[PATCH v2 0/8] Host1x context isolation support

STALE1760d SUPERSEDED

Revision v2 of 3 in this series.

17 messages, 5 authors, 2021-12-17 · open the first message on its own page

[PATCH v2 0/8] Host1x context isolation support

From: Mikko Perttunen <mperttunen@nvidia.com>
Date: 2021-09-16 14:34:10

Hi all,

***
New in v2:

Added support for Tegra194
Use standard iommu-map property instead of custom mechanism
***

this series adds support for Host1x 'context isolation'. Since
when programming engines through Host1x, userspace can program in
any addresses it wants, we need some way to isolate the engines'
memory spaces. Traditionally this has either been done imperfectly
with a single shared IOMMU domain, or by copying and verifying the
programming command stream at submit time (Host1x firewall).

Since Tegra186 there is a privileged (only usable by kernel)
Host1x opcode that allows setting the stream ID sent by the engine
to the SMMU. So, by allocating a number of context banks and stream
IDs for this purpose, and using this opcode at the beginning of
each job, we can implement isolation. Due to the limited number of
context banks only each process gets its own context, and not
each channel.

This feature also allows sharing engines among multiple VMs when
used with Host1x's hardware virtualization support - up to 8 VMs
can be configured with a subset of allowed stream IDs, enforced
at hardware level.

To implement this, this series adds a new host1x context bus, which
will contain the 'struct device's corresponding to each context
bank / stream ID, changes to device tree and SMMU code to allow
registering the devices and using the bus, as well as the Host1x
stream ID programming code and support in TegraDRM.

Device tree bindings are not updated yet pending consensus that the
proposed changes make sense.

Thanks,
Mikko

Mikko Perttunen (8):
  gpu: host1x: Add context bus
  gpu: host1x: Add context device management code
  gpu: host1x: Program context stream ID on submission
  iommu/arm-smmu: Attach to host1x context device bus
  arm64: tegra: Add Host1x context stream IDs on Tegra186+
  drm/tegra: falcon: Set DMACTX field on DMA transactions
  drm/tegra: vic: Implement get_streamid_offset
  drm/tegra: Support context isolation

 arch/arm64/boot/dts/nvidia/tegra186.dtsi  |  12 ++
 arch/arm64/boot/dts/nvidia/tegra194.dtsi  |  12 ++
 drivers/gpu/Makefile                      |   3 +-
 drivers/gpu/drm/tegra/drm.h               |   2 +
 drivers/gpu/drm/tegra/falcon.c            |   8 +
 drivers/gpu/drm/tegra/falcon.h            |   1 +
 drivers/gpu/drm/tegra/submit.c            |  13 ++
 drivers/gpu/drm/tegra/uapi.c              |  34 ++++-
 drivers/gpu/drm/tegra/vic.c               |  38 +++++
 drivers/gpu/host1x/Kconfig                |   5 +
 drivers/gpu/host1x/Makefile               |   2 +
 drivers/gpu/host1x/context.c              | 174 ++++++++++++++++++++++
 drivers/gpu/host1x/context.h              |  27 ++++
 drivers/gpu/host1x/context_bus.c          |  31 ++++
 drivers/gpu/host1x/dev.c                  |  12 +-
 drivers/gpu/host1x/dev.h                  |   2 +
 drivers/gpu/host1x/hw/channel_hw.c        |  52 ++++++-
 drivers/gpu/host1x/hw/host1x06_hardware.h |  10 ++
 drivers/gpu/host1x/hw/host1x07_hardware.h |  10 ++
 drivers/iommu/arm/arm-smmu/arm-smmu.c     |  13 ++
 include/linux/host1x.h                    |  21 +++
 include/linux/host1x_context_bus.h        |  15 ++
 22 files changed, 488 insertions(+), 9 deletions(-)
 create mode 100644 drivers/gpu/host1x/context.c
 create mode 100644 drivers/gpu/host1x/context.h
 create mode 100644 drivers/gpu/host1x/context_bus.c
 create mode 100644 include/linux/host1x_context_bus.h

-- 
2.32.0


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[PATCH v2 3/8] gpu: host1x: Program context stream ID on submission

From: Mikko Perttunen <mperttunen@nvidia.com>
Date: 2021-09-16 14:33:36

Add code to do stream ID switching at the beginning of a job. The
stream ID is switched to the stream ID specified by the context
passed in the job structure.

Before switching the stream ID, an OP_DONE wait is done on the
channel's engine to ensure that there is no residual ongoing
work that might do DMA using the new stream ID.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
---
 drivers/gpu/host1x/hw/channel_hw.c        | 52 +++++++++++++++++++++--
 drivers/gpu/host1x/hw/host1x06_hardware.h | 10 +++++
 drivers/gpu/host1x/hw/host1x07_hardware.h | 10 +++++
 include/linux/host1x.h                    |  4 ++
 4 files changed, 72 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/host1x/hw/channel_hw.c b/drivers/gpu/host1x/hw/channel_hw.c
index 1999780a7203..d451f8437f62 100644
--- a/drivers/gpu/host1x/hw/channel_hw.c
+++ b/drivers/gpu/host1x/hw/channel_hw.c

@@ -159,6 +159,45 @@ static void host1x_channel_set_streamid(struct host1x_channel *channel)
 #endif
 }
 
+static void host1x_channel_program_engine_streamid(struct host1x_job *job)
+{
+#if HOST1X_HW >= 6
+	u32 fence;
+
+	if (!job->context)
+		return;
+
+	fence = host1x_syncpt_incr_max(job->syncpt, 1);
+
+	/* First, increment a syncpoint on OP_DONE condition.. */
+
+	host1x_cdma_push(&job->channel->cdma,
+		host1x_opcode_nonincr(HOST1X_UCLASS_INCR_SYNCPT, 1),
+		HOST1X_UCLASS_INCR_SYNCPT_INDX_F(job->syncpt->id) |
+			HOST1X_UCLASS_INCR_SYNCPT_COND_F(1));
+
+	/* Wait for syncpoint to increment */
+
+	host1x_cdma_push(&job->channel->cdma,
+		host1x_opcode_setclass(HOST1X_CLASS_HOST1X,
+			host1x_uclass_wait_syncpt_r(), 1),
+		host1x_class_host_wait_syncpt(job->syncpt->id, fence));
+
+	/*
+	 * Now that we know the engine is idle, return to class and
+	 * change stream ID.
+	 */
+
+	host1x_cdma_push(&job->channel->cdma,
+		host1x_opcode_setclass(job->class, 0, 0),
+		HOST1X_OPCODE_NOP);
+
+	host1x_cdma_push(&job->channel->cdma,
+		host1x_opcode_setpayload(job->context->stream_id),
+		host1x_opcode_setstreamid(job->engine_streamid_offset / 4));
+#endif
+}
+
 static int channel_submit(struct host1x_job *job)
 {
 	struct host1x_channel *ch = job->channel;

@@ -214,18 +253,23 @@ static int channel_submit(struct host1x_job *job)
 	if (sp->base)
 		synchronize_syncpt_base(job);
 
-	syncval = host1x_syncpt_incr_max(sp, user_syncpt_incrs);
-
 	host1x_hw_syncpt_assign_to_channel(host, sp, ch);
 
-	job->syncpt_end = syncval;
-
 	/* add a setclass for modules that require it */
 	if (job->class)
 		host1x_cdma_push(&ch->cdma,
 				 host1x_opcode_setclass(job->class, 0, 0),
 				 HOST1X_OPCODE_NOP);
 
+	/*
+	 * Ensure engine DMA is idle and set new stream ID. May increment
+	 * syncpt max.
+	 */
+	host1x_channel_program_engine_streamid(job);
+
+	syncval = host1x_syncpt_incr_max(sp, user_syncpt_incrs);
+	job->syncpt_end = syncval;
+
 	submit_gathers(job, syncval - user_syncpt_incrs);
 
