Merge tag 'loongarch-fixes-6.1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson

torvalds · torvalds · commit 7f043b7662b6 · 2022-12-08T11:16:15.000-08:00
Pull LoongArch fixes from Huacai Chen:
 "Export smp_send_reschedule() for modules use, fix a huge page entry
  update issue, and add documents for booting description"

* tag 'loongarch-fixes-6.1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson:
  docs/zh_CN: Add LoongArch booting description's translation
  docs/LoongArch: Add booting description
  LoongArch: mm: Fix huge page entry update for virtual machine
  LoongArch: Export symbol for function smp_send_reschedule()
diff --git a/Documentation/loongarch/booting.rst b/Documentation/loongarch/booting.rst
@@ -0,0 +1,42 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=======================
+Booting Linux/LoongArch
+=======================
+
+:Author: Yanteng Si <siyanteng@loongson.cn>
+:Date:   18 Nov 2022
+
+Information passed from BootLoader to kernel
+============================================
+
+LoongArch supports ACPI and FDT. The information that needs to be passed
+to the kernel includes the memmap, the initrd, the command line, optionally
+the ACPI/FDT tables, and so on.
+
+The kernel is passed the following arguments on `kernel_entry` :
+
+      - a0 = efi_boot: `efi_boot` is a flag indicating whether
+        this boot environment is fully UEFI-compliant.
+
+      - a1 = cmdline: `cmdline` is a pointer to the kernel command line.
+
+      - a2 = systemtable: `systemtable` points to the EFI system table.
+        All pointers involved at this stage are in physical addresses.
+
+Header of Linux/LoongArch kernel images
+=======================================
+
+Linux/LoongArch kernel images are EFI images. Being PE files, they have
+a 64-byte header structured like::
+
+	u32	MZ_MAGIC                /* "MZ", MS-DOS header */
+	u32	res0 = 0                /* Reserved */
+	u64	kernel_entry            /* Kernel entry point */
+	u64	_end - _text            /* Kernel image effective size */
+	u64	load_offset             /* Kernel image load offset from start of RAM */
+	u64	res1 = 0                /* Reserved */
+	u64	res2 = 0                /* Reserved */
+	u64	res3 = 0                /* Reserved */
+	u32	LINUX_PE_MAGIC          /* Magic number */
+	u32	pe_header - _head       /* Offset to the PE header */
diff --git a/Documentation/loongarch/index.rst b/Documentation/loongarch/index.rst
@@ -9,6 +9,7 @@ LoongArch Architecture
    :numbered:
 
    introduction
+   booting
    irq-chip-model
 
    features
diff --git a/Documentation/translations/zh_CN/loongarch/booting.rst b/Documentation/translations/zh_CN/loongarch/booting.rst
@@ -0,0 +1,48 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+.. include:: ../disclaimer-zh_CN.rst
+
+:Original: Documentation/loongarch/booting.rst
+
+:翻译:
+
+ 司延腾 Yanteng Si <siyanteng@loongson.cn>
+
+====================
+启动 Linux/LoongArch
+====================
+
+:作者: 司延腾 <siyanteng@loongson.cn>
+:日期: 2022年11月18日
+
+BootLoader传递给内核的信息
+==========================
+
+LoongArch支持ACPI和FDT启动，需要传递给内核的信息包括memmap、initrd、cmdline、可
+选的ACPI/FDT表等。
+
+内核在 `kernel_entry` 入口处被传递以下参数:
+
+      - a0 = efi_boot: `efi_boot` 是一个标志，表示这个启动环境是否完全符合UEFI
+        的要求。
+
+      - a1 = cmdline: `cmdline` 是一个指向内核命令行的指针。
+
+      - a2 = systemtable: `systemtable` 指向EFI的系统表，在这个阶段涉及的所有
+        指针都是物理地址。
+
+Linux/LoongArch内核镜像文件头
+=============================
+
+内核镜像是EFI镜像。作为PE文件，它们有一个64字节的头部结构体，如下所示::
+
+	u32	MZ_MAGIC                /* "MZ", MS-DOS 头 */
+	u32	res0 = 0                /* 保留 */
+	u64	kernel_entry            /* 内核入口点 */
+	u64	_end - _text            /* 内核镜像有效大小 */
+	u64	load_offset             /* 加载内核镜像相对内存起始地址的偏移量 */
+	u64	res1 = 0                /* 保留 */
+	u64	res2 = 0                /* 保留 */
+	u64	res3 = 0                /* 保留 */
+	u32	LINUX_PE_MAGIC          /* 魔术数 */
+	u32	pe_header - _head       /* 到PE头的偏移量 */
diff --git a/Documentation/translations/zh_CN/loongarch/index.rst b/Documentation/translations/zh_CN/loongarch/index.rst
@@ -14,6 +14,7 @@ LoongArch体系结构
    :numbered:
 
    introduction
+   booting
    irq-chip-model
 
    features
diff --git a/arch/loongarch/include/asm/smp.h b/arch/loongarch/include/asm/smp.h
@@ -78,16 +78,6 @@ extern void calculate_cpu_foreign_map(void);
  */
 extern void show_ipi_list(struct seq_file *p, int prec);
 
