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From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Yinghai Lu <yinghai@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
	"H. Peter Anvin" <hpa@zytor.com>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Jan Kiszka <jan.kiszka@web.de>,
	Jason Wessel <jason.wessel@windriver.com>,
	Borislav Petkov <bp@alien8.de>,
	linux-kernel@vger.kernel.org, Joerg Roedel <joro@8bytes.org>,
	Ralf Baechle <ralf@linux-mips.org>,
	Jeremy Fitzhardinge <jeremy@goop.org>,
	Kyungmin Park <kyungmin.park@samsung.com>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Andrzej Pietrasiewicz <andrzej.p@samsung.com>,
	linux-mips@linux-mips.org, xen-devel@lists.xensource.com,
	virtualization@lists.linux-foundation.org,
	Shuah Khan <shuahkhan@gmail.com>
Subject: Re: [PATCH 35/35] x86: Don't panic if can not alloc buffer for swiotlb
Date: Fri, 25 Jan 2013 11:47:49 -0500	[thread overview]
Message-ID: <20130125164749.GB27244@phenom.dumpdata.com> (raw)
In-Reply-To: <1359058816-7615-36-git-send-email-yinghai@kernel.org>

On Thu, Jan 24, 2013 at 12:20:16PM -0800, Yinghai Lu wrote:
> Normal boot path on system with iommu support:
> swiotlb buffer will be allocated early at first and then try to initialize
> iommu, if iommu for intel or AMD could setup properly, swiotlb buffer
> will be freed.
> 
> The early allocating is with bootmem, and could panic when we try to use
> kdump with buffer above 4G only, or with memmap to limit mem under 4G.
> for example: memmap=4095M$1M to remove memory under 4G.
> 
> According to Eric, add _nopanic version and no_iotlb_memory to fail
> map single later if swiotlb is still needed.
> 
> -v2: don't pass nopanic, and use -ENOMEM return value according to Eric.
>      panic early instead of using swiotlb_full to panic...according to Eric/Konrad.
> -v3: make swiotlb_init to be notpanic, but will affect:
>      arm64, ia64, powerpc, tile, unicore32, x86.
> -v4: cleanup swiotlb_init by removing swiotlb_init_with_default_size.
> 
> Suggested-by: Eric W. Biederman <ebiederm@xmission.com>
> Signed-off-by: Yinghai Lu <yinghai@kernel.org>
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Tested-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

:-)

> Cc: Joerg Roedel <joro@8bytes.org>
> Cc: Ralf Baechle <ralf@linux-mips.org>
> Cc: Jeremy Fitzhardinge <jeremy@goop.org>
> Cc: Kyungmin Park <kyungmin.park@samsung.com>
> Cc: Marek Szyprowski <m.szyprowski@samsung.com>
> Cc: Arnd Bergmann <arnd@arndb.de>
> Cc: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
> Cc: linux-mips@linux-mips.org
> Cc: xen-devel@lists.xensource.com
> Cc: virtualization@lists.linux-foundation.org
> Cc: Shuah Khan <shuahkhan@gmail.com>
> ---
>  arch/mips/cavium-octeon/dma-octeon.c |    3 ++-
>  drivers/xen/swiotlb-xen.c            |    4 ++-
>  include/linux/swiotlb.h              |    2 +-
>  lib/swiotlb.c                        |   47 +++++++++++++++++++++-------------
>  4 files changed, 35 insertions(+), 21 deletions(-)
> 
> diff --git a/arch/mips/cavium-octeon/dma-octeon.c b/arch/mips/cavium-octeon/dma-octeon.c
> index 41dd0088..02f2444 100644
> --- a/arch/mips/cavium-octeon/dma-octeon.c