 	/* end CDMA submit & stash pinned hMems into sync queue */

diff --git a/drivers/gpu/host1x/hw/host1x06_hardware.h b/drivers/gpu/host1x/hw/host1x06_hardware.h
index 01a142a09800..5d515745eee7 100644
--- a/drivers/gpu/host1x/hw/host1x06_hardware.h
+++ b/drivers/gpu/host1x/hw/host1x06_hardware.h

@@ -127,6 +127,16 @@ static inline u32 host1x_opcode_gather_incr(unsigned offset, unsigned count)
 	return (6 << 28) | (offset << 16) | BIT(15) | BIT(14) | count;
 }
 
+static inline u32 host1x_opcode_setstreamid(unsigned streamid)
+{
+	return (7 << 28) | streamid;
+}
+
+static inline u32 host1x_opcode_setpayload(unsigned payload)
+{
+	return (9 << 28) | payload;
+}
+
 static inline u32 host1x_opcode_gather_wide(unsigned count)
 {
 	return (12 << 28) | count;

diff --git a/drivers/gpu/host1x/hw/host1x07_hardware.h b/drivers/gpu/host1x/hw/host1x07_hardware.h
index e6582172ebfd..82c0cc9bb0b5 100644
--- a/drivers/gpu/host1x/hw/host1x07_hardware.h
+++ b/drivers/gpu/host1x/hw/host1x07_hardware.h

@@ -127,6 +127,16 @@ static inline u32 host1x_opcode_gather_incr(unsigned offset, unsigned count)
 	return (6 << 28) | (offset << 16) | BIT(15) | BIT(14) | count;
 }
 
+static inline u32 host1x_opcode_setstreamid(unsigned streamid)
+{
+	return (7 << 28) | streamid;
+}
+
+static inline u32 host1x_opcode_setpayload(unsigned payload)
+{
+	return (9 << 28) | payload;
+}
+
 static inline u32 host1x_opcode_gather_wide(unsigned count)
 {
 	return (12 << 28) | count;

diff --git a/include/linux/host1x.h b/include/linux/host1x.h
index f3073738564a..eb0ca304ca92 100644
--- a/include/linux/host1x.h
+++ b/include/linux/host1x.h

@@ -277,6 +277,10 @@ struct host1x_job {
 
 	/* Whether host1x-side firewall should be ran for this job or not */
 	bool enable_firewall;
+
+	/* Options for configuring engine data stream ID */
+	struct host1x_context *context;
+	u32 engine_streamid_offset;
 };
 
 struct host1x_job *host1x_job_alloc(struct host1x_channel *ch,

-- 
2.32.0


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[PATCH v2 1/8] gpu: host1x: Add context bus

From: Mikko Perttunen <mperttunen@nvidia.com>
Date: 2021-09-16 14:33:36

The context bus is a "dummy" bus that contains struct devices that
correspond to IOMMU contexts assigned through Host1x to processes.

Even when host1x itself is built as a module, the bus is registered
in built-in code so that the built-in ARM SMMU driver is able to
reference it.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
---
 drivers/gpu/Makefile               |  3 +--
 drivers/gpu/host1x/Kconfig         |  5 +++++
 drivers/gpu/host1x/Makefile        |  1 +
 drivers/gpu/host1x/context_bus.c   | 31 ++++++++++++++++++++++++++++++
 include/linux/host1x_context_bus.h | 15 +++++++++++++++
 5 files changed, 53 insertions(+), 2 deletions(-)
 create mode 100644 drivers/gpu/host1x/context_bus.c
 create mode 100644 include/linux/host1x_context_bus.h

diff --git a/drivers/gpu/Makefile b/drivers/gpu/Makefile
index 835c88318cec..8997f0096545 100644
--- a/drivers/gpu/Makefile
+++ b/drivers/gpu/Makefile

@@ -2,7 +2,6 @@
 # drm/tegra depends on host1x, so if both drivers are built-in care must be
 # taken to initialize them in the correct order. Link order is the only way
 # to ensure this currently.
-obj-$(CONFIG_TEGRA_HOST1X)	+= host1x/
-obj-y			+= drm/ vga/
+obj-y			+= host1x/ drm/ vga/
 obj-$(CONFIG_IMX_IPUV3_CORE)	+= ipu-v3/
 obj-$(CONFIG_TRACE_GPU_MEM)		+= trace/

diff --git a/drivers/gpu/host1x/Kconfig b/drivers/gpu/host1x/Kconfig
index 6dab94adf25e..8546dde3acc8 100644
--- a/drivers/gpu/host1x/Kconfig
+++ b/drivers/gpu/host1x/Kconfig

@@ -1,7 +1,12 @@
 # SPDX-License-Identifier: GPL-2.0-only
+
+config TEGRA_HOST1X_CONTEXT_BUS
+	bool
+
 config TEGRA_HOST1X
 	tristate "NVIDIA Tegra host1x driver"
 	depends on ARCH_TEGRA || (ARM && COMPILE_TEST)
+	select TEGRA_HOST1X_CONTEXT_BUS
 	select IOMMU_IOVA
 	help
 	  Driver for the NVIDIA Tegra host1x hardware.

diff --git a/drivers/gpu/host1x/Makefile b/drivers/gpu/host1x/Makefile
index d2b6f7de0498..c891a3e33844 100644
--- a/drivers/gpu/host1x/Makefile
+++ b/drivers/gpu/host1x/Makefile

@@ -18,3 +18,4 @@ host1x-y = \
 	hw/host1x07.o
 
 obj-$(CONFIG_TEGRA_HOST1X) += host1x.o
+obj-$(CONFIG_TEGRA_HOST1X_CONTEXT_BUS) += context_bus.o

diff --git a/drivers/gpu/host1x/context_bus.c b/drivers/gpu/host1x/context_bus.c
new file mode 100644
index 000000000000..2625914f3c7d
--- /dev/null
+++ b/drivers/gpu/host1x/context_bus.c

@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021, NVIDIA Corporation.
+ */
+
+#include <linux/device.h>
+#include <linux/of.h>
+
+struct bus_type host1x_context_device_bus_type = {
+	.name = "host1x-context",
+};
+EXPORT_SYMBOL(host1x_context_device_bus_type);
+
+static int __init host1x_context_device_bus_init(void)
+{
+	int err;
+
+	if (!of_machine_is_compatible("nvidia,tegra186") &&
+	    !of_machine_is_compatible("nvidia,tegra194") &&
+	    !of_machine_is_compatible("nvidia,tegra234"))
+		return 0;
+
+	err = bus_register(&host1x_context_device_bus_type);
+	if (err < 0) {
+		pr_err("bus type registration failed: %d\n", err);
+		return err;
+	}
+
+	return 0;
+}
+postcore_initcall(host1x_context_device_bus_init);

diff --git a/include/linux/host1x_context_bus.h b/include/linux/host1x_context_bus.h
new file mode 100644
index 000000000000..72462737a6db
--- /dev/null
+++ b/include/linux/host1x_context_bus.h

@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (c) 2021, NVIDIA Corporation. All rights reserved.
+ */
+
+#ifndef __LINUX_HOST1X_CONTEXT_BUS_H
+#define __LINUX_HOST1X_CONTEXT_BUS_H
+
+#include <linux/device.h>
+
+#ifdef CONFIG_TEGRA_HOST1X_CONTEXT_BUS
+extern struct bus_type host1x_context_device_bus_type;
+#endif
+
+#endif

-- 
2.32.0


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[PATCH v2 4/8] iommu/arm-smmu: Attach to host1x context device bus

