crypto: ccp - Move some PSP mailbox bit definitions into common header

Some of the bits and fields used for mailboxes communicating with the
PSP are common across all mailbox implementations (SEV, TEE, etc).

Move these bits into the common `linux/psp.h` so they don't need to
be re-defined for each implementation.
Acked-by: Rijo Thomas <Rijo-john.Thomas@amd.com>
Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/ccp/psp-dev.h

@@ -17,9 +17,6 @@
 
 #include "sp-dev.h"
 
-#define PSP_CMDRESP_RESP		BIT(31)
-#define PSP_CMDRESP_ERR_MASK		0xffff
-
 #define MAX_PSP_NAME_LEN		16
 
 extern struct psp_device *psp_master;

drivers/crypto/ccp/sev-dev.c

@@ -7,6 +7,7 @@
  * Author: Brijesh Singh <brijesh.singh@amd.com>
  */
 
+#include <linux/bitfield.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/kthread.h>
@@ -103,7 +104,7 @@ static void sev_irq_handler(int irq, void *data, unsigned int status)
 
 	/* Check if it is SEV command completion: */
 	reg = ioread32(sev->io_regs + sev->vdata->cmdresp_reg);
-	if (reg & PSP_CMDRESP_RESP) {
+	if (FIELD_GET(PSP_CMDRESP_RESP, reg)) {
 		sev->int_rcvd = 1;
 		wake_up(&sev->int_queue);
 	}
@@ -347,9 +348,7 @@ static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret)
 
 	sev->int_rcvd = 0;
 
-	reg = cmd;
-	reg <<= SEV_CMDRESP_CMD_SHIFT;
-	reg |= SEV_CMDRESP_IOC;
+	reg = FIELD_PREP(SEV_CMDRESP_CMD, cmd) | SEV_CMDRESP_IOC;
 	iowrite32(reg, sev->io_regs + sev->vdata->cmdresp_reg);
 
 	/* wait for command completion */
@@ -367,11 +366,11 @@ static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret)
 	psp_timeout = psp_cmd_timeout;
 
 	if (psp_ret)
-		*psp_ret = reg & PSP_CMDRESP_ERR_MASK;
+		*psp_ret = FIELD_GET(PSP_CMDRESP_STS, reg);
 
-	if (reg & PSP_CMDRESP_ERR_MASK) {
-		dev_dbg(sev->dev, "sev command %#x failed (%#010x)\n",
-			cmd, reg & PSP_CMDRESP_ERR_MASK);
+	if (FIELD_GET(PSP_CMDRESP_STS, reg)) {
+		dev_dbg(sev->dev, "sev command %#x failed (%#010lx)\n",
+			cmd, FIELD_GET(PSP_CMDRESP_STS, reg));
 		ret = -EIO;
 	} else {
 		ret = sev_write_init_ex_file_if_required(cmd);

drivers/crypto/ccp/sev-dev.h

@@ -25,8 +25,8 @@
 #include <linux/miscdevice.h>
 #include <linux/capability.h>
 
+#define SEV_CMDRESP_CMD			GENMASK(26, 16)
 #define SEV_CMD_COMPLETE		BIT(1)
-#define SEV_CMDRESP_CMD_SHIFT		16
 #define SEV_CMDRESP_IOC			BIT(0)
 
 struct sev_misc_dev {

drivers/crypto/ccp/tee-dev.c

@@ -8,6 +8,7 @@
  * Copyright (C) 2019,2021 Advanced Micro Devices, Inc.
  */
 
+#include <linux/bitfield.h>
 #include <linux/types.h>
 #include <linux/mutex.h>
 #include <linux/delay.h>
@@ -69,7 +70,7 @@ static int tee_wait_cmd_poll(struct psp_tee_device *tee, unsigned int timeout,
 
 	while (--nloop) {
 		*reg = ioread32(tee->io_regs + tee->vdata->cmdresp_reg);
-		if (*reg & PSP_CMDRESP_RESP)
+		if (FIELD_GET(PSP_CMDRESP_RESP, *reg))
 			return 0;
 
 		usleep_range(10000, 10100);
@@ -149,9 +150,9 @@ static int tee_init_ring(struct psp_tee_device *tee)
 		goto free_buf;
 	}
 
