[PATCH v11 00/12] iommu/arm-smmu: Add Adreno SMMU specific implementation

[PATCH v11 00/12] iommu/arm-smmu: Add Adreno SMMU specific implementation

[Jordan Crouse]

This series adds an Adreno SMMU implementation to arm-smmu to allow GPU hardware
pagetable switching.

The Adreno GPU has built in capabilities to switch the TTBR0 pagetable during
runtime to allow each individual instance or application to have its own
pagetable.  In order to take advantage of the HW capabilities there are certain
requirements needed of the SMMU hardware.

This series adds support for an Adreno specific arm-smmu implementation. The new
implementation 1) ensures that the GPU domain is always assigned context bank 0,
2) enables split pagetable support (TTBR1) so that the instance specific
pagetable can be swapped while the global memory remains in place and 3) shares
the current pagetable configuration with the GPU driver to allow it to create
its own io-pgtable instances.

The series then adds the drm/msm code to enable these features. For targets that
support it allocate new pagetables using the io-pgtable configuration shared by
the arm-smmu driver and swap them in during runtime.

This version of the series merges the previous patchset(s) [1] and [2]
with the following improvements:

v11:
  - Add implementation specific get_attr/set_attr functions (per Rob Clark)
  - Fix context bank allocation (per Bjorn Andersson)
v10:
  - arm-smmu: add implementation hook to allocate context banks
  - arm-smmu: Match the GPU domain by stream ID instead of compatible string
  - arm-smmu: Make DOMAIN_ATTR_PGTABLE_CFG bi-directional. The leaf driver
    queries the configuration to create a pagetable and then sends the newly
    created configuration back to the smmu-driver to enable TTBR0
  - drm/msm: Add context reference counting for submissions
  - drm/msm: Use dummy functions to skip TLB operations on per-instance
    pagetables

[1] https://lists.linuxfoundation.org/pipermail/iommu/2020-June/045653.html
[2] https://lists.linuxfoundation.org/pipermail/iommu/2020-June/045659.html


Jordan Crouse (12):
  iommu/arm-smmu: Pass io-pgtable config to implementation specific
    function
  iommu/arm-smmu: Add support for split pagetables
  iommu/arm-smmu: Prepare for the adreno-smmu implementation
  iommu: Add a domain attribute to get/set a pagetable configuration
  iommu/arm-smmu-qcom: Add implementation for the adreno GPU SMMU
  dt-bindings: arm-smmu: Add compatible string for Adreno GPU SMMU
  drm/msm: Add a context pointer to the submitqueue
  drm/msm: Set the global virtual address range from the IOMMU domain
  drm/msm: Add support to create a local pagetable
  drm/msm: Add support for private address space instances
  drm/msm/a6xx: Add support for per-instance pagetables
  arm: dts: qcom: sm845: Set the compatible string for the GPU SMMU

 .../devicetree/bindings/iommu/arm,smmu.yaml   |   4 +
 arch/arm64/boot/dts/qcom/sdm845.dtsi          |   2 +-
 drivers/gpu/drm/msm/adreno/a5xx_gpu.c         |  12 +-
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c         |  58 ++++-
 drivers/gpu/drm/msm/adreno/a6xx_gpu.h         |   1 +
 drivers/gpu/drm/msm/adreno/adreno_gpu.c       |  18 +-
 drivers/gpu/drm/msm/adreno/adreno_gpu.h       |   3 +-
 drivers/gpu/drm/msm/msm_drv.c                 |  16 +-
 drivers/gpu/drm/msm/msm_drv.h                 |  13 ++
 drivers/gpu/drm/msm/msm_gem.h                 |   1 +
 drivers/gpu/drm/msm/msm_gem_submit.c          |   8 +-
 drivers/gpu/drm/msm/msm_gem_vma.c             |   9 +
 drivers/gpu/drm/msm/msm_gpu.c                 |  26 ++-
 drivers/gpu/drm/msm/msm_gpu.h                 |  12 +-
 drivers/gpu/drm/msm/msm_gpummu.c              |   2 +-
 drivers/gpu/drm/msm/msm_iommu.c               | 198 +++++++++++++++++-
 drivers/gpu/drm/msm/msm_mmu.h                 |  16 +-
 drivers/gpu/drm/msm/msm_ringbuffer.h          |   1 +
 drivers/gpu/drm/msm/msm_submitqueue.c         |   8 +-
 drivers/iommu/arm/arm-smmu/arm-smmu-impl.c    |   6 +-
 drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c    | 156 +++++++++++++-
 drivers/iommu/arm/arm-smmu/arm-smmu.c         | 113 +++++-----
 drivers/iommu/arm/arm-smmu/arm-smmu.h         |  82 +++++++-
 include/linux/iommu.h                         |   1 +
 24 files changed, 653 insertions(+), 113 deletions(-)

-- 
2.25.1

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[PATCH v11 07/12] drm/msm: Add a context pointer to the submitqueue

[Jordan Crouse]

Each submitqueue is attached to a context. Add a pointer to the
context to the submitqueue at create time and refcount it so
that it stays around through the life of the queue.

GPU submissions can access the active context via the submitqueue
instead of requiring it to be passed around from function to
function.

Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
---

 drivers/gpu/drm/msm/adreno/a5xx_gpu.c   | 12 +++++-------
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c   |  5 ++---
 drivers/gpu/drm/msm/adreno/adreno_gpu.c |  5 ++---
 drivers/gpu/drm/msm/adreno/adreno_gpu.h |  3 +--
 drivers/gpu/drm/msm/msm_drv.c           |  3 ++-
 drivers/gpu/drm/msm/msm_drv.h           |  8 ++++++++
 drivers/gpu/drm/msm/msm_gem.h           |  1 +
 drivers/gpu/drm/msm/msm_gem_submit.c    |  8 ++++----
 drivers/gpu/drm/msm/msm_gpu.c           |  9 ++++-----
 drivers/gpu/drm/msm/msm_gpu.h           |  7 +++----
 drivers/gpu/drm/msm/msm_submitqueue.c   |  8 +++++++-
 11 files changed, 39 insertions(+), 30 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
index 9e63a190642c..eff2439ea57b 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
@@ -43,8 +43,7 @@ static void a5xx_flush(struct msm_gpu *gpu, struct msm_ringbuffer *ring)
 		gpu_write(gpu, REG_A5XX_CP_RB_WPTR, wptr);
 }
 
-static void a5xx_submit_in_rb(struct msm_gpu *gpu, struct msm_gem_submit *submit,
-	struct msm_file_private *ctx)
+static void a5xx_submit_in_rb(struct msm_gpu *gpu, struct msm_gem_submit *submit)
 {
 	struct msm_drm_private *priv = gpu->dev->dev_private;
 	struct msm_ringbuffer *ring = submit->ring;
@@ -57,7 +56,7 @@ static void a5xx_submit_in_rb(struct msm_gpu *gpu, struct msm_gem_submit *submit
 		case MSM_SUBMIT_CMD_IB_TARGET_BUF:
 			break;
 		case MSM_SUBMIT_CMD_CTX_RESTORE_BUF:
-			if (priv->lastctx == ctx)
+			if (priv->lastctx == submit->queue->ctx)
 				break;
 			/* fall-thru */
 		case MSM_SUBMIT_CMD_BUF:
@@ -103,8 +102,7 @@ static void a5xx_submit_in_rb(struct msm_gpu *gpu, struct msm_gem_submit *submit
 	msm_gpu_retire(gpu);
 }
 
-static void a5xx_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
-	struct msm_file_private *ctx)
+static void a5xx_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit)
 {
 	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
 	struct a5xx_gpu *a5xx_gpu = to_a5xx_gpu(adreno_gpu);
@@ -114,7 +112,7 @@ static void a5xx_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
 
 	if (IS_ENABLED(CONFIG_DRM_MSM_GPU_SUDO) && submit->in_rb) {
 		priv->lastctx = NULL;
-		a5xx_submit_in_rb(gpu, submit, ctx);
+		a5xx_submit_in_rb(gpu, submit);
 		return;
 	}
 