-/*
- * This function sends a 'reschedule' IPI to another CPU.
- * it goes straight through and wastes no time serializing
- * anything. Worst case is that we lose a reschedule ...
- */
-static inline void smp_send_reschedule(int cpu)
-{
-	loongson_send_ipi_single(cpu, SMP_RESCHEDULE);
-}
-
 static inline void arch_send_call_function_single_ipi(int cpu)
 {
 	loongson_send_ipi_single(cpu, SMP_CALL_FUNCTION);
diff --git a/arch/loongarch/kernel/smp.c b/arch/loongarch/kernel/smp.c
@@ -149,6 +149,17 @@ void loongson_send_ipi_mask(const struct cpumask *mask, unsigned int action)
 		ipi_write_action(cpu_logical_map(i), (u32)action);
 }
 
+/*
+ * This function sends a 'reschedule' IPI to another CPU.
+ * it goes straight through and wastes no time serializing
+ * anything. Worst case is that we lose a reschedule ...
+ */
+void smp_send_reschedule(int cpu)
+{
+	loongson_send_ipi_single(cpu, SMP_RESCHEDULE);
+}
+EXPORT_SYMBOL_GPL(smp_send_reschedule);
+
 irqreturn_t loongson_ipi_interrupt(int irq, void *dev)
 {
 	unsigned int action;
diff --git a/arch/loongarch/mm/tlbex.S b/arch/loongarch/mm/tlbex.S
@@ -10,6 +10,8 @@
 #include <asm/regdef.h>
 #include <asm/stackframe.h>
 
+#define INVTLB_ADDR_GFALSE_AND_ASID	5
+
 #define PTRS_PER_PGD_BITS	(PAGE_SHIFT - 3)
 #define PTRS_PER_PUD_BITS	(PAGE_SHIFT - 3)
 #define PTRS_PER_PMD_BITS	(PAGE_SHIFT - 3)
@@ -136,13 +138,10 @@ tlb_huge_update_load:
 	ori		t0, ra, _PAGE_VALID
 	st.d		t0, t1, 0
 #endif
-	tlbsrch
-	addu16i.d	t1, zero, -(CSR_TLBIDX_EHINV >> 16)
-	addi.d		ra, t1, 0
-	csrxchg		ra, t1, LOONGARCH_CSR_TLBIDX
-	tlbwr
-
-	csrxchg		zero, t1, LOONGARCH_CSR_TLBIDX
+	csrrd		ra, LOONGARCH_CSR_ASID
+	csrrd		t1, LOONGARCH_CSR_BADV
+	andi		ra, ra, CSR_ASID_ASID
+	invtlb		INVTLB_ADDR_GFALSE_AND_ASID, ra, t1
 
 	/*
 	 * A huge PTE describes an area the size of the
@@ -287,13 +286,11 @@ tlb_huge_update_store:
 	ori		t0, ra, (_PAGE_VALID | _PAGE_DIRTY | _PAGE_MODIFIED)
 	st.d		t0, t1, 0
 #endif
-	tlbsrch
-	addu16i.d	t1, zero, -(CSR_TLBIDX_EHINV >> 16)
-	addi.d		ra, t1, 0
-	csrxchg		ra, t1, LOONGARCH_CSR_TLBIDX
-	tlbwr
+	csrrd		ra, LOONGARCH_CSR_ASID
+	csrrd		t1, LOONGARCH_CSR_BADV
+	andi		ra, ra, CSR_ASID_ASID
+	invtlb		INVTLB_ADDR_GFALSE_AND_ASID, ra, t1
 
-	csrxchg		zero, t1, LOONGARCH_CSR_TLBIDX
 	/*
 	 * A huge PTE describes an area the size of the
 	 * configured huge page size. This is twice the
@@ -436,6 +433,11 @@ tlb_huge_update_modify:
 	ori		t0, ra, (_PAGE_VALID | _PAGE_DIRTY | _PAGE_MODIFIED)
 	st.d		t0, t1, 0
 #endif
+	csrrd		ra, LOONGARCH_CSR_ASID
+	csrrd		t1, LOONGARCH_CSR_BADV
+	andi		ra, ra, CSR_ASID_ASID
+	invtlb		INVTLB_ADDR_GFALSE_AND_ASID, ra, t1
+
 	/*
 	 * A huge PTE describes an area the size of the
 	 * configured huge page size. This is twice the
@@ -466,7 +468,7 @@ tlb_huge_update_modify:
 	addu16i.d	t1, zero, (PS_HUGE_SIZE << (CSR_TLBIDX_PS_SHIFT - 16))
 	csrxchg		t1, t0, LOONGARCH_CSR_TLBIDX
 
-	tlbwr
+	tlbfill
 
 	/* Reset default page size */
 	addu16i.d	t0, zero, (CSR_TLBIDX_PS >> 16)