> +++ b/arch/mips/cavium-octeon/dma-octeon.c
> @@ -317,7 +317,8 @@ void __init plat_swiotlb_setup(void)
>  
>  	octeon_swiotlb = alloc_bootmem_low_pages(swiotlbsize);
>  
> -	swiotlb_init_with_tbl(octeon_swiotlb, swiotlb_nslabs, 1);
> +	if (swiotlb_init_with_tbl(octeon_swiotlb, swiotlb_nslabs, 1) == -ENOMEM)
> +		panic("Cannot allocate SWIOTLB buffer");
>  
>  	mips_dma_map_ops = &octeon_linear_dma_map_ops.dma_map_ops;
>  }
> diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
> index af47e75..1d94316 100644
> --- a/drivers/xen/swiotlb-xen.c
> +++ b/drivers/xen/swiotlb-xen.c
> @@ -231,7 +231,9 @@ retry:
>  	}
>  	start_dma_addr = xen_virt_to_bus(xen_io_tlb_start);
>  	if (early) {
> -		swiotlb_init_with_tbl(xen_io_tlb_start, xen_io_tlb_nslabs, verbose);
> +		if (swiotlb_init_with_tbl(xen_io_tlb_start, xen_io_tlb_nslabs,
> +			 verbose))
> +			panic("Cannot allocate SWIOTLB buffer");
>  		rc = 0;
>  	} else
>  		rc = swiotlb_late_init_with_tbl(xen_io_tlb_start, xen_io_tlb_nslabs);
> diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
> index 071d62c..2de42f9 100644
> --- a/include/linux/swiotlb.h
> +++ b/include/linux/swiotlb.h
> @@ -23,7 +23,7 @@ extern int swiotlb_force;
>  #define IO_TLB_SHIFT 11
>  
>  extern void swiotlb_init(int verbose);
> -extern void swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
> +int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
>  extern unsigned long swiotlb_nr_tbl(void);
>  extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
>  
> diff --git a/lib/swiotlb.c b/lib/swiotlb.c
> index 196b069..bfe02b8 100644
> --- a/lib/swiotlb.c
> +++ b/lib/swiotlb.c
> @@ -122,11 +122,18 @@ static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
>  	return phys_to_dma(hwdev, virt_to_phys(address));
>  }
>  
> +static bool no_iotlb_memory;
> +
>  void swiotlb_print_info(void)
>  {
>  	unsigned long bytes = io_tlb_nslabs << IO_TLB_SHIFT;
>  	unsigned char *vstart, *vend;
>  
> +	if (no_iotlb_memory) {
> +		pr_warn("software IO TLB: No low mem\n");
> +		return;
> +	}
> +
>  	vstart = phys_to_virt(io_tlb_start);
>  	vend = phys_to_virt(io_tlb_end);
>  
> @@ -136,7 +143,7 @@ void swiotlb_print_info(void)
>  	       bytes >> 20, vstart, vend - 1);
>  }
>  
> -void __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
> +int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
>  {
>  	void *v_overflow_buffer;
>  	unsigned long i, bytes;
> @@ -150,9 +157,10 @@ void __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
>  	/*
>  	 * Get the overflow emergency buffer
>  	 */
> -	v_overflow_buffer = alloc_bootmem_low_pages(PAGE_ALIGN(io_tlb_overflow));
> +	v_overflow_buffer = alloc_bootmem_low_pages_nopanic(
> +						PAGE_ALIGN(io_tlb_overflow));
>  	if (!v_overflow_buffer)
> -		panic("Cannot allocate SWIOTLB overflow buffer!\n");
> +		return -ENOMEM;
>  
>  	io_tlb_overflow_buffer = __pa(v_overflow_buffer);
>  
> @@ -169,15 +177,19 @@ void __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
>  
>  	if (verbose)
>  		swiotlb_print_info();
> +
> +	return 0;
>  }
>  
>  /*
>   * Statically reserve bounce buffer space and initialize bounce buffer data
>   * structures for the software IO TLB used to implement the DMA API.
