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From: Hari Bathini <hbathini@linux.ibm.com>
To: linuxppc-dev <linuxppc-dev@ozlabs.org>
Cc: Ananth N Mavinakayanahalli <ananth@linux.ibm.com>,
	Mahesh J Salgaonkar <mahesh@linux.ibm.com>,
	Vasant Hegde <hegdevasant@linux.ibm.com>,
	Oliver <oohall@gmail.com>, Nicholas Piggin <npiggin@gmail.com>,
	Daniel Axtens <dja@axtens.net>
Subject: [PATCH v6 24/36] powerpc/fadump: make use of memblock's bottom up allocation mode
Date: Wed, 11 Sep 2019 20:24:28 +0530
Message-ID: <156821364211.5656.14336025460336135194.stgit@hbathini.in.ibm.com> (raw)
In-Reply-To: <156821308145.5656.2233728784001623843.stgit@hbathini.in.ibm.com>

Earlier, memblock_find_in_range() was not used to find the memory to
be reserved for FADump as bottom up allocation mode was not supported.
But since commit 79442ed189acb8b ("mm/memblock.c: introduce bottom-up
allocation mode") bottom up allocation mode is supported for memblock.
So, use it to find the memory to be reserved for FADump.

Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
---

Changes in v6:
  * Avoid hacky code and use memblock_find_in_range with bottom up
    allocation mode supported now.


 arch/powerpc/kernel/fadump.c |   26 ++++++++++++--------------
 1 file changed, 12 insertions(+), 14 deletions(-)

diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
index 852ac47..da75140 100644
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c
@@ -342,7 +342,8 @@ static void __init fadump_reserve_crash_area(unsigned long base,
 
 int __init fadump_reserve_mem(void)
 {
-	u64 base, size, mem_boundary;
+	bool is_memblock_bottom_up = memblock_bottom_up();
+	u64 base, size, mem_boundary, align = PAGE_SIZE;
 	int ret = 1;
 
 	if (!fw_dump.fadump_enabled)
@@ -362,10 +363,11 @@ int __init fadump_reserve_mem(void)
 		fw_dump.boot_memory_size =
 			PAGE_ALIGN(fadump_calculate_reserve_size());
 #ifdef CONFIG_CMA
-		if (!fw_dump.nocma)
+		if (!fw_dump.nocma) {
+			align = FADUMP_CMA_ALIGNMENT;
 			fw_dump.boot_memory_size =
-				ALIGN(fw_dump.boot_memory_size,
-							FADUMP_CMA_ALIGNMENT);
+				ALIGN(fw_dump.boot_memory_size, align);
+		}
 #endif
 	}
 
@@ -419,19 +421,15 @@ int __init fadump_reserve_mem(void)
 	} else {
 		/*
 		 * Reserve memory at an offset closer to bottom of the RAM to
-		 * minimize the impact of memory hot-remove operation. We can't
-		 * use memblock_find_in_range() here since it doesn't allocate
-		 * from bottom to top.
+		 * minimize the impact of memory hot-remove operation.
 		 */
-		while (base <= (mem_boundary - size)) {
-			if (memblock_is_region_memory(base, size) &&
-			    !memblock_is_region_reserved(base, size))
-				break;
+		memblock_set_bottom_up(true);
+		base = memblock_find_in_range(base, mem_boundary, size, align);
 
-			base += size;
-		}
+		/* Restore the previous allocation mode */
+		memblock_set_bottom_up(is_memblock_bottom_up);
 
-		if (base > (mem_boundary - size)) {
+		if (!base) {
 			pr_err("Failed to find memory chunk for reservation!\n");
 			goto error_out;
 		}


