Linaro-mm-sig February 2024

linaro-mm-sig@lists.linaro.org

17 participants
45 discussions

Re: [PATCH 03/11] drm/mediatek: Rename "mtk_drm_plane" to "mtk_plane"

by AngeloGioacchino Del Regno

Il 26/02/24 09:50, Shawn Sung ha scritto: > From: Hsiao Chien Sung <shawn.sung(a)mediatek.corp-partner.google.com> > > Rename all "mtk_drm_plane" to "mtk_plane": > - To align the naming rule > - To reduce the code size > > Signed-off-by: Hsiao Chien Sung <shawn.sung(a)mediatek.corp-partner.google.com> Reviewed-by: AngeloGiaocchino Del Regno <angelogioacchino.delregno(a)collabora.com>

10 months

Re: [PATCH 04/11] drm/mediatek: Rename "mtk_drm_gem" to "mtk_gem"

by AngeloGioacchino Del Regno

Il 26/02/24 09:50, Shawn Sung ha scritto: > From: Hsiao Chien Sung <shawn.sung(a)mediatek.corp-partner.google.com> > > Rename all "mtk_drm_gem" to "mtk_gem": > - To align the naming rule > - To reduce the code size > > Signed-off-by: Hsiao Chien Sung <shawn.sung(a)mediatek.corp-partner.google.com> Reviewed-by: AngeloGiaocchino Del Regno <angelogioacchino.delregno(a)collabora.com>

10 months

Re: [PATCH 06/11] drm/mediatek: Rename files "mtk_drm_crtc.*" to "mtk_crtc.*"

by AngeloGioacchino Del Regno

Il 26/02/24 09:50, Shawn Sung ha scritto: > From: Hsiao Chien Sung <shawn.sung(a)mediatek.corp-partner.google.com> > > Rename files mtk_drm_crtc.* to mtk_crtc.*. > > Signed-off-by: Hsiao Chien Sung <shawn.sung(a)mediatek.corp-partner.google.com> Reviewed-by: AngeloGiaocchino Del Regno <angelogioacchino.delregno(a)collabora.com>

10 months

Re: [PATCH 07/11] drm/mediatek: Rename files "mtk_drm_ddp_comp.*" to "mtk_ddp_comp.*"

by AngeloGioacchino Del Regno

Il 26/02/24 09:50, Shawn Sung ha scritto: > From: Hsiao Chien Sung <shawn.sung(a)mediatek.corp-partner.google.com> > > Rename files mtk_drm_ddp_comp.* to mtk_ddp_comp.*. > > Signed-off-by: Hsiao Chien Sung <shawn.sung(a)mediatek.corp-partner.google.com> Reviewed-by: AngeloGiaocchino Del Regno <angelogioacchino.delregno(a)collabora.com>

10 months

Re: [PATCH 08/11] drm/mediatek: Rename files "mtk_drm_plane.*" to "mtk_plane.*"

by AngeloGioacchino Del Regno

Il 26/02/24 09:50, Shawn Sung ha scritto: > From: Hsiao Chien Sung <shawn.sung(a)mediatek.corp-partner.google.com> > > Rename files mtk_drm_plane.* to mtk_plane.*. > > Signed-off-by: Hsiao Chien Sung <shawn.sung(a)mediatek.corp-partner.google.com> Reviewed-by: AngeloGiaocchino Del Regno <angelogioacchino.delregno(a)collabora.com>

10 months

Re: [PATCH 09/11] drm/mediatek: Rename files "mtk_drm_gem.*" to "mtk_gem.*"

by AngeloGioacchino Del Regno

Il 26/02/24 09:50, Shawn Sung ha scritto: > From: Hsiao Chien Sung <shawn.sung(a)mediatek.corp-partner.google.com> > > Rename files mtk_drm_gem.* to mtk_gem.*. > > Signed-off-by: Hsiao Chien Sung <shawn.sung(a)mediatek.corp-partner.google.com> Reviewed-by: AngeloGiaocchino Del Regno <angelogioacchino.delregno(a)collabora.com>

