[PATCH 14/14] drm/msm/a5xx: Support per-instance pagetables
Jordan Crouse
jcrouse at codeaurora.org
Wed Feb 21 14:59:24 PST 2018
Add support for per-instance pagetables for 5XX targets. Create a support
buffer for preemption to hold the SMMU pagetable information for a preempted
ring, enable TTBR1 to support split pagetables and add the necessary PM4
commands to trigger a pagetable switch at the beginning of a user command.
Signed-off-by: Jordan Crouse <jcrouse at codeaurora.org>
---
drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 55 ++++++++++++++++++++++
drivers/gpu/drm/msm/adreno/a5xx_gpu.h | 17 +++++++
drivers/gpu/drm/msm/adreno/a5xx_preempt.c | 76 +++++++++++++++++++++++++------
drivers/gpu/drm/msm/adreno/adreno_gpu.c | 11 +++++
drivers/gpu/drm/msm/adreno/adreno_gpu.h | 5 ++
drivers/gpu/drm/msm/msm_ringbuffer.h | 1 +
6 files changed, 152 insertions(+), 13 deletions(-)
diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
index c106606887e2..e5d8df8e8e12 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
@@ -140,6 +140,59 @@ static void a5xx_flush(struct msm_gpu *gpu, struct msm_ringbuffer *ring)
gpu_write(gpu, REG_A5XX_CP_RB_WPTR, wptr);
}
+static void a5xx_set_pagetable(struct msm_gpu *gpu, struct msm_ringbuffer *ring,
+ struct msm_file_private *ctx)
+{
+ u64 ttbr;
+ u32 asid;
+
+ if (msm_iommu_pasid_info(ctx->aspace->mmu, &ttbr, &asid))
+ return;
+
+ ttbr = ttbr | ((u64) asid) << 48;
+
+ /* Turn off protected mode */
+ OUT_PKT7(ring, CP_SET_PROTECTED_MODE, 1);
+ OUT_RING(ring, 0);
+
+ /* Turn on APIV mode to access critical regions */
+ OUT_PKT4(ring, REG_A5XX_CP_CNTL, 1);
+ OUT_RING(ring, 1);
+
+ /* Make sure the ME is synchronized before staring the update */
+ OUT_PKT7(ring, CP_WAIT_FOR_ME, 0);
+
+ /* Execute the table update */
+ OUT_PKT7(ring, CP_SMMU_TABLE_UPDATE, 3);
+ OUT_RING(ring, lower_32_bits(ttbr));
+ OUT_RING(ring, upper_32_bits(ttbr));
+ OUT_RING(ring, 0);
+
+ /*
+ * Write the new TTBR0 to the preemption records - this will be used to
+ * reload the pagetable if the current ring gets preempted out.
+ */
+ OUT_PKT7(ring, CP_MEM_WRITE, 4);
+ OUT_RING(ring, lower_32_bits(rbmemptr(ring, ttbr0)));
+ OUT_RING(ring, upper_32_bits(rbmemptr(ring, ttbr0)));
+ OUT_RING(ring, lower_32_bits(ttbr));
+ OUT_RING(ring, upper_32_bits(ttbr));
+
+ /* Invalidate the draw state so we start off fresh */
+ OUT_PKT7(ring, CP_SET_DRAW_STATE, 3);
+ OUT_RING(ring, 0x40000);
+ OUT_RING(ring, 1);
+ OUT_RING(ring, 0);
+
+ /* Turn off APRIV */
+ OUT_PKT4(ring, REG_A5XX_CP_CNTL, 1);
+ OUT_RING(ring, 0);
+
+ /* Turn off protected mode */
+ OUT_PKT7(ring, CP_SET_PROTECTED_MODE, 1);
+ OUT_RING(ring, 1);
+}
+
static void a5xx_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
struct msm_file_private *ctx)
{
@@ -149,6 +202,8 @@ static void a5xx_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
struct msm_ringbuffer *ring = submit->ring;
unsigned int i, ibs = 0;
+ a5xx_set_pagetable(gpu, ring, ctx);
+
OUT_PKT7(ring, CP_PREEMPT_ENABLE_GLOBAL, 1);
OUT_RING(ring, 0x02);
diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.h b/drivers/gpu/drm/msm/adreno/a5xx_gpu.h
index 6fb8c2f9b9e4..5070cb17d66c 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.h
+++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.h
@@ -45,6 +45,9 @@ struct a5xx_gpu {
atomic_t preempt_state;
struct timer_list preempt_timer;
+ struct a5xx_smmu_info *smmu_info;
+ struct drm_gem_object *smmu_info_bo;
+ uint64_t smmu_info_iova;
};
#define to_a5xx_gpu(x) container_of(x, struct a5xx_gpu, base)
@@ -128,6 +131,20 @@ struct a5xx_preempt_record {
*/
#define A5XX_PREEMPT_COUNTER_SIZE (16 * 4)
+/*
+ * This is a global structure that the preemption code uses to switch in the
+ * pagetable for the preempted process - the code switches in whatever we
+ * after preempting in a new ring.
