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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v5 09/13] xen/arm: mm: Use generic variable/function names for extendability
From: Penny Zheng <penny.zheng@xxxxxxx>
As preparation for MPU support, which will use some variables/functions
for both MMU and MPU system, We rename the affected variable/function
to more generic names:
- init_ttbr -> init_mm,
- mmu_init_secondary_cpu() -> mm_init_secondary_cpu()
- init_secondary_pagetables() -> init_secondary_mm()
- Add a wrapper update_mm_mapping() for MMU system's
update_identity_mapping()
Modify the related in-code comment to reflect above changes, take the
opportunity to fix the incorrect coding style of the in-code comments.
Signed-off-by: Penny Zheng <penny.zheng@xxxxxxx>
Signed-off-by: Henry Wang <Henry.Wang@xxxxxxx>
---
v5:
- Rebase on top of xen/arm: mm: add missing extern variable declaration
v4:
- Extract the renaming part from the original patch:
"[v3,13/52] xen/mmu: extract mmu-specific codes from mm.c/mm.h"
---
xen/arch/arm/arm32/head.S | 4 ++--
xen/arch/arm/arm64/mmu/head.S | 2 +-
xen/arch/arm/arm64/mmu/mm.c | 11 ++++++++---
xen/arch/arm/arm64/smpboot.c | 6 +++---
xen/arch/arm/include/asm/arm64/mm.h | 7 ++++---
xen/arch/arm/include/asm/mm.h | 12 +++++++-----
xen/arch/arm/mmu/mm.c | 20 ++++++++++----------
xen/arch/arm/smpboot.c | 4 ++--
8 files changed, 37 insertions(+), 29 deletions(-)
diff --git a/xen/arch/arm/arm32/head.S b/xen/arch/arm/arm32/head.S
index 33b038e7e0..03ab68578a 100644
--- a/xen/arch/arm/arm32/head.S
+++ b/xen/arch/arm/arm32/head.S
@@ -238,11 +238,11 @@ GLOBAL(init_secondary)
secondary_switched:
/*
* Non-boot CPUs need to move on to the proper pagetables, which were
- * setup in init_secondary_pagetables.
+ * setup in init_secondary_mm.
*
* XXX: This is not compliant with the Arm Arm.
*/
- mov_w r4, init_ttbr /* VA of HTTBR value stashed by CPU 0 */
+ mov_w r4, init_mm /* VA of HTTBR value stashed by CPU 0 */
ldrd r4, r5, [r4] /* Actual value */
dsb
mcrr CP64(r4, r5, HTTBR)
diff --git a/xen/arch/arm/arm64/mmu/head.S b/xen/arch/arm/arm64/mmu/head.S
index ba2ddd7e67..58d91c9088 100644
--- a/xen/arch/arm/arm64/mmu/head.S
+++ b/xen/arch/arm/arm64/mmu/head.S
@@ -302,7 +302,7 @@ ENDPROC(enable_mmu)
ENTRY(enable_secondary_cpu_mm)
mov x5, lr
- load_paddr x0, init_ttbr
+ load_paddr x0, init_mm
ldr x0, [x0]
bl enable_mmu
diff --git a/xen/arch/arm/arm64/mmu/mm.c b/xen/arch/arm/arm64/mmu/mm.c
index 78b7c7eb00..ed0fc5ff7b 100644
--- a/xen/arch/arm/arm64/mmu/mm.c
+++ b/xen/arch/arm/arm64/mmu/mm.c
@@ -106,7 +106,7 @@ void __init arch_setup_page_tables(void)
prepare_runtime_identity_mapping();
}
-void update_identity_mapping(bool enable)
+static void update_identity_mapping(bool enable)
{
paddr_t id_addr = virt_to_maddr(_start);
int rc;
@@ -120,6 +120,11 @@ void update_identity_mapping(bool enable)
BUG_ON(rc);
}
+void update_mm_mapping(bool enable)
+{
+ update_identity_mapping(enable);
+}
+
extern void switch_ttbr_id(uint64_t ttbr);
typedef void (switch_ttbr_fn)(uint64_t ttbr);
@@ -131,7 +136,7 @@ void __init switch_ttbr(uint64_t ttbr)
lpae_t pte;
/* Enable the identity mapping in the boot page tables */
- update_identity_mapping(true);
+ update_mm_mapping(true);
/* Enable the identity mapping in the runtime page tables */
pte = pte_of_xenaddr((vaddr_t)switch_ttbr_id);
@@ -148,7 +153,7 @@ void __init switch_ttbr(uint64_t ttbr)
* Note it is not necessary to disable it in the boot page tables
* because they are not going to be used by this CPU anymore.
*/
- update_identity_mapping(false);
+ update_mm_mapping(false);
}
/*
diff --git a/xen/arch/arm/arm64/smpboot.c b/xen/arch/arm/arm64/smpboot.c
index 9637f42469..2b1d086a1e 100644
--- a/xen/arch/arm/arm64/smpboot.c
+++ b/xen/arch/arm/arm64/smpboot.c
@@ -111,18 +111,18 @@ int arch_cpu_up(int cpu)
if ( !smp_enable_ops[cpu].prepare_cpu )
return -ENODEV;
- update_identity_mapping(true);
+ update_mm_mapping(true);
rc = smp_enable_ops[cpu].prepare_cpu(cpu);
if ( rc )
- update_identity_mapping(false);
+ update_mm_mapping(false);
return rc;
}
void arch_cpu_up_finish(void)
{
- update_identity_mapping(false);
+ update_mm_mapping(false);
}
/*
diff --git a/xen/arch/arm/include/asm/arm64/mm.h
b/xen/arch/arm/include/asm/arm64/mm.h
index e0bd23a6ed..7a389c4b21 100644
--- a/xen/arch/arm/include/asm/arm64/mm.h
+++ b/xen/arch/arm/include/asm/arm64/mm.h
@@ -15,13 +15,14 @@ static inline bool arch_mfns_in_directmap(unsigned long
mfn, unsigned long nr)
void arch_setup_page_tables(void);
/*
- * Enable/disable the identity mapping in the live page-tables (i.e.