From: Mikko Perttunen <mperttunen@nvidia.com>
Date: 2021-09-16 14:33:43

Set itself as the IOMMU for the host1x context device bus, containing
"dummy" devices used for Host1x context isolation.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
---
 drivers/iommu/arm/arm-smmu/arm-smmu.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index 4bc75c4ce402..23082675d542 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c

@@ -39,6 +39,7 @@
 
 #include <linux/amba/bus.h>
 #include <linux/fsl/mc.h>
+#include <linux/host1x_context_bus.h>
 
 #include "arm-smmu.h"

@@ -2051,8 +2052,20 @@ static int arm_smmu_bus_init(struct iommu_ops *ops)
 			goto err_reset_pci_ops;
 	}
 #endif
+#ifdef CONFIG_TEGRA_HOST1X_CONTEXT_BUS
+	if (!iommu_present(&host1x_context_device_bus_type)) {
+		err = bus_set_iommu(&host1x_context_device_bus_type, ops);
+		if (err)
+			goto err_reset_fsl_mc_ops;
+	}
+#endif
+
 	return 0;
 
+err_reset_fsl_mc_ops: __maybe_unused;
+#ifdef CONFIG_FSL_MC_BUS
+	bus_set_iommu(&fsl_mc_bus_type, NULL);
+#endif
 err_reset_pci_ops: __maybe_unused;
 #ifdef CONFIG_PCI
 	bus_set_iommu(&pci_bus_type, NULL);

-- 
2.32.0


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[PATCH v2 7/8] drm/tegra: vic: Implement get_streamid_offset

From: Mikko Perttunen <mperttunen@nvidia.com>
Date: 2021-09-16 14:33:53

Implement the get_streamid_offset required for supporting context
isolation. Since old firmware cannot support context isolation
without hacks that we don't want to implement, check the firmware
binary to see if context isolation should be enabled.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
---
 drivers/gpu/drm/tegra/vic.c | 38 +++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/drivers/gpu/drm/tegra/vic.c b/drivers/gpu/drm/tegra/vic.c
index c02010ff2b7f..e7cc79906296 100644
--- a/drivers/gpu/drm/tegra/vic.c
+++ b/drivers/gpu/drm/tegra/vic.c

@@ -37,6 +37,8 @@ struct vic {
 	struct clk *clk;
 	struct reset_control *rst;
 
+	bool can_use_context;
+
 	/* Platform configuration */
 	const struct vic_config *config;
 };

@@ -216,6 +218,7 @@ static int vic_load_firmware(struct vic *vic)
 {
 	struct host1x_client *client = &vic->client.base;
 	struct tegra_drm *tegra = vic->client.drm;
+	u32 fce_bin_data_offset;
 	dma_addr_t iova;
 	size_t size;
 	void *virt;

@@ -264,6 +267,25 @@ static int vic_load_firmware(struct vic *vic)
 		vic->falcon.firmware.phys = phys;
 	}
 
+	/*
+	 * Check if firmware is new enough to not require mapping firmware
+	 * to data buffer domains.
+	 */
+	fce_bin_data_offset = *(u32 *)(virt + VIC_UCODE_FCE_DATA_OFFSET);
+
+	if (!vic->config->supports_sid) {
+		vic->can_use_context = false;
+	} else if (fce_bin_data_offset != 0x0 && fce_bin_data_offset != 0xa5a5a5a5) {
+		/*
+		 * Firmware will access FCE through STREAMID0, so context
+		 * isolation cannot be used.
+		 */
+		vic->can_use_context = false;
+		dev_warn_once(vic->dev, "context isolation disabled due to old firmware\n");
+	} else {
+		vic->can_use_context = true;
+	}
+
 	return 0;
 
 cleanup:

@@ -353,10 +375,26 @@ static void vic_close_channel(struct tegra_drm_context *context)
 	pm_runtime_put(vic->dev);
 }
 
+static int vic_get_streamid_offset(struct tegra_drm_client *client)
+{
+	struct vic *vic = to_vic(client);
+	int err;
+
+	err = vic_load_firmware(vic);
+	if (err < 0)
+		return err;
+
+	if (vic->can_use_context)
+		return 0x30;
+	else
+		return -ENOTSUPP;
+}
+
 static const struct tegra_drm_client_ops vic_ops = {
 	.open_channel = vic_open_channel,
 	.close_channel = vic_close_channel,
 	.submit = tegra_drm_submit,
+	.get_streamid_offset = vic_get_streamid_offset,
 };
 
 #define NVIDIA_TEGRA_124_VIC_FIRMWARE "nvidia/tegra124/vic03_ucode.bin"

-- 
2.32.0


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[PATCH v2 8/8] drm/tegra: Support context isolation

From: Mikko Perttunen <mperttunen@nvidia.com>
Date: 2021-09-16 14:34:00

For engines that support context isolation, allocate a context when
opening a channel, and set up stream ID offset and context fields
when submitting a job.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
---
 drivers/gpu/drm/tegra/drm.h    |  2 ++
 drivers/gpu/drm/tegra/submit.c | 13 +++++++++++++
 drivers/gpu/drm/tegra/uapi.c   | 34 ++++++++++++++++++++++++++++++++--
 3 files changed, 47 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/tegra/drm.h b/drivers/gpu/drm/tegra/drm.h
index fc0a19554eac..717e9f81ee1f 100644
--- a/drivers/gpu/drm/tegra/drm.h
+++ b/drivers/gpu/drm/tegra/drm.h

@@ -80,6 +80,7 @@ struct tegra_drm_context {
 
 	/* Only used by new UAPI. */
 	struct xarray mappings;
+	struct host1x_context *memory_context;
 };
 
 struct tegra_drm_client_ops {

@@ -91,6 +92,7 @@ struct tegra_drm_client_ops {
 	int (*submit)(struct tegra_drm_context *context,
 		      struct drm_tegra_submit *args, struct drm_device *drm,
 		      struct drm_file *file);
+	int (*get_streamid_offset)(struct tegra_drm_client *client);
 };
 
 int tegra_drm_submit(struct tegra_drm_context *context,

diff --git a/drivers/gpu/drm/tegra/submit.c b/drivers/gpu/drm/tegra/submit.c
index 776f825df52f..b6008246bebe 100644
--- a/drivers/gpu/drm/tegra/submit.c
+++ b/drivers/gpu/drm/tegra/submit.c

@@ -469,6 +469,9 @@ static void release_job(struct host1x_job *job)
 	struct tegra_drm_submit_data *job_data = job->user_data;
 	u32 i;
 
+	if (job->context)
+		host1x_context_put(job->context);
+
 	for (i = 0; i < job_data->num_used_mappings; i++)
 		tegra_drm_mapping_put(job_data->used_mappings[i].mapping);

@@ -572,6 +575,16 @@ int tegra_drm_ioctl_channel_submit(struct drm_device *drm, void *data,
 	job->release = release_job;
 	job->timeout = 10000;
 
+	if (context->memory_context && context->client->ops->get_streamid_offset) {
+		int offset = context->client->ops->get_streamid_offset(context->client);
+
+		if (offset >= 0) {
+			job->context = context->memory_context;
+			job->engine_streamid_offset = offset;
+			host1x_context_get(job->context);
+		}
+	}
+
 	/*
 	 * job_data is now part of job reference counting, so don't release
 	 * it from here.

diff --git a/drivers/gpu/drm/tegra/uapi.c b/drivers/gpu/drm/tegra/uapi.c
index 690a339c52ec..bfded46b974a 100644
--- a/drivers/gpu/drm/tegra/uapi.c
+++ b/drivers/gpu/drm/tegra/uapi.c

@@ -37,6 +37,9 @@ static void tegra_drm_channel_context_close(struct tegra_drm_context *context)
 	struct tegra_drm_mapping *mapping;
 	unsigned long id;
 
