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-rw-r--r--drivers/gpu/drm/msm/Makefile1
-rw-r--r--drivers/gpu/drm/msm/adreno/a3xx_gpu.c15
-rw-r--r--drivers/gpu/drm/msm/adreno/adreno_gpu.c13
-rw-r--r--drivers/gpu/drm/msm/mdp4/mdp4_kms.c29
-rw-r--r--drivers/gpu/drm/msm/msm_drv.c87
-rw-r--r--drivers/gpu/drm/msm/msm_drv.h21
-rw-r--r--drivers/gpu/drm/msm/msm_gem.c170
-rw-r--r--drivers/gpu/drm/msm/msm_gem.h5
-rw-r--r--drivers/gpu/drm/msm/msm_gpu.c19
-rw-r--r--drivers/gpu/drm/msm/msm_gpu.h2
-rw-r--r--drivers/gpu/drm/msm/msm_iommu.c148
-rw-r--r--drivers/gpu/drm/msm/msm_mmu.h47
12 files changed, 410 insertions, 147 deletions
diff --git a/drivers/gpu/drm/msm/Makefile b/drivers/gpu/drm/msm/Makefile
index e5fa12b0d21e..ca62457e0431 100644
--- a/drivers/gpu/drm/msm/Makefile
+++ b/drivers/gpu/drm/msm/Makefile
@@ -24,6 +24,7 @@ msm-y := \
msm_gem_prime.o \
msm_gem_submit.o \
msm_gpu.o \
+ msm_iommu.o \
msm_ringbuffer.o
msm-$(CONFIG_DRM_MSM_FBDEV) += msm_fbdev.o
diff --git a/drivers/gpu/drm/msm/adreno/a3xx_gpu.c b/drivers/gpu/drm/msm/adreno/a3xx_gpu.c
index d9e72a60080c..16fe15d4f571 100644
--- a/drivers/gpu/drm/msm/adreno/a3xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a3xx_gpu.c
@@ -426,7 +426,20 @@ struct msm_gpu *a3xx_gpu_init(struct drm_device *dev)
if (ret)
goto fail;
- return &a3xx_gpu->base.base;
+ if (!gpu->mmu) {
+ /* TODO we think it is possible to configure the GPU to
+ * restrict access to VRAM carveout. But the required
+ * registers are unknown. For now just bail out and
+ * limp along with just modesetting. If it turns out
+ * to not be possible to restrict access, then we must
+ * implement a cmdstream validator.
+ */
+ dev_err(dev->dev, "No memory protection without IOMMU\n");
+ ret = -ENXIO;
+ goto fail;
+ }
+
+ return gpu;
fail:
if (a3xx_gpu)
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index d7bc51b385bf..3f1c7b27e33e 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -17,6 +17,7 @@
#include "adreno_gpu.h"
#include "msm_gem.h"
+#include "msm_mmu.h"
struct adreno_info {
struct adreno_rev rev;
@@ -291,6 +292,7 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
struct adreno_gpu *gpu, const struct adreno_gpu_funcs *funcs,
struct adreno_rev rev)
{
+ struct msm_mmu *mmu;
int i, ret;
/* identify gpu: */
@@ -338,10 +340,13 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
if (ret)
return ret;
- ret = msm_iommu_attach(drm, gpu->base.iommu,
- iommu_ports, ARRAY_SIZE(iommu_ports));
- if (ret)
- return ret;
+ mmu = gpu->base.mmu;
+ if (mmu) {
+ ret = mmu->funcs->attach(mmu, iommu_ports,
+ ARRAY_SIZE(iommu_ports));
+ if (ret)
+ return ret;
+ }
gpu->memptrs_bo = msm_gem_new(drm, sizeof(*gpu->memptrs),
MSM_BO_UNCACHED);
diff --git a/drivers/gpu/drm/msm/mdp4/mdp4_kms.c b/drivers/gpu/drm/msm/mdp4/mdp4_kms.c
index 8972ac35a43d..bab8cbc6d798 100644
--- a/drivers/gpu/drm/msm/mdp4/mdp4_kms.c
+++ b/drivers/gpu/drm/msm/mdp4/mdp4_kms.c
@@ -17,6 +17,7 @@
#include "msm_drv.h"
+#include "msm_mmu.h"
#include "mdp4_kms.h"
