[PATCH 1/4] qxl: drop mode_info.modes & related code.

[PATCH 1/4] qxl: drop mode_info.modes & related code.

[Gerd Hoffmann]

very old qxl hardware revisions (predating qxl ksm support by a few
years) supported a fixed list of video modes only.  The list is still
provided by the virtual hardware, for backward compatibility reasons.

The qxl kms driver never ever looks at it, except for dumping it to
the kernel log at load time in case debug logging is enabled.  Drop
that pointless code.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 drivers/gpu/drm/qxl/qxl_drv.h |  2 --
 drivers/gpu/drm/qxl/qxl_kms.c | 22 ----------------------
 2 files changed, 24 deletions(-)

diff --git a/drivers/gpu/drm/qxl/qxl_drv.h b/drivers/gpu/drm/qxl/qxl_drv.h
index 0c313e5..fe90b36 100644
--- a/drivers/gpu/drm/qxl/qxl_drv.h
+++ b/drivers/gpu/drm/qxl/qxl_drv.h
@@ -160,8 +160,6 @@ struct qxl_mman {
 };
 
 struct qxl_mode_info {
-	int num_modes;
-	struct qxl_mode *modes;
 	bool mode_config_initialized;
 
 	/* pointer to fbdev info structure */
diff --git a/drivers/gpu/drm/qxl/qxl_kms.c b/drivers/gpu/drm/qxl/qxl_kms.c
index 2b1e1f3..a9a741c 100644
--- a/drivers/gpu/drm/qxl/qxl_kms.c
+++ b/drivers/gpu/drm/qxl/qxl_kms.c
@@ -31,19 +31,9 @@
 
 int qxl_log_level;
 
-static void qxl_dump_mode(struct qxl_device *qdev, void *p)
-{
-	struct qxl_mode *m = p;
-	DRM_DEBUG_KMS("%d: %dx%d %d bits, stride %d, %dmm x %dmm, orientation %d\n",
-		      m->id, m->x_res, m->y_res, m->bits, m->stride, m->x_mili,
-		      m->y_mili, m->orientation);
-}
-
 static bool qxl_check_device(struct qxl_device *qdev)
 {
 	struct qxl_rom *rom = qdev->rom;
-	int mode_offset;
-	int i;
 
 	if (rom->magic != 0x4f525851) {
 		DRM_ERROR("bad rom signature %x\n", rom->magic);
@@ -53,8 +43,6 @@ static bool qxl_check_device(struct qxl_device *qdev)
 	DRM_INFO("Device Version %d.%d\n", rom->id, rom->update_id);
 	DRM_INFO("Compression level %d log level %d\n", rom->compression_level,
 		 rom->log_level);
-	DRM_INFO("Currently using mode #%d, list at 0x%x\n",
-		 rom->mode, rom->modes_offset);
 	DRM_INFO("%d io pages at offset 0x%x\n",
 		 rom->num_io_pages, rom->pages_offset);
 	DRM_INFO("%d byte draw area at offset 0x%x\n",
@@ -62,14 +50,6 @@ static bool qxl_check_device(struct qxl_device *qdev)
 
 	qdev->vram_size = rom->surface0_area_size;
 	DRM_INFO("RAM header offset: 0x%x\n", rom->ram_header_offset);
-
-	mode_offset = rom->modes_offset / 4;
-	qdev->mode_info.num_modes = ((u32 *)rom)[mode_offset];
-	DRM_INFO("rom modes offset 0x%x for %d modes\n", rom->modes_offset,
-		 qdev->mode_info.num_modes);
-	qdev->mode_info.modes = (void *)((uint32_t *)rom + mode_offset + 1);
-	for (i = 0; i < qdev->mode_info.num_modes; i++)
-		qxl_dump_mode(qdev, qdev->mode_info.modes + i);
 	return true;
 }
 
@@ -282,7 +262,5 @@ void qxl_device_fini(struct qxl_device *qdev)
 	iounmap(qdev->ram_header);
 	iounmap(qdev->rom);
 	qdev->rom = NULL;
-	qdev->mode_info.modes = NULL;
-	qdev->mode_info.num_modes = 0;
 	qxl_debugfs_remove_files(qdev);
 }
-- 
1.8.3.1

[PATCH 2/4] qxl: limit monitor config read retries

[Gerd Hoffmann]

When reading the monitor config fails, don't retry forever.  If it fails
ten times in a row just give up to avoid the driver hangs.  Also add a
small delay after each attempt, so the host has a chance to complete a
partial update.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 drivers/gpu/drm/qxl/qxl_display.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c
index 2cd14be..2b99496 100644
--- a/drivers/gpu/drm/qxl/qxl_display.c
+++ b/drivers/gpu/drm/qxl/qxl_display.c
@@ -157,19 +157,23 @@ static void qxl_update_offset_props(struct qxl_device *qdev)
 
 void qxl_display_read_client_monitors_config(struct qxl_device *qdev)
 {
-
 	struct drm_device *dev = &qdev->ddev;
-	int status;
+	int status, retries;
 