>   */
> -static void __init
> -swiotlb_init_with_default_size(size_t default_size, int verbose)
> +void  __init
> +swiotlb_init(int verbose)
>  {
> +	/* default to 64MB */
> +	size_t default_size = 64UL<<20;
>  	unsigned char *vstart;
>  	unsigned long bytes;
>  
> @@ -188,20 +200,16 @@ swiotlb_init_with_default_size(size_t default_size, int verbose)
>  
>  	bytes = io_tlb_nslabs << IO_TLB_SHIFT;
>  
> -	/*
> -	 * Get IO TLB memory from the low pages
> -	 */
> -	vstart = alloc_bootmem_low_pages(PAGE_ALIGN(bytes));
> -	if (!vstart)
> -		panic("Cannot allocate SWIOTLB buffer");
> -
> -	swiotlb_init_with_tbl(vstart, io_tlb_nslabs, verbose);
> -}
> +	/* Get IO TLB memory from the low pages */
> +	vstart = alloc_bootmem_low_pages_nopanic(PAGE_ALIGN(bytes));
> +	if (vstart && !swiotlb_init_with_tbl(vstart, io_tlb_nslabs, verbose))
> +		return;
>  
> -void __init
> -swiotlb_init(int verbose)
> -{
> -	swiotlb_init_with_default_size(64 * (1<<20), verbose);	/* default to 64MB */
> +	if (io_tlb_start)
> +		free_bootmem(io_tlb_start,
> +				 PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
> +	pr_warn("Cannot allocate SWIOTLB buffer");
> +	no_iotlb_memory = true;
>  }
>  
>  /*
> @@ -405,6 +413,9 @@ phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
>  	unsigned long offset_slots;
>  	unsigned long max_slots;
>  
> +	if (no_iotlb_memory)
> +		panic("Can not allocate SWIOTLB buffer earlier and can't now provide you with the DMA bounce buffer");
> +
>  	mask = dma_get_seg_boundary(hwdev);
>  
>  	tbl_dma_addr &= mask;
> -- 
> 1.7.10.4
> 

  reply	other threads:[~2013-01-25 16:48 UTC|newest]

Thread overview: 89+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-01-24 20:19 [PATCH 00/35] x86, boot, 64bit: Add support for loading ramdisk and bzImage above 4G Yinghai Lu
2013-01-24 20:19 ` [PATCH 01/35] x86, mm: Fix page table early allocation offset checking Yinghai Lu
2013-01-30  1:20   ` [tip:x86/mm2] " tip-bot for Yinghai Lu
2013-01-24 20:19 ` [PATCH 02/35] x86: Handle multiple exactmaps and out of order exactmap Yinghai Lu
2013-01-24 20:19 ` [PATCH 03/35] x86, mm: Introduce memmap=reserveram Yinghai Lu
2013-01-24 20:19 ` [PATCH 04/35] x86: Clean up e820 add kernel range Yinghai Lu
2013-01-24 23:21   ` Jacob Shin
2013-01-30  1:21   ` [tip:x86/mm2] x86: Factor out e820_add_kernel_range() tip-bot for Yinghai Lu
2013-01-24 20:19 ` [PATCH 05/35] x86, 64bit, mm: Make pgd next calculation consistent with pud/pmd Yinghai Lu
2013-01-30  1:22   ` [tip:x86/mm2] " tip-bot for Yinghai Lu
2013-01-24 20:19 ` [PATCH 06/35] x86, realmode: Set real_mode permissions early Yinghai Lu
2013-01-30  1:23   ` [tip:x86/mm2] " tip-bot for Yinghai Lu
2013-01-24 20:19 ` [PATCH 07/35] x86, 64bit, mm: Add generic kernel/ident mapping helper Yinghai Lu
2013-01-30  1:24   ` [tip:x86/mm2] x86, 64bit, mm: Add generic kernel/ ident " tip-bot for Yinghai Lu
