From 10ebd8556b7990499c896a550e3d416b444211e6 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 02:23:07 +0000
Subject: [PATCH] add led
---
kernel/drivers/gpu/drm/exynos/exynos_drm_gem.c | 216 ++++++++++++++++++-----------------------------------
1 files changed, 73 insertions(+), 143 deletions(-)
diff --git a/kernel/drivers/gpu/drm/exynos/exynos_drm_gem.c b/kernel/drivers/gpu/drm/exynos/exynos_drm_gem.c
index 34ace85..7777f19 100644
--- a/kernel/drivers/gpu/drm/exynos/exynos_drm_gem.c
+++ b/kernel/drivers/gpu/drm/exynos/exynos_drm_gem.c
@@ -1,40 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/* exynos_drm_gem.c
*
* Copyright (c) 2011 Samsung Electronics Co., Ltd.
* Author: Inki Dae <inki.dae@samsung.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
*/
-#include <drm/drmP.h>
-#include <drm/drm_vma_manager.h>
-#include <linux/shmem_fs.h>
#include <linux/dma-buf.h>
#include <linux/pfn_t.h>
+#include <linux/shmem_fs.h>
+
+#include <drm/drm_prime.h>
+#include <drm/drm_vma_manager.h>
#include <drm/exynos_drm.h>
#include "exynos_drm_drv.h"
#include "exynos_drm_gem.h"
-#include "exynos_drm_iommu.h"
-static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem)
+static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem, bool kvmap)
{
struct drm_device *dev = exynos_gem->base.dev;
- unsigned long attr;
- unsigned int nr_pages;
- struct sg_table sgt;
- int ret = -ENOMEM;
+ unsigned long attr = 0;
if (exynos_gem->dma_addr) {
- DRM_DEBUG_KMS("already allocated.\n");
+ DRM_DEV_DEBUG_KMS(to_dma_dev(dev), "already allocated.\n");
return 0;
}
-
- exynos_gem->dma_attrs = 0;
/*
* if EXYNOS_BO_CONTIG, fully physically contiguous memory
@@ -42,7 +33,7 @@
* as possible.
*/
if (!(exynos_gem->flags & EXYNOS_BO_NONCONTIG))
- exynos_gem->dma_attrs |= DMA_ATTR_FORCE_CONTIGUOUS;
+ attr |= DMA_ATTR_FORCE_CONTIGUOUS;
/*
* if EXYNOS_BO_WC or EXYNOS_BO_NONCACHABLE, writecombine mapping
@@ -50,61 +41,27 @@
*/
if (exynos_gem->flags & EXYNOS_BO_WC ||
!(exynos_gem->flags & EXYNOS_BO_CACHABLE))
- attr = DMA_ATTR_WRITE_COMBINE;
- else
- attr = DMA_ATTR_NON_CONSISTENT;
+ attr |= DMA_ATTR_WRITE_COMBINE;
- exynos_gem->dma_attrs |= attr;
- exynos_gem->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
+ /* FBDev emulation requires kernel mapping */
+ if (!kvmap)
+ attr |= DMA_ATTR_NO_KERNEL_MAPPING;
- nr_pages = exynos_gem->size >> PAGE_SHIFT;
-
- exynos_gem->pages = kvmalloc_array(nr_pages, sizeof(struct page *),
- GFP_KERNEL | __GFP_ZERO);
- if (!exynos_gem->pages) {
- DRM_ERROR("failed to allocate pages.\n");
- return -ENOMEM;
- }
-
+ exynos_gem->dma_attrs = attr;
exynos_gem->cookie = dma_alloc_attrs(to_dma_dev(dev), exynos_gem->size,
&exynos_gem->dma_addr, GFP_KERNEL,
exynos_gem->dma_attrs);
if (!exynos_gem->cookie) {
- DRM_ERROR("failed to allocate buffer.\n");
- goto err_free;
+ DRM_DEV_ERROR(to_dma_dev(dev), "failed to allocate buffer.\n");
+ return -ENOMEM;
}
- ret = dma_get_sgtable_attrs(to_dma_dev(dev), &sgt, exynos_gem->cookie,
- exynos_gem->dma_addr, exynos_gem->size,
- exynos_gem->dma_attrs);
- if (ret < 0) {
- DRM_ERROR("failed to get sgtable.\n");
- goto err_dma_free;
- }
+ if (kvmap)
+ exynos_gem->kvaddr = exynos_gem->cookie;
- if (drm_prime_sg_to_page_addr_arrays(&sgt, exynos_gem->pages, NULL,
- nr_pages)) {
- DRM_ERROR("invalid sgtable.\n");
- ret = -EINVAL;
- goto err_sgt_free;
- }
-
- sg_free_table(&sgt);
-
- DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n",
+ DRM_DEV_DEBUG_KMS(to_dma_dev(dev), "dma_addr(0x%lx), size(0x%lx)\n",
(unsigned long)exynos_gem->dma_addr, exynos_gem->size);
-
return 0;
-
-err_sgt_free:
- sg_free_table(&sgt);
