On 2021-07-05 at 14:53:06 +0100, Matthew Auld wrote:
> For discrete, users of pin_map() needs to obey the same rules at the TTM
> backend, where we map system only objects as WB, and everything else as
> WC. The simplest for now is to just force the correct mapping type as
> per the new rules for discrete.
>
> Suggested-by: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
> Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx>
> Cc: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
> Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Cc: Ramalingam C <ramalingam.c@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/gem/i915_gem_object.c | 34 ++++++++++++++++++++++
> drivers/gpu/drm/i915/gem/i915_gem_object.h | 4 +++
> drivers/gpu/drm/i915/gem/i915_gem_pages.c | 22 ++++++++++++--
> 3 files changed, 58 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.c b/drivers/gpu/drm/i915/gem/i915_gem_object.c
> index 547cc9dad90d..9da7b288b7ed 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_object.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_object.c
> @@ -625,6 +625,40 @@ int i915_gem_object_migrate(struct drm_i915_gem_object *obj,
> return obj->ops->migrate(obj, mr);
> }
>
> +/**
> + * i915_gem_object_placement_possible - Check whether the object can be
> + * placed at certain memory type
> + * @obj: Pointer to the object
> + * @type: The memory type to check
> + *
> + * Return: True if the object can be placed in @type. False otherwise.
> + */
> +bool i915_gem_object_placement_possible(struct drm_i915_gem_object *obj,
> + enum intel_memory_type type)
> +{
> + unsigned int i;
> +
> + if (!obj->mm.n_placements) {
> + switch (type) {
> + case INTEL_MEMORY_LOCAL:
> + return i915_gem_object_has_iomem(obj);
> + case INTEL_MEMORY_SYSTEM:
> + return i915_gem_object_has_pages(obj);
> + default:
> + /* Ignore stolen for now */
> + GEM_BUG_ON(1);
> + return false;
> + }
> + }
> +
> + for (i = 0; i < obj->mm.n_placements; i++) {
> + if (obj->mm.placements[i]->type == type)
> + return true;
> + }
> +
> + return false;
> +}
> +
> void i915_gem_init__objects(struct drm_i915_private *i915)
> {
> INIT_WORK(&i915->mm.free_work, __i915_gem_free_work);
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h
> index d423d8cac4f2..8be4fadeee48 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_object.h
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h
> @@ -12,6 +12,7 @@
> #include <drm/drm_device.h>
>
> #include "display/intel_frontbuffer.h"
> +#include "intel_memory_region.h"
> #include "i915_gem_object_types.h"
> #include "i915_gem_gtt.h"
> #include "i915_gem_ww.h"
> @@ -607,6 +608,9 @@ bool i915_gem_object_can_migrate(struct drm_i915_gem_object *obj,
> int i915_gem_object_wait_migration(struct drm_i915_gem_object *obj,
> unsigned int flags);
>
> +bool i915_gem_object_placement_possible(struct drm_i915_gem_object *obj,
> + enum intel_memory_type type);
> +
> #ifdef CONFIG_MMU_NOTIFIER
> static inline bool
> i915_gem_object_is_userptr(struct drm_i915_gem_object *obj)
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pages.c b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
> index f2f850e31b8e..810a157a18f8 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_pages.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
> @@ -321,8 +321,7 @@ static void *i915_gem_object_map_pfn(struct drm_i915_gem_object *obj,
> dma_addr_t addr;
> void *vaddr;
>
> - if (type != I915_MAP_WC)
> - return ERR_PTR(-ENODEV);
> + GEM_BUG_ON(type != I915_MAP_WC);
>
> if (n_pfn > ARRAY_SIZE(stack)) {
> /* Too big for stack -- allocate temporary array instead */
> @@ -374,6 +373,25 @@ void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj,
> }
> GEM_BUG_ON(!i915_gem_object_has_pages(obj));
>
> + /*
> + * For discrete our CPU mappings needs to be consistent in order to
> + * function correctly on !x86. When mapping things through TTM, we use
> + * the same rules to determine the caching type.
> + *
> + * Internal users of lmem are already expected to get this right, so no
> + * fudging needed there.
> + */
> + if (i915_gem_object_placement_possible(obj, INTEL_MEMORY_LOCAL)) {
> + if (type != I915_MAP_WC && !obj->mm.n_placements) {
> + ptr = ERR_PTR(-ENODEV);
> + goto err_unpin;
> + }
> +
> + type = I915_MAP_WC;
> + } else if (IS_DGFX(to_i915(obj->base.dev))) {
> + type = I915_MAP_WB;
> + }
Looks good to me.
Reviewed-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
> +
> ptr = page_unpack_bits(obj->mm.mapping, &has_type);
> if (ptr && has_type != type) {
> if (pinned) {
> --
> 2.26.3
>
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