[PATCH v4 02/16] ufs: core: Probe for ext_iid support

Asutosh Das
2022-11-09T19:43:34Z

Task Tag is limited to 8 bits and this restricts the number
of active IOs to 255.
In Multi-circular queue mode, this may not be enough.
The specification provides EXT_IID which can be used to increase
the number of IOs if the UFS device and UFSHC support it.
This patch adds support to probe for ext_iid support in
ufs device and UFSHC.

Co-developed-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
---
drivers/ufs/core/ufshcd.c | 31 +++++++++++++++++++++++++++++++
include/ufs/ufs.h | 4 ++++
include/ufs/ufshcd.h | 4 ++++
include/ufs/ufshci.h | 7 +++++++
4 files changed, 46 insertions(+)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index c9d7b78..66b797f 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -2258,6 +2258,10 @@ static inline int ufshcd_hba_capabilities(struct ufs_hba *hba)
if (err)
dev_err(hba->dev, "crypto setup failed\n");

+ hba->mcq_capabilities = ufshcd_readl(hba, REG_MCQCAP);
+ hba->ext_iid_sup = FIELD_GET(MASK_EXT_IID_SUPPORT,
+ hba->mcq_capabilities);
+
return err;
}

@@ -7663,6 +7667,30 @@ static void ufshcd_temp_notif_probe(struct ufs_hba *hba, const u8 *desc_buf)
}
}

+static void ufshcd_ext_iid_probe(struct ufs_hba *hba, u8 *desc_buf)
+{
+ struct ufs_dev_info *dev_info = &hba->dev_info;
+ u32 ext_ufs_feature;
+ u32 ext_iid_en = 0;
+ int err;
+
+ /* Only UFS-4.0 and above may support EXT_IID */
+ if (dev_info->wspecversion < 0x400)
+ goto out;
+
+ ext_ufs_feature = ufs_get_ext_ufs_feature(hba, desc_buf);
+ if (!(ext_ufs_feature & UFS_DEV_EXT_IID_SUP))
+ goto out;
+
+ err = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR,
+ QUERY_ATTR_IDN_EXT_IID_EN, 0, 0, &ext_iid_en);
+ if (err)
+ dev_err(hba->dev, "failed reading bEXTIIDEn. err = %d\n", err);
+
+out:
+ dev_info->b_ext_iid_en = ext_iid_en;
+}
+
void ufshcd_fixup_dev_quirks(struct ufs_hba *hba,
const struct ufs_dev_quirk *fixups)
{
@@ -7761,6 +7789,9 @@ static int ufs_get_device_desc(struct ufs_hba *hba)

ufshcd_temp_notif_probe(hba, desc_buf);

+ if (hba->ext_iid_sup)
+ ufshcd_ext_iid_probe(hba, desc_buf);
+
/*
* ufshcd_read_string_desc returns size of the string
* reset the error value
diff --git a/include/ufs/ufs.h b/include/ufs/ufs.h
index 1bba3fe..ba2a1d8 100644
--- a/include/ufs/ufs.h
+++ b/include/ufs/ufs.h
@@ -165,6 +165,7 @@ enum attr_idn {
QUERY_ATTR_IDN_AVAIL_WB_BUFF_SIZE = 0x1D,
QUERY_ATTR_IDN_WB_BUFF_LIFE_TIME_EST = 0x1E,
QUERY_ATTR_IDN_CURR_WB_BUFF_SIZE = 0x1F,
+ QUERY_ATTR_IDN_EXT_IID_EN = 0x2A,
};

/* Descriptor idn for Query requests */
@@ -352,6 +353,7 @@ enum {
UFS_DEV_EXT_TEMP_NOTIF = BIT(6),
UFS_DEV_HPB_SUPPORT = BIT(7),
UFS_DEV_WRITE_BOOSTER_SUP = BIT(8),
+ UFS_DEV_EXT_IID_SUP = BIT(16),
};
#define UFS_DEV_HPB_SUPPORT_VERSION 0x310

@@ -601,6 +603,8 @@ struct ufs_dev_info {

bool b_rpm_dev_flush_capable;
u8 b_presrv_uspc_en;
+ /* UFS EXT_IID Enable */
+ bool b_ext_iid_en;
};

/*
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index 5cf81df..aec37cb9 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -747,6 +747,7 @@ struct ufs_hba_monitor {
* @outstanding_lock: Protects @outstanding_reqs.
* @outstanding_reqs: Bits representing outstanding transfer requests
* @capabilities: UFS Controller Capabilities
+ * @mcq_capabilities: UFS Multi Circular Queue capabilities
* @nutrs: Transfer Request Queue depth supported by controller
* @nutmrs: Task Management Queue depth supported by controller
* @reserved_slot: Used to submit device commands. Protected by @dev_cmd.lock.
@@ -830,6 +831,7 @@ struct ufs_hba_monitor {
* device
* @complete_put: whether or not to call ufshcd_rpm_put() from inside
* ufshcd_resume_complete()
+ * @ext_iid_sup: is EXT_IID is supported by UFSHC
*/
struct ufs_hba {
void __iomem *mmio_base;
@@ -871,6 +873,7 @@ struct ufs_hba {

u32 capabilities;
int nutrs;
+ u32 mcq_capabilities;
int nutmrs;
u32 reserved_slot;
u32 ufs_version;
@@ -978,6 +981,7 @@ struct ufs_hba {
#endif
u32 luns_avail;
bool complete_put;
+ bool ext_iid_sup;
};

/* Returns true if clocks can be gated. Otherwise false */
diff --git a/include/ufs/ufshci.h b/include/ufs/ufshci.h
index f525566..4d4da06 100644
--- a/include/ufs/ufshci.h
+++ b/include/ufs/ufshci.h
@@ -22,6 +22,7 @@ enum {
/* UFSHCI Registers */
enum {
REG_CONTROLLER_CAPABILITIES = 0x00,
+ REG_MCQCAP = 0x04,
REG_UFS_VERSION = 0x08,
REG_CONTROLLER_DEV_ID = 0x10,
REG_CONTROLLER_PROD_ID = 0x14,
@@ -68,6 +69,12 @@ enum {
MASK_OUT_OF_ORDER_DATA_DELIVERY_SUPPORT = 0x02000000,
MASK_UIC_DME_TEST_MODE_SUPPORT = 0x04000000,
MASK_CRYPTO_SUPPORT = 0x10000000,
+ MASK_MCQ_SUPPORT = 0x40000000,
+};
+
+/* MCQ capability mask */
+enum {
+ MASK_EXT_IID_SUPPORT = 0x00000400,
};

#define UFS_MASK(mask, offset) ((mask) << (offset))
--
2.7.4