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Tue, 8 Oct 2024 10:55:23 -0400 (EDT) From: =?UTF-8?q?Matias=20Bj=C3=B8rling?= To: kbusch@kernel.org, hch@lst.de, dlemoal@kernel.org, cassel@kernel.org, linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Cc: =?UTF-8?q?Matias=20Bj=C3=B8rling?= Subject: [PATCH 2/2] nvme: add rotational support Date: Tue, 8 Oct 2024 16:55:03 +0200 Message-ID: <20241008145503.987195-3-m@bjorling.me> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20241008145503.987195-1-m@bjorling.me> References: <20241008145503.987195-1-m@bjorling.me> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable From: Matias Bj=C3=B8rling Rotational devices, such as hard-drives, can be detected using the rotational bit in the namespace independent identify namespace data structure. Make the bit visible to the block layer through the rotational queue setting. Note that rotational devices typically can be used to generate random entropy, the device is therefore also added as a block device that adds entropy. Signed-off-by: Matias Bj=C3=B8rling Reviewed-by: Hannes Reinecke --- drivers/nvme/host/core.c | 5 +++++ include/linux/nvme.h | 1 + 2 files changed, 6 insertions(+) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 9cbef6342c39..a445f13f5a28 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -41,6 +41,7 @@ struct nvme_ns_info { bool is_readonly; bool is_ready; bool is_removed; + bool is_rotational; }; =20 unsigned int admin_timeout =3D 60; @@ -1623,6 +1624,7 @@ static int nvme_ns_info_from_id_cs_indep(struct nvme_= ctrl *ctrl, info->is_shared =3D id->nmic & NVME_NS_NMIC_SHARED; info->is_readonly =3D id->nsattr & NVME_NS_ATTR_RO; info->is_ready =3D id->nstat & NVME_NSTAT_NRDY; + info->is_rotational =3D id->nsfeat & NVME_NS_ROTATIONAL; } kfree(id); return ret; @@ -2170,6 +2172,9 @@ static int nvme_update_ns_info_block(struct nvme_ns *= ns, else lim.features &=3D ~(BLK_FEAT_WRITE_CACHE | BLK_FEAT_FUA); =20 + if (info->is_rotational) + lim.features |=3D BLK_FEAT_ROTATIONAL | BLK_FEAT_ADD_RANDOM; + /* * Register a metadata profile for PI, or the plain non-integrity NVMe * metadata masquerading as Type 0 if supported, otherwise reject block diff --git a/include/linux/nvme.h b/include/linux/nvme.h index 7b2ae2e43544..6d0eebb57544 100644 --- a/include/linux/nvme.h +++ b/include/linux/nvme.h @@ -560,6 +560,7 @@ enum { NVME_NS_FLBAS_LBA_SHIFT =3D 1, NVME_NS_FLBAS_META_EXT =3D 0x10, NVME_NS_NMIC_SHARED =3D 1 << 0, + NVME_NS_ROTATIONAL =3D 1 << 4, NVME_LBAF_RP_BEST =3D 0, NVME_LBAF_RP_BETTER =3D 1, NVME_LBAF_RP_GOOD =3D 2, --=20 2.46.0