-	status = qxl_display_copy_rom_client_monitors_config(qdev);
-	while (status == MONITORS_CONFIG_BAD_CRC) {
-		qxl_io_log(qdev, "failed crc check for client_monitors_config,"
-				 " retrying\n");
+	for (retries = 0; retries < 10; retries++) {
 		status = qxl_display_copy_rom_client_monitors_config(qdev);
+		if (status != MONITORS_CONFIG_BAD_CRC)
+			break;
+		udelay(5);
+	}
+	if (status == MONITORS_CONFIG_BAD_CRC) {
+		qxl_io_log(qdev, "config: bad crc\n");
+		DRM_DEBUG_KMS("ignoring client monitors config: bad crc");
+		return;
 	}
 	if (status == MONITORS_CONFIG_UNCHANGED) {
-		qxl_io_log(qdev, "config unchanged\n");
-		DRM_DEBUG("ignoring unchanged client monitors config");
+		qxl_io_log(qdev, "config: unchanged\n");
+		DRM_DEBUG_KMS("ignoring client monitors config: unchanged");
 		return;
 	}
 
-- 
1.8.3.1

[PATCH 3/4] qxl: read monitors config at boot

[Gerd Hoffmann]

Try to read the client monitors config at driver load time, even without
explicit notification.  So in case that info was filled before the driver
loaded and we've missed the notifications because of that the settings
will still be used.

With that place we now have to take care to properly handle a empty client
monitors config, so we don't trip over an uninitialized client monitors
config.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 drivers/gpu/drm/qxl/qxl_display.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c
index 2b99496..cf99ace 100644
--- a/drivers/gpu/drm/qxl/qxl_display.c
+++ b/drivers/gpu/drm/qxl/qxl_display.c
@@ -81,6 +81,10 @@ static int qxl_display_copy_rom_client_monitors_config(struct qxl_device *qdev)
 			   qdev->rom->client_monitors_config_crc);
 		return MONITORS_CONFIG_BAD_CRC;
 	}
+	if (!num_monitors) {
+		DRM_DEBUG_KMS("no client monitors configured\n");
+		return status;
+	}
 	if (num_monitors > qdev->monitors_config->max_allowed) {
 		DRM_DEBUG_KMS("client monitors list will be truncated: %d < %d\n",
 			      qdev->monitors_config->max_allowed, num_monitors);
@@ -1192,6 +1196,7 @@ int qxl_modeset_init(struct qxl_device *qdev)
 		qdev_output_init(&qdev->ddev, i);
 	}
 
+	qxl_display_read_client_monitors_config(qdev);
 	qdev->mode_info.mode_config_initialized = true;
 
 	drm_mode_config_reset(&qdev->ddev);
-- 
1.8.3.1

[PATCH 4/4] qxl: fix qxl_conn_get_modes

[Gerd Hoffmann]

Call qxl_add_monitors_config_modes() unconditionally.  Do all sanity
checks in that function.

Fix sanity checks.  monitors_config is the current monitor
configuration, whereas client_monitors_config is the configuration
requested by the spice client.  So when filling the mode list, based on
the spice client request, we need to look at
client_monitors_config->count not monitors_config->count.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 drivers/gpu/drm/qxl/qxl_display.c | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c
index cf99ace..9548bb5 100644
--- a/drivers/gpu/drm/qxl/qxl_display.c
+++ b/drivers/gpu/drm/qxl/qxl_display.c
@@ -202,9 +202,17 @@ static int qxl_add_monitors_config_modes(struct drm_connector *connector,
 	struct drm_display_mode *mode = NULL;
 	struct qxl_head *head;
 
+	if (!qdev->monitors_config)
+		return 0;
+	if (h >= qdev->monitors_config->max_allowed)
+		return 0;
 	if (!qdev->client_monitors_config)
 		return 0;
+	if (h >= qdev->client_monitors_config->count)
+		return 0;
+
 	head = &qdev->client_monitors_config->heads[h];
+	DRM_DEBUG_KMS("head %d is %dx%d\n", h, head->width, head->height);
 
 	mode = drm_cvt_mode(dev, head->width, head->height, 60, false, false,
 			    false);
@@ -911,19 +919,13 @@ static void qxl_enc_mode_set(struct drm_encoder *encoder,
 
 static int qxl_conn_get_modes(struct drm_connector *connector)
 {
-	int ret = 0;
-	struct qxl_device *qdev = connector->dev->dev_private;
 	unsigned pwidth = 1024;
 	unsigned pheight = 768;
+	int ret = 0;
 
