From: Ingo Molnar <mingo@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
Andy Lutomirski <luto@amacapital.net>,
Borislav Petkov <bp@alien8.de>, "H . Peter Anvin" <hpa@zytor.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Yinghai Lu <yinghai@kernel.org>
Subject: [PATCH 27/50] x86/boot/e820: Rename early_reserve_e820() to e820__memblock_alloc() and document it
Date: Sat, 28 Jan 2017 23:11:48 +0100 [thread overview]
Message-ID: <1485641531-22124-28-git-send-email-mingo@kernel.org> (raw)
In-Reply-To: <1485641531-22124-1-git-send-email-mingo@kernel.org>
early_reserve_e820() is an early hack for kexec that does a limited fixup of the
mptable and passes it to the kexec kernel as if it was the real thing.
For this it needs to allocate memory - but no memory allocator is available yet
beyond the memblock allocator, so early_reserve_e820() is really a wrapper
around memblock_alloc() plus a hack to update the e820_table_firmware entries.
The name 'reserve' is really a bit of a misnomer, as 'reserved' memory typically
means memory completely inaccessible to the kernel - while here what we want to do
is a special RAM allocation for our own purposes and insert that as RAM_RESERVED.
Rename the function to e820__memblock_alloc_reserved() to better signal this dual
purpose, plus document it better, which was omitted when it was merged. The barely
comprehensible and cryptic comment:
/*
* pre allocated 4k and reserved it in memblock and e820_table_firmware
*/
u64 __init e820__memblock_alloc_reserved(u64 size, u64 align)
... does not count as documentation, replace it with:
/*
* Allocate the requested number of bytes with the requsted alignment
* and return (the physical address) to the caller. Also register this
* range in the 'firmware' E820 table.
*
* This allows kexec to fake a new mptable, as if it came from the real
* system.
*/
u64 __init e820__memblock_alloc_reserved(u64 size, u64 align)
No change in functionality.
Cc: Alex Thorlton <athorlton@sgi.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Huang, Ying <ying.huang@intel.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul Jackson <pj@sgi.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/include/asm/e820/api.h | 2 +-
arch/x86/include/asm/mpspec.h | 4 ++--
arch/x86/kernel/e820.c | 11 ++++++++---
arch/x86/kernel/mpparse.c | 4 ++--
arch/x86/kernel/setup.c | 2 +-
5 files changed, 14 insertions(+), 9 deletions(-)
diff --git a/arch/x86/include/asm/e820/api.h b/arch/x86/include/asm/e820/api.h
index 0162581b0cae..3fdc0612d762 100644
--- a/arch/x86/include/asm/e820/api.h
+++ b/arch/x86/include/asm/e820/api.h
@@ -20,7 +20,7 @@ extern void e820_setup_gap(void);
extern void e820__memory_setup_extended(u64 phys_addr, u32 data_len);
extern unsigned long e820_end_of_ram_pfn(void);
extern unsigned long e820_end_of_low_ram_pfn(void);
-extern u64 early_reserve_e820(u64 sizet, u64 align);
+extern u64 e820__memblock_alloc_reserved(u64 sizet, u64 align);
extern void e820__memblock_setup(void);
extern void e820_reserve_setup_data(void);
extern void e820__finish_early_params(void);
diff --git a/arch/x86/include/asm/mpspec.h b/arch/x86/include/asm/mpspec.h
index 32007041ef8c..831eb7895535 100644
--- a/arch/x86/include/asm/mpspec.h
+++ b/arch/x86/include/asm/mpspec.h
@@ -64,7 +64,7 @@ static inline void find_smp_config(void)
}
#ifdef CONFIG_X86_MPPARSE
-extern void early_reserve_e820_mpc_new(void);
+extern void e820__memblock_alloc_reserved_mpc_new(void);
extern int enable_update_mptable;
extern int default_mpc_apic_id(struct mpc_cpu *m);
extern void default_smp_read_mpc_oem(struct mpc_table *mpc);
@@ -76,7 +76,7 @@ extern void default_mpc_oem_bus_info(struct mpc_bus *m, char *str);
extern void default_find_smp_config(void);
extern void default_get_smp_config(unsigned int early);
#else
-static inline void early_reserve_e820_mpc_new(void) { }
+static inline void e820__memblock_alloc_reserved_mpc_new(void) { }
#define enable_update_mptable 0
#define default_mpc_apic_id NULL
#define default_smp_read_mpc_oem NULL
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 904ddb1343f2..93b5e3e5a3f0 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -734,16 +734,21 @@ core_initcall(e820_mark_nvs_memory);
#endif
/*
- * pre allocated 4k and reserved it in memblock and e820_table_firmware
+ * Allocate the requested number of bytes with the requsted alignment
+ * and return (the physical address) to the caller. Also register this
+ * range in the 'firmware' E820 table as a reserved range.
+ *
+ * This allows kexec to fake a new mptable, as if it came from the real
+ * system.
