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Date: Mon, 28 Nov 2022 21:18:29 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Asutosh Das <quic_asutoshd@...cinc.com>
Cc: quic_cang@...cinc.com, martin.petersen@...cle.com,
linux-scsi@...r.kernel.org, quic_nguyenb@...cinc.com,
quic_xiaosenh@...cinc.com, stanley.chu@...iatek.com,
eddie.huang@...iatek.com, daejun7.park@...sung.com,
bvanassche@....org, avri.altman@....com, beanhuo@...ron.com,
linux-arm-msm@...r.kernel.org,
Alim Akhtar <alim.akhtar@...sung.com>,
"James E.J. Bottomley" <jejb@...ux.ibm.com>,
Jinyoung Choi <j-young.choi@...sung.com>,
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
Kiwoong Kim <kwmad.kim@...sung.com>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 08/16] ufs: core: mcq: Allocate memory for mcq mode
On Tue, Nov 22, 2022 at 08:10:21PM -0800, Asutosh Das wrote:
> To read the bqueuedepth, the device descriptor is fetched
> in Single Doorbell Mode. This allocated memory may not be
> enough for MCQ mode because the number of tags supported
> in MCQ mode may be larger than in SDB mode.
> Hence, release the memory allocated in SDB mode and allocate
> memory for MCQ mode operation.
> Define the ufs hardware queue and Completion Queue Entry.
>
> Co-developed-by: Can Guo <quic_cang@...cinc.com>
> Signed-off-by: Can Guo <quic_cang@...cinc.com>
> Signed-off-by: Asutosh Das <quic_asutoshd@...cinc.com>
> ---
> drivers/ufs/core/ufs-mcq.c | 58 ++++++++++++++++++++++++++++++++++++++++--
> drivers/ufs/core/ufshcd-priv.h | 1 +
> drivers/ufs/core/ufshcd.c | 42 +++++++++++++++++++++++++++---
> include/ufs/ufshcd.h | 19 ++++++++++++++
> include/ufs/ufshci.h | 22 ++++++++++++++++
> 5 files changed, 137 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
> index e95f748..51f0e40 100644
> --- a/drivers/ufs/core/ufs-mcq.c
> +++ b/drivers/ufs/core/ufs-mcq.c
> @@ -247,15 +247,69 @@ static int ufshcd_mcq_config_nr_queues(struct ufs_hba *hba)
> return 0;
> }
>
> +int ufshcd_mcq_memory_alloc(struct ufs_hba *hba)
> +{
> + struct ufs_hw_queue *hwq;
> + size_t utrdl_size, cqe_size;
> + int i;
> +
> + for (i = 0; i < hba->nr_hw_queues; i++) {
> + hwq = &hba->uhq[i];
> +
> + utrdl_size = sizeof(struct utp_transfer_req_desc) *
> + hwq->max_entries;
> + hwq->sqe_base_addr = dmam_alloc_coherent(hba->dev, utrdl_size,
> + &hwq->sqe_dma_addr,
> + GFP_KERNEL);
> + if (!hwq->sqe_dma_addr) {
> + dev_err(hba->dev, "SQE allocation failed\n");
> + return -ENOMEM;
> + }
> +
> + cqe_size = sizeof(struct cq_entry) * hwq->max_entries;
> + hwq->cqe_base_addr = dmam_alloc_coherent(hba->dev, cqe_size,
> + &hwq->cqe_dma_addr,
> + GFP_KERNEL);
> + if (!hwq->cqe_dma_addr) {
> + dev_err(hba->dev, "CQE allocation failed\n");
> + return -ENOMEM;
> + }
> + }
> +
> + return 0;
> +}
> +
> int ufshcd_mcq_init(struct ufs_hba *hba)
> {
> - int ret;
> + struct ufs_hw_queue *hwq;
> + int ret, i;
>
> ret = ufshcd_mcq_config_nr_queues(hba);
> if (ret)
> return ret;
>
> ret = ufshcd_mcq_config_resource(hba);
> - return ret;
> + if (ret)
> + return ret;
> +
> + hba->uhq = devm_kzalloc(hba->dev,
> + hba->nr_hw_queues * sizeof(struct ufs_hw_queue),
> + GFP_KERNEL);
> + if (!hba->uhq) {
> + dev_err(hba->dev, "ufs hw queue memory allocation failed\n");
> + return -ENOMEM;
> + }
> +
> + for (i = 0; i < hba->nr_hw_queues; i++) {
> + hwq = &hba->uhq[i];
> + hwq->max_entries = hba->nutrs;
> + }
> +
> + /* The very first HW queue serves device commands */
> + hba->dev_cmd_queue = &hba->uhq[0];
> + /* Give dev_cmd_queue the minimal number of entries */
> + hba->dev_cmd_queue->max_entries = MAX_DEV_CMD_ENTRIES;
> +
> + return 0;
> }
>
> diff --git a/drivers/ufs/core/ufshcd-priv.h b/drivers/ufs/core/ufshcd-priv.h
> index 9f40fa5..4d2bde2 100644
> --- a/drivers/ufs/core/ufshcd-priv.h
> +++ b/drivers/ufs/core/ufshcd-priv.h
> @@ -63,6 +63,7 @@ int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
> void ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit);
> int ufshcd_mcq_init(struct ufs_hba *hba);
> int ufshcd_mcq_decide_queue_depth(struct ufs_hba *hba);
> +int ufshcd_mcq_memory_alloc(struct ufs_hba *hba);
>
> #define SD_ASCII_STD true
> #define SD_RAW false
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index ae065da..45686e8 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -3740,6 +3740,12 @@ static int ufshcd_memory_alloc(struct ufs_hba *hba)
