linux-kernel - [PATCH v1 06/13] gpu: host1x: Program virtualization tables

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Message-Id: <20220516100213.1536571-7-cyndis@kapsi.fi>
Date:   Mon, 16 May 2022 13:02:06 +0300
From:   cyndis@...si.fi
To:     thierry.reding@...il.com, jonathanh@...dia.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, digetx@...il.com
Cc:     dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mikko Perttunen <mperttunen@...dia.com>
Subject: [PATCH v1 06/13] gpu: host1x: Program virtualization tables

From: Mikko Perttunen <mperttunen@...dia.com>

Program virtualization tables specifying which VMs have access to which
Host1x hardware resources. Programming these has become mandatory in
Tegra234.

For now, since the driver does not operate as a Host1x hypervisor, we
basically allow access to everything to everyone.

Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
---
 drivers/gpu/host1x/dev.c | 21 ++++++++++++++++++---
 drivers/gpu/host1x/dev.h |  8 ++++++++
 2 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c
index 8c6ce8014c09..5a57165ab0f6 100644
--- a/drivers/gpu/host1x/dev.c
+++ b/drivers/gpu/host1x/dev.c
@@ -217,7 +217,7 @@ static const struct of_device_id host1x_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, host1x_of_match);
 
-static void host1x_setup_sid_table(struct host1x *host)
+static void host1x_setup_virtualization_tables(struct host1x *host)
 {
 	const struct host1x_info *info = host->info;
 	unsigned int i;
@@ -231,6 +231,21 @@ static void host1x_setup_sid_table(struct host1x *host)
 		host1x_hypervisor_writel(host, entry->offset, entry->base);
 		host1x_hypervisor_writel(host, entry->limit, entry->base + 4);
 	}
+
+	for (i = 0; i < info->streamid_vm_table.count; i++) {
+		/* Allow access to all stream IDs to all VMs. */
+		host1x_hypervisor_writel(host, 0xff, info->streamid_vm_table.base + 4 * i);
+	}
+
+	for (i = 0; i < info->classid_vm_table.count; i++) {
+		/* Allow access to all classes to all VMs. */
+		host1x_hypervisor_writel(host, 0xff, info->classid_vm_table.base + 4 * i);
+	}
+
+	for (i = 0; i < info->mmio_vm_table.count; i++) {
+		/* Use VM1 (that's us) as originator VMID for engine MMIO accesses. */
+		host1x_hypervisor_writel(host, 0x1, info->mmio_vm_table.base + 4 * i);
+	}
 }
 
 static bool host1x_wants_iommu(struct host1x *host1x)
@@ -602,7 +617,7 @@ static int __maybe_unused host1x_runtime_suspend(struct device *dev)
 	return 0;
 
 resume_host1x:
-	host1x_setup_sid_table(host);
+	host1x_setup_virtualization_tables(host);
 	host1x_syncpt_restore(host);
 	host1x_intr_start(host);
 
@@ -632,7 +647,7 @@ static int __maybe_unused host1x_runtime_resume(struct device *dev)
 		goto disable_clk;
 	}
 
-	host1x_setup_sid_table(host);
+	host1x_setup_virtualization_tables(host);
 	host1x_syncpt_restore(host);
 	host1x_intr_start(host);
 
diff --git a/drivers/gpu/host1x/dev.h b/drivers/gpu/host1x/dev.h
index 85edcc6e0fc7..920e5548cfbc 100644
--- a/drivers/gpu/host1x/dev.h
+++ b/drivers/gpu/host1x/dev.h
@@ -90,6 +90,11 @@ struct host1x_sid_entry {
 	unsigned int limit;
 };
 
+struct host1x_table_desc {
+	unsigned int base;
+	unsigned int count;
+};
+
 struct host1x_info {
 	unsigned int nb_channels; /* host1x: number of channels supported */
 	unsigned int nb_pts; /* host1x: number of syncpoints supported */
@@ -103,6 +108,9 @@ struct host1x_info {
 	bool has_common; /* has common registers separate from hypervisor */
 	unsigned int num_sid_entries;
 	const struct host1x_sid_entry *sid_table;
+	struct host1x_table_desc streamid_vm_table;
+	struct host1x_table_desc classid_vm_table;
+	struct host1x_table_desc mmio_vm_table;
 	/*
 	 * On T20-T148, the boot chain may setup DC to increment syncpoints
 	 * 26/27 on VBLANK. As such we cannot use these syncpoints until
-- 
2.36.1