+ */
+struct a5xx_smmu_info {
+ uint32_t magic;
+ uint32_t _pad4;
+ uint64_t ttbr0;
+ uint32_t asid;
+ uint32_t contextidr;
+};
+
+#define A5XX_SMMU_INFO_MAGIC 0x3618CDA3UL
int a5xx_power_init(struct msm_gpu *gpu);
void a5xx_gpmu_ucode_init(struct msm_gpu *gpu);
diff --git a/drivers/gpu/drm/msm/adreno/a5xx_preempt.c b/drivers/gpu/drm/msm/adreno/a5xx_preempt.c
index 970c7963ae29..8a6618f51eb8 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_preempt.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_preempt.c
@@ -12,6 +12,7 @@
*/
#include "msm_gem.h"
+#include "msm_mmu.h"
#include "a5xx_gpu.h"
/*
@@ -145,6 +146,15 @@ void a5xx_preempt_trigger(struct msm_gpu *gpu)
a5xx_gpu->preempt[ring->id]->wptr = get_wptr(ring);
spin_unlock_irqrestore(&ring->lock, flags);
+ /* Do read barrier to make sure we have updated pagetable info */
+ rmb();
+
+ /* Set the SMMU info for the preemption */
+ if (a5xx_gpu->smmu_info) {
+ a5xx_gpu->smmu_info->ttbr0 = ring->memptrs->ttbr0;
+ a5xx_gpu->smmu_info->contextidr = 0;
+ }
+
/* Set the address of the incoming preemption record */
gpu_write64(gpu, REG_A5XX_CP_CONTEXT_SWITCH_RESTORE_ADDR_LO,
REG_A5XX_CP_CONTEXT_SWITCH_RESTORE_ADDR_HI,
@@ -214,9 +224,10 @@ void a5xx_preempt_hw_init(struct msm_gpu *gpu)
a5xx_gpu->preempt[i]->rbase = gpu->rb[i]->iova;
}
- /* Write a 0 to signal that we aren't switching pagetables */
+ /* Tell the CP where to find the smmu_info buffer*/
gpu_write64(gpu, REG_A5XX_CP_CONTEXT_SWITCH_SMMU_INFO_LO,
- REG_A5XX_CP_CONTEXT_SWITCH_SMMU_INFO_HI, 0);
+ REG_A5XX_CP_CONTEXT_SWITCH_SMMU_INFO_HI,
+ a5xx_gpu->smmu_info_iova);
/* Reset the preemption state */
set_preempt_state(a5xx_gpu, PREEMPT_NONE);
@@ -275,8 +286,43 @@ void a5xx_preempt_fini(struct msm_gpu *gpu)
drm_gem_object_unreference(a5xx_gpu->preempt_bo[i]);
a5xx_gpu->preempt_bo[i] = NULL;
}
+
+ if (a5xx_gpu->smmu_info_bo) {
+ if (a5xx_gpu->smmu_info_iova)
+ msm_gem_put_iova(a5xx_gpu->smmu_info_bo, gpu->aspace);
+ drm_gem_object_unreference_unlocked(a5xx_gpu->smmu_info_bo);
+ a5xx_gpu->smmu_info_bo = NULL;
+ }
}
+static int a5xx_smmu_info_init(struct msm_gpu *gpu)
+{
+ struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
+ struct a5xx_gpu *a5xx_gpu = to_a5xx_gpu(adreno_gpu);
+ struct a5xx_smmu_info *ptr;
+ struct drm_gem_object *bo;
+ u64 iova;
+
+ if (!msm_mmu_has_feature(gpu->aspace->mmu,
+ MMU_FEATURE_PER_INSTANCE_TABLES))
+ return 0;
+
+ ptr = msm_gem_kernel_new(gpu->dev, sizeof(struct a5xx_smmu_info),
+ MSM_BO_UNCACHED, gpu->aspace, &bo, &iova);
+
+ if (IS_ERR(ptr))
+ return PTR_ERR(ptr);
+
+ ptr->magic = A5XX_SMMU_INFO_MAGIC;
+
+ a5xx_gpu->smmu_info_bo = bo;
+ a5xx_gpu->smmu_info_iova = iova;
+ a5xx_gpu->smmu_info = ptr;
+
+ return 0;
+}
+
+