+	if (context->memory_context)
+		host1x_context_put(context->memory_context);
+
 	xa_for_each(&context->mappings, id, mapping)
 		tegra_drm_mapping_put(mapping);

@@ -76,6 +79,7 @@ static struct tegra_drm_client *tegra_drm_find_client(struct tegra_drm *tegra, u
 
 int tegra_drm_ioctl_channel_open(struct drm_device *drm, void *data, struct drm_file *file)
 {
+	struct host1x *host = tegra_drm_to_host1x(drm->dev_private);
 	struct tegra_drm_file *fpriv = file->driver_priv;
 	struct tegra_drm *tegra = drm->dev_private;
 	struct drm_tegra_channel_open *args = data;

@@ -106,10 +110,29 @@ int tegra_drm_ioctl_channel_open(struct drm_device *drm, void *data, struct drm_
 		}
 	}
 
+	/* Only allocate context if the engine supports context isolation. */
+	if (client->ops->get_streamid_offset &&
+	    client->ops->get_streamid_offset(client) >= 0) {
+		context->memory_context =
+			host1x_context_alloc(host, get_task_pid(current, PIDTYPE_TGID));
+		if (IS_ERR(context->memory_context)) {
+			if (PTR_ERR(context->memory_context) != -EOPNOTSUPP) {
+				err = PTR_ERR(context->memory_context);
+				goto put_channel;
+			} else {
+				/*
+				 * OK, HW does not support contexts or contexts
+				 * are disabled.
+				 */
+				context->memory_context = NULL;
+			}
+		}
+	}
+
 	err = xa_alloc(&fpriv->contexts, &args->context, context, XA_LIMIT(1, U32_MAX),
 		       GFP_KERNEL);
 	if (err < 0)
-		goto put_channel;
+		goto put_memctx;
 
 	context->client = client;
 	xa_init_flags(&context->mappings, XA_FLAGS_ALLOC1);

@@ -122,6 +145,9 @@ int tegra_drm_ioctl_channel_open(struct drm_device *drm, void *data, struct drm_
 
 	return 0;
 
+put_memctx:
+	if (context->memory_context)
+		host1x_context_put(context->memory_context);
 put_channel:
 	host1x_channel_put(context->channel);
 free:

@@ -180,7 +206,11 @@ int tegra_drm_ioctl_channel_map(struct drm_device *drm, void *data, struct drm_f
 
 	kref_init(&mapping->ref);
 
-	mapping->dev = context->client->base.dev;
+	if (context->memory_context)
+		mapping->dev = &context->memory_context->dev;
+	else
+		mapping->dev = context->client->base.dev;
+
 	mapping->bo = tegra_gem_lookup(file, args->handle);
 	if (!mapping->bo) {
 		err = -EINVAL;

-- 
2.32.0


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[PATCH v2 6/8] drm/tegra: falcon: Set DMACTX field on DMA transactions

From: Mikko Perttunen <mperttunen@nvidia.com>
Date: 2021-09-16 14:34:04

The DMACTX field determines which context, as specified in the
TRANSCFG register, is used. While during boot it doesn't matter
which is used, later on it matters and this value is reused by
the firmware.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
---
 drivers/gpu/drm/tegra/falcon.c | 8 ++++++++
 drivers/gpu/drm/tegra/falcon.h | 1 +
 2 files changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/tegra/falcon.c b/drivers/gpu/drm/tegra/falcon.c
index 223ab2ceb7e6..8bdb72f08f58 100644
--- a/drivers/gpu/drm/tegra/falcon.c
+++ b/drivers/gpu/drm/tegra/falcon.c

@@ -48,6 +48,14 @@ static int falcon_copy_chunk(struct falcon *falcon,
 	if (target == FALCON_MEMORY_IMEM)
 		cmd |= FALCON_DMATRFCMD_IMEM;
 
+	/*
+	 * Use second DMA context (i.e. the one for firmware). Strictly
+	 * speaking, at this point both DMA contexts point to the firmware
+	 * stream ID, but this register's value will be reused by the firmware
+	 * for later DMA transactions, so we need to use the correct value.
+	 */
+	cmd |= FALCON_DMATRFCMD_DMACTX(1);
+
 	falcon_writel(falcon, offset, FALCON_DMATRFMOFFS);
 	falcon_writel(falcon, base, FALCON_DMATRFFBOFFS);
 	falcon_writel(falcon, cmd, FALCON_DMATRFCMD);

diff --git a/drivers/gpu/drm/tegra/falcon.h b/drivers/gpu/drm/tegra/falcon.h
index c56ee32d92ee..1955cf11a8a6 100644
--- a/drivers/gpu/drm/tegra/falcon.h
+++ b/drivers/gpu/drm/tegra/falcon.h

@@ -50,6 +50,7 @@
 #define FALCON_DMATRFCMD_IDLE			(1 << 1)
 #define FALCON_DMATRFCMD_IMEM			(1 << 4)
 #define FALCON_DMATRFCMD_SIZE_256B		(6 << 8)
+#define FALCON_DMATRFCMD_DMACTX(v)		(((v) & 0x7) << 12)
 
 #define FALCON_DMATRFFBOFFS			0x0000111c

-- 
2.32.0


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[PATCH v2 2/8] gpu: host1x: Add context device management code

From: Mikko Perttunen <mperttunen@nvidia.com>
Date: 2021-09-16 14:34:06

Add code to register context devices from device tree, allocate them
out and manage their refcounts.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
---
v2:
* Directly set DMA mask instead of inheriting from Host1x.
* Use iommu-map instead of custom DT property.
---
 drivers/gpu/host1x/Makefile  |   1 +
 drivers/gpu/host1x/context.c | 174 +++++++++++++++++++++++++++++++++++
 drivers/gpu/host1x/context.h |  27 ++++++
 drivers/gpu/host1x/dev.c     |  12 ++-
 drivers/gpu/host1x/dev.h     |   2 +
 include/linux/host1x.h       |  17 ++++
 6 files changed, 232 insertions(+), 1 deletion(-)
 create mode 100644 drivers/gpu/host1x/context.c
 create mode 100644 drivers/gpu/host1x/context.h

diff --git a/drivers/gpu/host1x/Makefile b/drivers/gpu/host1x/Makefile
index c891a3e33844..8a65e13d113a 100644
--- a/drivers/gpu/host1x/Makefile
+++ b/drivers/gpu/host1x/Makefile

@@ -10,6 +10,7 @@ host1x-y = \
 	debug.o \
 	mipi.o \
 	fence.o \
+	context.o \
 	hw/host1x01.o \
 	hw/host1x02.o \
 	hw/host1x04.o \

diff --git a/drivers/gpu/host1x/context.c b/drivers/gpu/host1x/context.c
new file mode 100644
index 000000000000..987c08a1e2f2
--- /dev/null
+++ b/drivers/gpu/host1x/context.c