@@ -148,7 +146,7 @@ static void a5xx_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
 		case MSM_SUBMIT_CMD_IB_TARGET_BUF:
 			break;
 		case MSM_SUBMIT_CMD_CTX_RESTORE_BUF:
-			if (priv->lastctx == ctx)
+			if (priv->lastctx == submit->queue->ctx)
 				break;
 			/* fall-thru */
 		case MSM_SUBMIT_CMD_BUF:
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index c5a3e4d4c007..5eabb0109577 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -81,8 +81,7 @@ static void get_stats_counter(struct msm_ringbuffer *ring, u32 counter,
 	OUT_RING(ring, upper_32_bits(iova));
 }
 
-static void a6xx_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
-	struct msm_file_private *ctx)
+static void a6xx_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit)
 {
 	unsigned int index = submit->seqno % MSM_GPU_SUBMIT_STATS_COUNT;
 	struct msm_drm_private *priv = gpu->dev->dev_private;
@@ -115,7 +114,7 @@ static void a6xx_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
 		case MSM_SUBMIT_CMD_IB_TARGET_BUF:
 			break;
 		case MSM_SUBMIT_CMD_CTX_RESTORE_BUF:
-			if (priv->lastctx == ctx)
+			if (priv->lastctx == submit->queue->ctx)
 				break;
 			/* fall-thru */
 		case MSM_SUBMIT_CMD_BUF:
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index e23641a5ec84..b38a8126541a 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -457,8 +457,7 @@ void adreno_recover(struct msm_gpu *gpu)
 	}
 }
 
-void adreno_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
-		struct msm_file_private *ctx)
+void adreno_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit)
 {
 	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
 	struct msm_drm_private *priv = gpu->dev->dev_private;
@@ -472,7 +471,7 @@ void adreno_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
 			break;
 		case MSM_SUBMIT_CMD_CTX_RESTORE_BUF:
 			/* ignore if there has not been a ctx switch: */
-			if (priv->lastctx == ctx)
+			if (priv->lastctx == submit->queue->ctx)
 				break;
 			/* fall-thru */
 		case MSM_SUBMIT_CMD_BUF:
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.h b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
index 99bb468f5f24..0ae8b373c428 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.h
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
@@ -267,8 +267,7 @@ struct drm_gem_object *adreno_fw_create_bo(struct msm_gpu *gpu,
 		const struct firmware *fw, u64 *iova);
 int adreno_hw_init(struct msm_gpu *gpu);
 void adreno_recover(struct msm_gpu *gpu);
-void adreno_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
-		struct msm_file_private *ctx);
+void adreno_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit);
 void adreno_flush(struct msm_gpu *gpu, struct msm_ringbuffer *ring);
 bool adreno_idle(struct msm_gpu *gpu, struct msm_ringbuffer *ring);
 #if defined(CONFIG_DEBUG_FS) || defined(CONFIG_DEV_COREDUMP)
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 7d641c7e3514..108b663c3ef2 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -594,6 +594,7 @@ static int context_init(struct drm_device *dev, struct drm_file *file)
 	if (!ctx)
 		return -ENOMEM;
 
+	kref_init(&ctx->ref);
 	msm_submitqueue_init(dev, ctx);
 
 	ctx->aspace = priv->gpu ? priv->gpu->aspace : NULL;
@@ -615,7 +616,7 @@ static int msm_open(struct drm_device *dev, struct drm_file *file)
 static void context_close(struct msm_file_private *ctx)
 {
 	msm_submitqueue_close(ctx);
-	kfree(ctx);
+	kref_put(&ctx->ref, msm_file_private_destroy);
 }
 
 static void msm_postclose(struct drm_device *dev, struct drm_file *file)
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index af259b0573ea..f69c6d62584d 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -57,6 +57,7 @@ struct msm_file_private {
 	struct list_head submitqueues;
 	int queueid;
 	struct msm_gem_address_space *aspace;
+	struct kref ref;
 };
 
 enum msm_mdp_plane_property {
@@ -428,6 +429,13 @@ void msm_submitqueue_close(struct msm_file_private *ctx);
 
 void msm_submitqueue_destroy(struct kref *kref);
 
+static inline void msm_file_private_destroy(struct kref *kref)
+{
+	struct msm_file_private *ctx = container_of(kref,
+		struct msm_file_private, ref);
+
+	kfree(ctx);
+}
 
 #define DBG(fmt, ...) DRM_DEBUG_DRIVER(fmt"\n", ##__VA_ARGS__)
 #define VERB(fmt, ...) if (0) DRM_DEBUG_DRIVER(fmt"\n", ##__VA_ARGS__)
diff --git a/drivers/gpu/drm/msm/msm_gem.h b/drivers/gpu/drm/msm/msm_gem.h
index 972490b14ba5..9c573c4269cb 100644
--- a/drivers/gpu/drm/msm/msm_gem.h
+++ b/drivers/gpu/drm/msm/msm_gem.h
@@ -142,6 +142,7 @@ struct msm_gem_submit {
 	bool valid;         /* true if no cmdstream patching needed */
 	bool in_rb;         /* "sudo" mode, copy cmds into RB */
 	struct msm_ringbuffer *ring;
+	struct msm_file_private *ctx;
 	unsigned int nr_cmds;
 	unsigned int nr_bos;
 	u32 ident;	   /* A "identifier" for the submit for logging */
diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c
index 8cb9aa15ff90..aa5c60a7132d 100644
--- a/drivers/gpu/drm/msm/msm_gem_submit.c
+++ b/drivers/gpu/drm/msm/msm_gem_submit.c
@@ -27,7 +27,7 @@
 #define BO_PINNED   0x2000
 
 static struct msm_gem_submit *submit_create(struct drm_device *dev,
-		struct msm_gpu *gpu, struct msm_gem_address_space *aspace,
+		struct msm_gpu *gpu,
 		struct msm_gpu_submitqueue *queue, uint32_t nr_bos,
 		uint32_t nr_cmds)
 {
@@ -43,7 +43,7 @@ static struct msm_gem_submit *submit_create(struct drm_device *dev,
 		return NULL;
 
 	submit->dev = dev;
-	submit->aspace = aspace;
+	submit->aspace = queue->ctx->aspace;
 	submit->gpu = gpu;
 	submit->fence = NULL;
 	submit->cmd = (void *)&submit->bos[nr_bos];
@@ -677,7 +677,7 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
 		}
 	}
 
-	submit = submit_create(dev, gpu, ctx->aspace, queue, args->nr_bos,
+	submit = submit_create(dev, gpu, queue, args->nr_bos,
 		args->nr_cmds);
 	if (!submit) {
 		ret = -ENOMEM;
@@ -785,7 +785,7 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
 		}
 	}
 
-	msm_gpu_submit(gpu, submit, ctx);
+	msm_gpu_submit(gpu, submit);
 
 	args->fence = submit->fence->seqno;
 
diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index d5645472b25d..a1f3da6550e5 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -520,7 +520,7 @@ static void recover_worker(struct work_struct *work)
 			struct msm_ringbuffer *ring = gpu->rb[i];
 
 			list_for_each_entry(submit, &ring->submits, node)
-				gpu->funcs->submit(gpu, submit, NULL);
+				gpu->funcs->submit(gpu, submit);
 		}
 	}
 
@@ -747,8 +747,7 @@ void msm_gpu_retire(struct msm_gpu *gpu)
 }
 
 /* add bo's to gpu's ring, and kick gpu: */
-void msm_gpu_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
-		struct msm_file_private *ctx)
+void msm_gpu_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit)
 {
 	struct drm_device *dev = gpu->dev;
 	struct msm_drm_private *priv = dev->dev_private;
@@ -788,8 +787,8 @@ void msm_gpu_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
 			msm_gem_move_to_active(&msm_obj->base, gpu, false, submit->fence);
 	}
 
