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Davis" , Christoph Hellwig , Chenbo Feng , Alistair Strachan , "dri-devel@lists.freedesktop.org" , nd Subject: Re: [PATCH v5 5/5] kselftests: Add dma-heap test Thread-Topic: [PATCH v5 5/5] kselftests: Add dma-heap test Thread-Index: AQHVHN4nXn+cC1NFK0KVQX8Ui8Df66aQKGsA Date: Fri, 7 Jun 2019 13:01:11 +0000 Message-ID: <20190607130110.juiwpliqticwuazn@DESKTOP-E1NTVVP.localdomain> References: <20190607030719.77286-1-john.stultz@linaro.org> <20190607030719.77286-6-john.stultz@linaro.org> In-Reply-To: <20190607030719.77286-6-john.stultz@linaro.org> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: NeoMutt/20180716-849-147d51-dirty x-originating-ip: [217.140.106.53] x-clientproxiedby: LO2P265CA0196.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:9e::16) To AM6PR08MB4104.eurprd08.prod.outlook.com (2603:10a6:20b:a9::31) authentication-results: spf=none (sender IP is ) smtp.mailfrom=Brian.Starkey@arm.com; x-ms-exchange-messagesentrepresentingtype: 1 x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: f3aeb4c1-d64c-412b-337a-08d6eb4836b9 x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600148)(711020)(4605104)(1401327)(4618075)(2017052603328)(7193020);SRVR:AM6PR08MB3878; x-ms-traffictypediagnostic: AM6PR08MB3878: x-ms-exchange-purlcount: 1 nodisclaimer: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:331; x-forefront-prvs: 0061C35778 x-forefront-antispam-report: SFV:NSPM;SFS:(10009020)(346002)(376002)(136003)(39850400004)(396003)(366004)(189003)(199004)(4326008)(229853002)(386003)(6506007)(71200400001)(102836004)(9686003)(6436002)(1076003)(966005)(76176011)(3716004)(71190400001)(6486002)(6116002)(14444005)(99286004)(256004)(8936002)(7416002)(3846002)(52116002)(25786009)(81166006)(72206003)(81156014)(66066001)(8676002)(476003)(86362001)(14454004)(11346002)(6306002)(2906002)(446003)(316002)(58126008)(7736002)(68736007)(6246003)(6512007)(66476007)(305945005)(66556008)(44832011)(66946007)(6916009)(478600001)(53936002)(64756008)(66446008)(54906003)(26005)(186003)(73956011)(486006)(5660300002);DIR:OUT;SFP:1101;SCL:1;SRVR:AM6PR08MB3878;H:AM6PR08MB4104.eurprd08.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;MX:1;A:1; received-spf: None (protection.outlook.com: arm.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: gkBPr8wP8tm0Abua3rOYsfLb+ppi9rbLPH/5R4W08qvoUiMyRTatH/DYZmOzGaxR5jgm+uada4kDeYqwVvzCKsJlLXVSDSNVdJLipX9GQ8Fl+xXDzA7nBEbGB4xxVhh5cMyrRVRywiZbwaW2QzMKclni+WxMOsV8sB/yn9LyBXd2phguR1COCqVkwG/4dYMlngtaXT5YwaOXJKmbzRVZmC6G+WfPiE4b7Xn6gRd6Mm22crol2MY5PsF2y2Ns/EWpC+uhCN2WLjb7ob9/QnnBI8l7ME9gE+1U78lE/p/ZrAoIzXk4ycawSl2jW+mW006DbGH9qCveF8nsKnKwZJ2dI1oEVHkS4OeIhXLXINqEjSykA77Q+qiwTsjkYepAI8YFbvKm9swfzG7cDtWGEKRweLvHbrC8cQBPnFQWf1bruG0= Content-Type: text/plain; charset="us-ascii" Content-ID: <34B941F5B759D5429630941A37587F6B@eurprd08.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-Network-Message-Id: f3aeb4c1-d64c-412b-337a-08d6eb4836b9 X-MS-Exchange-CrossTenant-originalarrivaltime: 07 Jun 2019 13:01:11.1541 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: Brian.Starkey@arm.com X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM6PR08MB3878 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi John, I haven't looked at any selftests before, but is there any advantage to using the test harness? https://www.kernel.org/doc/html/v5.1/dev-tools/kselftest.html#test-harness Couple of minor things below On Fri, Jun 07, 2019 at 03:07:19AM +0000, John Stultz wrote: > Add very trivial allocation and import test for