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SubjectRe: [Intel-gfx] [PATCH v7 14/15] drm/i915/gsc: allocate extended operational memory in LMEM
On Sat, 6 Aug 2022 at 13:34, Tomas Winkler <tomas.winkler@intel.com> wrote:
>
> GSC requires more operational memory than available on chip.
> Reserve 4M of LMEM for GSC operation. The memory is provided to the
> GSC as struct resource to the auxiliary data of the child device.
>
> Cc: Alan Previn <alan.previn.teres.alexis@intel.com>
> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
> Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
> Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
> ---
> drivers/gpu/drm/i915/gt/intel_gsc.c | 91 ++++++++++++++++++++++++++---
> drivers/gpu/drm/i915/gt/intel_gsc.h | 3 +
> 2 files changed, 87 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_gsc.c b/drivers/gpu/drm/i915/gt/intel_gsc.c
> index e1040c8f2fd3..162bea57fbb5 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gsc.c
> +++ b/drivers/gpu/drm/i915/gt/intel_gsc.c
> @@ -7,6 +7,7 @@
> #include <linux/mei_aux.h>
> #include "i915_drv.h"
> #include "i915_reg.h"
> +#include "gem/i915_gem_region.h"
> #include "gt/intel_gsc.h"
> #include "gt/intel_gt.h"
>
> @@ -36,12 +37,68 @@ static int gsc_irq_init(int irq)
> return irq_set_chip_data(irq, NULL);
> }
>
> +static int
> +gsc_ext_om_alloc(struct intel_gsc *gsc, struct intel_gsc_intf *intf, size_t size)
> +{
> + struct intel_gt *gt = gsc_to_gt(gsc);
> + struct drm_i915_gem_object *obj;
> + void *vaddr;
> + int err;
> +
> + obj = i915_gem_object_create_lmem(gt->i915, size, I915_BO_ALLOC_CONTIGUOUS);
> + if (IS_ERR(obj)) {
> + drm_err(&gt->i915->drm, "Failed to allocate gsc memory\n");
> + return PTR_ERR(obj);
> + }
> +
> + err = i915_gem_object_pin_pages_unlocked(obj);
> + if (err) {
> + drm_err(&gt->i915->drm, "Failed to pin pages for gsc memory\n");
> + goto out_put;
> + }
> +
> + vaddr = i915_gem_object_pin_map_unlocked(obj, i915_coherent_map_type(gt->i915, obj, true));
> + if (IS_ERR(vaddr)) {
> + err = PTR_ERR(vaddr);
> + drm_err(&gt->i915->drm, "Failed to map gsc memory\n");
> + goto out_unpin;
> + }
> +
> + memset(vaddr, 0, obj->base.size);
> +
> + i915_gem_object_unpin_map(obj);

I think this was mentioned before, here we should rather use:

create_lmem(gt->i915, size,
I915_BO_ALLOC_CONTIGUOUS |
I915_BO_ALLOC_CPU_CLEAR);

That way we don't need to manually map and clear it here. Instead when
first allocating the pages (like with pin_pages), the clear will be
done for you.

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