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disp msm: sde: add get gem buffer utility

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This change adds a utility for mapping gem buffer objects based
on a frame buffer object. This utility will be used as
a basis for different driver components.

Change-Id: Ia9f2a42a9f8898c98478091b8e1cd06849145417
Signed-off-by: Nilaan Gunabalachandran <ngunabal@codeaurora.org>
This commit is contained in:
Nilaan Gunabalachandran
2021-03-04 08:41:06 -05:00
parent 0bc7a635f6
commit 9f954a19ff
2 changed files with 93 additions and 0 deletions
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72
msm/msm_gem.c
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@@ -28,6 +28,9 @@
#include "msm_mmu.h"
#include "sde_dbg.h"
#define GUARD_BYTES (BIT(8) - 1)
#define ALIGNED_OFFSET (U32_MAX & ~(GUARD_BYTES))
static void msm_gem_vunmap_locked(struct drm_gem_object *obj);
@@ -1395,3 +1398,72 @@ void msm_gem_object_set_name(struct drm_gem_object *bo, const char *fmt, ...)
vsnprintf(msm_obj->name, sizeof(msm_obj->name), fmt, ap);
va_end(ap);
}
void msm_gem_put_buffer(struct drm_gem_object *gem)
{
struct msm_gem_object *msm_gem;
if (!gem)
return;
msm_gem = to_msm_bo(gem);
msm_gem_put_iova(gem, msm_gem->aspace);
msm_gem_put_vaddr(gem);
}
int msm_gem_get_buffer(struct drm_gem_object *gem,
struct drm_device *dev, struct drm_framebuffer *fb,
uint32_t align_size)
{
struct msm_gem_object *msm_gem;
uint32_t size;
uint64_t iova_aligned;
int ret = -EINVAL;
if (!gem) {
DRM_ERROR("invalid drm gem");
return ret;
}
msm_gem = to_msm_bo(gem);
size = PAGE_ALIGN(gem->size);
if (size < (align_size + GUARD_BYTES)) {
DRM_ERROR("invalid gem size");
goto exit;
}
msm_gem_smmu_address_space_get(dev, MSM_SMMU_DOMAIN_UNSECURE);
if (PTR_ERR(msm_gem->aspace) == -ENODEV) {
DRM_DEBUG("IOMMU not present, relying on VRAM.");
} else if (IS_ERR_OR_NULL(msm_gem->aspace)) {
ret = PTR_ERR(msm_gem->aspace);
DRM_ERROR("failed to get aspace");
goto exit;
}
ret = msm_gem_get_iova(gem, msm_gem->aspace, &msm_gem->iova);
if (ret) {
DRM_ERROR("failed to get the iova ret %d", ret);
goto exit;
}
msm_gem_get_vaddr(gem);
if (IS_ERR_OR_NULL(msm_gem->vaddr)) {
DRM_ERROR("failed to get vaddr");
goto exit;
}
iova_aligned = (msm_gem->iova + GUARD_BYTES) & ALIGNED_OFFSET;
msm_gem->offset = iova_aligned - msm_gem->iova;
msm_gem->iova = msm_gem->iova + msm_gem->offset;
return 0;
exit:
msm_gem_put_buffer(gem);
return ret;
}