10 months

Re: [PATCH 10/11] drm/mediatek: Rename mtk_ddp_comp functions

by AngeloGioacchino Del Regno

Il 26/02/24 09:50, Shawn Sung ha scritto: > From: Hsiao Chien Sung <shawn.sung(a)mediatek.corp-partner.google.com> > > Rename functions of mtk_ddp_comp: > - To align the naming rule > - To reduce the code size > > Signed-off-by: Hsiao Chien Sung <shawn.sung(a)mediatek.corp-partner.google.com> Reviewed-by: AngeloGiaocchino Del Regno <angelogioacchino.delregno(a)collabora.com>

10 months

Re: [PATCH v5] drm/test: add a test suite for GEM objects backed by shmem

by Guenter Roeck

On Thu, Feb 22, 2024 at 05:33:48PM +0100, Marco Pagani wrote: > > > > In this context, the TTM unit tests fail as well in qemu, with worse result: > > It seems there is some bad cleanup after a failed test case, causing list > > corruptions in the drm core and ultimately a crash. I don't know if this > > is also caused by the missing dma_mask initialization. > > > > That's interesting. Which --arch argument are you using to run the > tests with QEMU? Example (I am not sure if any of those parameters matters; it is just one of my tests): qemu-system-x86_64 -kernel arch/x86/boot/bzImage -M q35 -cpu IvyBridge \ -no-reboot -snapshot -smp 2 \ -device e1000,netdev=net0 -netdev user,id=net0 -m 512 \ -drive file=rootfs.ext2,format=raw,if=ide \ --append "earlycon=uart8250,io,0x3f8,9600n8 root=/dev/sda1 console=ttyS0" \ -d unimp,guest_errors -nographic -monitor none This results in: [ ... ] [ 5.989496] KTAP version 1 [ 5.989639] # Subtest: ttm_device [ 5.989711] # module: ttm_device_test [ 5.989760] 1..5 [ 6.002044] ok 1 ttm_device_init_basic [ 6.013557] ok 2 ttm_device_init_multiple ILLOPC: ffffffffb8ac9350: 0f 0b [ 6.022481] ok 3 ttm_device_fini_basic [ 6.026172] ------------[ cut here ]------------ [ 6.026315] WARNING: CPU: 1 PID: 1575 at drivers/gpu/drm/ttm/ttm_device.c:206 ttm_device_init+0x170/0x190 ... [ 6.135016] ok 3 Above the allocation limit [ 6.138759] ------------[ cut here ]------------ [ 6.138925] WARNING: CPU: 1 PID: 1595 at kernel/dma/mapping.c:503 dma_alloc_attrs+0xf6/0x100 ... [ 6.143850] # ttm_pool_alloc_basic: ASSERTION FAILED at drivers/gpu/drm/ttm/tests/ttm_pool_test.c:162 [ 6.143850] Expected err == 0, but [ 6.143850] err == -12 (0xfffffffffffffff4) [ 6.148824] not ok 4 One page, with coherent DMA mappings enabled From there things go downhill. [ 6.152821] list_add corruption. prev->next should be next (ffffffffbbd53950), but was 0000000000000000. (prev=ffff8af1c38f9e20). and so on until the emulation crashes. Guenter