static struct mdp4_platform_config *mdp4_get_config(struct platform_device *dev);
@@ -260,6 +261,7 @@ struct msm_kms *mdp4_kms_init(struct drm_device *dev)
struct mdp4_platform_config *config = mdp4_get_config(pdev);
struct mdp4_kms *mdp4_kms;
struct msm_kms *kms = NULL;
+ struct msm_mmu *mmu;
int ret;
mdp4_kms = kzalloc(sizeof(*mdp4_kms), GFP_KERNEL);
@@ -322,12 +324,6 @@ struct msm_kms *mdp4_kms_init(struct drm_device *dev)
clk_set_rate(mdp4_kms->clk, config->max_clk);
clk_set_rate(mdp4_kms->lut_clk, config->max_clk);
- if (!config->iommu) {
- dev_err(dev->dev, "no iommu\n");
- ret = -ENXIO;
- goto fail;
- }
-
/* make sure things are off before attaching iommu (bootloader could
* have left things on, in which case we'll start getting faults if
* we don't disable):
@@ -337,12 +333,23 @@ struct msm_kms *mdp4_kms_init(struct drm_device *dev)
mdp4_write(mdp4_kms, REG_MDP4_DSI_ENABLE, 0);
mdelay(16);
- ret = msm_iommu_attach(dev, config->iommu,
- iommu_ports, ARRAY_SIZE(iommu_ports));
- if (ret)
- goto fail;
+ if (config->iommu) {
+ mmu = msm_iommu_new(dev, config->iommu);
+ if (IS_ERR(mmu)) {
+ ret = PTR_ERR(mmu);
+ goto fail;
+ }
+ ret = mmu->funcs->attach(mmu, iommu_ports,
+ ARRAY_SIZE(iommu_ports));
+ if (ret)
+ goto fail;
+ } else {
+ dev_info(dev->dev, "no iommu, fallback to phys "
+ "contig buffers for scanout\n");
+ mmu = NULL;
+ }
- mdp4_kms->id = msm_register_iommu(dev, config->iommu);
+ mdp4_kms->id = msm_register_mmu(dev, mmu);
if (mdp4_kms->id < 0) {
ret = mdp4_kms->id;
dev_err(dev->dev, "failed to register mdp4 iommu: %d\n", ret);
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 28b57eb6f9a1..a7f0c65ca655 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -30,50 +30,19 @@ static const struct drm_mode_config_funcs mode_config_funcs = {
.output_poll_changed = msm_fb_output_poll_changed,
};
-static int msm_fault_handler(struct iommu_domain *iommu, struct device *dev,
- unsigned long iova, int flags, void *arg)
-{
- DBG("*** fault: iova=%08lx, flags=%d", iova, flags);
- return 0;
-}
-
-int msm_register_iommu(struct drm_device *dev, struct iommu_domain *iommu)
+int msm_register_mmu(struct drm_device *dev, struct msm_mmu *mmu)
{
struct msm_drm_private *priv = dev->dev_private;
- int idx = priv->num_iommus++;
+ int idx = priv->num_mmus++;
- if (WARN_ON(idx >= ARRAY_SIZE(priv->iommus)))
+ if (WARN_ON(idx >= ARRAY_SIZE(priv->mmus)))
return -EINVAL;
- priv->iommus[idx] = iommu;
-
- iommu_set_fault_handler(iommu, msm_fault_handler, dev);
-
- /* need to iommu_attach_device() somewhere?? on resume?? */
+ priv->mmus[idx] = mmu;
return idx;
}
-int msm_iommu_attach(struct drm_device *dev, struct iommu_domain *iommu,
- const char **names, int cnt)
-{
- int i, ret;
-
- for (i = 0; i < cnt; i++) {
- /* TODO maybe some day msm iommu won't require this hack: */
- struct device *msm_iommu_get_ctx(const char *ctx_name);
- struct device *ctx = msm_iommu_get_ctx(names[i]);
- if (!ctx)
- continue;
- ret = iommu_attach_device(iommu, ctx);