@@ -0,0 +1,174 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021, NVIDIA Corporation.
+ */
+
+#include <linux/device.h>
+#include <linux/kref.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/pid.h>
+#include <linux/slab.h>
+
+#include "context.h"
+#include "dev.h"
+
+/*
+ * Due to an issue with T194 NVENC, only 38 bits can be used.
+ * Anyway, 256GiB of IOVA ought to be enough for anyone.
+ */
+static dma_addr_t context_device_dma_mask = DMA_BIT_MASK(38);
+
+int host1x_context_list_init(struct host1x *host1x)
+{
+	struct host1x_context_list *cdl = &host1x->context_list;
+	struct host1x_context *ctx;
+	struct device_node *node;
+	int index;
+	int err;
+
+	node = of_get_child_by_name(host1x->dev->of_node, "memory-contexts");
+	if (!node)
+		return 0;
+
+	cdl->devs = NULL;
+	cdl->len = 0;
+	mutex_init(&cdl->lock);
+
+	err = of_property_count_u32_elems(node, "iommu-map");
+	if (err < 0) {
+		err = 0;
+		goto put_node;
+	}
+
+	cdl->devs = kcalloc(err, sizeof(*cdl->devs), GFP_KERNEL);
+	if (!cdl->devs) {
+		err = -ENOMEM;
+		goto put_node;
+	}
+	cdl->len = err / 4;
+
+	for (index = 0; index < cdl->len; index++) {
+		struct iommu_fwspec *fwspec;
+
+		ctx = &cdl->devs[index];
+
+		ctx->host = host1x;
+
+		device_initialize(&ctx->dev);
+
+		ctx->dev.dma_mask = &context_device_dma_mask;
+		ctx->dev.coherent_dma_mask = context_device_dma_mask;
+		dev_set_name(&ctx->dev, "host1x-ctx.%d", index);
+		ctx->dev.bus = &host1x_context_device_bus_type;
+		ctx->dev.parent = host1x->dev;
+
+		dma_set_max_seg_size(&ctx->dev, UINT_MAX);
+
+		err = device_add(&ctx->dev);
+		if (err) {
+			dev_err(host1x->dev, "could not add context device %d: %d\n", index, err);
+			goto del_devices;
+		}
+
+		err = of_dma_configure_id(&ctx->dev, node, true, &index);
+		if (err) {
+			dev_err(host1x->dev, "IOMMU configuration failed for context device %d: %d\n",
+				index, err);
+			device_del(&ctx->dev);
+			goto del_devices;
+		}
+
+		fwspec = dev_iommu_fwspec_get(&ctx->dev);
+		if (!fwspec) {
+			dev_err(host1x->dev, "Context device %d has no IOMMU!\n", index);
+			device_del(&ctx->dev);
+			goto del_devices;
+		}
+
+		ctx->stream_id = fwspec->ids[0] & 0xffff;
+	}
+
+	of_node_put(node);
+
+	return 0;
+
+del_devices:
+	while (--index >= 0)
+		device_del(&cdl->devs[index].dev);
+
+	kfree(cdl->devs);
+	cdl->len = 0;
+
+put_node:
+	of_node_put(node);
+
+	return err;
+}
+
+void host1x_context_list_free(struct host1x_context_list *cdl)
+{
+	int i;
+
+	for (i = 0; i < cdl->len; i++)
+		device_del(&cdl->devs[i].dev);
+
+	kfree(cdl->devs);
+	cdl->len = 0;
+}
+
+struct host1x_context *host1x_context_alloc(struct host1x *host1x,
+					    struct pid *pid)
+{
+	struct host1x_context_list *cdl = &host1x->context_list;
+	struct host1x_context *free = NULL;
+	int i;
+
+	if (!cdl->len)
+		return ERR_PTR(-EOPNOTSUPP);
+
+	mutex_lock(&cdl->lock);
+
+	for (i = 0; i < cdl->len; i++) {
+		struct host1x_context *cd = &cdl->devs[i];
+
+		if (cd->owner == pid) {
+			refcount_inc(&cd->ref);
+			mutex_unlock(&cdl->lock);
+			return cd;
+		} else if (!cd->owner && !free) {
+			free = cd;
+		}
+	}
+
+	if (!free) {
+		mutex_unlock(&cdl->lock);
+		return ERR_PTR(-EBUSY);
+	}
+
+	refcount_set(&free->ref, 1);
+	free->owner = get_pid(pid);
+
+	mutex_unlock(&cdl->lock);
+
+	return free;
+}
+EXPORT_SYMBOL(host1x_context_alloc);
+
+void host1x_context_get(struct host1x_context *cd)
+{
+	refcount_inc(&cd->ref);
+}
+EXPORT_SYMBOL(host1x_context_get);
+
+void host1x_context_put(struct host1x_context *cd)
+{
+	struct host1x_context_list *cdl = &cd->host->context_list;
+
+	if (refcount_dec_and_mutex_lock(&cd->ref, &cdl->lock)) {
+		put_pid(cd->owner);
+		cd->owner = NULL;
+		mutex_unlock(&cdl->lock);
+	}
+}
+EXPORT_SYMBOL(host1x_context_put);

diff --git a/drivers/gpu/host1x/context.h b/drivers/gpu/host1x/context.h
new file mode 100644
index 000000000000..268ecdf6b1bb
--- /dev/null
+++ b/drivers/gpu/host1x/context.h

@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Host1x context devices
+ *
+ * Copyright (c) 2020, NVIDIA Corporation.
+ */
+
+#ifndef __HOST1X_CONTEXT_H
+#define __HOST1X_CONTEXT_H
+
+#include <linux/mutex.h>
+#include <linux/refcount.h>
+
+struct host1x;
+
+extern struct bus_type host1x_context_device_bus_type;
+
+struct host1x_context_list {
+	struct mutex lock;
+	struct host1x_context *devs;
+	unsigned int len;
+};
+
+int host1x_context_list_init(struct host1x *host1x);
+void host1x_context_list_free(struct host1x_context_list *cdl);
+
+#endif

diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c
index e2ddf3fcaa9a..736cd2b4a149 100644
--- a/drivers/gpu/host1x/dev.c
+++ b/drivers/gpu/host1x/dev.c

@@ -20,6 +20,7 @@
 
 #include "bus.h"
 #include "channel.h"
+#include "context.h"
 #include "debug.h"
 #include "dev.h"
 #include "intr.h"

@@ -461,10 +462,16 @@ static int host1x_probe(struct platform_device *pdev)
 		goto iommu_exit;
 	}
 
+	err = host1x_context_list_init(host);
+	if (err) {
+		dev_err(&pdev->dev, "failed to initialize context list\n");
+		goto free_channels;
+	}
+
 	err = clk_prepare_enable(host->clk);
 	if (err < 0) {
 		dev_err(&pdev->dev, "failed to enable clock\n");
-		goto free_channels;
+		goto free_contexts;
 	}
 
 	err = reset_control_deassert(host->rst);

@@ -511,6 +518,8 @@ static int host1x_probe(struct platform_device *pdev)
 	reset_control_assert(host->rst);
 unprepare_disable:
 	clk_disable_unprepare(host->clk);
+free_contexts:
+	host1x_context_list_free(&host->context_list);
 free_channels:
 	host1x_channel_list_free(&host->channel_list);
 iommu_exit:

@@ -529,6 +538,7 @@ static int host1x_remove(struct platform_device *pdev)
 	host1x_syncpt_deinit(host);
 	reset_control_assert(host->rst);
 	clk_disable_unprepare(host->clk);
+	host1x_context_list_free(&host->context_list);
 	host1x_iommu_exit(host);
 
 	return 0;

diff --git a/drivers/gpu/host1x/dev.h b/drivers/gpu/host1x/dev.h
index fa6d4bc46e98..cfc42de78fa9 100644
--- a/drivers/gpu/host1x/dev.h
+++ b/drivers/gpu/host1x/dev.h

@@ -14,6 +14,7 @@
 
 #include "cdma.h"
 #include "channel.h"
+#include "context.h"
 #include "intr.h"
 #include "job.h"
 #include "syncpt.h"

@@ -140,6 +141,7 @@ struct host1x {
 	struct mutex syncpt_mutex;
 
 	struct host1x_channel_list channel_list;
+	struct host1x_context_list context_list;
 
 	struct dentry *debugfs;

diff --git a/include/linux/host1x.h b/include/linux/host1x.h
index 2a1b53ebee77..f3073738564a 100644
--- a/include/linux/host1x.h
+++ b/include/linux/host1x.h

@@ -396,4 +396,21 @@ int tegra_mipi_disable(struct tegra_mipi_device *device);
 int tegra_mipi_start_calibration(struct tegra_mipi_device *device);
 int tegra_mipi_finish_calibration(struct tegra_mipi_device *device);
 
+/* host1x context devices */
+
+struct host1x_context {
+	struct host1x *host;
+
+	refcount_t ref;
+	struct pid *owner;
+
+	struct device dev;
+	u32 stream_id;
+};
+
+struct host1x_context *host1x_context_alloc(struct host1x *host1x,
+					    struct pid *pid);
+void host1x_context_get(struct host1x_context *cd);
+void host1x_context_put(struct host1x_context *cd);
+
 #endif

-- 
2.32.0


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[PATCH v2 5/8] arm64: tegra: Add Host1x context stream IDs on Tegra186+

From: Mikko Perttunen <mperttunen@nvidia.com>
Date: 2021-09-16 14:34:14

Add Host1x context stream IDs on systems that support Host1x context
isolation. Host1x and attached engines can use these stream IDs to
allow isolation between memory used by different processes.

