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

Robin Murphy
2023-11-28T22:53:30Z

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@soleen.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;