dma-heaps, > utilizing the vgem driver as a test importer. >=20 > A good chunk of this code taken from: > tools/testing/selftests/android/ion/ionmap_test.c > Originally by Laura Abbott >=20 > Cc: Benjamin Gaignard > Cc: Sumit Semwal > Cc: Liam Mark > Cc: Pratik Patel > Cc: Brian Starkey > Cc: Vincent Donnefort > Cc: Sudipto Paul > Cc: Andrew F. Davis > Cc: Christoph Hellwig > Cc: Chenbo Feng > Cc: Alistair Strachan > Cc: dri-devel@lists.freedesktop.org > Reviewed-by: Benjamin Gaignard > Signed-off-by: John Stultz > Change-Id: Ib98569fdda6378eb086b8092fb5d6bd419b8d431 > --- > v2: > * Switched to use reworked dma-heap apis > v3: > * Add simple mmap > * Utilize dma-buf testdev to test importing > v4: > * Rework to use vgem > * Pass in fd_flags to match interface changes > * Skip . and .. dirs > --- > tools/testing/selftests/dmabuf-heaps/Makefile | 11 + > .../selftests/dmabuf-heaps/dmabuf-heap.c | 232 ++++++++++++++++++ > 2 files changed, 243 insertions(+) > create mode 100644 tools/testing/selftests/dmabuf-heaps/Makefile > create mode 100644 tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c >=20 > diff --git a/tools/testing/selftests/dmabuf-heaps/Makefile b/tools/testin= g/selftests/dmabuf-heaps/Makefile > new file mode 100644 > index 000000000000..c414ad36b4bf > --- /dev/null > +++ b/tools/testing/selftests/dmabuf-heaps/Makefile > @@ -0,0 +1,11 @@ > +# SPDX-License-Identifier: GPL-2.0 > +CFLAGS +=3D -static -O3 -Wl,-no-as-needed -Wall > +#LDLIBS +=3D -lrt -lpthread -lm > + > +# these are all "safe" tests that don't modify > +# system time or require escalated privileges > +TEST_GEN_PROGS =3D dmabuf-heap > + newline > + > +include ../lib.mk > + > diff --git a/tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c b/tools/t= esting/selftests/dmabuf-heaps/dmabuf-heap.c > new file mode 100644 > index 000000000000..33d4b105c673 > --- /dev/null > +++ b/tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c > @@ -0,0 +1,232 @@ > +// SPDX-License-Identifier: GPL-2.0 > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#include > +#include > + > + > +#include "../../../../include/uapi/linux/dma-heap.h" > + > +#define DEVPATH "/dev/dma_heap" > + > +int check_vgem(int fd) Functions can be static > +{ > + drm_version_t version =3D { 0 }; > + char name[5]; > + int ret; > + > + version.name_len =3D 4; > + version.name =3D name; > + > + ret =3D ioctl(fd, DRM_IOCTL_VERSION, &version); > + if (ret) > + return 1; > + > + return strcmp(name, "vgem"); > +} > + > +int open_vgem(void) > +{ > + int i, fd; > + const char *drmstr =3D "/dev/dri/card"; > + > + fd =3D -1; > + for (i =3D 0; i < 16; i++) { > + char name[80]; > + > + sprintf(name, "%s%u", drmstr, i); > + > + fd =3D open(name, O_RDWR); > + if (fd < 0) > + continue; > + > + if (check_vgem(fd)) { It's a minor thing, but the naming vs the logic reads backwards to me here. I'd expect check_vgem() to return true for vgem. > + close(fd); > + continue; > + } else { > + break; > + } > + > + } > + return fd; > +} > + > +int import_vgem_fd(int vgem_fd, int dma_buf_fd, uint32_t *handle) > +{ > + struct drm_prime_handle import_handle =3D { 0 }; > + int ret; > + > + import_handle.fd =3D dma_buf_fd; > + import_handle.flags =3D 0; > + import_handle.handle =3D 0; You could just initialise import_handle directly. Same for the other functions > + > + ret =3D ioctl(vgem_fd, DRM_IOCTL_PRIME_FD_TO_HANDLE, &import_handle); > + if (ret =3D=3D 0) > + *handle =3D import_handle.handle; > + return ret; > +} > + > +void close_handle(int vgem_fd, uint32_t handle) > +{ > + struct drm_gem_close close =3D { 0 }; > + > + close.handle =3D handle; > + ioctl(vgem_fd, DRM_IOCTL_GEM_CLOSE, &close); > +} > + > + > +int dmabuf_heap_open(char *name) > +{ > + int ret, fd; > + char buf[256]; > + > + ret =3D sprintf(buf, "%s/%s", DEVPATH, name); > + if (ret < 0) { > + printf("sprintf failed!