linux-kernel - Re: [PATCH 08/16] iommu/fsl: use page allocation function provided by iommu-pages.h

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Date:   Tue, 28 Nov 2023 22:53:04 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     Pasha Tatashin <pasha.tatashin@...een.com>,
        akpm@...ux-foundation.org, alex.williamson@...hat.com,
        alim.akhtar@...sung.com, alyssa@...enzweig.io,
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        heiko@...ech.de, iommu@...ts.linux.dev, jasowang@...hat.com,
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Subject: Re: [PATCH 08/16] iommu/fsl: use page allocation function provided by
 iommu-pages.h

On 2023-11-28 8:49 pm, Pasha Tatashin wrote:
> Convert iommu/fsl_pamu.c to use the new page allocation functions
> provided in iommu-pages.h.

Again, this is not a pagetable. This thing doesn't even *have* pagetables.

Similar to patches #1 and #2 where you're lumping in configuration 
tables which belong to the IOMMU driver itself, as opposed to pagetables 
which effectively belong to an IOMMU domain's user. But then there are 
still drivers where you're *not* accounting similar configuration 
structures, so I really struggle to see how this metric is useful when 
it's so completely inconsistent in what it's counting :/

Thanks,
Robin.

> Signed-off-by: Pasha Tatashin <pasha.tatashin@...een.com>
> ---
>   drivers/iommu/fsl_pamu.c | 5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iommu/fsl_pamu.c b/drivers/iommu/fsl_pamu.c
> index f37d3b044131..7bfb49940f0c 100644
> --- a/drivers/iommu/fsl_pamu.c
> +++ b/drivers/iommu/fsl_pamu.c
> @@ -16,6 +16,7 @@
>   #include <linux/platform_device.h>
>   
>   #include <asm/mpc85xx.h>
> +#include "iommu-pages.h"
>   
>   /* define indexes for each operation mapping scenario */
>   #define OMI_QMAN        0x00
> @@ -828,7 +829,7 @@ static int fsl_pamu_probe(struct platform_device *pdev)
>   		(PAGE_SIZE << get_order(OMT_SIZE));
>   	order = get_order(mem_size);
>   
> -	p = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
> +	p = __iommu_alloc_pages(GFP_KERNEL, order);
>   	if (!p) {
>   		dev_err(dev, "unable to allocate PAACT/SPAACT/OMT block\n");
>   		ret = -ENOMEM;
> @@ -916,7 +917,7 @@ static int fsl_pamu_probe(struct platform_device *pdev)
>   		iounmap(guts_regs);
>   
>   	if (ppaact)
> -		free_pages((unsigned long)ppaact, order);
> +		iommu_free_pages(ppaact, order);
>   
>   	ppaact = NULL;
>