diff mbox series

[v6,04/10] gpu: host1x: Add context device management code

Message ID 20220621151022.1416300-5-cyndis@kapsi.fi (mailing list archive)
State New, archived
Headers show
Series Host1x context isolation support | expand

Commit Message

Mikko Perttunen June 21, 2022, 3:10 p.m. UTC 
From: Mikko Perttunen <mperttunen@nvidia.com>

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.
v4:
* Use u64 instead of dma_addr_t for DMA mask
* Use unsigned ints for indexes and adjust error handling flow
* Parse iommu-map property at top level host1x DT node
* Use separate DMA mask per device
* Export symbols as GPL
v5:
* Rename host1x_context to host1x_memory_context
---
 drivers/gpu/host1x/Makefile  |   1 +
 drivers/gpu/host1x/context.c | 160 +++++++++++++++++++++++++++++++++++
 drivers/gpu/host1x/context.h |  27 ++++++
 drivers/gpu/host1x/dev.c     |  12 ++-
 drivers/gpu/host1x/dev.h     |   2 +
 include/linux/host1x.h       |  18 ++++
 6 files changed, 219 insertions(+), 1 deletion(-)
 create mode 100644 drivers/gpu/host1x/context.c
 create mode 100644 drivers/gpu/host1x/context.h

Comments

kernel test robot June 22, 2022, 7:24 a.m. UTC | #1 
Hi Mikko,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on drm/drm-next]
[also build test ERROR on tegra/for-next linus/master v5.19-rc3]
[cannot apply to tegra-drm/drm/tegra/for-next next-20220621]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/intel-lab-lkp/linux/commits/Mikko-Perttunen/Host1x-context-isolation-support/20220621-231339
base:   git://anongit.freedesktop.org/drm/drm drm-next
config: arm64-randconfig-r021-20220622 (https://download.01.org/0day-ci/archive/20220622/202206221557.laES8yNQ-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 8b8d126598ce7bd5243da7f94f69fa1104288bee)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/2501beeae7469b805f9f624049fd56643cf6e18e
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Mikko-Perttunen/Host1x-context-isolation-support/20220621-231339
        git checkout 2501beeae7469b805f9f624049fd56643cf6e18e
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/gpu/host1x/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> drivers/gpu/host1x/context.c:80:28: error: no member named 'ids' in 'struct iommu_fwspec'
                   ctx->stream_id = fwspec->ids[0] & 0xffff;
                                    ~~~~~~  ^
   1 error generated.