-err_dma_free:
- dma_free_attrs(to_dma_dev(dev), exynos_gem->size, exynos_gem->cookie,
- exynos_gem->dma_addr, exynos_gem->dma_attrs);
-err_free:
- kvfree(exynos_gem->pages);
-
- return ret;
}
static void exynos_drm_free_buf(struct exynos_drm_gem *exynos_gem)
@@ -112,18 +69,16 @@
struct drm_device *dev = exynos_gem->base.dev;
if (!exynos_gem->dma_addr) {
- DRM_DEBUG_KMS("dma_addr is invalid.\n");
+ DRM_DEV_DEBUG_KMS(dev->dev, "dma_addr is invalid.\n");
return;
}
- DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n",
+ DRM_DEV_DEBUG_KMS(dev->dev, "dma_addr(0x%lx), size(0x%lx)\n",
(unsigned long)exynos_gem->dma_addr, exynos_gem->size);
dma_free_attrs(to_dma_dev(dev), exynos_gem->size, exynos_gem->cookie,
(dma_addr_t)exynos_gem->dma_addr,
exynos_gem->dma_attrs);
-
- kvfree(exynos_gem->pages);
}
static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
@@ -140,10 +95,10 @@
if (ret)
return ret;
- DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);
+ DRM_DEV_DEBUG_KMS(to_dma_dev(obj->dev), "gem handle = 0x%x\n", *handle);
/* drop reference from allocate - handle holds it now. */
- drm_gem_object_put_unlocked(obj);
+ drm_gem_object_put(obj);
return 0;
}
@@ -152,7 +107,8 @@
{
struct drm_gem_object *obj = &exynos_gem->base;
- DRM_DEBUG_KMS("handle count = %d\n", obj->handle_count);
+ DRM_DEV_DEBUG_KMS(to_dma_dev(obj->dev), "handle count = %d\n",
+ obj->handle_count);
/*
* do not release memory region from exporter.
@@ -187,7 +143,7 @@
ret = drm_gem_object_init(dev, obj, size);
if (ret < 0) {
- DRM_ERROR("failed to initialize gem object\n");
+ DRM_DEV_ERROR(dev->dev, "failed to initialize gem object\n");
kfree(exynos_gem);
return ERR_PTR(ret);
}
@@ -199,25 +155,27 @@
return ERR_PTR(ret);
}
- DRM_DEBUG_KMS("created file object = %pK\n", obj->filp);
+ DRM_DEV_DEBUG_KMS(dev->dev, "created file object = %pK\n", obj->filp);
return exynos_gem;
}
struct exynos_drm_gem *exynos_drm_gem_create(struct drm_device *dev,
unsigned int flags,
- unsigned long size)
+ unsigned long size,
+ bool kvmap)
{
struct exynos_drm_gem *exynos_gem;
int ret;
if (flags & ~(EXYNOS_BO_MASK)) {
- DRM_ERROR("invalid GEM buffer flags: %u\n", flags);
+ DRM_DEV_ERROR(dev->dev,
+ "invalid GEM buffer flags: %u\n", flags);
return ERR_PTR(-EINVAL);
}
if (!size) {
- DRM_ERROR("invalid GEM buffer size: %lu\n", size);
+ DRM_DEV_ERROR(dev->dev, "invalid GEM buffer size: %lu\n", size);
return ERR_PTR(-EINVAL);
}
@@ -239,7 +197,7 @@
/* set memory type and cache attribute from user side. */
exynos_gem->flags = flags;
- ret = exynos_drm_alloc_buf(exynos_gem);
+ ret = exynos_drm_alloc_buf(exynos_gem, kvmap);
if (ret < 0) {
drm_gem_object_release(&exynos_gem->base);
kfree(exynos_gem);
@@ -256,7 +214,7 @@
struct exynos_drm_gem *exynos_gem;
int ret;
- exynos_gem = exynos_drm_gem_create(dev, args->flags, args->size);
+ exynos_gem = exynos_drm_gem_create(dev, args->flags, args->size, false);
if (IS_ERR(exynos_gem))
return PTR_ERR(exynos_gem);
@@ -326,7 +284,7 @@
obj = drm_gem_object_lookup(file_priv, args->handle);
if (!obj) {
- DRM_ERROR("failed to lookup gem object.\n");
+ DRM_DEV_ERROR(dev->dev, "failed to lookup gem object.\n");
return -EINVAL;
}
@@ -335,7 +293,7 @@
args->flags = exynos_gem->flags;
args->size = exynos_gem->size;
- drm_gem_object_put_unlocked(obj);
+ drm_gem_object_put(obj);
return 0;
}
@@ -367,7 +325,7 @@
else
flags = EXYNOS_BO_CONTIG | EXYNOS_BO_WC;
- exynos_gem = exynos_drm_gem_create(dev, flags, args->size);
+ exynos_gem = exynos_drm_gem_create(dev, flags, args->size, false);
if (IS_ERR(exynos_gem)) {
dev_warn(dev->dev, "FB allocation failed.\n");