\n"); > + return ret; > + } > + > + fd =3D open(buf, O_RDWR); > + if (fd < 0) > + printf("open %s failed!\n", buf); > + return fd; > +} > + > +int dmabuf_heap_alloc(int fd, size_t len, unsigned int flags, int *dmabu= f_fd) > +{ > + struct dma_heap_allocation_data data =3D { > + .len =3D len, > + .fd_flags =3D O_RDWR | O_CLOEXEC, > + .heap_flags =3D flags, > + }; Like this :-) > + int ret; > + > + if (dmabuf_fd =3D=3D NULL) > + return -EINVAL; > + > + ret =3D ioctl(fd, DMA_HEAP_IOC_ALLOC, &data); > + if (ret < 0) > + return ret; > + *dmabuf_fd =3D (int)data.fd; > + return ret; > +} > + > +void dmabuf_sync(int fd, int start_stop) > +{ > + struct dma_buf_sync sync =3D { 0 }; > + int ret; > + > + sync.flags =3D start_stop | DMA_BUF_SYNC_RW; > + ret =3D ioctl(fd, DMA_BUF_IOCTL_SYNC, &sync); > + if (ret) > + printf("sync failed %d\n", errno); > + newline > +} > + > +#define ONE_MEG (1024*1024) > + > +void do_test(char *heap_name) > +{ > + int heap_fd =3D -1, dmabuf_fd =3D -1, importer_fd =3D -1; > + uint32_t handle =3D 0; > + void *p =3D NULL; > + int ret; > + > + printf("Testing heap: %s\n", heap_name); > + > + heap_fd =3D dmabuf_heap_open(heap_name); > + if (heap_fd < 0) > + return; > + > + printf("Allocating 1 MEG\n"); > + ret =3D dmabuf_heap_alloc(heap_fd, ONE_MEG, 0, &dmabuf_fd); > + if (ret) It'd be good to print something here so you can easily tell if allocations are failing. > + goto out; > + > + /* mmap and write a simple pattern */ > + p =3D mmap(NULL, > + ONE_MEG, > + PROT_READ | PROT_WRITE, > + MAP_SHARED, > + dmabuf_fd, > + 0); > + if (p =3D=3D MAP_FAILED) { > + printf("mmap() failed: %m\n"); > + goto out; > + } > + printf("mmap passed\n"); > + > + > + dmabuf_sync(dmabuf_fd, DMA_BUF_SYNC_START); > + > + memset(p, 1, ONE_MEG/2); > + memset((char *)p+ONE_MEG/2, 0, ONE_MEG/2); Are the selftests using the kernel coding style? If so, there's some spaces missing. > + dmabuf_sync(dmabuf_fd, DMA_BUF_SYNC_END); > + > + importer_fd =3D open_vgem(); > + if (importer_fd < 0) { > + ret =3D importer_fd; > + printf("Failed to open vgem\n"); > + goto out; > + } > + > + ret =3D import_vgem_fd(importer_fd, dmabuf_fd, &handle); > + if (ret < 0) { > + printf("Failed to import buffer\n"); > + goto out; > + } > + printf("import passed\n"); > + > + dmabuf_sync(dmabuf_fd, DMA_BUF_SYNC_START); > + memset(p, 0xff, ONE_MEG); > + dmabuf_sync(dmabuf_fd, DMA_BUF_SYNC_END); > + printf("syncs passed\n"); > + > + close_handle(importer_fd, handle); > + ret =3D 0; No need for this > + > +out: > + if (p) > + munmap(p, ONE_MEG); > + if (importer_fd >=3D 0) > + close(importer_fd); > + if (dmabuf_fd >=3D 0) > + close(dmabuf_fd); > + if (heap_fd >=3D 0) > + close(heap_fd); > +} > + > + > +int main(void) > +{ > + DIR *d; > + struct dirent *dir; > + > + d =3D opendir(DEVPATH); > + if (!d) { > + printf("No %s directory?\n", DEVPATH); > + return -1; > + } > + > + while ((dir =3D readdir(d)) !=3D NULL) { > + if (!strncmp(dir->d_name, ".", 2)) > + continue; > + if (!strncmp(dir->d_name, "..", 3)) > + continue; > + > + do_test(dir->d_name); > + } > + I know it's only a test, and you're about to exit, but you should probably still closedir() in case someone copies this code. Cheers, -Brian > + return 0; > +} > --=20 > 2.17.1 >=20