10 months

Re: [PATCH v5] drm/test: add a test suite for GEM objects backed by shmem

by Guenter Roeck

Hi Marco, On 2/22/24 07:32, Marco Pagani wrote: > > > On 2024-02-18 16:49, Guenter Roeck wrote: >> Hi, >> >> On Thu, Nov 30, 2023 at 06:14:16PM +0100, Marco Pagani wrote: >>> This patch introduces an initial KUnit test suite for GEM objects >>> backed by shmem buffers. >>> >>> Suggested-by: Javier Martinez Canillas <javierm(a)redhat.com> >>> Signed-off-by: Marco Pagani <marpagan(a)redhat.com> >> >> When running this in qemu, I get lots of warnings backtraces in the drm >> core. >> >> WARNING: CPU: 0 PID: 1341 at drivers/gpu/drm/drm_gem_shmem_helper.c:327 >> WARNING: CPU: 0 PID: 1341 at drivers/gpu/drm/drm_gem_shmem_helper.c:173 >> WARNING: CPU: 0 PID: 1341 at drivers/gpu/drm/drm_gem_shmem_helper.c:385 >> WARNING: CPU: 0 PID: 1341 at drivers/gpu/drm/drm_gem_shmem_helper.c:211 >> WARNING: CPU: 0 PID: 1345 at kernel/dma/mapping.c:194 >> WARNING: CPU: 0 PID: 1347 at drivers/gpu/drm/drm_gem_shmem_helper.c:429 >> WARNING: CPU: 0 PID: 1349 at drivers/gpu/drm/drm_gem_shmem_helper.c:445 >> >> It looks like dma_resv_assert_held() asserts each time it is executed. >> The backtrace in kernel/dma/mapping.c is triggered by >> if (WARN_ON_ONCE(!dev->dma_mask)) >> return 0; >> in __dma_map_sg_attrs(). >> >> Is this a possible problem in the test code, or can it be caused by >> some limitations or bugs in the qemu emulation ? If so, do you have any >> thoughts or ideas what those limitations / bugs might be ? > > Hi Guenter, > > Thanks for reporting this issue. As you correctly noted, the warnings appear to > be caused by the dma_mask in the mock device being uninitialized. I'll send a > patch to fix it soon. > Thanks a lot for the update. In this context, the TTM unit tests fail as well in qemu, with worse result: It seems there is some bad cleanup after a failed test case, causing list corruptions in the drm core and ultimately a crash. I don't know if this is also caused by the missing dma_mask initialization. Thanks, Guenter

10 months

[PATCH v2] udmabuf: Fix a potential (and unlikely) access to unallocated memory

by Christophe JAILLET

If 'list_limit' is set to a very high value, 'lsize' computation could overflow if 'head.count' is big enough. In such a case, udmabuf_create() would access to memory beyond 'list'. Use memdup_array_user() which checks for overflow. While at it, include <linux/string.h>. Fixes: fbb0de795078 ("Add udmabuf misc device") Signed-off-by: Christophe JAILLET <christophe.jaillet(a)wanadoo.fr> --- v2: - Use memdup_array_user() [Kees Cook] - Use sizeof(*list) [Gustavo A. R. Silva] - Add include <linux/string.h> v1: https://lore.kernel.org/all/3e37f05c7593f1016f0a46de188b3357cbbd0c0b.169506… Signed-off-by: Christophe JAILLET <christophe.jaillet(a)wanadoo.fr> --- drivers/dma-buf/udmabuf.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c index c40645999648..5728948ea6f2 100644 --- a/drivers/dma-buf/udmabuf.c +++ b/drivers/dma-buf/udmabuf.c @@ -11,6 +11,7 @@ #include <linux/module.h> #include <linux/shmem_fs.h> #include <linux/slab.h> +#include <linux/string.h> #include <linux/udmabuf.h> #include <linux/vmalloc.h> #include <linux/iosys-map.h> @@ -314,14 +315,13 @@ static long udmabuf_ioctl_create_list(struct file *filp, unsigned long arg) struct udmabuf_create_list head; struct udmabuf_create_item *list; int ret = -EINVAL; - u32 lsize; if (copy_from_user(&head, (void __user *)arg, sizeof(head))) return -EFAULT; if (head.count > list_limit) return -EINVAL; - lsize = sizeof(struct udmabuf_create_item) * head.count; - list = memdup_user((void __user *)(arg + sizeof(head)), lsize); + list = memdup_array_user((void __user *)(arg + sizeof(head)), + sizeof(*list), head.count); if (IS_ERR(list)) return PTR_ERR(list); -- 2.43.2

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Linaro-mm-sig February 2024