vim +80 drivers/gpu/host1x/context.c

    15	
    16	int host1x_memory_context_list_init(struct host1x *host1x)
    17	{
    18		struct host1x_memory_context_list *cdl = &host1x->context_list;
    19		struct device_node *node = host1x->dev->of_node;
    20		struct host1x_memory_context *ctx;
    21		unsigned int i;
    22		int err;
    23	
    24		cdl->devs = NULL;
    25		cdl->len = 0;
    26		mutex_init(&cdl->lock);
    27	
    28		err = of_property_count_u32_elems(node, "iommu-map");
    29		if (err < 0)
    30			return 0;
    31	
    32		cdl->devs = kcalloc(err, sizeof(*cdl->devs), GFP_KERNEL);
    33		if (!cdl->devs)
    34			return -ENOMEM;
    35		cdl->len = err / 4;
    36	
    37		for (i = 0; i < cdl->len; i++) {
    38			struct iommu_fwspec *fwspec;
    39	
    40			ctx = &cdl->devs[i];
    41	
    42			ctx->host = host1x;
    43	
    44			device_initialize(&ctx->dev);
    45	
    46			/*
    47			 * Due to an issue with T194 NVENC, only 38 bits can be used.
    48			 * Anyway, 256GiB of IOVA ought to be enough for anyone.
    49			 */
    50			ctx->dma_mask = DMA_BIT_MASK(38);
    51			ctx->dev.dma_mask = &ctx->dma_mask;
    52			ctx->dev.coherent_dma_mask = ctx->dma_mask;
    53			dev_set_name(&ctx->dev, "host1x-ctx.%d", i);
    54			ctx->dev.bus = &host1x_context_device_bus_type;
    55			ctx->dev.parent = host1x->dev;
    56	
    57			dma_set_max_seg_size(&ctx->dev, UINT_MAX);
    58	
    59			err = device_add(&ctx->dev);
    60			if (err) {
    61				dev_err(host1x->dev, "could not add context device %d: %d\n", i, err);
    62				goto del_devices;
    63			}
    64	
    65			err = of_dma_configure_id(&ctx->dev, node, true, &i);
    66			if (err) {
    67				dev_err(host1x->dev, "IOMMU configuration failed for context device %d: %d\n",
    68					i, err);
    69				device_del(&ctx->dev);
    70				goto del_devices;
    71			}
    72	
    73			fwspec = dev_iommu_fwspec_get(&ctx->dev);
    74			if (!fwspec) {
    75				dev_err(host1x->dev, "Context device %d has no IOMMU!\n", i);
    76				device_del(&ctx->dev);
    77				goto del_devices;
    78			}
    79	
  > 80			ctx->stream_id = fwspec->ids[0] & 0xffff;
    81		}
    82	
    83		return 0;
    84	
    85	del_devices:
    86		while (i--)
    87			device_del(&cdl->devs[i].dev);
    88	
    89		kfree(cdl->devs);
    90		cdl->len = 0;
    91	
    92		return err;
    93	}
    94
kernel test robot July 5, 2022, 2:57 a.m. UTC | #2 
Hi Mikko,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on drm/drm-next]
[also build test ERROR on tegra/for-next linus/master v5.19-rc5]
[cannot apply to tegra-drm/drm/tegra/for-next next-20220704]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/intel-lab-lkp/linux/commits/Mikko-Perttunen/Host1x-context-isolation-support/20220621-231339
base:   git://anongit.freedesktop.org/drm/drm drm-next
config: arm-randconfig-r005-20220703 (https://download.01.org/0day-ci/archive/20220705/202207051045.JWeVR4tW-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 11.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/2501beeae7469b805f9f624049fd56643cf6e18e
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Mikko-Perttunen/Host1x-context-isolation-support/20220621-231339
        git checkout 2501beeae7469b805f9f624049fd56643cf6e18e
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   drivers/gpu/host1x/context.c: In function 'host1x_memory_context_list_init':
>> drivers/gpu/host1x/context.c:80:40: error: 'struct iommu_fwspec' has no member named 'ids'
      80 |                 ctx->stream_id = fwspec->ids[0] & 0xffff;
         |                                        ^~


