Subject: [v4 02/11] soc/fsl/qbman: Use shared-dma-pool for QMan private memory allocations

From: [email-masked] (Roy Pledge)
Date: Thu, 24 Aug 2017 16:37:46 -0400

Use the shared-memory-pool mechanism for frame queue descriptor and
packed frame descriptor record area allocations.

Signed-off-by: Roy Pledge <[email-masked]>
---
 drivers/soc/fsl/qbman/qman_ccsr.c | 138 +++++++++++++++++++++++++++++---------
 drivers/soc/fsl/qbman/qman_priv.h |   4 +-
 drivers/soc/fsl/qbman/qman_test.h |   2 -
 3 files changed, 109 insertions(+), 35 deletions(-)

diff --git a/drivers/soc/fsl/qbman/qman_ccsr.c b/drivers/soc/fsl/qbman/qman_ccsr.c
index 835ce94..20a1ebd 100644
--- a/drivers/soc/fsl/qbman/qman_ccsr.c
+++ b/drivers/soc/fsl/qbman/qman_ccsr.c
@@ -401,21 +401,42 @@ static int qm_init_pfdr(struct device *dev, u32 pfdr_start, u32 num)
 }
 
 /*
- * Ideally we would use the DMA API to turn rmem->base into a DMA address
- * (especially if iommu translations ever get involved).  Unfortunately, the
- * DMA API currently does not allow mapping anything that is not backed with
- * a struct page.
+ * QMan needs two global memory areas initialized at boot time:
+ *  1) FQD: Frame Queue Descriptors used to manage frame queues
+ *  2) PFDR: Packed Frame Queue Descriptor Records used to store frames
+ * Both areas are reserved using the device tree reserved memory framework
+ * and the addresses and sizes are initialized when the QMan device is probed
  */
 static dma_addr_t fqd_a, pfdr_a;
 static size_t fqd_sz, pfdr_sz;
 
+#ifdef CONFIG_PPC
+/*
+ * Support for PPC Device Tree backward compatibility when compatible
+ * string is set to fsl-qman-fqd and fsl-qman-pfdr
+ */
+static int zero_priv_mem(phys_addr_t addr, size_t sz)
+{
+	/* map as cacheable, non-guarded */
+	void __iomem *tmpp = ioremap_prot(addr, sz, 0);
+
+	if (!tmpp)
+		return -ENOMEM;
+
+	memset_io(tmpp, 0, sz);
+	flush_dcache_range((unsigned long)tmpp,
+			   (unsigned long)tmpp + sz);
+	iounmap(tmpp);
+
+	return 0;
+}
+
 static int qman_fqd(struct reserved_mem *rmem)
 {
 	fqd_a = rmem->base;
 	fqd_sz = rmem->size;
 
 	WARN_ON(!(fqd_a && fqd_sz));
-
 	return 0;
 }
 RESERVEDMEM_OF_DECLARE(qman_fqd, "fsl,qman-fqd", qman_fqd);
@@ -431,32 +452,13 @@ static int qman_pfdr(struct reserved_mem *rmem)
 }
 RESERVEDMEM_OF_DECLARE(qman_pfdr, "fsl,qman-pfdr", qman_pfdr);
 
+#endif
+
 static unsigned int qm_get_fqid_maxcnt(void)
 {
 	return fqd_sz / 64;
 }
 
-/*
- * Flush this memory range from data cache so that QMAN originated
- * transactions for this memory region could be marked non-coherent.
- */
-static int zero_priv_mem(struct device *dev, struct device_node *node,
-			 phys_addr_t addr, size_t sz)
-{
-	/* map as cacheable, non-guarded */
-	void __iomem *tmpp = ioremap_prot(addr, sz, 0);
-
-	if (!tmpp)
-		return -ENOMEM;
-
-	memset_io(tmpp, 0, sz);
-	flush_dcache_range((unsigned long)tmpp,
-			   (unsigned long)tmpp + sz);
-	iounmap(tmpp);
-
-	return 0;
-}
-
 static void log_edata_bits(struct device *dev, u32 bit_count)
 {
 	u32 i, j, mask = 0xffffffff;
@@ -687,11 +689,12 @@ static int qman_resource_init(struct device *dev)
 static int fsl_qman_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct device_node *node = dev->of_node;
+	struct device_node *mem_node, *node = dev->of_node;
 	struct resource *res;
 	int ret, err_irq;
 	u16 id;
 	u8 major, minor;
+	u64 size;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
@@ -727,10 +730,83 @@ static int fsl_qman_probe(struct platform_device *pdev)
 		qm_channel_caam = QMAN_CHANNEL_CAAM_REV3;
 	}
 