-	if (reg & PSP_CMDRESP_ERR_MASK) {
-		dev_err(tee->dev, "tee: ring init command failed (%#010x)\n",
-			reg & PSP_CMDRESP_ERR_MASK);
+	if (FIELD_GET(PSP_CMDRESP_STS, reg)) {
+		dev_err(tee->dev, "tee: ring init command failed (%#010lx)\n",
+			FIELD_GET(PSP_CMDRESP_STS, reg));
 		tee_free_ring(tee);
 		ret = -EIO;
 	}
@@ -179,9 +180,9 @@ static void tee_destroy_ring(struct psp_tee_device *tee)
 	ret = tee_wait_cmd_poll(tee, TEE_DEFAULT_TIMEOUT, &reg);
 	if (ret) {
 		dev_err(tee->dev, "tee: ring destroy command timed out\n");
-	} else if (reg & PSP_CMDRESP_ERR_MASK) {
-		dev_err(tee->dev, "tee: ring destroy command failed (%#010x)\n",
-			reg & PSP_CMDRESP_ERR_MASK);
+	} else if (FIELD_GET(PSP_CMDRESP_STS, reg)) {
+		dev_err(tee->dev, "tee: ring destroy command failed (%#010lx)\n",
+			FIELD_GET(PSP_CMDRESP_STS, reg));
 	}
 
 free_ring:

drivers/i2c/busses/i2c-designware-amdpsp.c

@@ -25,12 +25,6 @@
 #define PSP_I2C_REQ_STS_BUS_BUSY	0x1
 #define PSP_I2C_REQ_STS_INV_PARAM	0x3
 
-#define PSP_MBOX_FIELDS_STS		GENMASK(15, 0)
-#define PSP_MBOX_FIELDS_CMD		GENMASK(23, 16)
-#define PSP_MBOX_FIELDS_RESERVED	GENMASK(29, 24)
-#define PSP_MBOX_FIELDS_RECOVERY	BIT(30)
-#define PSP_MBOX_FIELDS_READY		BIT(31)
-
 struct psp_req_buffer_hdr {
 	u32 total_size;
 	u32 status;
@@ -99,15 +93,15 @@ static int psp_check_mbox_recovery(struct psp_mbox __iomem *mbox)
 
 	tmp = readl(&mbox->cmd_fields);
 
-	return FIELD_GET(PSP_MBOX_FIELDS_RECOVERY, tmp);
+	return FIELD_GET(PSP_CMDRESP_RECOVERY, tmp);
 }
 
 static int psp_wait_cmd(struct psp_mbox __iomem *mbox)
 {
 	u32 tmp, expected;
 
-	/* Expect mbox_cmd to be cleared and ready bit to be set by PSP */
-	expected = FIELD_PREP(PSP_MBOX_FIELDS_READY, 1);
+	/* Expect mbox_cmd to be cleared and the response bit to be set by PSP */
+	expected = FIELD_PREP(PSP_CMDRESP_RESP, 1);
 
 	/*
 	 * Check for readiness of PSP mailbox in a tight loop in order to
@@ -124,7 +118,7 @@ static u32 psp_check_mbox_sts(struct psp_mbox __iomem *mbox)
 
 	cmd_reg = readl(&mbox->cmd_fields);
 
-	return FIELD_GET(PSP_MBOX_FIELDS_STS, cmd_reg);
+	return FIELD_GET(PSP_CMDRESP_STS, cmd_reg);
 }
 
 static int psp_send_cmd(struct psp_i2c_req *req)
@@ -148,7 +142,7 @@ static int psp_send_cmd(struct psp_i2c_req *req)
 	writeq(req_addr, &mbox->i2c_req_addr);
 
 	/* Write command register to trigger processing */
-	cmd_reg = FIELD_PREP(PSP_MBOX_FIELDS_CMD, PSP_I2C_REQ_BUS_CMD);
+	cmd_reg = FIELD_PREP(PSP_CMDRESP_CMD, PSP_I2C_REQ_BUS_CMD);
 	writel(cmd_reg, &mbox->cmd_fields);
 
 	if (psp_wait_cmd(mbox))

include/linux/psp.h

@@ -11,4 +11,16 @@
 #define __psp_pa(x)	__pa(x)
 #endif
 
+/*
+ * Fields and bits used by most PSP mailboxes
+ *
+ * Note: Some mailboxes (such as SEV) have extra bits or different meanings
+ * and should include an appropriate local definition in their source file.
+ */
+#define PSP_CMDRESP_STS		GENMASK(15, 0)
+#define PSP_CMDRESP_CMD		GENMASK(23, 16)
+#define PSP_CMDRESP_RESERVED	GENMASK(29, 24)
+#define PSP_CMDRESP_RECOVERY	BIT(30)
+#define PSP_CMDRESP_RESP	BIT(31)
+
 #endif /* __PSP_H */