-	gpu->funcs->submit(gpu, submit, ctx);
-	priv->lastctx = ctx;
+	gpu->funcs->submit(gpu, submit);
+	priv->lastctx = submit->queue->ctx;
 
 	hangcheck_timer_reset(gpu);
 }
diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
index 0db117a7339b..d496d488222c 100644
--- a/drivers/gpu/drm/msm/msm_gpu.h
+++ b/drivers/gpu/drm/msm/msm_gpu.h
@@ -44,8 +44,7 @@ struct msm_gpu_funcs {
 	int (*hw_init)(struct msm_gpu *gpu);
 	int (*pm_suspend)(struct msm_gpu *gpu);
 	int (*pm_resume)(struct msm_gpu *gpu);
-	void (*submit)(struct msm_gpu *gpu, struct msm_gem_submit *submit,
-			struct msm_file_private *ctx);
+	void (*submit)(struct msm_gpu *gpu, struct msm_gem_submit *submit);
 	void (*flush)(struct msm_gpu *gpu, struct msm_ringbuffer *ring);
 	irqreturn_t (*irq)(struct msm_gpu *irq);
 	struct msm_ringbuffer *(*active_ring)(struct msm_gpu *gpu);
@@ -181,6 +180,7 @@ struct msm_gpu_submitqueue {
 	u32 flags;
 	u32 prio;
 	int faults;
+	struct msm_file_private *ctx;
 	struct list_head node;
 	struct kref ref;
 };
@@ -280,8 +280,7 @@ int msm_gpu_perfcntr_sample(struct msm_gpu *gpu, uint32_t *activetime,
 		uint32_t *totaltime, uint32_t ncntrs, uint32_t *cntrs);
 
 void msm_gpu_retire(struct msm_gpu *gpu);
-void msm_gpu_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
-		struct msm_file_private *ctx);
+void msm_gpu_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit);
 
 int msm_gpu_init(struct drm_device *drm, struct platform_device *pdev,
 		struct msm_gpu *gpu, const struct msm_gpu_funcs *funcs,
diff --git a/drivers/gpu/drm/msm/msm_submitqueue.c b/drivers/gpu/drm/msm/msm_submitqueue.c
index a1d94be7883a..10f557225a3e 100644
--- a/drivers/gpu/drm/msm/msm_submitqueue.c
+++ b/drivers/gpu/drm/msm/msm_submitqueue.c
@@ -49,8 +49,10 @@ void msm_submitqueue_close(struct msm_file_private *ctx)
 	 * No lock needed in close and there won't
 	 * be any more user ioctls coming our way
 	 */
-	list_for_each_entry_safe(entry, tmp, &ctx->submitqueues, node)
+	list_for_each_entry_safe(entry, tmp, &ctx->submitqueues, node) {
+		kref_put(&ctx->ref, msm_file_private_destroy);
 		msm_submitqueue_put(entry);
+	}
 }
 
 int msm_submitqueue_create(struct drm_device *drm, struct msm_file_private *ctx,
@@ -81,6 +83,9 @@ int msm_submitqueue_create(struct drm_device *drm, struct msm_file_private *ctx,
 
 	write_lock(&ctx->queuelock);
 
+	kref_get(&ctx->ref);
+
+	queue->ctx = ctx;
 	queue->id = ctx->queueid++;
 
 	if (id)
@@ -177,6 +182,7 @@ int msm_submitqueue_remove(struct msm_file_private *ctx, u32 id)
 			list_del(&entry->node);
 			write_unlock(&ctx->queuelock);
 
+			kref_put(&ctx->ref, msm_file_private_destroy);
 			msm_submitqueue_put(entry);
 			return 0;
 		}
-- 
2.25.1

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[PATCH v11 08/12] drm/msm: Set the global virtual address range from the IOMMU domain

[Jordan Crouse]

Use the aperture settings from the IOMMU domain to set up the virtual
address range for the GPU. This allows us to transparently deal with
IOMMU side features (like split pagetables).

Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
---

 drivers/gpu/drm/msm/adreno/adreno_gpu.c | 13 +++++++++++--
 drivers/gpu/drm/msm/msm_iommu.c         |  7 +++++++
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index b38a8126541a..f9e3badf2fca 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -192,9 +192,18 @@ adreno_iommu_create_address_space(struct msm_gpu *gpu,
 	struct iommu_domain *iommu = iommu_domain_alloc(&platform_bus_type);
 	struct msm_mmu *mmu = msm_iommu_new(&pdev->dev, iommu);
 	struct msm_gem_address_space *aspace;
+	u64 start, size;
 
-	aspace = msm_gem_address_space_create(mmu, "gpu", SZ_16M,
-		0xffffffff - SZ_16M);
+	/*
+	 * Use the aperture start or SZ_16M, whichever is greater. This will
+	 * ensure that we align with the allocated pagetable range while still
+	 * allowing room in the lower 32 bits for GMEM and whatnot
+	 */
+	start = max_t(u64, SZ_16M, iommu->geometry.aperture_start);
+	size = iommu->geometry.aperture_end - start + 1;
+
+	aspace = msm_gem_address_space_create(mmu, "gpu",
+		start & GENMASK(48, 0), size);
 
 	if (IS_ERR(aspace) && !IS_ERR(mmu))
 		mmu->funcs->destroy(mmu);
diff --git a/drivers/gpu/drm/msm/msm_iommu.c b/drivers/gpu/drm/msm/msm_iommu.c
index 3a381a9674c9..1b6635504069 100644
--- a/drivers/gpu/drm/msm/msm_iommu.c
+++ b/drivers/gpu/drm/msm/msm_iommu.c
@@ -36,6 +36,10 @@ static int msm_iommu_map(struct msm_mmu *mmu, uint64_t iova,
 	struct msm_iommu *iommu = to_msm_iommu(mmu);
 	size_t ret;
 
+	/* The arm-smmu driver expects the addresses to be sign extended */
+	if (iova & BIT_ULL(48))
+		iova |= GENMASK_ULL(63, 49);
+
 	ret = iommu_map_sg(iommu->domain, iova, sgt->sgl, sgt->nents, prot);
 	WARN_ON(!ret);
 
@@ -46,6 +50,9 @@ static int msm_iommu_unmap(struct msm_mmu *mmu, uint64_t iova, size_t len)
 {
 	struct msm_iommu *iommu = to_msm_iommu(mmu);
 
+	if (iova & BIT_ULL(48))
+		iova |= GENMASK_ULL(63, 49);
+
 	iommu_unmap(iommu->domain, iova, len);
 
 	return 0;
-- 
2.25.1

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[PATCH v11 09/12] drm/msm: Add support to create a local pagetable

[Jordan Crouse]

Add support to create a io-pgtable for use by targets that support
per-instance pagetables. In order to support per-instance pagetables the
GPU SMMU device needs to have the qcom,adreno-smmu compatible string and
split pagetables enabled.

Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
---

 drivers/gpu/drm/msm/msm_gpummu.c |   2 +-
 drivers/gpu/drm/msm/msm_iommu.c  | 191 ++++++++++++++++++++++++++++++-
 drivers/gpu/drm/msm/msm_mmu.h    |  16 ++-
 3 files changed, 206 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gpummu.c b/drivers/gpu/drm/msm/msm_gpummu.c
index 310a31b05faa..aab121f4beb7 100644
--- a/drivers/gpu/drm/msm/msm_gpummu.c
+++ b/drivers/gpu/drm/msm/msm_gpummu.c
@@ -102,7 +102,7 @@ struct msm_mmu *msm_gpummu_new(struct device *dev, struct msm_gpu *gpu)
 	}
 
 	gpummu->gpu = gpu;
-	msm_mmu_init(&gpummu->base, dev, &funcs);
+	msm_mmu_init(&gpummu->base, dev, &funcs, MSM_MMU_GPUMMU);
 
 	return &gpummu->base;
 }
diff --git a/drivers/gpu/drm/msm/msm_iommu.c b/drivers/gpu/drm/msm/msm_iommu.c
index 1b6635504069..bc6a4bbc904a 100644
--- a/drivers/gpu/drm/msm/msm_iommu.c
+++ b/drivers/gpu/drm/msm/msm_iommu.c
@@ -4,15 +4,202 @@
  * Author: Rob Clark <robdclark@gmail.com>
  */
 
+#include <linux/io-pgtable.h>
 #include "msm_drv.h"
 #include "msm_mmu.h"
 
 struct msm_iommu {
 	struct msm_mmu base;
 	struct iommu_domain *domain;
+	atomic_t pagetables;
 };
+
 #define to_msm_iommu(x) container_of(x, struct msm_iommu, base)
 
