lib: sbi: Use sbi_hartmask in sbi_hsm_hart_interruptible_mask()

This removes several hartid/hartindex conversions, as well as two loops
through the mask for broadcast IPIs.

Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>

include/sbi/sbi_domain.h

@@ -226,14 +226,13 @@ extern struct sbi_dlist domain_list;
 bool sbi_domain_is_assigned_hart(const struct sbi_domain *dom, u32 hartid);
 
 /**
- * Get ulong assigned HART mask for given domain and HART base ID
+ * Get the assigned HART mask for given domain
  * @param dom pointer to domain
- * @param hbase the HART base ID
- * @return ulong possible HART mask
- * Note: the return ulong mask will be set to zero on failure.
+ * @param mask the output hartmask to fill
+ * @return 0 on success and SBI_Exxx (< 0) on failure
  */
-ulong sbi_domain_get_assigned_hartmask(const struct sbi_domain *dom,
-				       ulong hbase);
+int sbi_domain_get_assigned_hartmask(const struct sbi_domain *dom,
+				     struct sbi_hartmask *mask);
 
 /**
  * Initialize a domain memory region based on it's physical

include/sbi/sbi_hartmask.h

@@ -127,6 +127,18 @@ static inline void sbi_hartmask_clear_all(struct sbi_hartmask *dstp)
 	bitmap_zero(sbi_hartmask_bits(dstp), SBI_HARTMASK_MAX_BITS);
 }
 
+/**
+ * *dstp = *srcp
+ * @param dstp the hartmask destination
+ * @param srcp the hartmask source
+ */
+static inline void sbi_hartmask_copy(struct sbi_hartmask *dstp,
+				     const struct sbi_hartmask *srcp)
+{
+	bitmap_copy(sbi_hartmask_bits(dstp), sbi_hartmask_bits(srcp),
+		    SBI_HARTMASK_MAX_BITS);
+}
+
 /**
  * *dstp = *src1p & *src2p
  * @param dstp the hartmask result

include/sbi/sbi_hsm.h

@@ -10,6 +10,7 @@
 #ifndef __SBI_HSM_H__
 #define __SBI_HSM_H__
 
+#include <sbi/sbi_hartmask.h>
 #include <sbi/sbi_types.h>
 
 /** Hart state managment device */
@@ -75,7 +76,7 @@ bool sbi_hsm_hart_change_state(struct sbi_scratch *scratch, long oldstate,
 int __sbi_hsm_hart_get_state(u32 hartindex);
 int sbi_hsm_hart_get_state(const struct sbi_domain *dom, u32 hartid);
 int sbi_hsm_hart_interruptible_mask(const struct sbi_domain *dom,
-				    ulong hbase, ulong *out_hmask);
+				    struct sbi_hartmask *mask);
 void __sbi_hsm_suspend_non_ret_save(struct sbi_scratch *scratch);
 void __noreturn sbi_hsm_hart_start_finish(struct sbi_scratch *scratch,
 					  u32 hartid);

lib/sbi/sbi_domain.c

@@ -75,20 +75,19 @@ bool sbi_domain_is_assigned_hart(const struct sbi_domain *dom, u32 hartid)
 	return ret;
 }
 
-ulong sbi_domain_get_assigned_hartmask(const struct sbi_domain *dom,
-				       ulong hbase)
+int sbi_domain_get_assigned_hartmask(const struct sbi_domain *dom,
+				     struct sbi_hartmask *mask)
 {
 	ulong ret = 0;
 	struct sbi_domain *tdom = (struct sbi_domain *)dom;
 
-	if (!dom)
+	if (!dom) {
+		sbi_hartmask_clear_all(mask);
 		return 0;
+	}
 
 	spin_lock(&tdom->assigned_harts_lock);
-	for (int i = 0; i < 8 * sizeof(ret); i++) {
-		if (sbi_hartmask_test_hartid(hbase + i, &tdom->assigned_harts))
-			ret |= 1UL << i;
-	}
+	sbi_hartmask_copy(mask, &tdom->assigned_harts);
 	spin_unlock(&tdom->assigned_harts_lock);
 
 	return ret;

lib/sbi/sbi_hsm.c

@@ -110,36 +110,27 @@ static void hsm_start_ticket_release(struct sbi_hsm_data *hdata)
 }
 