- if (ret) {
- dev_warn(dev->dev, "could not attach iommu to %s", names[i]);
- return ret;
- }
- }
- return 0;
-}
-
#ifdef CONFIG_DRM_MSM_REGISTER_LOGGING
static bool reglog = false;
MODULE_PARM_DESC(reglog, "Enable register read/write logging");
@@ -82,6 +51,10 @@ module_param(reglog, bool, 0600);
#define reglog 0
#endif
+static char *vram;
+MODULE_PARM_DESC(vram, "Configure VRAM size (for devices without IOMMU/GPUMMU");
+module_param(vram, charp, 0);
+
void __iomem *msm_ioremap(struct platform_device *pdev, const char *name,
const char *dbgname)
{
@@ -161,6 +134,14 @@ static int msm_unload(struct drm_device *dev)
mutex_unlock(&dev->struct_mutex);
}
+ if (priv->vram.paddr) {
+ DEFINE_DMA_ATTRS(attrs);
+ dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &attrs);
+ drm_mm_takedown(&priv->vram.mm);
+ dma_free_attrs(dev->dev, priv->vram.size, NULL,
+ priv->vram.paddr, &attrs);
+ }
+
dev->dev_private = NULL;
kfree(priv);
@@ -191,6 +172,41 @@ static int msm_load(struct drm_device *dev, unsigned long flags)
drm_mode_config_init(dev);
+ /* if we have no IOMMU, then we need to use carveout allocator.
+ * Grab the entire CMA chunk carved out in early startup in
+ * mach-msm:
+ */
+ if (!iommu_present(&platform_bus_type)) {
+ DEFINE_DMA_ATTRS(attrs);
+ unsigned long size;
+ void *p;
+
+ DBG("using %s VRAM carveout", vram);
+ size = memparse(vram, NULL);
+ priv->vram.size = size;
+
+ drm_mm_init(&priv->vram.mm, 0, (size >> PAGE_SHIFT) - 1);
+
+ dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &attrs);
+ dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
+
+ /* note that for no-kernel-mapping, the vaddr returned
+ * is bogus, but non-null if allocation succeeded:
+ */
+ p = dma_alloc_attrs(dev->dev, size,
+ &priv->vram.paddr, 0, &attrs);
+ if (!p) {
+ dev_err(dev->dev, "failed to allocate VRAM\n");
+ priv->vram.paddr = 0;
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ dev_info(dev->dev, "VRAM: %08x->%08x\n",
+ (uint32_t)priv->vram.paddr,
+ (uint32_t)(priv->vram.paddr + size));
+ }
+
kms = mdp4_kms_init(dev);
if (IS_ERR(kms)) {
/*
@@ -778,6 +794,7 @@ static const struct dev_pm_ops msm_pm_ops = {
static int msm_pdev_probe(struct platform_device *pdev)
{
+ pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
return drm_platform_init(&msm_driver, pdev);
}
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index a4c52cfe7fca..1d22d87a49fb 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -53,6 +53,7 @@ static inline struct device *msm_iommu_get_ctx(const char *ctx_name)
struct msm_kms;
struct msm_gpu;
+struct msm_mmu;
#define NUM_DOMAINS 2 /* one for KMS, then one per gpu core (?) */
@@ -85,9 +86,9 @@ struct msm_drm_private {
/* callbacks deferred until bo is inactive: */
struct list_head fence_cbs;
- /* registered IOMMU domains: */
- unsigned int num_iommus;
- struct iommu_domain *iommus[NUM_DOMAINS];
+ /* registered MMUs: */
+ unsigned int num_mmus;
+ struct msm_mmu *mmus[NUM_DOMAINS];
unsigned int num_planes;