+struct msm_iommu_pagetable {
+	struct msm_mmu base;
+	struct msm_mmu *parent;
+	struct io_pgtable_ops *pgtbl_ops;
+	phys_addr_t ttbr;
+	u32 asid;
+};
+static struct msm_iommu_pagetable *to_pagetable(struct msm_mmu *mmu)
+{
+	return container_of(mmu, struct msm_iommu_pagetable, base);
+}
+
+static int msm_iommu_pagetable_unmap(struct msm_mmu *mmu, u64 iova,
+		size_t size)
+{
+	struct msm_iommu_pagetable *pagetable = to_pagetable(mmu);
+	struct io_pgtable_ops *ops = pagetable->pgtbl_ops;
+	size_t unmapped = 0;
+
+	/* Unmap the block one page at a time */
+	while (size) {
+		unmapped += ops->unmap(ops, iova, 4096, NULL);
+		iova += 4096;
+		size -= 4096;
+	}
+
+	iommu_flush_tlb_all(to_msm_iommu(pagetable->parent)->domain);
+
+	return (unmapped == size) ? 0 : -EINVAL;
+}
+
+static int msm_iommu_pagetable_map(struct msm_mmu *mmu, u64 iova,
+		struct sg_table *sgt, size_t len, int prot)
+{
+	struct msm_iommu_pagetable *pagetable = to_pagetable(mmu);
+	struct io_pgtable_ops *ops = pagetable->pgtbl_ops;
+	struct scatterlist *sg;
+	size_t mapped = 0;
+	u64 addr = iova;
+	unsigned int i;
+
+	for_each_sg(sgt->sgl, sg, sgt->nents, i) {
+		size_t size = sg->length;
+		phys_addr_t phys = sg_phys(sg);
+
+		/* Map the block one page at a time */
+		while (size) {
+			if (ops->map(ops, addr, phys, 4096, prot, GFP_KERNEL)) {
+				msm_iommu_pagetable_unmap(mmu, iova, mapped);
+				return -EINVAL;
+			}
+
+			phys += 4096;
+			addr += 4096;
+			size -= 4096;
+			mapped += 4096;
+		}
+	}
+
+	return 0;
+}
+
+static void msm_iommu_pagetable_destroy(struct msm_mmu *mmu)
+{
+	struct msm_iommu_pagetable *pagetable = to_pagetable(mmu);
+	struct msm_iommu *iommu = to_msm_iommu(pagetable->parent);
+
+	/*
+	 * If this is the last attached pagetable for the parent,
+	 * disable TTBR0 in the arm-smmu driver
+	 */
+	if (atomic_dec_return(&iommu->pagetables) == 0)
+		iommu_domain_set_attr(iommu->domain,
+			DOMAIN_ATTR_PGTABLE_CFG, NULL);
+
+	free_io_pgtable_ops(pagetable->pgtbl_ops);
+	kfree(pagetable);
+}
+
+int msm_iommu_pagetable_params(struct msm_mmu *mmu,
+		phys_addr_t *ttbr, int *asid)
+{
+	struct msm_iommu_pagetable *pagetable;
+
+	if (mmu->type != MSM_MMU_IOMMU_PAGETABLE)
+		return -EINVAL;
+
+	pagetable = to_pagetable(mmu);
+
+	if (ttbr)
+		*ttbr = pagetable->ttbr;
+
+	if (asid)
+		*asid = pagetable->asid;
+
+	return 0;
+}
+
+static const struct msm_mmu_funcs pagetable_funcs = {
+		.map = msm_iommu_pagetable_map,
+		.unmap = msm_iommu_pagetable_unmap,
+		.destroy = msm_iommu_pagetable_destroy,
+};
+
+static void msm_iommu_tlb_flush_all(void *cookie)
+{
+}
+
+static void msm_iommu_tlb_flush_walk(unsigned long iova, size_t size,
+		size_t granule, void *cookie)
+{
+}
+
+static void msm_iommu_tlb_add_page(struct iommu_iotlb_gather *gather,
+		unsigned long iova, size_t granule, void *cookie)
+{
+}
+
+static const struct iommu_flush_ops null_tlb_ops = {
+	.tlb_flush_all = msm_iommu_tlb_flush_all,
+	.tlb_flush_walk = msm_iommu_tlb_flush_walk,
+	.tlb_flush_leaf = msm_iommu_tlb_flush_walk,
+	.tlb_add_page = msm_iommu_tlb_add_page,
+};
+
+struct msm_mmu *msm_iommu_pagetable_create(struct msm_mmu *parent)
+{
+	struct msm_iommu *iommu = to_msm_iommu(parent);
+	static int next_asid = 16;
+	struct msm_iommu_pagetable *pagetable;
+	struct io_pgtable_cfg cfg;
+	int ret;
+
+	/* Get the pagetable configuration from the domain */
+	ret = iommu_domain_get_attr(iommu->domain,
+		DOMAIN_ATTR_PGTABLE_CFG, &cfg);
+	if (ret)
+		return ERR_PTR(ret);
+
+	pagetable = kzalloc(sizeof(*pagetable), GFP_KERNEL);
+	if (!pagetable)
+		return ERR_PTR(-ENOMEM);
+
+	msm_mmu_init(&pagetable->base, parent->dev, &pagetable_funcs,
+		MSM_MMU_IOMMU_PAGETABLE);
+
+	/* The incoming cfg will have the TTBR1 quirk enabled */
+	cfg.quirks &= ~IO_PGTABLE_QUIRK_ARM_TTBR1;
+	cfg.tlb = &null_tlb_ops;
+
+	pagetable->pgtbl_ops = alloc_io_pgtable_ops(ARM_64_LPAE_S1,
+		&cfg, iommu->domain);
+
+	if (!pagetable->pgtbl_ops) {
+		kfree(pagetable);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	/*
+	 * If this is the first pagetable that we've allocated, send it back to
+	 * the arm-smmu driver as a trigger to set up TTBR0
+	 */
+	if (atomic_inc_return(&iommu->pagetables) == 1) {
+		ret = iommu_domain_set_attr(iommu->domain,
+			DOMAIN_ATTR_PGTABLE_CFG, &cfg);
+		if (ret) {
+			free_io_pgtable_ops(pagetable->pgtbl_ops);
+			kfree(pagetable);
+			return ERR_PTR(ret);
+		}
+	}
+
+	/* Needed later for TLB flush */
+	pagetable->parent = parent;
+	pagetable->ttbr = cfg.arm_lpae_s1_cfg.ttbr;
+
+	pagetable->asid = next_asid;
+	next_asid = (next_asid + 1)  % 255;
+	if (next_asid < 16)
+		next_asid = 16;
+
+	return &pagetable->base;
+}
+
 static int msm_fault_handler(struct iommu_domain *domain, struct device *dev,
 		unsigned long iova, int flags, void *arg)
 {
@@ -85,9 +272,11 @@ struct msm_mmu *msm_iommu_new(struct device *dev, struct iommu_domain *domain)
 		return ERR_PTR(-ENOMEM);
 
 	iommu->domain = domain;
-	msm_mmu_init(&iommu->base, dev, &funcs);
+	msm_mmu_init(&iommu->base, dev, &funcs, MSM_MMU_IOMMU);
 	iommu_set_fault_handler(domain, msm_fault_handler, iommu);
 
+	atomic_set(&iommu->pagetables, 0);
+
 	ret = iommu_attach_device(iommu->domain, dev);
 	if (ret) {
 		kfree(iommu);
diff --git a/drivers/gpu/drm/msm/msm_mmu.h b/drivers/gpu/drm/msm/msm_mmu.h
index 3a534ee59bf6..61ade89d9e48 100644
--- a/drivers/gpu/drm/msm/msm_mmu.h
+++ b/drivers/gpu/drm/msm/msm_mmu.h
@@ -17,18 +17,26 @@ struct msm_mmu_funcs {
 	void (*destroy)(struct msm_mmu *mmu);
 };
 
