Merge tag 'misc-habanalabs-fixes-2020-06-24' of git://people.freedesktop.org/~gabbayo/linux into char-misc-linus

Oded writes:

This tag contains the following fixes for kernel 5.8-rc2:

- close security hole in GAUDI command buffer parsing by blocking an
  instruction that might allow user to run command buffer that wasn't
  parsed on a secured engine.

- Fix bug in GAUDI MMU cache invalidation code.

- Rename a function to resolve conflict with a static inline function in
  arch/m68k/include/asm/mcfmmu.h

- Increase watchdog timeout of GAUDI QMAN arbitration H/W to prevent false
  reports on timeouts

- Fix bug of dereferencing NULL pointer when an error occurs during command
  submission

- Increase H/W timer for checking if PDMA engine is IDLE in GAUDI.

* tag 'misc-habanalabs-fixes-2020-06-24' of git://people.freedesktop.org/~gabbayo/linux:
  habanalabs: increase h/w timer when checking idle
  habanalabs: Correct handling when failing to enqueue CB
  habanalabs: increase GAUDI QMAN ARB WDT timeout
  habanalabs: rename mmu_write() to mmu_asid_va_write()
  habanalabs: use PI in MMU cache invalidation
  habanalabs: block scalar load_and_exe on external queue

Author: gregkh

drivers/misc/habanalabs/command_submission.c

@@ -62,6 +62,12 @@ static void hl_fence_release(struct dma_fence *fence)
 		container_of(fence, struct hl_cs_compl, base_fence);
 	struct hl_device *hdev = hl_cs_cmpl->hdev;
 
+	/* EBUSY means the CS was never submitted and hence we don't have
+	 * an attached hw_sob object that we should handle here
+	 */
+	if (fence->error == -EBUSY)
+		goto free;
+
 	if ((hl_cs_cmpl->type == CS_TYPE_SIGNAL) ||
 			(hl_cs_cmpl->type == CS_TYPE_WAIT)) {
 
@@ -92,6 +98,7 @@ static void hl_fence_release(struct dma_fence *fence)
 		kref_put(&hl_cs_cmpl->hw_sob->kref, hl_sob_reset);
 	}
 
+free:
 	kfree_rcu(hl_cs_cmpl, base_fence.rcu);
 }
 
@@ -328,10 +335,16 @@ static void cs_do_release(struct kref *ref)
 
 	hl_ctx_put(cs->ctx);
 
+	/* We need to mark an error for not submitted because in that case
+	 * the dma fence release flow is different. Mainly, we don't need
+	 * to handle hw_sob for signal/wait
+	 */
 	if (cs->timedout)
 		dma_fence_set_error(cs->fence, -ETIMEDOUT);
 	else if (cs->aborted)
 		dma_fence_set_error(cs->fence, -EIO);
+	else if (!cs->submitted)
+		dma_fence_set_error(cs->fence, -EBUSY);
 
 	dma_fence_signal(cs->fence);
 	dma_fence_put(cs->fence);

drivers/misc/habanalabs/debugfs.c

@@ -480,7 +480,7 @@ static int mmu_show(struct seq_file *s, void *data)
 	return 0;
 }
 
-static ssize_t mmu_write(struct file *file, const char __user *buf,
+static ssize_t mmu_asid_va_write(struct file *file, const char __user *buf,
 		size_t count, loff_t *f_pos)
 {
 	struct seq_file *s = file->private_data;
@@ -1125,7 +1125,7 @@ static const struct hl_info_list hl_debugfs_list[] = {
 	{"command_submission_jobs", command_submission_jobs_show, NULL},
 	{"userptr", userptr_show, NULL},
 	{"vm", vm_show, NULL},
-	{"mmu", mmu_show, mmu_write},
+	{"mmu", mmu_show, mmu_asid_va_write},
 	{"engines", engines_show, NULL}
 };
 

drivers/misc/habanalabs/gaudi/gaudi.c

@@ -96,7 +96,7 @@
 
 #define GAUDI_NUM_OF_QM_ARB_ERR_CAUSE	3
 
-#define GAUDI_ARB_WDT_TIMEOUT		0x400000
+#define GAUDI_ARB_WDT_TIMEOUT		0x1000000
 
 static const char gaudi_irq_name[GAUDI_MSI_ENTRIES][GAUDI_MAX_STRING_LEN] = {
 		"gaudi cq 0_0", "gaudi cq 0_1", "gaudi cq 0_2", "gaudi cq 0_3",
@@ -1893,6 +1893,8 @@ static void gaudi_init_pci_dma_qman(struct hl_device *hdev, int dma_id,
 	WREG32(mmDMA0_QM_CP_MSG_BASE3_ADDR_LO_0 + q_off, so_base_ws_lo);
 	WREG32(mmDMA0_QM_CP_MSG_BASE3_ADDR_HI_0 + q_off, so_base_ws_hi);
 