-	DRM_DEBUG_KMS("monitors_config=%p\n", qdev->monitors_config);
-	/* TODO: what should we do here? only show the configured modes for the
-	 * device, or allow the full list, or both? */
-	if (qdev->monitors_config && qdev->monitors_config->count) {
-		ret = qxl_add_monitors_config_modes(connector, &pwidth, &pheight);
-		if (ret < 0)
-			return ret;
-	}
+	ret = qxl_add_monitors_config_modes(connector, &pwidth, &pheight);
+	if (ret < 0)
+		return ret;
 	ret += qxl_add_common_modes(connector, pwidth, pheight);
 	return ret;
 }
-- 
1.8.3.1

[PATCH 1/4] qxl: drop mode_info.modes & related code.

[Gerd Hoffmann]

very old qxl hardware revisions (predating qxl ksm support by a few
years) supported a fixed list of video modes only.  The list is still
provided by the virtual hardware, for backward compatibility reasons.

The qxl kms driver never ever looks at it, except for dumping it to
the kernel log at load time in case debug logging is enabled.  Drop
that pointless code.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 drivers/gpu/drm/qxl/qxl_drv.h |  2 --
 drivers/gpu/drm/qxl/qxl_kms.c | 22 ----------------------
 2 files changed, 24 deletions(-)

diff --git a/drivers/gpu/drm/qxl/qxl_drv.h b/drivers/gpu/drm/qxl/qxl_drv.h
index 0c313e5..fe90b36 100644
--- a/drivers/gpu/drm/qxl/qxl_drv.h
+++ b/drivers/gpu/drm/qxl/qxl_drv.h
@@ -160,8 +160,6 @@ struct qxl_mman {
 };
 
 struct qxl_mode_info {
-	int num_modes;
-	struct qxl_mode *modes;
 	bool mode_config_initialized;
 
 	/* pointer to fbdev info structure */
diff --git a/drivers/gpu/drm/qxl/qxl_kms.c b/drivers/gpu/drm/qxl/qxl_kms.c
index 2b1e1f3..a9a741c 100644
--- a/drivers/gpu/drm/qxl/qxl_kms.c
+++ b/drivers/gpu/drm/qxl/qxl_kms.c
@@ -31,19 +31,9 @@
 
 int qxl_log_level;
 
-static void qxl_dump_mode(struct qxl_device *qdev, void *p)
-{
-	struct qxl_mode *m = p;
-	DRM_DEBUG_KMS("%d: %dx%d %d bits, stride %d, %dmm x %dmm, orientation %d\n",
-		      m->id, m->x_res, m->y_res, m->bits, m->stride, m->x_mili,
-		      m->y_mili, m->orientation);
-}
-
 static bool qxl_check_device(struct qxl_device *qdev)
 {
 	struct qxl_rom *rom = qdev->rom;
-	int mode_offset;
-	int i;
 
 	if (rom->magic != 0x4f525851) {
 		DRM_ERROR("bad rom signature %x\n", rom->magic);
@@ -53,8 +43,6 @@ static bool qxl_check_device(struct qxl_device *qdev)
 	DRM_INFO("Device Version %d.%d\n", rom->id, rom->update_id);
 	DRM_INFO("Compression level %d log level %d\n", rom->compression_level,
 		 rom->log_level);
-	DRM_INFO("Currently using mode #%d, list at 0x%x\n",
-		 rom->mode, rom->modes_offset);
 	DRM_INFO("%d io pages at offset 0x%x\n",
 		 rom->num_io_pages, rom->pages_offset);
 	DRM_INFO("%d byte draw area at offset 0x%x\n",
@@ -62,14 +50,6 @@ static bool qxl_check_device(struct qxl_device *qdev)
 
 	qdev->vram_size = rom->surface0_area_size;
 	DRM_INFO("RAM header offset: 0x%x\n", rom->ram_header_offset);
-
-	mode_offset = rom->modes_offset / 4;
-	qdev->mode_info.num_modes = ((u32 *)rom)[mode_offset];
-	DRM_INFO("rom modes offset 0x%x for %d modes\n", rom->modes_offset,
-		 qdev->mode_info.num_modes);
-	qdev->mode_info.modes = (void *)((uint32_t *)rom + mode_offset + 1);
-	for (i = 0; i < qdev->mode_info.num_modes; i++)
-		qxl_dump_mode(qdev, qdev->mode_info.modes + i);
 	return true;
 }
 
@@ -282,7 +262,5 @@ void qxl_device_fini(struct qxl_device *qdev)
 	iounmap(qdev->ram_header);
 	iounmap(qdev->rom);
 	qdev->rom = NULL;
-	qdev->mode_info.modes = NULL;
-	qdev->mode_info.num_modes = 0;
 	qxl_debugfs_remove_files(qdev);
 }
-- 
1.8.3.1