On Mon, Nov 18, 2019 at 11:35:22AM +0100, Daniel Vetter wrote:
> A few reasons to drop kmap:
>
> - For native objects all we do is look at obj->vaddr anyway, so might
> as well not call functions for every page.
>
> - Reloc-processing on dma-buf is ... questionable.
>
> - Plus most dma-buf that bother kernel cpu mmaps give you at least
> vmap, much less kmaps. And all the ones relevant for arm-soc are
> again doing a obj->vaddr game anyway, there's no real kmap going on
> on arm it seems.
>
> Plus this seems to be the only real in-tree user of dma_buf_kmap, and
> I'd like to get rid of that.
>
> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
> Cc: Thierry Reding <thierry.reding@xxxxxxxxx>
> Cc: linux-tegra@xxxxxxxxxxxxxxx
> ---
> drivers/gpu/host1x/job.c | 21 +++++++--------------
> 1 file changed, 7 insertions(+), 14 deletions(-)
This looks correct to me, and running some of the grate project's tests
against this works just fine, so:
Reviewed-by: Thierry Reding <treding@xxxxxxxxxx>
Tested-by: Thierry Reding <treding@xxxxxxxxxx>
> diff --git a/drivers/gpu/host1x/job.c b/drivers/gpu/host1x/job.c
> index 25ca54de8fc5..60b2fedd0061 100644
> --- a/drivers/gpu/host1x/job.c
> +++ b/drivers/gpu/host1x/job.c
> @@ -244,8 +244,7 @@ static unsigned int pin_job(struct host1x *host, struct host1x_job *job)
>
> static int do_relocs(struct host1x_job *job, struct host1x_job_gather *g)
> {
> - u32 last_page = ~0;
> - void *cmdbuf_page_addr = NULL;
> + void *cmdbuf_addr = NULL;
> struct host1x_bo *cmdbuf = g->bo;
> unsigned int i;
>
> @@ -267,28 +266,22 @@ static int do_relocs(struct host1x_job *job, struct host1x_job_gather *g)
> goto patch_reloc;
> }
>
> - if (last_page != reloc->cmdbuf.offset >> PAGE_SHIFT) {
> - if (cmdbuf_page_addr)
> - host1x_bo_kunmap(cmdbuf, last_page,
> - cmdbuf_page_addr);
> + if (!cmdbuf_addr) {
> + cmdbuf_addr = host1x_bo_mmap(cmdbuf);
>
> - cmdbuf_page_addr = host1x_bo_kmap(cmdbuf,
> - reloc->cmdbuf.offset >> PAGE_SHIFT);
> - last_page = reloc->cmdbuf.offset >> PAGE_SHIFT;
> -
> - if (unlikely(!cmdbuf_page_addr)) {
> + if (unlikely(!cmdbuf_addr)) {
> pr_err("Could not map cmdbuf for relocation\n");
> return -ENOMEM;
> }
> }
>
> - target = cmdbuf_page_addr + (reloc->cmdbuf.offset & ~PAGE_MASK);
> + target = cmdbuf_addr + reloc->cmdbuf.offset;
> patch_reloc:
> *target = reloc_addr;
> }
>
> - if (cmdbuf_page_addr)
> - host1x_bo_kunmap(cmdbuf, last_page, cmdbuf_page_addr);
> + if (cmdbuf_addr)
> + host1x_bo_munmap(cmdbuf, cmdbuf_addr);
>
> return 0;
> }
> --
> 2.24.0
>
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