From 75efdee11b5da3acbbeb43a9b93a9c4fe6d5bec8 Mon Sep 17 00:00:00 2001 From: Alex Deucher Date: Mon, 4 Mar 2013 12:47:46 -0500 Subject: [PATCH] drm/radeon: implement simple doorbell page allocator The doorbell aperture is a PCI BAR whose pages can be mapped to compute resources for things like wptrs for userspace queues. This patch maps the BAR and sets up a simple allocator to allocate pages from the BAR. Signed-off-by: Alex Deucher --- drivers/gpu/drm/radeon/cik.c | 38 ++++++++++++++ drivers/gpu/drm/radeon/radeon.h | 21 ++++++++ drivers/gpu/drm/radeon/radeon_device.c | 94 ++++++++++++++++++++++++++++++++++ 3 files changed, 153 insertions(+) diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c index a61c373..a8161d0 100644 --- a/drivers/gpu/drm/radeon/cik.c +++ b/drivers/gpu/drm/radeon/cik.c @@ -121,6 +121,44 @@ u32 cik_get_xclk(struct radeon_device *rdev) return reference_clock; } +/** + * cik_mm_rdoorbell - read a doorbell dword + * + * @rdev: radeon_device pointer + * @offset: byte offset into the aperture + * + * Returns the value in the doorbell aperture at the + * requested offset (CIK). + */ +u32 cik_mm_rdoorbell(struct radeon_device *rdev, u32 offset) +{ + if (offset < rdev->doorbell.size) { + return readl(((void __iomem *)rdev->doorbell.ptr) + offset); + } else { + DRM_ERROR("reading beyond doorbell aperture: 0x%08x!\n", offset); + return 0; + } +} + +/** + * cik_mm_wdoorbell - write a doorbell dword + * + * @rdev: radeon_device pointer + * @offset: byte offset into the aperture + * @v: value to write + * + * Writes @v to the doorbell aperture at the + * requested offset (CIK). + */ +void cik_mm_wdoorbell(struct radeon_device *rdev, u32 offset, u32 v) +{ + if (offset < rdev->doorbell.size) { + writel(v, ((void __iomem *)rdev->doorbell.ptr) + offset); + } else { + DRM_ERROR("writing beyond doorbell aperture: 0x%08x!\n", offset); + } +} + #define BONAIRE_IO_MC_REGS_SIZE 36 static const u32 bonaire_io_mc_regs[BONAIRE_IO_MC_REGS_SIZE][2] = diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h index 064a579..a74d985 100644 --- a/drivers/gpu/drm/radeon/radeon.h +++ b/drivers/gpu/drm/radeon/radeon.h @@ -556,6 +556,20 @@ struct radeon_scratch { int radeon_scratch_get(struct radeon_device *rdev, uint32_t *reg); void radeon_scratch_free(struct radeon_device *rdev, uint32_t reg); +/* + * GPU doorbell structures, functions & helpers + */ +struct radeon_doorbell { + u32 num_pages; + bool free[1024]; + /* doorbell mmio */ + resource_size_t base; + resource_size_t size; + void __iomem *ptr; +}; + +int radeon_doorbell_get(struct radeon_device *rdev, u32 *page); +void radeon_doorbell_free(struct radeon_device *rdev, u32 doorbell); /* * IRQS. @@ -1710,6 +1724,7 @@ struct radeon_device { struct radeon_gart gart; struct radeon_mode_info mode_info; struct radeon_scratch scratch; + struct radeon_doorbell doorbell; struct radeon_mman mman; struct radeon_fence_driver fence_drv[RADEON_NUM_RINGS]; wait_queue_head_t fence_queue; @@ -1783,6 +1798,9 @@ void r100_mm_wreg(struct radeon_device *rdev, uint32_t reg, uint32_t v, u32 r100_io_rreg(struct radeon_device *rdev, u32 reg); void r100_io_wreg(struct radeon_device *rdev, u32 reg, u32 v); +u32 cik_mm_rdoorbell(struct radeon_device *rdev, u32 offset); +void cik_mm_wdoorbell(struct radeon_device *rdev, u32 offset, u32 v); + /* * Cast helper */ @@ -1832,6 +1850,9 @@ void r100_io_wreg(struct radeon_device *rdev, u32 reg, u32 v); #define RREG32_IO(reg) r100_io_rreg(rdev, (reg)) #define WREG32_IO(reg, v) r100_io_wreg(rdev, (reg), (v)) +#define