+enum msm_mmu_type {
+	MSM_MMU_GPUMMU,
+	MSM_MMU_IOMMU,
+	MSM_MMU_IOMMU_PAGETABLE,
+};
+
 struct msm_mmu {
 	const struct msm_mmu_funcs *funcs;
 	struct device *dev;
 	int (*handler)(void *arg, unsigned long iova, int flags);
 	void *arg;
+	enum msm_mmu_type type;
 };
 
 static inline void msm_mmu_init(struct msm_mmu *mmu, struct device *dev,
-		const struct msm_mmu_funcs *funcs)
+		const struct msm_mmu_funcs *funcs, enum msm_mmu_type type)
 {
 	mmu->dev = dev;
 	mmu->funcs = funcs;
+	mmu->type = type;
 }
 
 struct msm_mmu *msm_iommu_new(struct device *dev, struct iommu_domain *domain);
@@ -41,7 +49,13 @@ static inline void msm_mmu_set_fault_handler(struct msm_mmu *mmu, void *arg,
 	mmu->handler = handler;
 }
 
+struct msm_mmu *msm_iommu_pagetable_create(struct msm_mmu *parent);
+
 void msm_gpummu_params(struct msm_mmu *mmu, dma_addr_t *pt_base,
 		dma_addr_t *tran_error);
 
+
+int msm_iommu_pagetable_params(struct msm_mmu *mmu, phys_addr_t *ttbr,
+		int *asid);
+
 #endif /* __MSM_MMU_H__ */
-- 
2.25.1

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[PATCH v11 10/12] drm/msm: Add support for private address space instances

[Jordan Crouse]

Add support for allocating private address space instances. Targets that
support per-context pagetables should implement their own function to
allocate private address spaces.

The default will return a pointer to the global address space.

Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
---

 drivers/gpu/drm/msm/msm_drv.c     | 13 +++++++------
 drivers/gpu/drm/msm/msm_drv.h     |  5 +++++
 drivers/gpu/drm/msm/msm_gem_vma.c |  9 +++++++++
 drivers/gpu/drm/msm/msm_gpu.c     | 17 +++++++++++++++++
 drivers/gpu/drm/msm/msm_gpu.h     |  5 +++++
 5 files changed, 43 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 108b663c3ef2..f072306f1260 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -597,7 +597,7 @@ static int context_init(struct drm_device *dev, struct drm_file *file)
 	kref_init(&ctx->ref);
 	msm_submitqueue_init(dev, ctx);
 
-	ctx->aspace = priv->gpu ? priv->gpu->aspace : NULL;
+	ctx->aspace = msm_gpu_create_private_address_space(priv->gpu);
 	file->driver_priv = ctx;
 
 	return 0;
@@ -780,18 +780,19 @@ static int msm_ioctl_gem_cpu_fini(struct drm_device *dev, void *data,
 }
 
 static int msm_ioctl_gem_info_iova(struct drm_device *dev,
-		struct drm_gem_object *obj, uint64_t *iova)
+		struct drm_file *file, struct drm_gem_object *obj,
+		uint64_t *iova)
 {
-	struct msm_drm_private *priv = dev->dev_private;
+	struct msm_file_private *ctx = file->driver_priv;
 
-	if (!priv->gpu)
+	if (!ctx->aspace)
 		return -EINVAL;
 
 	/*
 	 * Don't pin the memory here - just get an address so that userspace can
 	 * be productive
 	 */
-	return msm_gem_get_iova(obj, priv->gpu->aspace, iova);
+	return msm_gem_get_iova(obj, ctx->aspace, iova);
 }
 
 static int msm_ioctl_gem_info(struct drm_device *dev, void *data,
@@ -830,7 +831,7 @@ static int msm_ioctl_gem_info(struct drm_device *dev, void *data,
 		args->value = msm_gem_mmap_offset(obj);
 		break;
 	case MSM_INFO_GET_IOVA:
-		ret = msm_ioctl_gem_info_iova(dev, obj, &args->value);
+		ret = msm_ioctl_gem_info_iova(dev, file, obj, &args->value);
 		break;
 	case MSM_INFO_SET_NAME:
 		/* length check should leave room for terminating null: */
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index f69c6d62584d..51a5c9083e13 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -249,6 +249,10 @@ int msm_gem_map_vma(struct msm_gem_address_space *aspace,
 void msm_gem_close_vma(struct msm_gem_address_space *aspace,
 		struct msm_gem_vma *vma);
 
+
+struct msm_gem_address_space *
+msm_gem_address_space_get(struct msm_gem_address_space *aspace);
+
 void msm_gem_address_space_put(struct msm_gem_address_space *aspace);
 
 struct msm_gem_address_space *
@@ -434,6 +438,7 @@ static inline void msm_file_private_destroy(struct kref *kref)
 	struct msm_file_private *ctx = container_of(kref,
 		struct msm_file_private, ref);
 
+	msm_gem_address_space_put(ctx->aspace);
 	kfree(ctx);
 }
 
diff --git a/drivers/gpu/drm/msm/msm_gem_vma.c b/drivers/gpu/drm/msm/msm_gem_vma.c
index 5f6a11211b64..29cc1305cf37 100644
--- a/drivers/gpu/drm/msm/msm_gem_vma.c
+++ b/drivers/gpu/drm/msm/msm_gem_vma.c
@@ -27,6 +27,15 @@ void msm_gem_address_space_put(struct msm_gem_address_space *aspace)
 		kref_put(&aspace->kref, msm_gem_address_space_destroy);
 }
 
+struct msm_gem_address_space *
+msm_gem_address_space_get(struct msm_gem_address_space *aspace)
+{
+	if (!IS_ERR_OR_NULL(aspace))
+		kref_get(&aspace->kref);
+
+	return aspace;
+}
+
 /* Actually unmap memory for the vma */
 void msm_gem_purge_vma(struct msm_gem_address_space *aspace,
 		struct msm_gem_vma *vma)
diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index a1f3da6550e5..aabbd7908ee5 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -823,6 +823,23 @@ static int get_clocks(struct platform_device *pdev, struct msm_gpu *gpu)
 	return 0;
 }
 
+/* Return a new address space for a msm_drm_private instance */
+struct msm_gem_address_space *
+msm_gpu_create_private_address_space(struct msm_gpu *gpu)
+{
+	if (!gpu)
+		return NULL;
+
+	/*
+	 * If the target doesn't support private address spaces then return
+	 * the global one
+	 */
+	if (!gpu->funcs->create_private_address_space)
+		return msm_gem_address_space_get(gpu->aspace);
+
+	return gpu->funcs->create_private_address_space(gpu);
+}
+
 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, struct msm_gpu_config *config)
diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
index d496d488222c..d298657b4730 100644
--- a/drivers/gpu/drm/msm/msm_gpu.h
+++ b/drivers/gpu/drm/msm/msm_gpu.h
@@ -64,6 +64,8 @@ struct msm_gpu_funcs {
 	void (*gpu_set_freq)(struct msm_gpu *gpu, struct dev_pm_opp *opp);
 	struct msm_gem_address_space *(*create_address_space)
 		(struct msm_gpu *gpu, struct platform_device *pdev);
+	struct msm_gem_address_space *(*create_private_address_space)
+		(struct msm_gpu *gpu);
 };
 
 struct msm_gpu {
@@ -286,6 +288,9 @@ 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, struct msm_gpu_config *config);
 
+struct msm_gem_address_space *
+msm_gpu_create_private_address_space(struct msm_gpu *gpu);
+
 void msm_gpu_cleanup(struct msm_gpu *gpu);
 
 struct msm_gpu *adreno_load_gpu(struct drm_device *dev);
-- 
2.25.1

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[PATCH v11 11/12] drm/msm/a6xx: Add support for per-instance pagetables

[Jordan Crouse]

Add support for using per-instance pagetables if all the dependencies are
available.

Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
---

 drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 53 +++++++++++++++++++++++++++
 drivers/gpu/drm/msm/adreno/a6xx_gpu.h |  1 +
 drivers/gpu/drm/msm/msm_ringbuffer.h  |  1 +
 3 files changed, 55 insertions(+)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index 5eabb0109577..57c6cdec7e9a 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -81,6 +81,41 @@ static void get_stats_counter(struct msm_ringbuffer *ring, u32 counter,
 	OUT_RING(ring, upper_32_bits(iova));
 }
 
+static void a6xx_set_pagetable(struct a6xx_gpu *a6xx_gpu,
+		struct msm_ringbuffer *ring, struct msm_file_private *ctx)
+{
+	phys_addr_t ttbr;
+	u32 asid;
+	u64 memptr = rbmemptr(ring, ttbr0);
+
+	if (ctx == a6xx_gpu->cur_ctx)
+		return;
+
+	if (msm_iommu_pagetable_params(ctx->aspace->mmu, &ttbr, &asid))
+		return;
+
+	/* Execute the table update */
+	OUT_PKT7(ring, CP_SMMU_TABLE_UPDATE, 4);
+	OUT_RING(ring, CP_SMMU_TABLE_UPDATE_0_TTBR0_LO(lower_32_bits(ttbr)));
+	OUT_RING(ring,
+		CP_SMMU_TABLE_UPDATE_1_TTBR0_HI(upper_32_bits(ttbr)) |
+		CP_SMMU_TABLE_UPDATE_1_ASID(asid));
+	OUT_RING(ring, CP_SMMU_TABLE_UPDATE_2_CONTEXTIDR(0));
+	OUT_RING(ring, CP_SMMU_TABLE_UPDATE_3_CONTEXTBANK(0));
+
+	/*
+	 * Write the new TTBR0 to the memstore. This is good for debugging.
+	 */
+	OUT_PKT7(ring, CP_MEM_WRITE, 4);
+	OUT_RING(ring, CP_MEM_WRITE_0_ADDR_LO(lower_32_bits(memptr)));
+	OUT_RING(ring, CP_MEM_WRITE_1_ADDR_HI(upper_32_bits(memptr)));
+	OUT_RING(ring, lower_32_bits(ttbr));
+	OUT_RING(ring, (asid << 16) | upper_32_bits(ttbr));
+
+
+	a6xx_gpu->cur_ctx = ctx;
+}
+
 static void a6xx_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit)
 {
 	unsigned int index = submit->seqno % MSM_GPU_SUBMIT_STATS_COUNT;
@@ -90,6 +125,8 @@ static void a6xx_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit)
 	struct msm_ringbuffer *ring = submit->ring;
 	unsigned int i;
 
+	a6xx_set_pagetable(a6xx_gpu, ring, submit->queue->ctx);
+
 	get_stats_counter(ring, REG_A6XX_RBBM_PERFCTR_CP_0_LO,
 		rbmemptr_stats(ring, index, cpcycles_start));
 
@@ -696,6 +733,8 @@ static int a6xx_hw_init(struct msm_gpu *gpu)
 	/* Always come up on rb 0 */
 	a6xx_gpu->cur_ring = gpu->rb[0];
 
+	a6xx_gpu->cur_ctx = NULL;
+
 	/* Enable the SQE_to start the CP engine */
 	gpu_write(gpu, REG_A6XX_CP_SQE_CNTL, 1);
 
@@ -1008,6 +1047,19 @@ static unsigned long a6xx_gpu_busy(struct msm_gpu *gpu)
 	return (unsigned long)busy_time;
 }
 
+static struct msm_gem_address_space *
+a6xx_create_private_address_space(struct msm_gpu *gpu)
+{
+	struct msm_mmu *mmu;
+
+	mmu = msm_iommu_pagetable_create(gpu->aspace->mmu);
+	if (IS_ERR(mmu))
+		return msm_gem_address_space_get(gpu->aspace);
+
+	return msm_gem_address_space_create(mmu,
+		"gpu", 0x100000000ULL, 0x1ffffffffULL);
+}
+
 static const struct adreno_gpu_funcs funcs = {
 	.base = {
 		.get_param = adreno_get_param,
@@ -1031,6 +1083,7 @@ static const struct adreno_gpu_funcs funcs = {
 		.gpu_state_put = a6xx_gpu_state_put,
 #endif
 		.create_address_space = adreno_iommu_create_address_space,
+		.create_private_address_space = a6xx_create_private_address_space,
 	},
 	.get_timestamp = a6xx_get_timestamp,
 };
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.h b/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
index 03ba60d5b07f..da22d7549d9b 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
@@ -19,6 +19,7 @@ struct a6xx_gpu {
 	uint64_t sqe_iova;
 
 	struct msm_ringbuffer *cur_ring;
+	struct msm_file_private *cur_ctx;
 
 	struct a6xx_gmu gmu;
 };
diff --git a/drivers/gpu/drm/msm/msm_ringbuffer.h b/drivers/gpu/drm/msm/msm_ringbuffer.h
index 7764373d0ed2..0987d6bf848c 100644
--- a/drivers/gpu/drm/msm/msm_ringbuffer.h
+++ b/drivers/gpu/drm/msm/msm_ringbuffer.h
@@ -31,6 +31,7 @@ struct msm_rbmemptrs {
 	volatile uint32_t fence;
 
 	volatile struct msm_gpu_submit_stats stats[MSM_GPU_SUBMIT_STATS_COUNT];
+	volatile u64 ttbr0;
 };
 
 struct msm_ringbuffer {
-- 
2.25.1

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Re: [Freedreno] [PATCH v11 09/12] drm/msm: Add support to create a local pagetable

[Rob Clark]