-	ret = zero_priv_mem(dev, node, fqd_a, fqd_sz);
-	WARN_ON(ret);
-	if (ret)
-		return -ENODEV;
+	if (fqd_a) {
+#ifdef CONFIG_PPC
+		/*
+		 * For PPC backward DT compatibility
+		 * FQD memory MUST be zero'd by software
+		 */
+		zero_priv_mem(fqd_a, fqd_sz);
+#else
+		WARN(1, "Unexpected archiceture using non shared-dma-mem reservations");
+#endif
+	} else {
+		/*
+		 * Order of memory regions is assumed as FQD followed by PFDR
+		 * in order to ensure allocations from the correct regions the
+		 * driver initializes then allocates each piece in order
+		 */
+		ret = of_reserved_mem_device_init_by_idx(dev, dev->of_node, 0);
+		if (ret) {
+			dev_err(dev, "of_reserved_mem_device_init_by_idx(0) failed 0x%x\n",
+				ret);
+			return -ENODEV;
+		}
+		mem_node = of_parse_phandle(dev->of_node, "memory-region", 0);
+		if (mem_node) {
+			ret = of_property_read_u64(mem_node, "size", &size);
+			if (ret) {
+				dev_err(dev, "FQD: of_address_to_resource fails 0x%x\n",
+					ret);
+				return -ENODEV;
+			}
+			fqd_sz = size;
+		} else {
+			dev_err(dev, "No memory-region found for FQD\n");
+			return -ENODEV;
+		}
+		if (!dma_zalloc_coherent(dev, fqd_sz, &fqd_a, 0)) {
+			dev_err(dev, "Alloc FQD memory failed\n");
+			return -ENODEV;
+		}
+
+		/*
+		 * Disassociate the FQD reserved memory area from the device
+		 * because a device can only have one DMA memory area. This
+		 * should be fine since the memory is allocated and initialized
+		 * and only ever accessed by the QMan device from now on
+		 */
+		of_reserved_mem_device_release(dev);
+	}
+	dev_dbg(dev, "Allocated FQD 0x%llx 0x%zx\n", fqd_a, fqd_sz);
+
+	if (!pfdr_a) {
+		/* Setup PFDR memory */
+		ret = of_reserved_mem_device_init_by_idx(dev, dev->of_node, 1);
+		if (ret) {
+			dev_err(dev, "of_reserved_mem_device_init(1) failed 0x%x\n",
+			ret);
+			return -ENODEV;
+		}
+		mem_node = of_parse_phandle(dev->of_node, "memory-region", 1);
+		if (mem_node) {
+			ret = of_property_read_u64(mem_node, "size", &size);
+			if (ret) {
+				dev_err(dev, "PFDR: of_address_to_resource fails 0x%x\n",
+					ret);
+				return -ENODEV;
+			}
+			pfdr_sz = size;
+		} else {
+			dev_err(dev, "No memory-region found for PFDR\n");
+			return -ENODEV;
+		}
+		if (!dma_zalloc_coherent(dev, pfdr_sz, &pfdr_a, 0)) {
+			dev_err(dev, "Alloc PFDR Failed size 0x%zx\n", pfdr_sz);
+			return -ENODEV;
+		}
+	}
+	dev_info(dev, "Allocated PFDR 0x%llx 0x%zx\n", pfdr_a, pfdr_sz);
 
 	ret = qman_init_ccsr(dev);
 	if (ret) {
diff --git a/drivers/soc/fsl/qbman/qman_priv.h b/drivers/soc/fsl/qbman/qman_priv.h
index 5fe9faf..957ef54 100644
--- a/drivers/soc/fsl/qbman/qman_priv.h
+++ b/drivers/soc/fsl/qbman/qman_priv.h
@@ -28,13 +28,13 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
 #include "dpaa_sys.h"
 
 #include <soc/fsl/qman.h>
 #include <linux/dma-mapping.h>
 #include <linux/iommu.h>
+#include <linux/dma-contiguous.h>
+#include <linux/of_address.h>
 
 #if defined(CONFIG_FSL_PAMU)
 #include <asm/fsl_pamu_stash.h>
diff --git a/drivers/soc/fsl/qbman/qman_test.h b/drivers/soc/fsl/qbman/qman_test.h
index d5f8cb2..41bdbc48 100644
--- a/drivers/soc/fsl/qbman/qman_test.h
+++ b/drivers/soc/fsl/qbman/qman_test.h
@@ -30,7 +30,5 @@
 
 #include "qman_priv.h"
 
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
 int qman_test_stash(void);
 int qman_test_api(void);
-- 
2.7.4