The specified stream IDs must match those configured by the hypervisor,
if one is present.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
---
v2:
* Added context devices on T194.
* Use iommu-map instead of custom property.
---
 arch/arm64/boot/dts/nvidia/tegra186.dtsi | 12 ++++++++++++
 arch/arm64/boot/dts/nvidia/tegra194.dtsi | 12 ++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/arch/arm64/boot/dts/nvidia/tegra186.dtsi b/arch/arm64/boot/dts/nvidia/tegra186.dtsi
index 065185bd65ed..71571c29c7ae 100644
--- a/arch/arm64/boot/dts/nvidia/tegra186.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra186.dtsi

@@ -1270,6 +1270,18 @@ host1x@13e00000 {
 
 		iommus = <&smmu TEGRA186_SID_HOST1X>;
 
+		memory-contexts {
+			iommu-map = <
+				0 &smmu TEGRA186_SID_HOST1X_CTX0 1
+				1 &smmu TEGRA186_SID_HOST1X_CTX1 1
+				2 &smmu TEGRA186_SID_HOST1X_CTX2 1
+				3 &smmu TEGRA186_SID_HOST1X_CTX3 1
+				4 &smmu TEGRA186_SID_HOST1X_CTX4 1
+				5 &smmu TEGRA186_SID_HOST1X_CTX5 1
+				6 &smmu TEGRA186_SID_HOST1X_CTX6 1
+				7 &smmu TEGRA186_SID_HOST1X_CTX7 1>;
+		};
+
 		dpaux1: dpaux@15040000 {
 			compatible = "nvidia,tegra186-dpaux";
 			reg = <0x15040000 0x10000>;

diff --git a/arch/arm64/boot/dts/nvidia/tegra194.dtsi b/arch/arm64/boot/dts/nvidia/tegra194.dtsi
index 5788735ef968..abcdc42614a6 100644
--- a/arch/arm64/boot/dts/nvidia/tegra194.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra194.dtsi

@@ -1412,6 +1412,18 @@ host1x@13e00000 {
 			interconnect-names = "dma-mem";
 			iommus = <&smmu TEGRA194_SID_HOST1X>;
 
+			memory-contexts {
+				iommu-map = <
+					0 &smmu TEGRA194_SID_HOST1X_CTX0 1
+					1 &smmu TEGRA194_SID_HOST1X_CTX1 1
+					2 &smmu TEGRA194_SID_HOST1X_CTX2 1
+					3 &smmu TEGRA194_SID_HOST1X_CTX3 1
+					4 &smmu TEGRA194_SID_HOST1X_CTX4 1
+					5 &smmu TEGRA194_SID_HOST1X_CTX5 1
+					6 &smmu TEGRA194_SID_HOST1X_CTX6 1
+					7 &smmu TEGRA194_SID_HOST1X_CTX7 1>;
+			};
+
 			nvdec@15140000 {
 				compatible = "nvidia,tegra194-nvdec";
 				reg = <0x15140000 0x00040000>;

-- 
2.32.0


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Re: [PATCH v2 0/8] Host1x context isolation support

From: Mikko Perttunen <hidden>
Date: 2021-11-08 10:37:04

On 9/16/21 5:32 PM, Mikko Perttunen wrote:

Hi all,

***
New in v2:

Added support for Tegra194
Use standard iommu-map property instead of custom mechanism
***

this series adds support for Host1x 'context isolation'. Since
when programming engines through Host1x, userspace can program in
any addresses it wants, we need some way to isolate the engines'
memory spaces. Traditionally this has either been done imperfectly
with a single shared IOMMU domain, or by copying and verifying the
programming command stream at submit time (Host1x firewall).

Since Tegra186 there is a privileged (only usable by kernel)
Host1x opcode that allows setting the stream ID sent by the engine
to the SMMU. So, by allocating a number of context banks and stream
IDs for this purpose, and using this opcode at the beginning of
each job, we can implement isolation. Due to the limited number of
context banks only each process gets its own context, and not
each channel.

This feature also allows sharing engines among multiple VMs when
used with Host1x's hardware virtualization support - up to 8 VMs
can be configured with a subset of allowed stream IDs, enforced
at hardware level.

To implement this, this series adds a new host1x context bus, which
will contain the 'struct device's corresponding to each context
bank / stream ID, changes to device tree and SMMU code to allow
registering the devices and using the bus, as well as the Host1x
stream ID programming code and support in TegraDRM.

Device tree bindings are not updated yet pending consensus that the
proposed changes make sense.

Thanks,
Mikko

Mikko Perttunen (8):
   gpu: host1x: Add context bus
   gpu: host1x: Add context device management code
   gpu: host1x: Program context stream ID on submission
   iommu/arm-smmu: Attach to host1x context device bus
   arm64: tegra: Add Host1x context stream IDs on Tegra186+
   drm/tegra: falcon: Set DMACTX field on DMA transactions
   drm/tegra: vic: Implement get_streamid_offset
   drm/tegra: Support context isolation

  arch/arm64/boot/dts/nvidia/tegra186.dtsi  |  12 ++
  arch/arm64/boot/dts/nvidia/tegra194.dtsi  |  12 ++
  drivers/gpu/Makefile                      |   3 +-
  drivers/gpu/drm/tegra/drm.h               |   2 +
  drivers/gpu/drm/tegra/falcon.c            |   8 +
  drivers/gpu/drm/tegra/falcon.h            |   1 +
  drivers/gpu/drm/tegra/submit.c            |  13 ++
  drivers/gpu/drm/tegra/uapi.c              |  34 ++++-
  drivers/gpu/drm/tegra/vic.c               |  38 +++++
  drivers/gpu/host1x/Kconfig                |   5 +
  drivers/gpu/host1x/Makefile               |   2 +
  drivers/gpu/host1x/context.c              | 174 ++++++++++++++++++++++
  drivers/gpu/host1x/context.h              |  27 ++++
  drivers/gpu/host1x/context_bus.c          |  31 ++++
  drivers/gpu/host1x/dev.c                  |  12 +-
  drivers/gpu/host1x/dev.h                  |   2 +
  drivers/gpu/host1x/hw/channel_hw.c        |  52 ++++++-
  drivers/gpu/host1x/hw/host1x06_hardware.h |  10 ++
  drivers/gpu/host1x/hw/host1x07_hardware.h |  10 ++
  drivers/iommu/arm/arm-smmu/arm-smmu.c     |  13 ++
  include/linux/host1x.h                    |  21 +++
  include/linux/host1x_context_bus.h        |  15 ++
  22 files changed, 488 insertions(+), 9 deletions(-)
  create mode 100644 drivers/gpu/host1x/context.c
  create mode 100644 drivers/gpu/host1x/context.h
  create mode 100644 drivers/gpu/host1x/context_bus.c
  create mode 100644 include/linux/host1x_context_bus.h

IOMMU/DT folks, any thoughts about this approach? The patches that are of interest outside of Host1x/TegraDRM specifics are patches 1, 2, 4, and 5.