struct drm_plane *planes[8];
@@ -103,6 +104,16 @@ struct msm_drm_private {
unsigned int num_connectors;
struct drm_connector *connectors[8];
+
+ /* VRAM carveout, used when no IOMMU: */
+ struct {
+ unsigned long size;
+ dma_addr_t paddr;
+ /* NOTE: mm managed at the page level, size is in # of pages
+ * and position mm_node->start is in # of pages:
+ */
+ struct drm_mm mm;
+ } vram;
};
struct msm_format {
@@ -153,9 +164,7 @@ struct msm_kms {
struct msm_kms *mdp4_kms_init(struct drm_device *dev);
-int msm_register_iommu(struct drm_device *dev, struct iommu_domain *iommu);
-int msm_iommu_attach(struct drm_device *dev, struct iommu_domain *iommu,
- const char **names, int cnt);
+int msm_register_mmu(struct drm_device *dev, struct msm_mmu *mmu);
int msm_wait_fence_interruptable(struct drm_device *dev, uint32_t fence,
struct timespec *timeout);
diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index e587d251c590..d8d60c969ac7 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -22,7 +22,45 @@
#include "msm_drv.h"
#include "msm_gem.h"
#include "msm_gpu.h"
+#include "msm_mmu.h"
+static dma_addr_t physaddr(struct drm_gem_object *obj)
+{
+ struct msm_gem_object *msm_obj = to_msm_bo(obj);
+ struct msm_drm_private *priv = obj->dev->dev_private;
+ return (((dma_addr_t)msm_obj->vram_node->start) << PAGE_SHIFT) +
+ priv->vram.paddr;
+}
+
+/* allocate pages from VRAM carveout, used when no IOMMU: */
+static struct page **get_pages_vram(struct drm_gem_object *obj,
+ int npages)
+{
+ struct msm_gem_object *msm_obj = to_msm_bo(obj);
+ struct msm_drm_private *priv = obj->dev->dev_private;
+ dma_addr_t paddr;
+ struct page **p;
+ int ret, i;
+
+ p = drm_malloc_ab(npages, sizeof(struct page *));
+ if (!p)
+ return ERR_PTR(-ENOMEM);
+
+ ret = drm_mm_insert_node(&priv->vram.mm, msm_obj->vram_node,
+ npages, 0, DRM_MM_SEARCH_DEFAULT);
+ if (ret) {
+ drm_free_large(p);
+ return ERR_PTR(ret);
+ }
+
+ paddr = physaddr(obj);
+ for (i = 0; i < npages; i++) {
+ p[i] = phys_to_page(paddr);
+ paddr += PAGE_SIZE;
+ }
+
+ return p;
+}
/* called with dev->struct_mutex held */
static struct page **get_pages(struct drm_gem_object *obj)
@@ -31,9 +69,14 @@ static struct page **get_pages(struct drm_gem_object *obj)
if (!msm_obj->pages) {
struct drm_device *dev = obj->dev;
- struct page **p = drm_gem_get_pages(obj, 0);
+ struct page **p;
int npages = obj->size >> PAGE_SHIFT;
+ if (iommu_present(&platform_bus_type))
+ p = drm_gem_get_pages(obj, 0);
+ else
+ p = get_pages_vram(obj, npages);
+
if (IS_ERR(p)) {
dev_err(dev->dev, "could not get pages: %ld\n",
PTR_ERR(p));
@@ -73,7 +116,11 @@ static void put_pages(struct drm_gem_object *obj)
sg_free_table(msm_obj->sgt);
kfree(msm_obj->sgt);
- drm_gem_put_pages(obj, msm_obj->pages, true, false);
+ if (iommu_present(&platform_bus_type))
+ drm_gem_put_pages(obj, msm_obj->pages, true, false);
+ else
+ drm_mm_remove_node(msm_obj->vram_node);
+
msm_obj->pages = NULL;
}
}
@@ -138,7 +185,6 @@ int msm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