On Mon, Aug 3, 2020 at 12:36 PM Jordan Crouse <jcrouse@codeaurora.org> wrote:
>
> Add support to create a io-pgtable for use by targets that support
> per-instance pagetables. In order to support per-instance pagetables the
> GPU SMMU device needs to have the qcom,adreno-smmu compatible string and
> split pagetables enabled.
>
> Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
> ---
>
>  drivers/gpu/drm/msm/msm_gpummu.c |   2 +-
>  drivers/gpu/drm/msm/msm_iommu.c  | 191 ++++++++++++++++++++++++++++++-
>  drivers/gpu/drm/msm/msm_mmu.h    |  16 ++-
>  3 files changed, 206 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/msm_gpummu.c b/drivers/gpu/drm/msm/msm_gpummu.c
> index 310a31b05faa..aab121f4beb7 100644
> --- a/drivers/gpu/drm/msm/msm_gpummu.c
> +++ b/drivers/gpu/drm/msm/msm_gpummu.c
> @@ -102,7 +102,7 @@ struct msm_mmu *msm_gpummu_new(struct device *dev, struct msm_gpu *gpu)
>         }
>
>         gpummu->gpu = gpu;
> -       msm_mmu_init(&gpummu->base, dev, &funcs);
> +       msm_mmu_init(&gpummu->base, dev, &funcs, MSM_MMU_GPUMMU);
>
>         return &gpummu->base;
>  }
> diff --git a/drivers/gpu/drm/msm/msm_iommu.c b/drivers/gpu/drm/msm/msm_iommu.c
> index 1b6635504069..bc6a4bbc904a 100644
> --- a/drivers/gpu/drm/msm/msm_iommu.c
> +++ b/drivers/gpu/drm/msm/msm_iommu.c
> @@ -4,15 +4,202 @@
>   * Author: Rob Clark <robdclark@gmail.com>
>   */
>
> +#include <linux/io-pgtable.h>
>  #include "msm_drv.h"
>  #include "msm_mmu.h"
>
>  struct msm_iommu {
>         struct msm_mmu base;
>         struct iommu_domain *domain;
> +       atomic_t pagetables;
>  };
> +
>  #define to_msm_iommu(x) container_of(x, struct msm_iommu, base)
>
> +struct msm_iommu_pagetable {
> +       struct msm_mmu base;
> +       struct msm_mmu *parent;
> +       struct io_pgtable_ops *pgtbl_ops;
> +       phys_addr_t ttbr;
> +       u32 asid;
> +};
> +static struct msm_iommu_pagetable *to_pagetable(struct msm_mmu *mmu)
> +{
> +       return container_of(mmu, struct msm_iommu_pagetable, base);
> +}
> +
> +static int msm_iommu_pagetable_unmap(struct msm_mmu *mmu, u64 iova,
> +               size_t size)
> +{
> +       struct msm_iommu_pagetable *pagetable = to_pagetable(mmu);
> +       struct io_pgtable_ops *ops = pagetable->pgtbl_ops;
> +       size_t unmapped = 0;
> +
> +       /* Unmap the block one page at a time */
> +       while (size) {
> +               unmapped += ops->unmap(ops, iova, 4096, NULL);
> +               iova += 4096;
> +               size -= 4096;
> +       }
> +
> +       iommu_flush_tlb_all(to_msm_iommu(pagetable->parent)->domain);
> +
> +       return (unmapped == size) ? 0 : -EINVAL;
> +}
> +
> +static int msm_iommu_pagetable_map(struct msm_mmu *mmu, u64 iova,
> +               struct sg_table *sgt, size_t len, int prot)
> +{
> +       struct msm_iommu_pagetable *pagetable = to_pagetable(mmu);
> +       struct io_pgtable_ops *ops = pagetable->pgtbl_ops;
> +       struct scatterlist *sg;
> +       size_t mapped = 0;
> +       u64 addr = iova;
> +       unsigned int i;
> +
> +       for_each_sg(sgt->sgl, sg, sgt->nents, i) {
> +               size_t size = sg->length;
> +               phys_addr_t phys = sg_phys(sg);
> +
> +               /* Map the block one page at a time */
> +               while (size) {
> +                       if (ops->map(ops, addr, phys, 4096, prot, GFP_KERNEL)) {
> +                               msm_iommu_pagetable_unmap(mmu, iova, mapped);
> +                               return -EINVAL;
> +                       }
> +
> +                       phys += 4096;
> +                       addr += 4096;
> +                       size -= 4096;
> +                       mapped += 4096;
> +               }
> +       }
> +
> +       return 0;
> +}
> +
> +static void msm_iommu_pagetable_destroy(struct msm_mmu *mmu)
> +{
> +       struct msm_iommu_pagetable *pagetable = to_pagetable(mmu);
> +       struct msm_iommu *iommu = to_msm_iommu(pagetable->parent);
> +
> +       /*
> +        * If this is the last attached pagetable for the parent,
> +        * disable TTBR0 in the arm-smmu driver
> +        */
> +       if (atomic_dec_return(&iommu->pagetables) == 0)
> +               iommu_domain_set_attr(iommu->domain,
> +                       DOMAIN_ATTR_PGTABLE_CFG, NULL);
> +
> +       free_io_pgtable_ops(pagetable->pgtbl_ops);
> +       kfree(pagetable);
> +}
> +
> +int msm_iommu_pagetable_params(struct msm_mmu *mmu,
> +               phys_addr_t *ttbr, int *asid)
> +{
> +       struct msm_iommu_pagetable *pagetable;
> +
> +       if (mmu->type != MSM_MMU_IOMMU_PAGETABLE)
> +               return -EINVAL;
> +
> +       pagetable = to_pagetable(mmu);
> +
> +       if (ttbr)
> +               *ttbr = pagetable->ttbr;
> +
> +       if (asid)
> +               *asid = pagetable->asid;
> +
> +       return 0;
> +}
> +
> +static const struct msm_mmu_funcs pagetable_funcs = {
> +               .map = msm_iommu_pagetable_map,
> +               .unmap = msm_iommu_pagetable_unmap,
> +               .destroy = msm_iommu_pagetable_destroy,
> +};
> +
> +static void msm_iommu_tlb_flush_all(void *cookie)
> +{
> +}
> +
> +static void msm_iommu_tlb_flush_walk(unsigned long iova, size_t size,
> +               size_t granule, void *cookie)
> +{
> +}
> +
> +static void msm_iommu_tlb_add_page(struct iommu_iotlb_gather *gather,
> +               unsigned long iova, size_t granule, void *cookie)
> +{
> +}
> +
> +static const struct iommu_flush_ops null_tlb_ops = {
> +       .tlb_flush_all = msm_iommu_tlb_flush_all,
> +       .tlb_flush_walk = msm_iommu_tlb_flush_walk,
> +       .tlb_flush_leaf = msm_iommu_tlb_flush_walk,
> +       .tlb_add_page = msm_iommu_tlb_add_page,
> +};
> +
> +struct msm_mmu *msm_iommu_pagetable_create(struct msm_mmu *parent)
> +{
> +       struct msm_iommu *iommu = to_msm_iommu(parent);
> +       static int next_asid = 16;
> +       struct msm_iommu_pagetable *pagetable;
> +       struct io_pgtable_cfg cfg;
> +       int ret;
> +
> +       /* Get the pagetable configuration from the domain */
> +       ret = iommu_domain_get_attr(iommu->domain,
> +               DOMAIN_ATTR_PGTABLE_CFG, &cfg);
> +       if (ret)
> +               return ERR_PTR(ret);
> +
> +       pagetable = kzalloc(sizeof(*pagetable), GFP_KERNEL);
> +       if (!pagetable)
> +               return ERR_PTR(-ENOMEM);
> +
> +       msm_mmu_init(&pagetable->base, parent->dev, &pagetable_funcs,
> +               MSM_MMU_IOMMU_PAGETABLE);
> +
> +       /* The incoming cfg will have the TTBR1 quirk enabled */
> +       cfg.quirks &= ~IO_PGTABLE_QUIRK_ARM_TTBR1;
> +       cfg.tlb = &null_tlb_ops;
> +
> +       pagetable->pgtbl_ops = alloc_io_pgtable_ops(ARM_64_LPAE_S1,
> +               &cfg, iommu->domain);
> +
> +       if (!pagetable->pgtbl_ops) {
> +               kfree(pagetable);
> +               return ERR_PTR(-ENOMEM);
> +       }
> +
> +       /*
> +        * If this is the first pagetable that we've allocated, send it back to
> +        * the arm-smmu driver as a trigger to set up TTBR0
> +        */
> +       if (atomic_inc_return(&iommu->pagetables) == 1) {
> +               ret = iommu_domain_set_attr(iommu->domain,
> +                       DOMAIN_ATTR_PGTABLE_CFG, &cfg);
> +               if (ret) {
> +                       free_io_pgtable_ops(pagetable->pgtbl_ops);
> +                       kfree(pagetable);
> +                       return ERR_PTR(ret);
> +               }
> +       }
> +
> +       /* Needed later for TLB flush */
> +       pagetable->parent = parent;
> +       pagetable->ttbr = cfg.arm_lpae_s1_cfg.ttbr;
> +
> +       pagetable->asid = next_asid;
> +       next_asid = (next_asid + 1)  % 255;

nit: extra space before '%'

> +       if (next_asid < 16)
> +               next_asid = 16;

nit: next_asid = min(16, next_asid)

?

BR,
-R

> +
> +       return &pagetable->base;
> +}
> +
>  static int msm_fault_handler(struct iommu_domain *domain, struct device *dev,
>                 unsigned long iova, int flags, void *arg)
>  {
> @@ -85,9 +272,11 @@ struct msm_mmu *msm_iommu_new(struct device *dev, struct iommu_domain *domain)
>                 return ERR_PTR(-ENOMEM);
>
>         iommu->domain = domain;
> -       msm_mmu_init(&iommu->base, dev, &funcs);
> +       msm_mmu_init(&iommu->base, dev, &funcs, MSM_MMU_IOMMU);
>         iommu_set_fault_handler(domain, msm_fault_handler, iommu);
>
> +       atomic_set(&iommu->pagetables, 0);
> +
>         ret = iommu_attach_device(iommu->domain, dev);
>         if (ret) {
>                 kfree(iommu);
> diff --git a/drivers/gpu/drm/msm/msm_mmu.h b/drivers/gpu/drm/msm/msm_mmu.h
> index 3a534ee59bf6..61ade89d9e48 100644
> --- a/drivers/gpu/drm/msm/msm_mmu.h
> +++ b/drivers/gpu/drm/msm/msm_mmu.h
> @@ -17,18 +17,26 @@ struct msm_mmu_funcs {
>         void (*destroy)(struct msm_mmu *mmu);
>  };
>
> +enum msm_mmu_type {
> +       MSM_MMU_GPUMMU,
> +       MSM_MMU_IOMMU,
> +       MSM_MMU_IOMMU_PAGETABLE,
> +};
> +
>  struct msm_mmu {
>         const struct msm_mmu_funcs *funcs;
>         struct device *dev;
>         int (*handler)(void *arg, unsigned long iova, int flags);
>         void *arg;
> +       enum msm_mmu_type type;
>  };
>
>  static inline void msm_mmu_init(struct msm_mmu *mmu, struct device *dev,
> -               const struct msm_mmu_funcs *funcs)
> +               const struct msm_mmu_funcs *funcs, enum msm_mmu_type type)
>  {
>         mmu->dev = dev;
>         mmu->funcs = funcs;
> +       mmu->type = type;
>  }
>
>  struct msm_mmu *msm_iommu_new(struct device *dev, struct iommu_domain *domain);
> @@ -41,7 +49,13 @@ static inline void msm_mmu_set_fault_handler(struct msm_mmu *mmu, void *arg,
>         mmu->handler = handler;
>  }
>
> +struct msm_mmu *msm_iommu_pagetable_create(struct msm_mmu *parent);
> +
>  void msm_gpummu_params(struct msm_mmu *mmu, dma_addr_t *pt_base,
>                 dma_addr_t *tran_error);
>
> +
> +int msm_iommu_pagetable_params(struct msm_mmu *mmu, phys_addr_t *ttbr,
> +               int *asid);
> +
>  #endif /* __MSM_MMU_H__ */
> --
> 2.25.1
>
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> https://lists.freedesktop.org/mailman/listinfo/freedreno
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Re: [Freedreno] [PATCH v11 10/12] drm/msm: Add support for private address space instances