vim +80 drivers/gpu/host1x/context.c

    15	
    16	int host1x_memory_context_list_init(struct host1x *host1x)
    17	{
    18		struct host1x_memory_context_list *cdl = &host1x->context_list;
    19		struct device_node *node = host1x->dev->of_node;
    20		struct host1x_memory_context *ctx;
    21		unsigned int i;
    22		int err;
    23	
    24		cdl->devs = NULL;
    25		cdl->len = 0;
    26		mutex_init(&cdl->lock);
    27	
    28		err = of_property_count_u32_elems(node, "iommu-map");
    29		if (err < 0)
    30			return 0;
    31	
    32		cdl->devs = kcalloc(err, sizeof(*cdl->devs), GFP_KERNEL);
    33		if (!cdl->devs)
    34			return -ENOMEM;
    35		cdl->len = err / 4;
    36	
    37		for (i = 0; i < cdl->len; i++) {
    38			struct iommu_fwspec *fwspec;
    39	
    40			ctx = &cdl->devs[i];
    41	
    42			ctx->host = host1x;
    43	
    44			device_initialize(&ctx->dev);
    45	
    46			/*
    47			 * Due to an issue with T194 NVENC, only 38 bits can be used.
    48			 * Anyway, 256GiB of IOVA ought to be enough for anyone.
    49			 */
    50			ctx->dma_mask = DMA_BIT_MASK(38);
    51			ctx->dev.dma_mask = &ctx->dma_mask;
    52			ctx->dev.coherent_dma_mask = ctx->dma_mask;
    53			dev_set_name(&ctx->dev, "host1x-ctx.%d", i);
    54			ctx->dev.bus = &host1x_context_device_bus_type;
    55			ctx->dev.parent = host1x->dev;
    56	
    57			dma_set_max_seg_size(&ctx->dev, UINT_MAX);
    58	
    59			err = device_add(&ctx->dev);
    60			if (err) {
    61				dev_err(host1x->dev, "could not add context device %d: %d\n", i, err);
    62				goto del_devices;
    63			}
    64	
    65			err = of_dma_configure_id(&ctx->dev, node, true, &i);
    66			if (err) {
    67				dev_err(host1x->dev, "IOMMU configuration failed for context device %d: %d\n",
    68					i, err);
    69				device_del(&ctx->dev);
    70				goto del_devices;
    71			}
    72	
    73			fwspec = dev_iommu_fwspec_get(&ctx->dev);
    74			if (!fwspec) {
    75				dev_err(host1x->dev, "Context device %d has no IOMMU!\n", i);
    76				device_del(&ctx->dev);
    77				goto del_devices;
    78			}
    79	
  > 80			ctx->stream_id = fwspec->ids[0] & 0xffff;
    81		}
    82	
    83		return 0;
    84	
    85	del_devices:
    86		while (i--)
    87			device_del(&cdl->devs[i].dev);
    88	
    89		kfree(cdl->devs);
    90		cdl->len = 0;
    91	
    92		return err;
    93	}
    94
diff mbox series

Patch

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..d7d95b69a72a
--- /dev/null
+++ b/drivers/gpu/host1x/context.c
@@ -0,0 +1,160 @@ 
+// 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"
+
+int host1x_memory_context_list_init(struct host1x *host1x)
+{
+	struct host1x_memory_context_list *cdl = &host1x->context_list;
+	struct device_node *node = host1x->dev->of_node;
+	struct host1x_memory_context *ctx;
+	unsigned int i;
+	int err;
+
+	cdl->devs = NULL;
+	cdl->len = 0;
+	mutex_init(&cdl->lock);
+
+	err = of_property_count_u32_elems(node, "iommu-map");
+	if (err < 0)
+		return 0;
+
+	cdl->devs = kcalloc(err, sizeof(*cdl->devs), GFP_KERNEL);
+	if (!cdl->devs)
+		return -ENOMEM;
+	cdl->len = err / 4;
+
+	for (i = 0; i < cdl->len; i++) {
+		struct iommu_fwspec *fwspec;
+
+		ctx = &cdl->devs[i];
+
+		ctx->host = host1x;
+
+		device_initialize(&ctx->dev);
+
+		/*
+		 * Due to an issue with T194 NVENC, only 38 bits can be used.
+		 * Anyway, 256GiB of IOVA ought to be enough for anyone.
+		 */
+		ctx->dma_mask = DMA_BIT_MASK(38);
+		ctx->dev.dma_mask = &ctx->dma_mask;
+		ctx->dev.coherent_dma_mask = ctx->dma_mask;
+		dev_set_name(&ctx->dev, "host1x-ctx.%d", i);
+		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", i, err);
+			goto del_devices;
+		}
+
+		err = of_dma_configure_id(&ctx->dev, node, true, &i);
+		if (err) {
+			dev_err(host1x->dev, "IOMMU configuration failed for context device %d: %d\n",
+				i, 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", i);
+			device_del(&ctx->dev);
+			goto del_devices;
+		}
+
+		ctx->stream_id = fwspec->ids[0] & 0xffff;
+	}
+
+	return 0;
+
+del_devices:
+	while (i--)
+		device_del(&cdl->devs[i].dev);
+
+	kfree(cdl->devs);
+	cdl->len = 0;
+
+	return err;
+}
+
+void host1x_memory_context_list_free(struct host1x_memory_context_list *cdl)
+{
+	unsigned int i;
+
+	for (i = 0; i < cdl->len; i++)
+		device_del(&cdl->devs[i].dev);
+
+	kfree(cdl->devs);
+	cdl->len = 0;
+}
+
+struct host1x_memory_context *host1x_memory_context_alloc(struct host1x *host1x,
+							  struct pid *pid)
+{
+	struct host1x_memory_context_list *cdl = &host1x->context_list;
+	struct host1x_memory_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_memory_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_GPL(host1x_memory_context_alloc);
+
+void host1x_memory_context_get(struct host1x_memory_context *cd)
+{
+	refcount_inc(&cd->ref);
+}
+EXPORT_SYMBOL_GPL(host1x_memory_context_get);
+
+void host1x_memory_context_put(struct host1x_memory_context *cd)
+{
+	struct host1x_memory_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_GPL(host1x_memory_context_put);
diff --git a/drivers/gpu/host1x/context.h b/drivers/gpu/host1x/context.h
new file mode 100644
index 000000000000..db8ff0a1f4f3
--- /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_memory_context_list {
+	struct mutex lock;
+	struct host1x_memory_context *devs;
+	unsigned int len;
+};
+
+int host1x_memory_context_list_init(struct host1x *host1x);
+void host1x_memory_context_list_free(struct host1x_memory_context_list *cdl);
+
+#endif
diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c
index 80c685ab3e30..89cc79a48eab 100644
--- a/drivers/gpu/host1x/dev.c
+++ b/drivers/gpu/host1x/dev.c
@@ -28,6 +28,7 @@ 
 