int msm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct drm_gem_object *obj = vma->vm_private_data;
- struct msm_gem_object *msm_obj = to_msm_bo(obj);
struct drm_device *dev = obj->dev;
struct page **pages;
unsigned long pfn;
@@ -163,7 +209,7 @@ int msm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
pgoff = ((unsigned long)vmf->virtual_address -
vma->vm_start) >> PAGE_SHIFT;
- pfn = page_to_pfn(msm_obj->pages[pgoff]);
+ pfn = page_to_pfn(pages[pgoff]);
VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address,
pfn, pfn << PAGE_SHIFT);
@@ -219,67 +265,6 @@ uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj)
return offset;
}
-/* helpers for dealing w/ iommu: */
-static int map_range(struct iommu_domain *domain, unsigned int iova,
- struct sg_table *sgt, unsigned int len, int prot)
-{
- struct scatterlist *sg;
- unsigned int da = iova;
- unsigned int i, j;
- int ret;
-
- if (!domain || !sgt)
- return -EINVAL;
-
- for_each_sg(sgt->sgl, sg, sgt->nents, i) {
- u32 pa = sg_phys(sg) - sg->offset;
- size_t bytes = sg->length + sg->offset;
-
- VERB("map[%d]: %08x %08x(%x)", i, iova, pa, bytes);
-
- ret = iommu_map(domain, da, pa, bytes, prot);
- if (ret)
- goto fail;
-
- da += bytes;
- }
-
- return 0;
-
-fail:
- da = iova;
-
- for_each_sg(sgt->sgl, sg, i, j) {
- size_t bytes = sg->length + sg->offset;
- iommu_unmap(domain, da, bytes);
- da += bytes;
- }
- return ret;
-}
-
-static void unmap_range(struct iommu_domain *domain, unsigned int iova,
- struct sg_table *sgt, unsigned int len)
-{
- struct scatterlist *sg;
- unsigned int da = iova;
- int i;
-
- for_each_sg(sgt->sgl, sg, sgt->nents, i) {
- size_t bytes = sg->length + sg->offset;
- size_t unmapped;
-
- unmapped = iommu_unmap(domain, da, bytes);
- if (unmapped < bytes)
- break;
-
- VERB("unmap[%d]: %08x(%x)", i, iova, bytes);
-
- BUG_ON(!IS_ALIGNED(bytes, PAGE_SIZE));
-
- da += bytes;
- }
-}
-
/* should be called under struct_mutex.. although it can be called
* from atomic context without struct_mutex to acquire an extra
* iova ref if you know one is already held.
@@ -295,15 +280,20 @@ int msm_gem_get_iova_locked(struct drm_gem_object *obj, int id,
if (!msm_obj->domain[id].iova) {
struct msm_drm_private *priv = obj->dev->dev_private;
- uint32_t offset = (uint32_t)mmap_offset(obj);
- struct page **pages;
- pages = get_pages(obj);
+ struct msm_mmu *mmu = priv->mmus[id];
+ struct page **pages = get_pages(obj);
+
if (IS_ERR(pages))
return PTR_ERR(pages);
- // XXX ideally we would not map buffers writable when not needed...
- ret = map_range(priv->iommus[id], offset, msm_obj->sgt,
- obj->size, IOMMU_READ | IOMMU_WRITE);
- msm_obj->domain[id].iova = offset;
+
+ if (iommu_present(&platform_bus_type)) {
+ uint32_t offset = (uint32_t)mmap_offset(obj);
+ ret = mmu->funcs->map(mmu, offset, msm_obj->sgt,
+ obj->size, IOMMU_READ | IOMMU_WRITE);
+ msm_obj->domain[id].iova = offset;
+ } else {
+ msm_obj->domain[id].iova = physaddr(obj);
+ }
}