*/
-u64 __init early_reserve_e820(u64 size, u64 align)
+u64 __init e820__memblock_alloc_reserved(u64 size, u64 align)
{
u64 addr;
addr = __memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
if (addr) {
e820_update_range_firmware(addr, size, E820_RAM, E820_RESERVED);
- pr_info("e820: update e820_table_firmware for early_reserve_e820\n");
+ pr_info("e820: update e820_table_firmware for e820__memblock_alloc_reserved()\n");
update_e820_table_firmware();
}
diff --git a/arch/x86/kernel/mpparse.c b/arch/x86/kernel/mpparse.c
index 1e3320788510..0d904d759ff1 100644
--- a/arch/x86/kernel/mpparse.c
+++ b/arch/x86/kernel/mpparse.c
@@ -826,10 +826,10 @@ static int __init parse_alloc_mptable_opt(char *p)
}
early_param("alloc_mptable", parse_alloc_mptable_opt);
-void __init early_reserve_e820_mpc_new(void)
+void __init e820__memblock_alloc_reserved_mpc_new(void)
{
if (enable_update_mptable && alloc_mptable)
- mpc_new_phys = early_reserve_e820(mpc_new_length, 4);
+ mpc_new_phys = e820__memblock_alloc_reserved(mpc_new_length, 4);
}
static int __init update_mp_table(void)
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index a121e01d8a4d..a31c5bc99635 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1112,7 +1112,7 @@ void __init setup_arch(char **cmdline_p)
}
/* preallocate 4k for mptable mpc */
- early_reserve_e820_mpc_new();
+ e820__memblock_alloc_reserved_mpc_new();
#ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
setup_bios_corruption_check();
--
2.7.4
next prev parent reply other threads:[~2017-01-28 22:45 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-28 22:11 [PATCH 00/50] x86: Clean up and reorganize the E820 table handling code Ingo Molnar
2017-01-28 22:11 ` [PATCH 01/50] x86/boot/e820: Introduce arch/x86/include/asm/e820/types.h Ingo Molnar
2017-01-29 17:13 ` Sam Ravnborg
2017-01-30 7:58 ` Ingo Molnar
2017-01-31 5:41 ` Sam Ravnborg
2017-01-31 16:35 ` Ingo Molnar
2017-01-31 17:22 ` Sam Ravnborg
2017-01-31 18:00 ` Ingo Molnar
2017-01-31 18:04 ` Joe Perches
2017-01-31 19:17 ` Sam Ravnborg
2017-02-01 8:56 ` Ingo Molnar
2017-01-28 22:11 ` [PATCH 02/50] x86/boot/e820: Clean up and improve comments in asm/e820/types.h Ingo Molnar
2017-01-28 22:11 ` [PATCH 03/50] x86/boot/e820: Move asm/e820.h to asm/e820/api.h Ingo Molnar
2017-01-28 22:11 ` [PATCH 04/50] x86/boot/e820: Split minimal UAPI types out into uapi/asm/e820/types.h Ingo Molnar
2017-01-28 22:11 ` [PATCH 05/50] x86/boot/e820: Clean up the E820_X_MAX definition Ingo Molnar
2017-01-28 22:11 ` [PATCH 06/50] x86/boot/e820: Remove spurious asm/e820/api.h inclusions Ingo Molnar
2017-01-28 22:11 ` [PATCH 07/50] x86/boot/e820: Remove assembly guard from asm/e820/types.h Ingo Molnar
2017-01-28 22:11 ` [PATCH 08/50] x86/boot/e820: Clean up asm/e820/api.h Ingo Molnar
2017-01-28 22:11 ` [PATCH 09/50] x86/boot/e820: Remove unnecessary __ASSEMBLY__ guard Ingo Molnar
2017-01-28 22:11 ` [PATCH 10/50] x86/boot/e820: Move HIGH_MEMORY define to asm/e820/types.h Ingo Molnar
2017-01-28 22:11 ` [PATCH 11/50] x86/boot/e820: Rename the basic e820 data types to 'struct e820_entry' and 'struct e820_array' Ingo Molnar
2017-01-28 22:11 ` [PATCH 12/50] x86/boot/e820: Remove unnecessary #include <linux/ioport.h> from asm/e820/api.h Ingo Molnar
2017-01-28 22:11 ` [PATCH 13/50] x86/boot/e820: Remove e820_mark_nosave_regions() definition uglies Ingo Molnar
2017-01-28 22:11 ` [PATCH 14/50] x86/boot/e820: Rename 'e820_map' variables to 'e820_array' Ingo Molnar
2017-01-28 22:11 ` [PATCH 15/50] x86/boot/e820: Rename everything to e820_table Ingo Molnar
2017-01-28 22:11 ` [PATCH 16/50] x86/boot/e820: Harmonize the 'struct e820_table' fields Ingo Molnar
2017-01-28 22:11 ` [PATCH 17/50] x86/boot/e820: Rename default_machine_specific_memory_setup() to e820__memory_setup_default() Ingo Molnar
2017-01-28 22:11 ` [PATCH 18/50] x86/boot/e820: Rename e820_table_saved to e820_table_firmware and improve the description Ingo Molnar