RDOORBELL32(offset) cik_mm_rdoorbell(rdev, (offset)) +#define WDOORBELL32(offset, v) cik_mm_wdoorbell(rdev, (offset), (v)) + /* * Indirect registers accessor */ diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c index 4e97ff7..82335e3 100644 --- a/drivers/gpu/drm/radeon/radeon_device.c +++ b/drivers/gpu/drm/radeon/radeon_device.c @@ -232,6 +232,94 @@ void radeon_scratch_free(struct radeon_device *rdev, uint32_t reg) } /* + * GPU doorbell aperture helpers function. + */ +/** + * radeon_doorbell_init - Init doorbell driver information. + * + * @rdev: radeon_device pointer + * + * Init doorbell driver information (CIK) + * Returns 0 on success, error on failure. + */ +int radeon_doorbell_init(struct radeon_device *rdev) +{ + int i; + + /* doorbell bar mapping */ + rdev->doorbell.base = pci_resource_start(rdev->pdev, 2); + rdev->doorbell.size = pci_resource_len(rdev->pdev, 2); + + /* limit to 4 MB for now */ + if (rdev->doorbell.size > (4 * 1024 * 1024)) + rdev->doorbell.size = 4 * 1024 * 1024; + + rdev->doorbell.ptr = ioremap(rdev->doorbell.base, rdev->doorbell.size); + if (rdev->doorbell.ptr == NULL) { + return -ENOMEM; + } + DRM_INFO("doorbell mmio base: 0x%08X\n", (uint32_t)rdev->doorbell.base); + DRM_INFO("doorbell mmio size: %u\n", (unsigned)rdev->doorbell.size); + + rdev->doorbell.num_pages = rdev->doorbell.size / PAGE_SIZE; + + for (i = 0; i < rdev->doorbell.num_pages; i++) { + rdev->doorbell.free[i] = true; + } + return 0; +} + +/** + * radeon_doorbell_fini - Tear down doorbell driver information. + * + * @rdev: radeon_device pointer + * + * Tear down doorbell driver information (CIK) + */ +void radeon_doorbell_fini(struct radeon_device *rdev) +{ + iounmap(rdev->doorbell.ptr); + rdev->doorbell.ptr = NULL; +} + +/** + * radeon_doorbell_get - Allocate a doorbell page + * + * @rdev: radeon_device pointer + * @doorbell: doorbell page number + * + * Allocate a doorbell page for use by the driver (all asics). + * Returns 0 on success or -EINVAL on failure. + */ +int radeon_doorbell_get(struct radeon_device *rdev, u32 *doorbell) +{ + int i; + + for (i = 0; i < rdev->doorbell.num_pages; i++) { + if (rdev->doorbell.free[i]) { + rdev->doorbell.free[i] = false; + *doorbell = i; + return 0; + } + } + return -EINVAL; +} + +/** + * radeon_doorbell_free - Free a doorbell page + * + * @rdev: radeon_device pointer + * @doorbell: doorbell page number + * + * Free a doorbell page allocated for use by the driver (all asics) + */ +void radeon_doorbell_free(struct radeon_device *rdev, u32 doorbell) +{ + if (doorbell < rdev->doorbell.num_pages) + rdev->doorbell.free[doorbell] = true; +} + +/* * radeon_wb_*() * Writeback is the the method by which the the GPU updates special pages * in memory with the status of certain GPU events (fences, ring pointers, @@ -1162,6 +1250,10 @@ int radeon_device_init(struct radeon_device *rdev, DRM_INFO("register mmio base: 0x%08X\n", (uint32_t)rdev->rmmio_base); DRM_INFO("register mmio size: %u\n", (unsigned)rdev->rmmio_size); + /* doorbell bar mapping */ + if (rdev->family >= CHIP_BONAIRE) + radeon_doorbell_init(rdev); + /* io port mapping */ for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { if (pci_resource_flags(rdev->pdev, i) & IORESOURCE_IO) { @@ -1239,6 +1331,8 @@ void radeon_device_fini(struct radeon_device *rdev) rdev->rio_mem = NULL; iounmap(rdev->rmmio); rdev->rmmio = NULL; + if (rdev->family >= CHIP_BONAIRE) + radeon_doorbell_fini(rdev); radeon_debugfs_remove_files(rdev); } -- 2.7.4