- * the one pointed by TTBR_EL2).
+ * In MMU system, enable/disable the identity mapping in the live
+ * page-tables (i.e. the one pointed by TTBR_EL2) through
+ * update_identity_mapping().
*
* Note that nested call (e.g. enable=true, enable=true) is not
* supported.
*/
-void update_identity_mapping(bool enable);
+void update_mm_mapping(bool enable);
#endif /* __ARM_ARM64_MM_H__ */
diff --git a/xen/arch/arm/include/asm/mm.h b/xen/arch/arm/include/asm/mm.h
index dc1458b047..8084c62c01 100644
--- a/xen/arch/arm/include/asm/mm.h
+++ b/xen/arch/arm/include/asm/mm.h
@@ -170,7 +170,7 @@ struct page_info
#define PGC_need_scrub PGC_allocated
/* Non-boot CPUs use this to find the correct pagetables. */
-extern uint64_t init_ttbr;
+extern uint64_t init_mm;
#ifdef CONFIG_ARM_32
#define is_xen_heap_page(page) is_xen_heap_mfn(page_to_mfn(page))
@@ -205,11 +205,13 @@ extern void setup_pagetables(unsigned long
boot_phys_offset);
extern void *early_fdt_map(paddr_t fdt_paddr);
/* Remove early mappings */
extern void remove_early_mappings(void);
-/* Allocate and initialise pagetables for a secondary CPU. Sets init_ttbr to
the
- * new page table */
-extern int init_secondary_pagetables(int cpu);
+/*
+ * Allocate and initialise pagetables for a secondary CPU. Sets init_mm to the
+ * new page table
+ */
+extern int init_secondary_mm(int cpu);
/* Switch secondary CPUS to its own pagetables and finalise MMU setup */
-extern void mmu_init_secondary_cpu(void);
+extern void mm_init_secondary_cpu(void);
/* Map a frame table to cover physical addresses ps through pe */
extern void setup_frametable_mappings(paddr_t ps, paddr_t pe);
/* map a physical range in virtual memory */
diff --git a/xen/arch/arm/mmu/mm.c b/xen/arch/arm/mmu/mm.c
index 1d6267e6c5..7486c35ec0 100644
--- a/xen/arch/arm/mmu/mm.c
+++ b/xen/arch/arm/mmu/mm.c
@@ -106,7 +106,7 @@ DEFINE_BOOT_PAGE_TABLE(xen_fixmap);
static DEFINE_PAGE_TABLES(xen_xenmap, XEN_NR_ENTRIES(2));
/* Non-boot CPUs use this to find the correct pagetables. */
-uint64_t init_ttbr;
+uint64_t init_mm;
static paddr_t phys_offset;
@@ -492,18 +492,18 @@ static void clear_boot_pagetables(void)
}
#ifdef CONFIG_ARM_64
-int init_secondary_pagetables(int cpu)
+int init_secondary_mm(int cpu)
{
clear_boot_pagetables();
- /* Set init_ttbr for this CPU coming up. All CPus share a single setof
+ /* Set init_mm for this CPU coming up. All CPus share a single setof
* pagetables, but rewrite it each time for consistency with 32 bit. */
- init_ttbr = (uintptr_t) xen_pgtable + phys_offset;
- clean_dcache(init_ttbr);
+ init_mm = (uintptr_t) xen_pgtable + phys_offset;
+ clean_dcache(init_mm);
return 0;
}
#else
-int init_secondary_pagetables(int cpu)
+int init_secondary_mm(int cpu)
{
lpae_t *first;
@@ -529,16 +529,16 @@ int init_secondary_pagetables(int cpu)
clear_boot_pagetables();
- /* Set init_ttbr for this CPU coming up */
- init_ttbr = __pa(first);
- clean_dcache(init_ttbr);
+ /* Set init_mm for this CPU coming up */
+ init_mm = __pa(first);
+ clean_dcache(init_mm);
return 0;
}
#endif
/* MMU setup for secondary CPUS (which already have paging enabled) */
-void mmu_init_secondary_cpu(void)
+void mm_init_secondary_cpu(void)
{
xen_pt_enforce_wnx();
}
diff --git a/xen/arch/arm/smpboot.c b/xen/arch/arm/smpboot.c
index e107b86b7b..8bcdbea66c 100644
--- a/xen/arch/arm/smpboot.c
+++ b/xen/arch/arm/smpboot.c
@@ -359,7 +359,7 @@ void start_secondary(void)
*/
update_system_features(¤t_cpu_data);
- mmu_init_secondary_cpu();
+ mm_init_secondary_cpu();
gic_init_secondary_cpu();
@@ -448,7 +448,7 @@ int __cpu_up(unsigned int cpu)
printk("Bringing up CPU%d\n", cpu);
- rc = init_secondary_pagetables(cpu);
+ rc = init_secondary_mm(cpu);
if ( rc < 0 )
return rc;
--
2.25.1
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