1 files changed, 187 insertions, 2 deletions

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.h b/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
index 34822b080759..9201a53dd341 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
@@ -12,6 +12,41 @@
 
 extern bool hang_debug;
 
+struct cpu_gpu_lock {
+	uint32_t gpu_req;
+	uint32_t cpu_req;
+	uint32_t turn;
+	union {
+		struct {
+			uint16_t list_length;
+			uint16_t list_offset;
+		};
+		struct {
+			uint8_t ifpc_list_len;
+			uint8_t preemption_list_len;
+			uint16_t dynamic_list_len;
+		};
+	};
+	uint64_t regs[62];
+};
+
+/**
+ * struct a6xx_info - a6xx specific information from device table
+ *
+ * @hwcg: hw clock gating register sequence
+ * @protect: CP_PROTECT settings
+ * @pwrup_reglist pwrup reglist for preemption
+ */
+struct a6xx_info {
+	const struct adreno_reglist *hwcg;
+	const struct adreno_protect *protect;
+	const struct adreno_reglist_list *pwrup_reglist;
+	u32 gmu_chipid;
+	u32 gmu_cgc_mode;
+	u32 prim_fifo_threshold;
+	const struct a6xx_bcm *bcms;
+};
+
 struct a6xx_gpu {
 	struct adreno_gpu base;
 
@@ -19,6 +54,29 @@ struct a6xx_gpu {
 	uint64_t sqe_iova;
 
 	struct msm_ringbuffer *cur_ring;
+	struct msm_ringbuffer *next_ring;
+
+	struct drm_gem_object *preempt_bo[MSM_GPU_MAX_RINGS];
+	void *preempt[MSM_GPU_MAX_RINGS];
+	uint64_t preempt_iova[MSM_GPU_MAX_RINGS];
+	struct drm_gem_object *preempt_smmu_bo[MSM_GPU_MAX_RINGS];
+	void *preempt_smmu[MSM_GPU_MAX_RINGS];
+	uint64_t preempt_smmu_iova[MSM_GPU_MAX_RINGS];
+	uint32_t last_seqno[MSM_GPU_MAX_RINGS];
+
+	atomic_t preempt_state;
+	spinlock_t eval_lock;
+	struct timer_list preempt_timer;
+
+	unsigned int preempt_level;
+	bool uses_gmem;
+	bool skip_save_restore;
+
+	struct drm_gem_object *preempt_postamble_bo;
+	void *preempt_postamble_ptr;
+	uint64_t preempt_postamble_iova;
+	uint64_t preempt_postamble_len;
+	bool postamble_enabled;
 
 	struct a6xx_gmu gmu;
 
@@ -26,6 +84,11 @@ struct a6xx_gpu {
 	uint64_t shadow_iova;
 	uint32_t *shadow;
 
+	struct drm_gem_object *pwrup_reglist_bo;
+	void *pwrup_reglist_ptr;
+	uint64_t pwrup_reglist_iova;
+	bool pwrup_reglist_emitted;
+
 	bool has_whereami;
 
 	void __iomem *llc_mmio;
@@ -38,6 +101,100 @@ struct a6xx_gpu {
 #define to_a6xx_gpu(x) container_of(x, struct a6xx_gpu, base)
 