2017-01-28 22:11 ` [PATCH 19/50] x86/boot/e820: Basic cleanup of e820.c Ingo Molnar
2017-01-28 22:11 ` [PATCH 20/50] x86/boot/e820: Rename memblock_x86_fill() to e820__memblock_setup() and improve the explanations Ingo Molnar
2017-01-28 22:11 ` [PATCH 21/50] x86/boot/e820: Consolidate 'struct e820_entry *entry' local variable names Ingo Molnar
2017-01-28 22:11 ` [PATCH 22/50] x86/boot/e820: Convert printk(KERN_* ...) to pr_*() Ingo Molnar
2017-01-28 22:59 ` Joe Perches
2017-01-28 22:11 ` [PATCH 23/50] x86/boot/e820: Move the memblock_find_dma_reserve() function and rename it to memblock_set_dma_reserve() Ingo Molnar
2017-01-28 22:11 ` [PATCH 24/50] x86/boot/e820: Rename parse_e820_ext() to e820__memory_setup_extended() Ingo Molnar
2017-01-28 22:11 ` [PATCH 25/50] x86/boot/e820: Move e820_reserve_setup_data() to e820.c Ingo Molnar
2017-01-28 22:11 ` [PATCH 26/50] x86/boot/e820: Clarify the role of finish_e820_parsing() and rename it to e820__finish_early_params() Ingo Molnar
2017-01-28 22:11 ` Ingo Molnar [this message]
2017-01-28 22:11 ` [PATCH 28/50] x86/boot/e820: Rename update_e820() to e820__update_table() Ingo Molnar
2017-01-28 22:11 ` [PATCH 29/50] x86/boot/e820: Rename sanitize_e820_table() " Ingo Molnar
2017-01-28 22:11 ` [PATCH 30/50] x86/boot/e820: Rename e820_any_mapped()/e820_all_mapped() to e820__mapped_any()/e820__mapped_all() Ingo Molnar
2017-01-28 22:11 ` [PATCH 31/50] x86/boot/e820: Rename e820_setup_gap() to e820__setup_pci_gap() Ingo Molnar
2017-01-28 22:11 ` [PATCH 32/50] x86/boot/e820: Create coherent API function names for E820 range operations Ingo Molnar
2017-01-28 22:11 ` [PATCH 33/50] x86/boot/e820: Rename e820_print_map() to e820__print_table() Ingo Molnar
2017-01-28 22:11 ` [PATCH 34/50] x86/boot/e820: Reorder the function prototypes in api.h Ingo Molnar
2017-01-28 22:11 ` [PATCH 35/50] x86/boot/e820: Simplify e820_reserve_resources() Ingo Molnar
2017-01-28 22:11 ` [PATCH 36/50] x86/boot/e820: Introduce 'enum e820_type' Ingo Molnar
2017-01-28 22:11 ` [PATCH 37/50] x86/boot/e820: Use 'enum e820_type' in 'struct e820_entry' Ingo Molnar
2017-01-28 23:07 ` Linus Torvalds
2017-01-29 9:19 ` Ingo Molnar
2017-01-29 12:38 ` [PATCH] x86/boot/e820: Separate the E820 ABI structures from the in-kernel structures Ingo Molnar
2017-01-29 18:53 ` [PATCH 37/50] x86/boot/e820: Use 'enum e820_type' in 'struct e820_entry' Linus Torvalds
2017-01-28 22:11 ` [PATCH 38/50] x86/boot/e820: Use 'enum e820_type' when handling the e820 region type Ingo Molnar
2017-01-28 22:12 ` [PATCH 39/50] x86/boot/e820: Prefix the E820_* type names with "E820_TYPE_" Ingo Molnar
2017-01-28 22:12 ` [PATCH 40/50] x86/boot/e820: Clean up the E820 table size define names Ingo Molnar
2017-01-28 22:12 ` [PATCH 41/50] x86/boot/e820: Clean up and standardize sizeof() uses Ingo Molnar
2017-01-28 22:12 ` [PATCH 42/50] xen, x86/boot/e820: Simplify Xen's xen_e820_table construct Ingo Molnar
2017-01-28 22:12 ` [PATCH 43/50] x86/boot/e820: Simplify the e820__update_table() interface Ingo Molnar
2017-01-28 22:12 ` [PATCH 44/50] x86/boot/e820: Clean up __e820__update_table() et al Ingo Molnar
2017-01-28 22:12 ` [PATCH 45/50] x86/boot/e820: Document e820__reserve_setup_data() Ingo Molnar
2017-01-28 22:12 ` [PATCH 46/50] x86/boot/e820: Use bool in query APIs Ingo Molnar
2017-01-28 22:12 ` [PATCH 47/50] x86/boot/e820: Rename e820_reserve_resources*() to e820__reserve_resources*() Ingo Molnar
2017-01-28 22:12 ` [PATCH 48/50] x86/boot/e820: Rename e820_mark_nosave_regions() to e820__register_nosave_regions() Ingo Molnar
2017-01-28 22:12 ` [PATCH 49/50] x86/boot/e820: Remove unnecessary #include's Ingo Molnar
2017-01-28 22:12 ` [PATCH 50/50] x86/boot/e820: Rename the remaining E820 APIs to the e820__*() prefix Ingo Molnar
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