[Xen-devel] [PATCH v03 10/10] arm: omap: introduce print pagetable function for GPU remoteproc

[Andrii Tseglytskyi <andrii.tseglytskyi@xxxxxxxxxxxxxxx>]

This patch adds a possibility to dump all pagetables of
GPU remoteproc. The only reason to have this patch - is a
low level debug.

Signed-off-by: Andrii Tseglytskyi <andrii.tseglytskyi@xxxxxxxxxxxxxxx>
---
 xen/arch/arm/remoteproc/omap_iommu.c | 59 ++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/xen/arch/arm/remoteproc/omap_iommu.c 
b/xen/arch/arm/remoteproc/omap_iommu.c
index 70867e9..cf43250 100644
--- a/xen/arch/arm/remoteproc/omap_iommu.c
+++ b/xen/arch/arm/remoteproc/omap_iommu.c
@@ -76,6 +76,7 @@ static paddr_t mmu_ipu_translate_pagetable(struct mmu_info 
*mmu, struct mmu_page
 static paddr_t mmu_gpu_translate_pagetable(struct mmu_info *mmu, struct 
mmu_pagetable *pgt);
 
 static void mmu_ipu_print_pagetables(struct mmu_info *mmu);
+static void mmu_gpu_print_pagetables(struct mmu_info *mmu);
 
 static u32 ipu_trap_offsets[] = {
     MMU_IPU_TTB_OFFSET,
@@ -128,6 +129,7 @@ struct mmu_info omap_gpu_mmu = {
     .num_traps      = ARRAY_SIZE(sgx_trap_offsets),
     .copy_pagetable_pfunc      = mmu_omap_copy_pagetable,
     .translate_pfunc    = mmu_gpu_translate_pagetable,
+    .print_pagetable_pfunc     = mmu_gpu_print_pagetables,
 };
 
 static bool translate_supersections_to_pages = true;
@@ -425,6 +427,63 @@ static paddr_t mmu_ipu_translate_pagetable(struct mmu_info 
*mmu, struct mmu_page
     return __pa(hyp_pgt);
 }
 
+static void mmu_gpu_print_one_pagetable(struct mmu_info *mmu, struct 
mmu_pagetable *pgt, u32 index)
+{
+    u32 *pagetable;
+    u32 i, page_counter = 0;
+
+    ASSERT(pgt);
+    ASSERT(pgt->hyp_pagetable);
+    ASSERT(pgt->paddr);
+    ASSERT(pgt->maddr);
+
+    pagetable = pgt->hyp_pagetable;
+
+    pr_mmu(mmu, "pgt[%u][0x%"PRIpaddr"][0x%"PRIpaddr"]", index, pgt->paddr, 
pgt->maddr);
+    /* 1-st level translation */
+    for ( i = 0; i < MMU_PTRS_PER_PGD(mmu); i++ )
+    {
+        paddr_t pgd = pagetable[i];
+        paddr_t *pte_table = NULL;
+        u32 j;
+
+        if ( !pgd )
+                       continue;
+
+        pr_mmu(mmu, "pgt[%u][0x%"PRIpaddr"][0x%"PRIpaddr"] pgd[%u] 
0x%"PRIpaddr" (max %lu)",
+               index, pgt->paddr, pgt->maddr, i, pgd, MMU_PTRS_PER_PGD(mmu));
+
+        pte_table = __va(pgd & MMU_SECTION_MASK(mmu->pg_data->pte_shift));
+        if ( !pte_table )
+        {
+            pr_mmu(mmu, "failed to map pagetable");
+            return;
+        }
+
+        for ( j = 0; j < MMU_PTRS_PER_PTE(mmu); j++ )
+        {
+            if ( !pte_table[j] )
+                continue;
+
+            page_counter++;
+            pr_mmu(mmu, "pgt[%u][0x%"PRIpaddr"][0x%"PRIpaddr"] pgd[%u]\t 
pte_table[%u] 0x%"PRIpaddr" (max %lu)",
+                   index, pgt->paddr, pgt->maddr, i, j, pte_table[j], 
MMU_PTRS_PER_PTE(mmu));
+        }
+    }
+    ASSERT(page_counter == pgt->page_counter);
+}
+
+static void mmu_gpu_print_pagetables(struct mmu_info *mmu)
+{
+    struct mmu_pagetable *pgt;
+    u32 i = 0;
+
+    list_for_each_entry(pgt, &mmu->pagetables_list, link_node)
+    {
+        mmu_gpu_print_one_pagetable(mmu, pgt, i++);
+    }
+}
+
 static paddr_t mmu_gpu_translate_pagetable(struct mmu_info *mmu, struct 
mmu_pagetable *pgt)
 {
     /* GPU pagetable consists of set of 32 bit pointers */
-- 
1.9.1


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