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authorRob Clark <robdclark@gmail.com>2013-11-16 18:56:06 +0100
committerRob Clark <robdclark@gmail.com>2014-01-09 20:38:58 +0100
commit871d812aa43e6350a4edf41bf7cb0879675255f1 (patch)
treea1700a8c806367a0f85b199f620aed2441277b8b /drivers/gpu/drm/msm/msm_iommu.c
parentdrm/msm: fix bus scaling (diff)
downloadlinux-871d812aa43e6350a4edf41bf7cb0879675255f1.tar.xz
linux-871d812aa43e6350a4edf41bf7cb0879675255f1.zip
drm/msm: add support for non-IOMMU systems
Add a VRAM carveout that is used for systems which do not have an IOMMU. The VRAM carveout uses CMA. The arch code must setup a CMA pool for the device (preferrably in highmem.. a 256m-512m VRAM pool in lowmem is not cool). The user can configure the VRAM pool size using msm.vram module param. Technically, the abstraction of IOMMU behind msm_mmu is not strictly needed, but it simplifies the GEM code a bit, and will be useful later when I add support for a2xx devices with GPUMMU, so I decided to keep this part. It appears to be possible to configure the GPU to restrict access to addresses within the VRAM pool, but this is not done yet. So for now the GPU will refuse to load if there is no sort of mmu. Once address based limits are supported and tested to confirm that we aren't giving the GPU access to arbitrary memory, this restriction can be lifted Signed-off-by: Rob Clark <robdclark@gmail.com>
Diffstat (limited to 'drivers/gpu/drm/msm/msm_iommu.c')
-rw-r--r--drivers/gpu/drm/msm/msm_iommu.c148
1 files changed, 148 insertions, 0 deletions
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;
+}