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64 lines
2.1 KiB
Diff
64 lines
2.1 KiB
Diff
From 80e725d441dc2c97d04a49fb5ea71f72e3da80ef Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Fri, 4 Aug 2023 11:26:10 +0100
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Subject: [PATCH] drm/v3d: Improve MMU support for larger pages
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The built-in MMU driver went most of the way towards supporting larger
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kernel pages, but dropped the ball when it comes to calculating indexes
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into the page table. Fix it.
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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drivers/gpu/drm/v3d/v3d_mmu.c | 15 ++++++++-------
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1 file changed, 8 insertions(+), 7 deletions(-)
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--- a/drivers/gpu/drm/v3d/v3d_mmu.c
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+++ b/drivers/gpu/drm/v3d/v3d_mmu.c
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@@ -22,6 +22,7 @@
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#include "v3d_regs.h"
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#define V3D_MMU_PAGE_SHIFT 12
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+#define V3D_PAGE_FACTOR (PAGE_SIZE >> V3D_MMU_PAGE_SHIFT)
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/* Note: All PTEs for the 1MB superpage must be filled with the
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* superpage bit set.
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@@ -88,7 +89,7 @@ void v3d_mmu_insert_ptes(struct v3d_bo *
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{
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struct drm_gem_shmem_object *shmem_obj = &bo->base;
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struct v3d_dev *v3d = to_v3d_dev(shmem_obj->base.dev);
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- u32 page = bo->node.start;
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+ u32 page = bo->node.start * V3D_PAGE_FACTOR;
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u32 page_prot = V3D_PTE_WRITEABLE | V3D_PTE_VALID;
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struct sg_dma_page_iter dma_iter;
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@@ -98,13 +99,13 @@ void v3d_mmu_insert_ptes(struct v3d_bo *
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u32 pte = page_prot | page_address;
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u32 i;
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- BUG_ON(page_address + (PAGE_SIZE >> V3D_MMU_PAGE_SHIFT) >=
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+ BUG_ON(page_address + V3D_PAGE_FACTOR >=
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BIT(24));
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- for (i = 0; i < PAGE_SIZE >> V3D_MMU_PAGE_SHIFT; i++)
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+ for (i = 0; i < V3D_PAGE_FACTOR; i++)
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v3d->pt[page++] = pte + i;
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}
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- WARN_ON_ONCE(page - bo->node.start !=
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+ WARN_ON_ONCE(page - (bo->node.start * V3D_PAGE_FACTOR) !=
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shmem_obj->base.size >> V3D_MMU_PAGE_SHIFT);
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if (v3d_mmu_flush_all(v3d))
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@@ -115,10 +116,10 @@ void v3d_mmu_remove_ptes(struct v3d_bo *
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{
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struct v3d_dev *v3d = to_v3d_dev(bo->base.base.dev);
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u32 npages = bo->base.base.size >> V3D_MMU_PAGE_SHIFT;
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- u32 page;
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+ u32 page = bo->node.start * V3D_PAGE_FACTOR;
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- for (page = bo->node.start; page < bo->node.start + npages; page++)
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- v3d->pt[page] = 0;
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+ while (npages--)
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+ v3d->pt[page++] = 0;
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if (v3d_mmu_flush_all(v3d))
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dev_err(v3d->drm.dev, "MMU flush timeout\n");
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