if (!ret)
@@ -514,6 +504,7 @@ void msm_gem_describe_objects(struct list_head *list, struct seq_file *m)
void msm_gem_free_object(struct drm_gem_object *obj)
{
struct drm_device *dev = obj->dev;
+ struct msm_drm_private *priv = obj->dev->dev_private;
struct msm_gem_object *msm_obj = to_msm_bo(obj);
int id;
@@ -525,11 +516,10 @@ void msm_gem_free_object(struct drm_gem_object *obj)
list_del(&msm_obj->mm_list);
for (id = 0; id < ARRAY_SIZE(msm_obj->domain); id++) {
- if (msm_obj->domain[id].iova) {
- struct msm_drm_private *priv = obj->dev->dev_private;
+ struct msm_mmu *mmu = priv->mmus[id];
+ if (mmu && msm_obj->domain[id].iova) {
uint32_t offset = (uint32_t)mmap_offset(obj);
- unmap_range(priv->iommus[id], offset,
- msm_obj->sgt, obj->size);
+ mmu->funcs->unmap(mmu, offset, msm_obj->sgt, obj->size);
}
}
@@ -591,6 +581,7 @@ static int msm_gem_new_impl(struct drm_device *dev,
{
struct msm_drm_private *priv = dev->dev_private;
struct msm_gem_object *msm_obj;
+ unsigned sz;
switch (flags & MSM_BO_CACHE_MASK) {
case MSM_BO_UNCACHED:
@@ -603,10 +594,17 @@ static int msm_gem_new_impl(struct drm_device *dev,
return -EINVAL;
}
- msm_obj = kzalloc(sizeof(*msm_obj), GFP_KERNEL);
+ sz = sizeof(*msm_obj);
+ if (!iommu_present(&platform_bus_type))
+ sz += sizeof(struct drm_mm_node);
+
+ msm_obj = kzalloc(sz, GFP_KERNEL);
if (!msm_obj)
return -ENOMEM;
+ if (!iommu_present(&platform_bus_type))
+ msm_obj->vram_node = (void *)&msm_obj[1];
+
msm_obj->flags = flags;
msm_obj->resv = &msm_obj->_resv;
@@ -623,7 +621,7 @@ static int msm_gem_new_impl(struct drm_device *dev,
struct drm_gem_object *msm_gem_new(struct drm_device *dev,
uint32_t size, uint32_t flags)
{
- struct drm_gem_object *obj;
+ struct drm_gem_object *obj = NULL;
int ret;
WARN_ON(!mutex_is_locked(&dev->struct_mutex));
@@ -634,9 +632,13 @@ struct drm_gem_object *msm_gem_new(struct drm_device *dev,
if (ret)
goto fail;
- ret = drm_gem_object_init(dev, obj, size);
- if (ret)
- goto fail;
+ if (iommu_present(&platform_bus_type)) {
+ ret = drm_gem_object_init(dev, obj, size);
+ if (ret)
+ goto fail;
+ } else {
+ drm_gem_private_object_init(dev, obj, size);
+ }
return obj;
@@ -654,6 +656,12 @@ struct drm_gem_object *msm_gem_import(struct drm_device *dev,
struct drm_gem_object *obj;
int ret, npages;
+ /* if we don't have IOMMU, don't bother pretending we can import: */
+ if (!iommu_present(&platform_bus_type)) {
+ dev_err(dev->dev, "cannot import without IOMMU\n");
+ return ERR_PTR(-EINVAL);
+ }
+
size = PAGE_ALIGN(size);
ret = msm_gem_new_impl(dev, size, MSM_BO_WC, &obj);
diff --git a/drivers/gpu/drm/msm/msm_gem.h b/drivers/gpu/drm/msm/msm_gem.h
index f4f23a578d9d..3246bb46c4f2 100644
--- a/drivers/gpu/drm/msm/msm_gem.h
+++ b/drivers/gpu/drm/msm/msm_gem.h
@@ -57,6 +57,11 @@ struct msm_gem_object {
/* normally (resv == &_resv) except for imported bo's */
struct reservation_object *resv;
struct reservation_object _resv;
+
+ /* For physically contiguous buffers. Used when we don't have
+ * an IOMMU.