 /*
+ * In order to do lockless preemption we use a simple state machine to progress
+ * through the process.
+ *
+ * PREEMPT_NONE - no preemption in progress.  Next state START.
+ * PREEMPT_START - The trigger is evaluating if preemption is possible. Next
+ * states: TRIGGERED, NONE
+ * PREEMPT_FINISH - An intermediate state before moving back to NONE. Next
+ * state: NONE.
+ * PREEMPT_TRIGGERED: A preemption has been executed on the hardware. Next
+ * states: FAULTED, PENDING
+ * PREEMPT_FAULTED: A preemption timed out (never completed). This will trigger
+ * recovery.  Next state: N/A
+ * PREEMPT_PENDING: Preemption complete interrupt fired - the callback is
+ * checking the success of the operation. Next state: FAULTED, NONE.
+ */
+
+enum a6xx_preempt_state {
+	PREEMPT_NONE = 0,
+	PREEMPT_START,
+	PREEMPT_FINISH,
+	PREEMPT_TRIGGERED,
+	PREEMPT_FAULTED,
+	PREEMPT_PENDING,
+};
+
+/*
+ * struct a6xx_preempt_record is a shared buffer between the microcode and the
+ * CPU to store the state for preemption. The record itself is much larger
+ * (2112k) but most of that is used by the CP for storage.
+ *
+ * There is a preemption record assigned per ringbuffer. When the CPU triggers a
+ * preemption, it fills out the record with the useful information (wptr, ring
+ * base, etc) and the microcode uses that information to set up the CP following
+ * the preemption.  When a ring is switched out, the CP will save the ringbuffer
+ * state back to the record. In this way, once the records are properly set up
+ * the CPU can quickly switch back and forth between ringbuffers by only
+ * updating a few registers (often only the wptr).
+ *
+ * These are the CPU aware registers in the record:
+ * @magic: Must always be 0xAE399D6EUL
+ * @info: Type of the record - written 0 by the CPU, updated by the CP
+ * @errno: preemption error record
+ * @data: Data field in YIELD and SET_MARKER packets, Written and used by CP
+ * @cntl: Value of RB_CNTL written by CPU, save/restored by CP
+ * @rptr: Value of RB_RPTR written by CPU, save/restored by CP
+ * @wptr: Value of RB_WPTR written by CPU, save/restored by CP
+ * @_pad: Reserved/padding
+ * @rptr_addr: Value of RB_RPTR_ADDR_LO|HI written by CPU, save/restored by CP
+ * @rbase: Value of RB_BASE written by CPU, save/restored by CP
+ * @counter: GPU address of the storage area for the preemption counters
+ * @bv_rptr_addr: Value of BV_RB_RPTR_ADDR_LO|HI written by CPU, save/restored by CP
+ */
+struct a6xx_preempt_record {
+	u32 magic;
+	u32 info;
+	u32 errno;
+	u32 data;
+	u32 cntl;
+	u32 rptr;
+	u32 wptr;
+	u32 _pad;
+	u64 rptr_addr;
+	u64 rbase;
+	u64 counter;
+	u64 bv_rptr_addr;
+};
+
+#define A6XX_PREEMPT_RECORD_MAGIC 0xAE399D6EUL
+
+#define PREEMPT_SMMU_INFO_SIZE 4096
+
+#define PREEMPT_RECORD_SIZE(adreno_gpu) \
+	((adreno_gpu->info->preempt_record_size) == 0 ? \
+	 4192 * SZ_1K : (adreno_gpu->info->preempt_record_size))
+
+/*
+ * The preemption counter block is a storage area for the value of the
+ * preemption counters that are saved immediately before context switch. We
+ * append it on to the end of the allocation for the preemption record.
+ */
+#define A6XX_PREEMPT_COUNTER_SIZE (16 * 4)
+
+struct a7xx_cp_smmu_info {
+	u32 magic;
+	u32 _pad4;
+	u64 ttbr0;
+	u32 asid;
+	u32 context_idr;
+	u32 context_bank;
+};
+
+#define GEN7_CP_SMMU_INFO_MAGIC 0x241350d5UL
+
+/*
  * Given a register and a count, return a value to program into
  * REG_CP_PROTECT_REG(n) - this will block both reads and writes for
  * _len + 1 registers starting at _reg.
@@ -69,12 +226,12 @@ static inline void a6xx_llc_rmw(struct a6xx_gpu *a6xx_gpu, u32 reg, u32 mask, u3
 
 static inline u32 a6xx_llc_read(struct a6xx_gpu *a6xx_gpu, u32 reg)
 {
-	return msm_readl(a6xx_gpu->llc_mmio + (reg << 2));
+	return readl(a6xx_gpu->llc_mmio + (reg << 2));
 }
 
 static inline void a6xx_llc_write(struct a6xx_gpu *a6xx_gpu, u32 reg, u32 value)
 {
-	msm_writel(value, a6xx_gpu->llc_mmio + (reg << 2));
+	writel(value, a6xx_gpu->llc_mmio + (reg << 2));
 }
 
 #define shadowptr(_a6xx_gpu, _ring) ((_a6xx_gpu)->shadow_iova + \
@@ -94,6 +251,34 @@ int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node);
 int a6xx_gmu_wrapper_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node);
 void a6xx_gmu_remove(struct a6xx_gpu *a6xx_gpu);
 
+void a6xx_preempt_init(struct msm_gpu *gpu);
+void a6xx_preempt_hw_init(struct msm_gpu *gpu);
+void a6xx_preempt_trigger(struct msm_gpu *gpu);
+void a6xx_preempt_irq(struct msm_gpu *gpu);
+void a6xx_preempt_fini(struct msm_gpu *gpu);
+int a6xx_preempt_submitqueue_setup(struct msm_gpu *gpu,
+		struct msm_gpu_submitqueue *queue);
+void a6xx_preempt_submitqueue_close(struct msm_gpu *gpu,
+		struct msm_gpu_submitqueue *queue);
+
+/* Return true if we are in a preempt state */
+static inline bool a6xx_in_preempt(struct a6xx_gpu *a6xx_gpu)
+{
+	/*
+	 * Make sure the read to preempt_state is ordered with respect to reads
+	 * of other variables before ...
+	 */
+	smp_rmb();
+
+	int preempt_state = atomic_read(&a6xx_gpu->preempt_state);
+
+	/* ... and after. */
+	smp_rmb();
+
+	return !(preempt_state == PREEMPT_NONE ||
+			preempt_state == PREEMPT_FINISH);
+}
+
 void a6xx_gmu_set_freq(struct msm_gpu *gpu, struct dev_pm_opp *opp,
 		       bool suspended);
 unsigned long a6xx_gmu_get_freq(struct msm_gpu *gpu);