 #include "bus.h"
 #include "channel.h"
+#include "context.h"
 #include "debug.h"
 #include "dev.h"
 #include "intr.h"
@@ -503,10 +504,16 @@  static int host1x_probe(struct platform_device *pdev)
 		goto iommu_exit;
 	}
 
+	err = host1x_memory_context_list_init(host);
+	if (err) {
+		dev_err(&pdev->dev, "failed to initialize context list\n");
+		goto free_channels;
+	}
+
 	err = host1x_syncpt_init(host);
 	if (err) {
 		dev_err(&pdev->dev, "failed to initialize syncpts\n");
-		goto free_channels;
+		goto free_contexts;
 	}
 
 	err = host1x_intr_init(host, syncpt_irq);
@@ -550,6 +557,8 @@  static int host1x_probe(struct platform_device *pdev)
 	host1x_intr_deinit(host);
 deinit_syncpt:
 	host1x_syncpt_deinit(host);
+free_contexts:
+	host1x_memory_context_list_free(&host->context_list);
 free_channels:
 	host1x_channel_list_free(&host->channel_list);
 iommu_exit:
@@ -571,6 +580,7 @@  static int host1x_remove(struct platform_device *pdev)
 
 	host1x_intr_deinit(host);
 	host1x_syncpt_deinit(host);
+	host1x_memory_context_list_free(&host->context_list);
 	host1x_channel_list_free(&host->channel_list);
 	host1x_iommu_exit(host);
 	host1x_bo_cache_destroy(&host->cache);
diff --git a/drivers/gpu/host1x/dev.h b/drivers/gpu/host1x/dev.h
index ca4b082f0cd4..7552a4554534 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"
@@ -141,6 +142,7 @@  struct host1x {
 	struct mutex syncpt_mutex;
 
 	struct host1x_channel_list channel_list;
+	struct host1x_memory_context_list context_list;
 
 	struct dentry *debugfs;
 
diff --git a/include/linux/host1x.h b/include/linux/host1x.h
index c0bf4e581fe9..3f368fdb8445 100644
--- a/include/linux/host1x.h
+++ b/include/linux/host1x.h
@@ -446,4 +446,22 @@  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 memory contexts */
+
+struct host1x_memory_context {
+	struct host1x *host;
+
+	refcount_t ref;
+	struct pid *owner;
+
+	struct device dev;
+	u64 dma_mask;
+	u32 stream_id;
+};
+
+struct host1x_memory_context *host1x_memory_context_alloc(struct host1x *host1x,
+							  struct pid *pid);
+void host1x_memory_context_get(struct host1x_memory_context *cd);
+void host1x_memory_context_put(struct host1x_memory_context *cd);
+
 #endif