+ */
+ struct drm_mm_node *vram_node;
};
#define to_msm_bo(x) container_of(x, struct msm_gem_object, base)
diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index 71f105f0d897..4ebce8be489d 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -17,6 +17,7 @@
#include "msm_gpu.h"
#include "msm_gem.h"
+#include "msm_mmu.h"
/*
@@ -353,6 +354,7 @@ int msm_gpu_init(struct drm_device *drm, struct platform_device *pdev,
struct msm_gpu *gpu, const struct msm_gpu_funcs *funcs,
const char *name, const char *ioname, const char *irqname, int ringsz)
{
+ struct iommu_domain *iommu;
int i, ret;
gpu->dev = drm;
@@ -418,13 +420,14 @@ int msm_gpu_init(struct drm_device *drm, struct platform_device *pdev,
* and have separate page tables per context. For now, to keep things
* simple and to get something working, just use a single address space:
*/
- gpu->iommu = iommu_domain_alloc(&platform_bus_type);
- if (!gpu->iommu) {
- dev_err(drm->dev, "failed to allocate IOMMU\n");
- ret = -ENOMEM;
- goto fail;
+ iommu = iommu_domain_alloc(&platform_bus_type);
+ if (iommu) {
+ dev_info(drm->dev, "%s: using IOMMU\n", name);
+ gpu->mmu = msm_iommu_new(drm, iommu);
+ } else {
+ dev_info(drm->dev, "%s: no IOMMU, fallback to VRAM carveout!\n", name);
}
- gpu->id = msm_register_iommu(drm, gpu->iommu);
+ gpu->id = msm_register_mmu(drm, gpu->mmu);
/* Create ringbuffer: */
gpu->rb = msm_ringbuffer_new(gpu, ringsz);
@@ -464,6 +467,6 @@ void msm_gpu_cleanup(struct msm_gpu *gpu)
msm_ringbuffer_destroy(gpu->rb);
}
- if (gpu->iommu)
- iommu_domain_free(gpu->iommu);
+ if (gpu->mmu)
+ gpu->mmu->funcs->destroy(gpu->mmu);
}
diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
index 08d08420cbcc..458db8c64c28 100644
--- a/drivers/gpu/drm/msm/msm_gpu.h
+++ b/drivers/gpu/drm/msm/msm_gpu.h
@@ -78,7 +78,7 @@ struct msm_gpu {
void __iomem *mmio;
int irq;
- struct iommu_domain *iommu;
+ struct msm_mmu *mmu;
int id;
/* Power Control: */
diff --git a/drivers/gpu/drm/msm/msm_iommu.c b/drivers/gpu/drm/msm/msm_iommu.c
new file mode 100644
index 000000000000..014a3fd04f62
--- /dev/null
+++ b/drivers/gpu/drm/msm/msm_iommu.c
@@ -0,0 +1,148 @@
+/*
+ * Copyright (C) 2013 Red Hat
+ * Author: Rob Clark <robdclark@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "msm_drv.h"
+#include "msm_mmu.h"
+
+struct msm_iommu {
+ struct msm_mmu base;
+ struct iommu_domain *domain;
+};
+#define to_msm_iommu(x) container_of(x, struct msm_iommu, base)
+
+static int msm_fault_handler(struct iommu_domain *iommu, struct device *dev,
+ unsigned long iova, int flags, void *arg)
+{
+ DBG("*** fault: iova=%08lx, flags=%d", iova, flags);
+ return 0;
+}
+
+static int msm_iommu_attach(struct msm_mmu *mmu, const char **names, int cnt)
+{
+ struct drm_device *dev = mmu->dev;
+ struct msm_iommu *iommu = to_msm_iommu(mmu);
+ int i, ret;
+
+ for (i = 0; i < cnt; i++) {
+ struct device *msm_iommu_get_ctx(const char *ctx_name);
+ struct device *ctx = msm_iommu_get_ctx(names[i]);
+ if (!ctx)
+ continue;
+ ret = iommu_attach_device(iommu->domain, ctx);
+ if (ret) {
+ dev_warn(dev->dev, "could not attach iommu to %s", names[i]);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int msm_iommu_map(struct msm_mmu *mmu, uint32_t iova,
