linux-kernel - Re: [PATCH 1/2] resource: add walk_system_ram_res

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Date:   Tue, 14 Nov 2023 15:17:45 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Baoquan He <bhe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
        x86@...nel.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org, ebiederm@...ssion.com,
        takahiro.akashi@...aro.org
Subject: Re: [PATCH 1/2] resource: add walk_system_ram_res_rev()

On Tue, 14 Nov 2023 17:16:57 +0800 Baoquan He <bhe@...hat.com> wrote:

> This function, being a variant of walk_system_ram_res() introduced in
> commit 8c86e70acead ("resource: provide new functions to walk through
> resources"), walks through a list of all the resources of System RAM
> in reversed order, i.e., from higher to lower.
> 
> It will be used in kexec_file code to load kernel, initrd etc when
> preparing kexec reboot.
>
> ...
>
> +/*
> + * This function, being a variant of walk_system_ram_res(), calls the @func
> + * callback against all memory ranges of type System RAM which are marked as
> + * IORESOURCE_SYSTEM_RAM and IORESOUCE_BUSY in reversed order, i.e., from
> + * higher to lower.
> + */
> +int walk_system_ram_res_rev(u64 start, u64 end, void *arg,
> +				int (*func)(struct resource *, void *))
> +{
> +	struct resource res, *rams;
> +	int rams_size = 16, i;
> +	unsigned long flags;
> +	int ret = -1;
> +
> +	/* create a list */
> +	rams = kvcalloc(rams_size, sizeof(struct resource), GFP_KERNEL);
> +	if (!rams)
> +		return ret;
> +
> +	flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
> +	i = 0;
> +	while ((start < end) &&
> +		(!find_next_iomem_res(start, end, flags, IORES_DESC_NONE, &res))) {
> +		if (i >= rams_size) {
> +			/* re-alloc */
> +			struct resource *rams_new;
> +			int rams_new_size;
> +
> +			rams_new_size = rams_size + 16;
> +			rams_new = kvcalloc(rams_new_size, sizeof(struct resource),
> +					    GFP_KERNEL);

kvrealloc()?

> +			if (!rams_new)
> +				goto out;
> +
> +			memcpy(rams_new, rams,
> +					sizeof(struct resource) * rams_size);
> +			kvfree(rams);
> +			rams = rams_new;
> +			rams_size = rams_new_size;
> +		}
> +
> +		rams[i].start = res.start;
> +		rams[i++].end = res.end;
> +
> +		start = res.end + 1;
> +	}
> +
> +	/* go reverse */
> +	for (i--; i >= 0; i--) {
> +		ret = (*func)(&rams[i], arg);
> +		if (ret)
> +			break;
> +	}
> +
> +out:
> +	kvfree(rams);
> +	return ret;
> +}
> +
>  /*
>   * This function calls the @func callback against all memory ranges, which
>   * are ranges marked as IORESOURCE_MEM and IORESOUCE_BUSY.
> -- 
> 2.41.0