2013-01-24 20:19 ` [PATCH 08/35] x86, 64bit: Copy zero-page early Yinghai Lu
2013-01-30  1:25   ` [tip:x86/mm2] x86, 64bit: Copy struct boot_params early tip-bot for Yinghai Lu
2013-01-24 20:19 ` [PATCH 09/35] x86, 64bit, realmode: Use init_level4_pgt to set trapmoline_pgd directly Yinghai Lu
2013-01-30  1:27   ` [tip:x86/mm2] x86, 64bit, realmode: Use init_level4_pgt to set trampoline_pgd directly tip-bot for Yinghai Lu
2013-01-24 20:19 ` [PATCH 10/35] x86, realmode: Separate real_mode reserve and setup Yinghai Lu
2013-01-30  1:28   ` [tip:x86/mm2] " tip-bot for Yinghai Lu
2013-01-24 20:19 ` [PATCH 11/35] x86, 64bit: early #PF handler set page table Yinghai Lu
2013-01-30  1:29   ` [tip:x86/mm2] x86, 64bit: Use a #PF handler to materialize early mappings on demand tip-bot for H. Peter Anvin
2013-01-24 20:19 ` [PATCH 12/35] x86, 64bit: #PF handler set page to cover only 2M per #PF Yinghai Lu
2013-01-30  1:30   ` [tip:x86/mm2] " tip-bot for Yinghai Lu
2013-01-24 20:19 ` [PATCH 13/35] x86, 64bit: Don't set max_pfn_mapped wrong value early on native path Yinghai Lu
2013-01-30  1:31   ` [tip:x86/mm2] x86, 64bit: Don' t " tip-bot for Yinghai Lu
2013-01-24 20:19 ` [PATCH 14/35] x86: Merge early_reserve_initrd for 32bit and 64bit Yinghai Lu
2013-01-30  1:32   ` [tip:x86/mm2] " tip-bot for Yinghai Lu
2013-01-24 20:19 ` [PATCH 15/35] x86: Add get_ramdisk_image/size() Yinghai Lu
2013-01-30  1:34   ` [tip:x86/mm2] " tip-bot for Yinghai Lu
2013-01-24 20:19 ` [PATCH 16/35] x86, boot: Add get_cmd_line_ptr() Yinghai Lu
2013-01-30  1:35   ` [tip:x86/mm2] " tip-bot for Yinghai Lu
2013-01-24 20:19 ` [PATCH 17/35] x86, boot: Move checking of cmd_line_ptr out of common path Yinghai Lu
2013-01-30  1:36   ` [tip:x86/mm2] " tip-bot for Yinghai Lu
2013-01-24 20:19 ` [PATCH 18/35] x86, boot: Pass cmd_line_ptr with unsigned long instead Yinghai Lu
2013-01-30  1:37   ` [tip:x86/mm2] " tip-bot for Yinghai Lu
2013-01-24 20:20 ` [PATCH 19/35] x86, boot: Move verify_cpu.S and no_longmode down Yinghai Lu
2013-01-30  1:38   ` [tip:x86/mm2] " tip-bot for Yinghai Lu
2013-01-24 20:20 ` [PATCH 20/35] x86, boot: Move lldt/ltr out of 64bit code section Yinghai Lu
2013-01-30  1:39   ` [tip:x86/mm2] " tip-bot for Yinghai Lu
2013-01-24 20:20 ` [PATCH 21/35] x86, kexec: Remove 1024G limitation for kexec buffer on 64bit Yinghai Lu
2013-01-30  1:40   ` [tip:x86/mm2] " tip-bot for Yinghai Lu
2013-01-24 20:20 ` [PATCH 22/35] x86, kexec: Set ident mapping for kernel that is above max_pfn Yinghai Lu
2013-01-30  1:42   ` [tip:x86/mm2] " tip-bot for Yinghai Lu
2013-01-24 20:20 ` [PATCH 23/35] x86, kexec: Replace ident_mapping_init and init_level4_page Yinghai Lu
2013-01-30  1:43   ` [tip:x86/mm2] " tip-bot for Yinghai Lu
2013-01-24 20:20 ` [PATCH 24/35] x86, kexec, 64bit: Only set ident mapping for ram Yinghai Lu
2013-01-30  1:44   ` [tip:x86/mm2] " tip-bot for Yinghai Lu