Thanks,
Mikko

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Re: [PATCH v2 0/8] Host1x context isolation support

From: Jon Hunter <jonathanh@nvidia.com>
Date: 2021-12-06 09:55:27

Will, Joerg, Rob,

On 08/11/2021 10:36, Mikko Perttunen wrote:

On 9/16/21 5:32 PM, Mikko Perttunen wrote:

quoted

Hi all,

***
New in v2:

Added support for Tegra194
Use standard iommu-map property instead of custom mechanism
***

this series adds support for Host1x 'context isolation'. Since
when programming engines through Host1x, userspace can program in
any addresses it wants, we need some way to isolate the engines'
memory spaces. Traditionally this has either been done imperfectly
with a single shared IOMMU domain, or by copying and verifying the
programming command stream at submit time (Host1x firewall).

Since Tegra186 there is a privileged (only usable by kernel)
Host1x opcode that allows setting the stream ID sent by the engine
to the SMMU. So, by allocating a number of context banks and stream
IDs for this purpose, and using this opcode at the beginning of
each job, we can implement isolation. Due to the limited number of
context banks only each process gets its own context, and not
each channel.

This feature also allows sharing engines among multiple VMs when
used with Host1x's hardware virtualization support - up to 8 VMs
can be configured with a subset of allowed stream IDs, enforced
at hardware level.

To implement this, this series adds a new host1x context bus, which
will contain the 'struct device's corresponding to each context
bank / stream ID, changes to device tree and SMMU code to allow
registering the devices and using the bus, as well as the Host1x
stream ID programming code and support in TegraDRM.

Device tree bindings are not updated yet pending consensus that the
proposed changes make sense.

Thanks,
Mikko

Mikko Perttunen (8):
   gpu: host1x: Add context bus
   gpu: host1x: Add context device management code
   gpu: host1x: Program context stream ID on submission
   iommu/arm-smmu: Attach to host1x context device bus
   arm64: tegra: Add Host1x context stream IDs on Tegra186+
   drm/tegra: falcon: Set DMACTX field on DMA transactions
   drm/tegra: vic: Implement get_streamid_offset
   drm/tegra: Support context isolation

  arch/arm64/boot/dts/nvidia/tegra186.dtsi  |  12 ++
  arch/arm64/boot/dts/nvidia/tegra194.dtsi  |  12 ++
  drivers/gpu/Makefile                      |   3 +-
  drivers/gpu/drm/tegra/drm.h               |   2 +
  drivers/gpu/drm/tegra/falcon.c            |   8 +
  drivers/gpu/drm/tegra/falcon.h            |   1 +
  drivers/gpu/drm/tegra/submit.c            |  13 ++
  drivers/gpu/drm/tegra/uapi.c              |  34 ++++-
  drivers/gpu/drm/tegra/vic.c               |  38 +++++
  drivers/gpu/host1x/Kconfig                |   5 +
  drivers/gpu/host1x/Makefile               |   2 +
  drivers/gpu/host1x/context.c              | 174 ++++++++++++++++++++++
  drivers/gpu/host1x/context.h              |  27 ++++
  drivers/gpu/host1x/context_bus.c          |  31 ++++
  drivers/gpu/host1x/dev.c                  |  12 +-
  drivers/gpu/host1x/dev.h                  |   2 +
  drivers/gpu/host1x/hw/channel_hw.c        |  52 ++++++-
  drivers/gpu/host1x/hw/host1x06_hardware.h |  10 ++
  drivers/gpu/host1x/hw/host1x07_hardware.h |  10 ++
  drivers/iommu/arm/arm-smmu/arm-smmu.c     |  13 ++
  include/linux/host1x.h                    |  21 +++
  include/linux/host1x_context_bus.h        |  15 ++
  22 files changed, 488 insertions(+), 9 deletions(-)
  create mode 100644 drivers/gpu/host1x/context.c
  create mode 100644 drivers/gpu/host1x/context.h
  create mode 100644 drivers/gpu/host1x/context_bus.c
  create mode 100644 include/linux/host1x_context_bus.h

IOMMU/DT folks, any thoughts about this approach? The patches that are of interest outside of Host1x/TegraDRM specifics are patches 1, 2, 4, and 5.


Any feedback on this?

Jon

-- 
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Re: [PATCH v2 0/8] Host1x context isolation support

From: Jon Hunter <jonathanh@nvidia.com>
Date: 2021-12-14 08:06:03

Hi all,

Still no response on this :-(

On 06/12/2021 09:55, Jon Hunter wrote:

Will, Joerg, Rob,

On 08/11/2021 10:36, Mikko Perttunen wrote:

quoted

On 9/16/21 5:32 PM, Mikko Perttunen wrote:

quoted

Hi all,

***
New in v2:

Added support for Tegra194
Use standard iommu-map property instead of custom mechanism
***

this series adds support for Host1x 'context isolation'. Since
when programming engines through Host1x, userspace can program in
any addresses it wants, we need some way to isolate the engines'
memory spaces. Traditionally this has either been done imperfectly
with a single shared IOMMU domain, or by copying and verifying the
programming command stream at submit time (Host1x firewall).

Since Tegra186 there is a privileged (only usable by kernel)
Host1x opcode that allows setting the stream ID sent by the engine
to the SMMU. So, by allocating a number of context banks and stream
IDs for this purpose, and using this opcode at the beginning of
each job, we can implement isolation. Due to the limited number of
context banks only each process gets its own context, and not
each channel.

This feature also allows sharing engines among multiple VMs when
used with Host1x's hardware virtualization support - up to 8 VMs
can be configured with a subset of allowed stream IDs, enforced
at hardware level.

To implement this, this series adds a new host1x context bus, which
will contain the 'struct device's corresponding to each context
bank / stream ID, changes to device tree and SMMU code to allow
registering the devices and using the bus, as well as the Host1x
stream ID programming code and support in TegraDRM.

Device tree bindings are not updated yet pending consensus that the
proposed changes make sense.

Thanks,
Mikko

Mikko Perttunen (8):
   gpu: host1x: Add context bus
   gpu: host1x: Add context device management code
   gpu: host1x: Program context stream ID on submission
   iommu/arm-smmu: Attach to host1x context device bus
   arm64: tegra: Add Host1x context stream IDs on Tegra186+
   drm/tegra: falcon: Set DMACTX field on DMA transactions
   drm/tegra: vic: Implement get_streamid_offset
   drm/tegra: Support context isolation

  arch/arm64/boot/dts/nvidia/tegra186.dtsi  |  12 ++
  arch/arm64/boot/dts/nvidia/tegra194.dtsi  |  12 ++
  drivers/gpu/Makefile                      |   3 +-
  drivers/gpu/drm/tegra/drm.h               |   2 +
  drivers/gpu/drm/tegra/falcon.c            |   8 +
  drivers/gpu/drm/tegra/falcon.h            |   1 +
  drivers/gpu/drm/tegra/submit.c            |  13 ++
  drivers/gpu/drm/tegra/uapi.c              |  34 ++++-
  drivers/gpu/drm/tegra/vic.c               |  38 +++++
  drivers/gpu/host1x/Kconfig                |   5 +
  drivers/gpu/host1x/Makefile               |   2 +
  drivers/gpu/host1x/context.c              | 174 ++++++++++++++++++++++
  drivers/gpu/host1x/context.h              |  27 ++++
  drivers/gpu/host1x/context_bus.c          |  31 ++++
  drivers/gpu/host1x/dev.c                  |  12 +-
  drivers/gpu/host1x/dev.h                  |   2 +
  drivers/gpu/host1x/hw/channel_hw.c        |  52 ++++++-
  drivers/gpu/host1x/hw/host1x06_hardware.h |  10 ++
  drivers/gpu/host1x/hw/host1x07_hardware.h |  10 ++
  drivers/iommu/arm/arm-smmu/arm-smmu.c     |  13 ++
  include/linux/host1x.h                    |  21 +++
  include/linux/host1x_context_bus.h        |  15 ++
  22 files changed, 488 insertions(+), 9 deletions(-)
  create mode 100644 drivers/gpu/host1x/context.c
  create mode 100644 drivers/gpu/host1x/context.h
  create mode 100644 drivers/gpu/host1x/context_bus.c
  create mode 100644 include/linux/host1x_context_bus.h

IOMMU/DT folks, any thoughts about this approach? The patches that are of interest outside of Host1x/TegraDRM specifics are patches 1, 2, 4, and 5.