void a5xx_preempt_init(struct msm_gpu *gpu)
{
struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
@@ -288,17 +334,21 @@ void a5xx_preempt_init(struct msm_gpu *gpu)
return;
for (i = 0; i < gpu->nr_rings; i++) {
- if (preempt_init_ring(a5xx_gpu, gpu->rb[i])) {
- /*
- * On any failure our adventure is over. Clean up and
- * set nr_rings to 1 to force preemption off
- */
- a5xx_preempt_fini(gpu);
- gpu->nr_rings = 1;
-
- return;
- }
+ if (preempt_init_ring(a5xx_gpu, gpu->rb[i]))
+ goto fail;
}
- timer_setup(&a5xx_gpu->preempt_timer, a5xx_preempt_timer, 0);
+ if (a5xx_smmu_info_init(gpu))
+ goto fail;
+
+ timer_setup(&a5xx_gpu->preempt_timer, a5xx_preempt_timer, 0);
+
+ return;
+fail:
+ /*
+ * On any failure our adventure is over. Clean up and
+ * set nr_rings to 1 to force preemption off
+ */
+ a5xx_preempt_fini(gpu);
+ gpu->nr_rings = 1;
}
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index de63ff26a062..cccd437e6ea3 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -552,6 +552,17 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
adreno_gpu_config.ioname = "kgsl_3d0_reg_memory";
adreno_gpu_config.irqname = "kgsl_3d0_irq";
+ if (adreno_is_a5xx(adreno_gpu)) {
+ /*
+ * If possible use the TTBR1 virtual address space for all the
+ * "global" buffer objects which are shared between processes.
+ * This leaves the lower virtual address space open for
+ * per-instance pagables if they are available
+ */
+ adreno_gpu_config.va_start_global = 0xfffffff800000000ULL;
+ adreno_gpu_config.va_end_global = 0xfffffff8ffffffffULL;
+ }
+
adreno_gpu_config.va_start = SZ_16M;
adreno_gpu_config.va_end = 0xffffffff;
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.h b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
index 8d3d0a924908..1b2021c884f7 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.h
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
@@ -197,6 +197,11 @@ static inline int adreno_is_a530(struct adreno_gpu *gpu)
return gpu->revn == 530;
}
+static inline bool adreno_is_a5xx(struct adreno_gpu *gpu)
+{
+ return ((gpu->revn >= 500) & (gpu->revn < 600));
+}
+
int adreno_get_param(struct msm_gpu *gpu, uint32_t param, uint64_t *value);
const struct firmware *adreno_request_fw(struct adreno_gpu *adreno_gpu,
const char *fwname);
diff --git a/drivers/gpu/drm/msm/msm_ringbuffer.h b/drivers/gpu/drm/msm/msm_ringbuffer.h
index cffce094aecb..fd71484d5894 100644
--- a/drivers/gpu/drm/msm/msm_ringbuffer.h
+++ b/drivers/gpu/drm/msm/msm_ringbuffer.h
@@ -26,6 +26,7 @@
struct msm_rbmemptrs {
volatile uint32_t rptr;
volatile uint32_t fence;
+ volatile uint64_t ttbr0;
};
struct msm_ringbuffer {
--
2.16.1
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