2013-01-24 20:20 ` [PATCH 25/35] x86, boot: Add fields to support load bzImage and ramdisk above 4G Yinghai Lu
2013-01-28  0:07   ` [tip:x86/boot] x86, boot: Define the 2.12 bzImage boot protocol tip-bot for H. Peter Anvin
2013-01-29  9:48   ` [tip:x86/boot] x86, boot: Sanitize boot_params if not zeroed on creation tip-bot for H. Peter Anvin
2013-01-30  1:45   ` [tip:x86/mm2] x86, boot: enable support load bzImage and ramdisk above 4G tip-bot for Yinghai Lu
2013-01-30  1:54     ` Yinghai Lu
2013-01-30  2:18       ` H. Peter Anvin
2013-01-30  3:47   ` [tip:x86/mm2] x86, boot: Support loading bzImage, boot_params " tip-bot for Yinghai Lu
2013-01-24 20:20 ` [PATCH 26/35] x86, boot: Update comments about entries for 64bit image Yinghai Lu
2013-01-30  1:46   ` [tip:x86/mm2] " tip-bot for Yinghai Lu
2013-01-30  3:48   ` tip-bot for Yinghai Lu
2013-01-24 20:20 ` [PATCH 27/35] x86, boot: Not need to check setup_header version for setup_data Yinghai Lu
2013-01-30  1:47   ` [tip:x86/mm2] " tip-bot for Yinghai Lu
2013-01-30  3:49   ` tip-bot for Yinghai Lu
2013-01-24 20:20 ` [PATCH 28/35] memblock: Add memblock_mem_size() Yinghai Lu
2013-01-30  1:49   ` [tip:x86/mm2] " tip-bot for Yinghai Lu
2013-01-30  3:50   ` tip-bot for Yinghai Lu
2013-01-24 20:20 ` [PATCH 29/35] x86, kdump: Remove crashkernel range find limit for 64bit Yinghai Lu
2013-01-30  1:50   ` [tip:x86/mm2] " tip-bot for Yinghai Lu
2013-01-30  3:51   ` tip-bot for Yinghai Lu
2013-01-24 20:20 ` [PATCH 30/35] x86: Add Crash kernel low reservation Yinghai Lu
2013-01-30  1:51   ` [tip:x86/mm2] " tip-bot for Yinghai Lu
2013-02-07  5:14     ` Rob Landley
2013-02-07  6:39       ` Yinghai Lu
2013-01-30  3:52   ` tip-bot for Yinghai Lu
2013-01-24 20:20 ` [PATCH 31/35] x86: Merge early kernel reserve for 32bit and 64bit Yinghai Lu
2013-01-30  1:52   ` [tip:x86/mm2] " tip-bot for Yinghai Lu
2013-01-30  3:53   ` tip-bot for Yinghai Lu
2013-01-24 20:20 ` [PATCH 32/35] x86, 64bit, mm: Mark data/bss/brk to nx Yinghai Lu
2013-01-30  1:53   ` [tip:x86/mm2] " tip-bot for Yinghai Lu
2013-01-30  3:55   ` tip-bot for Yinghai Lu
2013-01-24 20:20 ` [PATCH 33/35] x86, 64bit, mm: hibernate use generic mapping_init Yinghai Lu
2013-01-24 22:50   ` Rafael J. Wysocki
2013-01-30  1:54   ` [tip:x86/mm2] " tip-bot for Yinghai Lu
2013-01-30  3:56   ` tip-bot for Yinghai Lu
2013-01-24 20:20 ` [PATCH 34/35] mm: Add alloc_bootmem_low_pages_nopanic() Yinghai Lu
2013-01-30  1:56   ` [tip:x86/mm2] " tip-bot for Yinghai Lu
2013-01-30  3:57   ` tip-bot for Yinghai Lu
2013-01-24 20:20 ` [PATCH 35/35] x86: Don't panic if can not alloc buffer for swiotlb Yinghai Lu
2013-01-25 16:47   ` Konrad Rzeszutek Wilk [this message]
2013-01-30  1:57   ` [tip:x86/mm2] x86: Don' t " tip-bot for Yinghai Lu
2013-01-30  3:58   ` tip-bot for Yinghai Lu

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