return PTR_ERR(exynos_gem);
@@ -383,33 +341,14 @@
return 0;
}
-vm_fault_t exynos_drm_gem_fault(struct vm_fault *vmf)
-{
- struct vm_area_struct *vma = vmf->vma;
- struct drm_gem_object *obj = vma->vm_private_data;
- struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
- unsigned long pfn;
- pgoff_t page_offset;
-
- page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
-
- if (page_offset >= (exynos_gem->size >> PAGE_SHIFT)) {
- DRM_ERROR("invalid page offset\n");
- return VM_FAULT_SIGBUS;
- }
-
- pfn = page_to_pfn(exynos_gem->pages[page_offset]);
- return vmf_insert_mixed(vma, vmf->address,
- __pfn_to_pfn_t(pfn, PFN_DEV));
-}
-
static int exynos_drm_gem_mmap_obj(struct drm_gem_object *obj,
struct vm_area_struct *vma)
{
struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
int ret;
- DRM_DEBUG_KMS("flags = 0x%x\n", exynos_gem->flags);
+ DRM_DEV_DEBUG_KMS(to_dma_dev(obj->dev), "flags = 0x%x\n",
+ exynos_gem->flags);
/* non-cachable as default. */
if (exynos_gem->flags & EXYNOS_BO_CACHABLE)
@@ -463,11 +402,24 @@
struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj)
{
struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
- int npages;
+ struct drm_device *drm_dev = obj->dev;
+ struct sg_table *sgt;
+ int ret;
- npages = exynos_gem->size >> PAGE_SHIFT;
+ sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
+ if (!sgt)
+ return ERR_PTR(-ENOMEM);
- return drm_prime_pages_to_sg(exynos_gem->pages, npages);
+ ret = dma_get_sgtable_attrs(to_dma_dev(drm_dev), sgt, exynos_gem->cookie,
+ exynos_gem->dma_addr, exynos_gem->size,
+ exynos_gem->dma_attrs);
+ if (ret) {
+ DRM_ERROR("failed to get sgtable, %d\n", ret);
+ kfree(sgt);
+ return ERR_PTR(ret);
+ }
+
+ return sgt;
}
struct drm_gem_object *
@@ -476,52 +428,30 @@
struct sg_table *sgt)
{
struct exynos_drm_gem *exynos_gem;
- int npages;
- int ret;
+
+ /* check if the entries in the sg_table are contiguous */
+ if (drm_prime_get_contiguous_size(sgt) < attach->dmabuf->size) {
+ DRM_ERROR("buffer chunks must be mapped contiguously");
+ return ERR_PTR(-EINVAL);
+ }
exynos_gem = exynos_drm_gem_init(dev, attach->dmabuf->size);
- if (IS_ERR(exynos_gem)) {
- ret = PTR_ERR(exynos_gem);
- return ERR_PTR(ret);
- }
+ if (IS_ERR(exynos_gem))
+ return ERR_CAST(exynos_gem);
+
+ /*
+ * Buffer has been mapped as contiguous into DMA address space,
+ * but if there is IOMMU, it can be either CONTIG or NONCONTIG.
+ * We assume a simplified logic below:
+ */
+ if (is_drm_iommu_supported(dev))
+ exynos_gem->flags |= EXYNOS_BO_NONCONTIG;
+ else
+ exynos_gem->flags |= EXYNOS_BO_CONTIG;
exynos_gem->dma_addr = sg_dma_address(sgt->sgl);
-
- npages = exynos_gem->size >> PAGE_SHIFT;
- exynos_gem->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
- if (!exynos_gem->pages) {
- ret = -ENOMEM;
- goto err;
- }
-
- ret = drm_prime_sg_to_page_addr_arrays(sgt, exynos_gem->pages, NULL,
- npages);
- if (ret < 0)
- goto err_free_large;
-
exynos_gem->sgt = sgt;
-
- if (sgt->nents == 1) {
- /* always physically continuous memory if sgt->nents is 1. */
- exynos_gem->flags |= EXYNOS_BO_CONTIG;
- } else {
- /*
- * this case could be CONTIG or NONCONTIG type but for now
- * sets NONCONTIG.
- * TODO. we have to find a way that exporter can notify
- * the type of its own buffer to importer.
- */
- exynos_gem->flags |= EXYNOS_BO_NONCONTIG;
- }
-
return &exynos_gem->base;
-
-err_free_large:
- kvfree(exynos_gem->pages);
-err:
- drm_gem_object_release(&exynos_gem->base);
- kfree(exynos_gem);
- return ERR_PTR(ret);
}
void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj)
--
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