (virt_to_phys(base)				 |
+	val = (baser_phys					 |
 		(type << GITS_BASER_TYPE_SHIFT)			 |
 		((esz - 1) << GITS_BASER_ENTRY_SIZE_SHIFT)	 |
 		((alloc_pages - 1) << GITS_BASER_PAGES_SHIFT)	 |

include/linux/irqchip/arm-gic-v3.h

@@ -372,6 +372,8 @@
 #define GITS_BASER_ENTRY_SIZE_SHIFT		(48)
 #define GITS_BASER_ENTRY_SIZE(r)	((((r) >> GITS_BASER_ENTRY_SIZE_SHIFT) & 0x1f) + 1)
 #define GITS_BASER_ENTRY_SIZE_MASK	GENMASK_ULL(52, 48)
+#define GITS_BASER_PHYS_52_to_48(phys)					\
+	(((phys) & GENMASK_ULL(47, 16)) | (((phys) >> 48) & 0xf) << 12)
 #define GITS_BASER_SHAREABILITY_SHIFT	(10)
 #define GITS_BASER_InnerShareable					\
 	GIC_BASER_SHAREABILITY(GITS_BASER, InnerShareable)