[Rob Clark]

On Mon, Aug 3, 2020 at 12:36 PM Jordan Crouse <jcrouse@codeaurora.org> wrote:
>
> Add support for allocating private address space instances. Targets that
> support per-context pagetables should implement their own function to
> allocate private address spaces.
>
> The default will return a pointer to the global address space.
>
> Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
> ---
>
>  drivers/gpu/drm/msm/msm_drv.c     | 13 +++++++------
>  drivers/gpu/drm/msm/msm_drv.h     |  5 +++++
>  drivers/gpu/drm/msm/msm_gem_vma.c |  9 +++++++++
>  drivers/gpu/drm/msm/msm_gpu.c     | 17 +++++++++++++++++
>  drivers/gpu/drm/msm/msm_gpu.h     |  5 +++++
>  5 files changed, 43 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> index 108b663c3ef2..f072306f1260 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -597,7 +597,7 @@ static int context_init(struct drm_device *dev, struct drm_file *file)
>         kref_init(&ctx->ref);
>         msm_submitqueue_init(dev, ctx);
>
> -       ctx->aspace = priv->gpu ? priv->gpu->aspace : NULL;
> +       ctx->aspace = msm_gpu_create_private_address_space(priv->gpu);
>         file->driver_priv = ctx;
>
>         return 0;
> @@ -780,18 +780,19 @@ static int msm_ioctl_gem_cpu_fini(struct drm_device *dev, void *data,
>  }
>
>  static int msm_ioctl_gem_info_iova(struct drm_device *dev,
> -               struct drm_gem_object *obj, uint64_t *iova)
> +               struct drm_file *file, struct drm_gem_object *obj,
> +               uint64_t *iova)
>  {
> -       struct msm_drm_private *priv = dev->dev_private;
> +       struct msm_file_private *ctx = file->driver_priv;
>
> -       if (!priv->gpu)
> +       if (!ctx->aspace)
>                 return -EINVAL;
>
>         /*
>          * Don't pin the memory here - just get an address so that userspace can
>          * be productive
>          */
> -       return msm_gem_get_iova(obj, priv->gpu->aspace, iova);
> +       return msm_gem_get_iova(obj, ctx->aspace, iova);
>  }
>
>  static int msm_ioctl_gem_info(struct drm_device *dev, void *data,
> @@ -830,7 +831,7 @@ static int msm_ioctl_gem_info(struct drm_device *dev, void *data,
>                 args->value = msm_gem_mmap_offset(obj);
>                 break;
>         case MSM_INFO_GET_IOVA:
> -               ret = msm_ioctl_gem_info_iova(dev, obj, &args->value);
> +               ret = msm_ioctl_gem_info_iova(dev, file, obj, &args->value);
>                 break;
>         case MSM_INFO_SET_NAME:
>                 /* length check should leave room for terminating null: */
> diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
> index f69c6d62584d..51a5c9083e13 100644
> --- a/drivers/gpu/drm/msm/msm_drv.h
> +++ b/drivers/gpu/drm/msm/msm_drv.h
> @@ -249,6 +249,10 @@ int msm_gem_map_vma(struct msm_gem_address_space *aspace,
>  void msm_gem_close_vma(struct msm_gem_address_space *aspace,
>                 struct msm_gem_vma *vma);
>
> +
> +struct msm_gem_address_space *
> +msm_gem_address_space_get(struct msm_gem_address_space *aspace);
> +
>  void msm_gem_address_space_put(struct msm_gem_address_space *aspace);
>
>  struct msm_gem_address_space *
> @@ -434,6 +438,7 @@ static inline void msm_file_private_destroy(struct kref *kref)
>         struct msm_file_private *ctx = container_of(kref,
>                 struct msm_file_private, ref);
>
> +       msm_gem_address_space_put(ctx->aspace);
>         kfree(ctx);
>  }
>
> diff --git a/drivers/gpu/drm/msm/msm_gem_vma.c b/drivers/gpu/drm/msm/msm_gem_vma.c
> index 5f6a11211b64..29cc1305cf37 100644
> --- a/drivers/gpu/drm/msm/msm_gem_vma.c
> +++ b/drivers/gpu/drm/msm/msm_gem_vma.c
> @@ -27,6 +27,15 @@ void msm_gem_address_space_put(struct msm_gem_address_space *aspace)
>                 kref_put(&aspace->kref, msm_gem_address_space_destroy);
>  }
>
> +struct msm_gem_address_space *
> +msm_gem_address_space_get(struct msm_gem_address_space *aspace)
> +{
> +       if (!IS_ERR_OR_NULL(aspace))
> +               kref_get(&aspace->kref);
> +
> +       return aspace;
> +}
> +
>  /* Actually unmap memory for the vma */
>  void msm_gem_purge_vma(struct msm_gem_address_space *aspace,
>                 struct msm_gem_vma *vma)
> diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
> index a1f3da6550e5..aabbd7908ee5 100644
> --- a/drivers/gpu/drm/msm/msm_gpu.c
> +++ b/drivers/gpu/drm/msm/msm_gpu.c
> @@ -823,6 +823,23 @@ static int get_clocks(struct platform_device *pdev, struct msm_gpu *gpu)
>         return 0;
>  }
>
> +/* Return a new address space for a msm_drm_private instance */
> +struct msm_gem_address_space *
> +msm_gpu_create_private_address_space(struct msm_gpu *gpu)
> +{
> +       if (!gpu)
> +               return NULL;
> +
> +       /*
> +        * If the target doesn't support private address spaces then return
> +        * the global one
> +        */
> +       if (!gpu->funcs->create_private_address_space)
> +               return msm_gem_address_space_get(gpu->aspace);
> +
> +       return gpu->funcs->create_private_address_space(gpu);

so if you flip the logic around here, you can get rid of the
msm_gem_address_space_get() in per-gen backend and consolidate the
error handling here, ie.

  struct msm_gem_address_space *aspace = NULL;

  if (gpu->funcs->create_private_address_space)
     aspace = gpu->funcs->create_private_address_space(...);

  if (IS_ERR_OR_NULL(aspace))
    aspace = msm_gem_address_space_get(...);

(and that also simplifies a bit the patch I have on top to show comm in debugfs)

BR,
-R

> +}
> +
>  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, struct msm_gpu_config *config)
> diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
> index d496d488222c..d298657b4730 100644
> --- a/drivers/gpu/drm/msm/msm_gpu.h
> +++ b/drivers/gpu/drm/msm/msm_gpu.h
> @@ -64,6 +64,8 @@ struct msm_gpu_funcs {
>         void (*gpu_set_freq)(struct msm_gpu *gpu, struct dev_pm_opp *opp);
>         struct msm_gem_address_space *(*create_address_space)
>                 (struct msm_gpu *gpu, struct platform_device *pdev);
> +       struct msm_gem_address_space *(*create_private_address_space)
> +               (struct msm_gpu *gpu);
>  };
>
>  struct msm_gpu {
> @@ -286,6 +288,9 @@ 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, struct msm_gpu_config *config);
>
> +struct msm_gem_address_space *
> +msm_gpu_create_private_address_space(struct msm_gpu *gpu);
> +
>  void msm_gpu_cleanup(struct msm_gpu *gpu);
>
>  struct msm_gpu *adreno_load_gpu(struct drm_device *dev);
> --
> 2.25.1
>
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