linux-kernel - [RFC PATCH 06/12] riscv: Prepare ptdump for vm layout dynamic addresses

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Message-Id: <20210104195840.1593-7-alex@ghiti.fr>
Date:   Mon,  4 Jan 2021 14:58:34 -0500
From:   Alexandre Ghiti <alex@...ti.fr>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Zong Li <zong.li@...ive.com>, Anup Patel <anup@...infault.org>,
        Christoph Hellwig <hch@....de>,
        Ard Biesheuvel <ardb@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, linux-efi@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     Alexandre Ghiti <alex@...ti.fr>
Subject: [RFC PATCH 06/12] riscv: Prepare ptdump for vm layout dynamic addresses

This is a preparatory patch for sv48 support that will introduce
dynamic PAGE_OFFSET.

Dynamic PAGE_OFFSET implies that all zones (vmalloc, vmemmap, fixaddr...)
whose addresses depend on PAGE_OFFSET become dynamic and can't be used
to statically initialize the array used by ptdump to identify the
different zones of the vm layout.

Signed-off-by: Alexandre Ghiti <alex@...ti.fr>
Reviewed-by: Anup Patel <anup@...infault.org>
---
 arch/riscv/mm/ptdump.c | 56 ++++++++++++++++++++++++++++++++++--------
 1 file changed, 46 insertions(+), 10 deletions(-)

diff --git a/arch/riscv/mm/ptdump.c b/arch/riscv/mm/ptdump.c
index ace74dec7492..1be2ca81f8ad 100644
--- a/arch/riscv/mm/ptdump.c
+++ b/arch/riscv/mm/ptdump.c
@@ -58,29 +58,50 @@ struct ptd_mm_info {
 	unsigned long end;
 };
 
+enum address_markers_idx {
+#ifdef CONFIG_KASAN
+	KASAN_SHADOW_START_NR,
+	KASAN_SHADOW_END_NR,
+#endif
+	FIXMAP_START_NR,
+	FIXMAP_END_NR,
+	PCI_IO_START_NR,
+	PCI_IO_END_NR,
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+	VMEMMAP_START_NR,
+	VMEMMAP_END_NR,
+#endif
+	VMALLOC_START_NR,
+	VMALLOC_END_NR,
+	PAGE_OFFSET_NR,
+    KERNEL_MAPPING_NR,
+	END_OF_SPACE_NR
+};
+
 static struct addr_marker address_markers[] = {
 #ifdef CONFIG_KASAN
 	{KASAN_SHADOW_START,	"Kasan shadow start"},
 	{KASAN_SHADOW_END,	"Kasan shadow end"},
 #endif
-	{FIXADDR_START,		"Fixmap start"},
-	{FIXADDR_TOP,		"Fixmap end"},
-	{PCI_IO_START,		"PCI I/O start"},
-	{PCI_IO_END,		"PCI I/O end"},
+	{0,			"Fixmap start"},
+	{0,			"Fixmap end"},
+	{0,			"PCI I/O start"},
+	{0,			"PCI I/O end"},
 #ifdef CONFIG_SPARSEMEM_VMEMMAP
-	{VMEMMAP_START,		"vmemmap start"},
-	{VMEMMAP_END,		"vmemmap end"},
+	{0,			"vmemmap start"},
+	{0,			"vmemmap end"},
 #endif
-	{VMALLOC_START,		"vmalloc() area"},
-	{VMALLOC_END,		"vmalloc() end"},
-	{PAGE_OFFSET,		"Linear mapping"},
+	{0,			"vmalloc() area"},
+	{0,			"vmalloc() end"},
+	{0,			"Linear mapping"},
+	{0,			"Kernel mapping (kernel, BPF, modules)"},
 	{-1, NULL},
 };
 
 static struct ptd_mm_info kernel_ptd_info = {
 	.mm		= &init_mm,
 	.markers	= address_markers,
-	.base_addr	= KERN_VIRT_START,
+	.base_addr	= 0,
 	.end		= ULONG_MAX,
 };
 
@@ -335,6 +356,21 @@ static int ptdump_init(void)
 {
 	unsigned int i, j;
 
+	address_markers[FIXMAP_START_NR].start_address = FIXADDR_START;
+	address_markers[FIXMAP_END_NR].start_address = FIXADDR_TOP;
+	address_markers[PCI_IO_START_NR].start_address = PCI_IO_START;
+	address_markers[PCI_IO_END_NR].start_address = PCI_IO_END;
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+	address_markers[VMEMMAP_START_NR].start_address = VMEMMAP_START;
+	address_markers[VMEMMAP_END_NR].start_address = VMEMMAP_END;
+#endif
+	address_markers[VMALLOC_START_NR].start_address = VMALLOC_START;
+	address_markers[VMALLOC_END_NR].start_address = VMALLOC_END;
+	address_markers[PAGE_OFFSET_NR].start_address = PAGE_OFFSET;
+	address_markers[KERNEL_MAPPING_NR].start_address = KERNEL_LINK_ADDR;
+
+	kernel_ptd_info.base_addr = KERN_VIRT_START;
+
 	for (i = 0; i < ARRAY_SIZE(pg_level); i++)
 		for (j = 0; j < ARRAY_SIZE(pte_bits); j++)
 			pg_level[i].mask |= pte_bits[j].mask;
-- 
2.20.1