Any feedback on this?

Jon

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Re: [PATCH v2 0/8] Host1x context isolation support

From: Dmitry Osipenko <digetx@gmail.com>
Date: 2021-12-14 14:35:44

14.12.2021 11:05, Jon Hunter пишет:

Hi all,

Still no response on this :-(

I see only two patches on Tegra ML and others on DRI ML. Might be good
to start with re-sending this whole series and CCing MLs properly.


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Re: [PATCH v2 0/8] Host1x context isolation support

From: Mikko Perttunen <hidden>
Date: 2021-12-14 14:53:31

On 12/14/21 16:35, Dmitry Osipenko wrote:

14.12.2021 11:05, Jon Hunter пишет:

quoted

Hi all,

Still no response on this :-(

I see only two patches on Tegra ML and others on DRI ML. Might be good
to start with re-sending this whole series and CCing MLs properly.

All patches should have been sent to the same set of addresses. At least LWN's archive seems to agree..

Mikko

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Re: [PATCH v2 0/8] Host1x context isolation support

From: Dmitry Osipenko <digetx@gmail.com>
Date: 2021-12-14 15:31:22

14.12.2021 17:53, Mikko Perttunen пишет:

On 12/14/21 16:35, Dmitry Osipenko wrote:

quoted

14.12.2021 11:05, Jon Hunter пишет:

quoted

Hi all,

Still no response on this :-(

I see only two patches on Tegra ML and others on DRI ML. Might be good
to start with re-sending this whole series and CCing MLs properly.

All patches should have been sent to the same set of addresses. At least
LWN's archive seems to agree..

Indeed, I see that Tegra ML was CCed and I see all patches on Tegra
patchwork, but I don't see them all on lore and gmane.

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Re: [PATCH v2 0/8] Host1x context isolation support

From: Robin Murphy <robin.murphy@arm.com>
Date: 2021-12-14 15:39:03

On 2021-11-08 10:36, Mikko Perttunen wrote:

On 9/16/21 5:32 PM, Mikko Perttunen wrote:

quoted

Hi all,

***
New in v2:

Added support for Tegra194
Use standard iommu-map property instead of custom mechanism
***

this series adds support for Host1x 'context isolation'. Since
when programming engines through Host1x, userspace can program in
any addresses it wants, we need some way to isolate the engines'
memory spaces. Traditionally this has either been done imperfectly
with a single shared IOMMU domain, or by copying and verifying the
programming command stream at submit time (Host1x firewall).

Since Tegra186 there is a privileged (only usable by kernel)
Host1x opcode that allows setting the stream ID sent by the engine
to the SMMU. So, by allocating a number of context banks and stream
IDs for this purpose, and using this opcode at the beginning of
each job, we can implement isolation. Due to the limited number of
context banks only each process gets its own context, and not
each channel.

This feature also allows sharing engines among multiple VMs when
used with Host1x's hardware virtualization support - up to 8 VMs
can be configured with a subset of allowed stream IDs, enforced
at hardware level.

To implement this, this series adds a new host1x context bus, which
will contain the 'struct device's corresponding to each context
bank / stream ID, changes to device tree and SMMU code to allow
registering the devices and using the bus, as well as the Host1x
stream ID programming code and support in TegraDRM.

Device tree bindings are not updated yet pending consensus that the
proposed changes make sense.

Thanks,
Mikko

Mikko Perttunen (8):
   gpu: host1x: Add context bus
   gpu: host1x: Add context device management code
   gpu: host1x: Program context stream ID on submission
   iommu/arm-smmu: Attach to host1x context device bus
   arm64: tegra: Add Host1x context stream IDs on Tegra186+
   drm/tegra: falcon: Set DMACTX field on DMA transactions
   drm/tegra: vic: Implement get_streamid_offset
   drm/tegra: Support context isolation

  arch/arm64/boot/dts/nvidia/tegra186.dtsi  |  12 ++
  arch/arm64/boot/dts/nvidia/tegra194.dtsi  |  12 ++
  drivers/gpu/Makefile                      |   3 +-
  drivers/gpu/drm/tegra/drm.h               |   2 +
  drivers/gpu/drm/tegra/falcon.c            |   8 +
  drivers/gpu/drm/tegra/falcon.h            |   1 +
  drivers/gpu/drm/tegra/submit.c            |  13 ++
  drivers/gpu/drm/tegra/uapi.c              |  34 ++++-
  drivers/gpu/drm/tegra/vic.c               |  38 +++++
  drivers/gpu/host1x/Kconfig                |   5 +
  drivers/gpu/host1x/Makefile               |   2 +
  drivers/gpu/host1x/context.c              | 174 ++++++++++++++++++++++
  drivers/gpu/host1x/context.h              |  27 ++++
  drivers/gpu/host1x/context_bus.c          |  31 ++++
  drivers/gpu/host1x/dev.c                  |  12 +-
  drivers/gpu/host1x/dev.h                  |   2 +
  drivers/gpu/host1x/hw/channel_hw.c        |  52 ++++++-
  drivers/gpu/host1x/hw/host1x06_hardware.h |  10 ++
  drivers/gpu/host1x/hw/host1x07_hardware.h |  10 ++
  drivers/iommu/arm/arm-smmu/arm-smmu.c     |  13 ++
  include/linux/host1x.h                    |  21 +++
  include/linux/host1x_context_bus.h        |  15 ++
  22 files changed, 488 insertions(+), 9 deletions(-)
  create mode 100644 drivers/gpu/host1x/context.c
  create mode 100644 drivers/gpu/host1x/context.h
  create mode 100644 drivers/gpu/host1x/context_bus.c
  create mode 100644 include/linux/host1x_context_bus.h

IOMMU/DT folks, any thoughts about this approach? The patches that are of interest outside of Host1x/TegraDRM specifics are patches 1, 2, 4, and 5.

FWIW it looks fairly innocuous to me. I don't understand host1x - neither hardware nor driver abstractions - well enough to meaningfully review it all (e.g. maybe it's deliberate that the bus .dma_configure method isn't used?), but the SMMU patch seems fine given the Kconfig solution to avoid module linkage problems.

Cheers,
Robin.

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Re: [PATCH v2 0/8] Host1x context isolation support

From: Jon Hunter <jonathanh@nvidia.com>
Date: 2021-12-17 11:16:22

On 14/12/2021 15:38, Robin Murphy wrote:

...

quoted

IOMMU/DT folks, any thoughts about this approach? The patches that are of interest outside of Host1x/TegraDRM specifics are patches 1, 2, 4, and 5.

FWIW it looks fairly innocuous to me. I don't understand host1x - neither hardware nor driver abstractions - well enough to meaningfully review it all (e.g. maybe it's deliberate that the bus .dma_configure method isn't used?), but the SMMU patch seems fine given the Kconfig solution to avoid module linkage problems.


Thanks Robin! Will, Joerg, is OK with you?

Mikko, I believe we are missing a dt-binding change to document the 'memory-contexts' node which I assume you will add if everyone is OK with this?

Cheers
Jon

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