+ struct sg_table *sgt, unsigned len, int prot)
+{
+ struct msm_iommu *iommu = to_msm_iommu(mmu);
+ struct iommu_domain *domain = iommu->domain;
+ struct scatterlist *sg;
+ unsigned int da = iova;
+ unsigned int i, j;
+ int ret;
+
+ if (!domain || !sgt)
+ return -EINVAL;
+
+ for_each_sg(sgt->sgl, sg, sgt->nents, i) {
+ u32 pa = sg_phys(sg) - sg->offset;
+ size_t bytes = sg->length + sg->offset;
+
+ VERB("map[%d]: %08x %08x(%x)", i, iova, pa, bytes);
+
+ ret = iommu_map(domain, da, pa, bytes, prot);
+ if (ret)
+ goto fail;
+
+ da += bytes;
+ }
+
+ return 0;
+
+fail:
+ da = iova;
+
+ for_each_sg(sgt->sgl, sg, i, j) {
+ size_t bytes = sg->length + sg->offset;
+ iommu_unmap(domain, da, bytes);
+ da += bytes;
+ }
+ return ret;
+}
+
+static int msm_iommu_unmap(struct msm_mmu *mmu, uint32_t iova,
+ struct sg_table *sgt, unsigned len)
+{
+ struct msm_iommu *iommu = to_msm_iommu(mmu);
+ struct iommu_domain *domain = iommu->domain;
+ struct scatterlist *sg;
+ unsigned int da = iova;
+ int i;
+
+ for_each_sg(sgt->sgl, sg, sgt->nents, i) {
+ size_t bytes = sg->length + sg->offset;
+ size_t unmapped;
+
+ unmapped = iommu_unmap(domain, da, bytes);
+ if (unmapped < bytes)
+ return unmapped;
+
+ VERB("unmap[%d]: %08x(%x)", i, iova, bytes);
+
+ BUG_ON(!IS_ALIGNED(bytes, PAGE_SIZE));
+
+ da += bytes;
+ }
+
+ return 0;
+}
+
+static void msm_iommu_destroy(struct msm_mmu *mmu)
+{
+ struct msm_iommu *iommu = to_msm_iommu(mmu);
+ iommu_domain_free(iommu->domain);
+ kfree(iommu);
+}
+
+static const struct msm_mmu_funcs funcs = {
+ .attach = msm_iommu_attach,
+ .map = msm_iommu_map,
+ .unmap = msm_iommu_unmap,
+ .destroy = msm_iommu_destroy,
+};
+
+struct msm_mmu *msm_iommu_new(struct drm_device *dev, struct iommu_domain *domain)
+{
+ struct msm_iommu *iommu;
+
+ iommu = kzalloc(sizeof(*iommu), GFP_KERNEL);
+ if (!iommu)
+ return ERR_PTR(-ENOMEM);
+
+ iommu->domain = domain;
+ msm_mmu_init(&iommu->base, dev, &funcs);
+ iommu_set_fault_handler(domain, msm_fault_handler, dev);
+
+ return &iommu->base;
+}
diff --git a/drivers/gpu/drm/msm/msm_mmu.h b/drivers/gpu/drm/msm/msm_mmu.h
new file mode 100644
index 000000000000..030324482b4a
--- /dev/null
+++ b/drivers/gpu/drm/msm/msm_mmu.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2013 Red Hat
+ * Author: Rob Clark <robdclark@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __MSM_MMU_H__
+#define __MSM_MMU_H__
+
+#include <linux/iommu.h>
+
+struct msm_mmu_funcs {
+ int (*attach)(struct msm_mmu *mmu, const char **names, int cnt);
+ int (*map)(struct msm_mmu *mmu, uint32_t iova, struct sg_table *sgt,
+ unsigned len, int prot);
+ int (*unmap)(struct msm_mmu *mmu, uint32_t iova, struct sg_table *sgt,
+ unsigned len);
+ void (*destroy)(struct msm_mmu *mmu);
+};
+
+struct msm_mmu {
+ const struct msm_mmu_funcs *funcs;
+ struct drm_device *dev;
+};
+
+static inline void msm_mmu_init(struct msm_mmu *mmu, struct drm_device *dev,
+ const struct msm_mmu_funcs *funcs)
+{
+ mmu->dev = dev;
+ mmu->funcs = funcs;
+}
+
+struct msm_mmu *msm_iommu_new(struct drm_device *dev, struct iommu_domain *domain);
+struct msm_mmu *msm_gpummu_new(struct drm_device *dev, struct msm_gpu *gpu);
+
+#endif /* __MSM_MMU_H__ */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-04 15:43:51 +0000