  parent reply index

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-11 14:45 [PATCH v6 00/36] Add FADump support on PowerNV platform Hari Bathini
2019-09-11 14:46 ` [PATCH v6 01/36] powerpc/fadump: move internal macros/definitions to a new header Hari Bathini
2019-09-19 10:25   ` Michael Ellerman
2019-09-11 14:46 ` [PATCH v6 02/36] powerpc/fadump: add helper functions Hari Bathini
2019-09-11 14:46 ` [PATCH v6 03/36] powerpc/fadump: declare helper functions in internal header file Hari Bathini
2019-09-11 14:47 ` [PATCH v6 04/36] powerpc/fadump: Improve fadump documentation Hari Bathini
2019-09-11 14:47 ` [PATCH v6 05/36] powerpc/fadump: use helper functions to reserve/release cpu notes buffer Hari Bathini
2019-09-11 14:48 ` [PATCH v6 06/36] pseries/fadump: move rtas specific definitions to platform code Hari Bathini
2019-09-11 14:48 ` [PATCH v6 07/36] pseries/fadump: introduce callbacks for platform specific operations Hari Bathini
2019-09-11 14:48 ` [PATCH v6 08/36] pseries/fadump: define RTAS register/un-register callback functions Hari Bathini
2019-09-11 14:49 ` [PATCH v6 09/36] pseries/fadump: add source info while displaying region contents Hari Bathini
2019-09-11 14:49 ` [PATCH v6 10/36] powerpc/fadump: release all the memory above boot memory size Hari Bathini
2019-09-11 14:49 ` [PATCH v6 11/36] pseries/fadump: move out platform specific support from generic code Hari Bathini
2019-09-11 14:49 ` [PATCH v6 12/36] powerpc/fadump: use FADump instead of fadump for how it is pronounced Hari Bathini
2019-09-11 14:50 ` [PATCH v6 13/36] opal: add MPIPL interface definitions Hari Bathini
2019-09-11 14:50 ` [PATCH v6 14/36] powernv/fadump: add fadump support on powernv Hari Bathini
2019-09-11 14:50 ` [PATCH v6 15/36] powerpc/fadump: improve fadump_reserve_mem() Hari Bathini
2019-09-11 14:50 ` [PATCH v6 16/36] powernv/fadump: register kernel metadata address with opal Hari Bathini
2019-09-11 14:51 ` [PATCH v6 17/36] powernv/fadump: reset metadata address during clean up Hari Bathini
2019-09-11 14:51 ` [PATCH v6 18/36] powernv/fadump: define OPAL register/un-register callback functions Hari Bathini
2019-09-11 14:51 ` [PATCH v6 19/36] powernv/fadump: support copying multiple kernel boot memory regions Hari Bathini
2019-09-11 14:51 ` [PATCH v6 20/36] powernv/fadump: process the crashdump by exporting it as /proc/vmcore Hari Bathini
2019-09-11 14:52 ` [PATCH v6 21/36] powernv/fadump: Warn before processing partial crashdump Hari Bathini
2019-09-11 14:53 ` [PATCH v6 22/36] powernv/fadump: handle invalidation of crashdump and re-registraion Hari Bathini
2019-09-11 14:53 ` [PATCH v6 23/36] powerpc/fadump: Update documentation about OPAL platform support Hari Bathini
2019-09-11 14:54 ` Hari Bathini [this message]
2019-09-11 14:54 ` [PATCH v6 25/36] powernv/fadump: process architected register state data provided by firmware Hari Bathini
2019-09-11 14:55 ` [PATCH v6 26/36] powerpc/fadump: make crash memory ranges array allocation generic Hari Bathini
2019-09-11 14:55 ` [PATCH v6 27/36] powerpc/fadump: consider reserved ranges while releasing memory Hari Bathini
2019-09-11 14:55 ` [PATCH v6 28/36] powerpc/fadump: improve how crashed kernel's memory is reserved Hari Bathini
2019-09-11 14:56 ` [PATCH v6 29/36] powernv/fadump: add support to preserve crash data on FADUMP disabled kernel Hari Bathini
2019-09-11 14:56 ` [PATCH v6 30/36] powerpc/fadump: update documentation about CONFIG_PRESERVE_FA_DUMP Hari Bathini
2019-09-11 14:56 ` [PATCH v6 31/36] powernv/opalcore: export /sys/firmware/opal/core for analysing opal crashes Hari Bathini
2019-09-11 14:56 ` [PATCH v6 32/36] powernv/opalcore: provide an option to invalidate /sys/firmware/opal/core file Hari Bathini
2019-09-11 14:56 ` [PATCH v6 33/36] powerpc/fadump: consider f/w load area Hari Bathini
2019-09-11 14:57 ` [PATCH v6 34/36] powernv/fadump: update documentation about option to release opalcore Hari Bathini
2019-09-11 14:57 ` [PATCH v6 35/36] powerpc/fadump: remove RMA_START and RMA_END macros Hari Bathini
2019-09-11 14:57 ` [PATCH v6 36/36] powernv/fadump: support holes in kernel boot memory area Hari Bathini

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