drm/xe/oa: Changes to OA_TAKEN

Rename OA_TAKEN to xe_oa_circ_diff, since xe_oa_circ_diff better describes
what the macro actually does. Also convert to function and add xe_oa_stream
arg. These will be used in the following patch.
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240618014609.3233427-17-ashutosh.dixit@intel.com

drivers/gpu/drm/xe/xe_oa.c

@@ -36,7 +36,6 @@
 #include "xe_pm.h"
 #include "xe_sched_job.h"
 
-#define OA_TAKEN(tail, head)	(((tail) - (head)) & (XE_OA_BUFFER_SIZE - 1))
 #define DEFAULT_POLL_FREQUENCY_HZ 200
 #define DEFAULT_POLL_PERIOD_NS (NSEC_PER_SEC / DEFAULT_POLL_FREQUENCY_HZ)
 #define XE_OA_UNIT_INVALID U32_MAX
@@ -113,6 +112,11 @@ static const struct xe_oa_format oa_formats[] = {
 	[XE_OA_FORMAT_PEC36u64_G1_4_G2_32]	= { 4, 320, DRM_FMT(PEC), HDR_64_BIT, 1, 0 },
 };
 
+static u32 xe_oa_circ_diff(struct xe_oa_stream *stream, u32 tail, u32 head)
+{
+	return (tail - head) & (XE_OA_BUFFER_SIZE - 1);
+}
+
 static void xe_oa_config_release(struct kref *ref)
 {
 	struct xe_oa_config *oa_config =
@@ -217,11 +221,11 @@ static bool xe_oa_buffer_check_unlocked(struct xe_oa_stream *stream)
 	 * increments. Also report size may not be a power of 2. Compute potential
 	 * partially landed report in OA buffer.
 	 */
-	partial_report_size = OA_TAKEN(hw_tail, stream->oa_buffer.tail);
+	partial_report_size = xe_oa_circ_diff(stream, hw_tail, stream->oa_buffer.tail);
 	partial_report_size %= report_size;
 
 	/* Subtract partial amount off the tail */
-	hw_tail = OA_TAKEN(hw_tail, partial_report_size);
+	hw_tail = xe_oa_circ_diff(stream, hw_tail, partial_report_size);
 
 	tail = hw_tail;
 
@@ -233,24 +237,24 @@ static bool xe_oa_buffer_check_unlocked(struct xe_oa_stream *stream)
 	 * This is assuming that the writes of the OA unit land in memory in the order
 	 * they were written.  If not : (╯°□°）╯︵ ┻━┻
 	 */
-	while (OA_TAKEN(tail, stream->oa_buffer.tail) >= report_size) {
+	while (xe_oa_circ_diff(stream, tail, stream->oa_buffer.tail) >= report_size) {
 		void *report = stream->oa_buffer.vaddr + tail;
 
 		if (oa_report_id(stream, report) || oa_timestamp(stream, report))
 			break;
 
-		tail = OA_TAKEN(tail, report_size);
+		tail = xe_oa_circ_diff(stream, tail, report_size);
 	}
 
-	if (OA_TAKEN(hw_tail, tail) > report_size)
+	if (xe_oa_circ_diff(stream, hw_tail, tail) > report_size)
 		drm_dbg(&stream->oa->xe->drm,
 			"unlanded report(s) head=0x%x tail=0x%x hw_tail=0x%x\n",
 			stream->oa_buffer.head, tail, hw_tail);
 
 	stream->oa_buffer.tail = tail;
 
-	pollin = OA_TAKEN(stream->oa_buffer.tail,
-			  stream->oa_buffer.head) >= report_size;
+	pollin = xe_oa_circ_diff(stream, stream->oa_buffer.tail,
+				 stream->oa_buffer.head) >= report_size;
 
 	spin_unlock_irqrestore(&stream->oa_buffer.ptr_lock, flags);
 
@@ -323,7 +327,7 @@ static int xe_oa_append_reports(struct xe_oa_stream *stream, char __user *buf,
 
 	xe_assert(stream->oa->xe, head < XE_OA_BUFFER_SIZE && tail < XE_OA_BUFFER_SIZE);
 
-	for (; OA_TAKEN(tail, head); head = (head + report_size) & mask) {
+	for (; xe_oa_circ_diff(stream, tail, head); head = (head + report_size) & mask) {
 		u8 *report = oa_buf_base + head;
 
 		ret = xe_oa_append_report(stream, buf, count, offset, report);