 /**
- * Get ulong HART mask for given HART base ID
+ * Get the mask of harts which are valid IPI targets
  * @param dom the domain to be used for output HART mask
- * @param hbase the HART base ID
- * @param out_hmask the output ulong HART mask
+ * @param mask the output hartmask to fill
  * @return 0 on success and SBI_Exxx (< 0) on failure
- * Note: the output HART mask will be set to zero on failure as well.
  */
 int sbi_hsm_hart_interruptible_mask(const struct sbi_domain *dom,
-				    ulong hbase, ulong *out_hmask)
+				    struct sbi_hartmask *mask)
 {
-	int hstate;
-	ulong i, hmask, dmask;
-	u32 hartindex;
+	int hstate, ret;
+	u32 i;
 
-	*out_hmask = 0;
-	if (!sbi_hartid_valid(hbase))
-		return SBI_EINVAL;
+	ret = sbi_domain_get_assigned_hartmask(dom, mask);
+	if (ret)
+		return ret;
 
-	dmask = sbi_domain_get_assigned_hartmask(dom, hbase);
-	for (i = 0; i < BITS_PER_LONG; i++) {
-		hmask = 1UL << i;
-		if (!(dmask & hmask))
-			continue;
-
-		hartindex = sbi_hartid_to_hartindex(hbase + i);
-		hstate = __sbi_hsm_hart_get_state(hartindex);
-		if (hstate == SBI_HSM_STATE_STARTED ||
-		    hstate == SBI_HSM_STATE_SUSPENDED ||
-		    hstate == SBI_HSM_STATE_RESUME_PENDING)
-			*out_hmask |= hmask;
+	sbi_hartmask_for_each_hartindex(i, mask) {
+		hstate = __sbi_hsm_hart_get_state(i);
+		if (hstate != SBI_HSM_STATE_STARTED &&
+		    hstate != SBI_HSM_STATE_SUSPENDED &&
+		    hstate != SBI_HSM_STATE_RESUME_PENDING)
+			sbi_hartmask_clear_hartindex(i, mask);
 	}
 
 	return 0;

lib/sbi/sbi_ipi.c

@@ -111,31 +111,25 @@ int sbi_ipi_send_many(ulong hmask, ulong hbase, u32 event, void *data)
 {
 	int rc = 0;
 	bool retry_needed;
-	ulong i, m;
-	struct sbi_hartmask target_mask = {0};
+	ulong i;
+	struct sbi_hartmask target_mask;
 	struct sbi_domain *dom = sbi_domain_thishart_ptr();
 	struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
 
 	/* Find the target harts */
-	if (hbase != -1UL) {
-		rc = sbi_hsm_hart_interruptible_mask(dom, hbase, &m);
-		if (rc)
-			return rc;
-		m &= hmask;
+	rc = sbi_hsm_hart_interruptible_mask(dom, &target_mask);
+	if (rc)
+		return rc;
 
-		for (i = hbase; m; i++, m >>= 1) {
-			if (m & 1UL)
-				sbi_hartmask_set_hartid(i, &target_mask);
-		}
-	} else {
-		hbase = 0;
-		while (!sbi_hsm_hart_interruptible_mask(dom, hbase, &m)) {
-			for (i = hbase; m; i++, m >>= 1) {
-				if (m & 1UL)
-					sbi_hartmask_set_hartid(i, &target_mask);
-			}
-			hbase += BITS_PER_LONG;
+	if (hbase != -1UL) {
+		struct sbi_hartmask tmp_mask = { 0 };
+
+		for (i = hbase; hmask; i++, hmask >>= 1) {
+			if (hmask & 1UL)
+				sbi_hartmask_set_hartid(i, &tmp_mask);
 		}
+
+		sbi_hartmask_and(&target_mask, &target_mask, &tmp_mask);
 	}
 
 	/* Send IPIs */