Re: [PATCH 12/21] drm/i915/gtt: Introduce kmap|kunmap for dma page

[Michel Thierry <michel.thierry@intel.com>]

On 5/22/2015 6:05 PM, Mika Kuoppala wrote:
> As there is flushing involved when we have done the cpu
> write, make functions for mapping for cpu space. Make macros
> to map any type of paging structure.
>
> v2: Make it clear tha flushing kunmap is only for ppgtt (Ville)
>
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
> ---
>   drivers/gpu/drm/i915/i915_gem_gtt.c | 73 +++++++++++++++++++------------------
>   1 file changed, 38 insertions(+), 35 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> index d020b5e..072295f 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> @@ -330,19 +330,35 @@ static void cleanup_page_dma(struct drm_device *dev, struct i915_page_dma *p)
>          memset(p, 0, sizeof(*p));
>   }
>
> +static void *kmap_page_dma(struct i915_page_dma *p)
> +{
> +       return kmap_atomic(p->page);
> +}
> +
> +/* We use the flushing unmap only with ppgtt structures:
> + * page directories, page tables and scratch pages.
> + */
> +static void kunmap_page_dma(struct drm_device *dev, void *vaddr)
> +{
> +       if (!HAS_LLC(dev) && !IS_VALLEYVIEW(dev))
> +               drm_clflush_virt_range(vaddr, PAGE_SIZE);

Same comment as in the previous patch (at least IS_CHERRYVIEW, until we 
have more insights in bxt).

