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Fri, 25 Sep 2020 14:12:31 +0000 (GMT) X-AuditID: cbfec7f2-7efff70000001938-5b-5f6dfacfef32 Received: from eusmtip1.samsung.com ( [203.254.199.221]) by eusmgms1.samsung.com (EUCPMTA) with SMTP id FE.39.06314.FCAFD6F5; Fri, 25 Sep 2020 15:12:31 +0100 (BST) Received: from AMDC2765.digital.local (unknown [106.120.51.73]) by eusmtip1.samsung.com (KnoxPortal) with ESMTPA id 20200925141230eusmtip1b4b74b11e2277e18fef6a5019d2e2f2b~4DENMB_3U1229912299eusmtip1y; Fri, 25 Sep 2020 14:12:30 +0000 (GMT) From: Marek Szyprowski To: Linux IOMMU , linux-media@vger.kernel.org, linux-samsung-soc@vger.kernel.org Cc: Marek Szyprowski , Robin Murphy , Joerg Roedel , Christoph Hellwig , Sylwester Nawrocki , Krzysztof Kozlowski , Bartlomiej Zolnierkiewicz , Tomasz Figa , linux-kernel@vger.kernel.org Subject: [PATCH 1/8] dma-mapping: add DMA_ATTR_LOW_ADDRESS attribute Date: Fri, 25 Sep 2020 16:12:11 +0200 Message-Id: <20200925141218.13550-2-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200925141218.13550-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0WSbUhTURjHObu7d3fD2W0KniwTBgUaqbOgC5ZYWtz6EFKSINS85UWtTWXz JQVrJL4NNU2wobZsOa053RLzZVq5ZToyNd9AwUBjFgZaqYGt1Dav2pfD7zzn9/yfw+HgiEiH +uLJKemMIoWWiTEBt73/9/DREadcGqKv9SNfaEwo+bzpHYesexNGFteYeeTIiGsZt9RiZIn5 JUpqRl5zyOa+TzzS+sOBkoXzCwi5kr+BRXhQDquWQxm1RkDVqEa5VKuhGKMqpxoB1T2twqiy NgOgVloPRuNxgpMJjCw5k1EEh8cLkkz6ejRtiX970rbIU4FSXA34OCSOw8H3E5gaCHAR8QzA PKuVy25WAeyoesJxWyJiBUBbYehOh7OhgsdKjQC+qp/g7HaYR/sRt4UREqheVLtycdybSIcN dk+3gxAODuxZZ1O9iCj4p8nCdTOXOATtk28xNwuJU7D8wybKTvOHTeberUw+EQ7nRnuBOwgS Bh4sKp3nsVIUtGvyuSx7wW8Dbdv1A3Cz6zGHbcgDcG64mcduSgAcv6cBrBUGZ4adW1dFiABo sgS7ERKnoa4YY9ETTi3udcuICx+0P0TYshAWFYjYjMOweqBld6r14xjCMgWd6+Pb71MBYMHc GFYO/Kv/z6oDwAB8mAylPJFRSlKYrCAlLVdmpCQG3UiVtwLXzxncGFjuBL/GrtsAgQOxh9D+ WS4VoXSmMltuAxBHxN7CM0OD10TCBDo7h1GkShUZMkZpA/txrthHeEy3cFVEJNLpzC2GSWMU O6ccnO+rAkVPRbP7JtaIjcrL2khkMPdCeKihz0+fUSMJqTQ6pg3GwLI7X+9Xe6/pogXxjm5H oFoR15JgydXHRlIr9BfZ7KW1mObZPTnxd6d7vms9TvycsbbNS8/ZV88uddou/s3MvlIVYfGi Olrab5pM0V0VsoD1LMOj82hIbMxy5pEhnZirTKIlgYhCSf8DmeqdJDUDAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmphkeLIzCtJLcpLzFFi42I5/e/4Xd3zv3LjDbpO8VpsnLGe1WLl6qNM Fgv2W1t0zt7AbnH+PJC4vGsOm0XPhq2sFjPO72OyWHvkLrvFwQ9PWC3an75ktvjc+o/Ngcfj ycF5TB5r5q1h9JjdcJHFY9OqTjaPyTeWM3rsvtnA5tG3ZRWjx+dNcgEcUXo2RfmlJakKGfnF JbZK0YYWRnqGlhZ6RiaWeobG5rFWRqZK+nY2Kak5mWWpRfp2CXoZ65cuYS14x1lx9dBb9gbG Xo4uRk4OCQETiV/LJrJ3MXJxCAksZZT4eOQcM0RCRuLktAZWCFtY4s+1LjaIok+MEls2HWUD SbAJGEp0ve0Cs0UEyiQ6rmxlBiliFnjDJHH31Q92kISwgIvE79W7WEBsFgFViRNXD4M18ArY Skw48x9qg7zE6g0HwDZzCthJPLx4gLGLkQNom63E/odOExj5FjAyrGIUSS0tzk3PLTbUK07M LS7NS9dLzs/dxAiMgW3Hfm7ewXhpY/AhRgEORiUe3hOPcuOFWBPLiitzDzFKcDArifA6nT0d J8SbklhZlVqUH19UmpNafIjRFOimicxSosn5wPjMK4k3NDU0t7A0NDc2NzazUBLn7RA4GCMk kJ5YkpqdmlqQWgTTx8TBKdXA6PJgjXyaSIa8D9MpcVaDHQzdzz2OflwRwXT5okTF3V/fKqW0 6grcMhmeie+crLN49dfZ7DOF/ZaKSbv0PA7Y2ONSY+1fdODhHPsQ+9JME/+5XwQ9Yw5cMNqj eHfaDe64e5tX9CamWEXPdV+pqRoWlDTrftmRxgfmEknsnDfnTFycrxtkZh2mxFKckWioxVxU nAgAEI6bVpcCAAA= X-CMS-MailID: 20200925141231eucas1p223c342cc989df23e4fc28d97fe3010c5 X-Msg-Generator: CA X-RootMTR: 20200925141231eucas1p223c342cc989df23e4fc28d97fe3010c5 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200925141231eucas1p223c342cc989df23e4fc28d97fe3010c5 References: <20200925141218.13550-1-m.szyprowski@samsung.com> Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org Some devices require to allocate a special buffer (usually for the firmware) just at the beginning of the address space to ensure that all further allocations can be expressed as a positive offset from that special buffer. When IOMMU is used for managing the DMA address space, such requirement can be easily fulfilled, simply by enforcing the 'first-fit' IOVA allocation algorithm. This patch adds a DMA attribute for such case. Signed-off-by: Marek Szyprowski --- include/linux/dma-mapping.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index bb138ac6f5e6..c8c568ba375b 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -66,6 +66,12 @@ * at least read-only at lesser-privileged levels). */ #define DMA_ATTR_PRIVILEGED (1UL << 9) +/* + * DMA_ATTR_LOW_ADDRESS: used to indicate that the buffer should be allocated + * at the lowest possible DMA address, usually just at the beginning of the + * DMA/IOVA address space ('first-fit' allocation algorithm). + */ +#define DMA_ATTR_LOW_ADDRESS (1UL << 10) /* * A dma_addr_t can hold any valid DMA or bus address for the platform.