+	WREG32(mmDMA0_QM_CP_BARRIER_CFG_0 + q_off, 0x100);
+
 	/* The following configuration is needed only once per QMAN */
 	if (qman_id == 0) {
 		/* Configure RAZWI IRQ */
@@ -2725,6 +2727,12 @@ static int gaudi_mmu_init(struct hl_device *hdev)
 	WREG32(mmSTLB_HOP_CONFIGURATION,
 			hdev->mmu_huge_page_opt ? 0x30440 : 0x40440);
 
+	/*
+	 * The H/W expects the first PI after init to be 1. After wraparound
+	 * we'll write 0.
+	 */
+	gaudi->mmu_cache_inv_pi = 1;
+
 	gaudi->hw_cap_initialized |= HW_CAP_MMU;
 
 	return 0;
@@ -3790,6 +3798,25 @@ static int gaudi_validate_dma_pkt_no_mmu(struct hl_device *hdev,
 						src_in_host);
 }
 
+static int gaudi_validate_load_and_exe_pkt(struct hl_device *hdev,
+					struct hl_cs_parser *parser,
+					struct packet_load_and_exe *user_pkt)
+{
+	u32 cfg;
+
+	cfg = le32_to_cpu(user_pkt->cfg);
+
+	if (cfg & GAUDI_PKT_LOAD_AND_EXE_CFG_DST_MASK) {
+		dev_err(hdev->dev,
+			"User not allowed to use Load and Execute\n");
+		return -EPERM;
+	}
+
+	parser->patched_cb_size += sizeof(struct packet_load_and_exe);
+
+	return 0;
+}
+
 static int gaudi_validate_cb(struct hl_device *hdev,
 			struct hl_cs_parser *parser, bool is_mmu)
 {
@@ -3838,6 +3865,11 @@ static int gaudi_validate_cb(struct hl_device *hdev,
 			rc = -EPERM;
 			break;
 
+		case PACKET_LOAD_AND_EXE:
+			rc = gaudi_validate_load_and_exe_pkt(hdev, parser,
+				(struct packet_load_and_exe *) user_pkt);
+			break;
+
 		case PACKET_LIN_DMA:
 			parser->contains_dma_pkt = true;
 			if (is_mmu)
@@ -3855,7 +3887,6 @@ static int gaudi_validate_cb(struct hl_device *hdev,
 		case PACKET_FENCE:
 		case PACKET_NOP:
 		case PACKET_ARB_POINT:
-		case PACKET_LOAD_AND_EXE:
 			parser->patched_cb_size += pkt_size;
 			break;
 
@@ -5994,6 +6025,8 @@ static int gaudi_mmu_invalidate_cache(struct hl_device *hdev, bool is_hard,
 	mutex_lock(&hdev->mmu_cache_lock);
 
 	/* L0 & L1 invalidation */
+	WREG32(mmSTLB_INV_PS, 3);
+	WREG32(mmSTLB_CACHE_INV, gaudi->mmu_cache_inv_pi++);
 	WREG32(mmSTLB_INV_PS, 2);
 
 	rc = hl_poll_timeout(

drivers/misc/habanalabs/gaudi/gaudiP.h

@@ -229,6 +229,8 @@ struct gaudi_internal_qman_info {
  * @multi_msi_mode: whether we are working in multi MSI single MSI mode.
  *                  Multi MSI is possible only with IOMMU enabled.
  * @ext_queue_idx: helper index for external queues initialization.
+ * @mmu_cache_inv_pi: PI for MMU cache invalidation flow. The H/W expects an
+ *                    8-bit value so use u8.
  */
 struct gaudi_device {
 	int (*armcp_info_get)(struct hl_device *hdev);
@@ -248,6 +250,7 @@ struct gaudi_device {
 	u32				hw_cap_initialized;
 	u8				multi_msi_mode;
 	u8				ext_queue_idx;
+	u8				mmu_cache_inv_pi;
 };
 
 void gaudi_init_security(struct hl_device *hdev);

drivers/misc/habanalabs/include/gaudi/gaudi_packets.h

@@ -197,6 +197,9 @@ struct packet_wait {
 	__le32 ctl;
 };
 
+#define GAUDI_PKT_LOAD_AND_EXE_CFG_DST_SHIFT	0
+#define GAUDI_PKT_LOAD_AND_EXE_CFG_DST_MASK	0x00000001
+
 struct packet_load_and_exe {
 	__le32 cfg;
 	__le32 ctl;