> }
>
> /*
> + * Not freed if MCQ is configured see ufshcd_release_sdb_queue() and
> + * ufshcd_config_mcq()
The comment is vague. Use something like,
"Skip allocating memory for utmrdl if it has been allocated during the first
pass (i.e., prior to MCQ enablement)"
> + */
> + if (hba->utmrdl_base_addr)
> + goto skip_utmrdl;
> + /*
> * Allocate memory for UTP Task Management descriptors
> * UFSHCI requires 1024 byte alignment of UTMRD
> */
> @@ -3755,6 +3761,7 @@ static int ufshcd_memory_alloc(struct ufs_hba *hba)
> goto out;
> }
>
> +skip_utmrdl:
> /* Allocate memory for local reference block */
> hba->lrb = devm_kcalloc(hba->dev,
> hba->nutrs, sizeof(struct ufshcd_lrb),
> @@ -8197,6 +8204,22 @@ static int ufshcd_add_lus(struct ufs_hba *hba)
> return ret;
> }
>
> +/* SDB - Single Doorbell */
> +static void ufshcd_release_sdb_queue(struct ufs_hba *hba, int nutrs)
> +{
> + size_t ucdl_size, utrdl_size;
> +
> + ucdl_size = sizeof(struct utp_transfer_cmd_desc) * nutrs;
> + dmam_free_coherent(hba->dev, ucdl_size, hba->ucdl_base_addr,
> + hba->ucdl_dma_addr);
> +
> + utrdl_size = sizeof(struct utp_transfer_req_desc) * nutrs;
> + dmam_free_coherent(hba->dev, utrdl_size, hba->utrdl_base_addr,
> + hba->utrdl_dma_addr);
> +
> + devm_kfree(hba->dev, hba->lrb);
> +}
> +
> static int ufshcd_alloc_mcq(struct ufs_hba *hba)
> {
> int ret;
> @@ -8208,12 +8231,25 @@ static int ufshcd_alloc_mcq(struct ufs_hba *hba)
>
> hba->nutrs = ret;
> ret = ufshcd_mcq_init(hba);
> - if (ret) {
> - hba->nutrs = old_nutrs;
> - return ret;
> + if (ret)
> + goto err;
> +
A comment should be added here on why the allocation happens again even though
it is part of the commit description. This helps while going through the code
later.
> + if (hba->nutrs != old_nutrs) {
> + ufshcd_release_sdb_queue(hba, old_nutrs);
> + ret = ufshcd_memory_alloc(hba);
> + if (ret)
> + goto err;
> + ufshcd_host_memory_configure(hba);
> }
>
> + ret = ufshcd_mcq_memory_alloc(hba);
> + if (ret)
> + goto err;
> +
> return 0;
> +err:
> + hba->nutrs = old_nutrs;
> + return ret;
> }
>
> /**
> diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
> index e03b310..e478bab 100644
> --- a/include/ufs/ufshcd.h
> +++ b/include/ufs/ufshcd.h
> @@ -863,6 +863,8 @@ enum ufshcd_res {
> * @nr_queues: number of Queues of different queue types
> * @res: array of resource info of MCQ registers
> * @mcq_base: Multi circular queue registers base address
> + * @uhq: array of supported hardware queues
> + * @dev_cmd_queue: Queue for issuing device management commands
> */
> struct ufs_hba {
> void __iomem *mmio_base;
> @@ -1018,6 +1020,23 @@ struct ufs_hba {
> unsigned int nr_queues[HCTX_MAX_TYPES];
> struct ufshcd_res_info res[RES_MAX];
> void __iomem *mcq_base;
> + struct ufs_hw_queue *uhq;
> + struct ufs_hw_queue *dev_cmd_queue;
> +};
> +
> +/**
Kernel doc requires the description of the struct itself.
> + * @sqe_base_addr: submission queue entry base address
> + * @sqe_dma_addr: submission queue dma address
> + * @cqe_base_addr: completion queue base address
> + * @cqe_dma_addr: completion queue dma address
> + * @max_entries: max number of slots in this hardware queue
> + */
> +struct ufs_hw_queue {
> + void *sqe_base_addr;
> + dma_addr_t sqe_dma_addr;
> + struct cq_entry *cqe_base_addr;
> + dma_addr_t cqe_dma_addr;
> + u32 max_entries;
> };
>
> /* Returns true if clocks can be gated. Otherwise false */
> diff --git a/include/ufs/ufshci.h b/include/ufs/ufshci.h
> index 67fcebd..1aae5b2 100644
> --- a/include/ufs/ufshci.h
> +++ b/include/ufs/ufshci.h
> @@ -486,6 +486,28 @@ struct utp_transfer_req_desc {
> __le16 prd_table_offset;
> };
>
> +/* MCQ Completion Queue Entry */
> +struct cq_entry {
> + /* DW 0-1 */
> + __le64 command_desc_base_addr;
> +
> + /* DW 2 */
> + __le16 response_upiu_length;
> + __le16 response_upiu_offset;
> +
> + /* DW 3 */
> + __le16 prd_table_length;
> + __le16 prd_table_offset;
> +
> + /* DW 4 */
> + __le32 status;
> +
> + /* DW 5-7 */
> + u32 reserved[3];
It'd be good to use __le32 for the sake of uniformity even though these 3
DWORDS are reserved.
Thanks,
Mani
> +};
> +
> +static_assert(sizeof(struct cq_entry) == 32);
> +
> /*
> * UTMRD structure.
> */
> --
> 2.7.4
>
--
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