> +
> +       kunmap_atomic(vaddr);
> +}
> +
> +#define kmap_px(px) kmap_page_dma(&(px)->base)
> +#define kunmap_px(ppgtt, vaddr) kunmap_page_dma((ppgtt)->base.dev, (vaddr));
> +
>   static void fill_page_dma(struct drm_device *dev, struct i915_page_dma *p,
>                            const uint64_t val)
>   {
>          int i;
> -       uint64_t * const vaddr = kmap_atomic(p->page);
> +       uint64_t * const vaddr = kmap_page_dma(p);
>
>          for (i = 0; i < 512; i++)
>                  vaddr[i] = val;
>
> -       if (!HAS_LLC(dev) && !IS_VALLEYVIEW(dev))
> -               drm_clflush_virt_range(vaddr, PAGE_SIZE);
> -
> -       kunmap_atomic(vaddr);
> +       kunmap_page_dma(dev, vaddr);
>   }
>
>   static void fill_page_dma_32(struct drm_device *dev, struct i915_page_dma *p,
> @@ -500,7 +516,6 @@ static void gen8_ppgtt_clear_range(struct i915_address_space *vm,
>          while (num_entries) {
>                  struct i915_page_directory *pd;
>                  struct i915_page_table *pt;
> -               struct page *page_table;
>
>                  if (WARN_ON(!ppgtt->pdp.page_directory[pdpe]))
>                          continue;
> @@ -515,22 +530,18 @@ static void gen8_ppgtt_clear_range(struct i915_address_space *vm,
>                  if (WARN_ON(!pt->base.page))
>                          continue;
>
> -               page_table = pt->base.page;
> -
>                  last_pte = pte + num_entries;
>                  if (last_pte > GEN8_PTES)
>                          last_pte = GEN8_PTES;
>
> -               pt_vaddr = kmap_atomic(page_table);
> +               pt_vaddr = kmap_px(pt);
>
>                  for (i = pte; i < last_pte; i++) {
>                          pt_vaddr[i] = scratch_pte;
>                          num_entries--;
>                  }
>
> -               if (!HAS_LLC(ppgtt->base.dev))
> -                       drm_clflush_virt_range(pt_vaddr, PAGE_SIZE);
> -               kunmap_atomic(pt_vaddr);
> +               kunmap_px(ppgtt, pt);
>
>                  pte = 0;
>                  if (++pde == I915_PDES) {
> @@ -562,18 +573,14 @@ static void gen8_ppgtt_insert_entries(struct i915_address_space *vm,
>                  if (pt_vaddr == NULL) {
>                          struct i915_page_directory *pd = ppgtt->pdp.page_directory[pdpe];
>                          struct i915_page_table *pt = pd->page_table[pde];
> -                       struct page *page_table = pt->base.page;
> -
> -                       pt_vaddr = kmap_atomic(page_table);
> +                       pt_vaddr = kmap_px(pt);
>                  }
>
>                  pt_vaddr[pte] =
>                          gen8_pte_encode(sg_page_iter_dma_address(&sg_iter),
>                                          cache_level, true);
>                  if (++pte == GEN8_PTES) {
> -                       if (!HAS_LLC(ppgtt->base.dev))
> -                               drm_clflush_virt_range(pt_vaddr, PAGE_SIZE);
> -                       kunmap_atomic(pt_vaddr);
> +                       kunmap_px(ppgtt, pt_vaddr);
>                          pt_vaddr = NULL;
>                          if (++pde == I915_PDES) {
>                                  pdpe++;
> @@ -582,11 +589,9 @@ static void gen8_ppgtt_insert_entries(struct i915_address_space *vm,
>                          pte = 0;
>                  }
>          }
> -       if (pt_vaddr) {
> -               if (!HAS_LLC(ppgtt->base.dev))
> -                       drm_clflush_virt_range(pt_vaddr, PAGE_SIZE);
> -               kunmap_atomic(pt_vaddr);
> -       }
> +
> +       if (pt_vaddr)
> +               kunmap_px(ppgtt, pt_vaddr);
>   }
>
>   static void __gen8_do_map_pt(gen8_pde_t * const pde,
> @@ -865,7 +870,7 @@ static int gen8_alloc_va_range(struct i915_address_space *vm,
>          /* Allocations have completed successfully, so set the bitmaps, and do
>           * the mappings. */
>          gen8_for_each_pdpe(pd, &ppgtt->pdp, start, length, temp, pdpe) {
> -               gen8_pde_t *const page_directory = kmap_atomic(pd->base.page);
> +               gen8_pde_t *const page_directory = kmap_px(pd);
>                  struct i915_page_table *pt;
>                  uint64_t pd_len = gen8_clamp_pd(start, length);
>                  uint64_t pd_start = start;
> @@ -895,10 +900,7 @@ static int gen8_alloc_va_range(struct i915_address_space *vm,
>                           * point we're still relying on insert_entries() */
>                  }
>
> -               if (!HAS_LLC(vm->dev))
> -                       drm_clflush_virt_range(page_directory, PAGE_SIZE);
> -
> -               kunmap_atomic(page_directory);
> +               kunmap_px(ppgtt, page_directory);
>
>                  set_bit(pdpe, ppgtt->pdp.used_pdpes);
>          }
> @@ -1030,7 +1032,8 @@ static void gen6_dump_ppgtt(struct i915_hw_ppgtt *ppgtt, struct seq_file *m)
>                                     expected);
>                  seq_printf(m, "\tPDE: %x\n", pd_entry);
>
> -               pt_vaddr = kmap_atomic(ppgtt->pd.page_table[pde]->base.page);
> +               pt_vaddr = kmap_px(ppgtt->pd.page_table[pde]);
> +
>                  for (pte = 0; pte < GEN6_PTES; pte+=4) {
>                          unsigned long va =
>                                  (pde * PAGE_SIZE * GEN6_PTES) +
> @@ -1052,7 +1055,7 @@ static void gen6_dump_ppgtt(struct i915_hw_ppgtt *ppgtt, struct seq_file *m)
>                          }
>                          seq_puts(m, "\n");
>                  }
> -               kunmap_atomic(pt_vaddr);
> +               kunmap_px(ppgtt, pt_vaddr);
>          }
>   }
>
> @@ -1255,12 +1258,12 @@ static void gen6_ppgtt_clear_range(struct i915_address_space *vm,
>                  if (last_pte > GEN6_PTES)
>                          last_pte = GEN6_PTES;
>
> -               pt_vaddr = kmap_atomic(ppgtt->pd.page_table[act_pt]->base.page);
> +               pt_vaddr = kmap_px(ppgtt->pd.page_table[act_pt]);
>
>                  for (i = first_pte; i < last_pte; i++)
>                          pt_vaddr[i] = scratch_pte;
>
> -               kunmap_atomic(pt_vaddr);
> +               kunmap_px(ppgtt, pt_vaddr);
>
>                  num_entries -= last_pte - first_pte;
>                  first_pte = 0;
> @@ -1284,21 +1287,21 @@ static void gen6_ppgtt_insert_entries(struct i915_address_space *vm,
>          pt_vaddr = NULL;
>          for_each_sg_page(pages->sgl, &sg_iter, pages->nents, 0) {
>                  if (pt_vaddr == NULL)
> -                       pt_vaddr = kmap_atomic(ppgtt->pd.page_table[act_pt]->base.page);
> +                       pt_vaddr = kmap_px(ppgtt->pd.page_table[act_pt]);
>
>                  pt_vaddr[act_pte] =
>                          vm->pte_encode(sg_page_iter_dma_address(&sg_iter),
>                                         cache_level, true, flags);
>
>                  if (++act_pte == GEN6_PTES) {
> -                       kunmap_atomic(pt_vaddr);
> +                       kunmap_px(ppgtt, pt_vaddr);
>                          pt_vaddr = NULL;
>                          act_pt++;
>                          act_pte = 0;
>                  }
>          }
>          if (pt_vaddr)
> -               kunmap_atomic(pt_vaddr);
> +               kunmap_px(ppgtt, pt_vaddr);
>   }
>
>   static void gen6_initialize_pt(struct i915_address_space *vm,
> --
> 1.9.1
>
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